Author: Joshua Lee
Date: 19:10:40 08/23/00
I was wondering what Ply equivalent for Comercial programs to equal Deep Thought's at 11 and 16? In Monty Newborn's book Kasparov versus Deep Blue it says on page 156 that Deep Thought 0.02 searched at 1,440,000Nodes per second to a Depth of 10 in typical middlegame positions(whatever those are smirk) and that many lines were searched to a depth of 15. While not the same as Deep Thought of 1989, I have seen it as searching 11 and 12 Ply against Kasparov. At a rate of 2,160,000Nodes per second it says that DT looked between 200 and 500Million positions per move, which is impossible considering it was Game in 90 and for Game 1 and according to the book after the game DT had 20minutes remaining on it's clock. The game lasted 52moves which give or take puts it at 80 seconds spent per move. As i am writing this i am realizing that it was most likely using Kasparov's Time as well so to factor that in...he used 80 minutes or 92 seconds for each of his moves. Tops 172seconds were spent per move for DT at 2.16Mnps 371,520,000Nodes per move. I guess then the book is right but anyhow this isn't the question. I let Hiarcs7.32 sit for white to move move 36 to try and compare depth, you need just under 19minutes to reach 12Ply complete for move 36 of Kasparov-Deep Thought at 102Knps. with a 7Ghz machine you should get it in 2minutes 30sec at 816Knps. If Deep Thought was searching 2.16Mnps and 200-500M per position it should take 33minutes on my computer to reach just over 200M and 82minutes to 500M.13/31 Ply and 219Million nodes later and still judged as Bh6 instead of Qd1 and = at 0.00 which is not the case. Or is an 15 Ply Search by Hiarcs the equivalent of a 11 Ply search by DT? Also if DT in 1988 looked at 10 but usually 15, DT in 1989 at 11 or 16Ply really is a 15 and 20Ply search by Hiarcs is needed??? How about for Fritz, Junior, Nimzo, Crafty or LG2000v29a??
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