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The latest update for Dota 2 targets the game's matchmaking system, something that has been a point of much angst among the community. Seriously, just look at this positivity even over on Reddit.

The main highlights include the return of the solo queue, you must register a number to play ranked, there are now bans from ranked games, bot accounts were hit with a permanent ban wave, and more. This also includes
LINKED PHONE NUMBER
The first major change is that players must register a unique phone number to their account in order to queue for Ranked matches.

Players using multiple accounts create a negative matchmaking experience at all skill brackets, so our goal is to add just enough friction to this process that the number of players doing this will be noticeably reduced. Having more players using their primary accounts will have a positive effect on both Ranked and Unranked Matchmaking.

There will be a two-week grace period from today during which players have time to register a number, but starting on May 4th, accounts without a registered number will no longer be eligible for Ranked play. If a phone number is removed from an account after registration, a new number can be added, but there will be a three-month waiting period before the removed number can be registered on a new account. This is to prevent using the same number on multiple accounts. Online services that provide phone numbers are not allowed.

SOLO QUEUE
With the return of the Solo Queue, solo players who enter Ranked Matchmaking can now choose to be matched only with other solo players. Any player who selects this option will be placed into matches where all ten players are queuing solo.

PARTY CHANGESMATCHMAKING BEHAVIORREGIONAL CHANGES
Ranked Matchmaking will no longer be available in South Africa, India, and Dubai. We will update these servers as the unranked populations in these regions grow to the critical mass needed to be able to support splitting the user base into Ranked and Unranked queues.

While there are some players that used these servers for Ranked, the low populations made them prime targets for various Ranked Matchmaking abuses. For the time being, players in these regions will need to join Ranked Matchmaking queues in one of the other nearby supported servers.