Groups comparison

Matchmaking Rating(MMR;Elo rating system) - 1998 to 2016
Uses any kind of matchmaking rating system to calculate relative skill of players, usually to match relatively similarly skilled people against each other in multiplayer. May use variables besides those signifying skill to match people.

Multiplayer: Matchmaking - 2006 to 2017
Offers matchmaking service for multiplayer, finding opponents of presumably equal skill level when available so both/all players have equal chance of winning.

matchmakingrating
mp-matchmaking
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