IBM's Watson computer system, powered by IBM POWER7, competes against Jeopardy's two most successful and celebrated contestants — Ken Jennings and Brad Rutter — in a practice match held during a press conference at IBM's Watson Research Center in Yorktown Heights, N.Y. on Jan. 13, 2011. Watson will compete against Jennings and Rutter in the first-ever man versus machine Jeopardy competition, which will air on Feb. 14, 15 and 16, 2011, with two matches being played over three consecutive days.