Author: Jeremiah Penery
Date: 00:52:57 10/09/02
Go up one level in this thread
On October 09, 2002 at 02:21:00, Gian-Carlo Pascutto wrote: >Deep Fritz at least outsearches Deep Blue nominally by 4 ply, >so your reasoning makes no sense. Depending on how you count plies. You could say that Junior searches twice as deep as Fritz, but we know it's not really searching the same kind of plies. Here is a quote from Hsu's book: "Before Deep Blue went into the panic mode for Bxd6, it had come up with an unusual principal variation when it finished its 9-ply search. The main line it gave was 15-ply deep. This number, however, was only search depth on the master workstation, and did not include the additional search depths on the slave workstations (2+ plies), and on the chess chips (4+ plies)." (Hsu,229) So it makes sense that 9(6) means 9 plies on the master workstation, and 6 plies combined in slave workstations + chess chips. Also, when Hsu quotes a depth of "12-ply" or something for DB, I doubt he's counting the hardware there either, but possibly he is counting the slaves. This, for the simple reason that the chess chips were not used exactly in the 'normal' way of simply splitting the search to them with X remaining depth. Instead, the slave workstations passed positions and evaluation weights to them, upon which they did an EXTRA n-plies of search - Almost more like a fancy q-search than a part of the normal search.
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