Author: Uri Blass
Date: 07:10:41 07/23/01
Go up one level in this thread
On July 23, 2001 at 09:50:27, Heiner Marxen wrote: >On July 23, 2001 at 02:25:50, Uri Blass wrote: > >>On July 22, 2001 at 22:44:46, Heiner Marxen wrote: >> >>>On July 21, 2001 at 15:02:43, Uri Blass wrote: >>> >>>4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acn 718366; acs 8; bm e4; ce 32756; dm 6; >>>pv e4 Kf8 Qg4 Ke8 Qg7 Kd8 Bb5 Kc8 Bc6 Kd8 Qd7#; >> >>Here chest is faster than chessmaster in finding the shortest mate. > >:-) > >>chessmaster6000 cannot see mate in 6 even after some minutes because of null >>move pruning unless I asked it to search for mate in 6. >> >>The problematic line from chessmaster's point of view is: >>1.e4 Kd7 2.Qg4+ Kc7 3.Qg7+ Kc6 4.d4 Kb6 5.Qd7 when black is in zunzwang. >> >>Usually chessmaster is faster than chest in finding the shortest mate but it >>does not know that the mate that it found is the shortest mate. > >Yes, and this is what makes Chest slow, most of the time: proving that all >those shorter mates do not exist. > >>I guess that the times of chest in every problem is for finding all the >>solutions and in this case chessmaster has a clear advantage because it is happy >>with finding 1 solution. > >Normally (for Chest that is with composed chess problems with just one >solution) this is not a big thing. The average solution time would reduced >by a factor of 2, or even less, since the non-solution moves often are >significantly faster to compute. > >Here, where we have 2 or sometimes even 5 solution moves, it could be a >factor of 4. That would change the times significantly. >OTOH, it is nice to know all solutions as a reference point. Yes Chessmaster6000 had no error in the first move > >>Chessmaster results in finding the shortest mate in the same problems in >>comparison to chest: >> >>-, 8 >>4, 190 >>2, 180 >>2, 129 >>13, 141 >>4, 157 >>17, 128 >>6, 182 >>2, 182 >>52, 250 >>25, 203 >>108,278 >>125,178 >>- ,186 >>24 ,216 >>6, 291 >>38, 197 >>87, 179 >>5, 230 >>25, 213 >>19, 200 >>103,357 >>71 ,324 > >Thanks for the info! >That doesn't look bad for Chest. What CPU/memory did you use for Chessmaster? PIII850(128 Mbytes hash tables) > > >>Chessmaster also found mate in 8 in all the other problems that were posted >>except one >> >>[D]4k3/pp2p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1 > >That one is still busy computing :-) Chessmaster's results e3 13 seconds: mate in 13 e3 17 seconds: mate in 11 e3 61 seconds: mate in 9 Regards,Uri
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