Anna Muzychuk vs Zhongyi Tan (2017)

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Anna Muzychuk vs Zhongyi Tan
Women's World Championship Knockout Tournament (2017), Tehran IRI, rd 6, Mar-01
French Defense: Steinitz. Boleslavsky Variation (C11) · 1-0

ANALYSIS [x]

FEN COPIED

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< Earlier Kibitzing · PAGE 4 OF 4 · Later Kibitzing>
Aug-25-18		cormier: click for larger view Analysis by Komodo 9 10...Qb6 11.Nd4 Bxd4 12.Bxd4 Qxd4 13.Qxd4 Nxd4 14.Rxd4 a6 15.a3 Nb8 16.g3 b5 17.Kb1 h6 18.Be2 Bd7 19.Rd2 Rc8 20.Rhd1 Rc7 21.h4 Bc6 22.Bd3 Nd7 23.Ne2 Rac8 24.Nd4 Bb7 25.Rg2 Nc5 26.c3 Nxd3 + / = (0.30) Depth: 30

Sep-16-18		landshark: I feel pretty good that I got A) the first move right, and B) the right idea of Qd3+ and Ng5+ (although wrong order). In my world that = good positional assessemnt - considering there were other ways to potentially conduct the attack (such as g4 etc) which I discarded as too slow. Enough for this shark on a Sunday -

Sep-16-18		Walter Glattke: 14.Bh7+, or 14.Rg1 g6 15.h5, and black can resign.The Woman, whoe plays black, is absolutely unknowing, what the white constellation Bd3/Be3 0-0-0 means. (Qd2/Be3 Bh6 g4 h5 etc.)

Sep-16-18		sjunto: Much like Landshark, I got the first three moves, but in the right order; then a quick trip to Stockfish 9 says Nxd5 is about a pawn better than my choice, the en passant capture, but both are strong. Was I supposed to get the whole 18 moves?

Sep-16-18		Walter Glattke: 17.Nxd5 is Play "nice", 17.Nxe6 Rf7 18.Qxd5 wins earlier.

Sep-16-18		Mayankk: I got the first three moves as well though I wasn’t sure which one to play first - Qd3 or Ng5. I expected a g6 defence after which a simple h5 seemed like a winnable move. I also briefly thought of routing my Queen through Qe2 to Qh5 and should Black resist via g6, then a pawn move to h5 was always handy. f5 seems a tougher defence - I didn’t visualise that.

Sep-16-18		mel gibson: I considered 14. Bxh7+ but it looked too risky. Stockfish 9 is agreeing with the first 2 moves: 14. Bxh7+ (14. Bxh7+ (♗d3xh7+ ♔g8xh7 ♘f3-g5+ ♔h7-g8 ♕d2-e2 g7-g6 h4-h5 ♗e7xg5 h5xg6 f7xg6 ♕e2-g4 ♘d7xe5 ♕g4xg5 ♕a5-c7 f4xe5 ♕c7-g7 g2-g4 ♘c6-d8 ♗e3-c5 ♘d8-f7 ♕g5-e7 ♖a8-b8 ♖d1-f1 ♗c8-b7 ♕e7xe6 d5-d4 ♗c5xf8 ♖b8xf8 ♘c3-d5 ♗b7xd5 ♕e6xd5 ♕g7xe5 ♕d5-d7 a6-a5 ♔c1-b1 ♔g8-g7 ♕d7-a7 ♔g7-g8) +5.05/33 ) score for White +5.05 depth 33

Sep-16-18		patzer2: There are at least two winning lines which transpose as the solution to today's Sunday (14. ?) puzzle. Of course the first move of the combination solving this difficult Sunday puzzle is the demolition of pawn structure sham sacrifice 14. Bxh7+!! After the expected 14...Kxh7, White has two options which transpose to the same winning position. First is the game continuation 15. Qd3+ Kg8 16. Ng5 f5 17. Nxd5! +- (+3.11 @ 31 ply, Stockfish 9). Second is 15. Ng5+ Kg8 16. Qd3 f5 17. Nxd5! +- (+3.11 @ 31 ply, Stockfish 9). While 17. Nxd5! +-, threatening 17...exd5 18. Qxd5+ Kh8 19. Qxc6 +- (or 19. Qf3! +-), is the strongest continuation, there is a strong second best alternative winning alternative. That second best winning option is 17. exf6 Nxf6 18. h5 +- (+2.60 @ 31 ply, Stockfish 9). P.S.: So where did Black go wrong? According to the computers, the decisive mistake occurred just one move earlier with 13...b5? allowing 14. Bxh7+!! Instead, 13...f6 14. exf6 Nxf6 ⩲ (+0.31 @ 31 ply, Stockfish 9) appears to hold the position with only a slight White advantage. According to our Opening Explorer, the passive retreat 11...Be7?! ⩲ to ± (potentially allowing 12. h4 ± +1.00 @ 28 ply, Stockfish 9) has not been good for Black (1 win versus 5 losses). Instead, the second player has had more success with the more popular moves 11...Rb8 = as in Black's win in S Mazur vs J S Christiansen, 2017, 11...Rd8 = as in the draw in E Inarkiev vs S Volkov, 2017 and 11...a6 = as in Black's win in Shabalov vs I Nyzhnyk, 2017.

