Author: James Swafford
Date: 11:36:07 10/13/02
Go up one level in this thread
On October 13, 2002 at 14:14:13, Vincent Diepeveen wrote: >On October 13, 2002 at 13:50:24, Jeremiah Penery wrote: > >for any chessprogrammer it is very clear Jeremiah. > >It's 12 ply and the 6 only means that the hardware search can >be up to 6 ply within that 12 ply nominal. No. "the PV could be up to 6 plies DEEPER." I take this to mean the PV is at least 12 ply brute force. There may have been up to another six ply searched in hardware, for a total of between 12 and 18 ply. -- James > >it's excluding extensions and qsearch moves of course that depth. > >Very clear to me. > >Also page 5 from artificial intelligence: "nominal depth 12.2 ply average" > >very clear to me. > >>On October 13, 2002 at 13:19:34, Peter Berger wrote: >> >>>On October 13, 2002 at 12:00:39, Andrew Williams wrote: >>> >>>>Several people asked: >>>> >>>>Question: What does "12(6)" mean in Deep Blue's logs? >>>> >>>>Dr Hsu said, "12(6) means 12 plies of brute force (not counting the search >>>>extensions & quiescence). 6 means the maximum hardware search depth allowed. >>>>this means that the PV could be up to 6 plies deeper before quiescence." >>>> >>>>Unfortunately questions were being fed through a third-party, so it wasn't >>>>possible to get a follow-up. >>>> >>>>Andrew >>> >>>How about this one? >>> >>>EeEk(* DM) kiebitzt: kib question from ardee: Does "12(6)" mean 12 total ply or >>>12+6=18 total ply? This has the been source of huge arguments for years! >>>CrazyBird(DM) kiebitzt: 12 total in terms of brute force. 6 is just the max >>>partition in hardware. >>> >>>This one sounds pretty clear to me. >> >>I still don't think that's very clear. What does he mean by 'brute force'? >>The other answer to that question[1] implies that 12 is the software depth, and >>the hardware could add a maximum of 6 plies, not counting quiescence. If not, >>then it's still impossible to explain a number like 4(5), which comes up more >>than once in the logs. >> >>[1] - Dr Hsu said, "12(6) means 12 plies of brute force (not counting the search >>extensions & quiescence). 6 means the maximum hardware search depth allowed. >>this means that the PV could be up to 6 plies deeper before quiescence."
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