Author: Joachim Rang
Date: 05:49:10 10/02/03
Recently Pierre posted a very beautiful position, in which white can win in an obviously lost position. http://talkchess.com/forums/1/message.html?318847 All engines need either very much time to solve this or can't solve it at all. There are a few exceptions of programs, which do not consider underpromotions, since black can prolong being mated by underpromotions. So Tao, Amateur and Aristarch see a mate where there actually is no mate (yet). But SmarThink 0.17a can solve this in a few seconds on depth 8 even with the right evaluation! Older versions of SmarThink can't solve this, so I think it's due to the new "same thread extensions" which described Sergei here: http://talkchess.com/forums/1/message.html?318833 By the way, the posted position is a mirror position to the so-called "Georgian peaseant", which was also posted here long ago. Consequently SmarThink solves this too on the same depth (8)! Here are the positions and the Analysis: Chessbase Puzzle: 8/k3P3/p3K2n/1n3p2/1N4b1/1P1p1p2/8/4B3 w - - 0 1 SmarThink 017 WB1 111 MB: D5 00:00 2,05 b4c6 a7b7 c6a5 b7b6 a5c4 b6c5 e1f2 b5d4 f2d4 c5d4 e7e8 f5f4 D5 00:00 0,00 b4c6 a7b7 c6a5 b7b6 a5c4 b6c5 e1f2 c5b4 f2e1 b4c5 e1f2 c5b4 f2e1 b4c5 e1f2 c5b4 f2e1 b4c5 e1f2 c5b4 D6 00:00 -0,01 b4c6 a7b7 c6a5 b7b6 a5c4 b6c5 e1f2 c5b4 f2e1 b4b3 c4d2 b3c2 e7e8 b5c7 D6 00:01 -4,29 b4c6 a7b7 c6a5 b7b6 a5c4 b6c5 e1f2 c5b4 f2e1 b4b3 c4d2 b3c2 e7e8 b5c7 e6d7 c7e8 d7e8 D6 00:01 -4,28 b4d3 b5c7 e6d7 f3f2 d3f2 a7b6 D6 00:01 -2,83 b4d3 f5f4 e6e5 g4h5 e5f4 D7 00:01 -2,84 b4d3 f5f4 e6e5 g4h5 e5f4 h6g8 e1f2 a7b8 f4g5 h5f7 D7 00:01 -2,97 b4d3 f5f4 e6f6 b5d6 e1f2 a7a8 e7e8 d6e8 f6g5 e8d6 g5h6 d6e4 D7 00:01 -2,96 e7e8 b5c7 e6d7 c7e8 d7e8 g4h5 e8d7 h5f7 e1f2 a7b7 b4d3 f7b3 d3c5 D7 00:02 -2,96 e7e8 b5c7 e6d7 c7e8 d7e8 g4h5 e8d7 h5f7 e1f2 a7a8 b4d3 f7b3 D7 00:02 -2,95 e1f2 a7b7 b4d3 b5c7 e6f6 c7e8 f6g6 h6g8 d3c5 b7b6 g6f7 g8f6 c5e4 D7 00:02 -2,81 e1f2 a7b7 b4d3 b5c7 e6f6 c7e8 f6g6 h6g8 d3c5 b7c6 g6f7 g8f6 c5a6 f5f4 a6b4 c6d6 f7f8 D8 00:03 -2,82 e1f2 a7b7 b4d3 b5c7 e6f6 c7e8 f6g6 h6g8 d3c5 b7c6 g6f7 g8f6 c5a6 f5f4 a6b4 c6d6 f7f8 g4f5 D8 00:03 -2,96 e1f2 a7b7 b4d3 b5c7 e6f6 c7e8 f6g6 h6g8 d3c5 b7c6 g6f7 g8f6 c5a6 f5f4 a6b4 c6d6 f7f8 g4f5 D8 00:04 -2,95 b4d3 f5f4 e6f6 b5d6 f6g5 g4f5 d3f2 h6f7 g5f4 D8 00:04 -2,65 b4d3 f5f4 e6f6 g4d7 d3e5 d7e8 e1f2 a7b7 f6g7 h6f5 g7f8 b5d6 e5f3 D8 00:08 -2,64 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 D8 00:10 0,36 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 D9 00:12 0,35 