Centre game - l'Hermet variation
1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 f5
White plays the king's pawn to e4. Black plays the king's pawn to e5. White pushes 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 knight to c6.
White places the queen to e3. Black moves the f-pawn to f5.