[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.13"]
[Round "1"]
[White "Evans, Larry Melvyn"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. c4 Nf6 2. d4 e6 3. Nf3 Bb4+ 4. Bd2 Qe7 5. Qc2 Bxd2+ 6. Nbxd2 d6 7. e4 e5 8. d5 O-O 9. g3 a5 10. Bg2 Nh5 11. O-O Na6 12. Ne1 Nc5 13. Nd3 b6 14. Rae1 Nxd3 15. Qxd3 Qg5 16. Qe3 Qxe3 17. Rxe3 f5 18. exf5 Bxf5 19. Be4 Bh3 20. Bg2 Bf5 21. Be4 Bh3 22. Bg2 Bf5 23. Be4 Bh3 24. Bg2 Bf5 1/2-1/2