Author: Uri Blass
Date: 09:07:44 11/16/02
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On November 16, 2002 at 11:06:50, John Merlino wrote: >On November 16, 2002 at 10:34:14, Steffen Basting wrote: > >>Hi! >>A position of a game I played: >>[D] 4n3/2q3kb/1p6/2p1P1p1/1PPp1QNb/7B/7P/B5K1 w - - 0 1 >> >>How long does it take your engine to play Nf6 and then Fail Low on it? >> >>Regards, Steffen > >Good position. CM9000, on a P3-733, plays Nf6 from the beginning, fails low at >54 seconds, and does not choose another move (Qf3) until 6:39. Brutal.... > >Time Depth Score Positions Moves >0:01 1/6 -0.11 57349 1.Qf1 Qf7 2.Qxf7+ Kxf7 3.Nh6+ Kf8 > 4.Bf5 Bxf5 5.Nxf5 >0:00 1/3 0.61 1670 1.Nf6 Qf7 2.Nxe8+ Qxe8 3.Qf6+ Kg8 > 4.Qxb6 >0:00 1/4 0.91 4322 1.Nf6 Bg6 2.Nxe8+ Bxe8 3.Qf6+ Kg8 >0:00 1/5 0.82 11516 1.Nf6 Bg6 2.Nxe8+ Bxe8 3.Qf6+ Kg8 > 4.Be6+ Bf7 5.Bd5 Bxd5 6.cxd5 >0:00 1/6 0.82 34137 1.Nf6 Bg6 2.Nxe8+ Bxe8 3.Qf6+ Kg8 > 4.Bg2 Bf7 5.Bd5 Bxd5 6.cxd5 >0:01 1/7 0.82 81811 1.Nf6 Bg6 2.Nxe8+ Bxe8 3.Qf6+ Kg8 > 4.Be6+ Bf7 5.Bd5 Bxd5 6.cxd5 >0:02 1/8 0.82 154080 1.Nf6 Bg6 2.Nxe8+ Bxe8 3.Qf6+ Kg8 > 4.Be6+ Bf7 5.Bd5 Qa7 6.Bb2 Qd7 >0:04 1/9 0.67 367776 1.Nf6 Bg6 2.Nxe8+ Bxe8 3.Qf6+ Kg8 > 4.Bf5 Qg7 5.Qxb6 Qxe5 6.Qe6+ Qxe6 > 7.Bxe6+ Bf7 8.Bxf7+ Kxf7 9.bxc5 >0:09 2/10 0.67 815044 1.Nf6 Bg6 2.Nxe8+ Bxe8 3.Qf6+ Kg8 > 4.Bf5 Qg7 5.Qxb6 Qxe5 6.Qe6+ Qxe6 > 7.Bxe6+ Kf8 8.bxc5 d3 >0:24 3/11 0.12 2170297 1.Nf6 gxf4 2.Nxe8+ Kh6 3.Nxc7 f3 > 4.Bxd4 cxd4 5.Bg4 Kg5 6.Bxf3 Kf4 > 7.Be2 Kxe5 >0:54 4/12 -4.79 4976974 1.Nf6 gxf4 2.Nxe8+ Kh6 3.Nxc7 f3 > 4.Bf1 Be4 5.h3 Bg3 6.Be2 fxe2 7.Bc3 > dxc3 >6:39 4/12 -0.26 33613583 1.Qf3 Bg8 2.Bf1 Qf7 3.Kg2 Qxf3+ > 4.Kxf3 Be1 5.bxc5 bxc5 6.Bd3 Bf7 > 7.Nf2 Bh5+ 8.Kg3 Nc7 > >jm Movei is faster than the king in finding Qf3 It does not see the -4.79 for Nf6 but the fail low at depth 10 is enough for it to change it's mind Movei's analysis(PIII850 Mhz) depth=10 +0.15 g4f6 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7e4 c7d5 Nodes: 1311337 NPS: 121758 Time: 00:00:10.77 depth=10 +0.15 g4f6 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7e4 c7d5 Nodes: 4881203 NPS: 130863 Time: 00:00:37.30 depth=11 -0.18 g4f6 g5f4 f6e8 g7h6 e8c7 f4f3 h3f1 h7e4 h2h3 h4g3 a1d4 c5d4 Nodes: 5472445 NPS: 131612 Time: 00:00:41.58 depth=11 -0.17 f4f1 Nodes: 7593075 NPS: 134082 Time: 00:00:56.63 depth=11 -0.14 f4f1 c7f7 f1f7 g7f7 g4h6 f7e7 a1b2 e8g7 b2a3 g7e6 h3f5 h7f5 h6f5 e7d7 g1g2 d4d3 Nodes: 13531267 NPS: 134693 Time: 00:01:40.46 