Chess Opening Theory/1. e4/1...e5/2. f4/2...exf4/3. Qf3/3...Qh4

3...Qh4+
Black checks the white king, just how they intended. But fortunately for white, white can play 4. g3 due to the queen on f3 that supports it.

'''1. e4 e5 2. f4 exf4 3. Qf3?! Qh4+'''