[Event "American Continental Championship"] [Site "chess24.com"] [Date "2018.06.10"] [Round "11.1"] [White "Shankland, Samuel"] [Black "Sosa, Tomas"] [Result "1-0"] [WhiteElo "2717"] [WhiteTeam "United States"] [BlackElo "2453"] [BlackTeam "Argentina"] [Annotator "Aagaard"] [Variant "Standard"] [ECO "D38"] [Opening "Queen's Gambit Declined: Ragozin Defense"] [Source "https://lichess.org/study/01hV316f/Nfj9zLjQ"] [Orientation "white"] 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Bb4 5. Qb3 a5?! 6. a3 Be7 7. Bf4 O-O 8. e3 b6 { The weakness in this position is the c7-pawn, and Black's idea is now ... Bc8-a6. } 9. Rc1 { This move adds pressure to the weak c7-pawn and prepares to meet ...Bc8-a6 with Nc3-b5. } (9. Nb5 Na6) (9. Bd3 Ba6 10. Nb5 dxc4 11. Bxc4 c6 12. Nc7 Bxc4 13. Qxc4 Ra7) (9. cxd5 Nxd5 10. Nxd5 exd5 11. Be2 (11. Bd3 Be6) (11. Rc1 c5 (11... Na6 12. Bxa6 (12. Ne5) 12... Bxa6 13. Bxc7 Qd7 (13... Qc8 14. Kd2 Bc4 15. Qxb6 Ra6) 14. Ne5 (14. Qxb6) 14... Qf5) 12. dxc5 bxc5 13. Bxb8 c4 14. Qb5 Ba6 15. Qc6 Qxb8 16. Qxd5 (16. Rc2 Bxa3) 16... Qxb2) 11... Be6 12. O-O a4 (12... c5 13. Ne5 f6 14. Nf3 Nc6 (14... c4 15. Qc2 Nc6 16. e4 b5) 15. Bb5) 13. Qc2 c5) 9... Bb7 (9... Ba6 10. Nb5 (10. cxd5 Bxf1 11. Kxf1 exd5 12. Nb5 (12. Ke2 c6 13. Bxb8 Rxb8 14. Ne5) 12... Na6 13. Nxc7 Rc8 14. Qxb6 Nxc7 15. Rxc7 Ne8 16. Rb7 (16. Rc6 Qxb6 17. Rxb6 Rc2) 16... Rc1+ 17. Ne1 Qc8) 10... Bxb5 11. cxb5) 10. cxd5! (10. Ne5 Nh5) (10. Bd3 Na6) 10... Nxd5 (10... exd5 11. Nb5 (11. Bd3) 11... c5 12. Nc7 Ra7 13. Qxb6) 11. Nxd5 (11. Bg3 c5) 11... Bxd5 12. Bc4 Bxf3?! (12... c5 13. O-O (13. Bxd5 exd5 14. dxc5 Bxc5 (14... bxc5) 15. Rd1)) 13. gxf3 Bd6 14. Bg3 (14. Bxd6 cxd6 15. Bb5 Nd7 16. Bc6) 14... Nd7 15. Bb5! { with a clear advantage for White } 15... Nf6 16. Ke2?! Nh5 17. Rc6 Nxg3+? 18. hxg3 e5?! 19. dxe5 Bxe5 20. Bd3! g6? 21. Bxg6! hxg6 22. Rxg6+ Bg7 23. Rh4! a4 24. Qa2 Qd7 25. Rhg4 Qb5+ 26. Ke1 Rad8 27. Rxg7+ Kh8 28. R7g5 Rd1+!? 29. Kxd1 Qf1+ 30. Kd2 Rd8+ 31. Rd5 Qxf2+ 32. Kd3 Qf1+ 33. Ke4 f5+ { 1-0 White wins. } 1-0