Computer Chess Club Archives




Subject: Re: Book design

Author: Uri Blass

Date: 21:28:47 11/28/02

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On November 28, 2002 at 19:51:40, Robert Hyatt 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? :)
>Store the "hash signature" for a position.  If you can make a move and reach
>this hash signature, you know this is a book move...


It is possible that your opponent blundered and you have too possibilities:
1)play a move that leads to a forced mate.
2)Making a move that leads to a book position.

In this case you can make a move and reach the hash signature that you know but
the move is not good because  it gives you book position instead of checkmate.


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