Author: Tord Romstad
Date: 11:15:08 10/26/05
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On October 26, 2005 at 13:10:45, Maurizio Monge wrote:
>Hi,
>I have found that 2 engines ("TRACE"
>and "Petir") use this extension.
SmarThink and Gothmog use them, too. The extension was
introduced by Sergei Markoff (author of SmarThink), and was
apparently inspired by some idea in an old paper of Botvinnik.
Sergei modestly named the extension "pseudo-Botvinnik
extension". I implemented them in Gothmog, noticed a
small, but clear improvement, and introduced the more
attractive name "Botvinnik-Markoff extension". :-)
>Does anyone know what it is?
Extending when the null move is refuted by the same move,
or by the capture of the same piece, two times in a row
(i.e. at ply N and at ply N+2). The point is to avoid horizon
effect problems, for instance when there is an unavoidable
mate or an unstoppable passed pawn, but the defending
side can postpone disaster for a few moves by delivering
checks.
Tord
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