1. g1f3  1... d7d5  2. g2g3  2... g7g6  3. c2c4  3... c7c6  4. d1a4  4... d5d4  5. b2b4  5... f8g7  6. d2d3  6... e7e5  7. f1g2  7... g8e7  8. e1g1  8... e8g8  9. b1d2 A form of reversed Pirc  appeared on board, and it will soon transpose into a reversed Benoni. 9... c8e6  10. c1b2  10... h7h6  11. b4b5  11... c6c5  12. a4c2  12... b8d7  13. e2e3 Now it is a reversed Benoni, and Aronian  hurries to play on his side with 13... f7f5  14. e3d4  14... e5d4  15. f1e1 That is the difference: Mamedyarov can use the  open e-file at once. 15... e6f7  16. h2h4  16... e7c8 This maneuver is very logical, but Aronian might have missed  an important detail. 17. d2b3  17... c8d6  18. b2c1 That is what Black missed. Mamedyarov transfers his bishop on  a better diagonal with tempo. 18... f7e8 