Computer Chess Club Archives


Search

Terms

Messages

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

Author: Tord Romstad

Date: 11:01:52 10/01/03

Go up one level in this thread


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



This page took 0.32 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.