Master can duo. Grandmaster and Challenger cannot. That is the LoL Master duo queue rule in two sentences, and it is where most pages stop explaining. Master players queue as a pair against similarly ranked opponents, the two Apex tiers above them stay solo-only, and the restriction runs on hidden MMR rather than the badge on your profile. Below that sits a whole staircase of tier-gap rules nobody bothers to write out. So here they are, tier by tier, along with what duoing actually does to your LP.<\/p>\n
We boost League accounts across every division, so we queue inside these restrictions daily and watch the client grey the button out for reasons players find baffling. If you want the tiers themselves rather than the party rules, the full Iron-to-Challenger ladder<\/a> covers those.<\/p>\n