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Subject: Re: An MTD(f) question about NULL MOVE searching

Author: Aivaras Juzvikas

Date: 06:07:15 07/16/04

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On July 16, 2004 at 08:55:50, Fabien Letouzey wrote:

>On July 16, 2004 at 08:39:41, Aivaras Juzvikas wrote:
>>that sounds logical, however have you tested this in the games? for me the
>>version with nullmoves allowed in pv nodes plays better..
>Let's make sure we are talking about the same thing before proceeding further.
>I was talking about (actually against) allowing null move in the PV, which is
>not the same as "at PV nodes".  In the PV means *inside* of the alpha-beta
>window (exact score).
>You sound like you might be talking about whether or not to try null move at PV
>nodes, which is a different topic (and only used for fail high, which means the
>node is not in the PV after all).
>I don't know of any PVS-like engine (or alpha-beta based for that matter) which
>allows null move in the PV.

as i understand a node is a pv node if beta != alpha + 1

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