1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... b7b6 This is already the second Game of the Day from the Olympiad featuring this variation of the Nimzo-Indian. 5. f1d3  5... c8b7  6. g1e2 An interesting pawn sacrifice that, while not entirely correct (meaning it doesn't give White an advantage if Black accepts it), has some practical value. I remember analyzing these positions extensively about 20 years ago with my coach at the time, GM Gilberto Milos. The computers, of course, found new attacking ideas for White. 6... b7g2 The most principled decision. Of course, playing without accepting the gift is also possible. 7. h1g1  7... g2f3 The best square. 8. g1g3 The best way. 8... b4c3  9. b2c3  9... f3e4  10. d1c2  10... e4d3  11. c2d3 We can pause for a moment to evaluate White's compensation. Apart from the pawn deficit, his remaining pawns are weak. However, his control over the g-file, the strong dark-squared bishop, and the mobile central pawns are enough for balanced chances in a complex position. 11... f6h5 A new move. 12. g3h3  12... g7g6  13. e3e4  13... d7d6  14. e2g3  14... h5g3  15. d3g3  15... f7f6  16. c1h6  16... h8g8 Basically a waste of time since a queen move would help with development while also preventing Bg7. 17. e4e5 White needs to open the game to exploit his development advantage and attack the exposed king. 17... b8d7  18. e1c1  18... d8e7  19. e5f6  19... d7f6 This allows a deadly pin. 20. h6g5  20... f6e4  21. g5e7  21... e4g3  22. f2g3  22... e8e7  23. h3h7  23... e7d8  24. d1f1 Some authors say that doubling rooks on the seventh rank is a good strategy. I tend to agree with them. 24... d8c8  25. f1f7  25... c8b7  26. f7c7  26... b7a6 White has an extra pawn, and the rooks are in an ideal position. Furthermore, White can easily attack the remaining pawns. 27. h7e7  27... g8f8  28. c1b2 White follows the strategy mentioned earlier.