The Rossolimo variation with the move 3...g6 is a way to respond to g6. The main idea is to quickly develop the kingside with moves like ...g6, ...Bg7, and castling, creating a fianchettoed bishop to control the center and protect the king. A key goal for Black is to later look for opportunities to gain counterplay, often by maneuvering a knight to the d4 outpost or creating queenside pressure with pawn advances like ...a5.

1.e4 c5 2.Nf3 Nc6 3.Bb5 g6