Scotch - Relfsson gambit ('MacLopez')
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bb5
White moves 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 pushes the queen's pawn to d4. Black captures on d4 with the king's pawn.
White develops the light-squared bishop to b5.