I just want to make sure I'm reading this correctly. Can you only get chests from PREMADE games? Or purchase them with RP of course. So just joining a normal Draft Ranked game won't earn a chest. Also do you only get a chest if the person you joined the premade with gets an S-, S, S+? Or anyone in the team?
Keys are from 'matchmade' games... what is this? Is this any game where you don't have a premade? Or where part of your party is not premade?
You can get chests in any game that has champion mastery. Currently that is Normal and Ranked games on Summoner's Rift. You do not have to be premade with anyone to get chests. The only requirement is that you (or someone in your premade group) get an S+, S or S- rank with their champ after the game. If you're playing solo, that just means you're going to have to get that S rank yourself.
A matchmade game I think is any game that isn't custom or against bots. It doesn't matter if you're playing solo or with a premade.
You're not reading correctly.
