Author: Bryan Hofmann
Date: 09:27:16 04/24/04
Go up one level in this thread
On April 23, 2004 at 20:34:23, Dieter Buerssner wrote: >Both from ICC games Yace-Amateur. > >[D] 8/8/4kp2/2B5/p1pP1P1p/5b2/1P1K2P1/8 w - - 0 48 bm d5+; > >Black just made the (to me) surprising move Bxf3!?. If White takes the B, he >will lose, because he cannot avoid the promotion of the h-pawn anymore. (Finding >Bxf3 might also be considered as an interesting test position, but it is not >enough to win). >[Will, what I told you about the position was rather wrong ...] > Tao 5.6 belives that d5+ is the best move here and finds it in 1 sec. 1 00:00 2.96 gxf3 2 00:00 1.87 gxf3 h3 2+ 00:00 1.87 f5+ 2 00:00 2.38 f5+ Kxf5 gxf3 3 00:00 1.28 f5+ Kxf5 gxf3 h3 3+ 00:00 1.28 gxf3 3 00:00 2.36 gxf3 h3 Kc3 4 00:00 2.14 gxf3 h3 f5+ Kxf5 Bd6 5 00:00 1.46 gxf3 h3 d5+ Kxd5 Bg1 f5 6 00:00 -0.77 gxf3 Kd5 Be7 h3 Bxf6 h2 6+ 00:00 -0.77 f5+ 6 00:00 -0.21 f5+ Kd7 Kc3 Bxg2 Kxc4 h3 Kc3 7 00:00 -0.32 f5+ Kd7 Kc3 Bxg2 Ba7 Be4 Bb8 Bxf5 Kxc4 7+ 00:00 -0.32 gxf3 7 00:00 1.32 gxf3 c3+ bxc3 h3 d5+ Kxd5 Bg1 a3 Kd3 8 00:00 -1.07 gxf3 Kd5 Ke3 h3 Kf2 a3 Bxa3 h2 8+ 00:00 -1.07 f5+ 8 00:00 -0.23 f5+ Kd7 Ke3 Bxg2 Ba7 h3 Bb8 Kc6 Bg3 8+ 00:00 -0.23 d5+ 8 00:00 -0.20 d5+ Bxd5 Bf2 Bxg2 Bxh4 Bd5 Kc3 Kf5 Kd4 9 00:00 -0.26 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Kc3 Bf1 Bf2 Ke4 9+ 00:00 -0.26 gxf3 9 00:00 0.60 gxf3 c3+ bxc3 Kd7 Ke3 h3 Kf2 a3 Bxa3 h2 10 00:00 -1.36 gxf3 a3 bxa3 Kd5 Ke3 h3 Kf2 c3 Kg3 c2 10+ 00:01 -1.36 d5+ 10 00:01 -0.20 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Kc3 Bf1 Kb4 Ke4 Bg5 11 00:01 -0.23 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Kc3 Bf1 Bf6 Ke4 Be5 Be2 12 00:02 -0.19 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Kc3 Bf1 Bf6 Ke4 Be5 Be2 Kb4 13 00:03 -0.21 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Be5 Bd3 Ke3 Bc2 Bc3 Bd1 14 00:05 -0.21 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Be5 Bd3 Ke3 Bc2 Bc3 Be4 Bb4 15 00:09 -0.21 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Be5 Bd3 Ke3 Bc2 Bc3 Be4 Bb4 Ke6 16 00:18 -0.21 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Ke3 Bd3 Bc3 Bb1 Bb4 Bc2 Kf2 Ke4 Bd6 17 00:33 -0.21 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Ke3 