Author: Don Dailey
Date: 16:41:54 05/07/98
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>I do often watch cstal vs. genius. >In the moment you see genius evaluate its position - 1 pawn or even >bigger, you can switch off tal-function. >I have tried out by making me two styles: >beforeWIN and afterWIN. >I use beforeWIN to reach a winning position and when the opponent is >down I can load style afterWIN. > >Of course this is only testing possibilities. >Chris could implement it much better than I emulate it. But it is worth >trying it out. I don't see how this can be easily progarmmed without knowing genius's evaluation. Cstals evaluation is unreliable in the sense that it doesn't measure the positions goodness conservatively, in the same way other programs do (at least relative to cstal.) If the programmer used a conservative version to test for "winningness" it's defeating the whole idea not to mention really expensive. The whole problem is judging when to switch over and I'm guessing Genius evaluation is the best measure of this! But don't ask Cstal when to switch over. I'll bet this wouldn't improve Cstal's results though. I think it's much more productive to have the programmer add more knowledge about when to be conservative and when not to. By the way, I too am impressed with the way Cstal plays chess. It seems to know when to play an unsound attack and get away with it! At the Aegon Cilkchess played a few games with it and didn't do very well. In most of the games Cilkchess was winning until Cstal made an UNSOUND winning move! However, I want to mention that CSTAL had a big hardware advantage, I was running on a slow laptop with the serial version of Cilkchess, tiny hash tables and no thinking on the opponents time. The hardware was about 3 to 1 in favor of CSTAL. But I could see that CSTAL was not weak and played extremely provocative chess style. Much nicer than Cilkchess's boring style. - Don
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