Vasilios Kotronias vs Vasyl Ivanchuk (2011)

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Kibitzing

Vasilios Kotronias vs Vasyl Ivanchuk
Gibraltar Masters (2011), La Caleta GIB, rd 5, Jan-29
Sicilian Defense: Dragon Variation. Yugoslav Attack (B78) · 0-1

White to move.

ANALYSIS [x]

0-1

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

FEN COPIED

Given 24 times; par: 38 [what's this?]

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< Earlier Kibitzing · PAGE 2 OF 2 · Later Kibitzing>
Jan-05-19		The Kings Domain: The puzzle's a tough one for sure. Good game, nice attack by Ivanchuk.

Jan-05-19		OrangeTulip: First move was not so hard to find, just the most forcing move.

Jan-05-19		malt: Come up with 32...Rca5 33.N:a5 R:a5 34.Rh2 Qa2+ 35.Kc1 Qa1+ 36.Kd2 Q:b2 37.Rc1

Jan-05-19		Walter Glattke: 33.Rd2

Jan-05-19		goodevans: <31...Rca5> isn't hard to spot but as far as I can see it only yielded a win because white panicked with <32.Re3?>. If white instead takes with <32.Nxa5 Rxa5> then black has a couple of threats, neither of which look that potent: <33...Qa2+ 34.Kc1 Qa1+ 35.Kd2 Qxb2> would let white in with <36.Qe6> whilst <33...b3 34.cxb3 Qd3+ 35.Rc2> seems no better than a draw. White probably has other alternatives at move 32 to keep the game alive, just not the dreadful <32.Re3?>.

Jan-05-19		schachfuchs: The engine gives 31....Rca5 too, but the continuation 32.Rd1 Ra4 33.Qh3 Ra2 34.Rg2 Ra1+ 35.Nxa1 Qa2+ 36.Kc1 Qxa1+ 37.Kd2 Qxb2 38.Qc8 Ra3 39.Qc7+ +1.01 (27 ply) is far from being clear, let alone winning for Black? However, I have to admit that I also don't understand the subtle maneuver Rca5 - Ra4 - Ra2 - Ra1+...

Jan-05-19		mel gibson: I didn't see that but then again Stockfish 10 is calling it a draw: 31... Rca5 (31. .. Rca5 (♖c5-a5 ♖e1-d1 ♖a5-a4 ♖f2-h2 ♖a4-a2 ♕f5-h3 ♖a2-a1+ ♘b3xa1 ♕c4-a2+ ♔b1-c1 ♕a2xa1+ ♔c1-d2 ♕a1xb2 ♕h3-c8 ♖a6-a3 ♕c8-c4 ♕b2-c3+ ♕c4xc3 ♖a3xc3 ♖h2-f2 a7-a5 ♔d2-c1 b4-b3 ♔c1-b2 b3xc2 ♖d1-c1 ♖c3-e3 ♔b2xc2 d6-d5 ♔c2-d2 ♖e3-a3 ♖c1-c7+ ♔g7xg6 ♖f2-g2+ ♔g6-h6 e4xd5 ♖a3-a2+ ♖c7-c2 ♖a2xc2+ ♔d2xc2 ♘f6xd5 ♖g2-e2 ♘d5-b4+ ♔c2-c3 ♔h6-g5 ♖e2xe5+ ♔g5-f4 ♖e5xa5 ♘b4-c6 ♖a5xh5 ♔f4xf3 ♖h5-h6 ♘c6-e5 ♔c3-d4 ♘e5-g4 ♖h6-h7 ♔f3-f4 ♖h7-f7+ ♔f4-g5) -0.26/38 ) score for Black -0.26 depth 38 The win by Black is based on a blunder by White 32. Re3 instead of 32 Re1-d1 32.Re3 (32. .. Qd4 (♕c4-d4 ♖e3-d3 ♕d4xf2 ♖d3-d1 ♕f2-e2 ♖d1-c1 ♕e2-c4 ♖c1-e1 ♖a5-a2 ♕f5-g5 ♖a2-a1+ ♘b3xa1 ♕c4-a2+ ♔b1-c1 ♕a2xa1+ ♔c1-d2 ♕a1xb2 ♕g5-e3 ♖a6-a3 ♔d2-d1 ♖a3xe3 ♖e1xe3 ♕b2-b1+ ♔d1-d2 ♕b1-a1 ♖e3-d3 ♕a1-g1 ♖d3-b3 ♕g1-f1 ♖b3-d3 ♔g7xg6 ♖d3-b3 a7-a5 ♖b3-d3 a5-a4 ♖d3xd6 ♕f1xf3 ♔d2-c1 ♕f3-e3+ ♔c1-d1 ♕e3-c5 ♖d6-a6 ♕c5-g1+ ♔d1-e2 ♕g1-g2+ ♔e2-d1 ♕g2-f1+ ♔d1-d2 ♕f1xa6 ♔d2-e3 ♕a6-c6 ♔e3-d2) +24.49/40 ) score for Black +24.49 depth 40.

