Author: Robert Hyatt
Date: 19:25:24 09/11/99
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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...
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