Happy Groundhog day, everybody . . .

[center]The JR Chess Report and Gloat Free Scores theme music:[/center][center]Merrick, The Look Sharp, Be Sharp March (From a broadcast of The Gillette Cavalcade of Spots).[/center]

[center]

Your humble hare acknowledges the assistance of Houdini 3 x64, Rybka 4.1 x64 and Fritz 13 on analysis.

Diagrams on the Jack Rabbit Chess Report are made with Aquarium, a commercially available interface for Rybka.

Diagrams and other images are hosted on imgur.com.
[center]
BLACK



WHITE
White to move
(This position is a theoretical draw)
[/center]

I would like to thank my impressive and loyal staff: Buccaneer, Spitfire, Desperado, Swashbuckler, Pancho and Robin Hood.

[center][/center][font size="1"]Photo by Arch (http://commons.wikimedia.org/wiki/User:Arch) in Wikimedia Commons (http://en.wikipedia.org/wiki/File:Wijk_aan_zee_044.JPG)
(Public Domain)
[/font]

[center][/center]

[center]Magnus Carlsen[/center][font size="1"]Photo by Stefan64 (http://commons.wikimedia.org/wiki/User:Stefan64) from Wikipedia
(Creative Commons License, Attribution/Share Alike)
[/font]

Magnus Carlsen - Pentala Harikrishna
75th Tata Steel Tournament (Group A), Round 4
Wijk aan Zee, 15 January 2013

Epine Dorsal: Royal Defense/Saragossa Opening (Ponziani Opening)

1.e4 e5 2.Nf3 Nc6 3.c3

• There is a reason this opening, the brainchild of eighteenth century Italian master Domenico Ponziani, isn't seen too often. While one shouldn't make a habit of playing it, it is good enough to use as a surprise weapon.

• For the most usual lines of this opening, see Brochet-Ivanchuk, Euro Club Cup, Plovdiv, 2010..

• If [font color="red"]5...Nxe4 6.Nxe5 Bd7[/font] then:
• If [font color="red"]7.Nxd7 Qxd7 8.0-0 Be7 9.Nd2[/font] then:
• [font color="red"]9...Nxd2 10.Bxd2 0-0 11.a4 a6 12.Bd3 Rfe8 13.b4[/font] is equal (Camilleri-Al-Ghasra, Ol, Novi Sad, 1990).
• [font color="magenta"]9...Nd6 10.Ba4 0-0 11.Nf3 Qd8 12.Qb3 Nc4 13.Qd1[/font] gives White a slight edge in space (Popiel-Jacob, IT, Munich, 1900).
• [font color="darkred"]7.Qb3 Nxe5 8.Qxd5 Qe7 9.Qxb7? Nf3+ 10.Kf1 Ng3+[/font] White resigns facing mate (Grundy-Rankin, IT, London, 1893).

• If [font color="red"]7.cxd4 Bb4+ 8.Bd2[/font] then:
• If [font color="red"]8...Nxd2 9.Nbxd2! 0-0 10.0-0[/font] then:
• If [font color="red"]10...Bd7 11.Bd3 Bg4 12.h3 Bh5 13.Nb3[/font] then:
• [font color="red"]13...a5 14.a4 Qe7 15.Rc1 Nd8 16.g4 Bg6[/font] is equal (Brandenberg-Hanley, EU Ch, Liverpool, 2006).
• If [font color="darkred"]13...f6 14.e6[/font] then:
• [font color="darkred"]14...Re8!? 15.a3 Bf8 16.Re1 Qd6 17.Qc2[/font] gives White the small advantage space while Black has better pawns (Lavrik-Huschenbeth, EU ChU16, Sibenik, 2007).
• [font color="magenta"]14...Qe7 15.a3 Bd6 16.Re1 f5 17.Bb5 Nd8 18.Bd7[/font] gives Black an extra pawn and White more space.
• [font color="darkpink"]10...Bxd2!? 11.Qxd2! Ne7 12.Rae1 Bf5 13.Re3 c6 14.Bd3[/font] gives White a slight advantage in space (Houdini).
• [font color="darkorchid"]8...Be7 9.Nc3 0-0 10.h3 Bd7 11.Bxc6 Bxc6 12.Qb3[/font] is equal (Houdini).

• Black accepts doubled pawns; this will be a strategic point in White's favor for some time.
• [font color="red"]8...Bxc6 9.0-0 Be7 10.f3 Nc5 11.f4[/font] gives White a slight advantage (L. A. Schneider-Moen, Op, Eksjo, 1981),

• If [font color="red"]9...c5 10.Nb3 Bb5 11.Re1[/font] then:
• [font color="red"]11...Be7?! 12.f3! Ng5 13.Bxg5 Bxg5 14.Nxc5 Bh4 15.g3[/font] leaves White with an extra pawn (Velimirovic-Ostojic, Op, Belgrade, 1993).
• [font color="darkred"]11...c4 12.Nd4 Bd7 13.b3 cxb3 14.axb3 Qc8 15.c4[/font] gives White an extra pawn; Black is slightly ahead in development(Houdini).

• White has better pawns and a slight edge in space.

• Black neglects the need to establish a broader pawn center.
• If [font color="red"]11...c5 12.Ne2 Bb5 13.Re1 Nxd2 14.Qxd2 a5 15.Ng3[/font] still leaves White slightly better.

• White just drives the Knight away.
• [font color="red"]12.Qc2 Nb7 13.Ne2 c5 14.h3 Bb5 15.c4[/font] gives White a slight advantage in space and stronger pawns.

• The Knight seems offsided here, but can make a trek to either e6 after moving his Queen or just the jump to d6 if White's e-pawn advances.
• [font color="red"]12...Ne6 13.N2b3 Nxd4 14.Bxd4 Qc8 15.Re1 Re8 16.Bc5[/font] also gives White the advantage in space and stronger pawns; as in the game, White will restrain and blockade the doubled c-pawns.


• [font color="blue"]12...Nd3!? 13.f4! c5[/font] (the point of Black's twelfth move; Black has no intention of stranding the Knight at d3) [font color="blue"]14.bxc5 Nxc5 15.Qf3 c6 16.c4[/font] gives White a fair advantage in space.

• Black's queenside pawns are more moble than White's; White should shore up his queenside before undertaking aggressive action elsewhere.
• [font color="red"]13.Qb3 h6 14.Rfd1 a5 15.a3 Bg5 16.f4[/font] continues to give White a small advantage.

• Black proposes a pawn exchange that frees his Rook.

• White continues with his kingside initiative. Black maintains an aggressive posture on the opposite wing.
• [font color="red"]14.a3 axb4 15.axb4 c5 16.bxc5 Rxa1 17.Qxa1 Bxc5[/font] continues to give White a slight advantage.

• Having come this far with his plan of kingside aggression, White might just as well continue to play there.
• [font color="red"]15.Qg4 bxc3 16.Bh6 Bf6 17.exf6 Qxf6 18.Bg5 Qd6[/font] remains equal.

• Black frees his queenside pieces and wins a pawn.

• White returns to his kingside campaign.

• Now it's Black turn to be overagressive on a wing while the other burns.
• If [font color="red"]16...Qe8 17.N2f3 f6 18.e6[/font] then:
• [font color="red"]18...c5 19.Nc2 Ba5 20.Bh6 Qe7 21.exd7 Qxd7[/font] gives Black two extra pawns and White pressure on the kingside.
• If [font color="darkred"]18...Qe7 19.exd7 Qxe3+ 20.Kh1 Qe4[/font] then:
• [font color="darkred"]21.Qh3 Nc5 22.Ne6 Nxe6 23.fxe6 Ra3 24.Rac1 Re3[/font] leaves White unable to capitalize on his advanced passers.
If [font color="magenta"]21.Qxe4!? dxe4 22.Nxc6 Bc5![/font] then:
• [font color="magenta"]23.Nd2 Ra6 24.d8Q Nxd8 25.Nxd8 Rxd8 26.Nxe4 Bb6 [/font] gives Black an extra pawn and more active Rooks.
• [font color="darkorange"]23.Rfb1 Nd8 24.Rb5 Bb6 25.Nfd4 Bxd4 26.Nxd4 Rf7[/font] White's advanced pawn is deadwood.
• [font color="blue"]16...f6 17.Ne6 Bxe6 18.Qxb4 Bc8 19.e6 Nd6[/font] is equal; Black's queenside passers are easly blockaded, rendering Black's extra pawn useless.

[center]BLACK: Pentala Harikrishna[/center]

[center][/center]

[center]WHITE: Magnus Carlsen[/center][center]Position after 16...Bb4c3[/center]

• The game is equal.
• [font color="red"]17.Rab1 c5 18.Rxb7 Bxd4 19.Bxd4 Ra4 20.Qg3 Rxd4[/font] remains equal.

• Black succumbs to the temptation to grab a loose pawn, neglecting the possible advance of White's center pawns.
• [font color="red"]18...c5 19.e6 cxd4 20.f6 g6 21.Qf4 fxe6 22.f7+[/font] remains equal.

• The e-pawn advanced with tempo.
• The Saragossa Opening has a reputation of being solid and slow, but the two players have managed to bring a sharp middlegame out of it.

• Black must deal before all else with the threatened mate at g7.

• White gets his Knight out of harm's way and probably intends to place it at c5, but this move creates no threat in itself.
• Better is [font color="red"]20.Rce1[/font] (threatening the crushing 21.e7!) when:
• If [font color="red"]20...Rxd2 21.e7[/font] then:
• If [font color="red"]21...Qa8 22.Ra1[/font] then:
• [font color="red"]22...Ra2 23.exf8Q+ Kxf8 24.Qh5 Rxa1 25.Rxa1 Qd8 26.Qxh7[/font] gives White a slight advantage; he emerges from the complications with more activity while Black has two pawns for the exchange.
• If [font color="burgundy"]22...Kf7??[/font] then Black is toast after [font color="burgundy"]23.Rfe1! Qe8 24.exf8Q+ Qxf8 25.Ra7 Nd6 26.Bc5.[/font]
• [font color="darkpink"]21...Qe8 22.exf8Q+ Qxf8 23.Qf4 Rd3 24.Qxc7 Qd6 25.Bb6[/font] gives White a slight advantage after the exchange of queens.
• If [font color="darkred"]20...Qe7?! 21.exd7 Qxd7 22.Nb3[/font] then:
• [font color="darkred"]22...Nd6 23.Re6 Kh8 24.Rfe1 Qc8 25.Bc5 Rg8 26.Nc1[/font] gives White a Bishop and a powerful position for three pawns.
• If [font color="magenta"]22...Ra4 23.Rf3[/font] then:
• If [font color="magenta"]23...c5 24.Rfe3 Rxd4 25.Nxd4[/font] then:
• [font color="magenta"]25...Qa4 26.Qf3 Qxd4 27.Rd1 Qc4 28.Qxd5+[/font] gives White a pair of active Rooks after the exchange.
• If [font color="darkorange"]25...h5??[/font] then:
• White wins after [font color="darkorange"]26.Qg6! Nd6 27.Re7[/font] when:
• [font color="darkorange"]27...Rf7 28.Rxd7 Rxd7 29.Re8+ Nxe8 30.Qxe8+ Kh7 31.Ne6[/font] leads to mate.
• If [font color="hotpink"]27...Qxe7[/font] then after [font color="hotpink"]28.Rxe7 Rf7 29.Rxf7 Nxf7 30.Ne6[/font] White mates on the next move.
• White also wins after [font color="purple"]26.Qxh5 cxd4 27.Re7 Qxe7 28.Rxe7.[/font]
• If [font color="darkorange"]23...Re8 24.Re6[/font] then:
• [font color="darkorange"]24...Rb4 25.Qg3 Rxe6 26.fxe6 Qxe6 27.Bxf6[/font] leaves White threatening mate and holding a Bishop for three pawns.
• If [font color="purple"]24...c5 25.Qh5[/font] then:
• [font color="purple"]25...Raa8 26.Bxc5 Nxc5 27.Nxc5 Qb5 28.Rxe8+ Rxe8 29.Ne6[/font] gives White a Knight and a promising kingside attack for two pawns.
• If [font color="hotpink"]25...Rxe6?[/font] then White wins after [font color="hotpink"]26.fxe6 Qxe6 27.Re3 g6 28.Qe2 Qd6 29.Re8+.[/font]
• [font color="blue"]20.exd7 Rxd2 21.Rxc6 Qxd7 22.Rxf6 Rxf6 23.Bxf6 Ra2[/font] is equal.

• My staff and I disagree with Houdini, which calls this a small advantage for Black, presumably because of Black's two extra pawns and the Rook on the seventh rank. However, Black has serious mobility problems. The Bishop cannot move. White has control of c5, so the pawn that hems in the Bishop cannot move. Since White can easily gain a dark square grip, the Queen cannot move too far from the hindmost c-pawn.

[center]BLACK: Pentala Harikrishna[/center]

[center][/center]

[center]WHITE: Magnus Carlsen[/center][center]Position after 20...Bd7f8[/center]

• White attacks the Knight.

• Now that White has advanced the e-pawn, the Knight can find a comfortable post at d6.
• If [font color="red"]21...Na5[/font] then:
• [font color="red"]22.Rce1![/font] then:
• [font color="red"]22...Qe7 23.Ra1 h5 24.Qg3 Rxa1 25.Rxa1 Nc4 26.Na6[/font] gives White a small advantage with his annoying passer at e6.
• If [font color="darkred"]22...h5? 23.Qxg7+!! Kxg7 24.e7[/font] then:
• [font color="darkred"]24...Bf7 25.exd8Q Rxd8 26.Re7 Rb8 Rxc7[/font] wins at least a pawn.
• [font color="magenta"]24...Qxe7[/font] then White wins after [font color="magenta"]25.Rxe7+ Bf7 26.Rf3 Kh6 27.Nd7 Nb3 28.Be3+.[/font]
• If [font color="darkred"]22.Ra1!? Rxa1 23.Rxa1 Nc4! 24.Na6[/font] then:
• [font color="darkred"]24...Kh8 25.Bc5 Rg8 26.Qf4 Ne5 27.Bd4 Qd6 28.Bc5[/font] is equal.
• [font color="magenta"]24...h5[/font] then White wins after [font color="magenta"]25.Qg3 Nd6 26.Bc5 Kh7 27.Rb1 Rg8 28.Rb8.[/font]

• Correct is to harrass the Rook, Black's most active piece.
• [font color="red"]22.Ra1![/font] then:
• [font color="red"]22...Rd2 23.Nb3 Rd3 24.Rfb1 Qe7 25.Bc5 Kh8 26.Na5[/font] threatens giving the Rook to c3 where it will become a desperado after 28.Bb4.
• If [font color="darkred"]22...Rc2 23.Rfc1[/font] then:
• [font color="darkred"]23...Rxc1+ 24.Rxc1 Kh8 25.Rc3 h6 26.Rg3 Rg8 27.Rb3[/font] gives White an array of active pieces and a considerable advantage in space in compensation for two pawns.
• [font color="magenta"]23...Rc4 24.Rxc4 Nxc4 25.Na6 Kh8 26.Bc5 Rg8 27.Qf4[/font] gives White a huge advantage in space for two pawns.

• Black is back in the game, but with an uphill struggle. White has more pieces that are active and a strong blockade
• [font color="red"]22...Qb8 23.Rb1 Nb5 24.Qe3[/font] then:
• [font color="red"]24...Kh8 25.Qd3 Qc8 26.Ra1 Rxa1 27.Rxa1 Rg8[/font] gives Black a small advantage in space.
• [font color="darkred"]24...Qa8!? 25.Ra1 Rxa1 26.Rxa1 Qc8 27.g4 Kh8[/font] gives White only a small advantage with a passed pawn and a strong blockade of Black's queenside.

• White appears to be entertaining ideas of an exchange sacrifice on c5, but it doesn't appear to gain him anything.
• If [font color="red"]23...Ra8! 24.Rb2 Nc4 25.Rb7 Nd6 26.Rb3 Nb5[/font] gives Black the initiative and two extra pawns; White still has the advantage in space, but it no longer compensates for the material deficit.

• The game is equal.

• Black gives White time to move his Queen to a beter square.
• If [font color="red"]25...g6 26.Rfc2 Rxc5 27.Nxc5 Nxf5 28.Rb2 Nd4 29.Qf2[/font] remains equal.

• White has a small advantage in space. At its new post, the Queen discourages the advance to g6 in order to undermine the White e-pawn by applying more pressure to f6, which would be weakened by the advance.

• Black blocks the retreat of the Bishop and loosens the blockade on White dangerous e-pawn.
• If [font color="red"]26...Be8 [/font] then:
• If [font color="red"]27.Nd4![/font] then:
• If [font color="red"]27...Rb8![/font] then:
• If [font color="red"]28.Qa3 Qd8 29.Rfc2[/font] then:
• If [font color="red"]29...Kh8[/font] then:
• If [font color="red"]30.Nxc6 Bxc6 31.Bxd6 Qxd6 32.Qxd6 cxd6 33.Rxc6[/font] then:
• [font color="red"]33...g6 34.Rxd6 gxf5 35.Rxd5 Rfe8 36.Rxf5 Rxe6[/font] is equal.
• [font color="burgundy"]33...Rfe8 34.Rxd6 g6[/font] is equal.
• If [font color="darkred"]30.Bxd6 Qxd6 31.Qxd6 cxd6 32.Nxc6 Bxc6 33.Rxc6[/font] then:
• [font color="darkred"]33...g6 34.Rxd6 gxf5 35.Rxd5 Rfe8 36.Rxf5 Rxe6[/font] is equal.
• If [font color="magenta"]33...Rfe8 34.Rd1 g6 35.Rxd6 Rbd8[/font] then:
• [font color="magenta"]36.R1xd5 Rxd6 37.Rxd6 gxf5 38.Rd5 Rxe6 39.Rxf5[/font] is equal.
• [font color="darkorange"]36.Rxd8 Rxd8 37.g4 d4 38.Kf2 gxf5 39.gxf5 Kg7[/font] is equal.
• If [font color="darkred"]29...g6? 30.Re1[/font] then:
• [font color="darkred"]30...Qc8 31.fxg6 hxg6 32.Bxd6 cxd6 33.Qg3 g5 34.Nf5[/font] gains firm control over the threshold square e7.
• If [font color="magenta"]30...Qe7[/font] then White wins after [font color="magenta"]31.Qa7 Rc8 32.Bxd6 Qxd6 33.Qb7 Rd8 34.e7.[/font]
• If [font color="darkred"]28.Ra2[/font] then:
• [font color="darkred"]28...Kh8 29.Ra6 g6 30.fxg6 hxg6 31.Qg3 Rg8 32.Nxc6 Bxc6 33.Rxc6[/font] gives White a small advantage.
• If [font color="magenta"]28...Rb7 29.Ra6 g6 30.Qf3[/font] then:
• [font color="magenta"]30...Kg7 31.h3 Kh8 32.Nxc6 Bxc6 33.Rxc6[/font] then:
• [font color="darkorange"]33...Re8 34.Qxd5 Qg7 35.fxg6 Qxg6 36.Bxd6 cxd6 37.Rc8[/font] gives White a clear advantage with the advanced passer, but it clearly isn't a win.
• If [font color="darkorange"]30...Kh8 31.Nxc6 Qg7 32.Nb4 Rb8 33.Nxd5[/font] then:
• If [font color="darkorange"]33...gxf5 34.Rxd6 cxd6 35.Bxd6 Ba4 36.Bxb8 Rxb8 37.e7![/font] the passed pawn becomes a lethal weapon that gives Black victory.
• After [font color="purple"]33...d4 34.Qd5 Rd8 35.fxg6 hxg6 36.Rf1 Kh7 37.Qxd4[/font] gives White more freedom and space.
• [font color="hotpink"]33...Qh6 34.Rd1 Bb5 35.Nxc7 Bxa6 36.Nxa6 Rbc8 37.Bxd6[/font] gives White two minor pieces and a passed pawn for a Rook; the outcome is clear.
• [font color="burgundy"]27...Rb7?! 28.Qa5 Rb8 29.Rfc2 Kh8 30.Qa7[/font] gives White, who is two pawns down, a protected passed pawn at e6, a strong blockadeon Black queenside pawns and an attack on a loose piece.
• If [font color="darkred"]27.Rfc2[/font] then:
• If [font color="darkred"]27...Rb8 28.Nd4 Kh8 29.Qa5[/font] then:
• If [font color="darkred"]29...g6 30.Qa7 Rc8[/font] then:
• [font color="darkred"]31.Bb4 gxf5 32.Nxf5 Qxe6 33.Bxd6 Rf7 34.Qf2[/font] gives White a pieces for three pawns and active minor pieces; they make their escape after 35.Nh6 and 37.Bb4.
• If [font color="magenta"]31.Bxd6 Qxd6 32.Qb7 Rd8[/font] then:
• If [font color="magenta"]33.Nxc6 Bxc6 34.Rxc6 Rb8[/font] then:
• [font color="magenta"]35.Qxc7 Qxc7 36.Rxc7 gxf5 37.Rd7 Rfe8 38.Rxd5 Rxe6 39.Rxf5[/font] is equal.
• If [font color="darkorange"]35.Rxd6 Rxb7 36.Rxd5 Re8[/font] then:
• [font color="darkorange"]37.g4 Kg7 38.h3 Kh6 39.Rdc5 Rb2 40.Kh1[/font] the protected passed pawn gives White a small advantage.
• After [font color="purple"]37.Rd7 gxf5 38.Rc6 h5 39.Rf7 Rb1+ 40.Kf2[/font] White's active Rooks give him a slight advantage.
• If [font color="#C08000"]33.Re1?! Rg8 34.Nxc6 Bxc6 35.Rxc6 Qf4 36.Rxc7[/font] gives White a slight advantage after 36...Qh4.
• If [font color="darkpink"]29...Qd8?[/font] then White wins after [font color="darkpink"]30.Qa7! Rb7 31.Qxb7 Nxb7 32.e7!.[/font]
• After [font color="darkorchid"]27...Rb7 28.Nd4 Qd8 29.Qa3 g6 30.Qa6 Qb8 31.Qa1[/font] the protected passer and the queenside blockade give White a fair advantage.

• White apparently intends to push the e-pawn backed by the Queen, but Black can easily thwart this plan.
• If [font color="red"]27.Nd4! Ne4 28.Nxb5 Nxc3[/font] then:
• If [font color="red"]29.e7! Rf7 30.Nxc7[/font] then:
• [font color="red"]30...Qxe7! 31.Bxe7 Rxe7 32.Rxc3 Rxc7[/font] gives White a small advantage with active Rooks; Black has two pawns for the exchange.
• If [font color="magenta"]30...Qc8?[/font] drops a piece to [font color="magenta"]31.e8Q+!! Qxe8 32.Nxe8 Ne2+ 33.Rxe2 Bxe2 34.Nd6.[/font]
• [font color="darkred"]29.Nxc3!? Qc8 30.Bxf8 Kxf8[/font] gives Black a Queen and two pawns for two Rooks; Black is prepared to blockade White's passer with his King.

• Black ignores the threat and activates the Queen.
• If [font color="red"]27...Ne4!? 28.Bxf8[/font] then:
• If [font color="red"]28...Nxf2 29.Nd431.Bxe7 Rxe7 32.Rxc3 Rxc7[/font] then:
• [font color="red"]29...Ng4 30.Qg3 Rb2 31.Ba3 Rb7 32.Nxc6 Nh6 33.Qd3[/font] gives White more freedom and space.
• If [font color="magenta"]29...Rb2!?[/font] then after [font color="magenta"]30.Ba3! Ng4 31.Qc3 Ra2 32.Qb3[/font] White wins at least a pawn.
• If [font color="darkred"]28...Qxf8?![/font] then after [font color="darkred"]29.Ra2! c5 30.Rca1 c4 31.Nd4 Rb6 32.Qf4[/font] White has theats against the back rank and the hindmost c-pawn.

• White has a slight advantage in space.

• Black sacrifices the c-pawn in order to win the exchange.
• [font color="red"]29...Nc4 30.Qf4 Qa1+ 31.Rf1 Qa7 32.Rxc6 Rc8 33.e7[/font] continues to gives White an annoying but no longer particularly dangerous passed pawn; Black has only a pawn for the exchange.

[center]BLACK: Pentala Harikrishna[/center]

[center][/center]

[center]WHITE: Magnus Carlsen[/center][center]Position after 29...Nd6e4[/center]

• For the exchange, White gets more space and mobility.

• Black cannot stop White from advancing the pawn to e7 at will. The Rook could be used for better things.
• If [font color="red"]32...Ra8![/font] (threatening 33...Ra3! then:
• [font color="red"]33.Ne7+ Kh8 34.Nxd5 c6 35.Nc3 Qa6 36.Ne4[/font] gives White only a small advantage as the passed pawn must queen on a light square covered by the Bishop and Rook.
• [font color="darkred"]33.Rxd5!? Be8 34.Ne7+ Kh8 35.Rd3 Qa5 36.Qd2 Qb5[/font] is equal.

• Black's Bishop has no effective moves.

• [font color="red"]33...Bd1 34.Nb4 Qb3 35.Nxd5 c6 36.Qxb3 Bxb3 37.Nc7[/font] gives White a huge advantage from the activity of his pieces.

• [font color="red"]36.Nd4 c6 37.Rd7 Qb6 38.Kh2 Qb8+ 39.Qg3[/font] gives White excellent winning chances.

• The position calls for restricting the movement of White's pieces. This gives them too free of a hand to rush in and assist the passer.
• If [font color="red"]37...c6[/font] then:
• [font color="red"]38.Rd7 Qb8+ 39.Kf3 Qa8 40.Nc2 h5 41.Qa7[/font] forces the exchange of Queens and leaves White with greater; the White King will soon come into the action.
• Also good is [font color="darkred"]38.Rd6[/font] when [font color="darkred"]38...g6 39.Rd7 Qb8+ 40.Kf3 h5 41.Qd6[/font] is still an uphill struggle for Black.

[center]BLACK: Pentala Harikrishna[/center]

[center][/center]

[center]WHITE: Magnus Carlsen[/center][center]Position after 37...Bb5a4[/center]

• White's objective is still to queen the e-pawn.

• This is tantamount to surrender. Black has no defense and abandons the position to see if harrassing the White King or other weak points will rattle Magnus.
• If [font color="red"]38...Qb6 39.Qxc7 Qxc7+ 40.Rxc7[/font] then:
• If [font color="red"]40...Ra8 41.Nd5[/font] then:
• If [font color="red"]41...Be8 42.Nb6 Rd8 43.Kf4[/font] then:
• If [font color="red"]43...Rd4+ 44.Ke3 Rd8 45.Ke4[/font] then:
• [font color="red"]45...h6 46.Nd7 Bxd7 47.Rxd7 Rb8 48.g4 Kf8 49.Ra7[/font] White brings up the King to assist the pawn and wins.
• If [font color="darkred"]45...Bb5 46.g4[/font] then:
• [font color="darkred"]46...Bd3+ 47.Kf4 Ba6 48.Nd7 Bb5 49.h4 Bxd7 50.Rxd7[/font] is an easy win.
• If [font color="magenta"]46...h6 47.Nd7[/font] then:
• [font color="magenta"]47...Bxd7 48.Rxd7 Rc8 49.Kd5 Rb8 50.Kd6 Kf8 51.Rf7+ Ke8 52.Rxg7[/font] leaves Black hopeless.
• If [font color="darkorange"]47...Ba4 48.Kd5 Re8 49.Kd6[/font] then:
• If [font color="darkorange"]49...Ra8 50.Nb6 Rd8+[/font] then:
• If [font color="darkorange"]51.Ke7 Re8+ 52.Kd6[/font] then:
• [font color="darkorange"]52...Bb5 53.Rc8 Rxc8 54.Nxc8 Ba4 55.Ne7+ Kf8 56.Nc6[/font] leaves Black defensless.
• If [font color="burgundy"]52...Rd8+[/font] then White wins after [font color="burgundy"]53.Rd7 Bxd7 54.exd7.[/font]
• White also wins after [font color="hotpink"]51.Rd7 Bxd7 52.exd7 h5 53.Ke7 Rb8 54.Nc8.[/font]
• If [font color="purple"]49...Bb3[/font] then White wins after [font color="purple"]50.Nc5 Bd1 51.Rd7 Kf8 52.e7+.[/font]
• If [font color="burgundy"]43...Rb8[/font] then White wins after [font color="burgundy"]44.Nd7 Rd8 45.Ke4 Bxd7 46.Rxd7.[/font]
• If [font color="darkpink"]41...Rd8[/font] then White wins after [font color="darkpink"]42.Nb6 Bb5 43.Nd7 Bxd7 44.Rxd7 Ra8 45.Kf4.[/font]
• If [font color="darkred"]40...Rd8[/font] then:
• If [font color="darkred"]41.Na6 Be8 42.Nc5[/font] then:
• [font color="darkred"]42...Ra8 43.Nd7 Rd8 44.Kf4 Bxd7 45.Rxd7 Rc8 46.g4[/font] the King approaches to escort the pawn home.
• If [font color="burgundy"]42...Rb8[/font] then White wins after [font color="burgundy"]43.Nd7 Ra8 44.Kf4 Rd8 45.g4 h5 46.g5.[/font]
• If [font color="magenta"]41.Kf4[/font] then:
• [font color="magenta"]41...Be8 42.Na6 Ra8 43.Nc5 Kf8 44.g4 Ra3 45.Ne4[/font] White threatens 44.Nd6 and wins whether Black takes the pawn or not.
• If [font color="darkorange"]41...Bb5[/font] then White wins after [font color="darkorange"]42.Nd5 Be8 43.Nb6 Rd4+ 44.Ke3 Rd8 45.Ke4.[/font]

• White overlooks [font color="red"]39.Qxc7 Qxb4 40.Rxg7+ Kh8 41.Rxh7+ Kg8 42.Qg7#.[/font]

• If [font color="red"]39...Kh8 40.Ra7[/font] then:
• If [font color="red"]40...Bd1[/font] then White wins after [font color="red"]41.Qc7 Rg8 42.Qf4 Bc2 43.Nxc2 Qxc2 44.Rd7.[/font]
• If [font color="darkred"]40...Bb3[/font] then White wins after [font color="darkred"]41.Qc7 Rg8 42.Qf4 Bd5 43.Nxd5 Qxd5 44.Rd7.[/font]

• White makes an inaccurate move that could cost him dearly.
• If [font color="red"]42.Qf3![/font] then:
• If [font color="red"]42...Qe5+ 43.g3[/font] then:
• If [font color="red"]43...Be8 44.Rc2 h4 45.Nd5[/font] then:
• If [font color="red"]45...hxg3+ 46.Kg2 Rf8 47.h4[/font] then:
• If [font color="red"]47...Rg8[/font] then after [font color="red"]48.Rc7 Kh6 49.Qe3+ Qxe3 50.Nxe3 Bh5 51.e7[/font] White wins by bringing the Knight to d6 via c4, covering the promotion square.
• If [font color="burgundy"]47...Kh6[/font] then Black wins after [font color="burgundy"]48.e7 Rh8 49.Qe3+ Qxe3 50.Nxe3 Ba4 51.Rd2.[/font]
• If [font color="darkred"]45...g5 46.Ne3[/font] then:
• If [font color="darkred"]46...Qd6[/font] then White wins after [font color="darkred"]47.Ng4 Rf8 48.Kg2 Kg8 49.gxh4 gxh4 50.Nf2.[/font]
• If [font color="magenta"]46...hxg3+[/font] then White wins after [font color="magenta"]47.Kg2 Rf8 48.Ng4 Qb5 49.Kxg3 Qb1 50.Rc8.[/font]
• If [font color="darkpink"]43...Qxc7??[/font] then [font color="darkpink"]44.Qxh5#.[/font]
• If [font color="darkorchid"]42...Qxb4??[/font] then [font color="darkorchid"]43.Qxh5#.[/font]

• Black misses a big chance to get back in the game.
• [font color="red"]42...Bb5! 43.Nc5 Qe5+ 44.Qg3 Qxf5 45.e7 Qd5 46.Nb7[/font] leaves White with a clear advantage in the passed pawn, but it's promotion is not a slam dunk.

[center]BLACK: Pentala Harikrishna[/center]

[center][/center]

[center]WHITE: Magnus Carlsen[/center][center]Position after 42...Ba4e8[/center]

• If [font color="red"]45...Rf8[/font] then White wins after [font color="red"]46.Nc2 Ba4 47.Qd4 Qb6 48.Qb4 Qd6 49.Rc4[/font] when Black cannot both stop the pawn and save all of his pieces.

• Somewhat more stubborn is [font color="red"]46...Qd2 47.Nd5 Ba4 48.Qc1 Qd4 49.Qc3 Qxc3 50.Rxc3.[/font]

• White has an easy win after [font color="red"]50.Nxf6 Qe7 51.Rxf8+ Qxf8 52.Nxh5 Qe7 53.f6.[/font]
• Sri Harikrishna resigns.

Last edited Thu Feb 21, 2013, 02:19 PM - Edit history (2)

Herr Niaditsch surpassed Rapport Ur to grab the lead in Group B with this late-round victory. It is a good example of planning and execution.

[center][/center]

[center]Arkadij Naiditsch[/center][font size="1"]Photo by Pawel Suwarski in Wikipedia (http://en.wikipedia.org/wiki/File:Naiditsch_Arkadij.jpg)
(Public Domain)[/font]

Arkadij Naiditsch - Richard Rapport
75th Tata Steel International Tournament (Group B), Round 11
Wijk aan Zee, 25 January 2013

French Exchange Game: Nimzo-Winawer Defense

1.e4 e6 2.d4 d5 3.Nc3 Bb4

• For a more thorough survey of the Nimzo-Winawer Defense, see Pogrebyssky-Botvinnik, Soviet Ch, Leningrad, 1939.

• If [font color="red"]5...Nc6 6.Nge2 Nge7 7.Ng3 Bf5 8.0-0[/font] then:
• If [font color="red"]8...Bxd3 9.Qxd3 Qd7 10.Nce2 0-0[/font] then:
• [font color="red"]11.c3 11...Bd6 12.Bf4 Rae8 13.Qf3 Nd8[/font] is equal (Spielmann-Dr. Euwe, IT, Zandvoort, 1936).
• [font color="magenta"]11.b3 Bd6 12.f4 f5 13.c4 b6 14.Bb2 Nd8[/font] is equal (Spielmann-Sämisch, IT, Wiesbaden, 1925).
• [font color="darkred"]8...Bg6 9.Nce2 Qd7 10.f4 f5 11.a3 Bd6 12.b3[/font] is equal (Spielmann-Nimzovich, IT, Copenhagen, 1923).

• The players are already out of the book and it's way too soon to make a determination of who's better.

• [font color="red"]6...Nf6 7.h3 Bd6 8.0-0 0-0 9.Bf4 Bxf4 10.Nxf4[/font] gives White the lead in development and the better Bishop.

• [font color="red"]9.Bg5 Bxc3 10.bxc3 f6 11.Bf4 Rf7 12.c4 dxc4 13.Bxc4[/font] gives White more space and Black better pawns.

• In the main line of the Nimzo-Winawer, Black exchanges his dark-bound Bishop for the Knight at c3. However, there is no point to that unless Black inflicts structural damage by making White double his c-pawn in recapturing.

• If [font color="red"]10...Ng6 11.a4[/font] then:
• [font color="red"]11...h6 (11...Qc7 12.Be3 Re8 13.Bxg6 fxg6 14.Bf4 Nf8 15.Qd2[/font] is equal.
• [font color="darkred"]12.Be3 Re8 13.Bxg6 hxg6 14.Qd2 a5 15.Bf4[/font] is equal.

• If [font color="red"]11.Bf4[/font] then:
• If [font color="red"]11...Nf8 12.Qd2[/font] then:
• [font color="red"]12...Be6 13.Bxd6 Qxd6 14.Nf4 h6 15.h3[/font] leaves White slightly better.
• [font color="burgundy"]12...Neg6 13.Bxg6 hxg6 14.Bxd6 Qxd6 15.Nf4) 13.Bxd6 Qxd6 14.Nf4 h6 15.h3[/font] leaves White slightly better.
• If [font color="darkred"]11...Bb4!? 12.c3! Ba5[/font] then:
• [font color="darkred"]13.Bg5 f6 14.Nf4 Nf8 15.Bxf6 gxf6 16.Nfh5[/font] gives White a clear advantage with an extra pawn and an aggressive Knight.
• [font color="magenta"]13.Qd2 Kh8 14.Nf1 Nf8 15.Neg3 Bc7 16.Nh5[/font] gives White a small advantage.

• [font color="red"]11...Qc7 12.Bg5 Nf8 13.Qd2 f6 14.Bf4 Neg6[/font] is equal.

• The game is equal.
• [font color="red"]12.Bf4 b6 13.Qd2 Neg6 14.Bxd6 Qxd6 15.Bxg6 hxg6[/font] is equal.

• If [font color="red"]13.Qc1 a5 14.a4 Bd7 15.c3 Qc7 16.Qc2 Nf8[/font] is equal
• [font color="darkred"]13...Bxh3[/font] now fails against [font color="darkred"]14.gxh3 Nh4 15.Kh1 Nf3 16.Rf1 Qc8.[/font]

• Black misses an opportunity to inflict structural damage on Wite's kingside.
• [font color="red"]13...Bxh3!! 14.gxh3 Nh4 15.Kh1 Nf3 16.Qc3 Nxe1[/font] gives Black the exchange against White's spatial plus.

