7. Garry Kasparov – 190 IQ He is a chess grandmaster from Russia who became the youngest undisputed world champion when he was 22 years old. He beat the then-champion Anatoly Karpov after a grueling duel in 1985.
Kasparov was recognized as the “classical” world champion until 2000, when he as defeated by Vladimir Kramnik. Still, he holds the record for the longest reign at number one.