Computer Chess Club Archives




Subject: Re: Nodes per second........

Author: William H Rogers

Date: 07:41:29 09/28/98

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On September 26, 1998 at 17:21:58, James Robertson wrote:

>What is a reasonable number of NPS for a program to search if it has an average
>sized evaluation procedure? I.E. what does Crafty get? Chessmaster? Comet? My
>program started out searching a very nice number of nodes per second, but as I
>added stuff that number decreased dramatically from about 600,000 to 160,000. By
>the time I finish the evaluation function (which is currently like 20 lines),
>I'm afraid it will be down to like 5,000 NPS on my P233! At what point should I
>get worried?
The only time you should worry is when you newest version starts playing worse
than your old version. It was once written that if you had a perfect evaluation
function, you may not have to search deeper than one ply. This may not ever be
accieved, but the theory is justified. If searching 1,000,000 nodes does not get
better results than searching on 5,000 then stick with the 5,000. It is after
all the programs playing strength that counts, not how much it has to search to
achieve that goal....

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