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  15... f6e4  16. c3e4  16... b7e4  17. c2e4  17... d7f6  18. e4c2 Something has gone wrong with Black's preparation, as White has a comfortable small advantage without any risk, the dream of theoretical preparation in an elite game. 18... d8b6 This allows White to place the queen in a good position to attack the weak h4-pawn. 19. c2a4  19... a5d2  20. d1d2 Now it's difficult for Black to defend h4 without making big concessions. The c5-pawn is also a target. 20... a8d8  21. d2c2  21... b6b7 Now Black simply loses a pawn. 22. c4e2  22... b7e4 Otherwise the pawn on h4 is captured. 23. c2c4  23... e4f5  24. a1c1  24... d8d2  25. c4c5  25... e6e5  26. c5c2 White has stabilized his position and has a winning advantage with an extra pawn and bishop versus knight. 26... f8d8  27. a4a5 The most clear-cut. 27... f6e4  28. e2f3 Everything is protected. 28... d8d6  29. a5b4  29... d2c2  30. c1c2  30... e4g5  31. b4d6 