The Lopez Opening arises after 1.e4 e5 2.c3. ECO code: C20.
White plays 2.c3, preparing d4 to establish a broad pawn centre. This is actually the Saragossa Opening-like approach applied in the Open Game. After 2...d5 or 2...Nf6, the resulting positions can be playable for White, though the game often transposes into Danish Gambit or Ponziani-like structures.