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Achievement Hunter was an American video gaming division of Rooster Teeth Productions. Founded by Geoff Ramsey and Jack Pattillo on July 6, 2008, the website was originally based on the achievement mechanic in video games but grew to become a core component of Rooster Teeth, hosting a wide variety of videos related to video games.
The most well known statistical method was devised by Arpad Elo in 1960 and elaborated on in his 1978 book The Rating of Chessplayers, Past and Present. [1] He gave ratings to players corresponding to their performance over the best five-year span of their career.