Computer Chess Club Archives




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

Author: Uri Blass

Date: 06:20:41 07/20/02

Go up one level in this thread

On July 20, 2002 at 08:38:52, Sune Fischer wrote:

>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

I doubt about the accuracy.

You may remember a draw score and use it
when practically it is not a draw because
the draw score is based on previous positions and when
you get the same position again the previous positions
are not the same.


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