Archive for July 23rd, 2021

July 23, 2021

Glicko Score

Elo rating system

The Glicko rating system and Glicko-2 rating system are methods for assessing a player’s strength in games of skill, such as chess and Go. It was invented by statistician Mark Glickman as an improvement on the Elo rating system, and initially intended for the primary use as a chess rating system. Glickman’s principal contribution to measurement is ‘ratings reliability,’ called RD, for ratings deviation.

Both Glicko and Glicko-2 rating systems are under public domain and found implemented on game servers online (like Pokémon Showdown,, Counter Strike: Global Offensive, Team Fortress 2, and competitive programming competitions. The formulas used for the systems can be found on the Glicko website.

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