雷挺婕 (Léi Tǐngjié) – Leon Luke Mendonca
1st Julius Bär Challengers Chess Tour; 1st stage; Polgár Challenge; time control: 10 minutes plus 5 seconds per move; chess24.com, April 10, 2021
Sicilian Defence B90
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. a4 g6 7. Be2 Bg7 8. 0-0 0-0 9. Be3 Nc6 10. Qd2 Bd7 11. Rfd1 Rc8 12. f3 Nxd4 13. Bxd4 Be6 14. a5 Bc4 15. Ra4 Bxe2 16. Qxe2 Qd7!? (16. ... Nd7 19. Bxg7 Kxg7 20. Nd5 Rc6 21. Qd2 Nf6 22. Nxf6 exf6 23. Rd4 Qc7 24. Rc1 b6 25. axb6 ½ : ½ Ivanchuk – Gelfand, 9th Amber Amber Blindfold Chess Tournament, Monte Carlo 2000) 17. Rb4 Qc7 18. Bb6 Qc6 19. Rd2 Rfe8 20. Nd5 Nd7 21. Be3 e6 22. Nb6 Nxb6 23. Rxb6 Qa4 24. c3 d5 25. Rxb7 Qxa5 26. Bd4 Bxd4+ 27. Rxd4 Qc5 28. Qf2 dxe4 29. fxe4 Rc7 30. Rxc7. 30. Rd7 would lead to a draw almost immediately, but White apparently hopes for more. 30. ... Qxc7 31. Qf6 Rb8 32. Rd2 Qb6+ 33. Qf2 Qc6 34. Qf4 Qb6+ 35. Qf2 Qc6 36. Qf4 Qc5+ 37. Qf2 Qe5. Now it is Black who disagrees to a draw (37. ... Qc6). 38. Qd4. Maybe not so bad — but first 38. Rd7 Rf8 and then 39. Qd4 was the best course toward equality. 38. ... Qxd4+ 39. cxd4 Kf8 40. Kf2 Ke7 41. Rc2 Kd6 42. Ke3 Rb3+ 43. Kf4 f5
44. exf5. 44. e5+! Kd5 45. Kg5! Kxd4 46. Kf6 should draw. 44. ... gxf5 45. Rc8? A nervous mistake that — followed by (at least) another one — will finally cost White half a point. Despite everything, she could still hold the endgame after 45. g4! — and maybe also with other moves. 45. ... Rxb2 46. Rd8+ Ke7 47. Rh8 Rxg2 48. Rxh7+ Kd6 49. h4 Rg4+ 50. Ke3 Rg3+ 51. Ke2? As Grandmaster Karsten Müller recommends in his notes for the ChessBase web site, 51. Kf4! was now White’s last chance, since after 51. ... Rd3 52. h5 Rxd4+ 53. Kg5 Black cannot win in spite of being two Pawns ahead. 51. ... Kd5 52. Rd7+ Kc6 53. Ra7 Rh3 54. Re7 Kd5 55. Rd7+ Kc6 56. Ra7 Rxh4 57. Rxa6+ Kd5 58. Ra5+ Kc4 59. Ra6 Re4+ 60. Kf3 Kxd4 61. Ra4+ Ke5 62. Ra5+ Kf6 0 : 1.
51. Ke2? GM Karsten Müller, in his notes for the ChessBase website, observes that "This retreat is too passive. White is now basically playing without the king. 51.Kf4 was called for, e.g. 51...Rg4+ 52.Ke3 a5 53.Ra7 Rxh4 54.Rxa5 Rh3+ But no rule without excepetion as now passivity is called for: 55.Ke2= (55.Kf4? Rd3-+)." See https://de.chessbase.com/post/polgar-challenge-tag-3-praggnanandhaa-fuehrt-keymer-ist-fuenfter
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