Author: Roberto Nerici
Date: 00:33:22 11/21/03
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On November 20, 2003 at 22:56:45, Russell Reagan wrote: > >Also, it might be that with faster hardware, a 2x speed increase might not >amount to the same ELO increase as it does for slower hardware (hince why >Thompson got different numbers from SSDF). This is often suggested. Ernst Heinz and Robert Hyatt and several others have researched this (e.g. "Crafty goes deep" in the ICCA/ICGA journal). Another factor is how the measure is made. I think the Thompson experiments you refer to used self-play. It seems likely to me that you would get large improvements for depth/speed improvements when two copies of the same engine are playing themselves. After all, the deeper version sees everything the first sees and then a little bit more (it is more interesting to think why it sometimes loses!) The SSDF figures are comparing engines on a faster platform playing a range of engines on a slower platform. They may be less sensitive to speed improvements. Finally, there may be different results again if playing a human. I would guess that since engines are more similar to each other than they are to humans, the gain from a given speed improvement would be lower still against a range of human players. Roberto/.
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