The reason Kasparov hinted at cheating was that he had the measure of Deep Blue. When it played the random move it did something that fell outside of what he ha

The reason Kasparov hinted at cheating was that he had the measure of Deep Blue. When it played the random move it did something that fell outside of what he had learned to except. Hence, either IBM cheated by making a move for the computer or it was showing human intuition. It was pure coincidence that the move was actually better than what it's algorithm would have chosen but Kasparov wasn't to know that. It broke his composure and concentration and the match was lost.