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Subject: Re: Book design

Author: Sune Fischer

Date: 02:02:14 11/28/02

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On November 28, 2002 at 04:55:39, David Rasmussen wrote:

>On November 28, 2002 at 04:42:26, Sune Fischer wrote:
>>True, but my gut feeling is that storing 8 bytes per position (plus their moves)
>>still makes quite a large book? I guess 6-7 bytes will be enough though.
>First of all, you don't store their moves, exactly because hashing takes care of
>transpositions. If you want the positions following some moves in a certain
>position to be in your book, you put book entries with _their_ hash keys in the
>For a simple book, storing just the hash keys and nothing else will suffice.

You are right, if you instead probe the book for each of the legal moves that
should do it.

> If
>you want to generate large books automatically from pgn files, you want to have
>some control over which positions make it to the book and which do not, and also
>which positions in the book, you actually want to reach and which you do not. So
>you'll have to store information about how many times white won, drew or lost
>from the current position etc.

Thought about this, but pgn's are written in SAN, little hard to read, also one
of the main reasons i haven't built a epd rutine. It's all on the to-do list of



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