Bd3 Bc3 Bb1 Bb4 Bc2 Kd2 Bb3 Ke3 Bd1 18 01:03 -0.21 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Ke3 Bd3 Bc3 Bb1 Bb4 Bc2 Kd2 Bd3 Ke3 Be4 Bc3 19 02:12 -0.21 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Ke3 Bd3 Bc3 Bb1 Bb4 Bc2 Kd2 Bd3 Ke3 Be4 Bc3 Ke6 20 04:42 -0.19 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Bf1 Kc3 Be2 Be5 Bd3 Kb4 Bc2 Kc3 Bd1 Bf6 Ke4 Be5 Bb3 Bd6 If we back things up one move, Tao would have also chosen to move Bxf3. Note, I guessed at the position of the bishop as you did not specify its location, not that it matters much. 1 00:00 -2.96 Bxf3 gxf3 1 00:00 -0.24 Bc6 1 00:00 -0.14 Kf5 2 00:00 -0.29 Kf5 Ke3 2+ 00:00 -0.29 h3 2 00:00 -0.23 h3 gxh3 Bxf3 3 00:00 -0.22 h3 gxh3 Kf5 4 00:00 -0.39 h3 gxh3 a3 Bxa3 Bxf3 4+ 00:00 -0.39 Kf5 4 00:00 -0.33 Kf5 Ke3 Bc6 Be7 5 00:00 -0.31 Kf5 Ke3 Bc6 Bb4 Bd5 6 00:00 -0.36 Kf5 Ke3 Bc6 Bb4 Bd5 Be1 6+ 00:00 -0.36 Bc6 6+ 00:00 -0.36 Bb7 6 00:00 -0.35 Bb7 Ke3 Bc6 Bb4 f5 Be1 7 00:00 -0.41 Bb7 Ke3 Bc6 Bb4 Kd5 Be1 a3 bxa3 7+ 00:00 -0.41 Bc6 7 00:00 -0.32 Bc6 Ke3 Kf5 Be7 Kg6 Bd8 Kf5 7+ 00:00 -0.32 Kf5 7+ 00:00 -0.32 Bxf3 7 00:00 0.21 Bxf3 d5+ Bxd5 Bf2 Bxg2 Bxh4 Bd5 Ke3 8 00:00 -1.32 Bxf3 gxf3 c3+ bxc3 h3 d5+ Kxd5 Bg1 a3 Kd3 8+ 00:00 -1.32 Bc6 8 00:00 -0.38 Bc6 Ke3 Bd7 Bb4 Kd5 Be7 Ke6 Bc5 8+ 00:00 -0.38 Kf5 8+ 00:00 -0.38 c3+ 8 00:00 -0.32 c3+ bxc3 Bc4 Ke3 Bf1 Kf2 Bd3 f5+ Bxf5 Ke3 9 00:00 0.06 c3+ Kxc3 Bxf3 d5+ Bxd5 Bf2 Bxg2 Bxh4 Kf5 Bg3 Be4 9+ 00:00 0.06 Bxf3 9 00:00 0.21 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Ke3 Be4 Bf6 10 00:01 -0.60 Bxf3 gxf3 c3+ bxc3 Kd7 Ke3 h3 Kf2 a3 Bxa3 h2 10+ 00:01 -0.60 c3+ 10 00:01 -0.32 c3+ bxc3 Kf5 Ke3 Bc4 Bd6 Bf1 Kf2 Bc4 Be7 Ke6 11 00:01 -0.20 c3+ bxc3 a3 Kc2 Kd7 Bxa3 Bxf3 Bf8 Bxg2 Bg7 Be4+ Kd2 f5 11+ 00:01 -0.20 Bxf3 11 00:02 0.20 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Kc3 Bf1 Kb4 Ke4 Bg5 12 00:03 0.23 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Kc3 Bf1 Bf6 Ke4 Be5 Be2 13 00:04 0.20 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Kc3 Bf1 Bf6 Be2 Kd2 Bd3 Ke3 14 00:05 0.21 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Be4 Ke3 Ke6 Bc3 Bc6 Bb4 Be4 15 00:09 0.20 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Be4 Ke3 Bb1 