Deep Blue versus Garry Kasparov was a pair of six-game chess matches between then-world chess champion Garry Kasparov and an IBM supercomputer called Deep Blue. Kasparov won the first match, held in Philadelphia in 1996, by 4–2. Deep Blue won a 1997 rematch held in New York City by 3½–2½. The second match was the first defeat of a reigning world chess champion by a computer under tournament conditions, and was the subject of a documentary film, Game Over: Kasparov and the Machine.

Source: Wikipedia