Queen's Indian - Marienbad system - Berg variation
1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5 5. c4 cxd4 6. Qxd4
White plays the queen's pawn to d4. Black develops the knight to f6. White develops the knight to f3.
Black moves the b-pawn to b6. White moves the g-pawn to g3. Black develops the light-squared bishop to b7.
White develops the light-squared bishop to g2. Black advances the c-pawn to c5. White advances the c-pawn to c4.
Black captures on d4 with the c-pawn. White captures with the queen on d4.