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Subject: Re: Crafty opening book question

Author: Robert Hyatt

Date: 14:36:26 10/01/01

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On October 01, 2001 at 16:55:21, Alvaro Jose Povoa Cardoso wrote:

>I know this question was probably made many times, but I wasn't listening :)
>Could someone please explain in detail the Crafty openings book binary format?
>Does it represent positions and not moves?
>
>Best regards,
>Alvaro Cardoso


Yes.  It is essentially hash signatures produced by making moves and then
updating the hash signature after each move and storing it.

It uses a cute "grouping" scheme so that all the signatures that share a
common "parent" position are lumped together in the book file so that one I/O
operation will read in all possible book moves for any position.



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