Computer Chess Club Archives




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

Author: Robert Hyatt

Date: 19:22:22 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?

Run your program with a tiny hash and a deep search.  Then a big hash and
a deep search.  In middlegame positions this will be at least a factor of
2x.  Measure time to depth.  Small hash might take 4 minutes to get to depth
12, then big hash will take around 2 minutes...

I posted a bunch of this kind of analysis a few years ago when prompted by
Komputer Korner (Alan Tomalty).

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