Robatsch defence - Rossolimo variation
1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c4 Bg4
White pushes the king's pawn to e4. Black plays the g-pawn to g6. White pushes the queen's pawn to d4.
Black develops the dark-squared bishop to g7. White develops the knight to f3. Black pushes the queen's pawn to d6.
White plays the c-pawn to c4. Black deploys the light-squared bishop to g4.