Computer Chess Club Archives




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

Author: Vasik Rajlich

Date: 06:21:12 07/16/04

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On July 16, 2004 at 09:13:07, Fabien Letouzey wrote:

>On July 16, 2004 at 09:07:15, Aivaras Juzvikas wrote:
>>as i understand a node is a pv node if beta != alpha + 1
>Yes, but a PV node does not necessarily end up in the PV (e.g. fail high).
>Therefore "PV node" and "PV" are different concepts.
>I think Vasik was talking about null moves in the PV, and I gave my opinion
>about this topic.  Maybe I misunderstood his post though.

I am not sure I understand this distinction. Do you mean that PV node is a node
which you score between alpha and beta, and PV is the variation which eventually
emerges? (Ie pv nodes can be "overwritten")


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