Sep-16-18		whiteshark: The critical position comes after <16... f5> when the agony of choices begin: click for larger view White to move 1) +2.71 (31 ply) 17.Nxd5 Rf7 18.Qe2 Nf8 19.Qh5 g6 20.Nxe7+ Nxe7 21.Qf3 Rb8 22.h5 b4 23.Bd2 Qd5 24.Bxb4 Qxf3 25.gxf3 gxh5 26.Rxh5 a5 27.Bc5 Bd7 28.Rg1 Rg7 29.Bxe7 Rxe7 30.Nxe6+ Kf7 31.Nc7 Rb6 32.Nd5 Rg6 33.Rxg6 Kxg6 34.Rg5+ Kf7 35.Nxe7 Kxe7 36.Rg8 2) +2.46 (31 ply) 17.Qe2 Rd8 18.Nxe6 Nf8 19.Nxd8 Bxd8 20.Nxd5 Be6 21.Bc5 b4 22.Bxb4 Nxb4 23.Nxb4 Qa4 24.h5 a5 25.Nd5 Bxd5 26.Rxd5 Qxf4+ 27.Kb1 Qg4 28.Qd3 Be7 29.g3 Ne6 30.h6 Qe4 31.Qxe4 fxe4 32.hxg7 Nxg7 33.Re1 Nf5 3) +1.50 (30 ply) 17.Nxe6 d4 18.Nxd4 Nc5 19.Nxc6 Nxd3+ 20.Rxd3 Qc7 21.Nd5 Qb7 22.Ncxe7+ Kh7 23.h5 Be6 24.h6 g6 25.Rhd1 Rf7 26.Nf6+ Rxf6 27.exf6 b4 28.axb4 a5 29.b5 Qxb5 30.Rd6 Ra6 31.Nc8 Rxd6 32.Nxd6 Qd7 33.Ne4 Qxd1+ 34.Kxd1 fxe4 35.Ke2 Bc4+ 36.Kd2 Bd5 37.b3 Kxh6 38.f5+ Kh5 15.0 minute analysis by Stockfish 9 v010218

Sep-16-18		whiteshark: Re line <2) +2.46 (31 ply) 17.Qe2 Rd8 18.Nxe6 Nf8 19.Nxd8 Bxd8 20.Nxd5...> So what's wrong with the direct <18.Qh5>? click for larger view Can't SF9 evaluate this position properly?

Sep-16-18		whiteshark: Finally, SF gets it <17.Qe2 Rd8 18.Qh5>: click for larger view Black to move 1) +22.51 (28 ply) 18...Bxg5 19.hxg5 Ncxe5 20.fxe5 Nxe5 21.Bd4 Qc7 22.g6 Nxg6 23.Qh7+ Kf8 24.Qxg6 Ra7 25.Bf6 Qf4+ 26.Kb1 gxf6 27.Qxf6+ Ke8 28.Rh8+ Kd7 29.Qxd8+ Kc6 30.Qxc8+ Kd6 31.Rd8+ Ke5 32.Re1+ Qe4 33.Qb8+ Kf6 34.Nxe4+ dxe4 35.Qxa7 b4 36.Rf8+ Kg5 37.Qe7+ Kf4 38.Qxe6 bxa3 39.Qxe4+ Kg3 40.Rxf5 axb2 41.Kxb2 2) +24.13 (27 ply) 18...Bxg5 19.hxg5 Ncxe5 20.fxe5 Nxe5 21.Bd4 Qc7 22.g6 Nxg6 23.Qh7+ Kf8 24.Qxg6 Qf4+ 25.Kb1 Qxd4 26.Rxd4 Ke7 27.Qg5+ Kf7 28.Qxd8 Kg6 29.Qe8+ Kf6 30.Qc6 Ra7 31.Qxc8 Rf7 32.Qxa6 Kg5 33.Qxe6 Rf6 34.Qxd5 Ra6 35.Ne4+ Kg6 36.Qxb5 fxe4 37.Qxa6+ Kf5 38.Re1 Kg5 39.Qb5+ Kg6 40.Rexe4 3) mated-in-6 (27 ply) 18...Bf6 19.Qf7+ Kh8 20.Bc5 Nxc5 21.exf6 Nb3+ 22.cxb3 Qxc3+ 23.bxc3 gxf6 24.Qh7# 6.0 minute analysis by Stockfish 9 v010218 provisional conclusion: <17.Qe2> seems like the best move. [check for 17... alternatives]

Sep-16-18		BOSTER: <beatgiant>:<8...0-0 is a book line>. You are right, but sometimes it is nice to keep your plan not so obvious.

