Author: Will Singleton
Date: 18:48:34 06/28/03
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On June 28, 2003 at 15:34:04, Rémi Coulom wrote: >On June 28, 2003 at 12:03:01, Will Singleton wrote: > >>On June 28, 2003 at 11:20:21, Frederic Louguet wrote: >> >>>I read an interesting paper from Albert Xin Jiang and Michael Buro about >>>Multi-ProbCut and its implementation in Crafty. I have always been very >>>skeptical about this pruning technique (for chess) but the paper is rather >>>optimistic. However, the data presented does not seem very convincing from a >>>statistical point of view (too few games, not enough opponents). So could Robert >>>Hyatt tell us a little more about the effectiveness of this technique ? Does it >>>_really_ work ? >> >>I don't know about crafty, but I can tell you my experience. After messing with >>the values of cutoffs(c), moves(m) and reduction(r), I use c=2, m=8, and r=3/4, >>depending on depth. Increasing m (number of moves to probe to try to get >>cutoffs) slows you down and doesn't help accuracy very much, and any value >>greater than 2 for c caused all kinds of unnecessary searching. >> >>I found it helps slightly in many cases, and has no effect or is slightly worse >>in others. I didn't quantify it, but I didn't get quite the results the authors >>did. But since it didn't seem to hurt, I left it in. >> >>Will > >I think you are confusing Multi-ProbCut with Yngvi Björnsson's Multi-Cut, which >is very different. > >Rémi Oops, that's what I get for doing it from memory. Will
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