Tertium non datur

居文君 (Jū Wénjūn) – Žan Tomazini
17th Gibraltar Chess Festival; Catalan Bay, January 29, 2019
Benkö Counter-Gambit A58

1. d4 Nf6 2. c4 g6 3. g3 c5 4. d5 b5 5. cxb5 a6 6. bxa6 Nxa6 7. Nc3 Bg7 8. Nf3 d6 9. Bg2 0-0 10. 0-0 Bf5 11. Nd2 Nb4 12. Nc4 Bc2. After 12. ... Nc2!? 13. g4! Nxg4 14. e4 Nxa1 15. exf5 Bxc3!? 16. bxc3 Nf6 17. Qe2! Re8 18. Bg5! Black is on the verge of ruin, Grischuk – Carlsen, 6th Sinquefield Cup, Saint Louis 2018. 13. Qd2 Bb3 14. Na3 Bxd5 15. Nxd5 Nfxd5 16. Nc4 Nf6!? And here is the third version of an Exchange sacrifice which in practice proved to be quite justified. Firstly — 16. ... Nb6 17. Nxb6 Qxb6 18. Bxa8 Rxa8 19. Qe3 Qb7 20. Qb3 Qe4 21. Be3 Qc2 22. Bg5 Qxb2 23. Qf3 Qa3 24. Qxa3 Rxa3 25. Bxe7 Bxa1 26. Rxa1 Rxa2 27. Rxa2 Nxa2 28. Kf1 c4 29. Ke1 Nc3 30. Bxd6 Nb5 31. Be5 f5 32. e4 fxe4 ½ : ½ Pr. Nikolić – Ramírez Álvarez, 67th Corus Chess Tournament (B-Group), Wijk aan Zee 2005. Secondly — 16. ... Nc7 (probably the best way) 17. Bxa8 Qxa8 18. Ne3 Ne6 19. a3 Rb8 20. Rb1 Qe4 21. axb4 Qxb1 22. Nd5 Bf8 ½ : ½ Draško – Bejtović, 10th Premier League of Bosnia and Herzegovina Team Chess Championship, Neum 2011. 17. Bxa8 Qxa8 18. a3 d5?? After this terrific mistake, 居文君 (Jū Wénjūn) can literally put the autopilot on and easily take over the Queenside. 18. ... Nc6! was certainly best and still quite unclear. 19. Nb6+− Qa7

20. axb4! Qxa1 (20. ... Qxb6 21. bxc5 Qxc5 22. Qd3+−) 21. bxc5 e6 22. b4 Ne4 23. Qd3 Qc3 24. Qxc3 Nxc3 25. Re1 Nb5 26. Bd2 Rb8 27. e4! dxe4 28. Rxe4 Rd8 29. Be3 Rd3 30. c6 Rc3 31. Rc4 Be5 32. Rxc3 Bxc3 33. Bc5 Be5 34. Nd7 Bc7 35. Nf6+ Kh8 36. f4 e5 37. Nd5 Bb8 38. Bb6 Ba7 39. Bxa7 Nxa7 40. c7 1 : 0.