Philidor - Lopez counter-gambit - Jaenisch variation
1. e4 e5 2. Nf3 d6 3. Bc4 f5 4. d4 exd4 5. Ng5 Nh6 6. Nxh7
White plays the king's pawn to e4. Black advances the king's pawn to e5. White develops the knight to f3.
Black advances the queen's pawn to d6. White develops the light-squared bishop to c4. Black plays the f-pawn to f5.
White advances the queen's pawn to d4. Black captures on d4 with the king's pawn. White moves the knight to g5.
Black develops the knight to h6. White captures with the knight on h7.