Computer Chess Club Archives




Subject: Re: The "same threat extension" as effective way to resolve horizon prob

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.


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