Author: Tord Romstad
Date: 02:15:57 08/27/05
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On August 26, 2005 at 23:11:18, Robert Hyatt wrote: >Most don't do history like that. Usually it is just a 12 bit index <from><to>. >So it doesn't differentiate between a king move from f6 go g7, and a >bishop/queen move from f6 to g7... There is no reason you have to use the same history table for move ordering and reduction. I have two tables. The table used for move ordering is similar to what you describe. It is indexed by the from and to squares, and the entries are incremented by the remaining depth when a move causes a beta cutoff. The table used for reductions is indexed by the moving piece type and the destination square, and for each move I count the number of times it has been tried and the number of times it has produced a cutoff. Tord
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