Author: Dann Corbit
Date: 22:37:23 02/06/06
Go up one level in this thread
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. >I am sure I could >find the algorithm used to manipulate the node count in the REC output but I am >not so interested in that area. Possibly if I have some time to burn I will >look for it later. > >Ryan
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