White's queen bishop has moved to a3 in what is sometimes called an "extended" fianchetto. Rather than control the long diagonal, it takes aim at Black's f8-square. If Black moves his e-pawn, White can play Bxf8, after which Black will have to waste on artificial castling after recapturing with his king. This tactic is often seen in the Evans Gambit and gives the Benko Gambit much of its bite. Black often plays ...Ba6 in the French Defence, and the Queen's Indian Defence if White plays g3 in order to fianchetto his own bishop (Aron Nimzowitsch's move against the classical main line).