Author: Uri Blass
Date: 09:51:27 02/04/05
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On February 04, 2005 at 12:07:34, Robert Hyatt wrote: >On February 04, 2005 at 10:50:31, Uri Blass wrote: > >>On February 04, 2005 at 10:18:36, Robert Hyatt wrote: >> >>>On February 04, 2005 at 06:43:24, S J J wrote: >>> >>>>When a program reports a ply count, is it the number of ply that have the moves >>>>100% generated without pruning, or the deepest node that is checked with >>>>extensions, or something different? >>>> >>>>Steve >>> >>> >>>Depends on the program. Generally accepted practice is to report the number of >>>plies searched full-width not counting extensions or q-search. Some programs >>>(such as Junior) use "ply" in a different way which can be misleading if you >>>compare plies between two programs. >> >>Usually it is not full width because of null move pruning. >>There are a lot of program that use other pruning ideas. >> >>Uri > > >Technically null-move is full-width, but reduced depth. I don't throw out _any_ >moves and not search them, so the search itself is full-width. I just search >some to reduced depth. It is not exactly reduced depth. If a move has no threat and it is not an endgame you do not search what happen after legal moves of the opponent so you will never see some zugzwangs. You also said: "Generally accepted practice is to report the number of plies searched full-width" Even without the problem of zugzwangs 12 plies with null move pruning is not 12 plies searched full-width. Uri
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