depth=11 -0.13 f4f3 Nodes: 20422964 NPS: 133947 Time: 00:02:32.47 depth=11 -0.03 f4f3 h7g6 f3e2 c7c6 b4c5 c6c5 e5e6 g7g8 e2e5 d4d3 e5c5 b6c5 Nodes: 28126728 NPS: 132423 Time: 00:03:32.40 depth=12 +0.00 f4f3 c7f7 f3c6 h7g6 b4c5 b6c5 c6c5 f7f3 c5a7 g7f8 a7c5 f8g7 Nodes: 47747792 NPS: 133209 Time: 00:05:58.44 After Nf6 it has the following analysis 9 -81 1499 2298149 h7g6 f6e8 g6e8 f4f6 g7h7 h3f5 h7g8 f5e6 e8f7 f6g6 g8f8 g6h7 c7a7 a1b2 d4d3 h7h8 f8e7 h8f6 e7e8 b4c5 f7e6 f6e6 10 -159 1856 2845846 h7g6 f6e8 g6e8 f4f6 g7h7 h3f5 h7g8 f5e6 g8h7 f6f8 c7c6 f8g8 h7h6 e6f5 g5g4 g8g4 h4g5 10 -159 1856 2845846 h7g6 f6e8 g6e8 f4f6 g7h7 h3f5 h7g8 f5e6 g8h7 f6f8 c7c6 f8g8 h7h6 e6f5 g5g4 g8g4 h4g5 10 -158 1911 2938789 g5f4 10 345 2279 3576166 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1g2 h7d3 g4e2 d3e2 10 345 2488 3859877 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1g2 h7d3 g4e2 d3e2 11 375 2603 4063864 g5f4 11 375 3015 4731504 g5f4 12 793 4888 7728061 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d3 f2f1q d3d4 h4f2 d4d5 f1d3 d5e6 d3c4 c7d5 12 793 5305 8356677 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d3 f2f1q d3d4 h4f2 d4d5 f1d3 d5e6 d3c4 c7d5 13 843 9436 14744917 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d2 f2f1q c7d5 h4e1 d2e3 f1e2 e3d4 e2h2 d5b6 e1b4 d4d3 h2e5 13 843 10485 16373799 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d2 f2f1q c7d5 h4e1 d2e3 f1e2 e3d4 e2h2 d5b6 e1b4 d4d3 h2e5 14 966 24892 38620010 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d3 f2f1q d3d4 f1f3 c4c5 h4f2 d4c4 f3f7 c7d5 b6b5 c4b5 f7d5 14 966 28132 43673088 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d3 f2f1q d3d4 f1f3 c4c5 h4f2 d4c4 f3f7 c7d5 b6b5 c4b5 f7d5 15 966 35476 55567284 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d3 f2f1q d3c3 h4e1 c3d4 f1f3 c4c5 e1f2 d4c4 f3f7 c7d5 b6b5 c4b5 f7d5 15 966 43924 69313029 g5f4 f6e8 g7h6 e8c7 f4f3 a1d4 c5d4 h3g4 f3f2 g1f1 h7d3 g4e2 d3e2 f1e2 d4d3 e2d3 f2f1q d3c3 h4e1 c3d4 f1f3 c4c5 e1f2 d4c4 f3f7 c7d5 b6b5 c4b5 f7d5 16 996 74446 119667973 g5f4 Interesting that movei never see scores that are close to 0.00 with black when it can see them with white when it likes Nf6 and I guess that the reason is different pruning that is dependent on alpha and beta and on other factors. Movei is not supposed to be good in finding mates so I expect chessmaster to be able to find a forced mate for black after Nf6 Uri
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