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Subject: Re: Book design

Author: scott farrell

Date: 06:45:19 11/28/02

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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? :)
>
>-S.
I have taken a different approach to most.

I actually run a largish relational database (mysql).

The db is a couple of hundred mbs, and the main index if about 60Mb, which I
tell mysql to hold in RAM. The db reacts pretty quickly during a game. They keys
are all based on zorbist keys, so I get transpositions etc. I am a commercial
programmer, so database coding is too easy, and doesnt require too much thought.

The idea being I can implement whatever sort of stats and learning etc, easily,
without too much coding. I have about 40 columns of data for each position of
about 6 million positions in my opening book. I have the win/loss/draw and avg
rating of each win/loss/draw, and have 2 brackets of win/loss/draw stats, 1
being those players where myrating>oprating-200, and then obviously the opposite
of that. Then I do a stupedenous amount of stats to select the move, my MYSQL
does all that for me .....

I also use SCID to manage a db games, and use SCID to query out the required
PGN, and have an import routine to read the SCID output PGN.

I strongly suggest you use SCID to query your game PGNs.

Scott



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