Author: Alessandro Damiani
Date: 13:58:52 09/12/99
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On September 12, 1999 at 10:17:42, Robert Hyatt wrote: >On September 12, 1999 at 06:38:23, Alessandro Damiani wrote: > >>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 > > >I would _never_ argue with that. :) > >It _definitely_ produces problems in the right kinds of positions. It sort of >reminds me of banging your head against a brick wall for several minutes. The >only reason you would do that is because it feels _so good_ when you stop. Null >move is sort of like that... > >:) What I mean is that you use R=2 and not R=1. There is a difference in accuracy. Alessandro
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