Author: Ryan B.
Date: 17:21:48 10/26/05
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Would this be a replacement for Mate Threat extension? It seems to me that it
would extend a lot of lines that are already extended and maybe some that have
been reduced. I do think this could help detect badly trapped pieces at the end
of a search. Now I wish I could remember my logic when I decided it was a good
idea to reduce some lines this would likely extend.
Ryan
On October 26, 2005 at 14:15:08, Tord Romstad wrote:
>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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