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. 10. f1c4  10... b6c5  11. e1g1 White has a better pawn structure, with two islands to Black's three. This is compensated by piece activity. 11... b8d7  12. d1c2  12... c8b7  13. f1d1  13... h7h5 Up to now So has blitzed his moves. This move is certainly not forced, but it's an interesting choice approved by the computer. 14. h2h3 A new move and a logical one. 14... h5h4 After playing the pawn to h5 there's nothing more natural than advancing it to h4. I'm not sure, however, that this is the most accurate move. 15. g3e4 