Normal game matchmaking is stupidly broken: leagueoflegends.
MMR goes up when you win and down when you lose (see the section above on accuracy for caveats). As such, the most straightforward way to gain MMR is to maintain a positive win rate. Although the difference between your team and the opposing team’s average MMR affects the amount gained or lost, in practice most games are “fair” and contain teams with similar MMR. A good rule of thumb is.
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