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Subject: Re: Number of positions in chess

Author: Álvaro Begué

Date: 20:44:31 01/02/06

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On January 02, 2006 at 15:16:08, Greg Simpson wrote:

>So is it possible to store the results for 2^157 positions?  For win/lose/draw
>we need 1.58 bits per position.

Actually, you can do much better than that. If you do a quiescence search with
some reasonable evaluation function (say, material difference) and the result is
that white is up 9 pawns, the fact that this position is won for white carries
far less than 1.58 bits, and a good representation could know about this.




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