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A chess rating system is a system used in chess to estimate the strength of a player, based on their performance versus other players. They are used by organizations such as FIDE , the US Chess Federation (USCF or US Chess), International Correspondence Chess Federation , and the English Chess Federation .
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.
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.
The Universal Rating System (URS) is a system for rating chess players devised by Jeff Sonas, Mark Glickman, J. Isaac Miller and Maxime Rischard. It was introduced to determine seedings and qualifications for the 2017 Grand Chess Tour .
The USCF initially aimed for an average club player to have a rating of 1500 and Elo suggested scaling ratings so that a difference of 200 rating points in chess would mean that the stronger player has an expected score of approximately 0.75. A player's expected score is their probability of winning plus half their probability of drawing. Thus ...
Every time a tournament chess player plays a game, their rating goes up or down depending on the game's outcome and on how strong their opponent is. If the rating of a chess expert falls below 2000, they are not a chess expert any more (though they retain the title of Candidate Master, if it was earned according to the criteria above).
Chess players ordered by peak FIDE rating in 1980s Country Player Peak rating in 1980s Achieved 1 Garry Kasparov: 2775 1989-01 2 Anatoly Karpov: 2755 1989-07 3 Mikhail Tal: 2705 1980-01 4 Viktor Korchnoi: 2695 1980-01 5 Jan Timman: 2675 1988-01 6 Nigel Short: 2665 1988-07 7 Artur Yusupov: 2660 1986-07 Vasyl Ivanchuk: 2660 1989-07 9 Lajos ...
In the formula above E is the ECF rating (not Elo) and F is the FIDE rating. The ECF grading system was recalibrated in 2009. Various other conversion formulae have been used, but usually relate to the forerunner. This grades some games outside Federation matches where opponents lack an ECF grade. It is designed to give a best estimate conversion.