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 D9 00:19 0,08 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 D10 00:39 0,09 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 D10 01:08 0,23 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 D11 01:57 0,24 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 D11 03:24 0,65 b4c6 a7b7 c6a5 b7b6 e1f2 b6a5 e7e8 b5c7 e6d6 c7e8 d6c5 d3d2 f2d4 Georgian Peaseant: 8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1 SmarThink 017 WB1 111 MB: D5 00:00 2,41 g4f6 h7g7 f6h5 g7g6 h5f4 g6f5 d1c2 f5g4 d7d8 c5c4 D5 00:00 0,00 g4f6 h7g7 f6h5 g7g6 h5f4 g6f5 d1c2 f5g4 c2d1 g4f5 d1c2 f5g4 c2d1 g4f5 d1c2 f5g4 c2d1 g4f5 d1c2 f5g4 D6 00:00 -0,01 g4f6 h7g7 f6h5 g7g6 h5f4 g6f5 d1c2 f5g4 c2d1 g4g3 f4e2 g3f2 d7d8 g5f7 D6 00:01 -4,29 g4f6 h7g7 f6h5 g7g6 h5f4 g6f5 d1c2 f5g4 c2d1 g4g3 f4e2 g3f2 d7d8 g5f7 d6d7 f7d8 d7d8 D6 00:01 -4,28 g4e3 g5f7 d6e7 a6b8 D6 00:01 -2,83 g4e3 c5c4 d6d5 b4a5 d5c4 D7 00:01 -2,84 g4e3 c5c4 d6d5 g5f7 d1c2 h7g8 e3f5 b4f8 d5c4 f7e5 D7 00:01 -2,84 g4e3 c5c4 d6d5 g5f7 d5c4 D7 00:02 -2,83 d1c2 h7g7 g4e3 g5f7 d6c6 f7d8 c6b6 a6b8 e3f5 g7g6 b6c7 b8c6 f5e7 D7 00:02 -2,83 d1c2 h7g7 g4e3 g5f7 d6c6 f7d8 c6b6 a6b8 e3f5 g7f8 b6c7 b8c6 f5h6 b4a5 c7d6 c6d4 D8 00:03 -2,84 d1c2 h7g7 g4e3 g5f7 d6c6 f7d8 c6b6 a6b8 e3f5 g7f8 b6c7 b8c6 f5h6 b4a5 c7d6 c6d4 c2d1 c5c4 D8 00:04 -2,93 d1c2 h7g7 g4e3 g5f7 d6c6 f7d8 c6b6 a6b8 e3f5 g7f8 b6c7 b8c6 f5h6 b4a5 c7d6 c6d4 c2d1 c5c4 g3g4 a5b6 D8 00:04 -2,92 g4e3 c5c4 d6c6 g5e6 c6b5 b4c5 e3d5 a6b8 d1c2 D8 00:05 -2,66 g4e3 b4a5 d6e7 a6b4 d1c2 h7g7 e7e8 a5c7 D8 00:05 -2,65 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 g5f7 d6e6 f7d8 e6f5 D8 00:06 0,27 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 g5f7 d6e6 f7d8 e6f5 D9 00:14 0,26 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 h5g4 d8e8 c5c4 d6e5 D9 00:33 0,26 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 h5g4 d6c6 g4g3 d8d3 g3f2 c2d1 c5c4 d3e2 f2g1 e2e3 g1f1 c6b5 D10 00:46 0,27 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 h5g4 d6c6 g4g3 d8d3 g3f2 c2d1 c5c4 d3e2 f2g1 e2e3 g1f1 c6b5 c3c2 d1c2 D10 01:04 0,47 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 h5g4 d6c6 g4g3 d8d3 g3f2 c2d1 c5c4 d3e2 f2g1 e2e3 g1f1 c6b5 c3c2 D11 01:42 0,48 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 h5g4 d6c6 g4g3 d8d6 g3f3 c2d1 f3g2 d6h6 g5h3 h6e3 a6b8 c6b5 D11 02:16 0,62 g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8 h5g4 d6c6 g4g3 d8d6 g3f3 c2d1 f3g2 d6h6 g5h3 h6e3 a6b8 c6b5
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