Author: Frank Wies
Date: 19:59:30 12/19/05
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On December 19, 2005 at 19:13:22, Andreas Guettinger wrote: >On December 19, 2005 at 18:32:07, Frank Wies wrote: > >>I think that the handicap put on Rybka is unrealistic. When I run engine matches >>on my quad opteron 2.2GHz Rybka wins about 2-1 verses Deep Shredder 9x64. On >>this rig, Fruit 2.2.1 was slightly ahead of Deep Shredder 9x64. >>These were 1'0" games, where I expected DS9x64 to have a substantial advantage. >>If you put enough of a hardware handicap on any engine, it will fail. >>Try switching the hardware and I expect the Rybka with only one of the Power >>Pc's will beat the Pentium. >> >>Cheers, >>Frank > >I disagree. >First, to initialize and coordinate the parallel search might give some >overhead, therefore it can be that on such fast time controls (1 min per game) >the Quad version is actually weaker than the single CPU version. I don't speak >about NPS. I remember crafty purposely using only 1 CPU in the recent WCCC blitz >tournament of it's 8 available. If this is the same for Deep Shredder9 I don't >know, depends on search implementation. Of course one could make a match between >Shredder9 and Deep Shredder9 with 1' 0" to test this. >Therefore I think you cannot compare 1'0" matches with 4'2" matches. >(I consider 1' 0 matches a joke anyway, because I think you don't measure chess >playing strength with this.) > >Secondly, as stated previously, Rybka is not available for PowerPC. > > >regards >Andy Hi Andy, Your assupmtion is incorrect regarding DS9 using all for cores ... once out of book it is using all four between 90-100% of CPU available ... permanent brain is off. Rybka is limited to one. The 1' time controls do show that Rybka has a very efficient search function and when the deep version comes out that should speed things up a bit more. This is a display of playing strength, but may put some of the less efficient but more robust engines at a disadvantage. As you can see on the playchess server, Rybka is in all of the top spots. When you put them on equal hardware, the results will be the same. Rybka is just outplaying all of the other engines. Regards, Frank
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