Four knights - Scotch - Krause variation
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 Bb4 5. Nxe5
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 transfers the knight to c3. Black transfers the knight to f6.
White moves the queen's pawn to d4. Black develops the dark-squared bishop to b4. White captures with the knight on e5.