[Event "USA-ch"]
[Site "Estes Park"]
[Date "1985.??.??"]
[Round "12"]
[White "Kogan, Boris Markovich"]
[Black "Christiansen, Larry Mark"]
[Result "1/2-1/2"]
[WhiteElo "2500"]
[BlackElo "2560"]

1. d4 e6 2. g3 c5 3. Nf3 b6 4. d5 exd5 5. Qxd5 Nc6 6. Ne5 Qf6 7. Nxc6 dxc6 8. Qe4+ Ne7 9. Bg2 g6 10. O-O Bg7 11. c3 O-O 12. Nd2 Bf5 13. Qa4 Qe6 14. Nf3 h6 15. Re1 a5 16. e4 Bg4 17. Bf4 g5 18. Be3 Ng6 19. Qb3 a4 20. Qc2 a3 21. Nd2 axb2 22. Qxb2 Ne5 23. Qc2 Ra3 24. Rec1 Rfa8 25. Nb3 R3a4 26. Rcb1 Rc4 27. Kh1 Nf3 28. h3 Bh5 29. Qe2 Rxc3 30. Bxf3 Bxf3+ 31. Qxf3 Rxb3 32. Rxb3 Bxa1 33. Rxb6 Qxh3+ 34. Kg1 Rxa2 35. Bxc5 Be5 36. Rb1 Qd7 37. Kg2 Rd2 38. Rc1 Rd3 39. Qf5 Qxf5 40. exf5 Rc3 41. Rxc3 Bxc3 42. g4 Bg7 43. Kf3 Bf8 44. Bd4 Kh7 45. Be5 Bc5 46. Kg3 Be7 47. f4 c5 48. fxg5 Bxg5 49. Kf3 Bd2 50. Ke2 Bb4 51. Kd3 h5 52. gxh5 Kh6 53. Kc4 Kxh5 54. Kd5 Kg4 55. f6 Kg5 56. Bb2 Kf5 57. Ba1 Bd2 58. Kxc5 Bg5 59. Bc3 Bxf6 60. Be1 Ke4 61. Kd6 Bg5 62. Bf2 f5 63. Ke6 f4 64. Be1 f3 65. Bf2 Be3 66. Be1 Bg1 67. Bg3 Bh2 68. Bf2 Kf4 69. Bc5 Kg3 70. Kf5 Kh3 71. Bd4 Bg3 72. Be3 Bd6 73. Bd4 Kg3 74. Bb6 Bb4 75. Bd4 Be1 76. Bc5 Bf2 77. Bd6+ Kh3 78. Kf4 Kg2 79. Kg4 Be3 80. Bg3 1/2-1/2