Author: Will Singleton
Date: 07:04:32 11/03/03
Go up one level in this thread
On November 03, 2003 at 02:35:09, Gerd Isenberg wrote: >On November 03, 2003 at 02:33:02, Gerd Isenberg wrote: > >>On November 02, 2003 at 17:12:38, Will Singleton wrote: >> >>>On November 02, 2003 at 16:52:49, Gerd Isenberg wrote: >>> >>>><snip> >>>>>In the same vein, the following position has always been a nightmare for Tiger: >>>>> >>>>>[D]8/1KP5/3q2k1/8/6p1/8/8/8 b - - >>>>> >>>>>This position comes from a real game between the Modular Game System Sargon 2.5 >>>>>and Mike III, played in September 1980 during the Personal Computer World Fair. >>>>>Mike III continued the game with a long series of checks leading to a draw. >>>>> >>>>>Chess Tiger is not smarter than Mike III here. It is something that I had fixed >>>>>in the 16 bits version, to the expense of some added complexity in the passed >>>>>pawns evaluation code. I have not transfered this code to the 32 bits version >>>>>because it was not general enough (add another black pawn and the code did not >>>>>work). >>>>> >>>>>I am interested in results of other (amateur and commercial) programs. >>>>> >>>>> >>>>> >>>>> Christophe >>>> >>>>Hi Christophe, >>>> >>>>IsiChess on AMD XP2.6+ first shuffles around with Qb4+, Qxc7 and Qd7. >>>>After 5 seconds at depth 13 Qxc7 came up. Mate in 14 resp. 12 after one minute >>>>and 1:10. I guess a matter of won KPK eval. >>>> >>>>Cheers, >>>>Gerd >>> >>>Sure, but I'm not sure CT was referring to finding the mate as the problem. CT >>>seems to have some problem understanding that KQK is better than KQKP, that's >>>all I can figure. >>> >>>Will >> >you mean won KPK against KQPKP? I use interior node recognizers and assign >shlightly more than queen advantage in won KPK. Additionaly there is a >heuristic, that reduces score a bit (e.g. abs(delta material) / X) if a lot of >checks occur with "no progress". > ^^^^ >Gerd I do that too, but it's constrained to several consecutive checks that don't reset the fifty-move counter. Seems to help in some positions, but I'm not sure how generally effective it is. Will
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