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

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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