[Event "Mar del Plata International-24"]
[Site "Mar del Plata"]
[Date "1961.03.18"]
[Round "7"]
[White "Perez Perez, Francisco Jose"]
[Black "Letelier Martner, Rene"]
[Result "0-1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. cxd5 exd5 7. Bd3 Nbd7 8. Nf3 c6 9. Qc2 Re8 10. O-O Nf8 11. Rab1 Ne4 12. Bxe7 Qxe7 13. Bxe4 dxe4 14. Nd2 f5 15. b4 a6 16. a4 Be6 17. b5 axb5 18. axb5 Ng6 19. bxc6 bxc6 20. Rb6 Rac8 21. Re1 Qg5 22. f4 Qd8 23. Rb7 c5 24. Nb5 Re7 25. Rxe7 Qxe7 26. dxc5 Rxc5 27. Qa4 Qd7 28. Qa8+ Rc8 29. Qa6 Bf7 30. Nd4 Nxf4 31. Rf1 Nd5 32. Nxf5 Bg6 33. Nd6 Rd8 34. N2xe4 Nxe3 35. Qa2+ Kh8 36. Rf7 Bxf7 37. Nxf7+ Qxf7 38. Qxf7 Rd1+ 39. Kf2 Rf1+ 40. Kxe3 Rxf7 41. Nd2 0-1