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The current ranking system in Dota 2, which was released in 2017 was a huge upgrade from its previous version. Matchmaking Rank or MMR is a numerical score that reflects your rank and basically says how good you are overall. The 2013 analysis conducted by Valve showed that players with 4000+ MMR ranked in the 99th percentile, meaning that they are better than 99% of the total population playing Dota 2. There are now a total of eight tiers a player can climb in the new and upgraded ranking system.