• White voluntarily parts with his good Bishop.
• If [font color="red"]15.Bg5 f6 16.Nef4[/font] then:
• If [font color="red"]16...Bd7 17.Nxg6[/font] then:
• [font color="red"]17...hxg6 18.Bxf5 Rxe1+ 19.Rxe1 Bxf5 20.Bxf6 gxf6 21.Re8+[/font] gives an asymmetical material balance after 21...Qxe8 22.Nxf6+ Kg7 23.Nxe8+ Rxe8 when Houdini evaluates the position as equal.
• [font color="burgundy"]17...Rxe1+ 18.Rxe1 hxg6 19.Bxf5 Bxf5 20.Bxf6 gxf6 21.Re8+[/font] is equal.
• If [font color="darkred"]16...Nxf4[/font] then:
• If [font color="darkred"]17.Bxf4[/font] then:
• If [font color="darkred"]17...Nxd4 18.Bxd6 Qxd6 19.Bxh7+ Kxh7 20.Qxd4 Bf5 21.c3[/font] is equal.
• [font color="burgundy"]17...Bxf4?! 18.Qxf4! Qd7 19.Qg4 Kh8 20.Rxe6 Qxe6 21.Nf4[/font] drops the Knight, leaving White with two minor pieces for a Rook.
• If [font color="magenta"]17.Nxf4!? Bd7[/font] then:
• If [font color="magenta"]18.Bxf5 18...Bxf5 19.Bh4 g5 20.Nh5 Rxe1+ 21.Rxe1 gxh4[/font] then:
• [font color="magenta"]22.Re8+ Qxe8 23.Nxf6+ Kf7 24.Nxe8 Rxe8 25.c3 Bg6[/font] gives Black a material advantage, two Bishop on an open field and command of the the open file; White has a stronger pawn structure and a safer King.
• If [font color="purple"]22.Qh6?[/font] then Black wins after [font color="purple"]22...Qf8! 23.Nxf6+ Kh8 24.Ng4 Qxh6 25.Nxh6 Bg6 when he is a piece to the good.[/font]
• [font color="darkorange"]18.Rxe8+?[/font] drops a piece to [font color="darkorange"]18...Qxe8 19.Re1 Qf8 20.Bxf5 Bxf5 21.Bh4 g5.[/font]

[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Arkadij Naiditsch[/center][center]Position after 15.Bd3f5:N[/center]

• Black gladly takes White's good Bishop; Black has a slight advantage.

• If [font color="red"]18...Nh4 19.Qc3 Qc7 20.Bc1[/font] then:
• [font color="red"]20...Kh8 21.a3 Rac8 22.Qd3 Rxe2 23.Qxe2 Rg8[/font] continues to give Black a slight advantage with a good Bishop.
• If [font color="darkred"]20...Rxe2[/font] then:
• [font color="darkred"]21.Rxe2 Re8 22.Qd3 Rxe2 23.Qxe2 Kf7 24.Nf1 Nf5[/font] gives Black a good Bishop and slightly more space.
• [font color="magenta"]21.Nxe2 Qb6 22.Nef4 Qb4 23.Qxb4 Bxb4 24.Re2 Bd6[/font] continues to give Black a good Bishop; White has a slight advantage in space.

• This would be a better idea if White were forced to recapture with the f-pawn.
• [font color="red"]21...Rxe2 22.Rxe2 Rxe2 23.Qxe2 b6 24.cxd5 cxd5 25.b3[/font] continues to give Black a slight advantage with a good Bishop; each side has an isolated d-pawn.

[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Arkadij Naiditsch[/center][center]Position after 21...Bd6g3:N[/center]

• Both sides now have bad Bishops; the game remains equal.

• [font color="red"]24...dxc4 25.Qxc4+ Kh8 26.b3 Qd6 27.Qb4 Qxb4 28.Bxb4[/font] remains equal.

• This is definitely the best way to handle the pawns, even if it doesn't help White's Bishop.
• If [font color="red"]25.cxd5[/font] then:
• If [font color="red"]25...Bxd5 26.Qe3 Qd8 27.b3 b6 28.Qg3 Kh8 29.Nf4 [/font] is equal; White has an isolated d-pawn.
• If [font color="darkred"]25...cxd5!? [/font] (each side has an isolated d-pawn) [font colot="darkred"] 26.Nc3[/font] then:
• If [font color="darkred"]26...Qb6 27.Qb5 Qxb5 28.Nxb5 a6 [/font] is equal.
• If [font color="magenta"]26...Nf8 27.Be3 a6 28.Qd1 h6 29.Na4 Bf7 [/font] is equal.
• If [font color="blue"]25.b3!? dxc4! 26.bxc4 Qf7! [/font] then:
• [font color="blue"]27.d5 cxd5 28.cxd5 Bxd5 29.Nf4 Nxf4 30.Bxf4 Bc6 [/font] gives Black an extra pawn.
• [font color="darkblue"]27.c5 Bc4 28.Qf3 Bxa2 29.Nc3 Nf8 30.Qg3 a5 [/font] gives Black an extra pawn.

• [font color="red"]28.Bf4 Qe8 29.Kf2 Bc2 30.Bd6 Nh8 31.Nf4[/font] remains equal.

• [font color="red"]29.Qe3 Qxe3+ 30.Bxe3 Bb1 31.Nc3 Bc2 32.Kf2 h6[/font] remains equal.
• If [font color="blue"]29.gxf5?![/font] solves all of Black's problems for him and after [font color="blue"]29...Qxe2! 30.Qe3 Qxe3+ 31.Bxe3 Nh4 32.Kf2 Nxf5[/font] Black no longer has a bad Bishop while White still does and Black has an active Knight and stronger pawns.

• [font color="red"]30...Nxf4[/font] (neither side should be so anxious to take the other's bad Bishop) [font color="red"]31.Nxf4 Qd8 32.Kg2 Kf7 33.Qe3 Qa5 34.a3[/font] leaves White slightly better.

• Black would do better to exchange pawns on g4; if White recaptures with the h-pawn, it eliminates any idea he had about advancing against the Knight at g6; if he recatures with the f-pawn, it raises issues about the safety of his King.
• If [font color="red"]31...fxg4[/font] then:
• [font color="red"]32.fxg4 Qf7 33.Kg1 h5 34.gxh5 Nh4 35.h6[/font] reamins equal.


• If [font color="darkred"]32.hxg4[/font] then:
• [font color="darkred"]32...Qf7 33.Kg3 h5 34.gxh5 Ne7 35.Kf2 Nf5 36.Qe5 Qxh5[/font] reamins equal.


• [font color="magenta"]32...Qh4+ 33.Kg2 Qd8 34.Ng3 Nh4+ 35.Kf2 Ng6 36.Nh5[/font] remains equal.

[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Arkadij Naiditsch[/center][center]Position after 31...Kg8f7[/center]

• White has a slight advantage with more mobile pawns.

• White seems to have a strategy to make sure the Black Bishop remains passive behind its pawns.

• [font color="red"]33...Nxf4 34.Nxf4 Kf7 35.h4 Kg8 36.h5 Bd7[/font] gives White a small advantage in space.

• [font color="red"]35...Kg6 36.Be5 Ne6 37.Nf4+ Nxf4 38.Kxf4 Bd7[/font] gives each side a bad Bishop, but the advantage goes to White who has an active bad Bishop.

• White may have designs of breaking through on the queenside, but even failing that the advance could yield a major benefit.
• If [font color="red"]36.Bd6 Kg8 37.Be5 Nf8[/font] then:
• If [font color="red"]38.Nf4 Ne6 39.Nxe6 Bxe6[/font] then:
• [font color="red"]40.Bc7 Kf7 41.Kf4 Ke7 42.Bd6+ Kf7 43.Ke5[/font] gives White the advantage in space; his King and Bishop are inside Black's defensive parameter and Black will find it difficult to activate his own without sacrificing a pawn.
• [font color="magenta"]40.f4!? Bf7 41.Kf3 Be8 42.Ke2 Kf8 43.Kd2 Bh5![/font] is equal as Black takes advantage of his last chance to activate his Bishop/
• [font color="darkred"]38.f4 Bd7 39.h5 Be8 40.Kh4 Ne6 41.Ng3 g6 42.h6[/font] gives White Houdini rates as a small advantage, but we shall soon show is in fact winning for White.

• This move is a mistake. It limits the mobility of Black's Bishop and, to a lesser extent, the Knight. Black's pieces are now like roaches in a trap: they've checked in, but they won't check out.
• Better is [font color="red"]37...Kg8 38.Be5 Kf7 39.Ng3 Nf8 40.Bb8 Ke8 41.Bd6[/font] still leaves Black's pieces with some freedom. It is worth Black's time to consider sacrificing a pawn in order to activate the Bishop.

[center]BLACK: Arkadij Naiditsch[/center]

[center][/center]

[center]WHITE: Richard Rapport[/center][center]Position after 37..g7g6[/center]

• White's plan is:

1. Seal off the position with Black's Bishop inside its pawn chain;
2. Before putting the last brink in the wall, get the White Bishop outside of its pawnchain where it will deny the use of dark square to Black's King; and
3. Transfer the White King to the queenside in order to assist in a pawn break through.

• White wastes no time getting started.
• Now we're going to do something a little different. Insted of merely stating that White has a vastly superior position and noting in each successive note how his position has improved until his position is clearly won, my staff and I have decided to boldly declare that the position diagrammed ater Black's 37th move is won for White (Houdini gives White a small advantage) and, by following the plan outlined, White will have no difficulty winning. This requires that subsequent notes be demonstrated out to a point where the win is more than clear, often taking the variation to mate. Although we also furnish variation that White does not or cannot win, these are always the result of inaccurate play on White's part. From here out, if White makes no mistakes, he wins.
• The position for which White is aiming looks something like this:

[center]Analysis Diagram

BLACK[/center]

[center][/center]

[center]WHITE[/center]
[center]Main Analysis Position[/center]

• This position, or something like it, occurs often in the ensuing analysis of the game. We shall now demonstrate the White wins from this position, with or without the move.
• If [font color="red"]1.b5! cxb5 2.axb5 axb5 3.Nb4[/font] then:
• If [font color="red"]3...Bf7 4.Kxb5[/font] then:
• If [font color="red"]4...Be8[/font][font color="#808080"] then after 5.c6 bxc6+ 6.Nxc6 Kb7 7.Na5+ Ka7 8.Kc6 Nb6+ 9.Kc5 Ba4 10.Be5 Nd7+ 11.Kxd5 Kb6 12.Nc4+! Ka6 13.Kd6 Kb5 14.Na3+ Kb6 15.Ke6 Ka5 16.Kf7 Kb4 17.Bd6+ Kb3 18.Kg7 Nf6 19.gxf6 Kc3 20.f7 Bd7 21.f8Q White wins.[/font]

[font color="red"]
[center]Analysis Diagram[/center]
[center]BLACK[/center]

[center][/center]

[center]WHITE[/center][center]Position after 3.Nd3b5[/center]
[/font]

• If [font color="darkred"]4...Bg8 5.c6 bxc6+[/font] then:
• If [font color="darkred"]6.Nxc6! Bf7 7.Ka6 Be6 8.Na7+ Kd8 9.Kb7 Ke8 10.Kc7[/font] then:
• If [font color="darkred"]10...Bg8[/font] then:
• [font color="darkred"]11.Bb4 Bf7 12.Nc8 Bg8 13.Nd6+ Kf8 14.Kxd7[/font] then:
• If [font color="darkred"]14...Be6+ 15.Kxe6 Kg8 16.Ne8 Kh8 17.Kxd5 Kg8[/font] then:
• If [font color="darkred"]18.Ke6 Kh8 19.Ng7 Kg8 20.d5 Kh8 21.d6 Kg8 22.d7 Kh8 23.d8Q#.[/font]
• If [font color="burgundy"]18.Nf6+ Kh8 19.Ne8 Kg8 20.Ke6 Kh8 21.d5 etc.[/font] leads to mate.
• If [font color="magenta"]14...Bf7 15.Nxf5+ Kg8 16.Ne7+[/font] then:
• If [font color="magenta"]16...Kf8 17.Nxd5+ Kg8 18.Nf6+ Kh8 19.Bf8 Be6+ 20.Ke7!![/font] (20.Kxf7?? is stalemate) [font color="magenta"]20...Bg8 21.Bg7#.[/font]
• If [font color="darkorange"]16...Kh8 17.Bd6 Be8+ 18.Kd8!! Bf7 19.Be5#[/font] (18.Kxe8?? is stalemate).
• If [font color="magenta"]11.Nc6 Be6 12.Ba3[/font] then:
• If [font color="magenta"]12...Bg8 13.Ne7 Bf7 14.Nc8 Be6 15.Nd6+[/font] then:
• If [font color="magenta"]15...Kf8 16.Kd8 Nb8 17.Nc4+ Kf7 18.Ne5+ Kg8 19.Bd6[/font] then:
• If [font color="magenta"]19...Nd7 20.Nxd7 Bxd7 21.Kxd7 Kf7 22.Bc5 Kg8 23.Kd6 Kf7 24.Kxd5[/font] then:
• If [font color="magenta"]24...Ke8 25.Kd6 Kf7 26.Kd7 Kg8 27.Ke7[/font] White give mate in four move when the pawn queens on d8.
• If [font color="burgundy"]24...Kg8[/font] then after [font color="burgundy"]25.Ke6 Kh8 26.d5 Kg8 27.Ke7 Kh8 28.d6[/font] White mates in two moves.
• If [font color="darkorange"]19...Bd7 20.Nxd7 Nxd7 21.Kxd7[/font] then:
• If [font color="darkorange"]21...Kf7 22.Be5 Kf8 23.Kd6[/font] then:
• If [font color="darkorange"]23...Kf7 24.Kxd5 Ke7 25.Kc6 Kf8 26.Bf6 Kf7 27.d5[/font] White's pawn must queen.
• If [font color="purple"]23...Ke8 24.Bf6[/font] then:
• If [font color="purple"]24...Kf7 25.Kxd5 Ke8 26.Kd6 Kf7 27.d5 Ke8 28.Kc7[/font] White's pawn must queen.
• If [font color="#C08000"]24...Kf8 25.Kxd5 Kf7 26.Kd6 Ke8 27.Ke6 Kf8 28.d5[/font] White's pawn must queen.
• If [font color="hotpink"]21...Kh8 22.Ke6 Kg8 23.Ba3 Kh8 24.Kxd5 Kg8 25.Ke6[/font] the rest is forced: [font color="hotpink"]25...Kh8 26.d5 Kg8 27.d6 Kf8 28.d7+ Kg8 29.d8Q#.[/font]
• If [font color="darkorange"]15...Ke7 16.Nb7+[/font] then:
• If [font color="darkorange"]16...Ke8 17.Bb4 Bg8 18.Nd6+ Kf8 19.Kxd7[/font] then:
• If [font color="darkorange"]19...Be6+ 20.Kxe6[/font] the rest is forced:[font color="darkorange"]20...Kg8 21.Ne8 Kh8 22.Bf8 Kg8 23.Ke7 Kh8 24.Bg7+ Kg8 25.Nf6#.[/font]
• If [font color="#C08000"]19...Bd7 20.Nxd7 Nxd7 21.Kxd7[/font transposes.
• If [font color="purple"]16...Kf7 17.Kd6 Nb6 18.Nd8+ Ke8 19.Nxe6 Nc4+ 20.Kc5[/font] then:
• If [font color="purple"]20...Kf7 21.Nc7 Nxa3 22.Nxd5 Nb1 23.Nf6 Nd2 24.Kc6[/font] then:
• If [font color="purple"]24...Nf3 25.d5[/font] then:
• If [font color="purple"]25...Ne5+ 26.Kc7 Nd3 27.Nxh7 Nxf4 28.d6[/font] then:
• If [font color="purple"]28...Ne6+ 29.Kc8 f4 30.Nf6 Nxg5 31.d7 Kxf6 32.d8Q+[/font] White wins.
• If [font color="#C08000"]28...Kg8[/font] then after [font color="#C08000"]29.Nf6+ Kf8 30.h7[/font] White wins.
• If [font color="darkpink"]25...Nd4+ 26.Kd7 Ne2 27.Nxh7 Kg8 28.Nf6+ Kf7 29.d6 Nxf4 30.h7.[/font]
• If [font color="hotpink"]24...Ne4 25.d5! Nd2 26.d6[/font] then:
• If [font color="hotpink"]26...Nb3 27.Nxh7 Nd4+ 28.Kc7 Ne6+ 29.Kc8[/font] then:
• If [font color="hotpink"]29...Nxf4[/font] then after [font color="hotpink"]30.Nf6 Ne6 31.Nd5 Nxg5 32.d7 Nh7 33.d8Q[/font] White wins.
• If [font color="#C08000"]29...Nc5[/font] then after [font color="#C08000"]30.d7 Nxd7 31.Kxd7 Kg8 32.Ke8[/font] White wins by capturing the g-pawn and then, using the Knight to avoid stalemate, advancing the pawns.
• If [font color="burgundy"]26...Ne4 27.d7 Ke7 28.Nxh7 Nd6 29.Nf6[/font] when he has two passed pawns.
• If [font color="hotpink"]20...Nxa3 21.Nc7+ Kf7 22.Nxd5[/font] then:
• If [font color="hotpink"]22...Nb1 23.Nf6 Nd2 24.d5 Nb3+ 25.Kc6 Nd4+ 26.Kd7[/font] then:
• If [font color="hotpink"]26...Nb3 27.d6 Nc5+ 28.Kc7 Ne6+ 29.Kc8 Nd4 30.d7[/font] White wins.
• If [font color="burgundy"]26...Ne2[/font] then White wins after [font color="burgundy"]27.Nxh7 Nxf4 28.Nf6 Ne2 29.d6.[/font]
• If [font color="#C08000"]22...Nc2 23.Nb4[/font] then:
• If [font color="#C08000"]23...Ne1 24.d5 Ke8 25.Kc6 Nf3 26.d6 Nd4+ 27.Kd5[/font] White wins.
• If [font color="darkpink"]23...Ne3[/font] then White wins after [font color="darkpink"]24.d5 Ke8 25.Nd3 Kd8 26.d6 Nc2 27.Ne5.[/font]
• If [font color="darkorange"]12...Bf7 13.Nd8 Bg8 14.Nb7[/font] then:
• If [font color="darkorange"]14...Be6 15.Nd6+ Kf8 16.Kd8[/font] then:
• If [font color="darkorange"]16...Nb8 17.Nc4+ Kf7 18.Ne5+ Kg8 19.Bd6[/font] then:
• If [font color="darkorange"]19...Nd7 20.Nxd7 Bxd7 21.Kxd7 Kf7 22.Bc5 Kg8 23.Kd6 Kf8 24.Kxd5+[/font]gives White an extra piece and an extra pawn that is passed.
• If [font color="#C08000"]19...Be6+[/font] then the rest is forced: [font color="#C08000"]20.Kxe6 Kg8 21.Ne8 Kh8 22.Bf8 Kg8 23.Ke7 Kh8 24.Bg7+ Kg8 25.Nf6#.[/font]
• If [font color="purple"]16...Ne5 17.Nc4+ Kf7 18.Nxe5+ Kg8 19.Bd6 Bf7[/font] then:
• [font color="purple"]20.Ke7 Be6 21.Kxe6 Kh8 22.Bf8 Kg8 23.Nd7 Kh8 24.Bg7+ Kg8 25.Nf6#.[/font]
• Also winning, but more slowly, is [font color="hotpink"]20.Nxf7 Kxf7 21.Kd7 Kg8 22.Ke6 Kh8 23.Kxd5 Kg8 24.Ke6 Kh8 25.Be7[/font] when the White King is confined to two squares in the corner while the d-pawn marches forwartd triumphantly.
• If [font color="purple"]14...Kf7[/font] then:
• If [font color="purple"]15.Bb4 Ke8 16.Nd6+[/font] then:
• If [font color="purple"]16...Ke7 17.Nxf5+ Ke8 18.Nd6+ Kf8 19.Kxd7 Bf7[/font] then [font color="purple"]20.Ne4+ Kg8 21.Nf6+ Kh8 22.Kd8 Bg8 23.Bf8 Be6 24.Bg7#.[/font]
• If [font color="#F6358A"]16...Kf8 17.Kxd7 Be6+ 18.Kc7 Ke7[/font] then:
• If [font color="#F6358A"]19.Nc8+ Kf7 20.Nd6+[/font] then:
• If [font color="#F6358A"]20...Ke7 21.Ne4+ Ke8 22.Nf6+ Kf7 23.Kd8[/font] then:
• If [font color="#F6358A"]23...Bd7[/font] then [font color="#F6358A"]24.Nxd7 Ke6 25.Be7 Kf7 26.Bf8[/font] then:
• If [font color="#F6358A"]26...Kg8 27.Ke8 Kh8 28.Bg7+ Kg8 29.Nf6#.[/font]
• If [font color="burgundy"]26...Ke6 27.Bc5 Kf7 28.Nf6 Ke6 29.Kc7 Kf7 30.Kd6 Kf8 31.Ke6#.[/font]
• If [font color="#C08000"]23...Bc8 24.Kxc8 Ke6 25.Kc7 Kf7 26.Kd6 Kf8 27.Ke6#.[/font]
• If [font color="burgundy"]20...Kg8 21.Ne8 Kf7 22.Nf6 Bd7 23.Nxd7[/font] then:
• If [font color="burgundy"]23...Kg8 24.Kd6[/font] then:
• [font color="burgundy"]24...Kh8[/font] then [font color="burgundy"]25.Ke6 Kg8 26.Bf8 Kh8 27.Bg7+ Kg8 28.Nf6#.[/font]
• If [font color="#C08000"]24...Kf7[/font] then [font color="#C08000"]25.Nf6 Kf8 26.Ke6#.[/font]
• If [font color="darkpink"]23...Ke6[/font] then [font color="darkpink"]24.Nf6 Kf7 25.Kd6 Kf8 26.Ke6#.[/font]
• If [font color="burgundy"]19.Ne4+ Ke8 20.Nf6+ Kf7 21.Kd8[/font] then:
• If [font color="burgundy"]21...Bc8 22.Kxc8 Ke6 23.Kc7 Kf7 24.Kd6 Kf8 25.Ke6#.[/font]
• If [font color="#C08000"]21...Bd7 22.Nxd7 Kg8 23.Ke8 Kh8 24.Nb6 Kg8[/font] then:
• If [font color="#C08000"]25.Nxd5[/font] then [font color="#C08000"]Kh8 26.Bf8 Kg8 27.Nf6+ Kh8 28.Bg7#.[/font]
• If [font color="darkpink"]25.Ke7[/font] then [font color="darkpink"]25...Kh8 26.Nd7[/font] the rest is forced: [font color="darkpink"]26...Kg8 27.Ke8 Kh8 28.Bf8 Kg8 29.Nf6+ Kh8 30.Bg7#.[/font]
• [font color="hotpink"]15.Kxd7??[/font] is stalemate.
• If [font color="magenta"]10...Kf7 11.Bb4 Nf8 12.Nc6[/font] then:
• If [font color="magenta"]12...Ke8 13.Nd8 Bf7 14.Bxf8 Kxf8 15.Nxf7 Kxf7 16.Kd6[/font] Black's d-pawn falls and White wins.
• If [font color="darkorange"]12...Kg8[/font] then after [font color="darkorange"]13.Nd8 Bf7 14.Bxf8 Kxf8 15.Nxf7 Kxf7 16.Kd6[/font] the d-pawn falls and White wins.
• If [font color="magenta"]6.Kxc6 Kd8 7.Kb7[/font] then:
• If [font color="magenta"]7...Bf7 8.Nxd5 Bxd5+ 9.Ka6 Ke8 10.Bc7 Kf7 11.Kb5[/font] allows White no progress.
• If [font color="darkorange"]7...Ke8 8.Nc6 Be6 9.Bc5 Bf7 10.Kc7 Bg8 11.Kd6 Nf8 12.Ne7 Bf7 13.Nxd5[/font] then:
• If [font color="darkorange"]13...Bxd5 14.Kxd5 Nd7 15.Kc6[/font] then:
• If [font color="darkorange"]15...Kd8[/font] then after [font color="darkorange"]16.Kb7 Ke8 17.Kc7 Nxc5 18.dxc5[/font] White wins.
• If [font color="purple"]15...Nb8+ 16.Kb7 Nd7 17.Bb4[/font] then:
• If [font color="purple"]17...Kf7[/font] then after [font color="purple"]18.d5 Kg8 19.Kc7 Nf6 20.gxf6 g5 21.d6[/font] White wins.
• If [font color="hotpink"]17...Nf6[/font] then White wins after [font color="hotpink"]18.gxf6 g5 19.d5 gxf4 20.d6 f3 21.Bc5.[/font]
• If [font color="purple"]13...Nd7 14.Nc7+ Kd8 15.Nd5[/font] then:
• If [font color="purple"]15...Be8 16.Nf6 Nxf6 17.gxf6[/font] then:
• If [font color="purple"]17...Kc8[/font] then after [font color="purple"]18.Ke7 Kc7 19.Kxe8 Kc6 20.f7[/font] White wins.
• If [font color="#C08000"]17...g5[/font] then White wins after [font color="#C08000"]18.fxg5 Bf7 19.d5 Kc8 20.Ke7 Bg6 21.f7.[/font]
• If [font color="hotpink"]15...Bxd5 16.Kxd5[/font] then:
• If [font color="hotpink"]16...Nb8 17.Bd6 Na6 18.Ke6[/font] then:
• If [font color="hotpink"]18...Ke8[/font] then after [font color="hotpink"]19.Kf6 Kd7 20.Kg7 Kxd6 21.Kxh7 Nc7 22.Kxg6[/font] White wins.
• If [font color="burgundy"]18...Kc8 19.Kf7 Kd7 20.Kg8 Ke6[/font] then:
• If [font color="burgundy"]21.d5+[/font] then after [font color="burgundy"]21...Kxd6 22.Kxh7 Nc7 23.Kxg6 Nxd5 24.h7[/font] White wins.
• If [font color="#C08000"]21.Bf8?[/font] then after [font color="#C08000"]21...Nc7! 22.Kxh7 Kf7 23.Bg7 Nd5 24.Be5 Ne7[/font] allows White no progress.
• If [font color="burgundy"]16...Ke8 17.Ke6 Nb8 18.d5 Nd7 19.Kd6[/font] then:
• If [font color="burgundy"]19...Nb8 20.Kc7 Na6+ 21.Kb6 Nxc5 22.Kxc5[/font] then:
• If [font color="burgundy"]22...Kd7 23.d6 Kd8 24.Kc6 Kc8 25.Kd5 Kd7 26.Ke5 Kd8[/font] then:
• If [font color="burgundy"]27.Kf6[/font] then after [font color="burgundy"]Kd7 28.Kg7 Kxd6 29.Kxh7 Ke6 30.Kg8[/font] White wins.
• If [font color="#C08000"]27.Ke6[/font] then White wins after [font color="#C08000"]27...Ke8 28.Kf6 Kd7 29.Kg7 Kxd6 30.Kxh7.[/font]
• If [font color="#F6358A"]22...Ke7 23.Kc6 Kd8 24.d6 Kc8 25.Kd5[/font] then:
If [font color="#F6358A"]25...Kd7[/font] then White wins after [font color="#F6358A"]26.Ke5 Ke8 27.Ke6 Kd8 28.d7 Kc7 29.Ke7.[/font]
• If [font color="darkorchid"]25...Kd8[/font] then White wins after [font color="darkorchid"]26.Ke6 Ke8 27.Kf6 Kd7 28.Kg7 Kxd6 29.Kxh7.[/font]
• If [font color="darkpink"]19...Nxc5[/font] then White wins after [font color="darkpink"]20.Kxc5 Kd7 21.d6 Kd8 22.Kd5 Kd7 23.Ke5 Kd8 24.Kf6.[/font]
• If [font color="darkred"]3...Nb8 4.Bxb8[/font] then:
• If [font color="darkred"]4...Kxb8 5.Nxd5 Bf7 6.Nf6 Kc7 7.Nxh7[/font] then:
• If [font color="darkred"]7...Bg8 8.Nf8 Kd8 9.Kxb5 Kc7 10.h7 Bxh7 11.Nxh7[/font] then:
• If [font color="darkred"]11...Kd8 12.Kb6 Kc8 13.Nf6 Kb8 14.d5 Kc8 15.d6[/font] then:
• If [font color="darkred"]15...Kd8 16.d7[/font] then the rest is forced: [font color="darkred"]16...Ke7 17.Kc7 Ke6 18.d8Q Kf7 19.Qg8+ Ke7 20.Qe8#.[/font]
• If [font color="burgundy"]15...Kb8[/font] then [font color="burgundy"]16.d7 Ka8 17.d8Q#.[/font]
• [font color="darkpink"]11...Kb8 12.Kb6 Ka8 13.d5 Kb8 14.d6 Kc8 15.Nf6[/font] transposes.
• If [font color="magenta"]7...b4 8.Kxb4 Bg8[/font] then:
• If [font color="magenta"]9.Nf8 Kc6 10.Nxg6[/font] then:
• If [font color="magenta"]10...Kd7 11.Nf8+ Kc6 12.g6[/font] then:
• [font color="magenta"]12...Kd5[/font] then [font color="magenta"]13.h7 Bxh7 14.gxh7 Kxd4 15.h8Q+ Ke4 16.Qe5+[/font] is a clear win for White.
• [font color="burgundy"]12...Ba2 13.h7 Kd5 14.h8Q Ke4 15.Qe5+ Kf3 16.d5[/font] is a clear win for White.
• [font color="darkpink"]10...Bh7 11.Nf8 Bg8 12.g6[/font] transposes.
• If [font color="darkorange"]9.Nf6 Be6 10.h7 b5 11.Kxb5 Bc8 12.h8Q[/font] then:
• If [font color="darkorange"]12...Bd7+[/font] then [font color="darkorange"]13.Nxd7 Kxd7 14.Qe5 Kc8 15.Qe7 Kb8 16.Kb6 Ka8 17.Qa7#.[/font]
• If [font color="purple"]12...Bb7[/font] then [font color="purple"]13.Qg7+ Kb8 14.Kb6 Ba6 15.Qc7+ Ka8 16.Qa7#.[/font]
• If [font color="magenta"]4...Bf7 5.Bd6 Bg8 6.Kxb5[/font] then:
• If [font color="magenta"]6...Kd8 7.c6 bxc6+ 8.Kxc6 Be6 9.Nxd5 Bd7+ 10.Kb6 Be6 11.Nf6 Bc4 12.d5[/font] then:
• If [font color="magenta"]12...Kc8 13.Nxh7 Kd7 14.Nf6+ 14...Kxd6 15.h7 Bxd5 16.h8Q[/font] then:
• If [font color="magenta"]16...Bc6 17.Qd8+ Ke6 18.Kxc6 Kf7 19.Qg8+ Ke7 20.Qe8#.[/font]
• If [font color="burgundy"]16...Bg8[/font] then [font color="burgundy"]17.Qxg8 Ke7 18.Qe8+ Kd6 19.Qe5#.[/font]
• If [font color="darkorange"]12...Bxd5 13.Nxd5 Kd7 14.Be7[/font] then:
• If [font color="darkorange"]14...Kc8[/font] then [font color="darkorange"]15.Nf6 Kb8 16.Nxh7 Ka8 17.Nf6 Kb8 18.h7 Kc8 19.h8Q#.[/font]
• If [font color="purple"]14...Ke8 15.Kc6 Kf7 16.Kd7 Kg8 17.Ke8 Kh8 18.Bf6+ Kg8 19.Ne7#.[/font]
• If [font color="darkorange"]6...Bf7 7.Kb6[/font] then:
• If [font color="darkorange"]7...Kd7 8.Kxb7 Be6 9.Nd3 Kd8 10.c6 Bc8+ 11.Kb8[/font] then:
• If [font color="darkorange"]11...Be6 12.c7+ Ke8 13.Nc5[/font] then:
• If [font color="darkorange"]13...Kf7 14.Nxe6[/font] then:
• If [font color="darkorange"]14...Kxe6[/font] then [font color="darkorange"]15.c8Q+ Kxd6 16.Qb7 Ke6 17.Kc8 Kd6 18.Qd7#.[/font]
• If [font color="burgundy"]14...Ke8[/font] then [font color="burgundy"]15.c8Q+ Kf7 16.Qf8+ Kxe6 17.Qe7#.[/font]
• If [font color="#C08000"]13...Bf7[/font] then [font color="#C08000"]14.c8Q#.[/font]
• If [font color="purple"]11...Ba6[/font] then [font color="purple"]12.Nc5 Bc8 13.c7+ Ke8 14.Kxc8 Kf7 15.Kd7 Kg8 16.c8Q+ Kf7 17.Qf8#.[/font]
• If [font color="purple"]7...Be6 8.Nd3 Kd7 9.Kxb7[/font] then:
• If [font color="purple"]9...Bg8 10.Ne5+ Ke8 11.Nxg6[/font] then:
• If [font color="purple"]11...Bf7 12.Ne5 Bh5 13.c6[/font] then:
• If [font color="purple"]13...Bf7[/font] then [font color="purple"]14.g6 Be6 15.gxh7 Kd8 16.h8Q+ Bg8 17.Qxg8#.[/font]
• If [font color="darkpink"]13...Be2 14.g6 Bb5 15.gxh7 Bxc6+ 16.Kxc6 Kd8 17.h8Q#.[/font]
• If [font color="hotpink"]11...Kd7 12.Ne5+ Kd8 13.c6[/font] then:
• If [font color="hotpink"]13...Be6 14.g6 hxg6[/font] then:
• If [font color="hotpink"]15.c7+[/font] then [font color="hotpink"]15...Ke8 16.h7 Bc8+ 17.Kxc8 g5 18.h8Q#.[/font]
• If [font color="darkpink"]15.h7[/font] then [font color="darkpink"]15...Bc8+ 16.Kb8 Bd7 17.h8Q+ Be8 18.c7#.[/font]
• If [font color="burgundy"]13...Ke8 14.c7 Be6 15.g6 Bd7[/font] then:
• If [font color="burgundy"]16.g7[/font] then [font color="burgundy"]16...Be6 17.g8Q+ Bxg8 18.c8Q#.[/font]
• If [font color="#C08000"]16.Nxd7[/font] then [font color="#C08000"]16...Kxd7 17.c8Q+ Kxd6 18.g7 Ke7 19.g8Q Kd6 20.Qgf8#.[/font]
• If [font color="burgundy"]9...Ke8 10.c6 Bd7 11.c7[/font] then:
• If [font color="burgundy"]11...Kf7 12.Ne5+ Ke8 13.Nxd7[/font] then:
• If [font color="burgundy"]13...Kxd7 14.Bb4 Ke6 15.c8Q+ Kf7 16.Qc7+ Kg8 17.Qg7#.[/font]
• If [font color="#C08000"]13...Kf7[/font] then [font color="#C08000"]14.c8Q Ke6 15.Nc5+ Kxd6 16.Qd7#.[/font]
• If [font color="#C00080"]11...Be6[/font] then [font color="#C00080"]12.Nc5 Kf7 13.Nxe6 Kxe6 14.Bf8 Kf7 15.c8Q Kg8 16.Qd8 Kh8 17.Bg7#.[/font]

• [font color="#808080"]If 1.b5 cxb5 2.axb5 axb5 3.Nb4 Bf7 4.Kxb5 Be8 5.c6 then:[/font]
• If [font color="red"]5...bxc6+[/font] then:
• If [font color="red"]6.Nxc6 6...Kb7 7.Na5+ Ka7 8.Kc6 then:[/font]
• If [font color="red"]8...Nb6+ 9.Kc5[/font][font color="#808080"] then after 9...Ba4 10.Be5 Nd7+ 11.Kxd5 Kb6 12.Nc4+! Ka6 13.Kd6 Kb5 14.Na3+ Kb6 15.Ke6 Ka5 16.Kf7 Kb4 17.Bd6+ Kb3 18.Kg7 Nf6 19.gxf6 Kc3 20.f7 Bd7 21.f8Q White wins.[/font]

[font color="red"]
[center]Analysis Diagram[/center]
[center]BLACK[/center]

[center][/center]

[center]WHITE[/center][center]Position after 5.c5c6[/center]
[/font]

