King's Indian - Danube gambit
1. d4 Nf6 2. c4 g6 3. d5 b5
White advances the queen's pawn to d4. Black develops the knight to f6. White plays the c-pawn to c4.
Black pushes the g-pawn to g6. White plays the queen's pawn to d5. Black advances the b-pawn to b5.