Author: Dann Corbit
Date: 21:16:39 11/09/99
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On November 09, 1999 at 23:12:05, blass uri wrote: >On November 09, 1999 at 19:41:02, Dann Corbit wrote: >>On November 09, 1999 at 10:51:00, Ed Schröder wrote: >>[snip] >>>It's indeed more complex than that. Set [Chessknowledge = 500] and NPS >>>will go down, set [Selective Search = 001] and NPS will drop even more. >>> >>>Changing one parameter in Rebel (which isn't available for the user) and >>>NPS will go up with a factor 3-4 which means Rebel would go over 1,000,000 >>>NPS on a fast PC. >>> >>>The bottom line is that NPS (like ply-depth) is pretty meaningless. >>I think that ply depth is an excellent indicator of understanding of the >>position unless the program has bugs. That is to say, if one program finds a >>best move at ply 10, so will the other most of the time. > >No because the extensions are not the same. >Chessmaster6000 often can see at depth 3 things that other programs cannot see >at depth 10. > >The brute force depth of chessmaster6000 is often not more than 4 at tournament >time control. >Chessmaster show 2 numbers and I understand that the first number is the brute >force depth and the second number is the selective search depth. >The default personality(tested by ssdf) has the parameter ss=6 > >If I see numbers like 4/10 the meaning(if I understand right) is that it looks >at everything at depth 4,almost everything at depth 10 and does also extensions >after it. That just means (to me) that they are not reporting the depth in plies but something of their own measure. I also think that there can be two ply measures: 0. Actual depth in plies for exhaustive search (less pruning, nullmove...) 1. Speculative plies (capture extensions, check extensions, etc...) If we have a clear indication for both of these measures then I think that programs would agree on the results most of the time. If someone has something else and they call it a ply you cannot make any predictions because of that.
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