Author: Richard Pijl
Date: 07:57:21 04/08/03
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On April 08, 2003 at 10:04:02, Uri Blass wrote: >[D]8/5pp1/4p1kp/1Q6/2rqP2P/8/5PP1/5RK1 w - - 0 27 > >This position happened in a game of movei. >For the game see http://f11.parsimony.net/forum16635/messages/46511.htm > >I found that latest movei also suffers from the same evaluation problem. > >Movei evaluates the position as almost equal. > >I found that Crafty and a lot of programs understand that black has a clear >advantage(more than 0.5 pawns for black from the >first iterations). > >I understand that black is better but the question is what factor in evaluation >helps a lot of programs to understand it. > >I can explain reasons to give advantage for black from program point of view: > >1)The black king is more advanced and it is known that the king should >be at the last rank except endgames. I don't agree. After h5+ the black king is locked out from the immediate action and has to retreat to h7. >2)The white pawns are more advanced so by piece square table they >get bigger bonus after a move like h5+. But that would increase the white score? I think you can detect black's advantage with three eval terms: - Limited mobility of the white rook. It cannot leave square f1 because of immediate threats on f2. - Black has two attacking pieces, White only one. - Black has easy access to the 2nd row, increasing pressure on the white king position. Richard.
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