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  2. Chess rating system - Wikipedia

    en.wikipedia.org/wiki/Chess_rating_system

    A chess rating system is a system used in chess to estimate the strength of a player, ... the formula ELO = (ECF * 7.50) + 700 was sometimes used. [7] Elo rating system

  3. Elo rating system - Wikipedia

    en.wikipedia.org/wiki/Elo_rating_system

    Arpad Elo was a chess master and an active participant in the United States Chess Federation (USCF) from its founding in 1939. [4] The USCF used a numerical ratings system devised by Kenneth Harkness to enable members to track their individual progress in terms other than tournament wins and losses.

  4. Performance rating (chess) - Wikipedia

    en.wikipedia.org/wiki/Performance_rating_(chess)

    Performance rating (abbreviated as Rp) in chess is the level a player performed at in a tournament or match based on the number of games played, their total score in those games, and the Elo ratings of their opponents. It is the Elo rating a player would have if their performance resulted in no net rating change. Due to the difficulty of ...

  5. Arpad Elo - Wikipedia

    en.wikipedia.org/wiki/Arpad_Elo

    Elo is known for his chess player rating system. The original player rating system was developed in 1950 by Kenneth Harkness, the Business Manager of the United States Chess Federation. By 1960, using the data developed through the Harkness Rating System, Elo developed his own formula which had a sound statistical basis and constituted an ...

  6. Comparison of top chess players throughout history - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_top_chess...

    In 1970, FIDE adopted Elo's system for rating current players, so one way to compare players of different eras is to compare their Elo ratings. The best-ever Elo ratings are tabulated below. As of September 2023, there are 133 chess players in history who broke 2700, and 15 of them exceeded 2800.

  7. United States Chess Federation - Wikipedia

    en.wikipedia.org/wiki/United_States_Chess_Federation

    USCF first instituted a rating system for over-the-board play in 1950, using a calculation formula devised by Kenneth Harkness. In 1960, the USCF adopted a more reliable rating system invented by Arpad Elo, a college professor of physics who was a chess master. Elo worked with USCF for many years.

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  9. FIDE rankings - Wikipedia

    en.wikipedia.org/wiki/FIDE_rankings

    The International Chess Federation (FIDE) governs international chess competition. Each month, FIDE publishes the lists "Top 100 Players", "Top 100 Women", "Top 100 Juniors" and "Top 100 Girls" and rankings of countries according to the average rating of their top 10 players and top 10 female players in the classical time control.