The KGD – Mafia Defence arises after 1.e4 e5 2.f4 c5. ECO code: C30.

An unusual decline where Black plays ...c5, a Sicilian-like move, ignoring the f4-pawn. The idea is to keep the centre closed and avoid the tactical complications of accepting the gambit. White can play d4 or fxe5. The position is playable but uncommon.