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

Author: Fabien Letouzey

Date: 05:55:50 07/16/04

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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.

Fabien.




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