1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... f8b4  5. e2e3  5... e8g8  6. c1d2 Quite a solid  line. 6... b7b6  7. c4d5  7... e6d5  8. f1d3  8... c8b7  9. e1g1  9... b4e7  10. f3e5  10... c7c5  11. c3e2  11... b8c6  12. e5c6 A novelty. 12... b7c6  13. d4c5  13... b6c5 The arising hanging pawn structure looks quite alright for Black. The pawns are not under siege yet, and Aronian has  clear prospects of a play along the b-file. 14. d2c3  14... d8b6  15. e2g3 Erigaisi weakens the opponent's kingside. Why? We  shall see in a moment. 15... g7g6  16. b2b4 This is one of the ways to fight the hanging pawns.  Separate them and use the squares that are opened for your own pieces.  True, Erigaisi needs to sacrifice a pawn for these goods. 16... c5b4  17. c3d4  17... b6d8 Aronian is careful. 18. a1c1  18... c6b7  19. d1f3 This attacking setup is what Erigaisi was heading  for. The inclusion of the white knight is always in the air. 19... d8d6  20. h2h4 With the clear intention to soften the king's position. 20... f8c8 Aronian is challenging the opponent on the opposite wing in  the meantime. 21. h4h5  21... a7a5  22. d3f5  22... c8c1 Very accurate again. 23. f1c1  23... f6e8 This maneuver, though, does not reinforce Black's defense.  Actually it adds tactical chances for White as we are about to witness. 24. f3g4  24... e8g7  25. f5g6 The right idea but the wrong execution. 25... f7g6  26. d4g7  26... a8c8 That is the difference. Aronian can ignore  the enemy bishop and can still rely on his kingside pawn protection. 27. c1d1  27... c8c2  28. g7a1  28... c2c4  29. g4e2  29... d6c6  30. a1d4  30... e7f6 Aronian is playing with fire. 31. h5g6  31... h7g6  32. g1h2 The king is stepping away from the possible  checks; thus White avoids the trade of rooks. Erigaisi still needs to look for a way to checkmate the opponent, while Aronian would love to see the  major pieces traded that would eventually win the endgame for him. 32... f6d4  33. e3d4  33... c4c2  34. e2f3  34... c6e6  35. f3f4  35... g8g7  36. d1d3 The rook is almost in, and this is very dangerous for Black. 36... e6f6 Not really a mistake but Aronian makes a step in the wrong  direction. 37. f4g4  37... f6f2 And this loses!