Author: Tony Werten
Date: 23:43:34 11/03/03
Go up one level in this thread
On November 03, 2003 at 13:22:42, Christophe Theron wrote: >On November 03, 2003 at 10:04:32, Will Singleton wrote: > >>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 > > > >That's exactly what I have tried, with different values for X and the number of >consecutive checks needed to trigger it. > >It has always weakened my program. Not by much, but I expected a minor gain, not >a minor loss! Make sure your trigger is counted from the back, not the front. ( I don't want to make it too easy :) Tony > >I have seen Genius doing this for years, much to my despair... :( > >It seems right, intuitively, but I can't get it to work effectively. > > > > Christophe
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