Author: Dann Corbit
Date: 14:35:05 06/18/99
Go up one level in this thread
On June 18, 1999 at 12:18:14, Michel Langeveld wrote: >>>>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 shall be intensely interested to find out. >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?? Different, because e.p. flag set differently. However: 1 e3 e6 2 d3 1 d3 e6 2 e3 is counted as the same position, because the e.p. flag does not get in the way. >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 Looking forward to anything you discover.
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