### ELO rating system

The Elo rating system is a method for calculating the *relative skill levels* of players in two-player games.

Each player has a rating, which is a number. A higher number indicates a better player, based on results against other rated players.

The winner of a contest between two players gains a certain number of points in his or her rating and the losing player loses the same amount.

The number of points won or lost in a contest depends on the difference in the ratings of the players.

A player will **gain more points by beating a higher-rated player than by beating a lower-rated player**.

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