Author: A. Cozzie
Date: 15:11:23 09/03/05
Go up one level in this thread
On September 03, 2005 at 18:06:05, Robert Hyatt wrote: >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".. Probably not well known to him, Bob :) If you do the book purely based on position you can get problems like this example (the program being black) 1. e4 e5 2. Bb5 a6 3 Nf3 Nc6?? anthony
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