Author: Dennis Breuker
Date: 03:35:17 01/24/03
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On January 23, 2003 at 17:05:15, Peter Fendrich wrote: >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 Hartmann, D. (1988). Butterfly Boards. ICCA Journal, Vol. 11, Nos. 2/3, pp. 64-71. Dennis
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