Author: John Merlino
Date: 12:13:11 02/22/01
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On February 22, 2001 at 04:51:06, Mike S. wrote: >On February 21, 2001 at 21:12:40, John Merlino wrote: > >>>Thank you for saying so. However, there were only five personalities that were >>used in the test: Chessmaster, Josh Age 9, Willow, Sonja and Skippy -- basically >>personalities with ratings of approximately 2500, 2000, 1500, 1000 and 500 >>respectively. With these five "real world" anchor points, the ratings data >>probably became a fair bit more accurate, but I would still venture to say that >>some, if not many, of the personalities are between 50 and 150 points off the >>mark. >> >>As for it being a selling point, I'm sure it's mentioned somewhere on the box. >>;-) > >I liked this personalities too, playing some of them in CM6000. > >But what I always wanted to ask: How does the processor speed affect, what these >personalities play? In other words, does a 1850 personality make the same moves >on a P90 and on a P3/800 (at the same time control)? > >And if not, what is the "standard measure" of CPU clock rate they are designed >for, or have been rated with? After all, there's a very wide range of different >pc speed among the users (which could result in a rating difference up to >approx. ±200 elo IMO, if no adjustments are made). > >Thanks, >M.Scheidl Uri's response is mostly correct. I'll just add a few details: The "1850 personality" will not necessarily make the same moves on a P90 as on a P3/800 if that personality does not use a fixed depth. As with any engine that is not limited in its search depth, the deeper it can search (either because it has more time to search, or because it has a faster processor), the more likely it will be to "change its mind". Each personality's rating is based on a P2/233 (the minimum spec machine for CM8000), and all of the test games were played at Fischer 5/10. If a personality does NOT have a fixed depth less than the maximum, then it MIGHT get a bonus based on processor speed. The farther away the personality's rating is from the highest personalities, the less of the bonus it gets. The math is approximately 70 points of bonus for each doubling of processor speed, so an 8-fold increase in speed results in a 210 point increase for the strongest players. jm
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