Computer Chess Club Archives




Subject: Re: Null-Move: Difference between R = 2 and R = 3 in action

Author: Gian-Carlo Pascutto

Date: 05:13:44 07/20/02

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On July 20, 2002 at 08:04:01, Sune Fischer wrote:

>I think it matters "a factor of 2".
>1) it helps you to prune
>2) you get better evaluation in the upper plies when you can return a score
>based on a deeper search.
>number one will show itself directly because you iterate deeper, the second one
>you don't "see", but it does improve depth along some branches in the same way.

1) I get +- 10% hash hits (and less prunes) in typical middlegame. Not enough to
matter a factor of two (but I didnt check this so not 100% sure).

2) Uh?


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