Author: Will Singleton
Date: 14:35:20 11/19/98
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On November 19, 1998 at 16:03:58, Peter Fendrich wrote: >On November 19, 1998 at 15:43:56, Will Singleton wrote: > >>All, >> >>I am using a null-move error finder that works like this: if a null move causes >>a beta cutoff, I set a flag instead of returning the null move score. If the >>regular search then doesn't cause a cutoff, it's a failure. > >I hope I understood this right: >You are using this function as a "debugging" tool and not in your ordinary >search engine, or...? Yes, as a debugging tool. >> >>This happens in several of the wac positions, causing problems. One solution >>I've heard of is to disallow null moves in the principle variation. Since I >>generally ignore the pv during the search, I'd have to do a fair amount of >>coding to test this. >> >>Does restricting null moves in the pv guard against null-move failures? > >No it doesn't. A null move error might be the reason why a variation didn't >became the pv in the first place and that doesn't change with this restriction. Right, I had just figured this out. >Another problem with this is that the pv and it's branches take up most of the >search time. The null move approach is most valuable right here! > That's another good point. btw, I don't do a zugzwang test, just disallow null moves in the endgame. How about you? Will
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