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Subject: Re: opening book files

Author: John Coffey

Date: 13:55:12 09/29/98

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Early last year I wrote an opening "database."  It was a tree
structure where each node stored the location of the next move
and the next alternative move.  Also stored at each node was
the number of games that move had been played and the number
of wins times 2 (to allow for draws.)  The structure took 20
bytes for each node, and the database was based on one million
games (up to move 24) and took a total of 600 megs.  I burned it onto a CD
and still use it in my own opening study.

I can see a transposition table having an advantage in that
it could take less space, although some comercial databases use
40 to 80 bytes per node.

I could see a transposition table having a disadvantage of that
it would require more disk-access.  This is especially bad if
the opening database is on CD.

john coffey



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