[Event "Olympiad-20 Final D"]
[Site "Skopje"]
[Date "1972.10.05"]
[Round "9"]
[White "Calderon, D"]
[Black "Hasan, Hasibul"]
[Result "0-1"]

1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Nc3 h6 5. e3 Be7 6. Bd3 dxc4 7. Bxc4 a6 8. O-O b5 9. Bd3 Bb7 10. a3 Nbd7 11. b4 c6 12. Ne4 Nxe4 13. Bxe4 Nf6 14. Bc2 a5 15. Bd2 axb4 16. axb4 Rxa1 17. Qxa1 Nd5 18. Qb2 O-O 19. e4 Nb6 20. Qb3 Nc4 21. Bc3 Qc7 22. Bd3 Nb6 23. Bd2 Ra8 24. Bc2 Nc4 25. Bc3 Ra3 26. Qb1 Rxc3 27. Bb3 Rxf3 28. Bxc4 Rc3 29. Bd3 Qd6 30. Rd1 Qxd4 31. Qb2 Qxb4 0-1