[Event "Olympiad-19 Preliminaries B"]
[Site "Siegen"]
[Date "1970.09.05"]
[Round "1"]
[White "Ivkov, Borislav"]
[Black "Ujtumen, Tudev"]
[Result "1-0"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 c6 6. e4 d6 7. Nf3 Na6 8. O-O Nc7 9. h3 Rb8 10. Be3 Bd7 11. Qd2 a6 12. Bh6 Nfe8 13. Bxg7 Nxg7 14. Rfe1 b5 15. b3 f6 16. Rad1 Qc8 17. Kh2 Rf7 18. e5 Qf8 19. exd6 exd6 20. Ne4 Nge6 21. d5 cxd5 22. cxd5 Ng7 23. Nd4 Nxd5 24. Ng5 fxg5 25. Bxd5 h6 26. f4 g4 27. hxg4 Bxg4 28. Rc1 Kh7 29. Bxf7 Qxf7 30. Nc6 Re8 31. Qxd6 Rxe1 32. Rxe1 Qf5 33. Ne5 Qc2+ 34. Kg1 Bf5 35. Qd4 Qxa2 36. g4 Be6 37. Nxg6 Bxg4 38. Ne7 Qxb3 39. Qe4+ Kh8 40. Qa8+ Kh7 41. Qe4+ Kh8 42. Rc1 Qg3+ 43. Kf1 Bh3+ 44. Ke2 Bg4+ 45. Kd2 Qf2+ 46. Kd3 Qg3+ 47. Qe3 Qh2 48. Rc6 Qh1 49. Rc1 Qb7 50. Rc6 Qd7+ 51. Kc3 Be6 52. f5 Qxe7 53. fxe6 Qa3+ 54. Kd2 Qb4+ 55. Kc1 1-0