King's Gambit Declined - Falkbeer - 4.d3

White plays the king's pawn to e4. Black plays the king's pawn to e5. White plays the f-pawn to f4.

Black advances the queen's pawn to d5. White captures on d5 with the king's pawn. Black plays the king's pawn to e4.

White plays the queen's pawn to d3.