Scandinavian gambit
1. e4 d5 2. exd5 Nf6 3. c4 c6
White moves the king's pawn to e4. Black plays the queen's pawn to d5. White captures on d5 with the king's pawn.
Black develops the knight to f6. White plays the c-pawn to c4. Black pushes the c-pawn to c6.