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Subject: Re: What is Botvinnik-Markov extension?

Author: Tord Romstad

Date: 03:42:27 10/27/05

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On October 26, 2005 at 19:45:18, Maurizio Monge wrote:

>Thanks for your detailed anwer, Tord.
>So, if i understood correctly, the extension is activated
>when the null move fails because of a strong reply and the
>reply is still avalable for the other player after 2 plys.

Yes, exactly.

>It means that, to be able to do this, it is no more enough
>to do the null move search with a zero window (-beta,-beta+1),
>like my experimental program do at the moment (Fruit 2.1
>does this too), because this way you could miss the strong
>reply...

You can use the extension even with zero window null move
searches (in fact I have never used anything else than zero
windows myself), although of course it will trigger less
often then.

Tord



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