Geodesy

Seyyed Mohammad Amin Tabatabaei – 侯逸凡 (Hóu Yìfán)
15th International Chess Open; Nakhchivan, May 9, 2015
Nimzo-Indian Defence E50

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 0-0 5. Bd3 c5 6. Nf3 Nc6 7. 0-0 Bxc3 8. bxc3 d6 9. e4 e5 10. d5 Ne7 11. Ne1 Ne8 12. g4 (12. Qc2 h6 13. a4 g5 14. g3 Bh3 15. Ng2 Ng7 16. Qe2 Qd7 17. f4 f6 18. f5 a5 19. Rf2 Bxg2 20. Kxg2 Nc8 21. h4 Qe8 22. Be3 b6 23. Bc2 gxh4 24. Rh1 h5 25. gxh4 Rf7 26. Rg1 Kf8 27. Kf1 Ke7 28. Rfg2 Qh8 29. Rg6 Ra7 30. Bd1 Kd8 31. Qg2 Ne8 32. Qf3 Rg7 33. R1g2 Raf7 34. Bh6 Rh7 35. Bc1 Ne7 36. Qe2 Rfg7 37. Rxg7 Rxg7 38. Rxg7 Nxg7 39. Qd2 Ng8 40. Qb2 Kc7 41. Qb5 Ne7 42. Qa6 Nc8 43. Qa8 Ne8 44. Qc6+ Kd8 45. Qb5 Ke7 46. Be3 Qh7 47. Bf3 Qh8 48. Kg2 Nc7 49. Qb1 Ne8 50. Kf2 Qh7 51. Ke2 Ng7 52. Kd3 Ne8 53. Qg1 Kf7 54. Qc1 Ke7 55. Bh6 Ng7 56. Qe3 Kf7 57. Bxg7 Kxg7 ½ : ½ Kortschnoi – Kolarov, 38th CSR Chess Championship & “Réti Memorial” International Tournament, Luhačovice 1969) 12. ... Ng6 13. Ng2 Nh4 14. Ne3 h5 15. f3 Nf6 16. Nf5 Nh7 17. Be3 Ng5 18. Kh1 Nh3 19. gxh5 Nxf5 20. exf5 Qh4 21. h6 gxh6 22. Qd2 Kh8 23. Bxh6 Rg8 24. Be3 Bd7 25. f4 e4 26. Bxe4 Rae8 27. Bc2 Qg4 28. Bd1 Qxf5 29. Bf3 Qh7 30. Rae1 Rg7? (30. ... Bf5!∓)

31. f5! Qxf5 (31. ... Bxf5?? 32. Bd4! Rxe1 33. Bxg7+ Qxg7 34. Rxe1+−) 32. Bg2 Qh7 33. Bh6∞ Rgg8 34. Re3 Rxe3 35. Bxe3 Bf5

36. Bf3? (⌓ 36. Qe1!) 36. ... Bd3 37. Re1 Qf5. 37. ... Be4! would win immediately for Black. 38. Bd4+! Kh7? (38. ... cxd4! 39. Qh6+ Qh7 40. Qf6+ Qg7 41. Qh4+ Bh7 42. Qxh3 d3−+) 39. Qxd3 Qxd3 40. Be4+ Kh6? 40. ... Qxe4 41. Rxe4 cxd4 42. Rh4+ Kg7 43. Rxh3 Rc8 44. cxd4 Rxc4 is still much better for Black. 41. Bxd3 cxd4 42. Rf1 dxc3 43. Bf5 Ng5 44. h4 Nh7 45. Bxh7 (45. Rc1 Rg3) 45. ... Kxh7 46. Rxf7+ Kg6 47. Rf3 c2 48. Rc3 Rh8 49. Kg2 Rxh4 50. Rxc2 b6 51. a4 Kf5 52. a5 bxa5 53. c5 Ke5 54. Kg3 Rb4 55. c6 Rb8 56. Ra2 Kxd5

57. Rxa5+? White misses his only chance with 57. c7! Rg8+ 58. Kf4 Kc6 59. Rxa5 Kb6 60. Ra2 a5 61. Ke4 and now 61. ... Rc8 62. Kd5 Kxc7 63. Rb2+! Ka6 64. Kxd6 with a draw. 57. ... Kxc6 58. Rxa7 Rf8! Cutting off the King. 59. Ra1 d5 60. Rc1+ Kb5 61. Rb1+ Kc4 62. Rc1+ Kb3 63. Rd1 Rd8 64. Kf2 Kc2 65. Rd4 Kc3 66. Ra4 Re8! 67. Ra3+ Kb4 0 : 1.