[Event "Olympiad-19 Preliminaries D"]
[Site "Siegen"]
[Date "1970.09.12"]
[Round "8"]
[White "Patterson, Nicholas J"]
[Black "Bilek, Istvan"]
[Result "1/2-1/2"]

1. g3 c5 2. Bg2 Nc6 3. Nf3 g6 4. O-O Bg7 5. c4 e6 6. e3 Nge7 7. d4 O-O 8. Nc3 d6 9. d5 Na5 10. Nd2 a6 11. Qe2 Rb8 12. a4 exd5 13. Nxd5 Nxd5 14. Bxd5 Bf5 15. Ne4 Re8 16. Nc3 Qd7 17. Rd1 Nc6 18. Bd2 Nb4 19. Be1 Nc2 20. Ra2 Nb4 21. Raa1 1/2-1/2