Mariya had a rocky start against our fellow Canadian Yuan in round 1, while Humpy won all 3 matches so far with a 2-0 score. It is then unexpected to see Mariya surprising her opponent with a nice pseudo Queen sac and scoring the full point when black's King was left alone.
[Event "WWCC2015"][Site "Sochi"][Date "2015.03.26"][Round "22.1"][White "Muzychuk, Mariya (UKR)"][Black "Koneru, Humpy (IND)"][Result "1-0"][ECO "C45"] 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. g3 d5 8. Bg2 dxe4 9. O-O O-O 10. Nd2 Bb6 11. Re1 Nxd4 12. Nxe4 Qf5 13. Bxd4 Nc6 14. Bxb6 axb6 15. f4 Be6 16. b3 h6 17. h3 Ra3 18. Qd2 Qa5 19. b4 Qa4 20. g4 Rd8 21. Qf2 Rxa2 22. Rxa2 Bxa2 23. b5 Na7 {the black pieces have deserter their King } 24. g5 hxg5 25. Nxg5 f6 {now it is too late to put up a defence} 26. Qd2 Rf8 27. Bd5+ Bxd5 28. Qxd5+ Kh8 29. Qf7