Dutch - Leningrad - main variation
1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3
White advances the queen's pawn to d4. Black pushes the f-pawn to f5. White moves the c-pawn to c4.
Black develops the knight to f6. White advances the g-pawn to g3. Black moves the g-pawn to g6.
White develops the light-squared bishop to g2. Black develops the dark-squared bishop to g7. White develops the knight to f3.