Philidor - Boden variation
1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Qxd4 Bd7
White plays the king's pawn to e4. Black plays the king's pawn to e5. White develops the knight to f3.
Black plays the queen's pawn to d6. White moves the queen's pawn to d4. Black captures on d4 with the king's pawn.
White captures with the queen on d4. Black develops the light-squared bishop to d7.