[Event "Interzonal-06"]
[Site "Amsterdam"]
[Date "1964.06.21"]
[Round "23"]
[White "Bronstein, David Ionovich"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 Qb6 8. Na4 Qa5+ 9. c3 cxd4 10. b4 Nxb4 11. cxb4 Bxb4+ 12. Bd2 Bxd2+ 13. Nxd2 b6 14. Rb1 Ba6 15. Qb3 Rc8 16. a3 Bxf1 17. Rxf1 Rc4 18. Nb2 Rc3 19. Qb4 Qxa3 20. Qxa3 Rxa3 21. Rf3 Ra2 22. Nd3 Rc2 23. Kd1 Rc3 24. Nb3 Rc4 25. f5 O-O 26. fxe6 fxe6 27. Rxf8+ Kxf8 28. Nd2 Rc3 29. Rb3 Nb8 30. Rxc3 dxc3 31. Nf3 Nc6 32. Kc2 d4 33. Nc1 a5 34. Ne2 Nb4+ 35. Kb3 c2 36. Nc1 d3 37. Kc4 Kf7 38. Kc3 Kg6 39. g4 h5 40. h3 hxg4 41. hxg4 1/2-1/2