QP counter-gambit - Maroczy gambit
1. e4 e5 2. Nf3 d5 3. exd5 Bd6
White plays the king's pawn to e4. Black advances the king's pawn to e5. White develops the knight to f3.
Black pushes the queen's pawn to d5. White captures on d5 with the king's pawn. Black develops the dark-squared bishop to d6.