Author: Bas Hamstra
Date: 04:26:18 11/18/99
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Interesting discussion. I have a microscopic comment for Christophe: >Take null move for example. Suppose you are at two plies from the horizon and >it's your turn to move. Here you notice that you fail high (your score is above >beta = really good), so you execute a null move (make nothing but change the >side to move), reduce the depth, and as it is already low enough you just do a >capture search for your opponent. If you still fail low (= your opponent cannot >execute a capture that gains material) you stop searching here. What you are saying is nullmove near the leafs makes errors. I agree. But if you would skip nullmove there, and make sure a nullmove is followed by at least one real move, it costs you a ply (something like that according to my testing). So you *still* wouldn't see that crucial non capturing rookmove. And it will see it the next iteration, in both cases. So what you are saying sounds good, but still is not immediately convincing... Regards, Bas Hamstra.
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