e/Chess rating systems

Information
has gloss	eng: Chess rating systems are systems used in chess to calculate an estimate of the strength of the player, based on his performance versus other players. They are used by organizations such as FIDE, the US Chess Federation (USCF), International Correspondence Chess Federation, and the English Chess Federation. Most of the systems are used to recalculate ratings after a tournament or match but some are used to recalculate ratings after individual games. In almost all systems a higher number indicates a stronger player. In general, a player's rating goes up if he performs better than expected and down if he performs worse than expected. The magnitude of the change depends on the rating of his opponents. The Elo rating system is currently the most widely-used.
lexicalization	eng: Chess rating systems
subclass of	(noun) instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity; "he bought a new stereo system"; "the system consists of a motor and a small computer" system
has instance	e/de/Ingozahl
has instance	e/de/Nationale Wertungszahl
has instance	e/de/Wertungszahl (Schach)
has instance	e/Chessmetrics
has instance	e/Deutsche Wertungszahl
has instance	e/ECF grading system