Deep Blue won its first game against Gary Kasparov on the 10th February 1996, when it defeated him in game one of a six-game match. However, Kasparov won three and drew two of the following five games, defeating Deep Blue by a score of 4–2. Deep Blue was then heavily upgraded, and played Kasparov again in May 1997. Deep Blue won game six, therefore winning the six-game rematch and becoming the first computer system to defeat a reigning world champion in a match under standard chess tournament time controls. Kasparov accused IBM of cheating and demanded a rematch however, IBM refused this request and retired Deep Blue.
Deep Blue, with its capability of evaluating 200 million positions per second, was the fastest computer that ever faced a world chess champion.
The Deep Blue project inspired a more recent grand challenge at IBM: building a computer that could beat the champions at a more complicated game, Jeopardy!.