[Event "Interzonal-08"]
[Site "Palma de Mallorca"]
[Date "1970.11.29"]
[Round "15"]
[White "Addison, William G"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 e6 3. c3 d5 4. exd5 exd5 5. Bb5+ Nc6 6. Qe2+ Be7 7. O-O Nf6 8. Re1 Bg4 9. Bxc6+ bxc6 10. d3 Bxf3 11. Qxf3 O-O 12. c4 Re8 13. Nc3 d4 14. Ne4 Nxe4 15. Rxe4 Bd6 16. Bd2 Qc7 17. g3 Rxe4 18. Qxe4 Qb7 19. b3 Bf8 20. Ba5 Qa6 21. Qe1 Bd6 22. Qd2 Re8 23. Re1 Rxe1+ 24. Qxe1 Kf8 25. a3 h6 26. b4 cxb4 27. axb4 Qb7 28. c5 Bc7 29. Bxc7 Qxc7 30. Qe4 Qd7 31. Qe5 f6 32. Qb8+ Kf7 33. Qa8 Ke6 34. h4 f5 35. Qb8 Kf6 36. Qf8+ Ke6 37. h5 Ke5 38. f4+ Ke6 39. Kf2 a6 40. Qa8 Kf6 41. Qf8+ Ke6 42. Kg1 Qe7 43. Qc8+ Qd7 44. Qxa6 Ke7 45. Qa2 Kf8 46. Qa8+ Kf7 47. Qb8 Qd5 48. Qe5 Qf3 49. Qxf5+ Kg8 50. Qe6+ Kf8 51. Qd6+ Kg8 52. Qxd4 Qxg3+ 53. Kf1 Qf3+ 54. Ke1 Qxh5 55. Qe4 Qh4+ 56. Kd1 Qg4+ 57. Kc2 Qd7 58. f5 Kf7 59. d4 h5 60. b5 cxb5 61. c6 Qd6 62. d5 Qc5+ 63. Kb3 h4 64. Qe5 Qc4+ 65. Kb2 Qb4+ 66. Kc2 Qc5+ 67. Kd3 Qc4+ 68. Kd2 Qb4+ 69. Ke2 Qc4+ 70. Kf3 Qf1+ 71. Kg4 Qg2+ 72. Kxh4 Qh1+ 73. Kg3 1/2-1/2