• If [font color="darkred"]8...Nf6+ 9.Kc7 Ne4 10.Be5[/font] then:
• If [font color="darkred"]10...Ba4[/font] then after [font color="darkred"]11.Nb7 Be8 12.Nd8 Nd2 13.Ne6 Nc4 14.Nf8![/font] Black's a-pawn must fall.
• [font color="magenta"]10...Ka6 11.Kd8 Ba4 12.Bc7 Bb5 13.Ke7 Nc3 14.Kf8[/font] leaves Black now way to save his a-pawn or prevent White from queen his.
• If [font color="darkred"]6.Kxc6? Nf6+ 7.Kc5[/font] then:
• If [font color="darkred"]7...Ng4 8.Be5 Bf7 9.Kd6 Kd8 10.Nxd5 Bxd5 11.Kxd5 Kd7 12.Bh8 Ne3+[/font] ends in a draw after 13.Ke5 Ng4+ 14.Kd5 Ne3+ 15.Ke5 Ng4+ etc.[/font]
• If [font color="magenta"]7...Ne4+??[/font] then White wins after [font color="magenta"]8.Kxd5 Nxd6 9.Kxd6.[/font]
• If [font color="darkred"]5.Ka5[/font] then:
• If [font color="darkred"]5...Bf7 6.Kb5 Be8 7.c6 bxc6+[/font] then:
• If [font color="darkred"]8.Kxc6? Nf6+ 9.Kb6 Ne4 10.Nxd5 Nxd6 11.Nf6[/font] then:
• If [font color="darkred"]11...Kd8 12.Nxh7 Nf7 13.Nf6 Ba4 14.h7[/font] then:
• If [font color="darkred"]14...Nh8 15.d5 Ke7 16.Kc7[/font] then:
• If [font color="darkred"]16...Nf7 17.Ng8+ Kf8 18.Nh6[/font] then:
• If [font color="darkred"]18...Nh8 19.Kd8 Kg7 20.Ke7[/font] then:
• If [font color="darkred"]20...Bd1 21.d6 Ba4 22.d7 Bxd7 23.Kxd7 Kxh7 24.Ke8[/font] then:
• If [font color="darkred"]24...Kg7 25.Ke7 Nf7 26.Nxf7[/font] then:
• If [font color="darkred"]26...Kg8 27.Nh6+ Kg7 28.Ke8 Kh8 29.Kf7 Kh7 30.Nxf5!![/font] then:
• If [font color="darkred"]30...gxf5[/font] then [font color="darkred"]31.g6+ Kh8 32.g7+ Kh7 33.g8Q+ Kh6 34.Qg6#.[/font]
• If [font color="magenta"]30...Kh8 31.Ne7 Kh7 32.Ng8 Kh8 33.f5[/font] then:
• If [font color="magenta"]33...gxf5[/font] then [font color="magenta"]34.Nf6 f4 35.g6 f3 36.g7#.[/font]
• If [font color="darkorange"]33...Kh7[/font] then [font color="darkorange"]34.fxg6+ Kh8 35.g7+ Kh7 36.Nf6#.[/font]
• If [font color="magenta"]26...Kh7 27.Nh6 Kh8 28.Kf7 Kh7 29.Nxf5 gxf5 30.g6+[/font] then:
• If [font color="magenta"]30...Kh6[/font] then [font color="magenta"]31.g7 Kh5 32.g8Q Kh4 33.Qg2 Kh5 34.Qg5#.[/font]
• If [font color="darkorange"]30...Kh8[/font] then [font color="darkorange"]31.g7+ Kh7 32.g8Q+ Kh6 33.Qg6#.[/font]
• If [font color="magenta"]24...Nf7 25.Kxf7 Kh8 26.Ng8 Kh7[/font] then:
• If [font color="magenta"]27.Ne7 Kh8 28.Nxg6+ Kh7[/font] then:
• If [font color="magenta"]29.Ne7[/font] then [font color="magenta"]Kh8 30.Nxf5 Kh7 31.g6+ Kh8 32.g7+ Kh7 33.g8Q#.[/font]
• If [font color="purple"]29.Nh4[/font] then White wins after [font color="purple"]29...Kh8 30.Nxf5 Kh7 31.g6+.[/font]
• If [font color="darkorange"]27.Nf6+[/font] then White wins after [font color="darkorange"]27...Kh8 28.Nd7 Kh7 29.Nf8+ Kh8 30.Nxg6+ Kh7 31.Ne7 Kh8 32.Kf6 Kh7 33.g6+.[/font]
• If [font color="darkpink"]20...Bb5[/font] then White wins after [font color="darkpink"]21.d6 Bc6 22.d7 Bxd7 23.Kxd7 Kf8 24.Kd8 Kg7 25.Ke7.[/font]
• If [font color="darkorchid"]18...Kg7[/font] then White wins after [font color="darkorchid"]19.Nxf7 Kxf7 20.h8Q.[/font]
• If [font color="magenta"]16...Kf8 17.d6 Nf7 18.d7[/font] then:
• If [font color="magenta"]18...Kg7 19.d8Q Nxd8 20.Kxd8 Bb3 21.Ke7[/font] then:
• If [font color="magenta"]21...Ba2 22.Nd7 Kxh7 23.Kf6 Bb3 24.Nf8+ Kg8 25.Nxg6.[/font]
• If [font color="darkorange"]21...Kh8 22.Nd7 Kxh7 23.Nf8+ Kh8 24.Nxg6+ Kg7 25.Nh4[/font] then:
• If [font color="darkorange"]25...Bg8 26.Kd6 Ba2 27.Ke5[/font] then:
• If [font color="magenta"]27...Bb1[/font] then White wins after [font color="darkorange"]28.Nxf5+ Kg6 29.Ne7+ Kf7 30.Nf5 Bd3 31.Ng3.[/font]
• If [font color="purple"]27...Bf7[/font] then White wins after [font color="purple"]28.Kxf5 Kf8 29.Ke5 Bh5 30.f5.[/font]
• If [font color="hotpink"]25...Bc2[/font] then White wins after [font color="hotpink"]26.Ke6 Kh7 27.Nxf5 Bb3+ 28.Kf6 Kh8 29.g6.[/font]
• If [font color="darkorange"]18...Bxd7 19.Kxd7 Kg7 20.Ke7 Kh8 21.Ng8[/font] then:
• If [font color="darkorange"]21...Nxg5 22.fxg5 Kxh7 23.Kf7 Kh8 24.Nf6[/font] the rest is forced: [font color="darkorange"]24...f4 25.Kxg6 f3 26.Kh6 f2 27.g6 f1Q 28.g7#.[/font]
• If [font color="purple"]21...Kxh7[/font] then after [font color="purple"]22.Kxf7 Kh8 23.Nh6 Kh7 24.Nxf5 Kh8 25.Ne7.[/font]
• If [font color="magenta"]14...Bc2 15.d5 Nh8 16.d6 Ba4 17.Kc5[/font] then:
• If [font color="magenta"]17...Nf7 18.Kd5 Bc2 19.Kd4 Bb1 20.Ng8[/font] then:
• If [font color="magenta"]20...Ke8 21.Nh6 Nh8 22.Ke5 Nf7+ 23.Nxf7 Kd7 24.h8Q Ba2[/font] then:
• If [font color="magenta"]25.Qa8 Bd5 26.Qxd5 Ke8 27.d7+ Kf8 28.d8Q+ Kg7 29.Qh8#.[/font]
• If [font color="darkorange"]25.Qd8+ Kc6 26.Qc7+ Kb5[/font] then:
• If [font color="darkorange"]27.Nd8 Bd5 28.Kxd5 Ka4 29.Qc2+ Kb4 30.Nc6+ Kb5[/font] then:
• If [font color="darkorange"]31.Qc4+[/font] then [font color="darkorange"]31...Kb6 32.Qa4 Kb7 33.Qa7+ Kc8 34.Qc7#.[/font]
• If [font color="hotpink"]31.d7 Kb6 32.Qa4 Kb7 33.Qa7#.[/font]
• If [font color="purple"]27.d7[/font] then [font color="purple"]27...Ka4 28.d8Q Bc4 29.Qxc4+ Ka3 30.Qdd3+ Kb2 31.Qcb3+ Kc1 32.Qbc2#.[/font]
• If [font color="darkorange"]20...Kd7 21.Nh6 Nh8 22.Ke5[/font] then:
• If [font color="darkorange"]22...Bd3[/font] then White wins after [font color="darkorange"]23.Kf6 Be2 24.Kg7 Kxd6 25.Kxh8 Bc4 26.Kg7.[/font]
• If [font color="purple"]22...Be4[/font] then White wins after [font color="purple"]23.Kf6 Kxd6 24.Nf7+ Nxf7 25.Kxf7 Bd5+ 26.Kg7.[/font]
• If [font color="darkorange"]17...Bd7 18.Kd5 Nf7 19.Ng8 Nh8 20.Nh6 Ke8 21.Ke5[/font] then:
• If [font color="darkorange"]21...Kf8[/font] then after [font color="darkorange"]22.Kf6 Ba4 23.Ng8 Nf7 24.Ne7 Ke8 25.Nxg6[/font] White wins.
• If [font color="purple"]21...Bc6 22.Ke6 Bb5 23.Kf6[/font] then:
• If [font color="purple"]23...Bd7[/font] then after [font color="purple"]24.Kg7 Bc6 25.Kg8 Kd7 26.Kxh8 Bd5 27.Kg7[/font] White wins.
• If [font color="hotpink"]23...Kd7[/font] then after [font color="hotpink"]24.Kg7 Be2 25.Kxh8 Kxd6 26.Kg7[/font] the pawn queens.
• If [font color="magenta"]11...Kb8 12.Nxh7 Kc8 13.Nf8[/font] then:
• If [font color="magenta"]13...Nf7 14.h7 Nh8 15.Kc5[/font] then:
• If [font color="magenta"]15...Kd8 16.Kd6 Ba4 17.Ke6[/font] then:
• If [font color="magenta"]17...Be8[/font] then after [font color="magenta"]18.Kf6 Bf7 19.d5 Be8 20.d6 Kc8 21.Kg7 Nf7 22.d7+!![/font] White wins.
• If [font color="hotpink"]17...Bd1[/font] then White wins after [font color="hotpink"]18.d5 Bb3 19.Kf6 Bxd5 20.Nxg6 Nf7 21.Ne5 Nh8 22.Kg7.[/font]
• [font color="purple"]15...Ba4 16.Kd6 Kd8 17.Ke6[/font] transposes.
• If [font color="darkorange"]13...Nc4+[/font] then White wins after [font color="darkorange"]14.Kc5 Nb2 15.h7.[/font]
• If [font color="magenta"]8.Ka6[/font] then:
• If [font color="magenta"]8...c5 9.Bxc5 Kc7 10.Nxd5+ Kc6 11.Ne7+ Kc7 12.Ka7[/font] gives White an extra pawn, but Black has excellent drawing chances.
• If [font color="darkorange"]8...Nb8+? 9.Bxb8![/font] then:
• If [font color="darkorange"]9...Kxb8 10.Kb6 Kc8 11.Nxc6[/font] then:
• If [font color="darkorange"]11...Bf7 12.Kc5 Kd7 13.Nb4 Bg8 14.Nxd5 Bf7 15.Nf6+[/font] followed by [font color="darkorange"]16.Nxh7[/font] wins.
• [font color="purple"]11...Bxc6 12.Kxc6 Kd8 13.Kxd5 Ke7 14.Ke5 Kd7 15.Kf6[/font] will soon give White two passers; Black cannot stop both.
• [font color="hotpink"]9...c5 10.dxc5 d4 11.Be5 Ba4 12.Bxd4[/font] gives White an extra piece an extra (passed) pawn.
• If [font color="magenta"]5...Kd8 6.Nxd5 Bf7 7.Nc7[/font] then:
• If [font color="magenta"]7...Ba2 8.Kb4 Bg8 9.d5 Kc8 10.Kb5 Bf7 11.c6[/font] then:
• If [font color="magenta"]11...Nb8 12.Kb6 Nxc6 13.dxc6 Bd5 14.cxb7+ Bxb7 15.Ne8[/font] followed by 16.Nf6 wins for White.
• If [font color="burgundy"]11...Bg8 12.cxd7+ Kxd7 13.Be5 Bf7 14.Kc5 b5 15.Kxb5[/font] leaves White a piece to the good.
• If [font color="darkorange"]7...Bc4 8.Kb4[/font] then:
• If [font color="darkorange"]8...Bg8 9.Kb5 Bf7 10.d5 Nb8 11.Ne6+[/font] then:
• If [font color="darkorange"]11...Bxe6 12.dxe6 Nc6 13.Kb6 Ke8 14.e7 Nb4 15.Kxb7[/font] gives White two passed pawn.
• If [font color="purple"]11...Kc8 12.Bxb8 Kxb8 13.Kb6 Bg8 14.Nf8[/font] then:
• If [font color="purple"]14...Kc8 15.d6 Kd8 16.Kxb7 Bd5+ 17.c6 Ke8 18.Nd7 Be4 19.Nf6+[/font] will soon give White three passed pawns.
• If [font color="hotpink"]14...Bxd5[/font] then White wins after [font color="hotpink"]15.Nxh7 Bg8 16.Nf6 Bc4 17.h7.[/font]
• If [font color="purple"]8...Ba2 9.d5 Kc8 10.Kb5 Bb1 11.c6[/font] then:
• If [font color="purple"]11...bxc6+ 12.dxc6 Bd3+ 13.Ka5 Be4 14.cxd7+ Kxd7 15.Kb5[/font] allows White to win the h-pawn after [font color="purple"]15...Kxd6 17.Ne8+ Ke6 18.Nf6.[/font]
• If [font color="hotpink"]11...Bd3+ 12.Ka5 bxc6 13.dxc6 Be4 14.Kb5 Nb8 15.Ne6 Nxc6 16.Nf8[/font] wins the h-pawn.

• [font color="#808080"]If 1.b5 cxb5 2.axb5 axb5 3.Nb4 Bf7 4.Kxb5 Be8 5.c6 bxc6+ 6.Nxc6 Kb7 7.Na5+ Ka7 8.Kc6 Nb6+ 9.Kc5[/font] then:
• If [font color="red"]9...Ba4 10.Be5[/font][/font][font color="#808080"] then after 10...Nd7+ 11.Kxd5 Kb6 12.Nc4+! Ka6 13.Kd6 Kb5 14.Na3+ Kb6 15.Ke6 Ka5 16.Kf7 Kb4 17.Bd6+ Kb3 18.Kg7 Nf6 19.gxf6 Kc3 20.f7 Bd7 21.f8Q White wins.[/font]

[font color="red"]
[center]Analysis Diagram[/center]
[center]BLACK[/center]

[center][/center]

[center]WHITE[/center][center]Position after 9.Kc6c5[/center]
[/font]

• If [font color="darkred"]9...Bd7 10.Bc7 Na8 11.Be5[/font] then:
• If [font color="darkred"]11...Be8[/font] then:
• If [font color="darkred"]12.Kxd5 Nb6+ 13.Ke6[/font] then:
• If [font color="darkred"]13...Ka6[/font] then after [font color="darkred"]14.Kf6 Nd5+ 15.Kg7 Kxa5 16.Kxh7 Kb6 17.Kg7[/font] White advances the a-pawn and wins.
• If [font color="magenta"]13...Nc8 14.Kf6 Kb6 15.Nb3[/font] then:
• If [font color="magenta"]15...Kb5[/font] then White wins after [font color="magenta"]16.Kg7 Ne7 17.Kxh7 Kc4 18.Nc5 Bc6 19.Kg7.[/font]
• If [font color="darkorange"]15...Kc6[/font] then after [font color="darkorange"]16.Kg7 Kd5 17.Kxh7 Ke6 18.Kg7 Nd6 19.Nc5+[/font] White will have time to advance the pawn and win.
• If [font color="magenta"]12.Nc6+!?[/font] (since White has a dark-bound Bishop that is unable to capture Black's pawns, White needs to preserve his Knight) [font color="magenta"12...Bxc6! 13.Kxc6 Nb6[/font] then:
• If [font color="magenta"]14.Bb8+[/font] then:
• If [font color="magenta"]14...Kxb8 15.Kxb6 Kc8 16.Kc6[/font] then:
• If [font color="magenta"]16...Kd8 17.Kxd5 Kd7 18.Ke5 Ke7 19.d5[/font] then:
• If [font color="magenta"]19...Kd7 20.d6 Kd8 21.Ke6 Ke8 22.Kf6 Kd7 23.Kg7[/font] then:
• If [font color="magenta"]23...Kxd6[/font] then after [font color="magenta"]24.Kxh7 Ke7 25.Kg7 Ke6 26.h7[/font] White wins.
• If [font color="burgundy"]23...Ke6[/font] then White wins after [font color="burgundy"]24.Kxh7 Kf7 25.d7.[/font]
• If [font color="darkpink"]19...Kd8[/font] then White wins after [font color="darkpink"]20.Kd6 Kc8 21.Ke7 Kc7 22.d6+ Kc8 23.d7+.[/font]
• If [font color="darkorange"]16...Kb8 17.Kxd5 Kb7[/font] then:
• If [font color="darkorange"]18.Ke6 18...Kc7 19.Ke7 Kc6 20.Kf7[/font] then:
• If [font color="darkorange"]20...Kd5 21.Kg7 Ke4 22.Kxh7 Kxf4 23.Kxg6 Ke4 24.h7[/font] White wins.
• If [font color="purple"]20...Kd6[/font] then White wins after [font color="purple"]21.Kg7 Ke7 22.Kxh7 Kf7 23.d5 Ke8 24.Kxg6.[/font]
• If [font color="hotpink"]18.Kd6[/font] then White wins after [font color="hotpink"]18...Kb6 19.d5 Kb7 20.Kd7 Kb6 21.Ke7 Kc7 22.d6+.[/font]
• If [font color="darkorange"]14...Ka6 15.Bc7 Nc8 16.Kxd5 Kb7[/font] then:
• If [font color="darkorange"]17.Ba5 Na7 18.Ke6[/font] then:
• If [font color="darkorange"]18...Nb5 19.d5 Nd4+ 20.Ke7 Ka6 21.Bc3 Nb5 22.Kf7[/font] leaves Black's King too distant to affect the outcome; White wins.
• If [font color="#C08000"]18...Nc6 19.Kf6!![/font] White needs the tempo more than he need the Bishop [font color="#C08000"]19...Ka6 20.Kg7[/font] White wins.
• If [font color="purple"]17.Be5? Nb6+ 18.Ke6 Kc8 19.d5[/font] then:
• If [font color="purple"]19...Kd8 20.Bf6+ Ke8 21.d6 Nd7 22.Bd4 Nf8+ 23.Kf6[/font] then:
• After [font color="purple"]23...Nd7+ 24.Kg7 Nb8 25.Bf2 Nd7 26.Kxh7 Kf7 27.Kh8 Kf8[/font] White can make no progress.
• If [font color="#C08000"]23...Kd7?[/font] then White wins after [font color="#C08000"]24.Kg7! Ne6+ 25.Kxh7 Nxd4 26.Kxg6 Ne2 27.h7.[/font]
• If [font color="hotpink"]19...Nxd5? 20.Kxd5 Kd8[/font] then:
• After [font color="hotpink"]21.Ke6 Ke8 22.Bg7! Kd8 23.Kf7 Kc8 24.Kg8 Kd7 25.Kxh7 Ke8 26.Kg8[/font] Black cannot stop the pawn.
• After [font color="burgundy"]21.Kd6? Ke8 22.Ke6 Kf8 23.Bg7+ Kg8[/font] White can make no progress.
• If [font color="darkorange"]14.Bc7 Na4 15.Kxd5[/font] then:
• If [font color="darkorange"]15...Kb7 16.Be5 Nb6+ 17.Kd6[/font] then:
• If [font color="darkorange"]17...Kc8 18.Kc6 Nc4 19.Kd5 Ne3+ 20.Ke6 Kd8 21.Kf6[/font] then:
• If [font color="darkorange"]21...Nd5+ 22.Ke6 Nc3 23.Kf6 Kd7 24.Bb8 Nd5+ 25.Kf7[/font] White can make no progress after taking the a-pawn.
• If [font color="#C08000"]21...Kd7[/font] then after [font color="#C08000"]22.Kg7 Ke6 23.Kxh7 Kf7 24.Bc7 Nd5 25.Bd6 Nc3[/font] White can make no progress.
• If [font color="purple"]17...Nc4+ 18.Ke6 Kc6[/font] then:
• If [font color="purple"]19.d5+ Kb7 20.d6 Na5 21.d7 Nc6[/font] then:
• If [font color="purple"]22.Kf7[/font] then after [font color="purple"]22...Nd8+ 23.Kg7 Kc6 24.Kxh7 Kxd7 25.Kg7[/font] White wins.
• If [font color="darkpink"]22.Kd6[/font] then White wins after [font color="darkpink"]22...Nd8 23.Bf6 Nc6 24.d8Q Nxd8 25.Bxd8 Kc8 26.Ke7.[/font]
• If [font color="hotpink"]19.Kf7 Kd5 20.Kg8 Ke6 21.Kxh7 Kf7 22.d5[/font] then:
• If [font color="hotpink"]22...Nb6! 23.d6 Nd7 24.Bg7 Nc5 25.Bd4 Ne6 26.Bf6 Nc5 27.Be5 Nd7[/font] White can make no progress.
• If [font color="burgundy"]22...Nxe5?[/font] then after [font color="burgundy"]23.fxe5! Ke7 24.Kg7 Kd7 25.h7[/font] White wins.
• If [font color="purple"]15...Ka6 16.Be5 Nb6+ 17.Ke6 Nc8[/font] then:
• Black's King is too distant to affect the outcome of the game, thus White wins after[font color="purple"]18.Kf6! Kb7 19.Kg7 Kc6 20.Kxh7 Kd7 21.Kg7.[/font]
• White also wins after [font color="hotpink"]18.d5 Kb6 19.d6 Kc6 20.d7 Nb6 21.d8Q.[/font]
• If [font color="magenta"]11...Nb6 12.Nc6+ Bxc6 13.Kxc6 Ka6 14.Bc7[/font] then:
• If [font color="magenta"]14...Na4 15.Kxd5 Kb7 16.Be5[/font] then:
• If [font color="magenta"]16...Nb6+ 17.Kc5 Na4+ 18.Kd6[/font] then:
• If [font color="magenta"]18...Nb2[/font] then White wins after [font color="magenta"]19.d5 Nc4+ 20.Ke6 Kb6 21.d6 Na5 22.Ke7.[/font]
• If [font color="burgundy"]18...Nb6[/font] then White wins after [font color="burgundy"]19.d5 Nc4+ 20.Ke6.[/font]
• If [font color="darkorange"]16...Nc3+ 17.Kd6 Ne4+ 18.Ke6 Kb6 19.d5[/font] then:
• If [font color="darkorange"]19...Kb7 23.Ba7 Nf8 24.Kxf8[/font] then:
• If [font color="darkorange"]24...Kd7[/font] then White wins after [font color="darkorange"]25.Bc5 Ke6 26.Kg7 Kd7 27.Kxh7 Ke6 28.Kg8.[/font]
• If [font color="#C08000"]24...Kxd6[/font] then White wins after [font color="#C08000"]25.Kg8 Ke6 26.Kxh7 Kf7 27.Bd4 Ke6 28.Kxg6.[/font]
• If [font color="purple"]22...Nb7[/font] then:
• If [font color="purple"]23.Be5[/font] then after [font color="purple"]23...Nc5 24.Bd4 Nb3 25.d7[/font] White wins.
• If [font color="hotpink"]23.d7?[/font] then after [font color="hotpink"]23...Kb5 24.Kf7 Kc6 25.Bf6 Kxd7 26.Kg7 Ke8 27.Kxh7 Kf7[/font] White can make no progress.
• If [font color="purple"]19...Kb5 20.d6[/font] then:
• If [font color="purple"]20...Nc5+ 21.Ke7 Kc6 22.Bd4 Nb7 23.d7 Kb5.[/font]
• If [font color="hotpink"]20...Kc6 21.Ke7[/font] then:
• If [font color="hotpink"]21...Nxd6 22.Bxd6 Kd5 23.Be5 Kc6 24.Kf7 Kd7 25.Kg8[/font] then:
• If [font color="hotpink"]25...Ke8 26.Bg7 Ke7 27.Kxh7 Ke8 28.Kxg6 Ke7 29.h7.[/font]
• If [font color="darkpink"]25...Ke7[/font] then White wins after [font color="darkpink"]26.Bg7 Ke6 27.Kxh7 Kf7 28.Bf6 Ke6 29.Kxg6.[/font]
• If [font color="burgundy"]21...Nc5 22.Bd4 Nb7 23.d7[/font] then:
• If [font color="burgundy"]23...Kc7[/font] then White wins after [font color="burgundy"]24.Be5+ Kc6 25.d8Q Nxd8 26.Kxd8 Kd5 27.Kd7 Kc5 28.Ke7 Kd5 29.Kf7.[/font]
• If [font color="#C08000"]23...Kd5[/font] then White wins after [font color="#C08000"]24.Be5 Kc5 25.d8Q! Nxd8 26.Kxd8 Kc6 27.Ke7! Kd5 28.Kf7.[/font]
• If [font color="darkorange"]14...Nc4 15.Kxd5 Ne3+ 16.Kc6 Nc2 17.d5 Nb4+ 18.Kd6 Ka7 19.Ba5[/font] then:
• If [font color="darkorange"]19...Na6 20.d6 Nc5+ 21.Ke7 Kc6 22.Bd4[/font] then:
• If [font color="darkorange"]22...Nd7! 20.Ke7 Nb8 21.Bc7 Na6 22.d6 Nc5 23.d7[/font] then:
• If [font color="darkorange"]23...Nb7[/font] then White wins after [font color="darkorange"]24.Be5 Nd8 25.Kxd8 Kb7 26.Ke7.[/font]
• If [font color="burgundy"]23...Nxd7[/font] then White wins after [font color="burgundy"]24.Kxd7 Kb7 25.Be5 Kb6 26.Kd6 Kb5 27.Ke6.[/font]
• If [font color="purple"]19...Nd3 20.Kc6 Nxf4 21.d6[/font] then:
• If [font color="purple"]21...Nd3 22.Bc3 Nf4 23.d7[/font] then:
• If [font color="purple"]23...Ne6[/font] then White wins after [font color="purple"]24.Bf6 f4 25.Kd6 Kb6 26.Kxe6 Kc5 27.d8Q.[/font]
• If [font color="#C08000"]23...Nd5[/font] then White wins after [font color="#C08000"]24.d8Q Nxc3 25.Qd4+.[/font]
• If [font color="hotpink"]21...Ne6[/font] then White wins after [font color="hotpink"]22.d7 Ka6 23.Bb6 f4 24.Kd5 Kxb6 25.Kxe6 Kc7 26.Ke7.[/font]

• [font color="#808080"]If 1.b5 cxb5 2.axb5 axb5 3.Nb4 Bf7 4.Kxb5 Be8 5.c6 bxc6+ 6.Nxc6 Kb7 7.Na5+ Ka7 8.Kc6 Nb6+ 9.Kc5 Ba4 10.Be5[/font] then:
• If [font color="red"]10...Nd7+ 11.Kxd5[/font] then:
• [font color="red"]11...Kb6[/font] then:
• [font color="red"]12.Nc4+![/font] (White evades a critical trap) [font color="red"]12...Ka6 13.Kd6 Kb5 14.Na3+ Kb6 15.Ke6[/font] then:
• If [font color="red"]15...Ka5 16.Kf7 Kb4 17.Bd6+ Kb3 18.Kg7[/font] then:
• [font color="red"]18...Nf6[/font] then after [font color="red"]19.gxf6 Kc3 20.f7 Bd7 21.f8Q[/font] White wins.

[font color="red"]
[center]Analysis Diagram[/center]
[center]BLACK[/center]

[center][/center]

[center]WHITE[/center][center]Position after 10.Bd6e5[/center]
[/font]

• If [font color="darkred"]18...Kc3 19.Kxh7[/font] then:
• If [font color="darkred"]19...Bb3 20.Kxg6[/font] then:
• If [font color="darkred"]20...Nf6 21.h7 Nxh7 22.Kxh7 Kxd4 23.g6 Kd5[/font] then:
• If [font color="darkred"]24.g7 Kxd6[/font] then:
• If [font color="darkred"]25.Nc2 Kc5 26.Ne1 Kd4 27.Nf3+[/font] then:
• If [font color="darkred"]27...Ke3[/font] then after [font color="darkred"]28.Nh4 Ke4 29.Ng6 Kf3 30.g8Q Bxg8+ 31.Kxg8[/font] White wins.
• If [font color="burgundy"]27...Ke4[/font] then [font color="burgundy"]28.Nd2+![/font] wins the Bishop and the pawn queens.
• If [font color="magenta"]25.Nb5+ Kc5 26.Nc7[/font] then:
• If [font color="magenta"]26...Kc6[/font] then White wins after [font color="magenta"]
27.Ne8 Bf7 28.Nf6 Kd6 29.g8Q Bxg8+ 30.Nxg8.[/font]
• If [font color="darkorange"]26...Bf7 27.Ne8 Kd5 28.Nf6+ Kd4 29.Kh6[/font] then:
• If [font color="darkorange"]29...Ke3[/font] then after [font color="darkorange"]30.Kg5 Kf3 31.g8Q Bxg8 32.Nxg8 Ke4 33.Nf6+[/font] White wins.
• If [font color="purple"]29...Ba2[/font] then after [font color="purple"]30.g8Q Bxg8 31.Nxg8 Ke4 32.Kg5[/font] the Black King must abandon his pawn and White wins.
• If [font color="magenta"]24.Be7 Ba2 25.Bf6 Bb3 26.g7 Ke4 27.Be5[/font] then:
• If [font color="magenta"]27...Ke3[/font] then White wins after [font color="magenta]
28.Nb1 Bd5 29.Nc3 Be6 30.g8Q Bxg8+ 31.Kxg8.[/font]
• If [font color="darkorange"]27...Bf7 28.Kh8 Kd5 29.Nb5 Kc6 30.Nd4+[/font] then:
• If [font color="darkorange"]30...Kd5[/font] then White wins after [font color="darkorange"]
31.Nxf5 Be6 32.Ne7+ Kc5 33.g8Q Bxg8 34.Kxg8.[/font]
• If [font color="purple"]30...Kd7[/font] then White wins after [font color="purple"]
31.Nxf5 Bc4 32.Nd4 Bf7 33.g8Q Bxg8 34.Kxg8.[/font]
• If [font color="burgundy"]20...Bg8[/font] then after [font color="burgundy"] 21.Kg7 Be6 22.h7 Kxd4 23.h8Q[/font] White wins.
• If [font color="magenta"]19...Kxd4 20.Kxg6[/font] then:
• If [font color="magenta"]20...Kd5 21.Bb4 Kc6 22.h7[/font] White wins.
• If [font color="darkorange"]20...Nf8+ 21.Kg7 Ne6+ 22.Kf6 Kd5 23.h7[/font]
• If [font color="darkred"]15...Kc6 16.Kf7[/font] then:
• If [font color="darkred"]16...Kd5 17.Kg8 Ke6 18.Nc4[/font] then:
• If [font color="darkred"]18...Kd5 19.Nd6 Kc6 20.Ne8 Bb3+ 21.Kxh7 Bc4 22.Kg7.[/font]
• If [font color="burgundy"]18...Ke7[/font] then White wins after [font color="burgundy"] 19.Kxh7 Kf8 20.Kxg6 Ke7 21.Kg7 Ke6 22.h7.[/font]
• If [font color="magenta"]16...Bb3+ 17.Kg7 Bd5 18.Kxh7 Nf8+ 19.Kg7[/font] then:
• If [font color="magenta"]19...Ne6+ 20.Kxg6 Be4 21.h7 Nf8+ 22.Kg7 Nxh7 23.Kxh7[/font] then:
• If [font color="magenta"]23...Bd5[/font] then after [font color="magenta"]24.g6 Bb3 25.g7 Bf7 26.g8Q Bxg8+ 27.Kxg8[/font] White wins.
• If [font color="darkorange"]23...Bf3 24.g6 Kb6[/font] then:
• If [font color="darkorange"]25.Nc2 Bc6 26.Ne3 Bd7 27.g7[/font] then:
• If [font color="darkorange"]27...Be6 28.d5 Bf7 29.d6 Kc6 30.g8Q Bxg8+ 31.Kxg8[/font] then:
• If [font color="darkorange"]31...Kd7[/font] then after [font color="darkorange"]32.Kf7 Kd8 33.Ke6 Kc8 34.d7+ Kd8 35.Bf6+.[/font]
• If [font color="burgundy"]31...Kb7[/font] then White wins after [font color="burgundy"]32.d7 Kc6 33.d8Q.[/font]
• If [font color="#C08000"]27...Bc6[/font] then White wins after [font color="#C08000"]28.g8Q Bf3 29.Qb8+ Kc6 30.Qc7+ Kb5 31.Qc5+.[/font]
• If [font color="purple"]25.g7[/font] then White wins after [font color="purple"]25...Bd5 26.g8Q Bxg8+ 27.Kxg8 Kc6 28.Nc2.[/font]
• If [font color="darkorchid"]19...Nd7[/font] then White wins after [font color="darkorchid"] 20.h7 Nxe5 21.dxe5 Kc5 22.h8Q.[/font]
• If [font color="darkred"]12.Kd6? Kxa5 13.Ke7[/font] then:
• If [font color="darkred"]13...Kb5[/font] then:
• If [font color="darkred"]14.Kf7 Kc4 15.Kg8 Nf8 16.Kxf8 Kd5 17.Kg8 Ke6 18.Kxh7 Kf7 19.d5[/font] then:
• After [font color="darkred"]19...Bb3 20.d6 Ba4 21.Bd4 Bc6 22.Kh8 Bb5 23.Bc3 Bd7[/font] White can make no progress.
• After [font color="burgundy"]19...Bd7 20.Kh8 Be8 21.Kh7 Bb5[/font] White can make no progress.
• After [font color="magenta"]14.Kxd7 Kc4+ 15.Ke6 Bb3[/font] then:
• After [font color="magenta"]16.Kf7 Kd5 17.Kg8 Ke6 18.Kxh7 Kf7[/font] White can make no progress.
• After [font color="darkorange"]16.d5 Kc5 17.Kf7 Kxd5 18.Kg7 Ke6 19.Kxh7 Kf7[/font] White can make no progress.
• If [font color="magenta"]13...Bb3 14.Kxd7 Kb6[/font] then:
• If [font color="magenta"]15.Ke7 Kc6 16.Kf8 Kd5 17.Kg7 Ke6[/font] then:
• After [font color="magenta"]18.Bf6 Bd5 19.Bd8 Bh1 20.Kxh7 Kf7 21.Ba5 Bd5[/font] White can make no progress.
• After [font color="burgundy"]18.Kg8 Ke7+ 19.Kxh7 Kf7[/font] White can make no progress.
• If [font color="darkorange"]15.Kd6 Kb7 16.Ke7 Kc6 17.Kf6[/font] then:
• After [font color="darkorange"]17...Kd7 18.Kg7 Ke7 19.Bf6+ Ke8 20.Kxh7 Kf7[/font] White can make no progress.
• After [font color="purple"]17...Kd5 18.Kg7 Ke6 19.Kg8 Ke7+ 20.Kxh7 Kf7[/font] White can make no progress.
• [font color="burgundy"]11...Ka6 12.Ke6 Ka7 13.Kf7 Kb6 14.Kg7 Kxa5 15.Kxh7[/font] gives White two passed pawns for a minor piece, one of which will queen.
• If [font color="darkred"]10...Be8 11.Kd6[/font] then:
• [font color="darkred"]11...Bb5 12.Ke7 Nd7 13.Bc7 Ka6 14.Kf7 Be2 15.Kg7[/font] wins the a-pawn and the game.
• [font color="magenta"]11...Bf7 12.Ke7 Bg8 13.Kf8 Be6 14.Kg7 Ka6 15.Kxh7[/font] gives Black no way to stop the a-pawn.

