[Event "Interzonal-11b"]
[Site "Rio de Janeiro"]
[Date "1979.10.10"]
[Round "13"]
[White "Ivkov, Borislav"]
[Black "Vaganian, Rafael A"]
[Result "1/2-1/2"]
[WhiteElo "2525"]
[BlackElo "2570"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nbd7 7. O-O e5 8. e4 c6 9. h3 Qb6 10. b3 exd4 11. Na4 Qd8 12. Nxd4 Re8 13. Re1 Nc5 14. Nc3 a5 15. Rb1 Nfd7 16. Be3 h5 17. Qc2 Qe7 18. Rbd1 Nf8 19. Re2 Nfe6 20. Nxe6 Nxe6 21. Qd2 h4 22. g4 g5 23. Ree1 Be5 24. Ne2 Qf6 25. Rf1 Nf4 26. Nxf4 gxf4 27. Bd4 Be6 28. Bf3 a4 29. Bxe5 dxe5 30. Qb4 Qe7 31. Qc3 axb3 32. axb3 f6 33. Kh2 Ra2 34. g5 Kg7 35. gxf6+ Kxf6 36. Rd2 Rxd2 37. Qxd2 Rd8 38. Qc2 Rg8 39. Rd1 Qc5 40. Qe2 Ke7 41. Qd2 Kf6 42. Bg4 Bxg4 43. hxg4 Qd4 44. Qc2 Qb6 45. c5 Qb4 46. Kh3 Kg5 47. Qd3 Qd4 48. Qxd4 exd4 49. Rxd4 Ra8 50. e5 Ra2 51. Re4 f3 52. Re3 Rxf2 53. e6 Re2 54. Rxf3 Rxe6 55. Rf5+ Kg6 56. Kxh4 Re3 57. Rg5+ Kh6 58. Rg8 Rxb3 59. g5+ Kh7 60. Rd8 Kg6 61. Rd6+ Kg7 62. Kh5 Rh3+ 63. Kg4 Rb3 64. Kh5 Rh3+ 65. Kg4 1/2-1/2