Computer Chess Club Archives


Search

Terms

Messages

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

Author: Dezhi Zhao

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

Go up one level in this thread


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.



This page took 0.03 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.