Author: Will Singleton
Date: 13:49:41 04/13/99
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On April 13, 1999 at 16:36:05, Hristo wrote: > >I played a game against crafty15_20 two nights ago. >Used craftys default settings, with no oppening book or >endgame databases. Without any board representation other >than "d" option on the command line. The computer is P II 450 >with 128 MRam. 180K N/sec > >Why didn't crafty see the mate after 26. ... Qe7 (under normal >conditions, i.e. 2-3min per move)?! How many other >programs don't see that mate? BTW after 26. ... Qe7 17. Qg4 f6 >crafty finds the mate in about 18 sec. >In analize mode it takes something like 30 min or more for crafty to >find that Qe7 leads to mate. > >At what point a program searches for mate instead of material gains? >(I have the crafty code but haven't spend the time to learn it.) > I can't speak for anyone else, but I kind of experimented with this. If certain conditions were present, I'd do a mate search for a finite time prior to the regular search. It would enable some pretty deep mates on occasion, but I dropped it. It just isn't that useful to find mates deeper that the regular search does, all things considered. Will
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