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Anatoly Vaisser vs Ivan Sokolov
San Bernardino op (1989), San Bernardino SUI, rd 8, Sep-??
Gruenfeld Defense: Exchange. Modern Exchange Variation (D85)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jul-23-20
Premium Chessgames Member
  NM JRousselle: I often tell students to look for combinations based upon unprotected pieces. This puzzle is a good example of that.
Jul-23-20  Dezaxa: Black overlooked 22... Qc7! winning. 23 Rh8 Bh8 24 Qh4 Nd3 25 Bd3 Qc1 26 Ke2 Qh1. Black also missed 30... Bf3 leading to mate.
Jul-23-20  Cheapo by the Dozen: I was thinking 40 ... Qf4+. That works too. In fact, the engine prefers it to the game move.
Jul-23-20  Walter Glattke: White threatens Qc7+: 37.-Bg5+? 38.f4 Be4 39.Qc7+ Kd5 40.Rd7# 37.-Bxd4+ 38.Kd2 Qa5+ 39.Ke1 Bf3+ wins 38.Kxd4 Qa4+ wins the rook, decisive material: 39.Ke3 Qe4+/39.Kd3 Qe4+/39.Kc3 Qc4+ 40.Kb2? Qb3+ 41.Ka1 Qa2# 40.Kd2 also Qf4+ 41.Ke1 Bf3+ 42.Kc2 Be4+ 43.Kb2 Qxc1+ 44.Kxc1 Bxh7 works better after queen's changing, every pupil could defeat a grandmaster then.
Jul-23-20
Premium Chessgames Member
  agb2002: Black has the bishop pair for a rook.

White threatens Qc7#.

37... Bg5+ is met with 38.f4 but 37... Bxd4+ takes advantage of the defenseless rook:

A) 38.Kxd4 Qa4+

A.1) 39.Kc3 Qc4+ 40.Kd2 (40.Kb2 Qb3+ 41.Ka1 Qa2#) 40... Qf4+ 41.Kc2 (41.Kd1 Bb3+ wins) 41... Be4+ 42.Kb2 Qxc1+ 43.Kxc1 Bxh7 - + [b+p].

A.2) 39.Kd(e)3 Qe4+ and 40... Qxh7 - + [b+p].

B) 38.Kd2 Bc5 - + [b+p].

C) 38.Kf4 Bc5 - + [b+p].

Jul-23-20  JoeYeomans: Doesn't ..?37Bg5+ win immediately?
Jul-23-20  Brenin: Earlier, Black missed a mating attack, starting with 30 ... Bf3+, e.g. 31 Kxc1 Qe1+, or 31 Kc2 Qa4+, or 31 Be2 Bxe2+, etc., with the White K's supporting pieces all out on the rim, unable to defend him.
Jul-23-20  bachiller: JoeYeomans: 38. f4
Jul-23-20  mel gibson: The idea is to take the Rook by forking the King and Rook.

Stockfish 11 says:

37... Bxd4+
(37. .. Bxd4+ (♗f6xd4+ ♔e3-f4 ♗d5-c6 ♕c1-d2 ♕a6-c4 ♔f4-g3 a7-a5 ♖h7-h4 ♔d6-c5 f2-f3 ♗d4-e5+ f3-f4 ♕c4-b3+ ♔g3-g4 ♕b3-f3+ ♔g4-g5 ♗e5-d4 ♕d2-c2+ ♔c5-d6 ♕c2-h2 ♗c6-e4 f4-f5+ ♗d4-e5 ♕h2-h3 ♗e5-f4+ ♔g5-f6 ♕f3-f2 a3-a4 ♗e4xf5 ♕h3-a3+ ♔d6-c6 ♖h4xf4 ♕f2xf4 ♕a3-e7 ♗f5-c2+ ♔f6-g7 ♕f4-d4+ ♔g7-g8 e6-e5 ♕e7-e8+ ♔c6-b7 ♕e8-e7+ ♔b7-a6 ♕e7-f6 ♕d4-e4 ♔g8-g7) +7.78/34 107)

score for Black +7.78 depth 34

Jul-23-20  saturn2: White threatens mate but black is quicker with the check .37.. .Bxd4. Got this one with the lonley rook on h7.
Jul-23-20
Premium Chessgames Member
  Predrag3141: On move 37, Black has only three reasonable candidates to prevent mate-in-1, and one of them is lame for a puzzle: 37 ... Qc4. So rule out 37 ... Bg5 and notice the loose rook, and you've got it. I might have missed 37 ... Bxd4+ over the board though.
Jul-23-20  Walter Glattke: Joey Yeomans: see my comment above, 37.-Bg5 will be answered with 38.f4!
Jul-23-20  Brenin: The combination starting with 37 ... Bxd4+ and finishing with either mate or the capture of the hanging R, is decisive, but provided Black notices the threatened mate on c7, and stops it with 37 ...Be7, Bd8 or Bc4, he's going to win anyway, with his Q+2B controlling the diagonals around White's exposed K. Note that after 37 ... Be7, the sacrifice 38 Rxe7 Kxe7 39 Qc7+ doesn't lead to perpetual check, e.g. 39 ... Ke8 40 Qb8+ Kd7.
Jul-23-20
Premium Chessgames Member
  drollere: the hanging rook is glaring on a board with two bishops, so Bxd4+ is not hard to find. i failed to find a successful escape for the white K, and declining the sacrifice leaves Bc5, locking out the mating threat.
Jul-23-20  TheaN: <37....Bxd4+> As a few have already mentioned, probably the hardest part of this Thursday is to notice that if White declines, Black just snatched the most important pawn on the board (for either side pretty much) and will choke White in the resulting endgame. Kf4 is better than Kd2 for what it's worth, as the king's at least further away from the Black pieces.

After the accept <38.Kxd4 Qa4+ 39.Kc3> Kd3 and Ke3 allow Black to win the rook outright <39....Qc4+> you only need to realize that 40.Kb2? Qb3+ 41.Ka1 Qa2#, so <40.Kd2 Qd4+ -+> and Black's having fresh rook for lunch.

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