Computer Chess Club Archives




Subject: Re: Verified Null-Move Pruning, ICGA 25(3)

Author: Gian-Carlo Pascutto

Date: 04:26:02 11/22/02

Go up one level in this thread

On November 22, 2002 at 07:11:20, Uri Blass wrote:

>It may be interesting if you can post results of deep sjeng at 300 seconds per
>position and not only at 10 seconds per position.
>The difference for movei is smaller at 300 seconds per position and I did not
>use research(I suspect that with research reults may be better).

I expect it to do better at longer times too of course, for the reason
pointed out in this thread than it becomes more comparable to R=3. R=3 is
superior in Deep Sjeng compared to verified R=3, so as verified gets
closer to R=3, it will do better, but I don't expect it to do
"better than R=3".

I have different testing priorities right now because in any case it
looks vastly inferior to what I am doing now (not R=3 and not R=2/3).

It would have been nice if it was better than R=2/3, but so far, noone
reported success...

>My hardware is AMD1000Mhz so you can use smaller time to get eqvivalent results
>but clearly more than 10 seconds.
>You can also see that there is a problem in comparing correct results because
>some problems that are solved by movei with R=3 are not solved for the right
>reason and movei may change it's mind later(I showed one case when it did it).

Not much of an issue considering that there are 183 positions total
and I average the solution time over at least 115 of then.

BTW. Uri, since you use ECM-GCP as well, and you've posted corrections,
I assume you have an improved version. Would you care to email it to me?


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