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Subject: So how do we tell when to avoid null-move?

Author: David Eppstein

Date: 09:39:20 11/05/99

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This and the many other null-move-killer positions regularly posted here seem to
show that crafty's simplistic check (avoid null move when side to move has only
one non-queen piece) could stand some improvement.  What better algorithms are
other programs using to tell when a position might be zugzwang?  I vaguely
remember a commercial programmer (Christophe or Ed?) making a cryptic comment
about double-null-move solving this problem, but I didn't understand what that
might mean.



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