TrueSkill is a Bayesian ranking algorithm developed by Microsoft Research and used in the Xbox matchmaking system built to address some perceived flaws in the Elo rating system. It is an extension of the Glicko rating system to multiplayer games.

TrueSkill maintains a belief on the skill of each player; every time a player plays a game, the system accordingly changes the perceived skill of the player and acquires more confidence about this perception.

Read more about TrueskillCalculation, Use in Other Projects, See Also

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Gamertags - User Information - TrueSkill
... TrueSkill is a ranking and matchmaking system which was first implemented as part of the Xbox 360's Live services ... Microsoft Research Cambridge (United Kingdom), the TrueSkill ranking system is now used in over 150 titles for the Xbox 360 and in the Games for Windows – Live game Warhammer 40,000 ... alternate account(s) and system flaws where each system has its own individual TrueSkill rating ...