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Subject: Re: Crafty Book Implementation

Author: J. Wesley Cleveland

Date: 14:44:55 06/11/01

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On June 11, 2001 at 14:17:37, David Rasmussen wrote:

>Am I an idiot, or does that Crafty book scheme miss some transpositions, because
>of it's clustering system? Wait, those two statements aren't mutually
>exclusive...
>
>When some of the upper bits of the book hashkey, is from the parent position,
>doesn't that mean that if I'm in an unknown position, that can make a move that
>transposes into a book position, it won't, because the upper bits will only
>match the actual parent position(s) from when the book was created?

Right, the only transpositions crafty finds are those that have been played in
the pgn the book was created from. This prevents crafty from making stupid
transpositions, e.g. e4 e5 Nf3 Nc6 Ng1 Nb8??



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