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Continue to ChatThe greatest development after age 21 was shown by Steinitz, who increased his rating by more than a full class interval. Steinitz was the deep student and fierce competitor to the end of his career. - Arpad Elo from https://whatsmyquote.com/quote/the-greatest-development-after-age-21-was-shown-by-steinitz-who-increased-his-rating-by-more-than-a-full-class