Author: Tim Foden
Date: 09:32:23 10/02/03
Go up one level in this thread
On October 02, 2003 at 11:42:07, Robin Smith wrote: >On October 02, 2003 at 09:43:19, Tim Foden wrote: > >>On October 02, 2003 at 08:49:10, Joachim Rang wrote: >> >>>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: >>> >>>[d]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 >> >>Maybe I'm missing something here, but the final position from this PV is... >> >>[d]4n3/8/p6n/k2K1p2/3B2b1/1P3p2/3p4/8 b - - >> >>Which GLC reckons is a mate in 6 for Black... >> >> 10 8.642 +Mate06 19660k Kb5 8. b4 d1=Q 9. Ke5 Qd2 10. Bc5 Kc6 11. Ke6 Qe2+ >> 12. Be3 Qxe3# >> >>So I'm confused... are you saying that Nc6 is the solution, or the wrong move? >> >>Cheers, Tim. :) > >You have the wrong position. In your diagram, the White king should be on c5, >not d5. > >Robin Ahhh... that explains it! Thanks, Tim.
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