• With Black to play in the main analysis position, White's task is even easier because Black's pieces, especially the King and Bishop, are already in at optimum posts. By moving, Black can only spoil his position.
• If [font color="red"]1...Bf7 2.b5 cxb5 3.axb5 axb5 4.Kxb5[/font] then:
• If [font color="red"]4...Be8 5.Ka5 Bf7 6.Nb4[/font] then:
• If [font color="red"]6...Kd8 7.c6 bxc6 8.Nxc6+ Kc8 9.Ka6[/font] then:
• If [font color="red"]9...Be6 10.Ne7+ Kd8 11.Kb7[/font] then:
• If [font color="red"]11...Bf7 12.Nc6+ Ke8 13.Kc7[/font] then:
• If [font color="red"]13...Be6 14.Nd8 Bg8 15.Nc6 Bf7 16.Bb4[/font] then:
• If [font color="red"]16...Be6 17.Na5 Bg8 18.Nb7 Kf7[/font] then:
• If [font color="red"]19.Ba3 Ke8 20.Nd6+ Ke7 21.Bb4[/font] then:
• If [font color="red"]21...Nf8 22.Ne4+ Kf7 23.Nf6 Ke6 24.Nxg8[/font] then:
• [font color="red"]24...Nd7 25.Ba3 Nf8 26.Bxf8 Kf7 27.Nf6[/font] wins the a-pawn and the game.
• [font color="burgundy"]24...Kf7 25.Bxf8 Kxf8 26.Nf6[/font] gives White the a-pawn and the game.
• [font color="#C08000"]21...Ke6 22.Ba3 Ke7 23.Nxf5+!! Ke6 24.Nd6 Nf8 25.Kd8[/font] is an easy win for White.
• [font color="darkpink"]19.Kxd7??[/font] is stalemate.
• If [font color="#C00080"]16...Nf8[/font] then after [font color="#C00080"]17.Bxf8 Kxf8 18.Ne5 Be8 19.Kd6 Ba4 20.Kxd5[/font] White's extra pawn is enough.
• [font color="#F6358A"]13...Bg8 14.Ne7 Bf7 15.Bb4 Be6 16.Kd6 Bf7 17.Nxd5[/font] leaves White with an extra pawn sufficient for victory.
• If [font color="darkred"]11...Ke8 12.Kc7 Kf8 13.Kd8[/font] then:
• If [font color="darkred"]13...Kf7[/font] then White wins after [font color="darkred"]14.Nc8 Nf6 15.gxf6 g5 16.fxg5 Kg6 17.Ke7.[/font]
• [font color="magenta"]13...Nb8 14.Nc6+ Kg8 15.Nxb8[/font] leaves White a piece to the good.
• If [font color="darkred"]9...Be8 10.Ne7+ Kd8 11.Nc6+ Kc8[/font] then:
• If [font color="darkred"]12.Na7+ Kd8 13.Kb7 Bf7 14.Nc6+ Ke8 15.Kc7[/font] then:
• [font color="darkred"]15...Be6[/font] then White wins after [font color="darkred"]16.Ba3 Bf7 17.Na5 Bg8 18.Bb4 Be6 19.Nb7 Bg8 20.Nd6+ Ke7 21.Nc4+ Ke6.[/font]
• If [font color="burgundy"]15...Bg8[/font] then White wins after [font color="burgundy"]16.Ba3 Be6 17.Na5 Kf7 18.Nb7 Ke8 19.Bb4.[/font]
• If [font color="magenta"]12.Ka7?! Nf8[/font] then:
• If [font color="magenta"]13.Ne7+[/font] then:
• If [font color="magenta"]13...Kd8 14.Kb7 Bb5 15.Bc5[/font] then:
• If [font color="magenta"]15...Ba4 16.Nxd5 Nd7 17.Nc7[/font] then:
• If [font color="magenta"]17...Bc2 18.Ne6+ Ke8 19.Kc7[/font] then:
• [font color="magenta"]19...Ba4 20.Ba3 Bb5 21.Ng7+ Kf7[/font] leaves the Black Knight trapped.
• If [font color="darkorange"]19...Nxc5 20.dxc5 Be4 21.Kd6 Bb7 22.c6[/font] then:
• If [font color="darkorange"]22...Bc8[/font] then White wins after [font color="darkorange"]23.Nc7+ Kf8 24.Nd5 Ba6 25.Nf6 Bb5 26.c7 Ba6 27.Nxh7+.[/font]
• If [font color="purple"]22...Bxc6[/font] then White wins after [font color="purple"]23.Kxc6 ke7 24.Nd4 Kf7 25.Kd6 Kf8 26.Kd7.[/font]
• If [font color="darkorange"]17...Bb3 18.Bb4 Bc4 19.Kc6 Bd3 20.Nd5[/font] then:
• If [font color="darkorange"]20...Bc2 21.Kd6 Ba4 22.Bc3 Bb3 23.Ba5+[/font] then:
• If [font color="darkorange"]23...Ke8[/font] then after [font color="darkorange"]24.Nc7+ Kd8 25.Ne6+ Ke8 26.Ng7+ Kf7 27.Kxd7[/font] White wins.
• If [font color="purple"]20...Be4 21.Kd6[/font] then:
• If [font color="purple"]21...Ke8 22.Nc7+ Kd8 23.Ne6+[/font] then:
• If [font color="purple"]23...Kc8 24.Ng7[/font] then:
• If [font color="purple"]24...Kd8[/font] then after [font color="purple"]25.Ba5+ Kc8 26.Ne8 Nb8 27.d5 Kb7 28.Nf6[/font] White wins.
• If [font color="#C08000""]24...Bb7[/font] then White wins after [font color="#C08000""]25.Nxf5!! gxf5 26.g6 hxg6 27.h7.[/font]
• If [font color="burgundy]23...Kc8[/font] then White wins after [font color="burgundy"]24.Ne7+ Kb8 25.Kxd7.[/font]
• If [font color="hotpink"]21...Bxd5[/font] then White wins after [font color="hotpink"]22.Ba5+ Kc8 23.Kxd5 Kb7 24.Kd6 Nb8 25.d5.[/font]
• If [font color="darkorange"]15...Bc4 16.Nc6+ Ke8 17.Bxf8 Kxf8 18.Kc7[/font] then:
• If [font color="darkorange"]18...Ke8[/font] then after [font color="darkorange"]19.Kd6 Kf8 20.Ne7 Ba2 21.Nxd5 Bxd5 22.Kxd5[/font] White wins.
• If [font color="purple"]18...Bb5[/font] then White wins after [font color="purple"]19.Kd6 Bc4 20.Ne7 Ke8 21.Nxd5 Bxd5 22.Kxd5[/font]
• If [font color="darkorange"]13...Kd7 14.Ba3 Bf7[/font] then:
• If [font color="darkorange"]15.Kb6 Ne6 16.Nxd5 Nxd4 17.Nf6+ Ke6 18.Nxh7 Bg8 19.Nf8+ Kf7 20.h7 Bxh7 21.Nxh7 Nb3 22.Kb7 Nd2 23.Kc7 Ne4 24.Bd6 Kg8 25.Nf6+[/font] then:
• If [font color="darkorange"]25...Nxf6 26.gxf6 Kf7 27.Be5[/font] then:
• If [font color="darkorange"]27...Kf8 28.Kd6 Kf7 29.Kd7[/font] then:
• If [font color="darkorange"]29...g5[/font] then White wins after [font color="darkorange"]30.fxg5 Kg6 31.Ke7.[/font]
• If [font color="purple"]29...e1Q+ 30.Bxe1 Kg8 31.Kf6 Kh7 32.Bb4[/font] then:
• If [font color="purple"]32...Kg8[/font] then:
• If [font color="purple"]33.f5[/font] then [font color="purple"]33...gxf5 34.g6 Kh8 35.Kf7 f4 36.Bc3#.[/font]
• If [font color="#C08000"]33...Kg8[/font] then [font color="#C08000"]34.Kf6 Kh7 35.Bb2 Kg8 36.Ba3 Kh8 37.Kf7 Kh7 38.f5 gxf5 39.Bf8 Kh8 40.Bg7+ Kh7 41.g6#.[/font]
• If [font color="hotpink"]32...Kh8[/font] then [font color="hotpink"]33.Kxg6 Kg8 34.f5 Kh8 35.f6 Kg8 36.f7+ Kh8 37.Bc3#.[/font]
• If [font color="#c08000"]27...g5[/font] then White wins after [font color="#C08000"]28.fxg5 f4 29.Bxf4 Ke6 30.Bd6 Kf7 31.Ke7.[/font]
• If [font color="purple"]27...Kg7 28.Ke8[/font] then:
• If [font color="purple"]28...e3[/font] then [font color="purple"]29.Be5+ Kh7 30.Kf7 e2 31.Bc3 e1Q 32.Bxe1 Kh8 33.f5 gxf5 34.g6 f4 35.Bc3#.[/font]
• If [font color="hotpink"]28...Kg8[/font] then White wins after [font color="hotpink"]29.f5 gxf5 30.Bf4! e3 31.Bxe3 f4 32.Bxf4.[/font]
• If [font color="purple"]25...Kh8 26.Nxe4 fxe4 27.Kd7[/font] then:
• If [font color="purple"]27...e3 28.Ke7 e2 29.Bb4[/font] then:
• If [font color="purple"]29...Kg7 30.Ke8 e1Q+ 31.Bxe1 Kg8 32.Ke7 Kg7 33.Bc3+[/font] then:
• If [font color="purple"]33...Kh7 34.Kf6[/font] then [font color="purple"]34...Kg8 35.Bb4 Kh7 36.Kf7 Kh8 37.f5 gxf5 38.Bf8 f4 39.Bg7+ Kh7 40.g6#.[/font]
• If [font color="#C08000"]15.Nxd5? Bxd5 16.Bxf8 Kc7 17.Be7 Be4 18.Bf6 Bd5[/font] draws.
• If [font color="darkorchid"]13.Bxf8??[/font] then after [font color="darkorchid"]Bxc6 14.Kb6 Ba8[/font] neither side can make progress.
• If [font color="darkred"]6...Be6 7.c6 bxc6 8.Nxc6 Bf7 9.Ka6[/font] then:
• [font color="darkred"]9...Be8 10.Ne7+ Kd8 11.Nc6+ Kc8 12.Na7+ Kd8 13.Kb7[/font] leads to the wins of the d-pawn and victory.
• If [font color="magenta"]9...Nb8+[/font] then White wins after [font color="magenta"]10.Nxb8 Be8 11.Kb6 Kd8 12.Nc6+ Kc8 13.Ne7+[/font] when he wins the d-pawn.
• If [font color="darkred"]4...Kd8 5.Nb4 Kc8 6.c6 bxc6+ 7.Kxc6[/font] then:
• If [font color="darkred"]7...Kd8 8.Nxd5 Bxd5+ 9.Kxd5 Nb6+[/font] then:
• If [font color="darkred"]10.Ke6 Nc8 11.d5 Nb6[/font] then:
• If [font color="darkred"]12.Bc5 Nd7 13.Bg1 Ke8 14.d6 Nf8+ 15.Kf6 Kd7 16.Kf7 Ne6[/font] then:
• If [font color="darkred"]17.Kg8 Nxf4 18.Kxh7[/font] then:
• [font color="darkred"]18...Kd8 19.Bh2 Nd5 20.Kg8 Nb6 21.h7[/font] is a clear win for White.
• If [font color="burgundy"]18...Kxd6[/font] then White wins after [font color="burgundy"]19.Bh2 Ke5 20.Kg8 .[/font]
• If [font color="magenta"]17.Be3? Kxd6 18.Kg8[/font] then:
• If [font color="magenta"]18...Ke7![/font] then:
• [font color="magenta"]19.Bd2 Nc7 20.Kxh7 Kf7 21.Bc3 Nd5 22.Be5 Nb4[/font] allows neither side to make progress.
• If [font color="darkorange"]18...Kd7?[/font] then White wins after [font color="darkorange"]19.Kxh7! Nf8+ 20.Kg8 Ke7 21.Bc5+! .[/font]
• [font color="purple"]19.Kxh7 Kf7 20.Bc1 Nf8+ 21.Kh8 Ne6 22.Bd2 Nf8 etc.[/font] draws.[/font]
• If [font color="magenta"]12.Be7+ Ke8 13.d6 Nd7 14.Bf6[/font] then:
• If [font color="magenta"]14...Nf8+ 15.Kd5[/font] then:
• If [font color="darkred"]15...Kd7[/font] then:
• If [font color="magenta"]16.Bg7 Ne6 17.Be5 Nf8 18.Bb2 Kd8[/font] then:
• [font color="magenta"]19.Ke5 Kd7 20.Kf6 Ne6 21.Be5 Nc5 22.Kf7 gives White the a-pawn and the game.[/font]
• If [font color="burgundy"]19.Bg7[/font] then White wins after [font color="burgundy"]19...Nd7 20.Ke6 Nc5+ 21.Kf7 Nd7 22.Kg8 .[/font]
• If [font color="darkorange"]16.Be7[/font] then:
• If [font color="darkorange"]16...Ne6 17.Ke5 Ke8 18.Kf6 Kd7 19.Ke5 Ke8[/font] then:
• [font color="darkorange"]20.Kf6[/font] then White wins after [font color="darkorange"]Kd7 21.Kf7! Nxf4 22.Kg7 Ne6+ 23.Kxh7 .[/font]
• [font color="purple"]20.Kxe6??[/font] is stalemate.
• If [font color="hotpink"]16...Ke8[/font] then White wins after [font color=hotpink]17.Bxf8 Kxf8 18.Kc6.[/font]
• If [font color="darkorange"]14...Nc5+ 15.Kd5 Nd7 16.Kc6 Nf8[/font] then:
• [font color="darkorange"]17.Kd5 Kf7 18.Bd4 Nd7 19.Kc6 Ke8 20.Bf6 Nf8[/font] allows neither side to make progress.
• [font color="purple"]17.Bd4 Kd8 18.Kd5 Ke8 19.Kc6 Kd8 etc.[/font] draws.
• If [font color="magenta"]10.Kc6 Nc4 11.Bb4 Ke8 12.d5[/font] then:
• If [font color="magenta"]12...Kf7 13.Kc5 Nb2 14.Kc6[/font] then:
• [font color="magenta"]14...Nc4[/font] then after [font color="magenta"]15.Kb5 Ne3 16.d6 Ke6 17.Kc6 Nd5 18.Ba3 Nxf4 19.d7[/font] White's pawn queens.
• If [font color="purple"]14...Nd3[/font] then after [font color="purple"]15.Bd2 Ke7 16.d6+ Kd8 17.Ba5+[/font] White soon delivers mate.
• If [font color="darkorange"]12...Ne3[/font] then after [font color="darkorange"]13.d6 Nc4 14.d7+ Kd8 15.Bc3[/font] White soon delivers mate.
• If [font color="magenta"]7...Nb8+ 8.Bxb8 Kxb8 9.Nxd5[/font] then:
• [font color="magenta"]9...Be8+ 10.Kd6 Bf7 11.Nf6[/font] allows White to take the a-pawn and win.
• If [font color="darkorange"]9...Ka7[/font] then White wins after [font color="darkorange"]10.Nf6 Bc4 11.d5 Ka6 12.Kc5 .[/font]



• If [font color="blue"]1...Kd8 2.b5 cxb5 3.axb5 axb5 4.Nb4[/font] then:
• If [font color="blue"]4...Bf7[/font] then:
• If [font color="blue"]5.Kxb5[/font] then:
• If [font color="blue"]5...Kc8 6.c6 bxc6+ 7.Kxc6 Kd8 8.Bc5 Kc8 9.Nxd5[/font] then:
• If [font color="blue"]9...Nb8+ 10.Kd6 Bxd5 11.Kxd5 Kd7 12.Ke5 Nc6+ 13.Kf6[/font] prepares White to demolish Black's kingsie and win easily.
• If [font color="#0080C0"]9...Kd8[/font] then White wins after [font color="#0080C0"]10.Nf6 Nb8+ 11.Kd6 Ba2 12.Nxh7.[/font]
• If [font color="#8000C0"]5...Be8[/font] then White wins after [font color="#8000C0"]6.c6 bxc6+ 7.Ka5 Bf7 8.Nxc6+ Kc8 9.Ka6 Be6.[/font]
• If [font color="darkblue"]5.c6 bxc6 6.Nxc6+[/font] then:
• If [font color="darkblue"]6...Ke8 7.Kxb5 Be6 8.Nb4 Kd8 9.Kc6 Bg8[/font] then:
• If [font color="darkblue"]10.Bc5 Ke8 11.Nxd5 Bxd5+ 12.Kxd5 Kf7 13.Kd6[/font] is an easy win for White.
• If [font color="slateblue"]10.Nxd5 Bxd5+ 11.Kxd5 Nb6+ 12.Ke6 Ke8 13.Bc7 Na4 14.d5.[/font]
• If [font color="dodgerblue"]6...Kc8 7.Ka6 Be8 8.Na7+ Kd8 9.Nxb5 Bf7 10.Kb7[/font]
• If [font color="darkblue"]4...Kc8 5.Nxd5 Kd8 6.Ne7![/font] (Zugzwang!) then:
• If now [font color="darkblue"]6...Bf7 7.Kxb5 Bb3 8.d5.[/font]
• If [font color="dodgerblue"]6...b6+[/font] then White wins after [font color="dodgerblue"]7.cxb6 Nxb6 8.Kxb6 Kd7 9.Bb4.[/font]
• If [font color="darkcyan"]6...b4[/font] then White wins after [font color="darkcyan"]7.Kxb4 Bf7 8.Kb5 Be8 9.Ka5 Nf8 10.Kb6 Ne6 11.d5.[/font]

• The only move available to Black with the move from the main analysis position that is not available to him otherwise is 1...b5. It's no better than the others.
• From the main analysis position, White wins easily: 1...b5 2.Kxa6 (2.cxb6 also works, but much more slowly) 2...bxa4 3.b5 3.b5! (there's that move again) 3...cxb5 (If 3...a3 then Black is toast after 4.Nb4 cxb5 5.c6 Nb8+ 6.Bxb8 Kxb8 7.Kc6) 4.c6 Nb8+ 5.Bxb8 Bxc6 6.bd6 gives Black an extra piece; Black passed pawn are held in check by White's Bishop.
• From a slightly differendt position, with the White Knight at c3 rather than d3, we will proceed.

[center]BLACK[/center]

[center][/center]

[center]WHITE[/center][center]Position after 1...b5[/center]

• If [font color="#008000"]1...b5[/font] then:
• If [font color="#008000"]2.Kxa6! Nb8+ 3.Ka7[/font] then:
• If [font color="#008000"]3...Nd7 4.axb5 cxb5 5.Nxd5[/font] then:
• If [font color="#008000"]5...Bf7 6.Ne7+ Kd8 7.c6 Nb6 8.Kxb6[/font] then:
• If [font color="#008000"]8...Ke8 9.d5 Bxd5 10.c7 Be6 11.Kb7[/font] then:
• If [font color="#008000"]11...Bd7[/font] then after [font color="#008000"]12.Nxg6 Be6 13.Ne5 Bd5+ 14.Kb8 Be6 15.g6[/font] White wins.
• If [font color="#808000"]11...Kf8[/font] then White wins after [font color="#808000"]12.Nxg6+ Kf7 13.Nf8 Kg8 14.Nxe6.[/font]
• If [font color="#A0C080"]8...Be8[/font] then [font color="#A0C080"]9.c7+ Kd7 10.c8Q+ Kxd6 11.Qxe8 Ke6 12.d5+ Kd6 13.Qd8#.[/font]
• If [font color="#40C040"]5...Nf8 6.Nb6+ Kd8 7.Bxf8 Kc7 8.Bd6+[/font] then:
• If [font color="#40C040"]8...Kd8[/font] then [font color="#40C040"]9.d5 Bf7 10.c6 Bxd5 11.c7+ Ke8 12.c8Q+ Kf7 13.Qf8+ Ke6 14.Qe7#.[/font]
• If [font color="#60C060"]8...Kc6[/font] then [font color="#60C060"]9.d5#.[/font]
• If [font color="#40C040"]3...bxa4 4.Nxa4 Nd7 5.Ka8[/font]
• If [font color="#40C040"]5...Kd8 6.Kb7 Bf7 7.b5[/font]
• If [font color="#40C040"]7...Nxc5[/font] then after [font color="#40C040"]8.dxc5 d4 9.b6 Kd7 10.Ka7 White wins.[/font]
[lf]If [font color="#60C060"]7...cxb5 8.c6 Nb6 9.c7+ Ke8 10.Nxb6 Be6 11.Kc6[/font] then:
• If [font color="#60C060"]11...b4[/font] then after [font color="#60C060"]12.Bxb4 Kf7 13.Nd7 Bxd7+ 14.Kxd7 Kg8 15.c8Q+[/font] White delivers mate on the next move.
• If [font color="#808000"]11...Kf7 12.Nd7 Bxd7+ 13.Kxd7 b4 14.c8Q b3 15.Qe8#.[/font]
• If [font color="#60C060"]5...Bf7 6.Nb6+ Kd8 7.Kb7[/font] then:
• If [font color="#60C060"]7...Be8 8.Na4 Bf7 9.b5 Ke8 10.bxc6 Nf8 11.c7[/font] White wins.
• If [font color="#808000"]7...Nxb6[/font] then White wins after [font color="#808000"]8.cxb6 Be6 9.Ka7 Bc8 10.b7 Bxb7 11.Kxb7[/font]
• If [font color="#40C040"]2.cxb6 Kb7 3.Bc5 Bf7 4.Nd1[/font] then:
• If [font color="#40C040"]4...Be8 5.Nf2 Nb8 6.Nd3 Nd7 7.Nc1 Nb8 8.Nb3[/font] then:
• If [font color="#40C040"]8...Bf7 9.Bd6 Be8 10.Nc5+[/font] then:
• If [font color="#40C040"]10...Kc8[/font] then White wins after [font color="#40C040"]11.b7+ Kd8 12.Bxb8 Ke7 13.Be5 Bd7 14.b8Q.[/font]
• If [font color="#808000"]10...Ka8[/font] then White wins after [font color="#808000"]11.b7+ Ka7 12.Bxb8+ Kxb8 13.Kxa6 Bf7 14.Nd7+.[/font]
• If [font color="#60C060"]8...Nd7 9.Bd6 Nxb6 10.Nc5+ Ka7 11.Bb8+[/font] then:
• If [font color="#60C060"]11...Kxb8[/font] then after [font color="#60C060"]12.Kxb6 Kc8 13.Nxa6 Bd7 14.Nc5 Be8 15.a5[/font] the pawn keeps coming.
• If [font color="#00C080"]11...Ka8 12.Kxb6 Kxb8 13.Nxa6+[/font] then:
• If [font color="#00C080"]13...Kc8[/font] then after [font color="#00C080"]14.b5 Bd7 15.a5 c5 16.Nc7 cxd4 17.Nxd5[/font] White wins easily.
• If [font color="#008080"]13...Ka8 14.a5 c5 15.Nc7+ Kb8 16.Nxe8[/font] then:
• If [font color="#008080"]16...c4 17.Nc7[/font] then:
• [font color="#008080"]17...Kc8[/font] then after [font color="#008080"]18.a6 Kd8 19.a7 Kd7 20.Nxd5 Kd6 21.Nc3[/font] the a-pawn queens.
• If [font color="#808000"]17...c3[/font] then after [font color="#808000"]18.a6 c2 19.a7+ Kc8 20.a8Q+ Kd7 21.Qe8+[/font] White gives mate on the next move.
• If [font color="#80C080"]16...cxb4 17.Nc7 b3 18.a6 b2[/font] then:
• If [font color="#80C080"]18...b2[/font] then [font color="#80C080"]19.a7+ Kc8 20.a8Q+ Kd7 21.Qe8+ Kd6 22.Qd8#.[/font]
• If [font color="#808000"]18...Kc8[/font] then [font color="#808000"]19.a7 b2 20.a8Q+ Kd7 21.Qe8+ Kd6 22.Qe6#.[/font]
• If [font color="#60C060"]4...Bg8 5.Nb2[/font] then:
• If [font color="#60C060"]5...Nb8 6.Nd3 Bf7 7.Be7 Nd7 8.Bd8 Be8 9.Bc7[/font] then:
• If [font color="#60C060"]9...Bf7 10.b5 cxb5 11.axb5 axb5 12.Kxb5 Be8 13.Nc5+[/font] then:
• If [font color="#60C060"]13...Kc8 14.Ne6 Kb7 15.Ka5 Kc8 16.Ka6[/font] then:
• [font color="#60C060"]16...Nxb6 17.Kxb6 Kd7 18.Nf8+ Ke7 19.Nxh7 Ba4 20.Bd6+[/font] if the King takes the Bishop, then it will have not enough time to stop the pawn; if the King keeps going, [font color="#60C060"]20...Kf7[/font] then the pawn queens after [font color="#60C060"]21.Be5 Kg8 22.Nf8.[/font]
• If [font color="#808000"]16...Bf7[/font] then [font color="#808000"]17.b7#.[/font]
• If [font color="#00C080"]13...Nxc5+ 14.Kxc5[/font] then:
• If [font color="#00C080"]14...Ba4 15.Kxd5 Ka6 16.Ke6 Be8 17.Kf6[/font] Black cannot stop White's a-pawn from queening.
• If [font color="#808080"]14...Bc6 15.Kd6 Kc8[/font] then:
• If [font color="#808080"]16.Ke6 Ba8 17.Ke7 Bc6[/font] then:
• If [font color="#808080"]18.Bd6 Ba8 19.Be5 Bc6 20.Bc7[/font] then:
• If [font color="#008080"]20...Bd7 21.Kf7 Bc6 22.Kg7 Be8 23.Kxh7[/font] Black cannot stop White's a-pawn from queening.
• If [font color="#A0C080"]20...Ba4 21.Kd6! Be8 22.Kxd5[/font] then:
• If [font color="#A0C080"]22...Bf7+ 23.Ke5[/font] then:
• If [font color="#A0C080"]23...Kd7[/font] then:
• If [font color="#A0C080"]24.b7 Kxc7 25.b8Q+ Kxb8 26.Kf6[/font] Black cannot stop White's a-pawn from queening.
• If [font color="#808000"]23...Be8[/font] then after [font color="#808000"]24.Kf6 Bd7 25.Kg7 Be6 26.Kxh7[/font] Black cannot stop White's a-pawn from queening.
• If [font color="#60C0A0"]22...Kd7 23.b7 Kxc7 24.Ke6[/font] then:
• If [font color="#60C0A0"]24...Kxb7[/font] then after [font color="#60C0A0"]25.Ke7 Bb5 26.Kf7[/font] Black cannot stop White's a-pawn from queening.
• If [font color="#808000"]24...Bc6[/font] then after [font color="#008080"]25.b8Q+ Kxb8 26.Kf7[/font] Black cannot stop White's a-pawn from queening.
• If [font color="#80C080"]18.Kf7 Kd7 19.Kg8[/font] then:
• If [font color="#80C080"]19...Ke8 20.Be5 Bb7 21.Bg7 Bc8[/font] then:
• [font color="#80C080"]22.Kxh7 Kf7 23.Kh8 Bb7 24.Bf6 Kf8 25.Bg7+ Kf7[/font] allows White to make no progress.
• [font color="#808000"]22.Bf6 Bb7 23.Kg7 Bc8 24.Kxh7 Kf7[/font] allows White to make no progress.
• [font color="#008080"]19...Ke6 20.Be5 Bb7 21.Kg7 Ke7 22.Kxh7 Kf7 23.Kh8 Bc8[/font] allows White to make no progress.
• If [font color="#808080"]16.Kxc6??[/font] is stalemate.
• If [font color="#808000"]9...Nf8[/font] then White wins after [font color="#808000"]10.Nc5+[/font] then White wins after [font color="#206020"]10...Kc8 11.Kxa6 Nd7 12.Nxd7 Bxd7 13.b7+.[/font]
• If [font color="#00C080"]5...Be6 6.Nd3 Bg8 7.Bd6[/font] then:
• If [font color="#00C080"]7...Bf7 8.Be5 Be8 9.Bc7 Bf7 10.b5 cxb5 11.axb5 axb5 12.Kxb5[/font] then:
• If [font color="#00C080"]12...Be8 13.Nc5+ Kc8 14.Ne6 Ne5+ 15.Ka6[/font] then:
• If [font color="#00C080"]15...Nc6 16.b7+ Kd7 17.Ng7[/font] then:
• If [font color="#00C080"]17...Kxc7[/font] then White wins after [font color="#00C080"]18.Nxe8+ Kb8 19.Nf6 Na5 20.Kxa5 Kxb7 21.Nxh7!.[/font]
• If [font color="#60A060"]17...Ke7 18.Nxe8 Kxe8 19.Kb6 Kd7 20.Be5 Nxe5 21.fxe5.[/font]
• If [font color="#80C080"]15...Bc6[/font] then White wins after [font color="#40C020"]16.fxe5 f4 17.Nxf4 Kd7 18.e6+.[/font]
• If [font color="#008080"]12...Bg8 13.Nc5+ Kc8 14.Nxd7 Kxd7 15.Be5 Be6 16.b7.[/font]
• If [font color="#808000"]7...Nxb6 8.Nc5+ Ka7 9.Bb8+ Kxb8 10.Kxb6 Kc8 11.Nxa6.[/font]

• Black is very accommodating. He allows White to complete the infiltration of the Bishop with tempo, which is then used to seal off the kingside.
• If [font color="red"]38...Nf8 39.Bd6 Ne6 40.f4 Ke8 41.Kg3[/font] accomplishes steps 1 and 2 of the plan and leaves the most difficult step ahead.

• White completes teps 1 and 2.

• White immediately begins the King's journey to the queenside.

• After [font color="red"]41...Bd7[/font] White sticks to his plan: [font color="red"]42.Kf3 Bc8 43.Ke3 Bd7 44.Kd3 Be8 45.Be5 etc.[/font]

• White makes the bases of his pawn chains more secure.

[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Arkadij Naiditsch[/center][center]Position after 42...Kd7c8[/center]

• More consistant is 43.Kf3, beginning the King's journey to the queeside.
• If [font color="red"]43.Kf3 Bf7 44.Ke3 Kd8[/font] then:
• If [font color="red"]45.Nc3! Ke8 46.Na4[/font] then:
• If [font color="red"]46...Nf8 47.Bd6 Nd7 48.Kd3 Kd8 49.Kc3[/font] then:
• If [font color="red"]49...Be6 50.Kb4 Bg8 51.Ka5 Bf7[/font] then:
• If [font color="red"]52.b4[/font] then:
• If [font color="red"]52...Kc8[/font] then after [font color="red"]53.Nb2 Be8 54.a4 Bf7 55.Nd3 Be8 56.b5![/font] White wins (QED)
• [font color="burgundy"]52.Nc3 Be8 53.a4 Kc8 54.b4 b5 55.Kxa6![/font] White wins [font color="008000"](QED).[/font]
• If [font color="#C08000"]52...Be6[/font] then:
• If [font color="#C08000"]53.Nc3 Kc8 54.a4 Bf7 55.b5![/font] White wins QED
• After [font color="darkorchid"]53.Nc3 Be8 54.a4 b5 55.Kxa6[/font] White wins (QED).
• If [font color="darkpink"]49...a5 50.Nb6 Nxb6 51.cxb6 Kc8 52.Bc5 Be8 53.Kb3[/font] gives White a big advantage as Black's a-pawn falls.
• If [font color="darkred"]46...b5 47.cxb6! Nd8 48.Nc5 Ke7[/font] then:
• If [font color="darkred"]49.a4 Ke8 50.Bf6 Bg8 51.a5[/font] then:
• If [font color="darkred"]51...Bf7 52.Bxd8 Kxd8 53.Nb7+[/font] then:
• If [font color="darkred"]53...Ke7[/font] then after [font color="darkred"]54.Nc5 Ke8 55.b7[/font] the pawn queens.
• If [font color="burgundy"]53...Kc8 54.Nd6+[/font] wins the Bishop
li]If [font color="darkpink"]51...Nb7 52.Nxb7 Be6 53.Nd6+ Kd7 54.b4 Bg8 55.Nb7[/font] White wins.
• If [font color="magenta"]49.Bf6+ Ke8 50.Bxd8 Kxd8 51.Nxa6 Kc8 52.a4[/font] then:
• If [font color="magenta"]52...Kb7[/font] then [font color="magenta"]53.Nc5+ Kxb6 54.Nd7+ Ka5 55.Nc5 Kb6 56.Nd7+[/font] wins easily.
• If [font color="darkorange"]52...Be6 53.Nc5 Bd7 54.a5 Be8 55.a6 Kb8 56.a7+[/font] then:
• If [font color="darkorange"]56...Ka8 57.Kd3 Bd7 58.Kc3[/font] then:
• If [font color="darkorange"]58...Be8 59.Ne6 Kb7[/font] then:
• If [font color="darkorange"]60.Nc7[/font] then [font color="darkorange"]60...Kxb6 61.a8Q Bd7 62.Qb8+ Ka5 63.b4+ Ka4 64.Qa7#.[/font]
• If [font color="burgundy"]60.Nc5+ Ka8 61.Kb4 Bd7 62.Ka5[/font] then [font color="burgundy"]62...Be6 63.b3 Bd7 64.Na6 Kb7 65.Nc7 Be8 66.a8Q#.[/font]
• If [font color="#C08000"]62...Bc8 63.b3 Ba6[/font] then:
• If [font color="#C08000"]64.Nxa6![/font] then [font color="#C08000"]64...Kb7 65.Nc7 Kc8 66.a8Q+[/font] is a very clear win.
• [font color="hotpink"]64.Kxa6??[/font] is stalemate.
• If [font color="purple"]58...Bc8 59.Kb4[/font] then:
• If [font color="purple"]59...Bb7[/font] then [font color="purple"]60.Ka5 Bc8 61.b7+ Kxa7 62.bxc8B Kb8 63.Bxf5 gxf5 64.g6[/font] White wins.
• If [font color="hotpink"]59...Bd7[/font] then [font color="hotpink"]60.Ka5 Bc8 61.Na6[/font] White gives mate in two moves.
• If [font color="darkpink"]56...Kc8[/font] then [font color="darkpink"]57.a8Q#.[/font]
• If [font color="darkred"]45.Kd3 Be8[/font] then:
• If [font color="darkred"]46.Kc3 Nf8 47.Kb4 Bd7 48.a4 Be8[/font] then:
• If [font color="darkred"]49.Nc1 Nd7 50.Bd6 Bf7[/font] then:
• If [font color="darkred"]51.Ka5[/font] then [font color="darkred"]Be8 52.Nd3 Kc8 53.b4 Kd8 54.b5![/font] White wins (QED)
• If [font color="burgundy"]51.Nd3[/font] then [font color="burgundy"]51...Be8 52.Ka5 Kc8 53.b4 Kd8 54.b5![/font] White wins QED
• [font color="darkpink"]49.Ka5 Kc8 50.b4 Bf7 51.Kb6 Be8 52.Ka7[/font] gives White a very strong position.
• If [font color="magenta"]46.Bd6 Bd7 47.Kc3 Be8 48.Kb4 Kc8 49.Ka5[/font] then:
• If [font color="magenta"]49...Bd7[/font] then [font color="magenta"]50.Be5 Nd8 51.Kb6 Be8 52.Nc3 a5 53.Na4 Nf7[/font] White wins.
• If [font color="darkorange"]49...b5[/font] then:
• If [font color="darkorange"]50.Kxa6 Kd8 51.b3 Bd7 52.a4 bxa4 53.bxa4[/font] then:
• If [font color="darkorange"]53...Be8 54.Kb7 Bd7 55.a5[/font] then:
• If [font color="darkorange"]55...Bc8+ 56.Kb6 Ke8 57.a6 Bxa6 58.Kxa6[/font] then:
• If [font color="darkorange"]58...Kd7 59.Kb6 Nd8 60.Nc1 Kc8 61.Nd3 Nb7 62.Be7[/font] then:
• If [font color="darkorange"]62...Na5[/font] then [font color="darkorange"]63.Nb4 Kd7 64.Kxa5 Kxe7 65.Nxc6+ Kd7 66.Kb6[/font] White wins.
• If [font color="burgundy"]62...Kb8[/font] then [font color="burgundy"]63.Bd6+ Kc8 64.Ne5 Nd8 65.Be7 Ne6 66.Nxc6[/font] White wins.
• If [font color="#C08000"]58...Nd8 59.Kb6 Kd7 60.Nc1[/font] then:
• If [font color="#C08000"]60...Ke6[/font] then [font color="#C08000"]61.Nd3 Kd7 62.Ne5+ Ke8 63.Bc7 Ne6 64.Nxc6[/font] White wins.
• If [font color="darkpink"]60...Ne6 61.Nb3 Nd8 62.Na5 Ne6 63.Nxc6[/font] White wins.
• If [font color="burgundy"]55...Nf8[/font] then [font color="burgundy"]56.Bc7+ Ke8 57.a6 Ke7 58.a7 Bc8+ 59.Kxc8 Ne6 60.a8Q[/font] White wins.
• If [font color="purple"]53...Bc8+ 54.Kb6 Bd7 55.a5 Bc8 56.a6 Bxa6 57.Kxa6[/font] then:
• If [font color="purple"]57...Kd7 58.Kb6 Nd8 59.Bc7 Ne6 60.Be5 Nd8 61.Bc7[/font] then:
• If [font color="purple"]61...Ne6 62.Be5[/font] then:
• If [font color="purple"]62...Kc8[/font] then [font color="purple"]63.Kxc6 Nd8+ 64.Kxd5 Kd7 65.Kc4 Kc6 66.d5+[/font] White wins.
• If [font color="hotpink"]62...Nd8 63.Ng1[/font] then:
• If [font color="hotpink"]63...Ne6[/font] then [font color="hotpink"]64.Nf3 Nf8 65.Bd6 Ne6 66.Ne5+[/font] then:
• If [font color="hotpink"]66...Ke8[/font] then [font color="hotpink"]67.Nxc6 Kd7 68.Ne5+ Ke8 69.c6 Kd8 70.Nxg6[/font] White wins.
• If [font color="darkpink"]66...Kc8[/font] then [font color="darkpink"]67.Nxc6 Kd7 68.Be5 Ke8 69.Nb8 Kd8 70.Kb7[/font] White wins.
• If [font color="burgundy"]63...Kc8 64.Nf3 Kd7 65.Nh4 Ke8 66.Nxg6[/font] then:
• If [font color="burgundy"]66...hxg6 67.h7 Nf7 68.Kxc6[/font] then:
• If [font color="burgundy"]68...Kd8[/font] then [font color="burgundy"]69.Kxd5 Ke8 70.Ke6 Nd8+ 71.Kf6[/font] White wins.
• If [font color="#C08000"]68...Nxe5+[/font] then [font color="#C08000"]69.fxe5 f4 70.Kd6 f3 71.Ke6 f2 72.h8Q#.[/font]
• If [font color="darkpink"]66...Kf7 67.Nh4 Ke8 68.Bc7 Ne6 69.Nxf5 Kf7 70.Kxc6[/font] White wins.
• If [font color="hotpink"]61...Nf7 62.Kb7[/font] then:
• If [font color="hotpink"]62...Ke6 63.Kxc6 Ke7 64.Nc3 Nxh6 65.gxh6 g5 66.fxg5[/font] White wins.
• If [font color="burgundy"]62...Nh8 63.Nc1 Nf7 64.Ne2[/font] then:
• If [font color="burgundy"]64...Nh8 65.Nc3 Nf7 66.Na4 Nh8 67.Nb6+ Ke6 68.Kxc6[/font] White wins.
• If [font color="#C08000"]64...Nxh6 65.gxh6 Ke8 66.Kxc6 Ke7 67.Kxd5 Kd7 68.Bd6[/font] White wins.
• If [font color="hotpink"]57...Nc7+ 58.Bxc7+ Kxc7 59.Nc3[/font] then:
• If [font color="hotpink"]59...Kb8[/font] then [font color="hotpink"]60.Kb6 Ka8 61.Kxc6 Ka7 62.Kd7 Kb7 63.c6+[/font] White wins.
• If [font color="burgundy"]59...Kc8 60.Kb6 Kd7 61.Na4 Kc8 62.Kxc6[/font] then:
• If [font color="burgundy"]62...Kb8[/font] then [font color="burgundy"]63.Nb6 Ka7 64.Kxd5 Kb8 65.Kc6 Ka7 66.d5[/font] White wins.
• If [font color="#C08000"]62...Kd8[/font] then [font color="#C08000"]63.Kb7 Kd7 64.c6+[/font] White wins.
• If [font color="purple"]50.cxb6 Kb7 51.a4 Bf7 52.Bc5[/font] then:
• If [font color="purple"]52...Be8 53.Kb4 Kc8 54.a5 Kb7 55.Bd6[/font] then:
• If [font color="purple"]55...c5+ 56.dxc5 Bb5 57.Nc1 Nd8 58.Nb3[/font] then:
• If [font color="purple"]58...Be2 59.Nd4 Nc6+ 60.Nxc6 Kxc6 61.Kc3[/font] then:
• If [font color="purple"]61...Kb7 62.Kd4 Bc4 63.Ke5[/font] then:
• If [font color="purple"]63...Kc6 64.Kf6 d4 65.Be5 Bd5 66.Bxd4 Kb5 67.Kg7[/font] White will queen the h-pawn.
• If [font color="#C08000"]63...Bb3[/font] then after [font color="#C08000"]64.Kf6 d4 65.Be5 d3 66.Bc3 Bg8 67.Kg7[/font] Black cannot stop White from queening the h-pawn.
• If [font color="darkpink"]61...Bc4[/font] then [font color="darkpink"]62.b4 Bf1 63.Kd4 Bg2 64.b5+ axb5 65.a6[/font] allows White to queen both the a- and b-pawns.
• If [font color="hotpink"]58...Bd7 59.Nd4 Nc6+ 60.Nxc6 Bxc6 61.Kc3[/font] then:
• If [font color="hotpink"]61...Bb5 62.Kd4 Bc6 63.b4 Kc8 64.Ke5[/font] then:
• If [font color="hotpink"]64...Kd7 65.b5[/font] then:
• If [font color="hotpink"]65...axb5 66.a6 Kc8 67.b7+ Bxb7 68.axb7+ Kxb7 69.Kxd5[/font] then:
• If [font color="hotpink"]69...Ka6[/font] then after [font color="hotpink"]70.c6 Kb6 71.Bb4 Kc7 72.Ba5+ Kc8 73.Kd6[/font] White wins.
• If [font color="burgundy"]69...Kc8[/font] then after [font color="burgundy"]70.c6 Kd8 71.Be5 Kc8 72.Kd6 Kd8 73.c7+[/font] White wins by using the King to capture the b-pawn and forcing Black to give way to the c-pawn.
• If [font color="#C08000"]65...Bxb5[/font] then White wins after [font color="#C08000"]66.b7.[/font]
• If [font color="burgundy"]64...Kb7 65.Bf8[/font] then:
• If [font color="burgundy"]65...Ba4 66.Kxd5 Bc6+ 67.Ke6 Kc8 68.Bd6[/font] then:
• If [font color="burgundy"]68...Kb7[/font] then after [font color="burgundy"]69.Kf7 Bd5+ 70.Kg7 Bg2 71.Kxh7[/font] the h-pawn queens.
• If [font color="#C08000"]68...Bb7 69.Kf7 Kd7 70.Kg8 Ke8 71.b5 axb5 72.a6[/font] then:
• If [font color="#C08000"]72...Bc6[/font] then after [font color="#C08000"]73.b7 Kd7 74.b8Q[/font] wins for White.
• If [font color="#602020"]72...Bxa6 73.c6 b4 74.Bxb4 Kd8 75.b7[/font] White queens the b-pawn, for example 75...Kc7 76.Bc6+ Kxc6 77.b8Q+.
• If [font color="#C08000"]65...Ka8 66.Kd6 Bb7 67.Bg7 Kb8 68.c6[/font] then:
• If [font color="#C08000"]68...d4[/font] then White soon gives mate after [font color="#C08000"]69.Kd7 Bc8+ 70.Kd8 Bb7 71.Be5+ Ka8 72.Kc7.[/font]
• If [font color="#FF0080"]68...Kc8[/font] then [font color="#FF0080"]69.cxb7+ Kb8 70.Kc6 d4 71.Be5#.[/font]
• If [font color="darkpink"]61...Bd7[/font] then after [font color="darkpink"]62.Kd4 Kc6 63.b4 Bc8 64.Ke5 Bb7 65.Kf6[/font] Black cannot stop White from queening at least one pawn.
• If [font color="hotpink"]55...Nd8 56.Nc1 Kc8 57.Be5 Bd7 58.Nb3[/font] then:
• If [font color="hotpink"]58...c5+ 59.Kxc5 Ba4 60.Na1[/font] then:
• If [font color="hotpink"]60...Be8 61.Kxd5 Bc6+ 62.Kd6 Bh1 63.Ke7[/font] then:
• If [font color="hotpink"]63...Bc6 64.Kf8 Kd7 65.Nb3 Ne6+ 66.Kg8 Kc8 67.Kxh7[/font] White must queen at least one pawn.
• If [font color="darkpink"]63...Bd5[/font] then after [font color="darkpink"]64.Kf8 Ne6+ 65.Kg8 Nxg5+ 66.Kh8 Nf7+ 67.Kxh7[/font] White must queen at least one pawn.
• If [font color="#C08000"]60...Nb7+ 61.Kxd5 Kd7 62.b4[/font] then:
• If [font color="#C08000"]62...Nd8 63.Kc5 Kc8 64.d5 Bb5 65.Bc7 Nb7+ 66.Kd4[/font] then:
• If [font color="#C08000"]66...Ba4[/font] then after [font color="#C08000"]67.Ke5 Kd7 68.Kf6 Bb5 69.d6 Ba4 70.Kf7[/font] then:
• If [font color="#C08000"]70...Nxd6+ 71.Bxd6 Kxd6 72.b7 Kc7 73.Kg7 Kxb7 74.Kxh7[/font] White will queen at least one pawn.
• If [font color="#FF0080"]70...Bc6[/font] then:
• If [font color="#FF0080"]71.Nb3[/font] then White wins after [font color="#FF0080"]71...Nd6+ 72.Bxd6 Kxd6 73.Nc5 Ba8 74.b7.[/font]xxx
• If [font color="#FF8040"]71.Kg8 Ke6 72.Kxh7[/font] then:
• If [font color="#FF8040"]72...Kf7[/font] then after [font color="#FF8040"]73.Nb3 Be8 74.Nc5 Bc6 75.Nxb7 Bxb7 76.d7[/font] White will queen the d-pawn.
• If [font color="#C040C0"]72...Kd5[/font] then after [font color="#C040C0"]73.Nb3 Be8 74.Nc5 Kc6 75.Nxb7 Kxb7 76.Kg7[/font] the h-pawn will queen.
• If [font color="#602020"]66...Bd7[/font] then [font color="#602020"]67.Nb3 Be8 68.Ke5 Bb5 69.Nc5 Bf1 70.d6 Bg2 71.d7#.[/font]
• If [font color="#FF00A0"]62...Bc6+ 63.Kc4 Nd8 64.d5 Ba4 65.Kc3 Bd1 66.Nb3[/font] Black must either exchange on b3 or allow the White Knight into Black's territory.
• If [font color="burgundy"]58...Ne6[/font] then after [font color="burgundy"]59.Nc5 Nxc5 60.Kxc5 Kb7 61.Kd6 Be8 62.b4[/font] White maneuvers his King to the kingside and queens the h-pawn.
• If [font color="hotpink"]52...Nd8 53.Kb4 Be8 54.Nc1[/font] then:
• If [font color="hotpink"]54...Kc8 55.Be7 c5+ 56.Kxc5 Nc6 57.Bf6 Na5 58.Kxd5 Kd7 59.Nd3 Bf7+ 60.Kc5 Nb7+ 61.Kb4[/font] then:
• If [font color="hotpink"]61...Bg8[/font] then after [font color="hotpink"]62.Be5 Bf7 63.Bc7 Kc8 64.Nc5 Nxc5 65.dxc5[/font] White wins.
• If [font color="#602020"]61...Be8[/font] then after [font color="#602020"]62.Nc5+ Kc6 63.Nxb7 Kxb7 64.a5 Bd7 65.Kc5[/font] White wins.
• If [font color="burgundy"]54...Bd7 55.Nb3 Bc8 56.a5 Nf7 57.Be7[/font] then:
• If [font color="burgundy"]57...Kb8 58.Bf6 Bd7 59.Kc5 Kc8 60.Nd2[/font] then:
• If [font color="burgundy"]60...Be8 61.Nf3 Bd7 62.Nd2 Be8 63.Nf3 Kb8 64.Ne5[/font] then:
• If [font color="burgundy"]64...Nxe5 65.Bxe5+ Kb7 66.Kd6 c5 67.dxc5 Ba4 68.Ke7[/font] then:
• If [font color="burgundy"]68...Bb3[/font] then after [font color="burgundy"]69.Kf6 Kc6 70.Kg7 Kd7 71.Kxh7 Ke7 72.Kg7[/font] White queens at least one pawn.
• If [font color="#602020"]68...Bc6 69.Kf7 Bd7 70.Kg7 Be6 71.Kxh7 d4 72.Bxd4 Kc6 73.Kg7[/font] the h-pawn must queen.
• If [font color="#F6358A"]64...Kb7 65.Nxf7 Bxf7 66.Kd6 c5 67.dxc5 Be8 68.Ke7[/font] the Bishop must run to the queenside after which White maneuvers the King to the kingside and queens the h-pawn.
• If [font color="#C08000"]60...Be6 61.Kxc6 Bd7+ 62.Kxd5[/font] then:
• If [font color="#C08000"]62...Kb7 63.Nc4 Kb8 64.Ne5 Nxe5[/font] then:
• If [font color="#C08000"]65.dxe5 Bb5 66.Kd6[/font] then:
• If [font color="#C08000"]66...Kc8 67.e6 Bf1 68.e7 Bb5 69.Be5[/font] then:
• If [font color="#C08000"]69...Ba4[/font] then after [font color="#C08000"]70.Ke6 Bb3+ 71.Kf6 Ba4 72.Kg7 Be8 73.Kxh7[/font] the h-pawn will queen.
• If [font color="#FF0080"]69...Kb7 70.Ke6 Kc8 71.Kf7 Kb7 72.Kg7 Be8 73.Kxh7[/font] White will queen the h-pawn.
• If [font color="#602020"]66...Ba4 67.e6 Bb5 68.Ke7 Bc4 69.Kf7 Kb7 70.Kg7[/font] Black cannot stop White from queening the h-pawn.
• If [font color="#F6358A"]65.fxe5 Ba4 66.e6 f4 67.Be5+ Kb7 68.Bxf4 Be8 69.Kd6[/font] gives White three passed pawns.
• If [font color="darkpink"]62...Bb5 63.Ke6 Nd8+ 64.Bxd8 Kxd8 65.d5[/font] then:
• If [font color="darkpink"]65...Bd7+ 66.Kf7 Ba4[/font] then:
• If [font color="darkpink"]67.b7[/font] then after [font color="darkpink"]Kc7 68.Kg7 Be8 69.Kxh7[/font] at least one of White passers must queen.
• After [font color="#602020"]67.d6 Be8+ 68.Kg8 Bc6 69.Kxh7 Kd7 70.Kg7[/font] one of White's passers will queen.
• If [font color="#F6358A"]65...Kc8 66.Kf7 Bc4 67.Kg7 Bxd5 68.Kxh7 Kb7 69.Kg7[/font] the h-pawn will queen.
• If [font color="#C08000"]57...c5+ 58.dxc5 Bd7 59.Nd4 Nh8 60.Bd8[/font] then:
• If [font color="#C08000"]60...Bc6[/font] then after [font color="#C08000"]61.Nxc6 Nf7 62.Bf6 Kxc6 63.Kc3 Kxc5 64.b7[/font] the pawn queens.
• If [font color="darkpink"]60...Nf7 61.Bf6 Be8 62.Ne6 Bd7 63.Nf8 Be8 64.Nxh7[/font] gives White three passers.

