Author: Engin Üstün
Date: 10:37:43 02/07/06
Go up one level in this thread
On February 07, 2006 at 06:59:21, Uri Blass wrote: >On February 07, 2006 at 01:37:23, Dann Corbit wrote: > >>On February 06, 2006 at 22:25:35, Ryan B. wrote: >> >>>On February 06, 2006 at 21:58:39, Dann Corbit wrote: >>> >>>>On February 06, 2006 at 21:47:09, Ryan B. wrote: >>>> >>>>>On February 06, 2006 at 17:20:00, Alvaro Jose Povoa Cardoso wrote: >>>>> >>>>>>Some time ago I saw someone reporting (don't remember if it was here) Rybka >>>>>>doing 30Knps, while crafy 19.x doing 800Knps and Fritz8 doing over a million nps >>>>>>on his pc while beating both crafty and fritz. >>>>>> >>>>>>Over the years computer programmers said that nps was an importante factor in an >>>>>>engine performance, (and I agree, look at Deep Blue and Hydra). >>>>>>In face of Rybka nps, my question is: >>>>>>What the hell is going on? >>>>>>In this department Rybka seams to prove that nps isn't a factor for performance >>>>>>at all. >>>>>> >>>>>>Please state you opinion on this. >>>>>> >>>>>>best regards, >>>>>>Alvaro Cardoso >>>>> >>>>>Rather it is to hide extra hidden search or for marketing propaganda I do not >>>>>know but I do know Rybka manipulates its node count. >>>> >>>>By what means do you know this? >>>> >>>>>What is really important >>>>>is the tactical strength of Rybka not the NPS. It will be interesting to see >>>>>what other engines have similar success after going back to try “old” ideas. >>>>>Also not that Rybka is bad in endgames, I think it is rather good, but it will >>>>>be interesting to see how Vas handles the endgame issues in Rybka. It does not >>>>>seem that it will be as simple as just adding endgame knowledge. >>>>> >>>>> >>>>>Ryan >>> >>> >>>At low depths the node count can go down from one depth to the next. That >>>should be proof enough as node count should never go down. >> >>It could conceivably happen due to hash table and forced replies. > >Reduction in nodes per second can happen but not reduction in the total number >of nodes and I remember a post of enrique that showed reduction of total number >of nodes in rybka at small depth and you probably need slow hardware to >reproduce it. > >If you see Reduction in nodes per second after few seconds of analysis with >rybka then the conclusion is that Rybka probably manipulates its node count. > >Uri Or its a bug ?!
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