Author: Tim Foden
Date: 06:43:19 10/02/03
Go up one level in this thread
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. :)
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