Author: Ed Schröder
Date: 07:51:00 11/09/99
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On November 09, 1999 at 08:19:38, Eelco de Groot wrote: > >On November 08, 1999 at 12:05:10, Ed Schröder wrote: > >>On November 08, 1999 at 09:47:46, James T. Walker wrote: >> >>>On November 08, 1999 at 04:57:37, Jouni Uski wrote: >>> >>>>On November 08, 1999 at 04:33:54, Bruce Moreland wrote: >>>>. >>>>. >>>>. >>>>> >>>>>NPS is just some number that is easy to collect. It is not an indicator of >>>>>tactical speed, much less chess strength. >>>>> >>>>>bruce >>>> >>>>But I think normally it's quite good indicator for tactical speed. E.g. Fritz >>>>and Goliath are tactically two best engines by far... >>>> >>>>Jouni >>> >>>Hello Jouni, >>>I think you will find that Hiarcs is also tactically very good and it's NPS is >>>about 10% of Fritz. I am also curious as to which programs solved the most >>>problems and which one did it in the fastest time. To me, that is more >>>important than any NPS measurement. Especially since programmers can't even >>>agree on how to count NPS in their programs. >>>Jim Walker >> >>More about NPS... Rebel has a slow and fast evaluation function. When I >>tune to do more fast evaluations (in stead off slow evaluations) Rebel's >>NPS may go with a factor of 2/3/4. Meaning to say NPS doesn't mean much. >> >>Ed > >Do you have just two sizes for the evaluation function, Ed? I mean if you take a >higher number for Chess Knowledge, does that simply mean you lower the threshold >for when Rebel switches from fast evaluation to slow evaluation, based on data >from fast evaluation (I would guess)? Or is your implementation of lazy eval >more complex than that? It's indeed more complex than that. Set [Chessknowledge = 500] and NPS will go down, set [Selective Search = 001] and NPS will drop even more. Changing one parameter in Rebel (which isn't available for the user) and NPS will go up with a factor 3-4 which means Rebel would go over 1,000,000 NPS on a fast PC. The bottom line is that NPS (like ply-depth) is pretty meaningless. Ed >Thanks for any answer, >Eelco
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