• The Knight will add pressure to the kingside and hinder any Black advance until the White King arrives.

• If [font color="red"]45...Kd8 46.Kf3 Kc8 47.Ke3 Bf7 48.Kd3 Be6 49.Kc3[/font] then:
• If [font color="red"]49...Bf7 Be8 49.Kd3[/font] then:
• If [font color="red"]49...b6[/font] then after [font color="red"]52.Nc3 Be8 53.a4 Bf7 54.b4 Be8 55.b5![/font] White wins QED
• If [font color="darkred"]51...Nb8 52.Nb6+ Kd8 53.Bxb8 Ke8 54.Na4[/font] then:
• If [font color="darkred"]54...Bd7 55.Kb6 Kd8 56.Nc3 Bc8 57.b4 Ke8 58.a4[/font] then:
• If [font color="darkred"]58...Kd7[/font] then after [font color="darkred"]59.b5 axb5 60.axb5 cxb5 61.Nxb5 Kd8 62.Bc7+ Kd7 63.Nd6[/font] allows White to win easily.
• If [font color="burgundy"]58...Kd8[/font] then after [font color="burgundy"]59.b5 axb5 60.axb5 cxb5 61.Nxb5 Bd7 62.Na7[/font] White wins easily.
• If [font color="magenta"]54...Kd8 55.Kb6 a5 56.Be5[/font] then:
• [font color="magenta"]56...Bd7 57.Ka7 Ke7 58.Nb6 Be8 59.Kxb7 a4 60.Nxa4.[/font]
• If [font color="darkorange"]a) 56...Kd7 57.Kxb7 Bf7 58.Nb6+[/font] then:
• If [font color="darkorange"]58...Ke6[/font] then after [font color="darkorange"]59.Kc7 Ke7 60.Bf6+ Kf8 61.Nd7+ Kg8 62.Kxc6[/font] the c-pawn cannot be stopped.
• If [font color="purple"]58...Ke8[/font] then White wins after [font color="purple"]59.Bf6 a4 60.Kxc6 a3 61.bxa3 Be6 62.Kd6.[/font]
• If [font color="darkorange"]b) 56...Ke7 57.Bf6+ Kd7 58.Kxb7 Bf7 59.Nb6+[/font] then:
• If [font color="darkorange"]59...Ke6[/font] then White gives mate soon after [font color="darkorange"]60.Kc7 Be8 61.Kd8 Kf7 62.Nc8 Bd7 63.Kxd7.[/font]
• If [font color="purple"]59...Ke8[/font] then White wins after [font color="purple"]60.Kxc6 Kf8 61.Nd7+ Kg8 62.Kd6 Be8 63.c6[/font]
• If [font color="darkred"]49...a5 50.Nb6+ Nxb6 51.cxb6[/font] then:
• If [font color="darkred"]51...Bg8[/font] then [font color="darkred"]52.Kb3 Bf7 53.Ka4 Kd7 54.Bc5 Be6 55.Kxa5[/font] wins for White.
• If [font color="magenta"]51...Bd7[/font] then [font color="magenta"]52.Bc5 Kb8 53.Kb3 Bc8 54.Ka4 Be6 55.Kxa5[/font] wins.

• The King resumes its migration to the queenside.

• If [font color="red"]46...Kd8 47.Ke3[/font] then:
• If [font color="red"]47...Kc8[/font] then:
• After [font color="red"]48.b3 Be8 49.Kd3 b6 50.cxb6 Kb7 51.Kc3[/font] White wins.
• If [font color="darkred"]48.Kd3[/font] then:
• If [font color="darkred"]48...Be8[/font] then after [font color="darkred"]49.Kc3 Bf7 50.Kb4 Be6 51.Ka5 Bf7 52.b4 Kd8 53.Nc3 Kc8 54.a4 Be8 55.b5![/font] White wins (QED).
• If [font color="magenta"]48...b6 49.cxb6 Kb7 50.Kc3[/font] then:
• If [font color="magenta"]50...Nxb6 51.Nc5+ Kc8 52.Nxa6 Na4+ 53.Kb3[/font] then:
• If [font color="magenta"]53...Kb7 54.Kxa4 Kxa6 55.Bc5[/font] then:
• If [font color="magenta"]55...Kb7 56.Kb4 Kc7 57.Be7 Kd7 58.Bf6[/font] then:
• If [font color="magenta"]58...Be8 59.Kc5 Kc8 60.Kd6 c5 61.Ke7 Ba4 62.dxc5[/font] then:
• If [font color="magenta"]62...Bc6 63.Kf8 Kd7 64.Kf7 Ba4 65.b3[/font] then:
• If [font color="magenta"]65...Bb5[/font] then after [font color="magenta"]66.a4 Be2 67.Kg7 Bh5 68.Kxh7 Kc6 69.Kg7[/font] White wins.
• If [font color="burgundy"]65...d4[/font] then [font color="burgundy"]66.bxa4 d3 67.Bc3[/font] is an easy win for White.
• If [font color="darkorange"]62...d4 63.Bxd4 Kc7 64.Kf7[/font] then:
• If [font color="darkorange"]64...Bd7[/font] then after [font color="darkorange"]65.Kg7 Kc6 66.b4 Kb5 67.Kxh7 Be8 68.Kg7[/font] White wins.
• If [font color="purple"]64...Kc6[/font] then after [font color="purple"]65.Kg7 Bb5 66.Kxh7 Kd5 67.Be5 Be8 68.Kg7[/font] White wins.
• If [font color="darkorange"]58...Kc7 59.Kc5[/font] then:
• If [font color="darkorange"]59...Be6[/font] then White wins after [font color="darkorange"]60.a4 Bc8 61.Be5+ Kb7 62.Kd6[/font] then:
• If [font color="darkorange"]62...Kb6[/font] then after [font color="darkorange"]62...Ka8 63.Ke7 Kb7 64.Kf7 c5 65.dxc5 d4 66.Bxd4[/font] White has an easy win.
• If [font color="purple"]59...Be8 60.a4 Kb7 61.b4 Kc7 62.Be5+[/font] then:
• If [font color="purple"]62...Kb7[/font] then White wins after [font color="purple"]63.Kd6 Kc8 64.a5 Kb7 65.Ke7 c5 66.dxc5[/font] White wins.
• If [font color="hotpink"]62...Kc8 63.Kb6 c5 64.dxc5[/font] then:
• If [font color="hotpink"]64...Bxa4[/font] then White wins after [font color="hotpink"]65.b5 d4 66.Bxd4 Kd7 67.c6+ Kc8 68.Kc5[/font] White wins.
• If [font color="burgundy"]64...Kd8 65.a5 d4 66.a6[/font] then:
• If [font color="burgundy"]66...d3[/font] then White wins after [font color="burgundy"]67.a7 Ke7 68.a8Q d2 69.Bf6+ Kf7 70.Qd5+[/font] White wins.
• If [font color="darkpink"]66...Bf7[/font] then White wins after [font color="darkpink"]67.a7 Bd5 68.c6 Be6 69.a8Q+ Bc8 70.Qa7.[/font]
• If [font color="darkorange"]55...Be8 56.Kb4[/font]
• If [font color="darkorange"]56...Bd7 57.Be7 Bc8 58.Kc5 Kb7 59.Bf6 Kc7 60.Be5+[/font]
• If [font color="darkorange"]60...Kb7 61.Kd6 c5 62.dxc5 Ka6 63.c6[/font] then:
• If [font color="darkorange"]63...Kb5[/font] then after [font color="darkorange"]64.Kxd5 Kb6 65.Kd6 Ka7 66.c7 Kb7 67.Ke7[/font] then White wins.
• If [font color="burgundy"]63...Kb6[/font] then White wins after [font color="burgundy"]64.Bd4+ Ka6 65.Kc5 Ka7 66.b4 Ba6 67.b5.[/font]
• If [font color="hotpink"]60...Kd8[/font] then after [font color="hotpink"]61.a4 Ba6 62.Kxc6 Kc8 63.Kb6 Bb7 64.a5[/font] White wins.
• If [font color="purple"]56...Kb7[/font] then White wins after [font color="purple"]57.Be7 c5+ 58.Kxc5 Bc6 59.Bd6 Ba4 60.Kxd5.[/font]
• If [font color="darkorange"]53...Nb6 54.Nc5[/font] then:
• If [font color="darkorange"]54...Nd7 55.Kb4 Nb6 56.a4[/font] then:
• If [font color="darkorange"]56...Kd8 57.a5 Nc8 58.Nb7+ Kd7 59.Be5[/font] then:
• If [font color="darkorange"]59...Na7 60.Nd6 Kc7 61.Kc5 Be6 62.a6[/font] then:
• If [font color="darkorange"]62...Kd8[/font] then White wins after [font color="darkorange"]63.Kb6 c5 64.Kxa7 Kc7 65.Nb7+ Kc6 66.Kb8.[/font]
• If [font color="burgundy"]62...Bc8[/font] then after [font color="burgundy"]63.Nxc8+ Kxc8 64.Kb6 Nb5 65.Kxc6 Na7+ 66.Kc5[/font] White brings up the b-pawn and wins.
• If [font color="darkpink"]59...Be8[/font] then [font color="darkpink"]60.a6 Ke6 61.Kc5 Ke7 62.Nd6 Bd7 63.Nxc8+[/font] allows Black to stop the a-pawn after 63...Bxc8 64.a7 Bb7 65.Kb6 Ba8, but then White brings up the b-pawn.
• If [font color="purple"]56...Nc4 57.Be5 Bg8 58.a5[/font] then:
• If [font color="purple"]58...Nxe5 59.dxe5 Kb8 60.a6 Ka8 61.Ka5 Ka7 62.e6[/font] White wins.
• If [font color="hotpink"]58...Bf7[/font] then White wins after [font color="hotpink"]59.a6 Be8 60.a7 Nb6 61.Ka5 Na8 62.Ka6.[/font]
• If [font color="purple"]54...Bg8 55.Be5 Nc4 56.a4[/font] then:
• If [font color="purple"]56...Kd8 57.Kc3 Na5 58.b3 Kc8 59.Kb4[/font] then:
• If [font color="purple"]59...Nb7 60.a5 Be6 61.a6[/font] then:
• If [font color="purple"]61...Nxc5[/font] then White wins after [font color="purple"]62.Kxc5 Bf7 63.Kxc6 Be8+ 64.Kb6 Ba4 65.a7.[/font]
• If [font color="#C08000"]61...Na5[/font] then [font color="#C08000"]62.a7 Kd8 63.a8Q+ Ke7 64.Bd6+ Kf7 65.Qf8#.[/font]
• If [font color="burgundy"]59...Be6[/font] then after [font color="burgundy"]60.Kxa5 Bd7 61.Kb6 Kd8 62.Nxd7 Kxd7 63.a5[/font] White will queen the a-pawn.
• If [font color="hotpink"]56...Na5+ 57.Kb4 Nc4 58.a5 Nxe5 59.dxe5[/font] transposes into the [font color="purple"]note to Black's 56th move at move 59.[/font]
• If [font color="darkorange"]50...Bg8 51.Bc7 Ka8 52.Kb4[/font] then:
• If [font color="darkorange"]52...Be6 53.Bd8 Kb8 54.Ka5 Kb7 55.Bc7 Bg8 56.Bd6 Bf7[/font] then:
• If [font color="darkorange"]57.Nc5+ Nxc5 58.Bxc5 Be6 59.b3 Bc8 60.Bf8[/font] then:
• If [font color="darkorange"]60...Ka8 61.Kb4 Bd7 62.Kc5 a5[/font] then:
• If [font color="darkorange"]63.Kd6 Bc8 64.Kxc6[/font] then:
• If [font color="darkorange"]64...Be6 65.Bd6 Bc8 66.Kc7 Ba6 67.a4 Bb7 68.Ba3[/font] then:
• If [font color="darkorange"]68...Ba6 69.Kd6 Bc8 70.Ke7 Kb7 71.Kf8 Kxb6 72.Kg7[/font] White wins.
• If [font color="purple"]68...Bc8 69.b4 Ba6 70.b5 Bc8 71.Bb4!![/font] this is a clever way to avoid stalemate) then:
• If [font color="purple"]71...Bb7 72.Bxa5 Bc8 73.Bb4 Ba6 74.a5[/font] then:
• If [font color="purple"]74...Bb7[/font] then White wins after [font color="purple"]74...Bc8 75.Kd6.[/font]
• If [font color="burgundy"]74...Bb7[/font] then White wins after [font color="burgundy"]75.Kd6 Bc8 76.a6 Kb8 77.Bc5 Bxa6 78.bxa6 .[/font]
• If [font color="hotpink"]71...axb4[/font] then [font color="hotpink"]72.Kxc8 b3 73.b7+ Ka7 74.b8Q#.[/font]
• If [font color="#602020"]64...a4[/font] then after [font color=""#602020]65.Kc7 Bb7 66.b4 Ba6 67.Be7 Bb7 68.b5[/font] White wins with moves along the line at those executed in the [font color="purple"]notes at Black's 68th move.[/font]
• If [font color="purple"]63.a3 Be8 64.Kd6 Kb7 65.Ke7 c5 66.dxc5 d4 67.Kxe8[/font] then:
• If [font color="purple"]67...d3 68.Bd6 Kc6 69.b7 Kxb7 70.Ke7 Kc8[/font] then:
• If [font color="purple"]71.Kf6[/font] then:
• If [font color="purple"]71...d2 72.Kg7 d1Q 73.Kxh7 Qxb3 74.Kg7[/font] then:
• If [font color="purple"]74...Qb7+ 75.Kxg6 a4 76.h7 Qh1 77.Be5 Qc6+ 78.Bf6 Qxc5 79.h8Q+[/font] White wins.
• If [font color="#C08000"]74...Kd7 75.h7 Qxa3 76.Kxg6 Qc3 77.Be5 Qxc5 78.h8Q[/font] White wins.
• If [font color="hotpink"]71...Kb7 72.Kg7 d2 73.Kxh7 d1Q 74.Kg7[/font] then:
• If [font color="hotpink"]74...Qa1+ 75.Kxg6 Qh1 76.h7 Ka7 77.Be5 Qc6+ 78.Bf6[/font] the pawn will queen, giving White an extra piece.
• If [font color="burgundy"]74...Qd4+ 75.Kxg6 a4 76.h7 axb3 77.Be5 Qxc5 78.h8Q[/font] leaves White with an extra piece.
• If [font color="hotpink"]71.Kf8 d2 72.Kg7 d1Q 73.Kxh7[/font] then:
• If [font color="hotpink"]73...Qxb3[/font] then after [font color="hotpink"]74.Kg7 Qc3+ 75.Kxg6 Kd7 76.h7 Qh8 77.Be5[/font] the Queen must yield.
• If [font color="burgundy"]73...Qd4[/font] then after [font color="burgundy"]74.Kxg6 Kd7 75.h7 Qh8 76.Be5 Qe8+ 77.Kh6 Qe6+ 78.Bf6[/font] the pawn queens.
• If [font color="#C08000"]67...Kc6[/font] then after [font color="#C08000"]68.Bg7 d3 69.Bc3 d2 70.Bxd2 Kb7 71.Kf7[/font] White wins in the h-file.
• If [font color="purple"]60...Bd7 61.Bd6 Be6 62.Bc7 Ka8 63.Kb4[/font] then:
• If [font color="purple"]63...Bd7 64.Kc5 Kb7 65.Kd6 c5 66.Kxd7[/font] then:
• If [font color="purple"]66...cxd4[/font] then [font color="purple"]67.Be5 d3 68.Bc3 d4 69.Bd2 Kxb6 70.Ke7[/font] White wins on the h-file.
• If [font color="#C08000"]66...a5[/font] then White wins after [font color="#C08000"]67.dxc5 d4 68.c6+ Ka8 69.b7+ Ka7 70.b8Q+ Ka6 71.Qb7#.[/font]
• If [font color="hotpink"]63...Kb7[/font] then:
• If [font color="hotpink"]64.Kc5 Bd7 65.Kd6 Bc8 66.b4 Ka8 67.Kxc6.[/font]
• If [font color="purple"]57.Bc7 Be6 58.Kb4 Kc8 59.b3[/font] then:
• If [font color="purple"]59...Bg8 60.Nc5 a5+ 61.Ka4 Nxc5+ 62.dxc5 Kb7 63.Kxa5 Bf7 64.Kb4 Be8 65.Kc3[/font] then:
• If [font color="purple"]65...Bf7 66.a4 Bg8 67.Kd4[/font] then:
• If [font color="purple"]67...Be6 68.b4 Bf7 69.a5 Be6 70.Ke5[/font] then:
• If [font color="purple"]70...Bd7 71.b5 cxb5 72.Kxd5 b4 73.Kd6 b3 74.Kxd7[/font] then:
• If [font color="purple"]74...b2[/font] then [font color="purple"]75.c6+ Ka8 76.b7+ Ka7 77.b8Q+ Ka6 78.Qb6#.[/font]
• If [font color="#C08000"]74...Ka6[/font] then [font color="#C08000"]75.Kc6 Kxa5 76.b7+ Kb4 77.b8Q+ Ka3 78.Qa7+[/font] leads to mate.
• If [font color="#C00080"]70...Bg8[/font] then after [font color="#C00080"]71.b5 cxb5 72.a6+ Kxa6 73.c6 b4 74.b7[/font] the pawn will queen.
• If [font color="hotpink"]67...Ka8 68.b4 Bf7 69.a5[/font] then:
• If [font color="hotpnk"]69...Be6[/font] then after [font color="hotpink"]70.b5 cxb5 71.c6 Bc8 72.Kc5 Ba6 73.Be5[/font] White soon gives mate.
• If [font color="burgundy"]69...Kb7[/font] then White queens after [font color="burgundy"]70.b5 cxb5 71.a6+ Kxa6 72.c6 Ka5 73.b7+.[/font]
• If [font color="hotpink"]65...Be6 66.b4 d4 67.Bxd4 Bc4 68.b5[/font] then:
• If [font color="hotpink"]68...Bd5 69.Kb4 Bf3 70.Bf2 Bg2 71.a5 cxb5 72.Kxb5[/font] then:
• If [font color="hotpink"]72...Bf1+ 73.Kb4 Bg2 74.Kc3 Ka6 75.Kd4 Kxa5 76.Ke5[/font] White takes the h-pawn and wins.
• If [font color="#C08000"]72...Bc6+[/font] then after [font color="#C08000"]73.Kb4 Bd5 74.Kc3 Ka6 75.Kd4 Kxa5 76.Kxd5[/font] Black cannot stop the b-pawn.
• If [font color="darkpink"]68...Be2 69.Be3 Bf3 70.Kb4 Bd5 71.a5 cxb5 72.Kxb5 Bc6+ 73.Kb4[/font]
• If [font color="hotpink"]59...Kb7 60.Nc5+ Nxc5 61.Kxc5[/font] then:
• If [font color="hotpink"]61...Bc8 62.b4 Bd7 63.Kd6 c5 64.bxc5 Bc6 65.a3[/font] then:
• If [font color="hotpink"]65...a5 66.Bd8 a4 67.Bf6 Bb5 68.Kxd5 Bd7 69.Bd8[/font] then:
• If [font color="hotpink"]69...Bc6+[/font] then after [font color="hotpink"]70.Ke6 Ka6 71.d5 Bb7 72.c6 Ba8 73.b7[/font] White wins.
• If [font color="burgundy"]69...Be8 70.Ke6 Kc6[/font] then [font color="burgundy"]71.d5+ Kb7 72.c6+ Bxc6 73.dxc6+ Kxc6 74.Ke5[/font] wins; Black cannot stop the b-pawn and at the same time confine the White King to the h-file.
• If [font color="#C08000"]70...Bb5[/font] then White wins after [font color="#C08000"]71.d5 Be8 72.c6+ Bxc6 73.dxc6+ Kxc6 74.Ke5.[/font]
• If [font color="darkpink"]65...Ba4[/font] then White wins after [font color="darkpink"]66.Kxd5 Be8 67.Kd6 a5 68.d5 Ka8 69.c6.[/font]
• If [font color="burgundy"]61...a5 62.a4[/font] then [font color="burgundy"]63...Bd7[/font] then White wins after [font color="burgundy"]63.Kd6 Bc8 64.Bd8 Kb8 65.Ke7 Kb7 66.Kf8[/font] when the King captures Black's Black's h-pawn, clearing the path for his own pawn.
• If [font color="#C08000"]62...Ka8[/font] then White wins after [font color="#C08000"]63.Kxc6 Bc8 64.Kxd5 Bd7 65.Kd6 Bc8 66.d5.[/font]
• If [font color="purple"]52...Kb7 53.Nc5+ Nxc5 54.Kxc5[/font] then:
• If [font color="purple"]54...Be6 55.Kd6 Bf7 56.b4[/font] then:
• If [font color="purple"]56...Be8 57.Ke7 c5 58.bxc5 Bb5 59.Kd6 a5 60.Kxd5[/font] White wins.
• [font color="#C08000"]58...Ka8 59.Ke7 Bg8 60.Kf6 Kb7 61.Kg7 Be6 62.Kxh7[/font] gives White passed pawns on both sides of the board.
• If [font color="hotpink"]56...Bg8 57.a3 Bf7 58.Kd7[/font] then:
• If [font color="hotpink"]58...Bg8 59.Kd6 Bf7 60.a4 Be8 61.Kc5[/font] then:
• If [font color="hotpink"]61...Bd7 62.b5 cxb5 63.axb5 axb5 64.Kxd5 b4 65.Kc4[/font] White wins.
• If [font color="burgundy"]61...a5 62.bxa5 Bd7 63.Kd6[/font]then:
• [font color="burgundy"]63...Bc8 64.Ke7 c5 65.Kd8[/font]then:
• [font color="burgundy"]65...Be6 66.dxc5 d4 67.a6+ Kxa6 68.c6[/font]then:
• [font color="burgundy"]68...Ka5 69.b7+ Kb4 70.b8Q+[/font] White wins.
• [font color="#C08000"]68...d3 69.b7 d2 70.b8Q d1Q+ 71.Ke7[/font] White wins.
• [font color="#C00080"]65...cxd4 66.a6+ Kxa6 67.Kxc8 d3 68.b7 d2 69.b8Q d1Q 70.Qb6#.[/font]
• [font color="darkpink"]63...c5 64.Kxd7 cxd4 65.a6+ Kxa6 66.Kc6 d3 67.b7[/font] White gives mate in two moves.
• If [font color="hotpink"]54...a5 55.Kd6 a4 56.a3 Bf7 57.Ke7[/font] then:
• If [font color="hotpink"]57...Bg8[/font] then after [font color="hotpink"]58.Kf8 Be6 59.Kg7 c5 60.Be5 Kxb6 61.Kxh7[/font] White wins.
• If [font color="burgundy"]57...Ka6[/font] then White wins after [font color="burgundy"]58.Kxf7 c5 59.dxc5 Kb7 60.Be5 Kc6 61.Kg7.[/font]
• If [font color="darkpink"]47...Be8 48.Kd3 Kc8 49.Kc3 Bf7[/font] transposes into the notes to Black's 45th move; White wins (QED).

• If [font color="red"]47...Kd8 48.Kd3 Kc8 49.Kc3[/font] then:
• If [font color="red"]49...Bf7 50.Kb4 Bg8 51.Ka5[/font] then:
• If [font color="red"]51...Bf7[/font] then after [font color="red"]52.b4 Bg8 53.Nb2 Bf7
  54.a4 Be8 55.Nd3[/font] then:
• If [font color="red"]55...Bf7[/font] then [font color="red"]56.b5![/font] White wins (QED).
• If [font color="burgundy"]55...b5 56.cxb6[/font] White wins (QED).
• If [font color="darkpink"]51...b5[/font] then after [font color="darkpink"]52.cxb6 Kb7 53.Bc7[/font] White wins (QED).
• If [font color="darkred"]49...Kd8 50.Kb4 Kc8 51.Ka5[/font] then:
• If [font color="darkred"]51...Bf7[/font] then after [font color="darkred"]52.Nc3 Be8 53.a4 Kd8 54.b4 Kc8 55.b5![/font] White wins (QED).
• If [font color="magenta"]51...b5[/font] then after [font color="magenta"]52.cxb6 Kb7 53.Bc7[/font] White wins (QED).

• White wins by maneuvering on the queenside.

• Black's best bet to swindle White out of his win seems to be building a fortress, but White penitrates it with best play.
• If [font color="red"]49...Kd8 50.Kb4 Kc8 51.Nc3 Kd8[/font] then:
• If [font color="red"]52.Ka5 Kc8 53.Na4[/font] then:
• If [font color="red"]53...Bf7 54.b3 Bg8 55.Nb2[/font] then:
• If [font color="red"]55...Bf7 56.b4 Be8 57.Nd3[/font] then:
• If [font color="red"]57...Kd8[/font] then after [font color="red"]58.a4 Kc8 59.b5![/font] wins (QED).
• If [font color="darkred"]57...Bf7 58.a4 Be6 59.b5![/font] then:
• If [font color="darkred"]59...axb5[/font] then White wins after [font color="darkred"]60.axb5 cxb5 61.Kxb5 Bg8 62.Nb4 Bf7 63.c6.[/font]
• If [font color="magenta"]59...Nb8[/font] then White wins quickly after [font color="magenta"]60.Bxb8 Kxb8 61.bxa6 bxa6 62.Ne5.[/font]
• If [font color="darkred"]55...Kd8 56.Nd3 Bf7 57.a4 Be8 58.b4[/font] then:
• If [font color="darkred"]58...Kc8[/font] then White wins after [font color="darkred"]59.b5! cxb5 60.axb5 axb5 61.Nb4 Bf7 62.Kxb5.[/font]
• If [font color="magenta"]58...Bf7 59.Ne1[/font] then:
• If [font color="magenta"]59...Bg8 60.Nc2 Kc8 61.b5![/font] wins (QED).
• If [font color="darkorange"]59...Be8[/font] then White wins after [font color="darkorange"]60.Nc2 Kc8 61.b5![/font] wins (QED).
• If [font color="darkred"]53...Kd8 54.b4 Kc8 55.Nb2 Bf7[/font] then:
• If [font color="darkred"]56.a4 Be8 57.Nd3 Bf7 58.b5[/font] wins (QED).
• [font color="magenta"]56.Nd3 Bg8 57.a4 Be6 58.b5[/font] also wins (QED).
• If [font color="darkred"]52.Nd1 Kc8 53.Ka5[/font] then:
• If [font color="darkred"]53...Kd8 54.Ne3 Bf7 55.b4[/font] then:
• If [font color="darkred"]55...Be6 56.a4[/font] then:
• If [font color="darkred"]56...Bf7 57.b5![/font] wins (QED).
• If [font color="burgundy"]56...Kc8[/font] then [font color="burgundy"]57.b5![/font] wins (QED).
• If [font color="darkpink"]55...Kc8[/font] then [font color="darkpink"]56.Nc2 Be8 57.a4 Kd8 58.b5![/font] wins (QED).
• If [font color="magenta"]53...Bf7 54.a4![/font] then:
• If [font color="magenta"]54...b6+[/font] then White wins after [font color="magenta"]55.cxb6 Kb7 56.Bc5 Be8 57.Nf2.[/font]
• If [font color="darkorange"]54...Be8[/font] then [font color="darkorange"]55.b4 Kd8 56.b5![/font] wins (QED).

• The game has reached a position similar to the one diagrammed in the notes to White's 38th move. Even with his queenside pawns still at home, White has a powerful grip on the queenside and it is only a matter of time before he breaks through.

[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Arkadij Naiditsch[/center][center]Position after 51.Kb4a5[/center]

• There's nothing Black can do but wait to be pounded.
• If [font color="red"]51...Kd8[/font] then:
• If [font color="red"]52.b4 Kc8 53.Nb2 Bf7 54.a4[/font] then:
• If [font color="red"]54...Be8[/font] then [font color="red"]55.Nd3 Kd8 56.b5![/font] wins (QED).
• If [font color="burgundy"]54...Kd8[/font] then [font color="burgundy"]55.Nd3 Be8 56.b5![/font] wins (QED).
• If [font color="darkred"]52.Nc3[/font] then:
• If [font color="darkred"]52...Bf7 53.Nb1 Kc8 54.Na3[/font] then:
• If [font color="darkred"]54...Be8 55.Nc2 Bf7[/font] then:
• If [font color="darkred"]56.b4[/font] then [font color="darkred"]Be8 57.a4 Kd8 58.b5![/font] wins (QED).
• If [font color="burgundy"]56...b6+[/font] then White wins after [font color="burgundy"]57.cxb6 Kb7 58.Nd3 Nb8 59.Nc5+ Kc8 60.b7+.[/font]
• If [font color="darkpink"]54...Kd8[/font] then [font color="darkpink"]55.Nc2 Bg8 56.a4 Kc8 57.b4 Bf7 58.b5![/font] wins (QED).
• If [font color="magenta"]52...Kc8 53.Nd1 Bf7 54.Nf2[/font] then:
• If [font color="magenta"]54...b6+55.cxb6 Kb7 56.Nd3 Be6 57.b3 Bg8 58.Bc5 Be6 59.a3 Bf7 60.Ne5[/font] then:
• [font color="magenta"]60...Nxe5 61.dxe5 d4 62.Bxd4 c5 63.Be3 Bxb3 64.a4[/font] gives White two passed pawns and an easy win.
• If [font color="burgundy"]60...Nxc5 61.dxc5 Be8 62.a4 Kc8 63.Kxa6 Bd7 64.Ka7 [/font] leaves no way to stop the pawn from queening.
• If [font color="darkorange"]54...Bg8[/font] then:
• If [font color="darkorange"]55.Nd3 Be6 56.Nb4[/font] then:
• If [font color="darkorange"]56...Bg8 57.a4 Bf7 58.Nxc6 bxc6 59.Kxa6 Nb8+ 60.Bxb8[/font] is an easy win for White.
• [font color="burgundy"]56.Nb4 b6+ 57.cxb6 Kb7 58.Nxa6[/font] leaves White with an easy win, for example after 58...Nxb6 59.Nc5+ Ka6 60.Bb8+ Kxb8 61.Kxb6 White's queenside pawns are ready to roll are ready to roll and Black's Bishop is still imprisoned by his own pawn chain.
• [font color="#C08000"]55.a4 b6+ 56.cxb6 Kb7 57.Nd3[/font] transposes.

