How a random bug in Deep Blue may ultimately have led to Kasparov's defeat
> Kasparov had concluded that the counterintuitive play must 
  be a sign of superior intelligence. He had never considered
  that it was simply a bug.I think this says quite a bit about chess as a game.That a top player can't recognize a bad move near the final stage of the game.In contrast, the game of Go is rich with examples where one player makes a bad move and the opponent takes advantage of it; and I'm talking about top players; not amateurs.Following the opponent and/or always responding to his moves is considered a typical sign of a weak player. One of the things you learn as you get better is to never assume that the last move of your opponent is necessarily a good move.Imagining that your opponent has a threat you haven't yet figured out is one of the bad habits that weak players must get rid of before they can become stronger.