Nimzo-Indian - Fischer variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6
White advances the queen's pawn to d4. Black develops the knight to f6. White moves the c-pawn to c4.
Black plays the king's pawn to e6. White develops the knight to c3. Black develops the dark-squared bishop to b4.
White pushes the king's pawn to e3. Black moves the b-pawn to b6.