Author: Heiner Marxen
Date: 04:57:59 07/20/01
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On July 19, 2001 at 09:39:46, Gian-Carlo Pascutto wrote: >On July 19, 2001 at 08:20:36, leonid wrote: > >>Hi! >> >>If you like, you can try this position: >> >>[D]rrqqqq1k/5q2/RRQQ1qqq/3Q3q/3QQQ1n/BQ3Q1n/BP3N1b/K4N1b w - - >> >>Please indicate your result. > >63.2 seconds on Athlon 1000 > >Sjeng: prove > >Max time to search (s): 20000 > >P: 0 D: 100000000 N: 3658466 S: 3658465 Mem: 153.52M Iters: 46218 MaxDepth: 29 >Time : 63.240000 >This position is WON. >PV: f4f6 g6f6 f3f6 h6f6 d5h5 f7h5 b3g8 f8g8 d4f6 d8f6 d6f6 g8g7 f6g7 h8g7 c6f6 > >-- >GCP In sharp contrast to the above result, the search for the shortest mate is much harder: after 10.2 hours (!) Chest says "No solution in 8 moves." depth time EBF[T] EBF[N] hash-speed # 1 0.00s 0kN 0.87 1- 0 # 2 0.00s 0kN 1.00 1- 0 # 3 0.16s 8kN [ 95.32] 0.99 111- 0 # 4 2.11s [ 13.19] 82kN [ 10.93] 1.25 5946- 0 # 5 25.41s [ 12.04] 1008kN [ 12.25] 1.58 90608- 0 # 6 253.41s [ 9.97] 10394kN [ 10.31] 1.96 946154- 0 # 7 2749.70s [ 10.85] 113463kN [ 10.92] 2.28 9993300- 1727617 # 8 36553.28s [ 13.29] 1530367kN [ 13.49] 2.37 134410086- 125662185 Since the EBF is above 13 and likely to increase for the next depth, I will not continue to go deeper with Chest. :-( (Done on a K7/600 with 350 MB hash) Have a nice day, Heiner
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