Author: Frank Phillips
Date: 02:22:52 08/05/01
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On August 05, 2001 at 05:02:58, Tony Werten wrote: >Hi all, > >Glad I took this bug finally out. By scoring passed pawns, I don't count the >rank of the pawn, but the row. Never noticed this bug before. > >The longer I program, the more I get amazed by the fact that XiniX has ever won >any games. (Yes, even by creating passed pawns) This passed pawn stuff is >actually one of the oldest code in my program. > >Funny thing, the score on testsuites stays about equal. Yes it solves all the >endgames faster now, but it misses some tactical positions. The reason is that >in some of them you have to start a king attack, by destroing the opponents pawn >protection. This would create pased pawns on the kingside, only on second or >third rank, but on 7th or 8th row, wich was what I was scoring in my old code. > >cheers, > >Tony Tony I am constantly amazed how well my thing plays despite the bugs and whatever half-baked, untuned evaluation parameters I have. I found shortly after CCT3 it played without the queen square positional table term (stick the queen in the middle of the board) in the evaluation. I must have removed it inadvertantly at some time. After CCT3 I put mobility terms in trying to persuade the queen not to hide in the corners or on the edge, which is when I noticed.......... Maybe we are the only ones who make such mistakes ;-) Frank
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