"I've always wondered if his tactics of not showing up for matches against the Russian masters was just some delusional zone-out or something."
I still wonder if Deep Blue or its programmers could ever account for the unpredictability of Fischer's apparent insanity. Granted there are a finite number of possible moves on a chess board, but Deep Blue's computational capabilites, immense as they are, have to have some ultimate outer limit. Could the biochemical dysfunction of Fischer's "wiring" possibly result in a capability that is just sufficiently enough greater than Deep Blue to allow him to win?
I'm guessing Deep Blue doesn't attempt to assign probabilities to an opponent's moves. So a wacko response would be no less expected than a logical one.