Computer Chess Club Archives




Subject: Re: Knowledge

Author: Daniel Shawul

Date: 23:34:11 09/26/04

Go up one level in this thread

On September 27, 2004 at 02:17:24, Uri Blass wrote:

>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.

      ok i see Rook < 2 minors. Anyway i think what he said can also be applied
for rook pawn ending too.

>>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)
>						score-=60;
>					else
>						score+=60;
>				}
     But you don't give a draw (0) score here. And what sergie is talking
about is giving a 0 score. I did and it lost against movie_178 on rook pawn
ending which doesn't.

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