Author: Roy Eassa
Date: 10:26:24 01/16/02
Go up one level in this thread
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%. I had the exact same thought some time ago. But I figured the "ingredients" in determining the value are the same either way. There should be a simple way to convert from one to the other. E.g., a table something like this might do the trick: Pawns ahead % Chance to Win ----------- --------------- 0.0 50 0.1 51 0.2 52 0.3 53 0.4 54 0.5 55 0.6 56 0.7 57 0.8 58 0.9 59 1.0 60 1.5 66 2.0 77 3.0 88 5.0 99 Then the program could just show whichever value the user prefers. (Of course, the probabilities I used above are off the cuff, but they seem reasonable to me at first glance.)
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