Author: Vincent Diepeveen
Date: 11:14:13 10/13/02
Go up one level in this thread
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. 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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