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Anna Muzychuk vs Tan Zhongyi
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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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Aug-25-18  cormier:


click for larger view

Analysis by Houdini 4: d 24 dpa done

1. = (0.10): 11...Rd8 12.Kb1 Rb8 13.Bxc5 Nxc5 14.Qe3 Qb6 15.Nd4 Ne4 16.Be2 Nxc3+ 17.Qxc3 Bd7 18.Qb3 Qc5 19.c3 Rdc8 20.Rhf1 a6 21.Qc2 Nxd4 22.Rxd4 Bb5 23.Bd3 h6 24.Rd1 Bxd3 25.Qxd3 Qc7 26.g4 b5

2. = (0.10): 11...a6 12.Kb1 Bxe3 13.Qxe3 b5 14.Nd4 Qb6 15.h4 Nxd4 16.Qxd4 Bb7 17.Qxb6 Nxb6 18.Ne2 Rac8 19.Nd4 Na4 20.Be2 Nc5 21.Bg4 Rce8 22.Rhf1 g6 23.h5 Ne4 24.h6 Rd8

3. = (0.14): 11...Qb6 12.Nd4 Nxd4 13.Bxd4 Bxd4 14.Qxd4 Qxd4 15.Rxd4 a6 16.Be2 b6 17.Rhd1 Ra7 18.Kb1 Rc7 19.Rb4 Bb7 20.h4 Rfc8 21.Ka2 Rc6 22.Rbd4 h6 23.g3 Nc5 24.f5 b5

4. = (0.22): 11...Rb8 12.Bxc5 Nxc5 13.Qe3 Bd7 14.Bb5 Qb6 15.Rhe1 Ne7 16.Bxd7 Nxd7 17.Qxb6 Nxb6 18.b3 a6 19.Kb2 Nd7 20.Nd4 Rbc8 21.g4 Rfe8 22.Nce2 h6 23.h4 g5 24.hxg5 hxg5 25.Nf3 gxf4 26.Nxf4 Rc7 27.Nd3 Rec8 28.Rd2 Nc5

<5. = (0.24): 11...Be7 possibly not the best move?> 12.Nd4 a6 13.h4 Qc7 14.h5 Rb8 15.Rh3 b5 16.Rg3 b4 17.axb4 Rxb4 18.Nxc6 Qxc6 19.Kb1 h6 20.Bd4 Bc5 21.Bxc5 Qxc5 22.Na2 Ra4 23.Rb3 Qc7 24.Nc3 Ra5 25.g4 Nc5 26.Rb4 Bd7 27.Be2 Rc8

6. = (0.25): 11...Bxe3 12.Qxe3 a6 13.Bd3 Rd8 14.Ne2 Qc5 15.Qd2 Rb8 16.Ned4 h6 17.Kb1 b5 18.Nxc6 Qxc6 19.Nd4 Qc7 20.Rhe1 Nc5 21.Qc3 Qb6 22.Qb4

7. + / = (0.29): 11...Qc7 12.Kb1 a6 13.Qd3 h6 14.g4 Rd8 15.Bxc5 Nxc5 16.Qe2 Ne7 17.Rg1 Bd7 18.Nd4 Rac8 19.f5 Ne4 20.Nxe4 dxe4 21.fxe6 Bxe6 22.Bg2 Qxe5 23.Qxe4 Qxe4 24.Bxe4 Nd5 25.g5 h5 26.c3 Bg4

8. + / = (0.31): 11...h6 12.Kb1 Rd8 13.Be2 Qb6 14.Nd4 Nxd4 15.Bxd4 Bxd4 16.Qxd4 Qxd4 17.Rxd4 a6 18.h4 Nb8 19.Rd2 Bd7 20.Rdd1 Kf8 21.b3 b5 22.Bf3 Nc6 23.Ne2 Rac8 24.Kb2 Ke7 25.c3

9. + / = (0.31): 11...Re8 12.Bxc5 Nxc5 13.Nb5 Qxd2+ 14.Rxd2 Ne4 15.Nc7 Nxd2 16.Kxd2 Bd7 17.Bd3 Rac8 18.Nxe8 Bxe8 19.Ke3 Kf8 20.c3 Ke7 21.Nd4 Nxd4 22.Kxd4 a5 23.Rf1 g6 24.g4 Ba4 25.f5 Bb3 26.f6+ Kd7 27.Bb5+ Kc7

Aug-25-18  cormier:


click for larger view

Analysis by Komodo 9: d 28

.(1. + / = (0.41): 11.a3). Qb6 12.Bxc5 Nxc5 13.Kb1 Ne7 14.h4 Bd7 15.Qe1 Rac8 16.h5 h6 17.Nd4 Rfd8 18.Rh3 Na4 19.Nxa4 Bxa4 20.Qd2 Nc6 21.b3 Nxd4 22.Qxd4 Qxd4 23.Rxd4 Bd7 24.g4 Kf8 25.Kb2 Rc7 26.g5 Rdc8 27.c3 Ke7 28.gxh6

2. + / = (0.31): 11.Bxc5 Nxc5 12.Kb1 Bd7 13.Be2 Rac8 14.a3 h6 15.Rhf1 Rfd8 16.Qe3 Qb6 17.Nd4 Nxd4 18.Qxd4 Qc7 19.Rd2 b6 20.Rfd1 Bc6 21.h4 Qe7 22.g3 Rb8 23.Qe3 Rbc8 24.Rd4 a5 25.h5 Rd7 26.Bd3 Nxd3 27.Qxd3

3. = (0.09): 11.Kb1 Bb4 12.Bd3 Bxc3 13.Qxc3 Qxc3 14.bxc3 Nb6 15.Bb5 h6 16.Bc5 Rd8 17.Bxb6 axb6 18.c4 Ra5 19.a4 Na7 20.Rd4 Bd7 21.Kb2 Nc6 22.Rdd1 Na7 23.Bxd7 Rxd7 24.cxd5 Raxd5 25.Rxd5 Rxd5 26.Re1 b5 27.Ra1 Nc6 28.a5

Aug-25-18  cormier:


click for larger view

Analysis by Komodo 9: d 27 dpa done

1. + / = (0.40): 11...a6 12.Bxc5 Qxc5 13.Bd3 h6 14.g4 b5 15.g5 h5 16.Kb1 b4 17.axb4 Qxb4 18.Ne2 Nc5 19.g6 Rb8 20.Qxb4 Rxb4 21.Rhg1 f6 22.c3 Rb6 23.exf6 Rxf6 24.Rg5 Na4 25.Rd2 Nc5 26.Rxh5 Nxd3 27.Rxd3 Rxg6

2. + / = (0.42): 11...Qb6 12.Bxc5 Nxc5 13.Kb1 Ne7 14.g4 Bd7 15.Nd4 Rfd8 16.Qe3 Rac8 17.Be2 Na4 18.Nxa4 Bxa4 19.b3 Nc6 20.Rd2 Rc7 21.h4 Rdc8 22.Re1 Nxd4 23.Qxd4 Qxd4 24.Rxd4 Bd7 25.Bd3 h6 26.g5 hxg5

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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  whiteshark: Yes, I missed that line. Mange tak for ingenting.
Sep-16-18
Premium Chessgames Member
  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
Premium Chessgames Member
  whiteshark: <patzer2> Sometimes engines seem to me like hounds that have to be carried to the hunt. ;)
Sep-16-18
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
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