Author: Alessandro Damiani
Date: 03:38:23 09/12/99
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On September 11, 1999 at 22:25:24, Robert Hyatt wrote: >On September 11, 1999 at 17:48:55, Alessandro Damiani wrote: > >>On September 11, 1999 at 15:59:19, Ed Schröder wrote: >> >>>On September 11, 1999 at 15:36:18, Robert Hyatt wrote: >>> >>>>OK... then we are 'in sync' here it seems.. >>>> >>>>As far as PVS, the main advantage is that since almost everything is searched >>>>with a null-window, it saves nodes, _IF_ you do well at move ordering (I have >>>>no doubt that you do well so PVS might be a win for you too)... >>>> >>>>It reduced my trees by 10% and loses nothing at all... unless you screw >>>>up move ordering, then it can make the tree bigger as you first search with >>>>a null window, then you have to re-search with the normal window... >>> >>>Thus, PVS is aspiration search with a null-window? Is that all there is? >>> >>>Ed >> >>I think there is problem with the combination null-window and forward pruning: >>forward pruning is not perfect. So there are more wrong cut-offs with PVS than >>without. This could affect positional play. >> >>Alessandro > > >I don't do forward-pruning at all. Other than the sort of similar idea that >comes out of null-move search with R=2... But null-move is not perfect, too. So there are wrong cut-offs, mainly after quiet moves. Alessandro
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