Gruenfeld - Gruenfeld gambit
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O
White plays the queen's pawn to d4. Black develops the knight to f6. White plays the c-pawn to c4.
Black moves the g-pawn to g6. White develops the knight to c3. Black pushes the queen's pawn to d5.
White develops the dark-squared bishop to f4. Black develops the dark-squared bishop to g7. White plays the king's pawn to e3.
Black castles kingside.