1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... c7c5  5. g1e2  5... d7d5 This is one of the many possible plans for Black in the Nimzo-Indian with 4.e3. One of the attractions of this defense is the flexibility of choice for both sides. 6. a2a3  6... b4a5  7. d4c5  7... d5c4  8. c1d2  8... e8g8  9. e2g3  9... b7b6 An accurate reply. If White captures on b6 then Black can protect the pawn with Ba6, acquiring excellent compensation.