Author: Tom Kerrigan
Date: 13:10:21 01/27/00
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On January 27, 2000 at 14:36:08, Dann Corbit wrote: >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. This is b/c everybody's search algorithm is a little different. That makes computer chess fun. =) -Tom
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