Author: Uri Blass
Date: 16:49:51 04/08/03
Go up one level in this thread
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
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