Nimzo-Indian - 4.e3 - Bronstein (Byrne) variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Nge2 Ba6
White plays the queen's pawn to d4. Black develops the knight to f6. White advances 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 advances the king's pawn to e3. Black moves the b-pawn to b6. White transfers the knight to e2.
Black moves the light-squared bishop to a6.