>When Kasparov lost to Deep Blue, he was very salty and accused IBM of cheating
The accusation was that IBM made modifications to Deep Blue between games. That's not cheating but then it's not exactly Deep Blue vs Kasparov anymore.
There was a somewhat veiled accusation that there was human intervention in game 2 (as in, a strong human player interceded to influence or outright override the computer's move). Funny that in those days the cheating accusation involved a human behind the scenes instead of a computer.
The accusation was that IBM made modifications to Deep Blue between games. That's not cheating but then it's not exactly Deep Blue vs Kasparov anymore.