Author: James Swafford
Date: 21:44:20 10/18/02
Go up one level in this thread
"Any idiot can see he said 12 ply" said Vincent. :) -- James > >Next question: Seems like people wants to know what the exact meaning of >""12(6)" in the Deep Blue log files, can you explain this? >CrazyBird: 12(6) means 12 plies of brute force (not counting the search >extensions & quiescence). >CrazyBird: 6 means the maximum hardware search depth allowed. >CrazyBird: this means that the PV could be up to 6 plies deeper [than what is >displayed by software] before quiescence. > >[The 6 plies is the maximum. Deep Blue had a dynamic horizon between software >and >hardware search. This horizon could be as close as 3 plies from the true >quiescence horizon or as far as 6 plies from it in this case. Tactical positions >tend to have the software horizon pushed closer to the true horizon. During the >two matches, the maximum PV length in middle game (“quiet” or tactical) shown by >the software was of the order of 40 plies, which means the true PV length may be >up to 46 plies + hardware search extensions + quiescence search (which may >include up to 8 checks).] >
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