Centre game - Hall variation
1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qc4
White plays the king's pawn to e4. Black pushes the king's pawn to e5. 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 knight to c6.
White deploys the queen to c4.