Author: David Rasmussen
Date: 02:56:27 06/12/01
Go up one level in this thread
On June 11, 2001 at 20:52:07, Robert Hyatt wrote: >>I see now. That is of course a problem. But it would still be nicer, if this was >>somehow prevented, so one could take full advantage of the opening knowledge in >>the book. This would allow one to make transpositions into book positions from >>non-book positions. > > >It can do this. What my current book logic requires is that the previous >position must be a legitimate book position that is followed by the current >book position (to allow the transposition.) If this fails, crafty will have >to search normally. But if It then finds a move that returns it to a book >position, all will be ok as it will then transpose in for its "next" search >since this and that position are known book positions. I know, but then you make the transposition "unintentionally" by search. I think a scheme where a positions doesn't depend on it's parent position is nicer, as the engine can use the book knowledge also in the case I mention. I don't really see how the "going back" in the book, can be a problem, as long as one checks during book move selection, that this move doesn't get one back in a position that the game has already been in, that is, repetition check the book moves.
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