Author: Tord Romstad
Date: 11:01:52 10/01/03
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On October 01, 2003 at 13:50:49, Robert Hyatt wrote: > >It seems to me that Chrilly's paper on null-move search included this >idea as the "threat extension". It is not the same. The "deep search extension" (the term Chrilly used, IIRC) extends in all positions where the null move fails low by a sufficiently high margin, as you explain. The Botvinnik-Markoff extension is different. It extends when the null move fails low at ply n _for the same reason_ as the null move failed low at ply n-2. I have never seen this idea before. It seems original and interesting. Tord
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