Author: Vincent Diepeveen
Date: 19:03:09 11/14/99
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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'm using a reduction factor of 3 in DIEP. >I am curious what other people have found works for them. > >Do you count pieces or pieces and pawns? For nullmove? >How may pieces or pieces and pawns must be present for the side on move >to allow a null move? My nullmove implementation is basically allowing doing a nullmove now if - king side to move is not in check - one of both sides is not in pawn endgame - last 2 consecutive moves were not nullmoves This last condition takes care you detect zugzwang too. If you add extra conditions that are only valid for one side then you already might not detect zugzwang anymore. So in fact i nearly always nullmove except if both sides are in the pawn endgame and side to move not in check. Simply always nullmove has a big advantage that you can detect threats in a consequent way and that you *always* try to reduce your tree first at the same time. >Thanks in advance. You're welcome, Vincent Diepeveen >William >wbryant@ix.netcom.com
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