Author: Chris Carson
Date: 05:25:58 07/29/99
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On July 29, 1999 at 07:16:32, Amir Ban wrote: >On July 28, 1999 at 18:16:24, Dann Corbit wrote: > >>On July 28, 1999 at 17:50:51, Kristo Miettinen wrote: >> >>>The position is the opening array, all pieces in their initial positions. The >>>explanation about the eight pawns makes sense, intending to steer Crafty into >>>open waters (on the assumption that the opponent is human?) >>> >>>I was looking into this on a whim, as I use the advantage of White in the >>>opening position as my quantum of positional value (on which scale the value of >>>a pawn is 6 quanta for me). >>Here is the C.A.P. record for that position. >> >>rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - acd 15; ce -7; pv e4 e6 Nf3 >>Bb4 Nc3 Ne7 Bc4 Nbc6 O-O O-O d4 Bxc3 bxc3 Na5 Bb5; pm e4; id "C.A.P. 4028"; >> >>I bet you never knew crafty was French. >> >>Crafty thinks it is behind by 7 one hundredths of a pawn. This is obviously >>conservative because white has a tempo at least. But I don't think that it is >>grossly inaccurate. > >A correct evaluation is one that matches the winning percentages of the >position. I think white has about 54% in serious play, and if so the evaluation >should be about +0.20. > >Amir Amir, Interesting point. If I read you correctly, the "Evaluation" should match the winning changes. This is not the way most programs "Evaluate" a position. Granted that a higher "Eval" by a program should mean a higher "Chance" to win, it is normally not a "Percentage" based on results. I have thought that this might be a better method of "Evaluation", some programs do use a "Percentage" (Crafty) for opening book moves, but not for middle game or end game positions. Any thoughts on how to incorporate "Percentage" into the "Evaluate" function of a program (knowledge)? Perhaps a "Percentage" "Evaluation" for positions and endgames as a part of the learning (Crafty might be able to do this) would be useful. Any comments? Best Regards, Chris Carson
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