Author: Gerd Isenberg
Date: 23:35:09 11/02/03
Go up one level in this thread
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
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