[Event "Zonal South America"]
[Site "Buenos Aires/Rio Hondo"]
[Date "1966.06.??"]
[Round "4"]
[White "Godoy Bugueno, David A"]
[Black "Rocha, Antonio Cavilhas"]
[Result "1/2-1/2"]

1. d4 Nf6 2. g3 g6 3. Nf3 Bg7 4. Bg2 O-O 5. O-O c5 6. b3 d5 7. Bb2 Ne4 8. Qc1 cxd4 9. Bxd4 Bxd4 10. Nxd4 Qb6 11. Nf3 Qf6 12. c3 Bg4 13. h3 Be6 14. Qe3 Nc6 15. Rc1 Rac8 16. Nbd2 Nd6 17. Nd4 Nxd4 18. Qxd4 Qxd4 19. cxd4 Nb5 20. e3 Nc3 21. Kf1 Bf5 22. Ke1 b5 23. b4 1/2-1/2