Author: Uri Blass
Date: 17:07:03 04/08/03
Go up one level in this thread
On April 08, 2003 at 19:49:51, Uri Blass wrote: >On April 08, 2003 at 19:30:24, Robin Smith wrote: > >>The following position is a rather trivial (for a human) perpetual check. Why >>does it take some programs so long to see it? Many of today's top programs >>think White is winning, and after long searches too! Which program detects >>perpetual and returns a draw score the fastest? >> >>Tiviakov,S - Tseshkovsky,V >>Kropotkin, 1995 >>[D] 6k1/7p/4Q1p1/3pP1P1/p6q/Pp1r2R1/1P5P/7K b - - 0 1 >> >>Robin > >Draw score is hard to see for movei but on P850 it stops to believe that it is >an easy win for white after some minutes. > >depth=9 -1.27 g8f8 e6f6 f8g8 f6d8 g8g7 d8e7 g7g8 e7e8 g8g7 e8d7 g7g8 d7c8 g8g7 >c8b7 g7h8 b7a8 h8g7 a8a7 g7g8 a7b8 g8g7 b8c7 g7g8 >Nodes: 29733541 NPS: 173343 >Time: 00:02:51.53 >depth=10 -1.04 g8f8 e6d6 f8g8 d6d8 g8g7 d8e7 g7g8 e7e8 g8g7 e8d7 g7g8 d7c8 g8g7 >c8c7 g7f8 c7b8 f8g7 b8b7 g7h8 b7a8 h8g7 a8a7 g7g8 g3d3 h4e4 h1g1 e4d3 a7a4 >Nodes: 53504916 NPS: 176380 >Time: 00:05:03.35 >depth=10 -1.03 g8h8 >Nodes: 59270785 NPS: 177165 >Time: 00:05:34.55 >depth=10 -0.89 g8h8 e6e8 h8g7 e8e7 g7g8 e7d8 g8g7 d8c7 g7g8 c7b8 g8g7 b8a7 g7g8 >a7a8 g8g7 a8b7 g7h8 b7c8 h8g7 c8d7 g7f8 g3d3 h4e1 h1g2 e1e2 g2g1 e2d3 d7a4 >Nodes: 65994980 NPS: 177611 >Time: 00:06:11.57 >depth=10 -0.89 g8h8 e6e8 h8g7 e8e7 g7g8 e7d8 g8g7 d8c7 g7g8 c7b8 g8g7 b8a7 g7g8 >a7a8 g8g7 a8b7 g7h8 b7c8 h8g7 c8d7 g7f8 g3d3 h4e1 h1g2 e1e2 g2g1 e2d3 d7a4 >Nodes: 71765548 NPS: 177769 >Time: 00:06:43.70 >depth=11 -1.02 g8h8 e6e8 h8g7 e8d7 g7g8 d7c8 g8g7 c8b7 g7h8 b7b8 h8g7 b8c7 g7g8 >c7d8 g8g7 d8f6 g7g8 g3d3 h4e1 h1g2 e1e2 g2g1 e2d3 f6d8 g8g7 d8d7 g7f8 d7a4 >Nodes: 94257881 NPS: 178854 >Time: 00:08:47.01 > >Uri Maybe not good enough for you but almost 0.00 depth=11 -0.33 g8g7 e6e7 g7g8 e7e8 g8g7 e8d7 g7g8 d7c8 g8g7 c8b7 g7g8 b7a8 g8g7 a8a7 g7g8 a7b8 g8g7 b8c7 g7g8 c7d8 g8g7 d8f6 g7g8 g3d3 h4e1 h1g2 e1e2 g2g3 e2d3 g3f4 Nodes: 236071122 NPS: 177501 Time: 00:22:09.97 Uri
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