Jan-05-19		catlover: Thanks for the additional puzzle, <Penguincw>.

Jan-05-19		thegoodanarchist: <goodevans: <31...Rca5> isn't hard to spot but as far as I can see it only yielded a win because white panicked with <32.Re3?>. If white instead takes with <32.Nxa5 Rxa5> then black has a couple of threats, neither of which look that potent:> I agree with you.

Jan-05-19		Socrates2: Good game.

Jan-05-19		Marmot PFL: Nice comeback win!

Jan-05-19		agb2002: White threatens Nxc5. The semiopen a-file suggests 31... Rca5: A) 32.Nxa5 Rxa5 A.1) 33.Kc1 Qd4 wins decisive material due to Ra1#. A.2) 33.b3 Qc3 and mate in two. A.3) 33.Rff1 Qa2+ 34.Kc1 Qa1+ 35.Kd2 Qxb2 A.3.a) 36.Qe6 Qc3+ 37.Kd1 (37.Kc1 Ra1#; 37.Ke2 Qxc2+ 38.Ke3 Ra3+ 39.Qb3 Rxb3#) 37... Ra1+ 38.Ke2 Qxc2+ and mate in three. A.3.b) 36.Rc1 Qc3+ 37.Kd1 (37.Ke2 b3 looks winning -38.cxb3 Ra2+ and mate in two-) 37... b3 38.cxb3 Qd3+ 39.Ke1 Ra2 wins. A.4) 33.Ref1 Qa6 34.Kc1 (34.b3 Ra1+ 35.Kb2 Qa2(3)#; 34.c3 b3 35.Kc1 Qd3 wins) 34... Ra1+ 35.Kd2 Rxf1 wins decisive material. A.5) 33.Rg(h)1 Qa2+ 34.Kc1 Qa1+ 35.Kd2 Qxg1, etc. A.6) 33.Rg2 Qa2+ 31.Kc1 Qa1+ 35.Kd2 Qxb2 looks similar to A.3. A.7) 33.Ree2 Qa6 34.Kc1 (else as above) 34... Ra1+ 35.Kd2 b3 with attack. B) 32.Kc1 Ra2 with the threat Rxb2, taking advantage of the defenseless rook on e1, looks good for Black.

Jan-05-19		agb2002: <Walter Glattke: 33.Rd2> 33... Qxd2 -+.

Jan-05-19		cormier: click for larger view Analysis by Houdini 4 28.Qh6+ Kf7 29.g5 Qd8 30.gxf6 Qxf6 31.Qh7+ Qg7 32.Rxd6 Qxh7 33.Rxh7+ Kg8 34.Rhd7 Ra4 35.Rxg6+ Kf8 36.Re6 Re8 37.Rf6+ Kg8 38.Rg6+ Kf8 39.Rgg7 Re6 40.Nc5 Ra1+ 41.Kd2 Rd6+ 42.Nd3 Rxd7 43.Rxd7 e4 44.fxe4 Ke8 45.Nc5 Ra5 46.Rc7 Ra2 47.Kd3 a5 48.b3 + - (6.07) Depth: 19 dpa 28.Qh6+ Kg8 29.Qxg6+ Qg7 30.Qf5 Rf8 31.Rdh2 Nh7 32.Qe6+ Qf7 33.Qxd6 Qf6 34.Qd3 e4 35.Qc4+ Qf7 36.Qxe4 Qf4+ 37.Kb1 Qxe4 38.fxe4 Ra6 39.Rxh7 Rf1+ 40.Rxf1 Kxh7 41.e5 Re6 42.Rf5 Rg6 43.Rf7+ Kg8 44.Rxa7 Rxg4 45.e6 Re4 46.Ra8+ Kg7 47.Nc5 Re3 48.Ka2 Kf6 49.Rb8 Ke7 50.Rxb4 Kd6 51.Rc4 Kd5 52.b3 Kd6 53.b4 Ke7 54.b5 + - (7.72) Depth: 21 dpa 28.Qh6+ Kf7 29.g5 Ng8 30.Qh7+ Kf8 31.Qxg6 Qf7 32.Qxd6+ Qe7 33.Rh7 Qxd6 34.Rxd6 Ra4 35.Kb1 Ne7 36.Nc5 b3 37.Nxa4 bxc2+ 38.Kc1 Nf5 39.Rdd7 Kg8 40.g6 Nd4 41.Rhg7+ Kh8 42.Rc7 Rxc7 43.Rxc7 a5 44.Nc5 Ne2+ 45.Kxc2 Nf4 46.g7+ Kh7 47.Ra7 Kg8 48.Nd3 Nh5 49.Nxe5 a4 50.Kc3 Nxg7 51.Rxa4 Kf8 52.b4 Ke7 53.b5 Kd6 54.Nc4+ Kc5 55.b6 + - (10.78) Depth: 23 dpa <28.Qh6+> Kg8 29.Qxg6+ Qg7 30.Qf5 Rf8 31.Rdh2 Nh7 32.Qe6+ Qf7 33.Qxd6 Qf6 34.Qd5+ Qf7 35.Qd3 e4 36.fxe4 Qf3 37.Qd5+ Qf7 38.Rxh7 Qxd5 39.exd5 Ra6 40.Rh8+ Kg7 41.R1h7+ Kg6 42.Rxf8 Kxh7 43.Nc5 Rd6 44.Rf5 Kg6 45.Ne4 Rd8 46.d6 Rd7 47.Rb5 a5 48.Rxa5 Kf7 49.Kd2 Rd8 50.Ra6 Ke6 51.Rb6 Rh8 52.Rxb4 Ke5 53.d7 Ke6 54.Rb7 Rd8 55.Nc5+ Ke7 56.Ke3 Rf8 57.Rb6 <+ - (10.88) Depth: 24 dpa>

