Author: Robert Hyatt
Date: 11:18:47 09/10/99
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On September 10, 1999 at 13:20:06, Steve Maughan wrote: >>I see. I assume you only have the A/B bounds for getting the best move? >>I use an extra bound so I always have a best move. > >Talk of an extra bound by someone like Ed Schroder is not something to pass over >lightly! > >Any clues as to what this extra bound is? If you want to find a best move from >every ply then the only thing I can think of is to count the number of nodes >required to refute each move. The move that has the highest refutation count >can be assumed to be reasonable, if not the best. I believe Bob uses something >similar to re-order at the the root after an iteration. > >Am I close? > >> >>Ed I don't think so. I believe the 'extra bound' is just the 'best value' returned by any search at a node where the value is still <= beta. So he has alpha and beta (normal bounds) plus a 'gamma' that is < alpha that represents the best guess of the real score for the best move... I'm convinced it doesn't work (but this is already in another thread)...
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