Arpad Elo

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Arpad Emre Elo, born 25 August 1903, developed the Elo Rating System in 1959 at the request of the [ext] US Chess Federation. The Elo Rating System was adopted by the [ext] World Chess Federation (FIDE) in 1970. Later (date needed), the USCF modified the Elo rating system to use a slightly different model for the variability in a player's performance substituting one based upon the [ext] logistic distribution in place of Elo's selected [ext] normal distribution.

In 1978, Elo published The Rating of Chessplayers, Past and Present, a book describing his system and presenting ratings for 476 of the world's strongest chessplayers.

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