Jan-05-19		outplayer: It is really very difficult; I have thought about 31...Rca5 but could not find a good reply to 32.Nxa5.

Jan-05-19		RandomVisitor: 32.Rd1 is better for white, but might need a deeper run click for larger view Stockfish_19010415_x64_modern: <+0.22/41 32...Ra4> 33.Rg2 Ra2 34.Rh2 Ra1+ 35.Nxa1 Qa2+ 36.Kc1 Qxa1+ 37.Kd2 Qxb2 38.Ke1 Qc3+ 39.Rhd2 Ra3 40.Kf2 d5 41.Kg2 Ra1 42.exd5 Rxd1 43.Rxd1 e4 44.Rf1 Qxc2+ 45.Kh1 b3 46.fxe4 Qxe4+ 47.Qxe4 Nxe4 48.Rb1 Nc5 49.d6 Kxg6 50.Rxb3 Kf6 51.Rc3 Nb7 52.d7 Ke7 53.Rc7 Nd8 54.Kh2 Ne6 55.Rb7 Nc5 56.d8B+ Kxd8 57.Rb5 Ne4 58.Re5 Nf6 +0.65/41 32...Ra2 33.Qh3 R2a4 34.Rd3 Ra2 35.Rh2 Qc5 36.Qg2 Qc4 37.Qg5 Qg8 38.Kc1 Qc4 39.Qe3 Qc7 40.Rg2 Nd7 41.Qg5 Nf6 42.Rg1 Qc4 43.Rgd1 Rc6 44.Qg2 Qe6 45.Kb1 Raa6 46.Rg1 Rc8 47.Qd2 Qc4 48.Rc1 Rcc6 49.Qg5 Rc8 50.Rd2 Qc6 51.Rcd1 Qd7 52.Qe3 Qc6 53.Rg1 Qa4 54.Rdg2 Rc7 55.Kc1 Qa2 56.Rh2 Rac6

Jan-05-19		cormier: click for larger view Analysis by Houdini 4 d 24 dpa done <1. + / - (0.80): 27...Rc6> 28.Rhh2 Kf7 29.Kb1 Rg8 30.Rd1 Rc4 31.Qe3 g5 32.Nd2 Rd4 33.Re1 Qc5 34.Qg1 Qc7 35.Ne4 Nxe4 36.fxe4 Ke8 37.Qf1 Qb7 38.Rh6 Qd7 39.Qh3 Qf7 40.Rh1 Kd7 41.Qe3 Kd8 42.Qe2 Qc4 43.Rxd6+ Kc8 44.Qxc4+ Rxc4 45.Ra6 Rg7 <2. + / - (0.84): 27...Qc4> 28.Kb1 Kf7 29.Rdh2 Rg8 30.Rh6 Rb6 31.Qd2 g5 32.Nc1 Ra6 33.b3 Qd4 34.Qxd4 exd4 35.Rd1 Kg7 36.Rhh1 Re8 37.Rxd4 Rb6 38.Nd3 a5 39.Re1 Rxe1+ 40.Nxe1 Kg6 41.Kb2 Rc6 42.Nd3 Nd7 43.Rd5

