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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.
Elo rating system. Performance rating is a hypothetical rating that would result from the games of a single event only. Some chess organizations use the algorithm of 400 to calculate performance rating. According to this algorithm, performance rating for an event is calculated in the following way: 1  For each win, add your opponent's rating plus 400, 2  For each loss, add your opponent's rating minus 400, 3  And divide this sum by the number of played games.