One more issue with king safety/attack for Stockfish
Posted: Wed Jul 17, 2019 1:28 am
From the game Vitiugov - Grischuk (Riga Grand Prix 2019).
https://www.chessbomb.com/arena/2019-ri ... _Alexander
Stockfish wants to play the mistake 20.Nxe4? with a big advantage (+3) for a long time because it has trouble to see 20...Qxg6! for black.
Houdini 1.5 and Critter 1.6a find Qxg6 is less than 0.1 second.
[d]2kr3r/p5p1/2pq4/n1b1pb2/4N1p1/3PB1P1/PPP1BPK1/R3QR2 b - - 0 20
https://www.chessbomb.com/arena/2019-ri ... _Alexander
Stockfish wants to play the mistake 20.Nxe4? with a big advantage (+3) for a long time because it has trouble to see 20...Qxg6! for black.
Houdini 1.5 and Critter 1.6a find Qxg6 is less than 0.1 second.
[d]2kr3r/p5p1/2pq4/n1b1pb2/4N1p1/3PB1P1/PPP1BPK1/R3QR2 b - - 0 20
Code: Select all
Stockfish_19071209_x64_modern:
Found 511 tablebases
...
34/55 01:17 612 703 556 7 888 142 +4,09 20. ... Bxe4+ 21.dxe4 Nb7 22.Bxg4+ Kb8 23.Rd1 Qe7 24.Rxd8+ Rxd8 25.Rh1 Rf8 26.Rh7 Bb6 27.Qc3 Bxe3 28.Qxe3 a5 29.Rh5 g6 30.Rh6 Qc5 31.Qd2 Qc4 32.Bf3 Qf7 33.Qe3 Qg7 34.Be2 Rd8 35.Bg4 Rd6 36.c3 c5 37.Qg5 Ka7 38.b3 Ka6 39.Bf5 Kb6
35/54+ 01:27 690 987 911 7 875 942 +4,18 20. ... Bxe4+ 21.dxe4
35/60- 01:29 707 439 196 7 877 328 +4,09 20. ... Bxe4+
35/60 01:32 725 748 551 7 884 286 +4,12 20. ... Bxe4+ 21.dxe4 Nb7 22.Bxg4+ Kc7 23.Rd1 Qe7 24.Rxd8 Rxd8 25.Rh1 Re8 26.Rh7 Bb6 27.Bh6 Kb8 28.Qd2 Rd8 29.Qc3 Qf6 30.Be3 Kc7 31.Rh5 Nd6 32.Bxb6+ axb6 33.Qxe5 Re8 34.Qxf6 gxf6 35.Rh7+ Kb8 36.f3 Nc4 37.Kh3 Nxb2 38.Bd7 Rd8 39.Bxc6 Nc4 40.Bd5 Ne3 41.c4 Kc8
36/57- 02:00 936 629 206 7 801 277 +4,03 20. ... Qg6
36/57- 02:00 936 747 385 7 801 287 +3,92 20. ... Qg6
36/57- 02:00 936 900 658 7 801 329 -2,91 20. ... Qg6
36/57 02:00 938 603 260 7 800 113 -3,89 20. ... Qg6 21.Rh1 Bxe4+ 22.dxe4 Rxh1 23.Qxh1 Bxe3 24.Qh4 Qxe4+ 25.Kf1 Rf8 26.Qxg4+ Qxg4 27.Bxg4+ Kc7 28.Ke2 Bd4 29.f3 Bxb2 30.Rb1 Bd4 31.a4 Rh8 32.Kd3 Nb7 33.a5 Bf2 34.Bf5 Nxa5 35.Be4 Nb7 36.Ke2 Bd4 37.Bd3 Nc5
37/42- 02:07 986 277 842 7 763 644 -3,99 20. ... Qg6
37/46- 02:10 1 010 990 683 7 769 201 -4,08 20. ... Qg6
37/61- 02:27 1 154 003 847 7 813 689 -5,04 20. ... Qg6