Author: Tord Romstad
Date: 15:25:54 01/21/04
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On January 21, 2004 at 14:59:23, Robert Hyatt wrote: >On January 21, 2004 at 12:45:59, Tord Romstad wrote: > >>On January 21, 2004 at 05:02:37, Robert Allgeuer wrote: >> >>>Do I conclude correctly that futilty pruning is off? Is there a specific reason >>>for that? >> >>Possibly that it simply doesn't work very well? The idea has always looked >>dubious to me, and my own experiments confirm this. There is a speedup, but >>it is not worth the risks. >> >>As always, the results may vary from engine to engine, but I suppose Bob has >>found that it doesn't work for him either. >> >>Tord > > >Correct. I didn't like it myself after lots of testing. It looks good on >test sets, but you don't win games by doing well on test sets. That's precisely what I found, too. In general I am very sceptical about pruning schemes which prune moves before they are made. At that time, we simply don't know enough about the moves to be able to prune safely. I do some fairly aggressive forward pruning in my engine, but I always prune after the move has been made and the resulting position has been evaluated. This is of course more expensive, but also much less risky. Tord
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