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Garry Kasparov is alleged to have an IQ of 190.
Kasparov has totally amazed the world, when he played to a draw against a chess computer that could calculate three million positions per second in 2003. He is a chess grandmaster from Russia. At the age of 22, he became the youngest undisputed world champion by defeating then-champion Anatoly Karpov.
https://www.wonderslist.com/10-most-intelligent-people/