• If [font color="red"]52...Be6[/font] then:
• If [font color="red"]53.Nb2 Bf7 54.b4 Be8 55.a4 Bf7 56.b5![/font] wins (QED).
• If [font color="darkred"]53.a3 Kd8[/font] then:
• If [font color="darkred"]54.Nb2 Ke8 55.Nd3 Bg8 56.a4 Kd8 57.b4 Kc8 58.b5![/font] wins (QED).
• If [font color="magenta"]54.Nc3[/font] then:
• If [font color="magenta"]54...Ke8 55.a4[/font] then:
• If [font color="magenta"]55...Kd8 56.Na2[/font] then:
• If [font color="magenta"]56...Bf7 57.Nb4 Kc8 58.Nxc6!! bxc6 59.Kxa6 Nxc5+ 60.Bxc5[/font] White wins by advancing the queenside pawns.
• If [font color="darkorange"]56...Kc8[/font] then:
• If [font color="darkorange"]57.Nc3 Bg8 58.Na2 b6+ 59.Kxa6 bxc5 60.Bxc5[/font] then:
• If [font color="darkorange"]60...Nxc5+[/font] then after [font color="arkorange"]61.dxc5 d4 62.Nc1 Kb8 63.Kb6 Bd5 64.a5[/font] wins.
• [font color="#C08000"]60...Be6 61.b4 Kc7 62.Nc3 Nb8+ 63.Ka5 Kb7 64.b5[/font] yields White a strong passed pawn and better pieces.
• If [font color="purple"]57.Nb4[/font] then:
• [font color="purple"]57...Nb8 58.Bxb8 Kxb8 59.Kb6 Bd7 60.Na2 Be6 61.Nc3[/font] White advances the queenside pawns and wins.
• [font color="hotpink"]57...Kd8 58.Nxc6+ bxc6 59.Kxa6 Kc8 60.b4 Bf7 61.b5[/font] will yield two connected passers and victory to White.
• If [font color="darkorange"]55...Bg8 56.Na2 Be6 57.Nb4 Bf7 58.Nxc6[/font] then:
• If [font color="darkorange"]58...Be6[/font] then [font color="darkorange"]59.Kxa6 Kd8 60.Kb7[/font] then:
• If [font color="darkorange"]60...Be6 61.a5 Nxc5+ 62.dxc5[/font] then:
• If [font color="darkorange"]62...Bc8+[/font] then [font color="darkorange"]63.Kxc6 d4 64.Be5 Ke7 65.Bxd4 Ke6 66.b4[/font] is a clear triumph for the pawns.
• If [font color="purple"]62...Bd7[/font] then [font color="purple"]63.Bc7+ Ke8 64.a6[/font] wins quickly.
• If [font color="hotpink"]60...Nf8 61.a5[/font] then:
• If [font color="hotpink"]61...Be8 62.a6 Bd7 63.a7 Bc8+ 64.Kb6 Nd7+ 65.Kxc6[/font] leaves Black fighting against three connected passers.
• If [font color="burgundy"]61...Be6[/font] then [font color="burgundy"]62.Bc7+ Ke7 63.a6 Nd7 64.a7[/font] wins.
• If [font color="purple"]58...bxc6 59.Na7 Kd8 60.c6 bxc6 61.Nxc6+ Kc8 62.Kxa6[/font] gives White two connected passers.
• If [font color="darkorange"]54...Bf7 55.Na2 Kc8 56.a4 Be6[/font] then:
• If [font color="darkorange"]57.Nb4 Nb8 58.Kb6 a5 59.Nd3 Nd7+ 60.Kxa5[/font] then:
• If [font color="darkorange"]60...Bg8[/font] then [font color="darkorange"]61.b4 Bf7 62.b5 cxb5 63.axb5 Be6 64.c6[/font] wins easily.
• If [font color="purple"]60...b6+[/font] then [font color="purple"]61.cxb6 c5 62.Nxc5 Nxc5 63.dxc5[/font] wins easily.
• If [font color="hotpink"]57.b4[/font] then [font color="hotpink"]57...Bf7 58.Nc3 Be8 59.b5![/font] White wins (QED).

• If [font color="red"]53...b6+ 54.cxb6 Kb7 55.Bc5[/font] then:
• If [font color="red"]55...Bf7 56.Nd3 Be8 57.Kb4 Bf7 58.Ne5[/font] then:
• If [font color="red"]58...Be8 59.Nxd7 Bxd7 60.a4 Bc8 61.a5 Ka8 62.Bd6[/font] then:
• If [font color="red"]62...Kb7 63.Kc5 Bd7 64.b4 Be8 65.Be5[/font] then:
• If [font color="red"]65...Bd7 66.Kd6 Be8 67.Ke7 c5 68.bxc5 Ba4 69.Ke6[/font] then:
• If [font color="red"]69...Bd1[/font] then after [font color="red"]70.Kxd5 Ba4 71.Kd6 Bb3 72.c6+ Ka8 73.Kc7[/font] White gives mate in two moves.
• [font color="burgundy"]69...Bb3 70.Kd6 Ba2 71.c6+ Ka8 72.Kc7 Bc4 73.b7+[/font] White gives mate on the next move.
• If [font color="darkred"]62...c5+ 63.Kxc5 Bd7 64.Kxd5[/font] then:
• If [font color="darkred"]64...Kb7 65.Be5 Kc8 66.Kd6[/font] then:
• If [font color="darkred"]66...Be8[/font] then after [font color="darkred"]67.Ke7 Bd7 68.b7+ Kxb7 69.Kxd7 Ka8 70.Ke7[/font] White wins either by advancing the d-pawn or by taking Black's a-pawn and queening his own.
• If [font color="darkorange"]66...Kd8[/font] then White wins immediately after [font color="darkorange"]67.b7.[/font]
• If [font color="magenta"]64...Bc6+[/font] then White wins after [font color="magenta"]65.Ke6 Bf3 66.d5 Kb7 67.Be5 Kc8 68.d6.[/font]
• If [font color="darkred"]58...Nxe5 59.dxe5[/font] then:
• If [font color="darkred"]59...Be6 60.Be3 Bc8 61.Kc5[/font] then:
• If [font color="darkred"]61...d4 62.Bxd4 Be6 63.Kd6 c5 64.Bxc5[/font] then:
• If [font color="darkred"]64...Bf7[/font] then after [font color="darkred"]65.Ke7 Bg8 66.e6 Kc6 67.Bf2 Kb7 68.Kd7[/font] White wins.
• If [font color="#C08000"]65...Kc8[/font] then [font color="#C08000"]66.Kd6 Bf7 67.Ke7 Bg8 68.Kf8 Be6 69.Kg7[/font] soon gives White passed pawns on either side of the board.
• If [font color="purple"]64...a5[/font] then [font color="purple"]65.Kxe6 Kc6 66.Kf7 a4 67.b4 Kd5 68.b7[/font] the pawn queens.
• If [font color="darkorange"]61...Bd7[/font] then [font color="darkorange"]62.Kd6 Be8 63.Ke7[/font] wins the Bishop.
• If [font color="magenta"]59...Kb8[/font] then White wins after [font color="magenta"]60.Bd4 Kc8 61.Kc5 Kd7 62.Bc3 d4 63.Kxd4.[/font]
• If [font color="darkred"]55...Nb8 56.Nd3[/font] then:
• If [font color="darkred"]56...Nd7 57.Ne5 Nxe5 58.dxe5[/font] then:
• If [font color="darkred"]58...d4 59.Bxd4 c5 60.Bxc5 Bf7 61.Ba3[/font] then:
• If [font color="darkred"]61...Be6 62.b4 Bc4 63.Bc1[/font] then:
• If [font color="darkred"]63...Bb5[/font] then after [font color="darkred"]64.Be3 Kc8 65.a4 Bc4 66.e6 Bxe6 67.Kxa6[/font] White wins.
• If [font color="burgundy"]63...Kb8[/font] then White wins after [font color="burgundy"]64.a4 Kb7 65.Be3 Be6 66.b5 axb5 67.Kxb5[/font] gives White three passed pawns; at least one of them will queen.
• [font color="#C08000"]61...Bd5 62.Bc1 Bc6 63.a4 Bd5 64.b4 Bc6 65.Be3[/font] wins.
• If [font color="darkpink"]58...Bf7[/font] then after [font color="darkpink"]59.Kb4 Kc8 60.Bd4 c5+ 61.Kxc5 Kb8 62.Bf2[/font] White wins by keeping the d-pawn under restraint and advancing his queenside; Black's best try lays in sacrificing his passed pawn, but that won't give him any practical chances.
• If [font color="magenta"]56...Bf7 57.Bd6 Nd7 58.Bc5[/font] then:
• If [font color="magenta"]58...Bg8 59.Kb4 Bf7 60.Ne5 Be8 61.a4[/font] then:
• [font color="magenta"]61...a5+ 62.Kxa5 Nb8 63.b4 Nd7 64.Nxc6 Kxc6 65.Ka6[/font] forces Black to part with his Knight or submit to a quick mate.
• If [font color="darkorange"]61...Nxe5 62.dxe5[/font] then:
• [font color="darkorange"]62...Bd7 63.Bd4 Kb8 64.Kc5 Ka8 65.Kd6 Bc8 66.Kc7[/font] gives White two passed pawns.
• [font color="purple"]62...Bf7 63.Bd4 Kc8 64.Kc5 Kb7 65.a5 Be8 66.e6[/font] gives White two passed pawns.
• If [font color="darkorchid"]58...Be8 59.Ne5 Nxe5 60.dxe5[/font] transposes back to the [font color="red"]main line of this note.[/font]

• [font color="red"]56.b4 Be8 57.b5[/font] wins.

• This is no worse than anything else.
• If [font color="red"]56...Nb8 57.Bxb8 Kxb8[/font] then:
• If [font color="red"]58.Kb6! Kc8 59.Na2[/font] then:
• If [font color="red"]59...Be8 60.b4 Bd7 61.Nc1[/font] then:
• [font color="red"]61...Be6 62.Nb3 Kb8 63.Na5 Bc8 64.Nxc6+ bxc6 65.Kxc6[/font] leaves Black's pawns falling like rain.
• If [font color="burgundy"]61...a5[/font] then White wins after [font color="burgundy"]62.bxa5 Be6 63.Nd3 Kb8 64.Nb4 Bd7 65.a6.[/font]
• If [font color="darkpink"]59...Kb8[/font] then White wins after [font color="darkpink"]60.b4 Be8 61.Nc1 Bf7 62.Nb3 Be6 63.Na5 Bd7 64.Nxb7.[/font]
• If [font color="darkred"]58.Nxa6+?? bxa6 59.Kxa6 Kc7![/font] then:
• If [font color="darkred"]60.b4 Be6[/font] then:
• [font color="darkred"]61.b5 cxb5 62.axb5 Bc8+ 63.Ka5 Bd7 64.c6 Bc8[/font] followed by [font color="darkred"]65...Kb6[/font] draws.
• [font color="darkorange"]61.Ka7 Bd7 62.Ka8 Kc8 63.Ka7[/font] draws.
• If [font color="magenta"]60.Ka7 Be6 61.b4 Bd7 62.Ka8 Kc8 63.Ka7 Kc7[/font] draws.

[center]BLACK: Arkadij Naiditsch[/center]

[center][/center]

[center]WHITE: Richard Rapport[/center][center]Position after 56..Bf7e8[/center]

• In compesation for his piece, White gets two pawns and all the freedom available in the position.

• Zugzwang! Black must begin losing material and wait helpessly as White's queenside pawns advance.
• Rapport Ur resigns.

Richard Rapport started well, hit some speed bumps and lost the lead to Herr Naiditsch in the late rounds, but bounced back to tie Naiditsch for first place in Group B.

[center][/center]

[center]Richard Rapport[/center][font size="1"]Photo by Gerhard Hund (http://commons.wikimedia.org/wiki/User:GFHund) from Wikimedia Commons (http://en.wikipedia.org/wiki/File:Rapport,Richard_2012_Deizisau.jpg)
(Creative Commons License, Attribution/Share Alike)
[/font]

Sipke Ernst - Richard Rapport
75th Tata Steel International Tournament (Group B), Round 3
Wijk aan Zee, 14 January 2013

West India Game: Tal-Indian Defense (Modern Benoni)

1.d4 Nf6 2.c4 c5 3.d5 g6 4.Nc3 Bg7 5.e4 0-0 6.Nf3 e6 7.Bd3 exd5 8.cxd5 d6 9.h3

• For the continuations 9...b5, [font color="red"9...Re8[/font] and [font color="blue"9...a6,[/font] see Meier-Gashimov, Euro ChT, Novi Sad, 2009.
/ul]
9...Bd7 10.Bf4 Re8 11.0-0


• If [font color="red"]11.Nd2 b5[/font] then:
• If [font color="red"]12.0-0 c4 13.Bc2 b4 14.Ne2[/font] then:
• If [font color="red"]14...c3 15.bxc3 bxc3 16.Nc4 Nxe4[/font] then:
• [font color="red"]17.Ng3 Qh4 18.Nxe4 Qxf4 19.g3 Qh6 20.h4[/font] gives White the advantage as Black's d-pawn must fall (Bronstein-D. Gurevich, Op, Las Vegas, 1993).
• [font color="darkorange"]17.f3 Bb5 18.fxe4 Bxc4 19.Rf3 Bxe2 20.Qxe2 Nd7[/font] leaves Black an extra pawn (Cherednichenko-Pertlova, Euro ChW, Dresden, 2007).
• [font color="magenta"]14...Bb5 15.Ba4 a6 16.Nxc4 Nxe4 17.Re1 g5 18.Be3[/font] is equal.
• [font color="darkred"]12.Bxd6 b4 13.Ne2 Bxh3 14.Rxh3 Qxd6 15.f4[/font] is equal (Navara-Volokitin, Greek ChT, Ermioni Argolidas, 2005).

11...b5 12.a3 (N)


• If [font color="red"]12.Bxd6 b4[/font] then:
• If [font color="red"]13.Ne2 Nxe4 14.Bxe4 Rxe4[/font] then:
• [font color="red"]15.Ng3 Re8 16.Bxc5 Bb5 17.Re1 Na6 18.Rxe8+[/font] gives White the advantage in space (Lahner-Sikora Lerch, Op, Karvina, Czechia, 2001).
• [font color="magenta"]15.Bxc5 Bb5 16.Re1 Na6 17.Be3 Bxb2 18.Qc2[/font] is equal (Rogozenko-Shulman, Op, Calcutta, 1999).
• [font color="darkred"]13.e5 bxc3 14.exf6 Qxf6 15.Bxc5 cxb2 16.Rb1 Qc3[/font] gives Black an excellent game with a pawn sitting on b2 protected from a distance by the nested Bishop (Szymanski-Breivik, Anibal Op, Linares, 2005).

12...b4


• The game is equal.
/ul]
13.axb4 cxb4 14.Nb5 Nxe4


• If [font color="red"]14...Bxb5 15.Bxb5 Rxe4 16.Be3[/font] then:
• [font color="red"]16...a6 17.Qb3 a5 18.Rfc1 Re7 19.Rc2 h6 20.Qc4[/font] remains equal.
• [font color="darkred"]16...Re7 17.Nd4 a5 18.Bc6 Ra6 19.Bb5 Ra8[/font] remains equal.

15.Nxd6!?


• White grabs a pawn, restoring material balance. He's a little bettr developed than Black, but Black has the best piece on the board in the Knight at e4 and there might be bettefr was to deal with it.
• [font color="red"]15.Qc2 b3 16.Qxb3 Bxb5 17.Bxb5 Nd7 18.Rfe1 Re7[/font] remains equal.


[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Sipke Ernst[/center][center]Position after 15.Nb5d6:p[/center]

15...Nxd6!


• Black has a small advantage in space.
/ul]
16.Bxd6 Qb6 17.Bg3?!


• The Bishop has more potential at f4.
• If [font color="red"]17.Bf4 Bxb2 18.Rb1 Bf6 19.Nd2[/font] then:
• [font color="red"]19...a5 20.Nc4 Qd8[/font] gives Black an extra pawn and White a slight advantage in space.
• [font color="darkred"]19...Bd4 20.Nc4 Qf6 21.Qf3 a5 22.Qg3 Na6[/font] continues to give Black a small advantage.

17...Bxb2!


• Black has an extra pawn.
/ul]
18.Qd2?!


• White apparently thinks he's worse off than he is. Although a pawn down, he has some extra space and Black's undeveloped queenside is cramped.
• If [font color="red"]18.Ra2 Bg7 19.Bc4 Bb5[/font] then:
• [font color="red"]20.Bc7 Qxc7 21.Bxb5 Rd8 22.Re1 a6 23.Ba4 Qd6[/font] continues to gives Black an extra pawn, but White has the advantage in space.
• If [font color="darkred"]20.Qc2?[/font] then Black wins after [font color="darkred"]20...Rc8! 21.Bxb5 Rxc2 22.Rxc2 Na6 23.Bc6 b3.[/font]

18...Bc3!?


• Black should take the Rook.
• If [font color="red"]18...Bxa1! 19.Rxa1 Qc5[/font] then:
• If [font color="red"]20.Bf1 a5 21.Rc1[/font] then:
• [font color="red"]21...Qf8 22.Rc7 a4 23.Bc4 a3 24.Kh2 Re4[/font] continues to give White and extra pawn and two connected remote passers, but they are stalled for now.


• If [font color="darkred"]21...Qb6? 22.d6[/font] then:
• [font color="darkred"]22...Bb5 23.Qh6 Nd7 24.Rc7 f6 25.Bc4+ Bxc4 26.Rxd7[/font] is equal.


• [font color="magenta"]22...a4 23.Ne5 Re6 24.Nc4 Qb7 25.Ne5 b3[/font] is equal


• If [font color="darkred"]20.Rc1 Qxd5 21.Qh6[/font] then:
• [font color="darkred"]21...Qh5! 22.Qxh5 gxh5 23.Rc5 h6 24.Rxh5 a5[/font] gives White two connected passers advancing on the queenside for extra pawns.


• [font color="magenta"]21...Bc6[/font (this is a slower to a win for Black; White cannot threaten mate with 22.Ng5?? because of 22...Qxg2#!) [font color="magenta"]22.Bc4 Qh5 23.Qf4 Qf5 24.Qxf5 gxf5[/font] gives Black two extra pawns that are remote connected passers.

19.Qh6


• [font color="red"]19.Qf4 a5 20.Rac1 a4 21.d6 Be6 22.Ng5 Nd7[/font] leaves Black with advancing connected passers on the queenside; Black's kingside is well defended.

19...Bg7


• Black is not concerned about the Rook at a1 as long as he has a Bishop on the long diagonal. The White Queen at h6 needs more attention at the moment.

20.Qh4


• If [font color="red"]20.Qf4 Bxa1 21.Rxa1 Kg7 22.Qh4 Qf6[/font] then:
• [font color="red"]23.Qxf6+ Kxf6 24.Bd6 b3 25.Ba3 Kg7 26.Nd2 a5[/font] gives White a good position with some chances, but he should find a way to develop his Knight and Rook.
• If [font color="darkred"]23.Rc1?[/font] then Black wins after [font color="darkred"]23...Qxh4! 24.Bxh4 a5 25.Rb1 Na6 26.Bg5 Nc5.[/font]

20...a5 21.d6?


• While the pawn is easier to dedend at d6, it is more useful at d5 where it prevented Black's Knight from developing.
• If [font color="red"]21.Rac1!?[/font] then:
• [font color="red"]21...Bb5 22.Ng5 h6 23.Bxb5 Qxb5 24.Ne4 Qxd5[/font] gives Black the stronger game; the Black Knight is free to develop and the White Knight has no outposts.
• [font color="darkred"]21...b3 22.Rfe1 Rxe1+ 23.Rxe1 Qf6 24.Qe4 Qc3[/font] leaves Black with dangerous passers, but White still has strength in the center.
• If [font color="blue"]21.Rae1 Qf6 22.Qc4 Qc3 23.Qh4[/font] then:
• If [font color="blue"]23...Qf6 24.Qc4 Qc3[/font] then:
• [font color="blue"]25.Rxe8+ Bxe8 26.Re1 Nd7 27.Qc6 Qxc6 28.dxc6 Nc5[/font] gives Black a strong advantage, but White still has potential counterplay.
• [font color="dodgerblue"]25.Qh4 Bf6 26.Qf4 b3 27.Rc1 Qxd3 28.Qxf6 Ra6[/font] gives Black a strong advantage, but White can still make mischief on the kingside.
• [font color="darkblue"]23...Qxd3? 24.Rxe8+! Bxe8 25.Qd8 Bf8 26.Ne5 Qd2 27.Qxe8[/font] is equal.


[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Sipke Ernst[/center][center]Position after 21.d5d6[/center]

21...Qd8!


• Black's pieces are covered and White's Queen is attack.

22.Qc4


• If [font color="red"]22.Qxd8[/font] then Black wins after [font color="red"]22...Rxd8 23.Rab1 Nc6 24.Bh4 Rdb8 25.Bc4 a4.[/font]

22...Be6


• Black has a quicker win after [font color="red"]22...Bxa1 23.Rxa1 Qf6 24.Rd1 Bc6 25.Nd4 Ba4.[/font]

23.Qb5 Nd7


• If [font color="red"]23...Bxa1 24.Rxa1[/font] then:
• Black wins after [font color="red"]24...Nd7 25.Ng5 Rb8 26.Nxe6 Rxe6 27.Qc6 b3.[/font]
• Black also wins after [font color="darkred"]24...Bd7 25.Qc4 Qf6 26.Rd1 Nc6 27.Nd2 Ne5.[/font]

24.Rac1 Rb8 25.Qa4 Bc3 26.Bh4


• If [font color="red"]26.Qd1 Nc5 27.Bc2[/font] then Black wins after [font color="red"]27...Bc4 28.d7 Nxd7 29.Bxb8 Bxf1 30.Kxf1 Nxb8.[/font]
• If [font color="darkred"]27.Bf4 a4 28.Bb1 Bc4 29.Re1 Rxe1+ 30.Nxe1 a3[/font] White must lose a piece to stop a pawn.

26...f6 27.Rxc3


• The exchange sacrifice is more stubborn than [font color="red"]27.Qc2 Kg7 28.Bg3 Nc5 29.Nh4 Nxd3 30.Qxd3 Bd7.[/font]


[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Sipke Ernst[/center][center]Position after 27.Rc1c3:B[/center]

27...bxc3


• White has succeeded is separating Black connected passers, but it's too late to matter.

28.Qc2 Bf7 29.Qxc3 Rb3 30.Qd2


• If [font color="red"]30.Qc2 Qb6 31.Rd1 a4 32.Bc4[/font] then:
• [font color="red"]32...Rb4 33.Bxf7+ Kxf7 34.Qc3 Kg7 35.Kh2 Rbe4[/font] leaves Black with the exchange for a pawn.
• [font color="darkred"]32...Rb2? 33.Qxa4! Bxc4 34.Qxd7 Bf7 35.Qc7[/font] is equal.

30...Qb6 31.Bc2 Rb2 32.Qc3 Rb4 33.Qa1


• [font color="red"]33.Bg3 a4 34.Qc7 Qxc7 35.dxc7 a3 36.Bd6 Rb2[/font] leaves White's Bishop with no move that doesn't lose, e.g., 37.Bd3 a2!/li]

33...Re2 34.Rc1


• If [font color="red"]34.Bxf6 Rxc2 35.Bh8 Rcb2 36.Bxb2 Rxb2[/font] leaves Black with a Bishop for two pawns.


[center]BLACK: Richard Rapport[/center]

[center][/center]

[center]WHITE: Sipke Ernst[/center][center]Position after 34.Rf1c1[/center]

34...Rxh4!!


• The exchange sacrifice is the shortest way home.
/ul]
35.Nxh4 Qxf2+ 36.Kh1 Rxc2 0-1


• [font color="red"]37.Rxc2 Qxc2 38.Nf3 a4 39.Kh2 Qc4 40.Qa3 Kg7[/font] leaves Black with an extra pawn and an extra minor piece.
• Mh. Ernst resigns.

[center][/center]

[center]Levon Aronian[/center][font size="1"]Photo by Frank Hoppe in Wikimedia Commons (http://commons.wikimedia.org/wiki/Category:Levon_Aronian)
(Public Doamin)
[/font]

Levon Aronian - Wang Hao
75th Tata Steel International Tournament (Group A), Round 10
Wijk aan Zee, 23 January 2013

King's English Game: Catalan Opening

1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 Nd4

• For more common lines of the King's English, see Zhao Xue-Yildiz, Grand Prix W, Nanjing, 2009.

• If [font color="red"]6...Bb4 7.Qb3 Bc5 8.d3[/font] then:
• If [font color="red"]8...c6 9.0-0 0-0[/font] then:
• If [font color="red"]10.Bg2 h6[/font] then:
• If [font color="red"]11.Bd2 Re8 12.Rac1[/font] then:
• If [font color="red"]12...a6 13.Na4 Ba7 14.c5 d5 15.cxd6 Qxd6 16.Bb4 Qc7[/font] then:
• [font color="red"]17.Nc5 Be6 18.Nxe6 Rxe6 19.e3 Rd8 20.Rfd1 Bb6[/font] is equal (Timofeev-Kobalia, Aeroflot Op, Moscow, 2010).
• [font color="burgundy"]17.Qc2 Be6 18.Bc5 Bxc5 19.Nxc5 Rad8 20.Nxe6 Rxe6[/font] is equal (V. Popov-Delchev, Euro Ch, Rijeka, 2010).
• [font color="#C08000"]12...Bf8 13.h3 d6 14.Kh2 a6 15.Be3 Qe7 16.Rcd1[/font] is equal (Aronian-Svidler, Grand Prix, Sochi, 2008).
• If [font color="darkred"]11.e3[/font] then:
• [font color="darkred"]11...Bb6 12.Na4 Bc7 13.e4 a6 14.c5 d6[/font] is equal (Lautier-Sebag, French ChT, Montpellier, 2007).
• [font color="magenta"]11...Re8 12.h3 Bf8 13.Bd2 d6 14.d4 Qc7 15.d5[/font] is equal (Uhlmann-Pohla, IT, Tallinn, 1977).
• If [font color="darkred"]10.Bg5 Be7[/font] then:
• [font color="darkred"]11.Rfd1 d6 12.Rac1 h6 13.Bd2 Qc7 14.Bg2 Bf5[/font] is equal (Tomashevsky-Svidler, Russian Ch, Moscow, 2005).
• [font color="magenta"]11.Rac1 h6 12.Bxf6 Bxf6 13.c5 Be7 14.Ne4 d5[/font] is equal (Gelfend-Svidler, Tal Mem Blitz, Moscow, 2009).
• If [font color="darkred"]8...h6 9.0-0 0-0[/font] then:
• If [font color="darkred"]10.Bd2 Re8 11.Rac1[/font] then:
• [font color="darkred"]11...Rb8 12.Qa4 d6 13.b4 Bd4 14.e3 Bxc3 15.Bxc3 Bh3[/font] gives Black more freedom and a slight initiative while White has more space (Aronian-Istratescu, Euro ChT, Novi Sad, 2009).
• [font color="darkorange"]11...c6 12.Rfd1 Bf8 13.Qa4 d5 14.cxd5 cxd5 15.Qb3[/font] is equal (Bareev-Van Wely, Amber Blind, Monte Carlo, 2002).
• [font color="magenta"]10.Na4 Be7 11.Be3 d6 12.Nc3 c6 13.Rad1 Qc7[/font] is equal (Aronian-Eljanov, IT A, Wijk aan Zee, 2008).

• [font color="red"]9.Rb1 a5 10.a3 c6 11.b4 Bd4 12.Qb3 axb4 13.axb4 d5[/font] is equal (Yakovich-Kurnosov, Russian Ch Qual, St Petersburg, 2004).

• The game is equal.

• [font color="red"]10.Na4 Bb6 11.Nxb6 Qxb6 12.a4 Qc7[/font] remains equal.

• After [font color="red"]10...d6 11.Na4 Bd4 12.e3 Bb6 13.Qc2 Bf5[/font] Black's attack on the weak d-pawn gives him a slight advantage.

• [font color="red"]11...d6 12.Qb3 Be6 13.Qxb7 Rb8 14.Qxc6 Bd7 15.Qa6[/font] remains equal.

• This move may be deliberately provocative. White weakens his grip on d4.
• If [font color="red"]12.Qa4 d6 13.b4[/font] then:
• [font color="red"]13...d5 14.b5 d4 15.Ne4 Nxe4 16.Bxe4 c5 17.e3[/font] remains equal.
• [font color="darkred"]13...a6 14.Qa5 Be6 15.Rc2 d5 16.Qxd8 Raxd8[/font] remains equal.

[center]BLACK: Wang Hao[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 12.e2e4[/center]

• Black's isn't biting.
• [font color="red"]12...Bc5! 13.Bh3 d6 14.Bxc8 Qxc8 15.Kg2 Bd4[/font] gives Black the occupation of d4 and possibilities of a queenside advance.

• White is intent on provoking a fight.
• [font color="red"]13.Be3 Bg4 14.Qc2 Be7 15.d4 exd4 16.Bxd4[/font] remains equal.

• Black has a slight advantage and seems intent on a queenside advance.

• White restrains the advance. The game is equal.

• If [font color="red"]15.Qe2 Be6 16.Be3 c5 17.h4 Be7 18.Bd2 Qc7[/font] remains equal.

• The game remains equal.
• [font color="red"]15...Bd7! 16.f4 Be7 17.b4 Qb6 18.a5 Qc7 19.Na4[/font] givesBlack an extra pawn and White a small advantage in space.
• [font color="blue"]15...Be7!? 16.b4 Qd7 17.Rb1 Bd8 18.Qc2 Bb6 19.a5[/font] is equal.

• The game is equal.
• [font color="red"]16.f4! Nc5 17.Qc2 exf4 18.Bxf4 Bd7 19.d4[/font] is equal.

• White undermines Black's center by attacking the headpawn.
• If [font color="red"]17.d4[/font] then:
• If [font color="red"]17...Be7 18.d5 Nf8 19.b3[/font] then:
• [font color="red"]19...Qc7 20.h4 Bd7 21.Nb1 Qd8 22.Re1 Nh7 23.Qd3 Nf6[/font] remains equal.
• [font color="magenta"]19...Qd7 20.Rc2 Qc7 21.h4 Bd7 22.Rd2 Qc8 23.c5[/font] remains equal.
• [font color="darkred"]17...exd4 18.Bxd4 Ne5 19.b3 Qc7 20.f4 Nd7 21.Qc2[/font] remains equal.

• [font color="red"]19.Rcf2 Be7 20.f5 Bc8 21.d4 Nd7 22.d5 c5[/font] remains equal.

[center]BLACK: Wang Hao[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 19.f4f5[/center]

• Suddenly, Black is skating on thin ice. White had too many defenders on b5 for Black to justify this move.
• If [font color="red"]20...Bc8 21.Bh5[/font] then:
• [font color="red"]21...Nd7 22.Qf3 Nf6 23.d4 b6 24.d5 c5 25.Qe2[/font] is equal.
• If [font color="darkred"]21...b6!? 22.f6 gxf6 23.Rcf2 Bg7[/font] then:
24.Bxh6!! Bxh6 25.Rxf6 Bf4[/font] then:
• [font color="darkred"]26.Bxf7+! Kf8 27.R6xf4 exf4 28.Bxe8 Qxe8 29.Rxf4+ Kg7 30.d4[/font] gives White three pawns and an attack on a denuded King for a Bishop.
• [font color="darkorange"]26.R1xf4 exf4 27.Bxf7+ Kf8 28.Rxf4 Re5 29.d4 Rg5 30.Bd5+[/font] gives White three pawns and an attack on a denuded King for a Rook.
• [font color="magenta"]24.Qc2!? Be6! 25.b3 d5 26.exd5 cxd5 27.cxd5 Bxd5[/font] gives Black an extra pawn.

• White gets his ice pick.
• If [font color="red"]21.cxb5!? cxb5 22.Bh5[/font] then:
• If [font color="red"]22...b4[/font] then:
• [font color="red"]23.f6 bxc3 24.fxg7 Bxg7 25.Bxf7+ Kh7 26.bxc3 Re6 27.Qh5[/font] gives White two extra pawns.
• If [font color="darkred"]23.Nd5!?[/font] then:
• If [font color="darkred"]23...Rb7 24.Qg4 Bxa4 25.Bxh6[/font] then:
• If [font color="darkred"]25...f6 26.Be3 g6 27.Bxg6[/font] then:
• [font color="darkred"]27...Bg7 28.Qh5 Bh8 29.Bxc5 Bxc2 30.Bb6 Qc8 31.Bxe8[/font] gives White a prohibitive material advantage.
• [font color="burgundy"]27...Rg7 28.Rxc5 dxc5 29.Qh5 Bb3 30.Bxe8 Bxd5 31.exd5[/font] gives White an extra Bishop.
• If [font color="magenta"]25...Bxc2 26.Bg5[/font] then:
• [font color="magenta"]26...f6 27.Bg6 Ne6 28.fxe6 Qb6 29.Qh5[/font]
• [font color="darkorange"]26...Bd1 27.Rxd1 Be7 28.Bxe7 Rexe7 29.f6 Ne6 30.fxe7[/font] gives White an extra piece.
• If [font color="magenta"]23...Bxa4? 24.Bxf7+!![/font] then:
• [font color="magenta"]24...Kxf7 25.Qh5+! Kg8 26.Bxh6 Bxc2 27.Bxg7 Bxg7 28.f6[/font] is equal.
• If [font color="darkorange"]24...Kh8 25.f6 Rb7 26.fxg7+[/font] then:
• If [font color="darkorange"]26...Bxg7[/font] then White wins after [font color="darkorange"]27.Qh5 Rf8 28.Bxh6 Rfxf7 29.Rxf7 Rxf7 30.Bg5+.[/font]
• If [font color="purple"]26...Kxg7 27.Bxh6+[/font] then:
• If [font color="purple"]27...Kh8[/font] then [font color="purple"]28.Qh5 Qh4 29.Bg7+ Kxg7 30.Qg6+ Kh8 31.Qg8#.[/font]
• If [font color="hotpink"]27...Kxh6[/font] then [font color="hotpink"]28.Qh5+ Kg7 29.Qg6+ Kh8 30.Qg8#.[/font]
• If [font color="darkred"]22...bxa4[/font] then:
• If [font color="darkred"]23.f6 Be6 24.fxg7 Bxg7 25.Rcf2[/font] then:
• [font color="darkred"]25...Re7 26.Bg4 Rb4 27.Bxe6 fxe6 28.Qc2 Rbb7 29.Bxc5 dxc5 30.Nxa4[/font] is equal.
• [font color="burgundy"]25...Rf8 26.Bg4 Qc7 27.Bf5 Qd7 28.d4 exd4 29.Bxd4[/font] is equal.
• If [font color="magenta"]23.Nd5[/font] then:
• If [font color="magenta"]23...a3 24.Bxf7+ Kxf7 25.Qh5+ Kg8 26.Bxh6!! Bc6 27.Bxg7[/font] then:
• [font color="magenta"]27...Bxd5 28.f6 Bxg7 29.exd5 Qxf6 30.Rxf6 Bxf6 31.Qg6+[/font] is equal.
• If [font color="purple"]27...Nxd3??[/font] then White wins after [font color="purple"]28.Qh8+! Kf7 29.Qh7 Qg5 30.Bh6+.[/font]
• [font color="darkorange"]23...Bc6 24.f6 Rb7 25.Qg4 Bxd5 26.exd5 g5 27.Bxg5[/font] gives Black a vicious attack excellect prospects of success.

• Is it getting warmer out there on that frozen lake?
• If [font color="red"]21...Be7 22.d4[/font]
• If [font color="red"]22...Nb3 23.dxe5 dxe5 24.Rcf2[/font] then:
• [font color="red"]24...Nd4 25.Bxd4 exd4 26.Qxd4 cxb5 27.e5 Bxf5 28.Bd5[/font] gives White a small advantage in space and freedom; Black has the Bishop pair, but must use them in a defensive posture.
• [font color="burgundy"]24...Bc5?! 25.Bxc5! Nxc5 26.Rd2 Qc8 27.Qc2 Qc7 28.Be2[/font] leaves White with an extra pawn and Black running out of couterplay.
• If [font color="darkred"]22...exd4? 23.Bxd4![/font] then:
• If [font color="darkred"]23...cxb5 24.Bxc5 b4 25.f6[/font] then:
• If [font color="darkred"]25...gxf6 26.Ba7[/font] then:
If
• [font color="darkred"]26...Rb7[/font] then after [font color="darkred"]27.Nd5 Rxa7 28.Qd4 Rb7 29.Bh5 Bc8 30.Rcf2[/font] Black is busted.
• If [font color="burgundy"]26...bxc3[/font] then White wins after [font color="burgundy"]27.Bxb8 Qxb8 28.Qc1 cxb2 29.Rxb2 Qc7 30.Qxh6[/font]
• If [font color="darkorange"]25...Bxf6[/font] proves disastrous after [font color="darkorange"]26.Bxd6![/font] when:
• If [font color="darkorange"]26...Rc8[/font] then White wins after [font color="darkorange"]27.Nd5 Ba4 28.Nxf6+ Qxf6 29.e5 Qg6 30.Rff2.[/font]
• If [font color="purple"]26...bxc3[/font] then White wins after [font color="purple"]27.Bxb8 Ba4 28.Qxd8 Rxd8 29.Re2 Rc8 30.bxc3.[/font]
• If [font color="magenta"]23...Nb3[/font] then White wins after [font color="magenta"]24.Ba7 Ra8 25.Be3 Bf6 26.Bh5 Qe7 27.Bf4.[/font]

[center]BLACK: Wang Hao[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 21...cb5:p[/center]

• While Black is busy with his ill-advised queenside advance, White is about to show Black that his kingside structure is invested with termites.

