Boris Gelfand vs Vasyl Ivanchuk (2013)

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Boris Gelfand vs Vasyl Ivanchuk
FIDE Grand Prix Beijing (2013), Beijing CHN, rd 8, Jul-12
King's Indian Defense: Orthodox Variation. Bayonet Attack (E97) · 1-0

ANALYSIS [x]

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Jul-12-13		JohnBoy: I don't quite get the ending of this game. Looks like the players were in increment territory here. did white miss 50.Rb6 followed by 51.Nb5?

Jul-12-13		notyetagm: Gelfand vs Ivanchuk, 2013 GM JOEL BENJAMIN GOTD FOR ROUND 8 -> https://webcast.chessclub.com/icc/i...

Jul-12-13		notyetagm: Gelfand vs Ivanchuk, 2013 <DcGentle: Gelfand should have played <51. Nb5> and should have won. Now it's not so easy.> What's the winning idea after 51 ♘c3-b5 ??? click for larger view (VARIATION) 51 ♘c3-b5 click for larger view

Jul-12-13		HeMateMe: Chuckie's king is boxed out. Can black draw if he keeps his King back, or was there a winning line for white, forcing Ivanchuk to attack with the monarch?

Jul-12-13		fgh: <What's the winning idea after 51 Nc3-b5 ???> Nb5 Rc8 Rf1 followed by Rf6 looks strong. If Ke7 (to avoid Rf6), then Rxf7+. So basically, Nb5 deflects the black rook to c8, where it can be the target of a fork.

Jul-12-13		fgh: And of course, it also enables a fork.

Jul-12-13		JohnBoy: <notyet, fgh> - is not the 51.Nb5 idea stronger with the white rook at b6 (50.Rb6) as mentioned above?

Jul-12-13		fgh: <JohnBoy>: Rb6 Ke7 Nb5 Rd7 looks balanced.

Jul-12-13		Fish55: Did Chucky flag again?

Jul-12-13		shivasuri4: <Fish55>, no, the position is simply lost for Ivanchuk.

Jul-13-13		thomastonk: In the press conference, Gelfand was asked by Anastasiya Kharlovich whether the final position was really lost. He confirmed this and showed a few moves after 72.. ♘f7 and 72.. ♖g7. Then he added that Black has only one weakness, and that's usually not enough. It seems that he did not considered 72.. ♘h7, after which White will have still some work to do. My Houdini 3 at depth 24 "sees" only +0.75 and , and so it seems to be no simple win at all. And maybe Ivanchuk missed this resource, too.

