Author: Dave Gomboc
Date: 03:48:21 10/14/99
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On October 14, 1999 at 03:56:14, Ratko V Tomic wrote: >Of the commercial chess programs, as far as I can sense throuh play, only Rebel >has some appreciation of the error in the evaluation, and will pass the small >gain in a essentially won position, if the small gain will bring complication >(without there being any near term threat to it). (Ed might be able to confirm >whether it does it explicitly or such behaviour may be a beneficial side-effect >of something else.) I am under the impression that it is fairly common for programs to not switch to a new move unless it is some epsilon better than their previous move, where epsilon is larger than the difference in representable scores (e.g. epsilon > 0.01 for centipawn evaluators.) >Of course, if I discover 2 lines, one gaining +1 the other +1.5 I'd pick the >better one. But the choices I was talking about had caveats. If a game result >mattered in some way (not a fun game played against a program in the privacy of >my home), and I have found +1 line already, and I don't know whether there is a >+1.5 gain, if only I were to choose a different initial move (if it is the same >initial move as +1, I don't need to find it now), unless I were to spend another >several minutes looking at the variations, I would take the +1 I already know, >rather than gamble valuable time on low odds hopes of finding even more. Wasn't it Lasker who said "when you find a good move, look for a better one"? Dave
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