[Event "Olympiad-20 Preliminaries A"]
[Site "Skopje"]
[Date "1972.09.25"]
[Round "7"]
[White "Westerinen, Heikki MJ"]
[Black "Petrosian, Tigran V"]
[Result "0-1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Qc7 6. O-O Nf6 7. c4 Nc6 8. Nxc6 dxc6 9.
Be3 e5 10. h3 Be6 11. Nc3 Nd7 12. Nd5 Qd8 13. b4 f6 14. Nc3 Bxb4 15. Qb3 Qa5 16. Rfc1 O-O
17. Rab1 Ba3 18. Rd1 b5 19. Bf1 Kh8 20. Bd2 Bc5 21. Qc2 Qc7 22. cxb5 axb5 23. Be1 Qa7 24.
Rb2 Bd4 25. Rbb1 Rfc8 26. Rdc1 Nb6 27. Qe2 Qf7 28. Rc2 Nc4 29. Rbc1 Na3 30. Rb2 Rcb8 0-1