Author: Robert Hyatt
Date: 22:31:06 11/28/02
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On November 29, 2002 at 00:28:47, Uri Blass wrote: >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? :) >>> >>>-S. >> >> >> >> >>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... > >No > >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. > >Uri Several ways to solve that. 1. Do a search before playing a book move; 2. do as I do and use part of the "before" hash signature and part of the "after" hash signature, so that you won't transpose as you suggest...
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