Author: Peter Fendrich
Date: 14:05:15 01/23/03
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On January 23, 2003 at 16:54:40, Ulrich Tuerke wrote: >> >>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 There is an old ICCA Journal article, showing these butterfly patterns. I can't recall which one... /Peter
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