[Event "Interzonal-04"]
[Site "Portoroz"]
[Date "1958.09.06"]
[Round "19"]
[White "Petrosian, Tigran V"]
[Black "Olafsson, Fridrik"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nh5 8. g3 Nd7 9. Be3 Nhf6 10. Nd2 c6 11. h4 Ne8 12. g4 f5 13. gxf5 gxf5 14. exf5 Ndf6 15. h5 h6 16. Qc2 cxd5 17. cxd5 b5 18. Bxb5 Ng4 19. Nde4 Bxf5 20. Bd3 Kh8 21. Qe2 Qa5 22. Bd2 Ngf6 23. Nxf6 Rxf6 24. Rg1 Qb6 25. Bxf5 Rxf5 26. Be3 Qb4 27. a3 Qb3 28. Rg6 e4 29. Kf1 Nf6 30. Bxh6 Bxh6 31. Rxh6+ Kg7 32. Rg6+ Kf7 33. Nxe4 Qh3+ 34. Kg1 Nxe4 35. Qxe4 Rxh5 36. Rg3 Qh2+ 37. Kf1 Qh1+ 38. Qxh1 Rxh1+ 39. Rg1 Rh3 40. Rd1 Rb8 41. Rd2 Rhb3 42. Rd4 Kf6 43. Re4 Rd3 44. Re6+ Kf5 45. Rg7 Rxd5 46. Re2 a5 47. Rf7+ Kg5 48. Rf3 Rdb5 49. Rd2 R8b6 50. Rfd3 Kf4 51. Rxd6 Rxd6 52. Rxd6 Rxb2 53. Kg2 Rb3 54. Rd4+ Ke5 55. Ra4 Rb5 56. Kg3 Kf5 57. f3 Rc5 58. Rd4 Rb5 59. Rh4 Kg6 60. Rc4 Kf5 61. Rc6 Rd5 62. Kf2 Rb5 63. Kg3 Rd5 64. a4 Kg5 65. Rc4 Kf5 66. Kf2 Rd3 67. Rh4 Kg6 68. Rg4+ Kf5 69. Kg3 Ra3 70. Rc4 Kg6 71. Kg4 Kf6 72. f4 Ra1 73. Kf3 Ke6 74. Ke4 Re1+ 75. Kd3 Rd1+ 76. Kc2 Rf1 77. Rd4 Rf3 1/2-1/2