Computer Chess Club Archives




Subject: Re: Book design

Author: Sune Fischer

Date: 01:42:26 11/28/02

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On November 28, 2002 at 04:36:59, David Rasmussen wrote:

>On November 28, 2002 at 04:23:15, Sune Fischer wrote:
>>My present book format is really simple, too simple.
>>I would like to use transpositions and book learning, so I need a new format.
>>Is there a "standard" way of doing this, some well known technique which
>>includes statistics for each line and makes it possible to transpose back into
>>the book?
>>I can only think of primitive ideas, like storing the full FEN and append each
>>possible move reply to it. That will of course blow the book to a huge file. I
>>guess some other hashing scheme can be done, but what is the _best_ way? :)
>If you use zobrist hash keys (which you already have, if you have traditional
>hashing), transpositions are dealt with automatically. There are other issues to
>deal with, but hash keys will get you started.

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.



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