Author: Herman Hesse
Date: 10:18:39 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. But how to relate to evaluation in any position ? To give the opponent the move, as black gives white at the start game, -0.20, then white moves (e4, d4, Nf3 ....), and gives black the move, implies the worst white move (g4?) is incremental worth -0.40 (to give black +0.20), and each of the best white moves should be incremental +0.40. Easy at the start position as historical data exists in profusion. Then how to evaluate winning percentage instead of usual polynomial after that? Herman > >Amir
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