DcGentle: <The sacrifice <16. Bxd6!!>> click for larger viewWhite to move played <16. Bxd6!!>. White's 16th move actually is not easily detected by any current engine. I would be surprised, if any of them found this sac because of the ensuing <19. Rf6!>, a positional move, which is starting checkmating actually. Recently I looked at the following analysis again, which I did some years ago, showing that the sac really deserves 2 exclamation marks, because very beautiful mate lines can be found, all of which are much shorter than any engine suggestion. So objectively seen, <16. Bxd6!!> is the best move. Checkmate should follow around move 50. I can claim this, because the following lines are only the tip of the iceberg of my analysis, which lasted several weeks and comprises more than 500 lines. But I was curious to find the truth about the quality of this sac. Enjoy, <DC>
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[Event "Chinese Championship"]
[Site "Xinghua Jiangsu CHN"]
[Date "2011.04.08"]
[Round "9"]
[White "Zhao Jun"]
[Black "Xiu Deshun"]
[Result "1-0"]
[ECO "E26"]
[WhiteElo "2580"]
[BlackElo "2508"]
[PlyCount "63"]
[EventDate "2011.03.30"]
[Annotator "DcGentle"]
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 b6 7. Bd3 Nc6 8. Ne2 Ba6 9. e4 O-O 10. Bg5 h6 11. Bh4 g5 12. Bg3 d6 13. f4 Na5 14. fxg5 hxg5 15. O-O Nh5 16. Bxd6 (16. Nf4 {is the engine proposal. Here there is a feasible line:} Nxf4 17. Bxf4 f6 18. Qh5 Qd7 19. Bxd6 Rf7 20. e5 f5 21. d5 Bxc4 22. dxe6 Bxe6 23. Bb5 Qc8 24. Qxg5+ Rg7 25. Qf6 a6 26. Be2 Qe8 27. Rab1 b5 28. Rbd1 Rf7 29. Qh6 Rh7 30. Qf4 Nb7 31. Rf3 Kh8 32. Rg3 Qf7 33. Bf3 Re8 34. Bxb7 Qxb7 35. Bxc5 Qc7 36. Be3 Qf7 37. Rd6 Qh5 38. Rh3 Qg6 39. Rxh7+ Kxh7 40. Rxa6 Kg8 41. h4 {White is winning, but checkmate is far away.}) 16... Qxd6 17. e5 Qe7 18. Ng3 Nxg3 19. Rf6 Kg7
(19... Rfc8 20. hxg3 Qf8 21. Qh5 Qg7 22. Raf1 Rc7 23. Rh6 Bxc4 24. Rh7 Bxd3 25. Rxg7+ Kxg7 26. Qxg5+ Kf8 27. Rf4 Rac8 28. d5 Re7 29. d6 Rb7 30. d7 Rxd7 31. Rh4 Bh7 32. Rxh7 Rd1+ 33. Kh2 Ke8 34. Qg8+ Kd7 35. Rxf7+ Kc6 36. Qxc8+ Kb5 37. Qe8+ Nc6 38. Qxe6 Rd2 39. c4+ Ka4 40. Rf3 Nb8 41. Qe8+ Rd7 42. e6 a6 43. exd7 Ka5 44. a4 Nc6 45. Qe1+ Nb4 46. Ra3 b5 47. d8=B#) 20. Qg4 Rg8 21. hxg3 Nb7
(21... Kf8 22. Raf1 Rg7 23. Qh5 Bxc4 24. Bxc4 Nxc4 25. d5 Nxe5 26. Rxe6 Qd8 27. Rxe5 Kg8 28. Rff5 f6 29. Re6 Rf7 30. Rxg5+ fxg5 31. Rg6+ Rg7 32. Rh6 Rh7 33. Rxh7 Qf6 34. Rh6 Qxh6 35. Qxh6 g4 36. Kf2 b5 37. Ke3 Rf8 38. Qg6+ Kh8 39. d6 b4 40. axb4 cxb4 41. cxb4 a5 42. bxa5 Rf7 43. d7 Re7+ 44. Kf4 Rxd7 45. Qe8+ Kg7 46. Qxd7+ Kf6 47. a6 Kg6 48. Qe7 Kh6 49. Kf5 Kh5 50. Qh4#) 22. Raf1 Nd8 23. Qe4 Qb7
(23... Bb7 24. d5 Kf8 25. Qh7 Rg7 26. Qh8+ Rg8 27. Qh6+ Ke8 28. d6 Qd7 29. Bg6 Qc6 30. Rxe6+ Nxe6 31. Bxf7+ Kd8 32. Qf6+ Kc8 33. Bxe6+ Kb8 34. Bd5 Qd7 35. Bxg8 a5 36. Be6 Qc6 37. Bd5 Qd7 38. Qf7 Qxf7 39. Rxf7 Bxd5 40. cxd5 a4 41. e6 Kc8 42. Rf8+ Kb7 43. Rxa8 Kxa8 44. e7 Ka7 45. e8=Q Ka6 46. Qc6 Ka7 47. d7 g4 48. d8=Q Ka6 49. Qdxb6#) 24. d5 Rh8 25. Qg6+ fxg6 26. Rxg6+ Kh7 27. Rxg5+ Kh6 28. Rg6+ Kh7 29. Rg4+ Kh6 30. Rf6+ Kh5 31. Rh4+ {Black
resigned.} Kg5 32. Rg6# 1-0
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