Author: Uri Blass
Date: 22:48:44 11/06/00
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On November 07, 2000 at 00:44:43, Christophe Theron wrote: <snipped> >Programs of 1990 include the Mephisto line on 680xx. In 1990, it was the >Mephisto Lyon. I guess it was running on a 68030. I find Mephisto lyon on 68030 36 mhz in the ssdf list(rating of 2151 that is 479 elo weaker than Fritz6a) I believe that it was an hardware dedicated for chess and it means that it cannot run on 1Gh computers. <snipped> >It's just an exception. Generally, 12 plies of extensions is more than enough. It was more than enough for slow hardware but I believe that it is often not more than enough with the hardware of today in tournament time control. Remember that the 12 plies of Genius included also the Qsearch. <snipped> >If doubling speed accounts for only 30 elo (to take into account an hypothetical >"dimishing returns"), that still makes 299 elo points. > >I don't believe there is 300 elo points of difference between current best >programs and the best program of 1990 if they are run on equal hardware. The difference between 500Gh and 1 Gh is almost 9 doubling and it means 270 elo points difference(assuming 30 elo for doubling). Here is some information about the difference in rating based on the ssdf list. Fritz6 is 78 elo better than Fritz5.32 on the same hardware(450Mhz). Fritz5.32 is 56 elo better than Rebel9 on the same hardware(200Mhz) Rebel9 is 31 elo better than Genius4 on the same hardware(p90) Genius4 is 109 elo better than Fritz3 on the smae hardware(486 50-66 mhz) Fritz3 came some years after 1990 and the difference is 78+56+31+109=274. > >Branching factor at very slow time controls can also be an issue, but I don't >believe 1990 programs had such a terrible branching factor. The only way to know is by testing. I did not test programs of 1990 but I know that hiarcs7.32 starts to have terrible branching factor at long time control(I guess that 6 or 7 is the average branching factor of hiarcs at long time control but I did not do statistics about it). My experience with the branching factor of Genius3 at long time controls is better and 4 is the typical branching factor. I suspect that part of the programs have terrible branching factor at long time control because they were not tested at this time control. Uri
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