Author: Christophe Theron
Date: 12:33:14 10/16/97
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On October 16, 1997 at 03:54:32, Ed Schröder wrote: >Just one comment for Rebel9. >Rebel9 is even more selective than Rebel8. > >That's very good for fast Pc's hitting new incredible ply depths. >From my AUTO232 tests on relative slow Pc's (Pentium 90) I get the >impression that this narrowed selective search pays even more. > >For Rebel9 I believe an overall engine improvement has been made of >30-40 ELO. It's a difficult topic so I am careful here but I for the >moment think: > >- Rebel9 (Pentium 90) improvement of 40-60 ELO above Rebel8. >- Rebel9 (P200 or higher) improvement of 20-40 ELO above Rebel8. > >This conclusion is based after I removed from all played AUTO232 games >all the doubles and also removed the effect of the book learner as far >that is possible of course. In the past it was generally admitted that doubling the speed of your program gave you around 50 more elo points (some say 60 or even 70, but this is not the point). But now we suspect that this strength increase is not linear. That is, doubling the speed of a 2000elo program can make it 2050elo. But doubling the speed of a 2400elo program maybe gives only 2430 or so. Let's suppose your new selection system makes your program twice as fast as the old one to get to the same ply level. Then you can except 50 more points on a P100 machine, but a little less on a P200. Maybe it is what happens with Rebel9? - Christophe -
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