1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. d1c2 One of White's most solid options against the Nimzo-Indian. 4... d7d6 Probably an indication that Abdusattorov was playing for a win. In the main variations with 4...0-0, the theory is very developed, and it can be difficult to find an idea to unbalance the game. 5. e2e3  5... e8g8  6. f1d3  6... c7c5  7. g1f3  7... b8c6  8. e1g1  8... b4c3 Usually after castling in these types of positions, it's a good idea for Black to take the knight on c3, since without the pin there's always the risk of the knight coming out and the bishop being badly placed on b4. 9. c2c3  9... d8e7 This is inaccurate. 10. d4c5 I like this decision a lot. White is heading for a position with a small advantage, reducing Black's active possibilities. 10... d6c5  11. f3e5 This is the point of White's previous move: White prevents e6-e5. 11... c6e5  12. c3e5  12... f8d8  13. d3c2  13... f6g4 Abdusattorov tries to gain some activity, but this probably worsens his position. 13...b6 or 13...Bd7 leads to a normal position with a slight but comfortable advantage for White. 14. e5g3  14... e6e5  15. f2f3  15... g4f6  16. b2b3 The pawn on e5 will require protection, and there's also a plan for White with f3-f4 at some point, opening the diagonal for the dark-squared bishop. 16... f6h5  17. g3f2  17... c8d7  18. c1b2  18... d7c6  19. a1d1 Simple play. 19... h7h6  20. h2h3 Both players improve their position slowly. At this point, it seemed that nothing drastic would happen soon, but we're in for a surprise. 20... h5f6  21. f2g3  21... d8d1  22. f1d1  22... a8e8 Protecting the pawn. 23. a2a4 The idea behind this move is probably to anticipate a possible a6-b5 plan by Black. 23... f6h5 The knight isn't doing anything here. 24. g3f2  24... e7g5 A surprising blunder by a player who is usually very alert to tactical details. 25. g2g4 White simply wins heavy material. 25... f7f5 A desperate move. 26. h3h4  26... g5g6  27. c2f5  27... g6f7  28. d1d6 The clearest way to win. 28... h5f6  29. g4g5  29... h6g5  30. h4g5  30... f6h5  31. f5g4 White has many ways of winning. 31... f7e7  32. d6c6 This is a mistake that clearly shows that Arjun is not in good form. 32... b7c6  33. g4h5  33... e7g5  34. h5g4 White is still much better, but suddenly Black has a glimpse of hope. 34... e5e4  35. g1f1 This is already the only move to keep the advantage. 35... g5g6  36. f2c2 Again the best move and not an easy one. 36... e8f8  37. c2g2 White prepares both Be6+ and f3-f4. 37... e4f3  38. g4e6  38... g8h7  39. g2h3  39... g6h6  40. f1f2 After the queen exchange, White wins very easily, since Black's queenside will fall.