[Event "Zonal South America Sao Paulo"]
[Site "Sao Paulo"]
[Date "1972.??.??"]
[Round "20"]
[White "Vasquez, Julio E"]
[Black "Silva Nazzari, Roberto"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. cxd5 Nxd5 7. Bc4 Nxc3 8. bxc3 c5 9. O-O cxd4 10. cxd4 Nc6 11. Ba3 Bg4 12. Be2 Rc8 13. Rb1 Qd7 14. Qb3 Rc7 15. Rfd1 Bf5 16. Rbc1 Na5 17. Qb4 Nc6 18. Qa4 Rfc8 19. h3 1/2-1/2