King's Gambit Declined - classical - Marshall attack
1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 Bg4 5. fxe5 dxe5 6. Qa4+
White pushes the king's pawn to e4. Black plays the king's pawn to e5. White advances the f-pawn to f4.
Black develops the dark-squared bishop to c5. White develops the knight to f3. Black pushes the queen's pawn to d6.
White moves the c-pawn to c3. Black deploys the light-squared bishop to g4. White captures on e5 with the f-pawn.
Black captures on e5 with the queen's pawn. White places the queen to a4, giving check.