Author: William H Rogers
Date: 14:51:36 06/18/99
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On June 18, 1999 at 14:21:13, Dann Corbit wrote: >On June 18, 1999 at 09:40:00, William H Rogers wrote: > >>On June 17, 1999 at 17:30:00, Dann Corbit wrote: >> >>>Ply: Number: >>>---- ------- >>>0 1 >>>1 20 >>>2 400 >>>3 7,602 >>>4 101,236 >>> >>>I'm doing ply 5 right now. >> >>Just what exactly is a "distinct/unique" position and what are the proposed >>moves for both sides leading to your numbers.? >Distinct/unique removes all positions that are exact duplicates generated >through a different path. The normal ply counters just add up all the legal >positions that can be generated. But I have done a study to find out how many >*different* positions there are. It is a *lot* less than the set of legal >positions with duplicates, and seems to shrink faster and faster with ply count. I am having problems with the above calculations, i.e. Ply Number 1 20 - assume e4 2 20 x 20 = 400 - assume e7 3 29 x 400 = 11,600 4 29 x 11,600 = 336,400 Those represent all legal moves, however 4 depends on the move made at 3, it could be a little smaller. I don't think that there are any duplicates in this list. These are the nodes my program generates and a few others that I can think about. Although some programs use forward pruning and some would not consider some of the moves as they are of less value than others. Where am I wrong or misunderstanding? Bill
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