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Learn about the different systems used to estimate the strength of a chess player, based on their performance versus other players. The most widely used system is the Elo rating system, which was invented by Arpad Elo and adopted by FIDE and other organizations.
Elo rating system is a method for calculating the relative skill levels of players in zero-sum games such as chess or esports. It is named after its creator Arpad Elo, a Hungarian-American physics professor, and uses a statistical model based on wins, draws and losses.
Learn about the Glicko and Glicko-2 rating systems, methods of assessing a player's strength in zero-sum two-player games. Find out how they work, how they differ from Elo, and how they are used in various online games and chess.
Learn how to calculate the level a player performed at in a chess tournament or match based on their score and opponents' ratings. Compare different methods, such as the true definition, the linear method and the FIDE method, and see examples and lookup tables.
This web page lists the top 20 rated chess players of all time based on the Elo system, which measures their performance over the best five-year span of their career. It also discusses the challenges and limitations of comparing players from different eras using statistical methods.
The title Grandmaster is awarded to outstanding chess players by FIDE. Apart from World Champion, Grandmaster is the highest title a chess player can attain. In chess literature it is usually abbreviated to GM. The abbreviation IGM for "International Grandmaster" is occasionally seen, usually in older literature.
The Universal Rating System (URS) is a chess rating system that combines all three time controls into a single list. It was introduced in 2017 to determine seedings and qualification for the Grand Chess Tour.
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).
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