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Is it true that there is a hidden matchmaking system that separates players into three groups, one composed of people identified by Riot as toxic, a normal one and one composed of friendly people ?

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over 1 year ago - /u/Auberaun - Direct link

no this is not true, everyone is in the same matchmaking pool, matchmaking uses MMR exclusively in all queues except for pre-level 30 where it will also try to group players based on account level