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Arpad Elo was a master-level chess player and an active participant in the United States Chess Federation (USCF) from its founding in 1939. [3] The USCF used a numerical ratings system, devised by Kenneth Harkness , to allow members to track their individual progress in terms other than tournament wins and losses. The Harkness system was reasonably fair, but in some circumstances gave rise to ratings which many observers considered inaccurate. On behalf of the USCF, Elo devised a new system with a more sound statistical basis.


Lol matchmaking normal

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