Wikipedia:

Deep Blue versus Garry Kasparov was a pair of famous six-game human–computer chess matches, in the format of machine and humans, versus a human. In this format, on the machine side a team of chess experts and programmers manually alter engineering between the games.

The matches were played between the IBM supercomputer Deep Blue with a team of IBM programmers and chess experts who directed and reprogrammed the machine between games on the one side, and theWorld Chess Champion Garry Kasparov on the other side.

The first match was played in February 1996 in Philadelphia, Pennsylvania. Kasparov won the match 4–2, losing one game, drawing in two and winning three.

A rematch was played in 1997 – this time Deep Blue won 3½–2½.