[Event "Interzonal-06"]
[Site "Amsterdam"]
[Date "1964.06.01"]
[Round "10"]
[White "Portisch, Lajos"]
[Black "Pachman, Ludek"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 Nc6 7. O-O a6 8. h3 h6 9. a3 dxc4 10. Bxc4 Bd6 11. e4 e5 12. Be3 Re8 13. Re1 exd4 14. Bxd4 Nxd4 15. Qxd4 Bf8 16. e5 Nh7 17. Qf4 Be6 18. Bxe6 fxe6 19. Rad1 Qe7 20. Qe4 c6 21. Nh4 Rad8 22. Rxd8 Rxd8 23. Rd1 Rxd1+ 24. Nxd1 Qd7 25. Nc3 Bc5 26. Nf3 Nf8 27. Qg4 Be7 28. Ne4 Qd3 29. Nfd2 b5 30. Qf3 Qd4 31. Qc3 Qxc3 32. Nxc3 Nd7 33. Nf3 c5 34. Kf1 Kf7 35. Ke2 c4 36. a4 b4 37. Ne4 Nb6 38. Nfd2 1/2-1/2