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Subject: Re: MTD(f)

Author: Dieter Buerssner

Date: 12:09:58 06/17/05

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On June 17, 2005 at 14:29:39, rasjid chan wrote:

>"Yace for example stores a best move in HT even when failing low"
>I presumed the best move here is the max of fail-low(UB)scores <=alpha.

Correct. And as you are probably aware, in fail hard search, all those scores
will be == alpha.

>Depending on greater UB for move ordering may not be correct.
>Crafty uses node count for ordering at root.
>What about using node count also for best move in fail-low?

Might be a good idea - one would have to try. Vincent just mentioned something
that suggests the contrary, however.

In my engine, I unfortunately still use 32 bit node counters. With long analysis
they can overflow. I would not like to depend on them for move ordering.

Regards,
Dieter



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