[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.29"]
[Round "14"]
[White "Evans, Larry Melvyn"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qc7 5. Nc3 e6 6. g3 a6 7. Bg2 Nf6 8. O-O Be7 9. Re1 d6 10. Nxc6 bxc6 11. e5 dxe5 12. Rxe5 Bb7 13. Re1 c5 14. Bf4 Qc8 15. Bxb7 Qxb7 16. b3 O-O 17. Qe2 c4 18. Ne4 Rfc8 19. Nd6 Bxd6 20. Bxd6 Qc6 21. Be5 Nd5 22. Bd4 Ne7 23. Rad1 Nf5 24. Ba1 h6 25. Qe5 Qf3 26. Rd2 Rc6 27. Re3 Qh5 28. Rc3 Rac8 29. Bb2 Qg5 30. Rd1 Ne7 31. Qe2 Qb5 32. a4 Qb7 33. Qe4 cxb3 34. cxb3 Nd5 35. Rf3 Rb6 36. Rdd3 Rb8 37. Bd4 Rc6 38. Kg2 f5 39. Qe5 Nf6 40. h3 Ne4 41. Be3 Rf8 1/2-1/2