Computer Chess Club Archives




Subject: Re: Knowledge

Author: Uri Blass

Date: 00:10:49 09/27/04

Go up one level in this thread

On September 27, 2004 at 02:34:11, Daniel Shawul wrote:

>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.

Of course

I do not give draw scores unless it is clear that it is a draw or I evaluate the
chances as equal.


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