Question: how many mmr per game?
Answer: For example, a player at around the 6,000 MMR range would, more often than not, gain 10 MMR for winning a ranked match but have 40 MMR shaved off after a loss. With the latest matchmaking update, winning a ranked match will now give players 30 MMR if they queued solo and 20 MMR if they queued with a party.