Author: J. Wesley Cleveland
Date: 18:21:57 01/16/02
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On January 16, 2002 at 07:41:28, Graham Laight wrote: >It has occurred to me that it is wrong to evaluate a position in terms of >relative pawns (the "de facto" standard - whereby an evaluation of 2 means that >you're approximately the equivalent of 2 pawns ahead). > >This means that many aspects of evaluation have to be squeezed into a dimension >which is not appropriate at all. > >A better way would be to evaluate "winning probability". If a position was a >draw, the value would be 0.50 (or 50%). If the player should win 3 out of 4 >times, the eval should be 75%. If the player must win from here, then the >evaluation should be 100%. > >It seems strange when you think about it that all programmers have chosen to >adopt the traditional "pawn equivalence" standard. > >-g another advantage of using winning percentage and drawing percentage ia that you could use these to determine how deeply to search branches, e.g. if it is 99% draw, you would not need to search deeper, but if it is 30% win and 40% draw, you would want to search much deeper. Note that both of these would have about 0 pawn value.
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