Author: Uri Blass
Date: 05:45:28 12/27/02
Go up one level in this thread
On December 27, 2002 at 07:48:51, Richard Pijl wrote: >On December 27, 2002 at 06:14:13, Jonathan Lee wrote: > >>[D]6bk/ppp2p1p/5P1P/8/8/8/8/1K6 w - - 0 1 > >I'm not sure what you want to see here. >Baron 0.99.4 beta 3 sees a very clear win for black (no mate score though): I guess some bug with null move pruning. Movei does not use null move pruning in positions when the number of legal moves is smaller than 10 so it has no problem not to see winning score for black. It does not see the draw but the main reason is not using hash tables for pruning(the last time that I tried it it did not help and I tried other things later instead of checking for the bug). Even without using hash tables for pruning it can fail high again and again to finally see draw score Here is the analysis after some minutes on p850(128 Mbytes hash). depth=21 -5.48 b1a2 a7a6 a2a3 a6a5 a3b3 b7b5 b3b2 a5a4 b2a3 c7c5 a3a2 c5c4 a2b2 b5b4 b2b1 a4a3 b1a2 c4c3 a2b3 a3a2 b3a2 c3c2 a2b2 nodes: 77900809 Time=22437 depth=22 -5.02 b1a2 a7a6 a2a3 a6a5 a3a2 a5a4 a2a3 b7b5 a3b4 c7c6 b4a3 c6c5 a3a2 c5c4 a2b2 b5b4 b2b1 c4c3 b1c2 a4a3 c2b3 a3a2 b3a2 Nodes: 84691055 NPS: 345804 Time: 00:04:04.91 depth=22 -5.02 b1a2 a7a6 a2a3 a6a5 a3a2 a5a4 a2a3 b7b5 a3b4 c7c6 b4a3 c6c5 a3a2 c5c4 a2b2 b5b4 b2b1 c4c3 b1c2 a4a3 c2b3 a3a2 b3a2 Nodes: 96125713 NPS: 347450 Time: 00:04:36.66 depth=23 -4.72 b1a2 Nodes: 107400827 NPS: 345840 Time: 00:05:10.55 depth=23 -4.72 b1a2 Nodes: 126098655 NPS: 349817 Time: 00:06:00.47 depth=24 +0.00 b1a2 a7a6 a2a3 a6a5 a3b3 b7b5 b3a2 a5a4 a2a3 c7c5 a3a2 c5c4 a2b2 b5b4 b2b1 a4a3 b1a2 c4c3 a2b3 c3c2 b3c2 a3a2 c2b2 b4b3 b2a1 b3b2 a1b2 a2a1q b2a1 Nodes: 136298420 NPS: 348580 Time: 00:06:31.01 depth=25 +0.00 b1a2 a7a6 a2a3 a6a5 a3b3 b7b5 b3a2 a5a4 a2a3 c7c5 a3a2 c5c4 a2b2 b5b4 b2b1 a4a3 b1a2 c4c3 a2b3 c3c2 b3c2 a3a2 c2b2 b4b3 b2a1 b3b2 a1b2 a2a1q b2a1 Nodes: 209511068 NPS: 353027 Time: 00:09:53.47 Uri
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