[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.08"]
[Round "12"]
[White "Tan, Lian Ann"]
[Black "Portisch, Lajos"]
[Result "0-1"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Qd7 6. Bxc6 bxc6 7. O-O e5 8. Qd3 Be7 9. c4 Ba6 10. Rd1 Nf6 11. Bg5 Rd8 12. Nbd2 O-O 13. b4 h6 14. Bxf6 Bxf6 15. a4 Bb7 16. b5 Qc7 17. Nf1 d5 18. Ne3 dxe4 19. Qxe4 cxb5 20. Nd5 Bxd5 21. cxd5 Qc4 22. Qxc4 bxc4 23. Rac1 e4 24. Nd2 Rxd5 25. Nxe4 Rxd1+ 26. Rxd1 Bb2 27. Rd2 c3 28. Rc2 Rc8 29. Kf1 Rc4 30. f3 f5 31. Nf2 Rxa4 32. Nd1 Ba1 33. Rc1 Ra3 34. Rc2 Kf7 35. Ke2 Ke6 36. Kd3 g6 37. Kc4 Ra4+ 38. Kb3 Rd4 39. Re2+ Kd6 40. Ne3 Rd3 41. Nc4+ Kc5 42. Ra2 Rd1 43. Rxa7 Rb1+ 44. Kc2 Rg1 45. Kb3 f4 46. Ra2 Kd4 47. Ra7 Rb1+ 48. Kc2 Rb4 49. Na5 Rb2+ 50. Kc1 Rxg2 51. Nb3+ Kd3 52. Rd7+ Ke2 53. Nd4+ Kf2 54. h4 Bb2+ 55. Kb1 Rg1+ 0-1