Fisher vs Deep Blue
Time-machined prime Fischer?
Based on Fischer's track record of accusing various human opponents and organizations of cheating, he probably ends up accusing IBM of giving Deep Blue human assistance. It looks a bit like Kasparov's conspiracy theories, but moreso.
Unlike Kasparov, though, Fischer demonstrated a spectacular willingness to walk away from important matches. The match would probably end in meltdown. Fischer angrily quits after a series of confrontations with IBM about everything from their failure to release computer logs, to the way that Deep Blue was off limits behind locked doors, to its frequent crashes and reboots, to Bobby's suspicions that his own room is being bugged, to assorted other cheating allegations. IBM loses lots of money. The public is somewhat more tolerant of Bobby quitting than they would have been with Kasparov, since Fischer had a long history of that kind of thing, so he comes out of the debacle in better shape than IBM.
This question is strictly hyperthetical, but taking into consideration the Great Bobby Fisher's playing style, do you think he could have beat Deep Blue?