Author: Daniel Shawul
Date: 01:21:07 09/27/04
Go up one level in this thread
On September 27, 2004 at 03:10:49, Uri Blass wrote: >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. >>>> >>>>daniel >>> >>>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; >>> } >>> >>>Uri >> 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. >>daniel > >Of course > >I do not give draw scores unless it is clear that it is a draw or I evaluate the >chances as equal. > >Uri ofcourse i don't give 0 score for endings where one side has two pieces. Buf when only one piece exists,it is possible to recongize dead draw positions. I do for some rook pawn and queen pawn endings. For all other cases i reduce whatever score I get from my normal eval.
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