Question

You must win a game by at least 2 points true or false
Tennis

Answer 1

Generally true. In standard tennis scoring you must win a game by at least two points (you need at least 4 points and a 2‑point margin, e.g. win after Advantage). Exception: some formats use "no‑advantage" (no‑ad) scoring where a single deciding point is played at deuce, so a game can be won by one point in those events.