• The d-file is open for White's heavy pieces.
• If [font color="red"]22...b4 23.f6![/font] then:
• If [font color="red"]23...gxf6 24.Bxf7+!![/font] then:
• [font color="red"]24...Kxf7 25.Qh5+ Kg8 26.Qg6+ Bg7 27.Bxh6 Re7 28.Nd5[/font] leaves White pounding Black's King position; the end is near.
• [font color="magenta"]24...Kh8 25.Nd5 Be6 26.Bxe8 Qxe8 27.Nxf6 Qf7 28.Rcf2[/font] leaves White pulling in the matinging net with the exchange and an extra pawn.
• If [font color="darkred"]23...Be6[/font] then White wins after [font color="darkred"]24.fxg7 Bxg7 25.Nd5 Rb7 26.Rcf2 Rf8 27.Nf6+.[/font]

• The Bishop already protects the pawn and won't protect it any better by moving to e7; Black's immediate problem is how to deal with White's threat to open the d-file.
• If [font color="red"]23...Bc8[/font] gives adequate protection to the pawn at d6 and, for the moment, to the d-file as well [/font color="red"]24.Qg4 Re7 25.Rd1[/font] (threating 26.Bxc5!) then:
• If [font color="red"]25...Rc7 26.Bxh6 Bb7 27.Bg5 Be7[/font] then:
• If [font color="red"]28.h4 Bc6 29.Rcd2 Kf8 30.Be3 Nd7 31.Qe2[/font] leaves White a pawn to the good, but still no forced win.
• [font color="burgundy"]28.Be3!? Qc8! 29.Rf2 Ba8 30.Kg1 Nd7 31.Bg5[/font] leaves Black able to exchange his way out of a cramped position.
• [font color="#C08000"]25...Nb3 26.Rf2 Kh8 27.Nb5 Reb7 28.Rd3 a4 29.Qd1[/font] gives White a palpable advantage, but direct route to victory.
• If [font color="darkred"]24.Rd2?! Nd7! 25.c5 Nf6 26.cxd6[/font] then:
• [font color="darkred"]26...Qd7 27.Bc5 Rd8 28.Re1 g6 29.Bf3 gxf5 30.Bg2[/font] gives White a fair advantage in space.
• [font color="magenta"]26...Nxh5? 27.Qxh5! Bb7 28.Ra1 Ra8 29.d7 Re7 30.Rad1[/font] gives White a whole array of winning plans, such 31.Bc5, as skewering the Rook at e7 when it has no safe move, or 31.Rd6, putting pressure on h6 in preparation for a Greek gift sacrifice.

• White rips open the center.
• If [font color="red"]24.Bxh6!? gxh6 25.Bxf7+ Kh8 26.Qh5[/font] then:
• [font color="red"]26...Bf8 27.Rg2 Re7 28.Qg6 Rxf7 29.Qxf7 Bc6 30.Re2[/font] leaves White with a Rook and two pawns for two Bishops; White must extricate the Queen from the position.
• If [font color="darkred"]26...Rf8??[/font] then [font color="darkred"]27.Qxh6#!.[/font]

• The Queen looks spledid at d5, but pinning the Bishop to Black's Queen is to be preferred.
• If [font color="red"]25.f6! Bxf6 26.Rd2! Rb7 27.Bg4[/font] then:
• If [font color="red"]27...Re6 28.Bxe6 fxe6[/font] then:
• If [font color="red"]29.b3! Bg5 30.Rd6 Qc8 31.h4[/font] then:
• If [font color="red"]31...Be7 32.Ra6[/font] then:
• [font color="red"]32...Rxb3 33.Qxb3 Qxa6 34.Qb8+ Qc8 35.Qa7 Bf8 36.Qxa5[/font] gives Black only a pawn for the exchange; White's superior activity for his heavy pieces gives him better access to Black's weak points.
• No better is [font color="burgundy"]32...a4 33.Nxa4 Rxb3 34.Ra7 Bxa4 35.Rxa4 Rb2+ 36.Kh3.[/font]
• If [font color="darkred"]31...Be3 32.Qf3 Bd4 33.Qf7+[/font] then:
• [font color="darkred"]33...Kh8 34.Qe7 Be8 35.Rf8+ Kh7 36.Rxe8 Rxe7 37.Rxc8[/font] gives Black only a pawn for the exchange; White's active Rooks in the back ranks assure victory against Black's hampered Bishop.
• [font color="magenta"]33...Kh7 34.Nd5 exd5 35.Qg6+ Kh8 36.Rf7 Qg8 37.Qxh6+!![/font] wins material after 37...hxg6 38.Rxh6+ Qh7 39.Rhxh7.
• If [font color="darkred"]29.Nb5 Qe7 30.Nd6 Rb4 31.h4[/font] then:
• If [font color="darkred"]31...Ba4 32.Qg4 Kh7[/font] then:
• If [font color="darkred"]33.Ra1 Qd7 34.Ra3 Rb6 35.Rad3[/font] then:
• If [font color="darkred"]35...Rb4 36.Qh5 Rb3 37.Qe2 Qc7 38.Qg4[/font] then:
• [font color="darkred"]38...Qe7 39.Rxb3 Bxb3 40.Nc8 Qe8 41.Nb6 Bd8 42.Nd7[/font] leaves all of White's pieces active; Black has only a pawn for the exchange.
• If [font color="magenta"]38...Qd7 39.Qe2 Qc7 40.Ne8[/font] then:
• [font color="magenta"]40...Qe7 41.Nxf6+ Qxf6 42.Rxb3 Bxb3 43.Rd7 Ba4 44.Ra7[/font] assures White of the full advantage of teh exchange.
• If [font color="darkorange"]40...Qb7[/font] then White wins after [font color="darkorange"]41.Rxb3 Qxb3 42.Nxf6+ gxf6 43.Qf2 Kg6 44.Qxc5.[/font]
• [font color="purple"]35...Rb3 36.Qe2 Qc7 37.Qg4 Qd7 38.Qe2[/font] continues to give White the exchange for a weak pawn; White holds a powerful position on top of that.
• [font color="darkorange"]33.Rf3 Rb8 34.Ra3 Rb4 35.Kg2 Qd7 36.Rad3[/font] gives White the exchange for a crippled pawn.
• [font color="magenta"]31...Kh7 32.Nf5! exf5 33.Rxd7 Rxb2+ 34.Kh3 Qe6 35.Rxf5[/font] still gives White the exchange for only a pawn.
• If [font color="darkorchid"]27...Re7[/font] then White wins easily after [font color="darkorchid"]28.Nd5 Kf8 29.Nxf6 gxf6 30.Rxf6 Qe8 31.Rxh6.[/font]

[center]BLACK: Wang Hao[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 25.Qd1d5[/center]

• This is the only way Black can maintain his f-pawn, which give him faint hopes of actually saveing the game.

• White is two pawns up with the initiative.

• One of the best things one can do with a material advantage is exchange pieces. Remove all the pieces from the board and White has an easy win.

• [font color="red"]30...Rb7 31.Rd6 Be7 32.Ra6 Bxc5 33.Rxa5 Bd4 34.Rd5[/font] continues to gives White two extra pawns.

[center]BLACK: Wang Hao[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 32...ab4:N[/center]

• The exchange sacrifice is the only way for White to maintain a winning advantage.
• If [font color="red"]33.Rcd2? Bxd1! 34.Rxd1 Bxb2 35.Rd7 Be5 36.Bd1[/font] cuts White to a small advantage in space.

• [font color="red"]34...Bxb2 35.Rxb4 Be5 36.c6 Rb8 37.Rb7 Rc8 38.Ba4[/font] gives White two extra pawns, but his chances of winning dininish greatly if Rooks are exchanged.

• If [font color="red"]35...Rd4 36.c6 Rxc4 37.Bxc4[/font] then:
• [font color="red"]37...Be5 38.b3 Bc7 39.Kg2 Be5 40.Kf3 Kf8 41.Bd5[/font] gives Black two extra pawns, but Black's Bishop keeps them both in check from e5.
• If [font color="darkred"]37...Bxb2?[/font] then [font color="darkred"]38.c7![/font] wins immediately.

• From here, Black must take two moves to get the Rook behind the pawn.
• If [font color="red"]36...Rd4[/font] then:
• [font color="red"]37.c6 Rxc4 38.Bxc4 Be5 39.Kg2 Bb8 40.b3[/font] leaves White with an extra pawn and a passer at that, but the opposite-colored Bishops once agaisn favor the defender and White still does not have a convincing victory at hand.
• [font color="darkred"]37.Rxd4 Bxd4 38.c6 Be5 39.g4 Bd6 40.Kg2[/font] gives White two extra pawns, but Black's Bishop keeps either from advancing.

[center]BLACK: Wang Hao[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 36...Rd2b2:p[/center]

• White eliminates Black's best hope and covers his Bishop.

• [font color="red"]38...Kf8 39.c6 Bxg3 40.Rxf7+[/font] leaves White two pawns to the good.
• Wang Siansheng resigns.

[center][/center]

[center]Vishy Anand[/center][font size="1"]Photo by Ygrek (http://commons.wikimedia.org/wiki/User:Ygrek) in Wikipedia
(Creative Commons License, Attribution/Share Alike)
[/font]

Levon Aronian - Vishy Anand [D46]
75th Tata Steel (Group A), Round 4
Wijk aan Zee, 15 January 2013

Semi-Slav Queen's Gambit: Meran Defense

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bd6

• For notes up to here, see Carlsen-Shirov, IT, Biel, 2011.

[center]BLACK: Vishy Anand[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 8...Bf8d6[/center]

• The game has transposed into a Stolz Opening. See Giri-Spoelman, Dutch Ch, Boxtel, 2010.[font color="red"]10.b3 Bb7 11.Bb2 a6[/font] then:
• If [font color="red"]12.Ne4 Nxe4 13.Bxe4[/font] then:
• [font color="red"]13...Nf6!? 14.Bc2 c5 15.dxc5 Bxc5 16.Ng5 Qxd1 17.Raxd1[/font] a small advantage in space; both sides have active pieces (Carlsen-Anand, IT, Linares/Morelia, 2007).
• If [font color="darkred"]12.a4[/font] then:
• If [font color="darkred"]12...b4 13.Ne4 Nxe4 14.Bxe4 f5 15.Bd3[/font] then:
• [font color="darkred"]15...c5 16.Rc1 cxd4 17.exd4 Nf6 18.Re1 Re8 19.Ne5[/font] is equal (S. Volkov-Pavasovi, Euro Ch, Plovdiv, 2008).
• If [font color="darkred"]13...f5 14.Bd3 c5 15.a4 cxd4 16.Nxd4[/font] then:
• [font color="darkred"]16...Bxh2+ 17.Kxh2 Qh4+ 18.Kg1 Bxg2 19.Kxg2 Qg5+ 20.Kh1 Qh4+[/font] draws by repetition.
• [font color="magenta"]16...Bd5 17.f4 bxa4 18.Rxa4 Nc5 19.Ra2 Qb6 20.Ba3[/font] is equal.
• [font color="burgundy"]15...Qf6 16.Qe2 Qh6 17.a5 c5 18.Rfc1 cxd4! 19.exd4[/font] is equal (Z. Kozul-Bosiocic, Croatian Ch, Opatija, 2012).
• If [font color="magenta"]12...bxa4 13.Nxa4 c5 14.dxc5 Nxc5[/font] then:
• [font color="magenta"]15.Bxf6 Qxf6 16.Bxh7+ Kxh7 17.Qxd6 Nxa4 18.Rxa4[/font] gives White more activity (Moiseenko-Kobalia, Russian ChT, Dagomys, 2008).
• [font color="darkorange"]15.Nxc5 Bxc5 16.Qe2 a5 17.Rfd1 Qe7 18.Ng5[/font] gives White a small advantage in space (Bhat-Potkin, Op, Philadelphia, 2009).

• This position can be reached from the Wade Defense.

• If [font color="red"]11.e4 e5 12.h3 Re8[/font] then:
• If [font color="red"]13.dxe5 Nxe5 14.Nxe5 Bxe5 15.Be3[/font] then:
• If [font color="red"]15...Qe7[/font] then:
• If [font color="red"]16.Rfd1 a6[/font] then:
• If [font color="red"]17.Ne2 c5 18.Bxc5 Qc7 19.f3[/font] then:
• If [font color="red"]19...Bxb2 20.Qxb2 Qxc5+ 21.Qd4 Qe7 22.Bc2[/font] then:
• [font color="red"]22...Bd5!? 23.exd5 Qxe2 24.Bb3 a5 25.d6[/font] gives White a dangerous passed pawn; Black has the advantage in space, but take measures against the pawn immediately(Topalov-Aronian, Pearl Spring IT, Nanjing, 2008).
• [font color="burgundy"]22...Rac8 23.Bb3 a5 24.a3 g6 25.Qe3 Red8[/font] remains equal
• [font color="#C08000"]22.Rab1 Rad8 23.Qb4 Rd6 24.Nc3 Nh5 25.Bf1 Rxd1 26.Nxd1[/font] is equal (Krämer-Shirov, Bundesliga 1011, Hamburg, 2010).
• [font color="darkpink"]19...Rac8?! 20.Rac1! Qb8 21.Qd2 Red8 22.Be3[/font] leaves White with an extra pawn.
• [font color="darkorchid"]17.a4 Rac8 18.f3 Nh5 19.Qf2 Bg3 20.Qf1[/font] draw (de Jong-C. Horvath, Op, Leiden, 2012).
• [font color="#C00080"]16.Ne2 Rad8 17.f4 Rxd3 18.Qxd3 Bxb2 19.Rab1[/font] is equal (Kononenko-M. Medic, Euro ChW, Warsaw, 2001).
• If [font color="darkred"]15...a6[/font] then:
• If [font color="darkred"]16.Rfd1 Qc7 17.a4 Rac8 18.Rac1[/font] then:
• [font color="darkred"]18...Qa5 19.f4 Bxc3 20.bxc3 Qxa4 21.Qxa4 bxa4 22.Rb1[/font] is equal (Sasikiran-Anand, Rpd KO, Corsica, 2011).
• [font color="darkorange"]18...Bh2+ 19.Kh1 Bf4 20.Qd2 Bxe3 21.Qxe3 Qe7 22.Re1[/font] is equal (Kulots-Diermair, Euro Ch, Plovdiv, 2012).
• [font color="magenta"]16.f4 Bxc3 17.bxc3 c5 18.e5 c4 19.Bf5 g6[/font] is equal (Ponomariov-Shirov, IT, Saratov, 2011).
• [font color="darkorchid"]13.Rd1 Qc7 14.dxe5 Nxe5 15.Nxe5 Bxe5 16.Be3[/font] is equal (Sasikiran-Negi, IT, New Delhi, 2011).

• If [font color="red"]11...a5[/font] then:
• If [font color="red"]12.e4 e5[/font] then:
• If [font color="red"]13.dxe5 Nxe5 14.Nxe5 Bxe5 15.h3 Re8 16.Be3[/font] then:
• If [font color="red"]16...Qe7[/font] then:
• If [font color="red"]17.Ne2 c5 18.Bxc5 Qc7 19.f3[/font] then:
• [font color="red"]19...Bxb2 20.Ra2 Be5 21.Bxb5 Bh2+ 22.Kh1 Re5 23.Rc1[/font] gives White an extra pawn (Ivanisevic-Sedlak, Kostic Mem, Vrsac, 2010).
• [font color="burgundy"]19...Nd7 20.Bd4 Qd6 21.Bf2 Rec8 22.Qd1 Ba6 23.Rb1[/font] gives White an extra pawn and Black a small advantage in space (Gupta-Bosiocic, Op, Philadelphia, 2012).
• If [font color="darkred"]17.Rae1[/font] then:
• [font color="darkred"]17...Bxc3 18.Qxc3 Nxe4 19.Qc2 Nf6 20.Bg5[/font] is equal (Grandelius-Ter-Sahakyan, World Youth BU18, Halkidiki, Greece, 2010).
• [font color="magenta"]17...Rad8 18.Bb6 Ra8 19.f4 Nd7 20.Be3 Bxc3 21.Qxc3[/font] leaves White standing slightly better in space (Pavlovic-k. Georgiev, Serbian League, Valjevo, 2011).
• If [font color="darkred"]16...Qc7[/font] then:
• [font color="darkred"]17.Rfd1 Rad8 18.Ne2 Bd6 19.Nd4 Bh2+ 20.Kh1[/font] is equal (Akopian-Shyam, Op, Dubai, 2011).
• [font color="magenta"]17.Rad1 Rad8 18.Ne2 Bd6 19.Nd4 Nh5 20.Rfe1[/font] is equal (Kramnik-Anand, Rpd Match, Moscow, 2007).
• If [font color="darkred"]13.Rd1 Qc7[/font] then:
• If [font color="darkred"]14.h3 Rfe8 15.Be3[/font] then:
• If [font color="darkred"]15...exd4 16.Nxd4[/font] then:
• [font color="darkred"]16...Bf4 17.Bxf4 Qxf4 18.Nce2 Qd6 19.Rac1[/font] gives White a better center (Jakovenko-Grachev, Russian Ch HL, Tyumen, 2012).
• [font color="burgundy"]16...Bh2+ 17.Kh1 Bf4 18.Bxf4 Qxf4 19.Nce2 Qb8 20.Ng3[/font] gives White the advantage in space (Stefanova-Ushenina, FIDE Knock OutW, Khanty-Mansiysk, 2012).
• [font color="#C08000"]15...Rac8 16.Rac1 Qb8 17.dxe5 Nxe5 18.Nxe5 Bxe5 19.b4[/font] gives White a small advantage in space (Bacrot-Korobov, Euro Rpd Ch, Warsaw, 2011).
• If [font color="magenta"]14.Ne2 c5[/font] then:
• If [font color="magenta"]15.dxc5[/font] then:
• [font color="magenta"]15...Bxc5 16.Be3[/font] draw (Butnorius-Sakalauskas, Lithuanian Ch, Siauliai, 2007).
• If [font color="darkorange"]15...Qxc5[/font] then:
• [font color="darkorange"]16.Bg5 Qxc2 17.Bxc2 Bxe4 18.Rxd6 Bxc2 19.Bxf6 Nxf6[/font] is equal.
• [font color="purple"]16.Be3 Qxc2 17.Bxc2 Bc5 18.Bxc5 Nxc5 19.Nxe5 Rfe8[/font] is equal
• If [font color="darkorange"]15.dxe5?! Nxe5! 16.Nxe5 Bxe5[/font] then:
• [font color="darkorange"]17.f4? c4 18.fxe5 Qb6+[/font] Black should win (Nedilko-Jelecevic, Euro Ch, Rijeka, 2010).
• [font color="purple"]17.Nc3 Bxh2+ 18.Kf1 b4 19.Nd5 Nxd5 20.exd5 g6[/font] gives Black an extra pawn.
• If [font color="darkred"]12.Bd2 Rc8[/font] then:
• If [font color="darkred"]13.Ng5 h6 14.Nge4 Be7[/font] then:
• If [font color="darkred"]15.Nxf6+ Nxf6 16.Ne4 c5 17.Nxf6+[/font] then:
• If [font color="darkred"]17...Bxf6 18.dxc5 Bxb2[/font] then:
• [font color="darkred"]19.Bxa5 Qxa5 20.Qxb2 Rxc5 21.Qb4 Qc7 22.Rfb1[/font] is equal (Koneru-Houska, FIDE Knock OutW, Antalya, 2010).
• [font color="hotpink"]19.Bh7+ Kh8 20.Qxb2 Kxh7 21.Rac1 Bc6 22.f3[/font] gives White the advanced passer (Onischuk-Jakovenko, IT, Foros, 2008).
• [font color="purple"]17...gxf6 18.Rae1 f5 19.Qd1 Bg5 20.e4 Qxd4 21.Bc3[/font] is equal (Topalov-Ivanchuk, IT, Bucharest,, 2012).
• [font color="darkorange"]15.Qb1 b4 16.axb4 axb4 17.Nxf6+ Nxf6 18.Na4 c5[/font] is equal (K. Georgiev-Lemos. Op, Gibraltar, 2011).
• [font color="magenta"]13.e4 e5 14.Rfe1 exd4 15.Nxd4 Ne5 16.Bf1[/font] is equal (Khairismatullin-Potkin, Russian Ch HL, Novokuznetsk, 2008).
• If [font color="blue"]11...a6[/font] then:
• If [font color="blue"]12.Ng5!? Bxh2+! 13.Kxh2[/font] then:
• If [font color="blue"]13...Ng4+ 14.Kg1 Qxg5 15.f3 Ngf6 16.e4[/font] then:
• If [font color="blue"]16...Qh4 17.Be3 e5 18.Ne2[/font] then:
• [font color="blue"]18...Nh5 19.Qd2 h6 20.Rfd1 Rae8 21.Bc2 Re6 22.Bf2 Qe7[/font] is equal (Anand-Aronian, IT, Linares, 2009).
• [font color="#0080C0"]18...Rad8 19.a4 Nh5 20.axb5 axb5 21.Ra7[/font] is equal (Jakovenko-Frolyanov, Russian ChT, Olginka, 2011).
• If [font color="darkblue"]16...Qg3!?[/font] then:
• If [font color="darkblue"]17.Ne2!?[/font] then:
• If [font color="darkblue"]17...Qc7?[/font] then:
• [font color="darkblue"]18.Be3? e5 19.b4 Rac8 20.Rac1 exd4 21.Nxd4 c5 22.Nf5[/font] gives White a small advantage in space (Botsari-Themeli, Greek League, Eretria, 2011).
• [font color="steelblue"]18.e5! h6 19.exf6 Nxf6 20.Qc5 Nd5 21.Bd2[/font] gives White more freedom, the Bishop pair and an impressive advantage in space.
• [font color="slateblue"]17...Qh4 18.e5 Nd5 19.g3 Qh5 20.Rf2 [/font] leaves White with a slight advantage in space.
• If [font color="dodgerblue"]17.e5! Nxe5[/font] then:
• [font color="dodgerblue"]18.Ne2 Nxf3+ 19.Rxf3 Qe1+ 20.Rf1 Qh4 21.Qc5[/font] gives White a small advantage in space.
• [font color="darkcyan"]18.dxe5 Qxe5 19.Be4 Qc5+ 20.Rf2 a5 21.Bf4[/font] gives White a small advantage in space.
• If [font color="darkblue"]13...h6? 14.Nh7![/font] then:
• If [font color="darkblue"]14...Nxh7 15.Bxh7+ Kh8 16.Be4[/font] then:
• [font color="darkblue"]16...c5 17.Bxb7 Qb8+ 18.Kg1 Qxb7 19.dxc5[/font] leaves White a piece to the good.
• [font color="darkcyan"]16...Kg8 17.Ne2 f5 18.Bf3 Qf6 19.Ng3 a5 20.Rd1[/font] leaves White a piece to the good.
• If [font color="dodgerblue"]14...Qc7+[/font] then White remains a piece up after [font color="dodgerblue"]15.g3 Ng4+ 16.Kh3 Rfe8 17.f3 Ngf6 18.Nxf6+ Nxf6 19.Ne4.[/font]
• If [font color="darkblue"]12.b4 a5 13.Rb1[/font] then:
• If [font color="darkblue"]13...axb4 14.axb4 Qe7 15.e4 e5[/font] then:
• If [font color="darkblue"]16.Ne2 Bxb4 17.Ng3[/font] then:
• If [font color="darkblue"]17...g6 18.dxe5 Ng4 19.Bg5 Qc5 20.e6[/font] then:
• If [font color="darkblue"]20...Nde5 21.Nxe5 Nxe5 22.Bf6 Qxc2 23.Bxc2[/font] then:
• [font color="darkblue"]23...Bd6 24.Bb3 fxe6 25.Bxe6+ Nf7 26.f4[/font] gives White a slight advantage in space (Svidler-Karjakin, Grand Prix, Baku, 2008).
• [font color="#0080C0"]23...Ng4 24.e5 Ba3 25.exf7+ Kxf7 26.Ne4 Nxf6 27.exf6[/font] is equal (Cvitvan-Ostovic, Op, Zagreb, 2012).
• If [font color="dodgerblue"]20...fxe6 21.Qb3 Nde5[/font] then:
• [font color="dodgerblue"]22.Qxe6+ Rf7 23.Nxe5 Nxe5 24.Be2[/font] gives White a slight advantage (Morozevich-Navara, IT 1011, Reggio Emilia, 2011).
• [font color="darkcyan"]22.Nxe5 Nxe5 23.Be2 Ba3 24.Qxe6+ Nf7 25.Be3 Qe7[/font] is equal (Nezad-Sethuramen, Asian Ch, Ho Chi Minh City, 2012).
• If [font color="dodgerblue"]17...exd4 18.e5 Nxe5 19.Nxe5 c5[/font] then:
• If [font color="dodgerblue"]20.Bf4 c4[/font] then:
• If [font color="dodgerblue"]21.Bf5!?[/font] then:
• If [font color="dodgerblue"]21...d3!?[/font] then:
• If [font color="dodgerblue"]22.Qd1?! Nd5! 23.Qg4 Nxf4 24.Qxf4[/font] then:
• [font color="dodgerblue"]24...g6?! 25.Nd7! Rfd8[/font] is equal (Danielian-Ruan Lufei, Grand PrixW, Shenzhen, 2011).
• [font color="#0080C0"]24...Bd2 25.Qxd2 Qxe5 26.Bxd3 cxd3 27.Qxd3 Qd5[/font] gives Black a comfortable game.
• [font color="#8000C0"]22.Nxd3! cxd3 23.Qxd3 Rfd8 24.Qxb5 Nd5 25.Bg5[/font] is equal.
• [font color="steelblue"]21...Kh8 22.Nxc4 bxc4 23.Bg5 Bc8[/font] gives Black two extra pawns, but White has a more active Bishop pair.
• [font color="slateblue"]21.Nf5 Qc5 22.Nxc4 bxc4 23.Bd6 Qa5[/font] is equal.
• [font color="darkcyan"]20.f4 c4 21.Bxc4 bxc4 22.Qxc4 Nd5 23.Nf5 Qf6[/font] gives Black an extra pawn and White more space (N. Das-Smeets, Op, Sants, 2011).
• If [font color="dodgerblue"]16.dxe5 Nxe5 17.Nxe5[/font] then:
• If [font color="dodgerblue"]17...Bxe5 18.Ne2 Qe6 19.f4[/font] then:
• If [font color="dodgerblue"]19...Ra2 20.Qd1 Ba1[/font] then:
• [font color="dodgerblue"]21.e5? c5 22.exf6 Bd4+ 23.Rf2 Bxf2+ 24.Kxf2 Qd5[/font] Black soon won (Gelfand-Anand, Amber Blind, Nice, 2008).
• [font color="steelblue"]21.Be3 Rfa8 22.Nc1 R2a3 23.Qc2[/font] is equal.
• [font color="slateblue"]19...Bc7 20.e5 Ra2 21.Bb2 Nd5 22.Bxh7+ Kh8 23.Bf5[/font] gives White an extra pawn and greater activity (Kasparov-Kramnik, Blitz IT, Moscow, 1998).
• [font color="darkcyan"]17...Qxe5 18.f4 Qd4+ 19.Kh1 Bxb4 20.Bb2 Qc5 21.e5[/font] is equal (Galyas-Müller, Bundesliga 0708, Germany, 2008).
• If [font color="dodgerblue"]13...Qe7 14.Qb3[/font] then:
• [font color="dodgerblue"]14...axb4 15.axb4 Nd5 16.Nxd5 exd5[/font] is equal (Govciyan-D. Mastrovasilios, World Youth BU18, Oropesa del Mar, 2001).
• [font color="darkcyan"]14...e5 15.Bf5 Rfe8 16.Rd1 Nb6 17.bxa5 Nc4[/font is equal(Kaidanov-al-Sayeed, Op, Gibraltar, 2007).

• If [font color="red"]12.Rd1[/font] then:
• If [font color="red"]12...c5 13.Nxb5 Bxf3 14.gxf3 Bb8[/font] then:
• If [font color="red"]15.Qe2 Nd5 16.f4[/font] then:
• If [font color="red"]16...Qh4 17.Qf3 Kh8 18.Nc3 f5 19.Nxd5 exd5 20.Bd2 cxd4[/font] then:
• [font color="red"]21.Qxd5 Nf6 22.Qf3 Ne4 23.Bxe4 fxe4 24.Qxe4[/font] gives White two extra pawns against Black's active pieces (Dr. Glaser-Johansson, Corres, 2001).
• [font color="burgundy"]21.exd4 Rc6 22.Rac1 Rg6+ 23.Kf1 Qxh2 24.Be3 Qh4[/font] is equal (Kachiani-Chiburdamidze, FIDE Knock OutW, Groningen, 1997).
• If [font color="darkred"]16...cxd4 17.Nxd4[/font] then:
• If [font color="darkred"]17...e5 18.Nf3[/font] then:
• [font color="darkred"]18...Qf6? 19.Ng5! g6 20.Ba6 exf4 21.Rxd5 Rce8 22.Bd2[/font] gives White more activity and more potent threats (Epishin-Shabalov, Soviet Ch, Moscow, 1991).
• [font color="darkorange"]18...Rc5 19.fxe5 Nxe5 20.Nxe5 Qg5+ 21.Ng4 h5 22.h3[/font] gives White an extra piece.
• [font color="magenta"]17...Qf6 18.Ba6 Rc5 19.Qf3 e5 20.Nb3[/font] gives White an extra pawn at the high cost of a breached castled position.
• [font color="burgundy"]15.Bf1!? cxd4! 16.Qe2 dxe3 17.fxe3 Qb6[/font] gives Black a small advantage in space (Laznicka-Negi, IT, New Delhi, 2011).
• If [font color="darkred"]12...a5[/font] then:
• [font color="darkred"]13.Ne5 b4 14.axb4 axb4 15.Nxd7 Qxd7 16.Na4[/font] gives White a small advantage in space (Rodshtein-Xie Deshun, Aeroflot Op, Moscow, 2011).
• If [font color="magenta"]13.e4 e5[/font] then:
• [font color="magenta"]14.Ne2!? c5! 15.dxe5 Nxe5 16.Nxe5 Bxe5 17.Bxb5 Qb6[/font] gives Black a small advantage in space (V. Popov-Dreev, Russian Ch HL, Ulan Ude, 2009).
• [font color="darkorange"]14.Bf1 Qe7 15.g3 Rcd8 16.Bg2 Rfe8 17.Be3[/font] gives White a small advantage in space.

• The world champion introduces a pawn sacrifice, but it proves to be unsound.
• [font color="red"]12...Bxh2+ 13.Kxh2 Ng4+ 14.Kg1 Qxg5 15.f3 Ngf6[/font] gives Black a small advantage in space (Wojteszek-Negi, Bundesliga 1112, Hamburg, 2011).

[center]BLACK: Vishy Anand[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 12...c6c5[/center]

• White has an extra pawn.

• If [font color="red"]14.h3[/font] then:
• [font color="red"]14...Bh2+ 15.Kh1 Qh4 16.d5 Rfd8 17.Bd2 b4[/font] gives Black a strong game with good winning chances.
• If [font color="darkred"]14...Re8?[/font] then White wins after [font color="darkred"]15.hxg4 b4 16.Ne4 Bxe4 17.Bxe4 cxd4 18.Qd1.[/font]

• White should take the Rook at f8 first, then there will be plenty ogf time for the pawn.
• [font color="red"]15.Nxf8 Bxf8 16.exd4 Ndf6 17.Kh1 Qxd4 18.Qe2[/font] remains equal.

• Black takes a slight advantage.

• Black will remain a piece up; there is no way for White save the game after this.
• After [font color="red"]16.dxc5 Nxc5 ,[/font] if [font color="red"]17.Nxf8[/font] then [font color="red"]17...Nxd3 18.h3 Qd4+ 19.Kh1 Ndf2+[/font] recovers the exchange, but White's game is survivable.

[center]BLACK: Vishy Anand[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 16.Bd3e2[/center]

• After this, all roads lead to a White victory.
• [font color="red"]16...Bxd4+? 17.Kh1! Nxh2 18.Ng5 Be4 19.Qxe4 Nf6[/font] gives White only a small advantage with an extra pawn and a slight initiative against White's superiority in space.

• If [font color="red"]17.fxe5[/font] then [font color="red"]17...Qxd4+ 18.Kh1 Qg1+ 19.Rxg1 Nf2#.[/font]

[center]BLACK: Vishy Anand[/center]

[center][/center]

[center]WHITE: Levon Aronian[/center][center]Position after 18.Kg1h1[/center]

• Black can let White take the exchange because he knows he has all the time he needs to lauch a fierce attack.

• If [font color="red"]19.Ng5 f5 20.Qd3 Bxc3 21.Qxd8 Rfxd8[/font] then:
• If [font color="red"]22.bxc3[/font] then Black wins after [font color="red"]22...Rxc3 23.Ra2 Bd5 24.Rb2 Rdc8 25.Bd2 Rxa3.[/font]
• If [font color="darkred"]22.Nxe6[/font] then Black wins in a cakewalk after [font color="darkred"]22...Rd6 23.bxc3 Rxe6 24.Ra2 Rh6.[/font]

• [font color="red"]20.Qd3 Qh4 21.Qg3 Qxg3 22.hxg3 Kxf8 23.Rd1 Nf2+[/font] wins the Rook and leaves Black a piece to the good.

• If [font color="red"]21.Qd3 Qxg6 22.Qg3 Kf7 23.h3 Rh8[/font] then:
• [font color="red"]24.Nd1 25.Rf3 Rh6 26.Rd3 Nf2+ 27.Nxf2 Rg6[/font] traps the Queen.
• If [font color="darkred"]24.Ne2 Bf2 25.Qc3 Bb6 26.Qg3 Rh6[/font] then:
• If [font color="darkred"]27.Bd2 Ne5 28.Rf3 Nxf3[/font] then:
• If [font color="darkred"]29.gxf3 Qh5 30.Rg1 Qxh3+ 31.Qxh3 Rxh3+ 32.Kg2 Rxf3[/font] gives White two extra pawns and all pieces active in the mating attack.
• If [font color="darkorange"]29.Qxg6+[/font] then [font color="darkorange"]29...Rxg6 30.gxf3 Bxf3+ 31.Kh2 Rg2+ 32.Kh1 Rxe2#.[/font]
• [font color="magenta"]27.a4 b4 28.Be3 Nxe3 29.Rf3 Qh5 30.a5 Bxf3[/font] leaves Black a piece to the good.

• If [font color="red"]22...Rd8 23.Bd2 Bb6 24.Rac1 Qh6[/font] then:
• [font color="red"]25.Ne4 Bxe4 26.Rc3 e5 27.b4 Kh7 28.Rg3 a6[/font] Zugzwang! White is out of reserve pawn tempi and he must begin losing material.
• I[font color="darkred"]25.Rf3 Rxd2 26.Qxd2 Bxf3 27.Qd8+ Kh7 28.h4[/font] allows mate in three starting with [font color="darkred"]28...Qxf4.[/font]

• White has no move that won't cost him more material.
• P-n Aronian resigns.

[center][/center]

[center]Sergey Karjakin
[/center][font size="1"]Photo by Stefan64 (http://commons.wikimedia.org/wiki/User:Stefan64) from Wikipedia (http://en.wikipedia.org/wiki/Sergey_Karjakin)
(Creative Commons License, Attribution/Share Alike)
[/font]

Sergey Karjakin - Loek Van Wely
75th Tata Steel International Tournament (Group A), Round 13
Wijk aan Zee, 27 January 2013

Open Rat Sicilian Game: Dragon Defense (Yugoslav Opening)

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 Nc6 8.Qd2 0-0 9.0-0-0 d5 10.exd5 Nxd5 11.Nxc6 bxc6 12.Bd4 Bxd4 13.Qxd4 Qb6 14.Na4

• For moves and variations to this point, see Sjugirov-Timofeev, Russian Ch HL, Taganrog, 2011.

• If [font color="red"]14...Qa5 15.b3[/font] then:
• If [font color="red"]15...Be6[/font] then:
• [font color="red"]16.g3 Rfd8 17.Qc5 Qc7 18.Re1 Nb6 19.Nc3 a5[/font] is equal (Sjurirov-Timofeev, Russian Ch HL, Taganrog, 2011).
• [font color="burgundy"]16.Qd2 Qc7 17.Nc5 Qd6 18.Nxe6 Qxe6 19.Bc4[/font] gives Black a small advantage in space; White has pressure on d5 (Korneev-Aronian, Russian Cup, Omsk, 1996).
• If [font color="darkred"]15...Qc7 16.h4 h5 17.Bc4 Rd8[/font] then:
• If [font color="darkred"]18.g4 hxg4 19.h5 g5 20.fxg4 Qf4+ 21.Qxf4 gxf4 22.Nc3[/font] gives White a passed pawn, the advantage in space and a pin at d5; Black is attacking the backward pawn at g4 (Swinkles-Reinderman, Op, Groningen, 2009).).
• [font color="magenta"]18.Rhe1 Bf5 19.Qe5 Qxe5 20.Rxe5[/font] is equal (Sebag-Calzetta Ruiz, Euro ChTW, Novi Sad, 2009).

