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Subject: Re: Dr. Hyatt, have you decided to keep the VR change in Crafty?

Author: Dezhi Zhao

Date: 13:28:09 12/18/02

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I read some days ago you experimented the verified null move idea with Crafty
and some encouraging results. However, have you decided to keep the change?

I think the VR=3 search is more akin to R=3 search in the long run. This idea
seems to me is that you verify with reduced depth a likely cut node that was
detected by a fast R=3 null move search. Though cheap screening (R=3) and
expensive verification (reduced depth search) sounds a reasonable trade-off, all
the sub-nodes of the verfication are still searched by using the less-reliable
R=3 again.  The verification could fail the same way as standard R=3 to some
less extent. I think the validation process of the verified null move
in a real program like Crafty could be lengthy.

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