[Event "US Open"] [Site "Orlando"] [Date "2019.08.09"] [Round "7.16"] [White "O'Brien, Matt"] [Black "Biernacki, Mark"] [Result "1-0"] [WhiteElo "2316"] [BlackElo "2156"] [Variant "Standard"] [TimeControl "-"] [ECO "B06"] [Opening "Modern Defense: Standard Defense"] [Termination "Normal"] [Annotator "lichess.org"] 1. e4 g6 2. d4 Bg7 3. Nc3 d6 { B06 Modern Defense: Standard Defense } 4. Be3 a6 5. Qf3 Nf6 6. e5 Ng4 7. O-O-O O-O 8. Bf4 c5 9. h3 cxd4 10. hxg4 dxc3 11. Bc4? { (-0.78 → -2.02) Mistake. Qxc3 was best. } (11. Qxc3 Bxg4) 11... Qa5? { (-2.02 → -0.37) Mistake. Nc6 was best. } (11... Nc6 12. exd6) 12. Ne2 dxe5? { (-0.69 → 0.83) Mistake. cxb2+ was best. } (12... cxb2+) 13. Rxh7?? { (0.83 → -2.90) Blunder. Bh6 was best. } (13. Bh6 Bxh6+ 14. Rxh6 cxb2+ 15. Kb1 Qc7 16. Qe4 Qc6 17. Bd5 Rd8 18. Qxe5 Rxd5 19. Qxd5 Qxd5) 13... exf4?? { (-2.90 → 0.38) Blunder. Be6 was best. } (13... Be6 14. Rxg7+) 14. Rdh1 e6?? { (0.50 → 12.00) Blunder. Qb6 was best. } (14... Qb6 15. Rxg7+ Kxg7 16. Qxc3+ Qf6 17. Qh3 Rd8 18. Qh6+ Kg8 19. Qh7+ Kf8 20. Qh8+ Qxh8 21. Rxh8+) 15. Qh3 f5?! { (11.39 → Mate in 10) Checkmate is now unavoidable. Qh5 was best. } (15... Qh5 16. gxh5) 16. Rxg7+ Kxg7 17. Qh7+ Kf6 18. g5+ Ke5 19. Rd1 cxb2+ 20. Kb1 Rd8 21. Qg7+ Ke4 22. Rd4+ Rxd4 23. Qxd4# { White wins by checkmate. } 1-0