Be5 Bc2 Bc3 Bd3 Bb4 16 00:26 0.21 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Be4 Ke3 Bb1 Be5 Bc2 Bc3 Bd3 Bb4 Be4 17 00:45 0.21 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Be4 Ke3 Bb1 Be5 Bc2 Bc3 Bd3 Bb4 Be4 Bc3 18 01:08 0.21 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Be4 Ke3 Bb1 Be5 Bc2 Bc3 Bd3 Bb4 Be4 Bc3 Ke6 19 02:06 0.20 Bxf3 d5+ Kxd5 Bf2 Bxg2 Bxh4 f5 Bf6 Be4 Ke3 Bb1 Be5 Bc2 Bc3 Bd1 Be5 Bh5 Bd4 Bg4 Bc3 > >From another game: > >[D] 3b4/3B4/4n3/5kp1/8/6P1/6K1/8 b - - 21 69 am g4; > >After g4, white has a draw - the black King cannot do anything sensible anymore, >because he has to defend the pinned knight. Ke5 (and probably other moves, too) >is winning. If your engine avoids g4 soon, it might still be interesting to >compare the scores after g4 and Ke5. Can any engine show something close to draw >score after g4?. Tao does not even consider g4; 1 00:00 3.47 Ba5 1 00:00 3.53 Bb6 1 00:00 3.58 Ke5 2 00:00 3.56 Ke5 Bc6 3 00:00 3.66 Ke5 Bxe6 Kxe6 4 00:00 3.51 Ke5 Bxe6 Kxe6 Kf3 4+ 00:00 3.51 Bb6 4 00:00 3.63 Bb6 Bb5 Ke5 Bd3 5 00:00 3.58 Bb6 g4+ Kf6 Bxe6 Kxe6 Kf3 5+ 00:00 3.58 Ke5 5 00:00 3.66 Ke5 Bxe6 Kxe6 Kf3 Kd5 6 00:00 3.76 Ke5 Bb5 Nd4 Bc4 Ba5 Bd3 7 00:00 3.67 Ke5 Kf3 Nd4+ Ke3 Ba5 Kd3 Be1 g4 8 00:00 3.75 Ke5 Kf3 Nd4+ Ke3 Bc7 g4 Kd5 Bf5 Nxf5+ gxf5 9 00:00 3.72 Ke5 Kf3 Nd4+ Ke3 Nb3 Bc6 Bb6+ Kd3 Nc5+ Ke3 Ne6+ Kd3 Nd4 10 00:01 3.74 Ke5 Kf3 Ba5 g4 Nd4+ Ke3 Bb4 Kd3 Nf3 Bc6 Nd4 11 00:01 3.73 Ke5 Kf3 Ba5 g4 Bd2 Ke2 Bf4 Bxe6 Kxe6 Kf3 Kd5 12 00:03 3.74 Ke5 Kf3 Ba5 g4 Bb6 Ba4 Nd4+ Ke3 Kd5 Kd3 Nf3 Bb3+ Ke5 Bd1 13 00:07 3.76 Ke5 Kf3 Ba5 Bc8 Be1 g4 Bd2 Ke2 Bc1 Kd1 Ba3 Ke2 Bc5 Bxe6 Kxe6 14 00:10 3.77 Ke5 Kf3 Ba5 Bc8 Nd4+ Ke3 Bb6 Bb7 Nf5+ Kf3 Bg1 Kg4 Be3 Kf3 Bc1 Ba6 Nd4+ Kg4 15 00:15 3.77 Ke5 Kf3 Ba5 Bc8 Nd4+ Ke3 Bb6 Bd7 Kd5 Ba4 Nc6+ Kf3 Ne5+ Kg2 Bc5 Bc2 g4 Bb3+ Kd4 16 00:42 3.79 Ke5 Bc6 Nd4 Be8 Bb6 Kh3 Ba5 Bg6 Kd5 Kg2 Be1 g4 Ke5 Kf1 Nf3 Kg2 17 01:30 3.79 Ke5 Kf3 Nd4+ Ke3 Bb6 Bc8 Nf5+ Kf3 Bd8 g4 Nd6 Bd7 Bb6 Kg2 Nc4 Bb5 Kd5 Kg3 Ne5 Be2 18 01:52 3.80 Ke5 Kf3 Nd4+ Ke3 Bb6 Bc8 Nf5+ Kf3 Bd8 g4 Nd6 Bd7 Nc4 Bc8 Kd4 Kg2 Ba5 Bf5 Bb4 Kf2 19 02:24 3.80 Ke5 Kf3 Nd4+ Ke3 Bb6 Bc8 Nf5+ Kf3 Bd8 Kg4 Nd6 Bd7 Kd4 Kf3 Nc4 Kg2 If the g4 move is made Tao belives it is in a losing position