patzer2: Surprisingly strong play and difficulty for this Blindfold game, which includes today's Wednesday July 5, 2017 puzzle (32. ?):
<1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.Qc2 dxc4 7.e4 c5 8.d5 exd5 9.exd5 Bd6 10.Bg5 O-O 11.O-O-O Nbd7 12.Bxc4 Qb8 13.Kb1 a6 14.Ne4 Nxe4 15.Qxe4 Re8 16.Qg4 Nf8 17.Bd3 Bc8 18.Qh5 Qc7 19.Rc1 Bd7 20.Bd2 Bb5 21.Bc2 Be2> Up till now, Black has played well and even appears to have a slight advantage.
This move (21...Be2) is fine, but a solid alternative is 21...Rad8 22.Rhe1 Bf4 23.g3 Bxd2 24.Nxd2 Rxe1 25.Rxe1 Qd7 26.Be4 h6 27. b3 a5 = to (-0.13 @ 30 depth, Stockfish 8.)
<22.Rhe1 Bxf3?> This not-so-obvious error releases the tension too soon and turns over the advantage to White.
Better instead is maintaining the tension with 22...Qd7 when play might continue 22...Qd7 23.Ka1 Rab8 24.Bf5 Qb7 25.Bc3 Bxf3 26.Qxf3 b5 27. Bd3 a5 = (-0.15 @ 31 depth, Stockfish 8.)
<23.Qxf3 b5 24.h4 Re7 25.Rxe7 Qxe7 26.h5 Re8 27.h6 gxh6?> This appears to be Black's decisive error. Instead, Black can hold on and defend against White's initiative, and put up much stronger resistance, with 27...g6.
After 27...g6 play might continue 27...g6 28.Re1 Qd8 29.Qc3 Rxe1+ 30.Bxe1 f6 31.f4 Qe7 32.Bd2 Kf7 33.Qa5 Qb7 34.Be4 Bc7 35.Qc3 Bd6 36.g4 Qe7 37.Bf3 Nd7 38.Ka2 Nf8 39.Qa5 Qa7 40.g5 fxg5 41.fxg5 Ke8 42.a4 Qb7 43.Qc3 Qe7 44.axb5 axb5 45.Qa3 Qb7 46.Qe3+ Qe7 = (+0.13 @ 35 depth, Stockfish 8.)
<28.Re1 Qd8 29.Rh1 b4 30.axb4 cxb4 31.Rxh6 a5> Black can put up more resistance with 31...Qe7 but White still wins after 31...Qe7 32.Qf5 when play might continue 32...Ng6 33.Rh1 b3 34.Bxb3 Qe4+ 35.Qxe4 Rxe4 36.Rc1 Ne7 37.Rc4 Re2 38.Bc3 a5 39.Ra4 Bc7 40.Bxa5 Bxa5 41.Rxa5 Nf5 42.g4 Nd6 43.Ra6 Nb7 44.Ra7 Nc5 45.d6 Rd2 46.Bc4 Rd4 47.b3 Rxd6 48.Rxf7 Kh8 49.Kc2 Ne4 50.f3 Ng5 51.Rf5 Ne6 52.Bxe6 Rxe6 53.Kd3 (+17.60 @ 27 depth, Stockfish 8).
<32.Bxh7+!!>This neat demolition solves today's Wednesday July 5, 2017 chessgames.com puzzle.
<32...Nxh7 33.Qg4+!> This in-between move is necessary. If White plays the immediate 33.Qf5, Black escapes with a draw after 33. Qf5 Nf8! 34.Qg4+ Ng6 35.Rxg6+ fxg6 36.Qxg6+ Kh8 (not 36...Kf8?? 37.Bh6+ Ke7 38.Qe6# ) 37.Bg5 Be7 38.Qh6+ Kg8 39.Qg6+ Kh8 40.Qh6+ Kg8 41.Qg6+ Kh8 42.Qh6+ Kg8 43.Qg6+ Kh8 44.Qh6+ = (draw by perpetual check.)
<33...Kh8 34.Qf5 1-0> Black resigns in lieu of 34...Kg8 (34...Kg7 35.Rxh7+ Kf8 36.Qxf7#) 35.Qxh7+ Kf8 36.Qh8+ Ke7 37.Qf6+ Kd7 38.Qxd6+ Kc8 39.Qa6+ Kd7 40.Qc6+ Ke7 41.Bg5+ Kf8 42.Rh8+ Kg7 43.Qh6#.