Computer Chess Club Archives




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

Author: Sune Fischer

Date: 05:38:52 07/20/02

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On July 20, 2002 at 08:13:44, Gian-Carlo Pascutto wrote:

>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?

You have 1 ply to go, you probe and get a hit based on a 10 ply search.

Or, what is perhaps more likely, a 6 ply result when you only had 4 plies to go,
that is still 2 more plies of accuracy and you also prune/transpose at the same



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