Four knights - Bardeleben variation
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nxe5 7. d4 Bd6 8. f4 Nc6 9. e5 Bb4
White pushes the king's pawn to e4. Black advances the king's pawn to e5. White develops the knight to f3.
Black develops the knight to c6. White jumps the knight to c3. Black transfers the knight to f6.
White develops the light-squared bishop to b5. Black develops the dark-squared bishop to c5. White castles kingside.
Black castles kingside. White captures with the knight on e5. Black captures with the knight on e5.
White pushes the queen's pawn to d4. Black deploys the dark-squared bishop to d6. White advances the f-pawn to f4.
Black jumps the knight to c6. White pushes the king's pawn to e5. Black places the dark-squared bishop to b4.