and not a draw; 1 00:00 -3.49 Bc8 1 00:00 -3.43 Ba4 1 00:00 -3.41 Bb5 2 00:00 -3.62 Bb5 Ke5 2+ 00:00 -3.62 Bc6 2 00:00 -3.59 Bc6 Ke5 3 00:00 -3.61 Bc6 Ke5 Bb7 3+ 00:00 -3.61 Bb5 3 00:00 -3.56 Bb5 Ke5 Be2 4 00:00 -3.62 Bb5 Bb6 Be2 Nd4 4+ 00:00 -3.62 Bc6 4+ 00:00 -3.62 Be8 5 00:00 -3.60 Bb5 Nc5 Be2 Ne4 Bb5 5+ 00:00 -3.60 Be8 5+ 00:00 -3.60 Bc6 6 00:00 -3.63 Bb5 Nc5 Be8 Bc7 Bc6 Ke5 6+ 00:00 -3.63 Be8 6 00:00 -3.62 Be8 Nc5 Bb5 Bb6 Bc6 Ke5 7 00:00 -3.63 Be8 Nc5 Bb5 Bb6 Be8 Bc7 Bc6 Ke5 8 00:00 -3.78 Be8 Nc5 Bb5 Bc7 Be2 Ne4 Bd3 Ke5 8+ 00:00 -3.78 Ba4 8 00:00 -3.76 Ba4 Nc5 Bd1 Bc7 Bc2+ Ne4 Bd3 Be5 Bc2 8+ 00:00 -3.76 Kf2 8 00:00 -3.69 Kf2 Ke5 Bc8 Be7 Ke3 Bc5+ Kd3 Bf2 Bxe6 Kxe6 9 00:00 -3.70 Kf2 Ke5 Bc8 Bc7 Kg2 Bb6 Bb7 Nd4 Bc8 10 00:00 -3.69 Kf2 Ke5 Ba4 Nd4 Bd1 Kf5 Ba4 Bb6 Bd7+ Ne6+ Kg2 Ke5 11 00:00 -3.70 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kd5 Ba4 Nd4 Bd7 12 00:00 -3.71 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Bd6 Bc8 Bc5 Bd7 13 00:01 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Bd6 Ba4 Nd4 Bd1 Kf5 Ba4 14 00:01 -3.71 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Be3 Bc8 Bc5 Bd7 15 00:02 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Be3 Bc8 Bb6 Bd7 Kd5 Ba4 Nd4 Bd7 16 00:03 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Ba4 Nd4 Bd7+ Kg5 Ba4 Nf3 Bd1 Ne1+ Kh2 Kf5 17 00:06 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Kh2 Be7 Kg2 Ke5 Kh2 Bg5 Kg2 Be3 18 00:08 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Kh2 Be7 Kg2 Ke5 Kg1 Kd5 Kg2 Ke5 19 00:14 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Kh2 Be7 Kg2 Ke5 Kh2 Kd5 Kg2 Ke5 20 00:22 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Kh2 Be7 Kg2 Ke5 Kh2 Kd5 Kg2 Ke5 21 00:37 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Kh2 Be7 Kg2 Ke5 Kh2 Kd5 Kg2 Ke5 22 01:08 -3.70 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Kh2 Be7 Kg2 Ke5 Kh2 Bd6 Kg2 Ba3 Bc8 Bc1 Ba6 Nd4 Bc8 Nf5 Bxf5 Kxf5 23 02:07 -3.68 Kf2 Ke5 Kg2 Bb6 Kh2 Bc5 Kg2 Kf5 Kh2 Be7 Kg2 Ke5 Kh2 Bd6 Kg2 Ba3 Kh2 Bc1 Kh1 Bd2 Kg2 Be3 Bc6 24 08:47 -3.69 Kf2 Ke5 Kg2 Bb6 Kh1 Bc5 Kg2 Kd5 Kh2 Be7 Kg2 Bd6 Bc8 Ke5 Kh2 Bc5 Kg2 Bb4 Bd7 Be7 Bc8 Bb4 > >Regards, >Dieter
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