Author: Peter McKenzie
Date: 12:25:58 10/01/03
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On October 01, 2003 at 14:01:52, Tord Romstad wrote: >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. Agreed > >Tord
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