To understand the Trench you have to understand how matchmaking works in Dota 2. Valve determines your relative Matchmaking Rank MMR by assigning points to you whenever you play a game. There are exceptions, but usually when you win, you gain points, and when you lose, you lose points. The matchmaking will attempt to match you with players who share a relatively close MMR.
New Dota 2 matchmaking update focuses on high-level players and those in groups
The update adds a new rule that any group with a player at Immortal rank or above will have every player treated as the same rank as the highest-ranked player. In light of the changes to party matchmaking mentioned above, Valve has reduced the acceptable MMR spread within a party from to to make it easier for groups with high MMR disparities to find compatible opponents. The reduction in acceptable MMR spread is only applicable to ranked matchmaking however, as Valve admits they are still tweaking the system. Another big change coming with the update is a stricter ruleset for matchup combinations between parties and solo players. Five-stacks will now only be matched against other five-stacks, while solo players will only face off against either a full team of solo players or a party of two alongside three solo players. Ranked medals have also been changed, with the number of stars shown for each medal reverted to five from seven. With this change, the MMR range for each medal has been rebalanced.
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Seasonal Rankings represent the level of skill a player achieves in a single season, as determined by their matchmaking rating MMR and other hidden factors. It is only available for ranked matches. Medals are reset at the end of each season.