Computer Chess Club Archives




Subject: Re: Knowledge

Author: Uri Blass

Date: 23:17:24 09/26/04

Go up one level in this thread

On September 27, 2004 at 01:58:56, Daniel Shawul wrote:

>On September 26, 2004 at 00:17:07, Sergei S. Markoff wrote:
>>There are a lot of positions with total 1 pawn on the board and equal piece sets
>>of both sides. If weaker side have 2 or more minors or (majors&&minors) then the
>>position is drawn in most cases. You must also use king position analysis to
>>improve this knowledge.
>>The same to 1 pawn vs 2 pawns with no passers.
>>This knowledge not help a lot, but after 2 weeks I make a version of ST which is
>>a little stronger than w/o this knowledge.
>>I need your results to compare.
>same thing here.Mine also is better without the RPKRK evaluator.

Sergei did not talk about KRPKR evaluator so I do not understand what you mean
by same thing.

>After seeing my engine loose agaisnt Movie (whit i think doesn't have this fn) ,
>I disable the evalator and just scale down the normal score by 1/2.
>Ditto for queen pawn ending, and opposite color bishop  ending.

I have no special evaluator for KRP vs KR

I do similiar thing to dividing the score by 2 when there is a single pawn in
the board and when both side have equal material except the pawn I simply reduce
the score of the better side.

Here is the relevant code from movei
score is the score from white point of view.

if (numpawns[LIGHT]+numpawns[DARK]==1)
				if (valpieces[LIGHT]==valpieces[DARK])
					if (numpawns[LIGHT]==1)


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