Author: Jeremiah Penery
Date: 00:22:56 01/20/00
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On January 20, 2000 at 02:18:51, Ed Schröder wrote: >On January 19, 2000 at 18:55:42, Dann Corbit wrote: > >>On January 19, 2000 at 18:34:52, blass uri wrote: >>[snip] >>>The question is if the move of deeper blue was the right move. >>>It is not clear that 36.axb5 was the right move. > >>So the argument against 36.axb5 was that it is not such a good move? >>Every program has bugs. There are a very large number of tunable parameters >>with the deep blue machine. Perhaps one (or many) of them was not optimal. > >You misunderstand. It's the DB main-line for 36.axb5 what made Kasparov >suspicious. In this main-line DB sacrificed 3 pawns for no direct win >but for a dangerous looking king attack, all very human-like. Kasparov >could not believe his eyes (he still can't) and started the accusation >human intervertion took place as he could not believe a computer was >able to produce such a (super) main-line. > >So this whole issue is NOT about the move 36.axb5 but about the asthonising >main-line DB produced. I think it depends completely on the evaluation, specifically the king-safety evaluation. From looking at the log files, it seems that DB evaluated king-safety much differently than most (all?) other computers. [I could be wrong here - I'm basing this by the fact that the last move of many of the PVs it gives were strange looking moves that seem to lose material to open lines on one of the kings, like in this PV from move 37 of game 2: Be4 Rcb8 g3 Qd8 Ra6 Rxa6 Rxa6 Bc7 Rxf6.] It may also have been asymmetrical, valuing its own king-safety higher than the opponent's. Certain modified Crafties I've produced will play axb5. Some of them will play it right away, and some will switch from Qb6 after a deep search. One in particular I remember liked Qb6 for a long time (15 ply, IIRC), then produced a line _very_ similar to the one DB produced for that move. It switched to axb5 before the next ply, just as DB did. I think I'll go back and analyze again the line DB gave for move 36. Qb6, to see if white could get improve on it and get better than a draw. Jeremiah
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