King's Gambit Declined - Nimzovich counter-gambit
1. e4 e5 2. f4 d5 3. exd5 c6
White advances the king's pawn to e4. Black advances the king's pawn to e5. White moves the f-pawn to f4.
Black advances the queen's pawn to d5. White captures on d5 with the king's pawn. Black pushes the c-pawn to c6.