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The Elo rating system is a method for calculating the relative skill levels of players in two-player games such as chess and Go. Elo is often written in capital letters (ELO), but it is not an acronym. It is the family name of the system's creator, Arpad Elo (1903â1992), a Hungarian-born American physics professor. Elo was originally invented as an improved chess rating system although it is used in many games today.
World of Warcraft formerly used the Elo rating system when teaming up and comparing Arena players, but now uses a system similar to Microsoft's TrueSkill. Counter Strike: Global Offensive uses the Elo system in its competitive matchmaking where players earn points by winning matches to increase their skill level. The MOBA game League of Legends used an Elo rating system prior to the second season of competitive play.