Boden-Kieseritsky gambit - Lichtenhein defence
1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Nf3 d5
White advances the king's pawn to e4. Black advances the king's pawn to e5. White develops the knight to c3.
Black develops the knight to f6. White develops the light-squared bishop to c4. Black captures with the knight on e4.
White transfers the knight to f3. Black moves the queen's pawn to d5.