Deep Blue versus Garry Kasparov normal chess tournament conditions, and in particular, time controls. "February 11". The second game began with the Open Catalan Opening. Kasparov played in what could be called a preemptive style blocking all Deep Blue's attempts. The game lasted for 73 moves but eventually Deep Blue's operator had to resign the game for the computer in a position where both players had a bishop but Kasparov had three pawns to Deep Blue's one. "February 13". In the third game Kasparov played the Sicilian Defence to which Deep Blue responded with the Alapin Variation. The game lasted for 39 moves and was
Deep Blue versus Garry Kasparov to exchange the queens. That would have allowed his pawn, which was about to promote, to advance. "May 3". The 1997 rematch began with the King's Indian Attack, which led Kasparov to victory in 45 moves. Deep Blue's 44th move in this game puzzled Kasparov, and he attributed it to "superior intelligence". Allegedly, the move was a result of a bug in which Deep Blue, unable to determine a desirable move, resorted to a fail-safe. Nate Silver proposes that Kasparov "concluded that the counterintuitive play must be a sign of superior intelligence", leading him to lose the second game. "May