• If [font color="red"]16.Bb3[/font] then:
• If [font color="red"]16...Be6 17.Nc5 Nf4 18.Nxe6 Nxe6[/font] then:
• If [font color="red"]19.Qe3 Nf4 20.g3 Nd5[/font] then:
• If [font color="red"]21.Qg5 e6[/font] then:
• [font color="red"]22.Rhe1 a5 23.a4 Rab8 24.Qe5 Qxe5 25.Rxe5 Rb4[/font] is equal (Leko-Van Wely, IT A Rd 11, Wijk aan Zee, 2013).
• [font color="burgundy"]22.h4 h6 23.Qxh6 Qxg3 24.h5 Qf4+ 25.Qxf4 Nxf4[/font] is equal (Hagen-Pavlidis, Euro Ch Rd 11, Plovdiv, 2012).
• If [font color="darkred"]21.Qe4 e6[/font] then:
• [font color="darkred"]22.f4 Nf6 23.Qf3 c5 24.Bc4 Rab8 25.Rxd8+ Rxd8[/font] is equal (Rublevsky-Cmilyte, Euro Ch, Aix-les-Bains, 2011).
• [font color="magenta"]22.Rhe1 Rab8 23.f4 Qa5 24.a3 Qb6 25.Qe5 c5[/font] is equal (Hristodoulou-Pavlidis, Euro Ch Rd 7, Plovdiv, 2012).
• [font color="burgundy"]19.Qh4 Ng7 20.Qc4 e6 21.g4 Rd5 22.Qa4 Rdd8[/font] is equal.
• If [font color="darkred"]16...Bf5[/font] then:
• [font color="darkred"]17.g3 Rd6 18.Rhe1 Rad8 19.Qc5 Qd7 20.Qg1[/font] gives White a slight edge in space (Grischuk-Motylev, Rpd Cup, Odessa, 2010).
• [font color="magenta"]17.g4 Nf4 18.Qe3 Be6 19.h4 Bxb3 20.axb3 Ng2[/font] is equal (Carlsen-Ivanchuk, Rpd KO, León, 2009).

• This is an unusual and ultimately not very successful attempt to meet head on the boilerplate plan of a pawn advnce against the dragon's nest.
• [font color="red"]17...Nb6!? [/font] (rated best by Fritz and Rybka) then:
• [font color="red"] 18.Qc3!? 18...h5 19.g3 e6 20.Rhe1 Nd5 21.Qc4 [/font] (A. Muzychuk-Cmilyte, Wuro Club CupW, Eliat, 2012).
• [font color="darkred"]18.Qe3! Nd5 19.Qg5 a5 20.h4 Nf4 21.Rde1 [/font] gives White stronger pawns and a small advantage in space.
• Interesting, but not particularly good, is [font color="blue"]; 17...e5!? 18.Qf2! [/font] when:
• If [font color="blue"] 18...Nf4 19.g3 [/font] then:
• [font color="blue"] 19...Ne6 20.Nxe6 Bxe6 21.Rxd8+ Rxd8 22.Bxe6 fxe6 23.Re1 [/font] gives White a small advantage with stronger pawns.
• [font color="#0080C0"]19...Nd5 20.g4 Be6 21.Nxe6 fxe6 22.Rhe1 a5 23.a4 [/font] gives White command of the center and stronger pawns.
• If [font color="darkblue"]18...Qe7 19.g4 [/font] then:
• If [font color="darkblue"] 19...Bc8 20.Rhe1 [/font] then:
• If [font color="darkblue"] 20...a5 21.Nd3 a4 22.Rxe5 [/font] then:
• [font color="darkblue"] 22...Be6 23.Bxd5 Rxd5 24.a3 Rxe5 25.Nxe5 [/font]
• [font color="#4000FF"]22...Qf6 23.Bxd5 Rxd5 24.Rxd5 cxd5 25.a3 Bb7 26.f4 [/font] fewer pawn waeknesses and more space.
• If [font color="dodgerblue"]20...Qg5+ 21.Rd2 [/font] then:
• If [font color="dodgerblue"] 21...Qe7 22.c4 [/font] then:
• If [font color="dodgerblue"] 22...Nf4 23.Rxd8+ Qxd8 24.Rxe5 Ne6 [/font] then:
• [font color="dodgerblue"] 25.h4 Qf6 26.Nd3 a5 27.Bc2 Ng7 28.Re4 [/font] gives White better control of the center, more space and stronger pawns.
• [font color="steelblue"]25.Ba4 Nxc5 26.Qxc5 Be6 27.Qe3 Qd6 28.c5 [/font]
• [font color="slateblue"]22...Nf6 23.Rde2 Nd7 24.Nxd7 Bxd7 25.Rxe5 Qf6 26.Qg3 [/font] gives White an extra pawn, stronger pawns and more space, but Black has several options that can generate counterplay.
• [font color="darkcyan"]21...Nc7 22.Nd3 Be6 23.Bxe6 Nxe6 24.Rxe5 Qf6 25.f4 [/font] gives White an extra pawn and stronger pawns; the kingside advance is still playable.
• If [font color="dodgerblue"]19...Be6 20.Rhe1 [/font] then:
• If [font color="dodgerblue"] 20...Qf6 21.Rd2 [/font] then:
• [font color="dodgerblue"] 21...Nc7 22.Rxd8+ Rxd8 23.Nd3 Bxb3 24.axb3 Nd5 25.Nxe5 [/font] gives White a weak extra pawn.
• [font color="slateblue"]21...a5 22.a3 Nf4 23.Bxe6 Nxe6 24.Nd7 Qf4 25.Re4 [/font] gives White stronger pawns and the initiative; the Queen must retreat to h6, a poor square.
• [font color="darkcyan"]20...Nf4 21.Rxd8+ Rxd8 22.Rxe5 Qd6 23.Re1 Bxb3 24.Nxb3 [/font] gives White an extra pawn and Black more active pieces and command of the d-file.
• If [font color="#008000"]17...Nf4 [/font] (rated best by Houdini) [font color="#008000"] 18.Qf2 Rxd1+ 19.Rxd1 Rd8 [/font] then:
• [font color="#008000"] 20.Re1 h5 21.a3 e6 22.g3 Nd5 23.Rd1 [/font] is equal.
• [font color="#40C000"]20.Rxd8+ Qxd8 21.g4 Bc8 22.a4 h6 23.Qe3 Qd6 [/font] is equal.

[center]BLACK: Loek Van Wely[/center]

[center][/center]

[center]WHITE: Sergey Karjakin[/center][center]Position after 17...h7h5[/center]

• White has a small advantage in space. and still has the option to launch a pawns advance.
• [font color="red"]18.Rhe1!? Nb6 19.Qe3 Rxd1+ 20.Rxd1 Qxh2 21.Qxe7 Nd5[/font] is equal (A. Muzychuk-Cmilyte, Grand Prix W, Ankara, 2012).

• [font color="red"]18...Nf4 19.Qe3 hxg4 20.Na6 Ne2+ 21.Qxe2 Qf4+ 22.Kb1[/font] gives White a small advantage in space.

• White puts his heavy pieces behind the kingside pawns to support their advance.

• If [font color="red"]20...Bc8? 21.gxh5[/font] then:
• If [font color="red"]21...Kg7 22.hxg6[/font] then:
• If [font color="red"]22...fxg6[/font] then White wins after [font color="red"]23.h4 Qe7 24.h5 g5 25.h6+ Kg6 26.h7.[/font]
• If [font color="magenta"]22...Nh3[/font] then White wins after [font color="magenta"]23.Qg3 f6 24.Qh4 Rh8 25.Qc4 a5 26.Rd1.[/font]
• If [font color="darkred"]21...Nxh5[/font] then White wins after [font color="darkred"]22.Qxg6+! Kf8 23.Qxh5 Rd6 24.Rxe5.[/font]

• White leaves his Knight hanging,
• [font color="red"]22.h4 Qe7 23.Kb1 Rb8 24.Ne4 Rb4 25.a3[/font] gives White an embryonic kingside attack with good winning chances; Black must retreat his Rook.

• Black's best attempt is to go for counterplay on the queenside.
• If [font color="red"]22...Rb8!? 23.Rhf1 Rb4[/font] then:
• [font color="red"]24.Kb1! Kg7 25.Ka1 a5 26.h4 Rbd4 27.a3[/font gives White a good game with kingside pawns ready to pry open Black's King position.
• If [font color="darkred"]24.Nd3!? Ba6![/font] then:
• [font color="darkred"]25.Nxb4 Bxf1 26.Qe3 Bb5 27.c4 Qa5 28.a3 Nd3+[/font] is equal.
• If [font color="magenta"]25.Nxf4?[/font] then Black wins after [font color="magenta"]25...Bxf1! 26.Rxf1 Rxf4 27.Re1 Qd7 28.Qd3 Rxg4.[/font]
• [font color="blue"]22...Qd6?! 23.Ne4! Qe7 24.h4 Be6 25.Bxe6 Qxe6 26.Kb1[/font] leaves Black's queenside weak and his kingside under attack.

• The position demands of Black immediate propylactic measures.
• If [font color="red"]23...Kg7! 24.Ne4[/font] then:
• [font color="red"]24...Bxg4 25.Qxg4 a4 26.Bxf7 Qxf7 27.Qg5 Re8 28.Rd1[/font] gives White stronger pawns and a safer King immediate attack.
• If [font color="darkred"]24...Rf8?[/font] then White wins after [font color="darkred"]25.Qf6+! Kg8 26.h4 Nd5 27.Qg5 Be6 28.h5[/font] when Black can no longer defend against an invasion of White's forces of his King position.

[center]]BLACK: Loek Van Wely[/center]

[center][/center]

[center]WHITE: Sergey Karjakin[/center][center]Position after 23...a5a4[/center]

• [font color="red"]24...Kxf7[/font] loses to [font color="red"]25.Qh7+.[/font]

• [font color="red"]25...g5 26.Qxg5+ Kxf7 27.Rhf1 Qe7 28.Qh6 Ra5 29.Ng5+[/font] leaves White with two extra pawns and an attack on an exposed King. The game could go on for quite some time, but the result is clear.
• Mh. Van Wely resigns.

[center][/center]

[center]Barbary Macaques on Gibraltar[/center][font size="1"]<font size="1"><b>Photo by Olaf Tausch (http://commons.wikimedia.org/wiki/User:Oltau) in Wikimedia Commons (http://commons.wikimedia.org/wiki/Category:Gibraltar_Barbary_Macaques)
Creative Commons License, Attribution/Share Alike)
[/font]

[center]

• White displays no opening ambitions. He will be content with a playable game.
• For a survey of the Bogo-Indian Defense, see Araz-Ghaderpour, TT, Beirut, 2009.

• If [font color="red"]7.0-0 Bb7[/font] then:
• If [font color="red"]8.cxd5 exd5 9.Ne5 Be7[/font] then:
• If [font color="red"]10.b3 c5 11.Bb2 Nbd7[/font] then:
• If [font color="red"]12.Nxd7 Qxd7 13.dxc5 bxc5 14.e4 d4 15.Re1[/font] then:
• [font color="red"]15...Rfe8 16.Nc4 Bf8 17.Qd3 Qe6 18.Rad1 a5[/font] gives Black a small advantage in space (Krzyzanowski-Kukk, Corres, 2002).
• [font color="burgundy"]15...a5 16.a4 Qe6 17.Rc1 Ng4 18.Ba3 Ne5[/font] is equal [i(Khalifman-J. Polgar, Essent Crown, Hoogeveen, 2002).
• [font color="darkpink"]12.Rc1 Rc8 13.Rc2 Re8 14.Ndc4 Nf8 15.Ne3[/font] is equal (Ehlvest-Vyzmanavin. IT, Tilburg, 1992).
• If [font color="darkred"]10.Qc2 c5 11.dxc5 bxc5 12.Ndc4[/font] then:
• [font color="darkred"]12...Nc6 13.Nxc6 Bxc6 14.Rd1 Rc8 15.Bf4 d4 16.e4[/font] is equal (Baginskaite-Bojkovic, FIDE Knock OutW, Moscow, 2001).
• [font color="magenta"]12...Re8 13.Bf4 Qc8 14.Na5 Ba6 15.Rfd1[/font] gives White a small advantage in space. (Jussupow-A, Sokolov, IT, Tilburg, 1987)
• If [font color="darkred"]8.Ne5 Be7 9.Qc2 c5 10.dxc5 bxc5 11.Nb3[/font] then:
• [font color="darkred"]11...Na6 12.Bg5 Qc7 13.Bxf6 Bxf6 14.Ng4 Be7[/font] is equal (Zhao Xue-Roser, Op Rd 6, Gibraltar, 2013).
• [font color="magenta"]11...a5 12.cxd5 exd5 13.Bf4 Qb6 14.Rad1 Re8[/font] is equal (Timman-Ivanchuk, IT, Tilburg, 1990).

• If [font color="red"]9.0-0 Nbd7 10.b4[/font] then:
• If [font color="red"]10...c5 11.cxd5 Bxd5[/font] then:
• [font color="red"]12.e4 Bb7 13.dxc5 bxc5 14.b5 a6 15.bxa6 Rxa6[/font] is equal (D. Gurevich-Anka, Op, Las Vegas, 2001).
• [font color="magenta"]12.dxc5 bxc5 13.b5 a6 14.bxa6 Rxa6 15.Bb2 Qa8[/font] gives Black a small advantage in space (Ris-Brener, Op, Neuhausen, 2007).
• [font color="darkred"]10...dxc4 11.Nxc4 c5 12.Qb2 cxd4 13.Qxd4 Ne4 14.Bb2[/font] is equal (Kozul-Predojevic, Euro Ch, Rijeka, 2010).

• The game is equal.

• [font color="red"]11.Ndf3 h6 12.Bf4 Bd6 13.Nh4 cxd4 14.Nf5[/font] remains equal.

• White has better pawn structure, but Black's hanging center pawn duo is a dynamic advantage as long as it stays moble.

[center]BLACK: Nikita Vitiugov[/center]

[center][/center]

[center]WHITE: Athanasios Mastrovasilis[/center][center]Position after 11...bc5:p[/center]

• White neglects the restraint of Black's mobile pawns.
• If [font color="red"]13.e3 Qc7 14.Nef3 Nbd7 15.b3 Rab8 16.Bb2 Ba6[/font] remains equal.

• White has a slight advantage in space.

• [font color="red"]14...Qb6 15.Bg5 c4 16.Nc1 Nbd7 17.Bxf6 Nxf6[/font] gives Black a small advantage in space; White has slightly stronger pawns.

• White moves his Knight to a square where it is attacked three times and defended only twice.
• [font color="red"]17.Nc1 Bxf4 18.gxf4 Nc5 19.Ne5 Nfe4 20.b4 cxb3[/font] continues to give Black a small advantage in space.

[center]BLACK: Nikita Vitiugov[/center]

[center][/center]

[center]WHITE: Athanasios Mastrovasilis[/center][center]Position after 17.Nd3e5[/center]

• Black is in no hurry to take the Knight.
• If [font color="red"]17...Bxe5? 18.Bxe5! Nc5 19.Bxf6 Qxf6 20.Nd4[/font] is equal.

• Black is lost. The text move doesn't do much except grab hold of some undeveloped real estate. Black has a moble pawn duo and a suitable outpost for a Knight at e5.
• If [font color="red"]18.Rac1 Nfe4[/font] then:
• If [font color="red"]19.e3 Rad8[/font] then:
• If [font color="red"]20.h4 Kh8 21.b4 cxb3 22.Qb1[/font] then:
• If [font color="red"]22...a5 23.Ng5 Bxe5 24.Bxe5 Nxg5 25.hxg5 a4[/font] gives Black an extra pawn and the initiative.
• If [font color="darkred"]22...Rc8!?[/font] then:
• [font color="darkred"]23.Nd3! Bxf4 24.exf4 Nxd3 25.Rxd3 Rxc1+ 26.Qxc1 Qc5[/font] lets White off the hook, but Black is still vastly better.
• If [font color="magenta"]23.Bh3?[/font] then Black wins after [font color="magenta"]23...Rb8! 24.Bg4 f6 25.Nf7+ Qxf7 26.Bxd6 Nxd6 .[/font]
• If [font color="darkred"]20.Rb1 h5 21.Re1 Qf6[/font] then:
• If [font color="darkred"]22.Qd1 Re7 23.b4[/font] then:
• [font color="darkred"]23...Ne6 24.Qc1 g5 25.Ra1 gxf4 26.exf4 Bc7[/font] gives White an extra pawn, but Black's connected moble passers are more than sufficient compensation.
• [font color="darkorange"]23...cxb3 24.Qd4 Rc7 25.h4 a5 26.Bh3 a4[/font] gives Black an extra pawn, an advanced protected passer; and the advantage in space neither side has any good minor pieces and both players would be planning how to exchange them in a way that maximizes advantage.
• [font color="magenta"]22.Red1 Bxe5 23.Nxe5 Rxe5 24.Bxe5 Qxe5 25.Rd4 Rb8[/font] gives Black a solid center and greater mobeility.
• If [font color="darkred"]19.Ng4? Nb3[/font] then:
• [font color="darkred"]20.Rb1 h5 21.Bxd6 Qxd6 22.Nh4 hxg4 23.Bxe4 Qc5[/font gives Black a powerful initiative.
• [font color="magenta"]20.Bxd6 Qxd6 21.Rb1 h5 22.Ne3 Qb6! 23.Rf1 Rad8[/font] gives Black command of a web of dark squares in White's territory; Black's Knights will not be dislodged easily.

• Black has more freedom and space; Black has slightly better pawn structure, but that will only be of concern to Black as pieces fly off the board.
• If [font color="red"]18...g5[/font] then:
• If [font color="red"]19.Nxc4 Bxf4 [/font] then:
• If [font color="red"]20.Na5[/font] then Black wins after [font color="red"]20...g4 21.gxf4 gxh3 22.Nxb7 Nxb7 23.e3 Nd6 .[/font]
• If [font color="darkred"]20.gxf4 dxc4 21.fxg5 Nfe4[/font] then:
• [font color="darkred"]22.Qxc4 Ba6 23.Qc2 Nxf2 24.Kxf2 Qe3+ 25.Kg2 Bxe2[/font] gives White overwhelming piece activity in compensation for a pawn.
• [font color="magenta"]22.Bf5 Qc7 23.Rd4 Qf4 24.Bh3 Nb3 25.Rad1 Nxd4[/font] wins the exchange.
• [font color="darkorchid"]19.Bxg5 Bxe5 20.Bf5 h5 21.Bh7+ Kg7 22.Rab1 Nb3[/font] gives Black more activity and freedom

• If [font color="red"]20...Qe6 21.Nd4 Qg6[/font] then:
• [font color="red"]22.f3 h5 23.Bg2 hxg4 24.fxg4 Qxg4 gives Black an extra piece.[/font]
• If [font color="darkred"]22.b4[/font] then Black wins after [font color="darkred"]22...cxb3 23.Nxb3 Rac8 24.Nxc5 Rxc5 25.Qa4 Bc6 .[/font]

• Black misses an easy win.
• [font color="red"]22...h5 23.Nge5 fxe5 24.Nxe5 Nbc5 25.e3 Qe6[/font] gives White an extra piece.

• The sacrifice of the exchange is costly and unnecessary. White can protect his foremost f-pawn with a simple 23.e3.
• [font color="red"]23.e3 h5![/font] (making a desperado of the Knight) then:
• If [font color="red"]24.Nd4 Qb6[/font] then:
• [font color="red"]25.f3 Ned2 26.Nxf6+ Qxf6 27.Rxd2 Nxd2 28.Qxd2 Bc8[/font] gives White two minor pieces and a pawn for a Rook, but his pieces are characterized by passivity while Black's either sit on open lines or can be moved to one in just one move; Black is not losing as he was before Black's last move, but he can easily slip back into a lost position from here.
• If [font color="magenta"]25.Nxf6+[/font] (this is as dearly as the desperado can sell itself) then Black wins after [font color="magenta"]25...Nxf6 26.Nf3 Rad8 27.Ng5 Re7 28.Bf3 h4[/font]
• If [font color="darkred"]24.Nge5?[/font] then Black wins after [font color="darkred"]24...fxe5! 25.Nxe5 Nf6 26.Qf5 Rad8 27.Qg5 Qc7.[/font]

[center]BLACK: Nikita Vitiugov[/center]

[center][/center]

[center]WHITE: Athanasios Mastrovasilios[/center][center]Position after 23.Rb1c1[/center]

• Black isn't goint to stare a gift horse in the mouth.

• If [font color="red"]24...Rab8 25.Nd4 Qb6 26.Bxe4[/font] then:
• Black wins after [font color="red"]26...Rxe4! 27.Qc2 Rxd4 28.Rxd4 Qxd4 29.Ne3 Qxf4 30.h4.[/font]
• If [font color="darkred"]26...dxe4!? 27.Qxc4+! Kh8 28.Ne3 Red8[/font] then:
• [font color="darkred"]29.Ndf5 Rxd1+ 30.Nxd1 Bc8 31.Qxe4 Bxf5 32.Qxf5 Qd4[/font] allows Black to win a pawn, leaving White with only a pawn for the exchange, but he will have to work a little harder before winning now.
• [font color="magenta"]29.Qc3? Ba6! 30.b4 Bd3 31.Nc6 Rbc8 32.exd3 Rxc6[/font] leaves White with only a pawn for the exchange; Black should win from here.

• As a reult of this move, White will experience a little turbulance before landing, but his victory is secure.
• Stronger is [font color="red"]25...Kh8 26.f5 Qb6 27.Nd4 c3 28.b4 Nd2 29.Nec2 Rg8 .[/font]

• This is better than [font color="red"]26...cxb2 27.Qxb2[/font] then:
• If [font color="red"]27...Ba8 28.Nef5 Rb8[/font] then:
• If [font color="red"]29.Qa1 Kh8[/font] then:
• [font color="red"]30.e3 Nc3 31.Rc1 Rec8 32.Bf1 Rb6 33.Kh1 Bb7[/font] leaves Black a whole exchange to the good.
• [font color="burgundy"]30.Rc1 Qb6 31.Bxe4 dxe4 32.e3 Rec8 33.Rxc8+ Rxc8[/font] gives Black a whole exchange and stronger pawns.
• If [font color="darkpink"]29.Qc1[/font] then Black wins after [font color="darkpink"]29...Nc3 30.e3 Rb1 31.Qxb1 Nxb1 32.Rxb1 g6 .[/font]
• If [font color="darkred"]27...Ba6 28.Bxe4 dxe4[/font] then:
• [font color="darkred"]29.f5 Red8 30.Qb3+ Kh8 31.Qa4 Rd6 32.Kg2 Qb6[/font] leaves Black up by the exchange with more activity and space.
• [font color="magenta"]29.Qb3+ Kh8 30.Kg2 Qh5 31.Re1 Rc7 32.f5 Bc8[/font] gives Black the material advantage and a safer King.

• This is the best way to prevent 27...cxb2 with a discovered attack on the Queen.

• Black plays another sub-par move, and this time it coulod be costly.
• Black wins easily after[font color="red"]27...Qc7! 28.Ndc2 Qxf4 29.Bxe4 Rxe4 30.f3 Re5 .[/font]

• White's best move is more difficult to see than the exchange sacrifice.
• If [font color="red"]28.Nec2![/font] then after [font color="red"]28...Qc7 29.e3 Qc4 30.Bh3 Ra8 31.Bd7 Re7[/font] White's ensuing victory looks less convinving.

[center]BLACK: Nikita Vitiugov[/center]

[center][/center]

[center]WHITE: Athanasios Mastrovasilis[/center][center]Position after 28.Rc1d2:N[/center]

• Black is two exchanges to the good.

• Black also wins after [font color="red"]29...Qa6 30.Nef5 Qxa3 31.h4 Rc4 32.Nc2 Qc3 .[/font]

• If [font color="red"]32.Ne3[/font] then Black wins after [font color="red"]32...Red8 33.Qa2+ Kh8 34.Nf3 Qc7 35.f5 Qc1+ .[/font]

• Black will remain a piece to the good.
• Athanasios resigns.

[center][/center]

[center]Zhao Xue[/center][font size="1"]Photo by Leigh Atkins in Wikipedia (http://en.wikipedia.org/wiki/Zhao_Xue)
(Public Domain)
[/font]

http://www.chessgames.com/perl/chessgame?gid=1705856
José Miguel Ortega Ruiz - Zhao Xue
Tradewise Masters' Open, Round 5
Gibraltar, 26 January 2013

East India Game: Bogo-Indian Defense

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Qc2 Bb4+ 6.Bd2

• For a survey of the Bogo-Indian Defense, see Araz-Ghaderpour (http://www.democraticunderground.com/discuss/duboard.php?az=show_mesg&forum=215&topic_id=93268&mesg_id=93278), TT, Beirut, 2009.

• If [font color="red"]7.Bg2 c6 8.0-0 d5 9.b3 Nbd7 10.Rd1 0-0[/font] then:
• If [font color="red"]11.Bf4 Rc8 12.Nc3 Nh5[/font] then:
• If [font color="red"]13.Bc1 Nhf6 14.Bf4[/font] then:
• If [font color="red"]14...h6[/font] then:
• If [font color="red"]15.e4 dxc4[/font] then:
• If [font color="red"]16.Nd2 b5 17.bxc4 bxc4 18.Na4[/font] then:
• If [font color="red"]18...c5 19.d5 exd5 20.exd5 Nh5 21.Be3 Bf6 22.Rab1 Bd4[/font] then:
• [font color="red"]23.Nxc4 Bxc4 24.Qxc4 Bxe3 25.fxe3 Qg5 26.e4 Nhf6[/font] is equal (Nielsen-Sasikiran, Op 0203, Hastings, 2003).
• [font color="burgundy"]23.Re1 Re8 24.Ne4 Re5 25.Rbd1 Bxe3 26.Rxe3 Nhf6[/font] is equal (Matlakov-Sjugirov, Russian Ch HL, Taganrog, 2011).
• [font color="#C08000"]18...g5 19.Be3 c5 20.d5 exd5 21.exd5 Ng4 22.Nf1[/font] is equal (Ehlvest-Rodshtein, IT, Ashdod, Israel, 2006).
• [font color="darkpink"]16.Ne2 b5 17.bxc4 bxc4 18.Rab1 Qa5 19.Bd2 Qa3[/font] is equal (Kasimdzhanov-Kunte, Op, Mumbai, 2003).
• If [font color="darkred"]15.h3[/font] then:
• [font color="darkred"]15...Nh5 16.Bc1 f5 17.e3 Nhf6 18.Ne2 g5 19.a4[/font] leaves White standing slightly better (Jumabayev-Wang Hao, Asian Games Rpd, Guangzhou, 2010).
• [font color="magenta"]15...Re8 16.e4 dxc4 17.Nd2 b5 18.bxc4 bxc4 19.Bf1 Bb4[/font] leaves Black standing slightly better (Sasikiran-Grischuk, World ChT, Bursa, 2010).
• [font color="burgundy"]14...Nh5 15.Bc1 etc.[/font] draws.
• [font color="#C08000"]13.Bd2 Nhf6 14.e4 dxc4 15.Bf4 b5 16.bxc4 bxc4[/font] is equal (Banikas-Gheam Meghami, Ol, Torino, 2006).
• If [font color="darkred"]11.a4 c5 12.Na3 Bb7 13.Qb2[/font] then:
• If [font color="darkred"]13...Rc8 14.Rac1 Ne4 15.Be1 Bf6[/font] then:
• [font color="darkred"]16.b4 Ba8 17.e3 cxd4 18.exd4 dxc4 19.Ne5 Bg5[/font] is equal (Kramnik-Gelfand, IT A, Wijk aan Zee, 2008).
• If [font color="magenta"]16.e3 Qc7 17.Nd2 Nxd2[/font] then:
• [font color="magenta"]18.Qxd2 Qb8 19.cxd5 cxd4 20.exd4 Bxd5 21.Bxd5 exd5[/font] is equal (Le Quang Liem-Giri, IT, Dortmund, 2011).
• [font color="darkorange"]18.Bxd2 a6 19.Bc3 cxd4 20.Bxd4 Bxd4 21.Rxd4 Nf6[/font] is equal.
• If [font color="magenta"]13...Ne4 14.Be1 Bf6 15.e3[/font] then:
• [font color="magenta"]15...cxd4 16.Nxd4 Qb8 17.Rac1[/font] is equal (Piket-Kramnik, Amber Rapid, Monte Carlo, 1997).
• [font color="darkorange"]15...a6 16.b4 Rb8 17.Rac1 Qe7 18.Ne5 Rfd8 19.f4[/font] is equal (Drozdovskij-Karjakin, World Rpd Cup, Odessa, 2010).

• If [font color="red"]10.e5 Ne4 11.Nc3[/font] then:
• If [font color="red"]11...Nxc3 12.bxc3 Qd7[/font] then:
• If [font color="red"]13.Kg2 Nc6 14.c4 Nd8[/font] then:
• If [font color="red"]15.cxd5 Qxd5[/font] then:
• [font color="red"]16.Qa4+ c6 17.Rhc1 Kd7 18.Bb4 b5[/font] is equal (Carlsen-Huzman, Euro Club Cup, Kallithea, 2008).
• [font color="burgundy"]16.Qxc7 Nc6 17.Be3 0-0 18.Rhc1 Rac8 19.Qb7 [/font] gives White more activity for his pieces (Akobian-Benjamin, US Ch, St Louis, 2009).
• [font color="#C08000"]15.Be3!? c6 16.a4 Ne6 17.Rhc1 0-0 18.cxd5 cxd5[/font] is equal (E. Atalik-Zhao Xue, Ruro Club CupW, Kallithea, 2008).
• If [font color="darkred"]13.h4[/font] then:
• If [font color="darkred"]13...Nc6!? 14.Ng5[/font] then:
• [font color="darkred"]14...Bxg5 15.hxg5 0-0-0 16.Kg2 g6 17.Rh6 Rdg8 18.Rah1[/font] gives White the advantage in space and pressure along the h-file; Black's Knight is better than White's Bishop (Mohota-Wang Xianhui, Asian Ch, Subicv Bay, 2009).
• [font color="darkorange"]14...Nd8!? 15.Nxh7! Ne6 16.Kg2 c5 17.Ng5 Bxg5 18.hxg5[/font] gives White fine game; Black must castle long or exchange on h1 (Rodshtein-Bartel, Euro Ch, Budva, 2009).
• [font color="magenta"]13...h6 14.Re1 Qe6 15.Ng1 Nc6 16.Ne2 0-0-0 17.Nf4[/font] gives White a small advantage in space; Black's Bishop is better than White's (Bhat-K. Solomon, Op, Gibraltar, 2009).
• If [font color="darkred"]11...Nxd2+[/font] then:
• If [font color="darkred"]12.Qxd2[/font] then:
• [font color="darkred"]12...Qd7 13.Kg2 Nc6 14.h4 Nd8 15.Ng5 h6 16.Nh3[/font] is equal (Sachdev-Zhao Xue, Asian Games RpdW, Guangzhou, 2010).
• [font color="burgundy"]12...0-0 13.Kg2 Qd7 14.Qc2 Nc6 15.Qa4 Rfd8 16.Rac1[/font] gives White the advantage in space; Black has better prospects for the good Bishop than in other variations in this set of notes (Sargissian-Alekseev, Euro ChT, Crete, 2007).
• If [font color="magenta"]12.Nxd2 Qd7 13.f4[/font] then:
• If [font color="magenta"]13...Nc6 14.Nf3 0-0-0 15.Kg2 Kb7 16.Rac1 f5[/font] then:
• [font color="magenta"]17.Nb5 a6 18.e6 Qxe6 19.Ne5 axb5 20.Nxc6[/font] gives White a grip on the queenside; the Knight will be difficult to dislodge fro c6 (Rodshtein-S. Zhigalko, World Jr Ch, Puerto Madry, Argentina, 2009).
• [font color="burgundy"]17.a3 Rc8 18.Rhe1 Qe6 19.b4 h6 20.Re3[/font] gives White the advantage in space; Black has a good Bishop, but it is hampered by White's pawn chains (Arun Prasad-Prathamesh, Indian Ch, Mumbai, 2009).
• If [font color="darkorange"]13...c5 14.Nf3 Nc6 15.Rd1 c4 16.Kg2[/font] then:
• If [font color="darkorange"]16...0-0 17.h4 f5 18.Qe2 Qe6 19.Nh2 Bb4 20.Nf1[/font] is equal (Ragger-S. Zhigalko, Euro Ch, Rijeka, 2010).
• [font color="purple"]16...Nb4 17.Qe2 0-0 18.Nd2 Rad8 19.Nf1 Na6 20.Ne3[/font] is equal (Potkin-Zakhartsov, Russia Cup Final, Belgorod, 2010).

• White has a slight advantage with superior development and pressure in the c-file; White's isolated d-pawn is a target for Black.

• The position of the Knight here looks a bit dodgy, given that White already has heavy pieces on the c-file.
• If [font color="red"]11...Qd7 12.Rc1 c5 13.Bg5 0-0 14.dxc5[/font] gives White a small advantage.

• White cannot afford to allow the d-pawn to remain inadequately protected.
• Nevertheless, better is [font color="red"]12.Qa4 b5 13.Qb3[/font] then:
• If [font color="red"]13...Qxb3 14.axb3 a6 15.Nc3 b4 16.Nd1[/font] then:
• If [font color="red"]16...0-0-0 17.Rxa6 Kb7 18.Rxc6 Kxc6 19.Ne5+[/font] then:
• [font color="red"]19...Kb5 20.Nxf7 Rxd4 21.Be3 Rhd8 22.Bxd4 Rxd4 23.Re1[/font] is equal.
• [font color="burgundy"]19...Kb7!? 20.Nxf7 Rxd4 21.Be3 Rhd8 22.Bxd4 Rxd4 23.Re1[/font] gives White a small advantage.
• [font color="#C08000"]16...Bd6 17.Ra4 Kd7 18.Ne3 Rhb8 19.Rha1 Ne4 20.Be1[/font] is equal.
• If [font color="darkred"]a) 13...Qd7 14.Rc1[/font] then:
• [font color="darkred"]14...Rb8 15.Qc2 Rb6 16.a4 Qd5 17.Qd3 b4 18.Bf4[/font] gives White a small advantage in space.[/li
• [font color="magenta"]14...Nd8 15.Ne5 Qd5+ 16.Qxd5 Nxd5 17.Nc3 Nxc3 18.bxc3[/font] gives White a small advantage in space; Black has stronger pawns.
• If [font color="darkred"]b) 13...0-0-0 14.Qxd5 Nxd5 15.Rc1[/font] then:
• If [font color="darkred"]15...Kb7 16.Rxc6 Kxc6 17.Ne5+[/font] then:
• If [font color="darkred"]17...Kb7 18.Nxf7 Bf6 19.Nc3[/font] then:
• [font color="darkred"]19...Bxd4 20.Nxh8 Bxc3 21.Nf7 Rf8 22.Bxc3 Nxc3 23.bxc3 Rxf7[/font] gives Black a small advantage with a more ready Rook and better pawn structure.
• [font color="burgundy"]19...Rdf8 20.Nxh8 Bxd4 21.Be1 Bxc3 22.Bxc3 Nxc3 23.bxc3 Rxh8[/font] is equal.
• [font color="#C08000"]17...Kb6 18.Nxf7 Bf6 19.Nc3 Bxd4 20.Nxd5+ Rxd5 21.Nxh8[/font] gives White the advantage if he can re-activate his wayward Knight.
• If [font color="magenta"]15...Nb8!? 16.Nc3 Nxc3 17.bxc3[/font] then:
• [font color="magenta"]17...a6 18.a4 Rd5 19.axb5 Rxb5 20.Re1 Bf6 21.h4[/font] gives White more activity, better pawns and more space; Black's passed a-pawn is deadwood.
• [font color="darkorange"]17...Nc6 18.a4 b4 19.cxb4 Nxb4 20.Rc4 Nd5 21.Ne5[/font] gives White dominance of the center and more space and the threat of 22.Nxf7.

[center]BLACK: Zhao Xue[/center]

[center][/center]

[center]WHITE: José Miguel Ortega Ruiz[/center][center]Position after 12.Bd2e3[/center]

• Black sacrifices a pawn in order to get play deep in White's territory anxploit his lax development.
• font color="red"]12...0-0 13.Rc1 Nb4 14.Qxc7 Bd6 15.Qc4 Qxc4 16.Rxc4[/font] gives White an extra pawn, but Black will be able to drive White's Rook from c4.

• White has an extra pawn and a clear advantage in space. The good news for White is that his extra pawn is a passed pawn and a center pawn; the bad news is that it is isolated.

• [font color="red"]14...Qf5 15.Nc3 0-0 16.Qb1 Nc2 17.Rc1 Nxe3+ 18.fxe3[/font] still gives White an extra pawn, but Black has stronger pawns.

• White is not going to prevent the Knight from assiting in the blockade of the d-pawn.
• If [font color="red"]15.Bd2! 0-0[/font] then:
• If [font color="red"]16.Bxb4 Bxb4 17.a3[/font] then:
• [font color="red"]17...Rac8 18.Qf1 Bd6 19.Nc3 Nd5 20.Nxd5 Qxd5 21.Rc1[/font] continues to give White a weak extra pawn.
• [font color="magenta"]17...Bd6 18.Nc3 Rfe8 19.Qc2 a6 20.Qd3 b5 21.Rhc1[/font] leaves White a pawn to the good.
• [font color="darkred"]16.Nc3!? Nc6 17.Be3 Rac8 18.Qb1 h6 19.Qd3[/font] continues to give White a small advantage in space, but he is still saddled with an isolated d-pawn.
• Also good is [font color="blue"]15.Nc3 0-0 16.Qd2[/font] then:
• [font color="blue"]16...Nbd5 17.Rhe1 Rac8 18.Nxd5 Nxd5 19.a3 f5 20.Qd3[/font] still gives White the extra pawn.
• If [font color="darkblue"]16...Rfe8 17.Rac1[/font] then:
• [font color="darkblue"]17...Nbd5 18.Rhe1 h6 19.Qd3 Nxc3 20.Qxc3[/font] gives White an extra pawn, the isolated d-pawn that is now a passed pawn as well; Black will blockade it with ...Nd5.
• If [font color="dodgerblue"]17...b5 18.Rhe1 Rac8 19.a3 Nbd5 20.Nxd5[/font] then:
• [font color="dodgerblue"]20...Nxd5 21.Rxc8 Rxc8 22.Qd3 b4 23.axb4 Bxb4 24.Rc1[/font] gives White an extra pawn, currently blockaded.
• [font color="darkcyan"]20...Qxd5 21.Bf4 Bf8 22.Re5 Qb7 23.Rxe8 Rxe8 24.Qd3[/font] gives White an extra pawn and more space; White's extra pawn is isolated and easily blockaded.