Amazing rook! It has cleared the road for the remaining major pieces.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... c7c5  4. d4d5  4... b7b5 The Blumenfeld gambit is not the  most common opening at a top level, but something creative should  definitely be expected by these two players! 5. d5e6  5... f7e6  6. c4b5  6... d7d5  7. g2g3  7... a7a6 A fresh approach. 8. b5a6  8... b8c6  9. f1g2  9... f8e7  10. e1g1  10... e8g8  11. b1c3  11... c8a6 The opening is more or less over, and Mamedyarov got the usual compensation for the line. Unlike the Benko  gambit where Black mainly operates on the half-open a- and b-files, Black  searches for a quick kingside attack in the Blumenfeld. He often succeeds  in doing so, thanks to his solid center. 12. b2b3  12... h7h6  13. c1b2 The obvious development is a novelty. 13... d8e8 Natural and good. That is the main idea of the line. The  queen is transferred to the h5-square, next Nf6-g4 will follow and the  half-open f-file would provide Black decisive attacking supplies. 14. a1c1  14... e8h5  15. f1e1  15... a8d8  16. c3a4  16... f6e4 For the time being Mamedyarov mounts more pressure while  keeping his pawn. 17. b2a3  17... c6e5 The time had come to sacrifice the c5-pawn. Since the  first knight no longer has access to the g4-square, the Azerbaijani GM  brings the second one there. 18. a3c5  18... e5g4 Beautiful final preparation. Now everything is ready for  the decisive attack. Black only needs to get rid of the key defender on  f3. 19. c5e7 Duda thinks that this bishop will save the day, but that is an illusion. 19... f8f3 This is what it was all about. 20. e7h4  20... f3f2  21. g2e4  21... f2h2  22. e4f3 