[Event "Zonal-8 South America (MdP-28)"]
[Site "Mar del Plata"]
[Date "1969.04.10"]
[Round "18"]
[White "Najdorf, Miguel"]
[Black "Van Riemsdijk, Herman Claudius"]
[Result "1-0"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. O-O Be7 8. d3 O-O 9. a3
Bg4 10. b4 a6 11. h3 Bf5 12. Bb2 Qd7 13. Kh2 Rad8 14. Rc1 Bf6 15. Nd2 Nd4 16. Nce4 c6 17.
Nxf6+ gxf6 18. Ne4 Qe7 19. e3 Ne6 20. Qf3 Bxe4 21. Qxe4 Ng5 22. Qg4 Qd7 23. Qh5 Qxd3 24.
f4 Ne6 25. fxe5 Qxe3 26. exf6 Rd2 27. Rce1 Nd5 28. Bc1 Rxg2+ 29. Kxg2 Nxf6 30. Qf5 1-0