Author: Dann Corbit
Date: 11:36:08 01/27/00
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On January 27, 2000 at 07:32:47, walter irvin wrote: >actually i dont know what the log means . i thought it was like a brute search >of 10 or 11 ply .like in hiarcs it will say 9/23 meaning 9 ply full width 23 >selective ??? First of all, DB does not use NULL move. So a ten ply search has examined many times as many nodes than a ten ply search that does use NULL move. Then, at some point in the process, DB begins to examine favorable possibilities. The actual depth in plies along these lines can be many times longer than the "sphere of perfect knowledge" and hence the plies do not relate to the plies of any other program that I know. Junior also uses a very different terminology for plies. I think it would be good if we could come up with an accurate description of different types of ply. Right now, there is none that is technically accurate and widely used. Hence if Joe says "My program searched 9 plies" and Fred says, "My program searched 8 plies" we don't really have a very good idea how these relate.
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