Garry Kasparov is a chess legend known worldwide for his beautiful attacking style and ruthless technique. Kasparov became the youngest ever undisputed World Chess Champion in 1985 at age 22 by defeating then-champion Anatoly Karpov. As world champion, he was known for his aggressive attacking style. In 1996 and 1997, Kasparov played the IBM supercomputer, Deep Blue, in a series of highly publicized matches. From 1986 until his retirement in 2005, Kasparov was ranked World No. 1 and is considered by many to be the greatest chess player in history.