Author: Richard A. Fowell
Date: 17:46:35 03/31/01
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On March 31, 2001 at 09:33:09, Tony Schleizer wrote: >Any idea how much stronger having the permanent brain option makes the program? > >Tony I would guess that "permanent brain" being worth 35 rating points. According to the SSDF FAQ (http://home.swipnet.se/~w-36794/ssdf/ssdf-faq.htm), doubling processor speed is worth 70 rating points. My understanding is that "permanent brain" means that the computer takes the most likely continuation, and thinks about it during your thinking time. So, if it correctly guess what your move is going to be, it gets to think twice as long (assuming you are both adhering to the same time control), which is equivalent to doubling it's processor speed (70 points). However, if it guesses wrong, this thinking time is wasted (as far as I know). I've been told that a 50% guess accuracy is typical, hence 70/2 = 35 rating points. One could experiment with this in computer-computer games, but it would take about 400 games to get an answer good to 30 rating points at 95% confidence. To have a good feeling that one had results good to, so 5 rating points at 95% confidence would take about 14,400 games. Which is why we guess a lot about these things <grin>. -Richard
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