Author: J. Wesley Cleveland
Date: 12:59:00 11/05/99
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On November 05, 1999 at 07:04:35, Antonio Dieguez wrote: >I just implemented recursive null-move, with a reduction of 2 plies. > >Obviusly a 1 ply reduction is safe enough, but 2, wich is the usual, for me >looks not so safe, for example trusting that a yours-mine instead a >mine-yours-mine-yours will give a minimum is a little optimistic isnt? and >anybody have done a test about the percent of mistakes of the null-move or >something? I mean when the score of the best move at the position, without >null-move, results worse than the result doing null-move. This is easy to test. Where you do your null-move, instead of doing a cutoff, just set a flag. When you return the real value, if it does not cause a cutoff, it is a null-move error. Count the null-move errors, and total null-moves, and get the percentage error. Another idea is to save the positions that cause errors, and analyze them to see what they have in common.
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