Jan-05-19		cormier: click for larger view Analysis by Houdini 4 d 21 dpa done <1. + - (1.89): 27.f4> exf4 28.Qxf4 Rxa5 29.Rf2 Qe7 30.Qh6+ Kf7 31.Qh7+ Ke6 32.Qxg6 Kd7 33.Rxf6 Kc6 34.Rd1 Rd8 35.Qh6 b3 36.cxb3 Kb7 37.Qh1+ Kb8 38.Qf3 Qb7 39.a4 Qxf3 40.Rxf3 Rg5 41.Rd4 Rdg8 42.Rff4 Kc7 43.Kc2 d5 44.Kd3 Kd6 45.a5 Ke6 46.b4 2. + / = (0.66): 27.Nb3 Qc4 28.Kb1 Kf7 29.Qh6 Rg8 30.Qe3 Rc8 31.Rh6 Rg8 32.Nc1 Rg7 33.g5 Nd5 34.Qe1 Kg8 35.Rdh2 Kf7 36.Rh8 Ke7 37.Nb3 Rf7 38.Rb8 Rb6 3. + / = (0.55): 27.Qh6+ Kf7 28.Nb3 Rc6 29.Rhh2 Rc4 30.Kb1 Rg8 31.g5 Ne8 32.Qh3 Rf4 33.Qf1 Qc6 34.Rh3 Rf5 35.Qg1 Qc7 36.Rh7+ Rg7 37.Rh4 Qb6 38.Qxb6 axb6 39.Rxb4 Rxf3 40.Rxb6 Rf1+ 41.Nc1 e4 42.a4 Ke6 43.Re2

Jan-05-19		RandomVisitor: After 31...Rca5, 1.5 hours computer time, Stockfish thinks black has no advantage click for larger view Stockfish_19010415_x64_modern: <0.00/57 32.Rd1> Ra2 33.Rh2 Ra1+ 34.Nxa1 Qa2+ 35.Kc1 Qxa1+ 36.Kd2 Qxb2 37.Ke1 Qc3+ 38.Rhd2 Ra3 39.Kf2 d5 40.Kg2 Ra1 41.exd5 Rxd1 42.Rxd1 e4 43.Kh3 Qxc2 44.Rf1 Qd3 45.Rf2 Qe3 46.Rf1

Jan-05-19		cormier: click for larger view Analysis by Houdini 4 <d 20 dpa 1. = (0.25): 25...Qf7> 26.hxg6 Qxg6 27.Qh4 h6 28.Kb1 Ra6 29.Nb3 Rac6 30.Rhh2 Qg5 31.Qf2 R8c7 32.Rh1 Qf4 33.Ka1 d5 34.Re1 d4 35.Qe2 Nd7 36.Qd3 Rf6 37.Rf2 Nc5 38.Nxc5 Rxc5 2. + / - (1.30): 25...Rb5 26.hxg6 hxg6 27.Qh6+ Kf7 28.g5 Rc5 29.gxf6 Rxc2+ 30.Kd1 Rxd2+ 31.Kxd2 Qc2+ 32.Ke3 Qc5+ 33.Ke2 Qc2+ 34.Qd2 Kxf6 35.Nb3 d5 36.Rc1 Qxd2+ 37.Kxd2 Rxc1 38.Nxc1 Kf5 39.Nd3 b3 40.axb3 e4 41.fxe4+ dxe4 42.Nc5 Kf4 43.Ke2 g5 44.Ne6+ Kf5 45.Nd4+ Kf4 46.Kf2 e3+ 47.Ke2 g4 48.Nc2 g3 49.Nxe3 a5 50.Ng2+ Ke4 51.Kf1 Kf3

