Author: Ulrich Tuerke
Date: 13:54:40 01/23/03
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> >Can you explain again, where the name "butterfly table" comes from? > Hello Gerd, my refutation table looks like this struct RefEntry RefTab[2][64][64]; Ignoring the 1st index (the color), the refutation table is indexed by "from" and "to" squares of the preceeding move. If you draw from and to in a coordinate system as x- and y -axes, and you fill in the "from" and "to" combinations, which correspond to legal moves, then you get some pattern, reminding on the wings of a butterfly. This is at least what the authors have said (iirc). I myself have never been curious enough to try. Uli
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