Computer Chess Club Archives




Subject: Re: PVS and MTD(f) branching factor

Author: Omid David Tabibi

Date: 16:33:42 06/17/03

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On June 17, 2003 at 19:00:23, Russell Reagan wrote:

>With perfect move ordering, alpha-beta has a branching factor of the square root
>of the min-max branching factor.

Assuming perfect move-ordering (and of course no forward pruning), yes.

>Is there any such formula for the branching
>factor of PVS or MTD(f)? Or are they the same as alpha-beta in this regard?

NegaScout/PVS improves alpha-beta by about 10%. For some people MTD(f) works
better, but it has some delicate problems associated with it.

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