A/B testing matchmaking when a match spans both arms
InterferenceHardProblem. You want to A/B test a matchmaking change (say, tighter skill matching). But a single match contains 10 players who might be in different arms, and one player's match quality depends on the other nine. How do you run it?
Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.