Sep-16-18		whiteshark: What's going on here? SF fails again to find the winning continuation (after 15 mins!): click for larger view Black to move 1) +1.77 (32 ply) <17...Rd8? 18.Nxe6?> d4 19.Nd5 dxe3 20.Qxe3 Bf8 21.Nxd8 Qxd8 22.e6 Rb8 23.Rhe1 Rb7 24.Qc3 Ne7 25.Qf3 Nc6 26.Qg3 Kh8 27.Qc3 Nde5 28.fxe5 Qe8 29.e7 Nxe7 30.Nf6 gxf6 31.exf6 Kh7 32.Kb1 a5 33.Qc5 a4 34.Rd6 Rb8 35.fxe7 Bxe7 36.Qe5 Rb7 2) +5.64 (32 ply) 17...Rf6 18.Qh5 Rh6 19.Qf7+ Kh8 20.Qe8+ Bf8 21.Bc5 Bb7 22.Qxd7 Bxc5 23.Qxb7 Rf8 24.Qxc6 Qb6 25.Qd7 Qa7 26.Qxa7 Bxa7 27.Ne2 Kg8 28.g3 Bf2 29.Rd3 Rc8 30.Nd4 Bxd4 31.Rxd4 a5 32.Rd3 Kf8 33.Kd2 Rc4 34.Rb3 Rc5 35.Rc3 Rc4 36.b3 Rxc3 37.Kxc3 Ke7 38.Rd1 3) +6.55 (32 ply) 17...Bxg5 18.hxg5 g6 19.Nxd5 b4 20.Qc4 bxa3 21.Qxc6 axb2+ 22.Kxb2 Rb8+ 23.Kc1 Qa3+ 24.Kd2 Qa5+ 25.Ke2 Qb5+ 26.Qxb5 axb5 27.Ne7+ Kg7 28.Nxc8 Rbxc8 29.Rxd7+ Rf7 30.Rxf7+ Kxf7 31.Kd3 Rd8+ 32.Bd4 Ke7 33.Rh7+ Kf8 34.Rb7 Ke8 35.Rxb5 Rd7 36.Rb6 Ke7 37.Kc4 Rc7+ 38.Bc5+ Ke8 39.Rxe6+ Kf7 40.Rf6+ Kg7 15.0 minute analysis by Stockfish 9 v010218

Sep-16-18		whiteshark: Yes, I missed that line. Mange tak for ingenting.

Sep-16-18		patzer2: <Whiteshark> Thanks for pointing out the not-so-apparent best move 17. Qe2! +-. Initially, my Stockfish 9 program had it at less than a two pawn advantage. But after I forced the program to look at 17. Qe2! with the idea of 18. Qh5, the evaluation rapidly begin to climb to a clearly decisive best-move result for 17. Qe2! +- (+6.02 @ 31 ply, Stockfish 9).

Sep-16-18		whiteshark: <patzer2> Sometimes engines seem to me like hounds that have to be carried to the hunt. ;)

Sep-16-18		agb2002: I haven't found the time to analyze in depth this puzzle but on the board I think I'd shoot first and ask later: 14.Bxh7+.

Sep-16-18		drollere: Bh7+ followed by the Q+ was obviously the start, although i thought the h pawn would have a bigger role to play.

Sep-16-18		Walter Glattke: 17.Qe2 Rd8 18.Qh5 Nf6 19.Qf7+ Kh8 20.exf6 Rxd1+ 22.Kxd1 Bxf6 23.Qf8# 18.-Bxg5 19.hxg5 Kf8 20.Qh8+ Ke7 21.Qxg7+ Ke8 22.Rh8+ Nf8 23.Rxf8# / 20.-Kf7 21.g6+ Kxg6 22.Qh5# Beware of this stockfish analysis

Sep-16-18		whiteshark: <Walter Glattke: 17.Qe2 Rd8 18.Qh5 Nf6 19.Qf7+ Kh8 20.exf6 Rxd1+ 22.Kxd1 Bxf6 23.Qf8#> 20...Rxd1+ is no legal move. 20...Bxf6 is #4, though.

Sep-16-18		sjunto: After 38 ply, ( I fell asleep,) Stockfish rates 17. Nxd5 4.02, 17. ef 2.92; and the winner, 17. Qe2 6.40!

Jun-30-19		BxChess: Now Anna won

May-31-25		thegoodanarchist: After the 2nd sacrifice I found myself wondering, How much wood would Muzychuk chuck?

May-31-25		saffuna: <thegoodanarchist: After the 2nd sacrifice I found myself wondering, How much wood would Muzychuk chuck?> Excellent!

May-31-25		perfidious: Very good indeed.

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