King's Gambit Declined - Falkbeer - Nimzovich variation
1. e4 e5 2. f4 d5 3. exd5 e4 4. Bb5+
White moves the king's pawn to e4. Black pushes the king's pawn to e5. White moves the f-pawn to f4.
Black pushes the queen's pawn to d5. White captures on d5 with the king's pawn. Black advances the king's pawn to e4.
White develops the light-squared bishop to b5, giving check.