Author: Heiner Marxen
Date: 04:18:33 07/22/01
Go up one level in this thread
On July 21, 2001 at 12:35:35, Gian-Carlo Pascutto wrote: >On July 21, 2001 at 04:39:07, leonid wrote: > >>Hi! >> >>Probably next position will be easy for every program. >> >>[D]knqb2Rq/qbq2Qq1/nq2Nr2/q2QQQ2/2NQQ3/1QrQ4/Rq4BB/q5QK w - - >> >>Please indicate your result. >> >>Thanks, >>Leonid. > >2.5 seconds > >Sjeng: prove > >Max time to search (s): 200000 > >P: 0 D: 100000000 N: 186965 S: 186964 Mem: 7.85M Iters: 2132 MaxDepth: 29 >Time : 2.500000 >This position is WON. >PV: e6c7 a6c7 d5b7 b6b7 d4a7 a5a7 e4b7 c8b7 g2b7 > > >-- >GCP For Chest to prove the shortest mate this is much harder: after 13.4 hours Chest says "No solution in 11 moves." (K7/600 with 350 MB hash) The EBF is not bad, but also not good enough: starting with depth=8 black has used up the easy checks, and the EBF doubles: 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 0.01s 1kN [ 8.23] 0.92 99- 0 # 4 0.10s [ 10.00] 4kN [ 5.22] 1.02 595- 0 # 5 0.47s [ 4.70] 19kN [ 4.21] 1.23 2521- 0 # 6 2.02s [ 4.30] 85kN [ 4.56] 1.46 10289- 0 # 7 8.82s [ 4.37] 417kN [ 4.91] 1.71 42237- 0 # 8 69.52s [ 7.88] 3568kN [ 8.56] 1.84 335095- 0 # 9 595.42s [ 8.56] 31094kN [ 8.72] 2.13 2951616- 802 # 10 4980.94s [ 8.37] 260558kN [ 8.38] 2.45 25194399- 16446522 # 11 48350.46s [ 9.71] 2531658kN [ 9.72] 2.62 242162073- 233414172 Depth=12 is estimated to need more than 5 days :-( So Chest quits here. Apparently, Chest needs a fast mate search mode to not frustrate its author so often :-) Cheers, Heiner
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