Author: Sergei S. Markoff
Date: 23:28:43 03/11/04
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Hello! >In MTD(f), of course >alpha but <beta is not even possible. Yes, MTD(f) null-move work is like if we use null-move search result if it's >alpha but <beta. In practice, I tried it some time ago, it causes a big disadvantage. I see two problems with it: 1. It increases search instability. Null moves more frequently appears in PV nodes. 2. It causes more zugzwang problems. And a cost of this problems in average is much more than in non-PV nodes. >I have no idea what Fritz does, but I have a primitive technique >which at least helps in some simple cases: I don't allow null >moves in positions where the side to move has very few safe >pseudo-legal moves. I have heard about efficiency of scheme in which exact two zero moves in a row are allowed. In one hand it can help us in a lot of zugzwang positions, but anyway it causes stronger search degeneration. But I think there are ways to fix this problem particularly. >This is another technique I have experimented with, but the last time >I tried it didn't work very well. I'm still in thought about this part. I'm not sure that my scheme works well. We can discuss some more details by e-mail, if you want. Best wishes, Sergei
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