Four knights - Belgrade gambit
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nd5
White advances the king's pawn to e4. Black plays the king's pawn to e5. White develops the knight to f3.
Black develops the knight to c6. White moves the knight to c3. Black jumps the knight to f6.
White pushes the queen's pawn to d4. Black captures on d4 with the king's pawn. White transfers the knight to d5.