1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... f8b4  5. c4d5  5... e6d5  6. c1g5  6... h7h6  7. g5h4  7... e8g8  8. e2e3  8... c8f5  9. d1b3  9... b4c3  10. b3c3 This is the modern move against the Ragozin. 10... g7g5 But as a leading specialist of the line, Aronian is, of  course, aware of it. With his last move, he is entering less charted  territory. 11. h4g3  11... f6e4  12. c3a3  12... b8d7 And uncorks a novelty. The  knight is heading to overprotect the vital e4-spot. 13. f1d3  13... f8e8  14. f3d2  14... d7f6  15. d2e4  15... f5e4  16. e1g1  16... e4d3  17. a3d3  17... f6e4 This does not seem to give enough.  18. g3e5 Shankland correctly saves the bishop. He will need it for the  coming kingside assault. 18... c7c6  19. f2f3  19... e4c5 Apparently, Aronian counted on this trick to hold the center. 20. d3f5 The key move. It is all about centralization. 20... d8e7  21. f3f4 Everything is coming in time. It seems as Aronian's position will collapse at any moment. 21... c5e4  22. f4g5  22... h6g5  23. f1f3  But this is inaccurate. 23... f7f6  24. e5f6  24... e7f6  25. f5f6  25... e4f6 