Gruenfeld - Three knights variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7
White advances the queen's pawn to d4. Black develops the knight to f6. White moves the c-pawn to c4.
Black moves the g-pawn to g6. White develops the knight to c3. Black moves the queen's pawn to d5.
White transfers the knight to f3. Black develops the dark-squared bishop to g7.