Author: leonid
Date: 18:18:47 07/20/01
Go up one level in this thread
On July 20, 2001 at 07:57:59, Heiner Marxen wrote: >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 Hi, Heiner! Now I see only 9 move as not certain minimum number for this position. Mine found mate by selective in 10 moves in 19 sec. Celeron 600. No hash. I am not sure at what depth previous program found its mate. I tried to figure out by counting the plys but had impression that 15 of them were indicated. If I looked something in a wrong way and program found mate in 9, then this is the mate in 9. Brute force was perfect disaster for my program. Between 4 and 5 moves it was almost 53. 5 moves search took already 26 min and 22 sec to say no. I stopped my search right there. On this position my solver looked to me just like "professional" one. Cheers, Leonid.
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