Author: Robert Hyatt
Date: 15:06:05 09/03/05
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On September 03, 2005 at 17:05:36, Kevin K wrote: >Hello, Dr. Hyatt. > >1 d2-d4 d7-d5 2 e2-d4 >1 e2-d4 d7-d5 2 d2-d4 > >These two moves are considered the same in transposition table, >because resulting positions are the same. >But, what about in book database? >As far as I know, Crafty does not consider these the same positions in book. >Why not? >For example, if I have only 1 d2-d4 d7-d5 2 e2-d4 e7-e6 in book and >if I play 1 e2-d4 d7-d5 2 d2-d4, Crafty does not find next move(e7-e6) >from book even though two positions are the same. > >Thank you. A book position is based on the parent position and the child position. That is, the position before the move and the position after the book. This was done to avoid a well-known transposition "bug"..
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