Queen's pawn game - Rubinstein (Colle-Zukertort) variation
1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 c5 5. b3
White pushes the queen's pawn to d4. Black plays the queen's pawn to d5. White develops the knight to f3.
Black develops the knight to f6. White pushes the king's pawn to e3. Black pushes the king's pawn to e6.
White develops the light-squared bishop to d3. Black advances the c-pawn to c5. White pushes the b-pawn to b3.