Author: Robert Hyatt
Date: 09:08:38 02/04/05
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On February 04, 2005 at 10:32:19, S J J 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. > > Thanks Robert. If you assume a branch factor of 30, does that >mean that a program that reports a 12 ply search had generated and >scored all 30^12 (5.3x10^17) positions? No, because of alpha/beta. Many positions can be partially searched to prove they are worse than the best found so far. 30^6 is a closer estimate, but that ignores q-search and search extensions which drive that up.
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