Author: Peter McKenzie
Date: 20:54:44 11/14/99
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On November 14, 1999 at 22:58:19, James Robertson wrote: >On November 14, 1999 at 22:16:33, Will Singleton wrote: > >>On November 14, 1999 at 21:45:26, William Bryant wrote: >> >>>I recently found that my null threashold is set to low, and I am experimenting >>>with different level. >>> >>>I am curious what other people have found works for them. >>> >>>Do you count pieces or pieces and pawns? >>> >>>How may pieces or pieces and pawns must be present for the side on move >>>to allow a null move? Latest ICCA journal has an article by Ernst Heinz (Darkthought) about 'Adaptive Nullmove Pruning'. Basically he uses R=3 near the root, and R=2 for the last 6 plies. He seems to think this is a good practical combination (reduces nodes, doesn't make too many tactical mistakes) and does some experiments to suggest it is better that straight R=2 or R=3. cheers, Peter >>> >>>Thanks in advance. >>> >>>William >>>wbryant@ix.netcom.com >> >>I originally had a threshold of around 3 pieces per side, but now I allow >>endgames as long as someone has a piece. This is further modified by a >>blocked-pawn term, which disallows null if most pawns are blocked. I think. >>So, I don't detect zug like some others attempt to do. >> >>I only use R=2, but I know others alternate between 2 and 3 depending on the >>situation. >> >>Will > >What are the advantages/disadvantages of alternating between R=2/3? Does having >some entries with R=3 cause problems with the hash table? > >James
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