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Alexander Morozevich vs Yifan Hou
Biel (2017), Biel SUI, rd 1, Jul-24
Formation: King's Indian Attack (A07)  ·  0-1


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Kibitzer's Corner
Jul-24-17  actinia: a rusty Moro gifts Yifan Hou with a dubious piece sacrifice... the knight on f8 does an excellent job of guarding black's weak light squares
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  Sokrates: True, and Yifan Hou proved herself as a skilled defender. The rook on c6 was also a great defensive ressource all the way. 31.- ♘h4 was a clever move, grabbing the initiative.
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  technical draw: White tries to get some play with 37.Rc1 thinking black will move the bishop. But Hou surprises with 37..R(d)d6. Game over.
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  patzer2: Instead of the piece sacrifice 17. Nxd5!? = to , Stockfish 8 prefers the quiet positional move 17. d5 =. Even so, the problem doesn't appear to be so much with White's aggressive move choice. Rather it's with the follow-up.

Instead of the immediate 20. h6?! , Stockfish 8 indicates White should have sharpened up the position with the poisoned pawn offer 20. d4! Kg8 = (not 20...cxd5? 21. Qxb5 ) 21. dxc5 Bxc5 22. Qxb5 = (0.00 @ 33 depth, Stockfish 8).

P.S.: Here's the Stockfish 8 analysis of the top three options for White's 17th move:

( [Stockfish 8 64] 32:+0.00 17.d4 cxd4 18.cxd4 h6 19.Nxd5 exd5 20.e6 fxe6 21.Qxe6+ Kh8 22.Qf7 Ra7 23.Rac1 Bf6 24.Bh3 Ba8 25.Re6 Nb6 26.Qg6 Ne7 27.Qf7 Nc6 )

( [Stockfish 8 64] 32:-0.24 17.Nxd5 exd5 18.e6 Nf8 19.exf7+ Kxf7 20.d4 c4 21.h6 Kg8 22.hxg7 Kxg7 23.Qd2 a3 24.Bh6+ Kg8 25.Rab1 b4 26.Qf4 Qd6 27.Ng5 Nd8 28.Qf5 Bxg5 29.Bxg5 Qg6 30.Qxg6+ hxg6 31.bxa3 Rxa3 32.Be7 Rxc3 33.Bxb4 Rd3 34.Re8 Ne6 35.Rxc8 Bxc8 36.Bxd5 )

( [Stockfish 8 64] 31:-0.28 17.Rac1 h6 18.d4 cxd4 19.cxd4 Nb6 20.Ng4 Qf8 21.Qxb5 Bd8 22.Qd3 Nc4 23.Qb1 Ba6 24.Bf1 Rab8 25.Qa1 Ba5 26.Red1 Rb6 27.Bxh6 gxh6 28.Nf6+ Kh8 29.Nd7 Qd8 30.Nxb6 Qxb6 31.Rc2 Nb4 32.Rxc4 dxc4 33.Qc1 Nd5 34.Qxh6+ Kg8 35.Qc1 a3 36.Qg5+ Kh7 37.bxa3 )

Jul-27-17  beenthere240: I love the calm efficient defense.
Jul-28-17  ChessEscudero: What's the 36. c6 for?
Aug-02-17  Zeno of Citium: I just let SF8 run up to a depth of 34, and both it and Komodo 11 prefer Moro's 17. Nxd5 move on my computer, both seeing it as dead even.

Then Hou slowly out played Moro for a significant but modest advantage until Moro's 26. Qf3 when things really started to go South for him.

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