"Ranked Duo Queue
We're introducing a new restriction for ranked duo queues so players can only duo queue with teammates ranked within one full tier above or below them. We found that the vast majority of duos are already between players within these thresholds and this change will allow us to curb some of the potential abuse cases we see under the current matchmaking system.
In the case of unseeded players, the new system allows for duo queuing with Gold, Silver and Bronze players while their skill level is still being assessed. After they've been placed, the usual restrictions will apply.
Players may only queue for ranked duo games with players ranked within one full tier above or below them. For example, a Silver III player may duo with players ranked anywhere from Bronze V to Gold I.
Unseeded players who were ranked in solo queue during the previous season will use that rank to determine duo eligibility.
Unseeded players who have never been ranked in solo queue are able to duo queue with Gold, Silver or Bronze players."