Jul-13-13		DcGentle: Gelfand had three opportunities to win faster than he did. Twice he missed tactical blows and the third time he could not recognize the way to infiltrate Black's camp, but this was not easy to see over the board. It took me quite some time to figure this myself. [Event "FIDE GP Beijing"] [Site "Beijing CHN"] [Date "2013.07.12"] [Round "8"] [White "Gelfand, B."] [Black "Ivanchuk, V."] [Result "1-0"] [ECO "E97"] [WhiteElo "2773"] [BlackElo "2733"] [Annotator "Gentle,DC"] 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Nf3 e5 7. O-O Nc6 8. d5 Ne7 9. b4 Nh5 10. g3 a5 11. bxa5 Rxa5 12. Nd2 Nf6 13. a4 Ra8 14. Nb3 c5 15. Bd2 Nd7 16. a5 f5 17. f3 Nf6 18. Qc2 h5 19. Na4 fxe4 20. fxe4 Bh3 21. Rf3 Kh7 22. Bf1 Bg4 23. Rf2 Bh6 24. Bg2 Neg8 25. Nb6 Rb8 26. Raf1 Qe7 27. h3 Bd7 28. Bxh6 Kxh6 29. Qd2+ Kg7 30. Qg5 Rf7 31. Nd2 Rbf8 32. Qh4 Nh7 33. Qxe7 Rxe7 34. Rxf8 Nxf8 35. Nf3 Nh7 36. Nxd7 (36. Nxe5 {! In order to find this tactical blow, White had to realize that rook e7 cannot defend bishop d7 anymore, because f7 is covered by White and, if Black retakes with pawn d6, a white pawn will occupy this square, attacking e7..} dxe5 (36... Rxe5 {is not better.} 37. Nxd7 Re7 38. Nb6 Nhf6 39. Nc8 Rd7 40. e5 Ne8 41. h4 {with the strong threat 42. Bh3. Black's position is falling apart.}) 37. d6 Re6 38. Nxd7 Rxd6 39. Nxc5 Rc6 40. Nxb7 Rxc4 41. Ra1 {and the strong passer on the a-file will guarantee White's victory.}) 36... Rxd7 37. h4 Ngf6 38. Bh3 Rc7 39. Nd2 Ng4 40. Rb1 Nhf6 41. Rb6 Rd7 42. Bf1 Kf8 43. Bd3 Nh6 44. Bc2 Nf7 45. Nb1 Rc7 46. Nc3 Nd7 47. Rb1 Ke7 48. Ba4 Nd8 49. Bxd7 Kxd7 50. Kg2 Nf7 51. g4 (51. Nb5 {! This move drives Black's rook c7 to c8 in order to prepare a knight fork on c8 and f7, if necessary.} Rc8 52. Rf1 Rf8 {forced. But now White's rook will invade.} (52... Ke7 {? This would be a blunder, because Black will lose a piece!} 53. Rxf7+ Kxf7 54. Nxd6+ {winning rook c8 and the game. Now we know the reason for 51. Nb5!}) 53. Rf6 Ke7 54. Rxg6 {winning a pawn and preparing g4.} Ra8 55. Re6+ Kd7 56. g4 Rxa5 57. gxh5 Ra1 58. Rg6 Ke7 59. h6 Ra2+ 60. Kg3 Ra8 61. Kg4 Rh8 62. Re6+ Kf8 63. Kh5 Nd8 64. Rxd6 {with strong attack. Black can resign.}) 51... hxg4 52. Kg3 Nh6 53. Rb6 Ke7 54. Nd1 Ng8 55. Kxg4 Nf6+ 56. Kf3 Rd7 57. Nc3 (57. Nf2 {was better. In the game White could win because Black recklessly ventured to march his king in enemy territory. I wondered, whether White had a way to force the win in the end. Here there is the way to go, Black has no blockade position:} Kf7 58. Ng4 Ne8 (58... Nxg4 {Black must not exchange knights, because then he cannot prevent the white kiing from invading.} 59. Kxg4 Kf6 60. Rb1 Rf7 61. Rb2 {putting Black into Zugzwang! Black's king must cover g5 and his rook must protect b7 and the f-file, and Black's pawns are not ready to move either.} Rh7 62. Rf2+ Kg7 63. Rf1 {Again Zugzwang for Black!} Rh8 64. Rb1 {and White will win.}) 59. Ke3 Kg7 60. Rb1 Re7 61. Rg1 Kh7 62. Rh1 Rf7 63. h5 Rf4 64. hxg6+ Kxg6 65. Rg1 Kh5 66. Nf2 Rf7 67. Nh1 Kh6 68. Ke2 Rf8 69. Ng3 Ng7 {forced! White is threatening 74. Nf5+ and Rh6, so Black must prevent it.} 70. Ke3 Rf7 71. Ke2 Kh7 72. Rh1+ {Black cannot hinder the white rook to invade.} Kg6 73. Rh8 b6 {Other moves are not better, because White is threatening 74. Rd8 as well.} 74. axb6 Rb7 75. Kf3 Rxb6 76. Kg4 Ra6 77. Nf5 Nxf5 78. exf5+ Kg7 79. Rd8 Kf6 80. Re8 Kf7 81. Re6 Ra1 82. Rxd6 Rg1+ 83. Kf3 Rf1+ 84. Ke4 Re1+ 85. Kd3 e4+ 86. Kd2 Rf1 87. Re6 Rxf5 88. Rxe4 Rf6 89. Rh4 Ke7 90. Ke3 Rf1 91. Rh7+ Kd6 92. Rh6+ Kd7 93. Rc6 Rd1 94. Rxc5 {and White can win in 28 moves.}) 57... Kf8 58. Nb5 Ke7 59. Nc3 Kf8 60. Rb1 Kg7 61. Ke2 Kh6 62. Rf1 Nh7 63. Nb5 Kh5 64. Ke3 Kg4 65. Kd3 Kh3 66. Rg1 Nf8 67. Ke3 Kh2 68. Rf1 Nh7 69. Rf3 Kg2 70. Nc3 g5 71. hxg5 Nxg5 72. Rf5 1-0 <DC>2773

Jul-13-13		whiteshark: If you slide a few moves forward after <72...Nh7> you most likely get ( via <73.Rh5 Rg7 74.Ke2 Ng5 75.Rh6> ) click for larger view and the ♙d6 is going to fall within further 5 moves.

Jul-14-13		thomastonk: <whiteshark> Yes, that seems to be a way, and thanks for clarification. Sliding these moves forward is no big deal for me using the engine, because evertime the second best option is much worse. Houdini apparently has problems to see some silent king moves in advance. Once executed, it agrees (and doesn't forget them anymore). But the win was not called into question, only its difficulty, say, user shivasuri4 on one side and the German Chessbase report on the other. Won, but not simply won, I would say.

Jul-14-13		shivasuri4: <thomastonk>, I used 'simply' only to emphasise the won nature of the position rather than it being won on time, not to highlight its purported ease. Thanks to both you and <whiteshark> for the analysis.

Jul-14-13		thomastonk: <shivasuri4> No problem. I understand this perfectly well, and I've said something like this in similar cases many times, I am sure.

Mar-06-18		choumicha: Analyzed under the title "Positional Chess Understanding: The Space Advantage" by WGM Raluca Sgîrcea and IM Renier Castellanos on https://thechessworld.com/articles/...

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