Author: James Constance
Date: 00:33:24 03/31/03
Go up one level in this thread
On March 30, 2003 at 17:18:31, Chris Carson wrote: >On March 30, 2003 at 16:33:52, James Constance wrote: > >>On March 30, 2003 at 16:02:55, Chris Carson wrote: >> >>>On March 30, 2003 at 15:24:13, James Constance wrote: >>> >>>>On March 30, 2003 at 13:35:07, Chris Carson wrote: >>>> >>>>>On March 30, 2003 at 11:53:21, James Constance wrote: >>>>> >>>>>>1. Why is there such a difference in Nodes Per Second in Pocket PCs when >>>>>>compared with PCs? e.g. Shredder on my Athlon 1200 Mhz might do 180,000 NPS for >>>>>>a given position, whereas my StrongArm 200 Mhz does only 4,500 NPS for the same >>>>>>position. That's a factor of 40 - I was optimistically expecting it to be >>>>>>closer to the ratio in processor speeds. >>>>>> >>>>>>2. Anybody have a stab at how much this reduces the SSDF quoted rating by? >>>>>> >>>>>>cheers! >>>>> >>>>>I collected NPS for a few Pocket PC's and Palm devices and also for the SW on >>>>>PC's. The 206 seems to be about the same NPS as a 33Mhz 486 and about the same >>>>>playing strength. For a specific program (ie Ruffian or Chess Tiger), the ELO >>>>>will drop by about 70 points for each 50% reduction in NPS. So a Pocket PC >>>>>206Mhz is about 400 points weaker than an AMD 1.2Ghz. Same for the Palm. Take >>>>>a look at the SSDF list: >>>>> >>>>>http://w1.859.telia.com/~u85924109/ssdf/list.htm >>>>> >>>>>Chess Tiger 15 AMD 1.2Ghz is 2726 SSDF >>>>>Chess Tiger 14.9 Palm m515 is 2101 SSDF >>>>> >>>>>Ruffian 1.01 AMD 1.2Ghx is 2671 SSDF >>>>>Ruffian 1.04 ARM 206Mhz is 2050 aprox. >>>>> >>>>>I have played all four of the above and this is also my experience. I am rated >>>>>2150. I have also posted NPS for the four above in previous posts as well as >>>>>Chess Genius (similiar experience on both machines for CG). >>>> >>>> >>>>Interesting reply, thanks. Do you mean 2250 for Ruffian, then? >>> >>>No, 2050, I ment 600 points less, not 400, type. Sorry. >> >>I'm surprised that you find CT on the palm to be stronger than Ruffian on the >>PPC. What speed is the m515? CT on my 33Mhz palm displays 550 NPS (i.e. 8 >>times less than pocket fritz2 - CT and Shredder are almost the same on the PC) >>for the same position; so given that there's not a huge difference in the >>playing strength of the programs at the 1.2 Ghz level, I'd expect Pocket Ruffian >>to be higher. > >I will post the NPS for CT tomorrow, it is on my other machine. The 206 >processing power may be restristed by bus size, Tom K. posted this possibility >on a different thread. > >Ruffian could be stronger, it is just an estimate based on NPS and my own >playing. Extensive testing could show Ruffian to be stronger, I wish we had >more extensive comp vs comp and h v comp for the PPC and Palm devices. Since I >play Ruffian on both the AMD 1.2Ghz and the PPC, it is possible that I have just >developed some Ruffian specific defenses. Chessreviews.com says of Pocket Grandmaster 2 "The version of Ruffian included with the program plays at much lower strength than its PC cousin. The reason is unoptimized code (this may change in the future). But as it is, it makes a very good, human-like opponent." I don't know where the reviewer got the information, but that could be significant.
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