[Event "San Antonio"]
[Site "San Antonio"]
[Date "1972.11.19"]
[Round "1"]
[White "Campos Lopez, Mario"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5 6. Nb3 Bb6 7. Nc3 Nc6 8. Qe2 Nge7 9. Be3 O-O 10. O-O-O a5 11. a4 Bxe3+ 12. Qxe3 d5 13. e5 Nb4 14. Nd4 Nec6 15. f4 Bd7 16. Rhf1 Rc8 17. Rf3 Nxd4 18. Qxd4 f5 19. Kb1 Qe7 20. Rc1 Rc7 21. Bb5 Rfc8 22. Bd3 Qc5 23. Qxc5 Rxc5 24. Rf2 d4 25. Bb5 Bxb5 26. Nxb5 Nd3 27. Rd2 Nxc1 28. Kxc1 d3 29. c3 Rc4 30. Nd6 R8c7 31. Nxc4 Rxc4 32. g3 Rxa4 33. Rxd3 1/2-1/2