Jan-05-19		cormier: click for larger view Analysis by Houdini 4 <d 23 dpa done 1. + / = (0.58): 25.Rh2> Qf7 26.hxg6 Qxg6 27.Qd2 Rb5 28.Nb3 Rd5 29.Qxb4 Rxd1+ 30.Kxd1 Rc7 31.Kc1 Qd3 32.Rf2 h6 33.Kb1 Nd5 34.Qd2 Qe3 35.c3 Qb6 36.Rh2 Ne3 37.Rh1 d5 38.Ka1 Rf7 39.Qh2 Qf6 2. + / = (0.47): 25.Rd2 Qf7 26.b3 h6 27.Qe3 Rc3 28.hxg6 Qxg6 29.Qe2 d5 30.Qxe5 Qg5 31.f4 Qxe5 32.fxe5 Nxg4 33.Rxd5 Ne3 34.Rd7+ Kf8 35.Nc4 Nxc4 36.bxc4 Rxc4 37.Rxa7 Rbc6 38.Rh2 Re4 39.Rb7 Rxe5 40.Rf2+ Ke8 41.Rg2 Rg5 42.Re2+ Kf8 43.Rxb4 Kf7 44.a4 h5 45.Kb2 Rg4 3. = (-0.10): 25.Qd2 Rb5 26.Nb3 Rd5 27.Qh2 g5 28.h6+ Kf7 29.Kb1 a5 30.Rxd5 Nxd5 31.Qe2 Qc4 32.Qd2 a4 33.Na5 Qd4 34.Qxd4 exd4 35.Rd1 Ne3 36.Rxd4 Rxc2 37.Re4 Re2 38.Kc1 d5 39.Rxb4 Rc2+ 40.Kb1 Rf2 41.Rb7+ Kf6 42.Kc1 Rxf3 43.Rxh7 Kg6 44.Rd7 Nxg4 45.Rxd5 Kxh6 46.Rd4 Rf4 47.Nc6 Rxd4 48.Nxd4 Ne5 49.Kd2 g4

Jan-05-19		patzer2: White's decisive error was 32. Re3??, allowing 32...Qd4 -+ (mate-in-27, Stockfish 10 @ 51 ply). Instead, 32. Rd1 ⩲ (+0.59 @ 42 ply, Stockfish 10) or 32. Nxa5 Rxa5 33. Rg2 = (0.00 @ 37 ply, Stockfish 10) would have held for White. Even so, the 31...Rca5! = to ⩲ solution to today's Saturday puzzle is better than the next best alternative 31...Rc8 32. Rh2 ± (+0.92 @ 38 ply, Stockfish 10).

Jan-05-19		al wazir: Penguincw: I decided to present what is probably an easier puzzle.> Nice! Here is the final move: 8. Ra3#.

Jan-05-19		cormier: click for larger view Analysis by Houdini 4 <d 25 dpa done 1. + / = (0.66): 20.Nc5> Qe7 21.Nxe6 fxe6 22.h5 gxh5 23.gxh5 Rc6 24.h6 Qf7 25.Rhg1 Ne8 26.Rg4 Qf6 27.Qxf6+ Nxf6 28.Rg7 Ng8 29.Rxa7 Rxf3 30.Ra8 Rg3 31.Re1 Rg6 32.Rb8 Rc7 33.Rxb4 Nxh6 34.a4 Kg7 35.a5 Ng4 36.a6 Nxe3 37.Rxe3 Rg2 2. + / = (0.38): 20.Kb1 Qe7 21.h5 Nd5 22.Qxe7 Nxe7 23.Rd3 Rc8 24.hxg6 fxg6 25.Nd2 Rbc6 26.b3 R8c7 27.Ndc4 Nc8 28.a3 bxa3 29.Nxa3 Kg7 30.Nec4 h6 31.Rh2 Rf7 32.Kb2 Rf8 33.Rh1 Bg8 34.Rhd1 Rc5 35.Rc3 a6

Jan-05-19		cormier: click for larger view Analysis by Houdini 4 d 24 dpa done 1. + / = (0.35): 17...Bb5 18.Rhg1 Kh8 19.Qh4 Re8 20.Rg3 Rc8 21.Rh3 Bc4 22.Nxc4 Rxc4 23.Na5 Rc7 24.b3 Re6 25.Nc4 Kg8 26.Kb1 Qc8 27.Qh6 Rxc4 28.bxc4 Qxc4 29.Qe3 a5 30.Rh6 Qc6 31.g5 Nh5 2. + / = (0.42): 17...Be6 18.h4 Kh8 19.Qg5 Kg7 20.Nf5+ Bxf5 21.exf5 h6 22.Qe3 gxf5 23.Rhg1 f4 24.Qd3 Rg8 25.Qxd6 Qxd6 26.Rxd6 Rb6 27.Rxb6 axb6 28.Re1 Re8 29.Nd2 Nd5 30.Nc4 f6 31.Rd1 Ne3 32.Nxe3 fxe3 33.Re1 Ra8 34.Rxe3 Rxa2 35.Re4 Ra1+ 36.Kd2 b3 37.cxb3 Rf1 38.Ke3 Re1+ 39.Kd3 Rf1 40.Ke2

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