Jonathan Koh - Mas , Commonwealth Open

IM Mas Hafizulhelmi (2419) vs Jonathan Koh (2211)

Commonwealth Open, Singapore, 10.12.09, Round 1

Analysed by Hairulov and Fritz

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 b5 8. Bg5 Be7 9. Qf3 Qb6 10. O-O-O O-O 11. Rhe1 Nbd7 12. Qg3 Nc5 13. f4 Bb7 14. Bh6 Ne8 15. f5 Bf6 Theory also recommend 15... e5 16. Be3 Alternative is 16. fxe6 Bxd4 17. exf7+ ?! Kh8 18. fxe8=Q Raxe8 19. Be3 ( Not 19. Rxd4? Nxb3+ 20. axb3 Qxd4 and white is down in material ) 19... Be5 16... Nxb3+ Interesting is 16... b4!? 17. Na4 Nxa4 18. Bxa4 Qa5 17. axb3 Qa5 18. Kb1 b4 19. Na4 Bxe4 Another option is 19... e5 20. Nf3 Bd8 to prevent 21.Bb6 21. Nd2 Rc 20. fxe6 fxe6 20... Be5 is probably better for e.g 21. exf7+ Rxf7 22. Qh4 Nf6 21. Bf4?! White should have played 21. Qg4! Bf5 22. Nxf5 Qxf5 23. Qxf5 exf5 And black pawns looks weak. 21. Nxe6? Will fell into a tactic after Bxc2+ 22. Kxc2 Qf5+ 21... Bxd4 22. Rxd4 d5 Black's bishop on e4 look strong 23. Bd2 Qc7 24. Qxc7 Nxc7 25. Bxb4 Rf4 25... Rf2!? is another option 26. Rd2 Rxd2 27. Bxd2 Bxg2 28. Nc5 Bh3 29. Ba5 Rc8 30. Bxc7 Rxc7 31. Nxa6 26. Rd2 Rc8?! 26... Nb5 is better, now white have the initiative after 27. Bd6 Rf7 28. Nc5 Bf5 29. Bg3 h5 30. Ree2 30. b4!? 30... Bg4 31. Rf2 Bf5 32. Rfe2 Bg4 33. Rf2 Bf5 34. h4 ?! Nb5 35. Nd3 Nd4 36. Ne5 Nxb3 37. Rde2 Nd4 38. Nxf7 Nxe2 This is the critical point. 39. Nh6+? 39. Nd6! is correct e.g Bxc2+ 40. Ka1 Nxg3 41. Nxc8 Be4 an imbalance position has arise and i'm not sure who has the upper hand 39... gxh6 40. Rxe2 Rc4 41.Be1 Kf7 42. b3 Rc8 43. Kb2 Ke7 44. Bc3 Be4 45. Be5 Rf8 46. Kc3 Kd7 47. Kd4 Rf1 48. Rd2 Kc6 49. b4 Re1 50. Bg7? White should have not bother about the h6 pawn. 50. Bg3 Rb1 51. c3 is better 50... Bf5 Threatening Re4+ 51. g3 If 51. Bxh6 Re4+ 52. Kc3 Rc4+ 53. Kb3 Rxh4 51... Re4+ 52.Kc3 Re3+ 53. Kd4 Rxg3 54.Bf6 White realize that 50...Bg7 was a mistake. 54. Bxh6 Rg4+ 54... Rg4+ 55.Kc3 Kb5 56. Be7 Rg3+ 57. Kd4 57. Kb2 is leser evil. 57... Rg7! Now white's bishop can't protect both b4 and h4 pawn at the same time. 58. Bd6 Rg4+ 59. Kc3 Rxh4 Three pawn up, Black is totally winning. 60. Kb3 Kc6 61. Be7 Rc4 62. c3 h4 63. Ra2 Kb7 64. Bd6 h3 65. Ra5 Re4 66. Bh2 Re2 67. Ra2 Rg2 68. Be5 Bd3 69. Ka3 Bc4 70. Rb2 Kc6 71. Bf4 h5 72. Rxg2 hxg2 73. Bh2 e5 0-1