Author: Les Fernandez
Date: 17:13:44 06/18/99
Go up one level in this thread
On June 18, 1999 at 12:18:14, Michel Langeveld wrote: >On June 17, 1999 at 19:06:49, Dann Corbit wrote: > >>On June 17, 1999 at 19:01:31, Dann Corbit wrote: >> >>>On June 17, 1999 at 17:30:00, Dann Corbit wrote: >>> >>>>We all know that move generators can tell us how many legal moves exist in the >>>>first <n> ply if written correctly. Here is a new kind of question about it: >>>>How many "distinct/unique" positions are there in the first n ply? >>>>Some answers: >>>> >>>>Ply: Number: >>>>---- ------- >>>>0 1 >>>>1 20 >>>>2 400 >>>>3 7,602 >>>>4 101,236 >>> 5 1,244,216 >>Interesting how much ply 5 is reduced (from 4,865,609 raw positions). The >>reduction should be [in fact] MUCH GREATER, since most of the e.p. tags have no >>effect at this point. > >Dann good point!! > >I shall try to help whatever is possible. >I hope to finish today a full 9 ply search :-)))). > >I think the value of positions with epfield counted as different when the >epfield can't be hit is not valuable. A position after: > >1 e4 e5 2 d4 is the same as >1 d4 e5 1 e4 > >Do you have counted this as different?? > >Also castlingrights (KQkq) should be counted as different. > >A position after > >1 e3 e6 2 Ke2 Nf6 3 Ke1 Ng8 is different as: >1 e3 e6 2 > >Cheers!! > >Michel Langeveld (rudolf@stad.dsl.nl) Hi Michel Dann and I spoke about this study and both of us were extremely excited about the results so far. Michel if you should complete your 9 ply results I would be interested in seeing them when they are available as I am sure Dann would be also. Are you going to run both LEGAL and UNIQUE positions? Thanks Les
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