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09/11/1985 Garry Kasparov becomes the youngest World Chess Champion

At the time of the match, Karpov had a FIDE rating of 2720, while Kasparov had a rating of 2700. Karpov was 34 years old, which made him 12 years older than Kasparov. Because of the time pressure, Karpov made a decisive error on move 36. Subsequently, Kasparov won the World Championship after Karpov resigned on move 42.