The first modern rating system was used by the Correspondence Chess League of America in 1939. The Elo rating system is currently the most widely used. The magnitude of the change depends on the rating of their opponents. In general, players' ratings go up if they perform better than expected and down if they perform worse than expected. In almost all systems, a higher number indicates a stronger player. Popular online chess sites such as, Lichess, and Internet Chess Club also implement rating systems.
Most of the systems are used to recalculate ratings after a tournament or match but some are used to recalculate ratings after individual games. 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. System used in chess to estimate the strength of a playerĪ chess rating system is a system used in chess to estimate the strength of a player, based on their performance versus other players.
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