[Event "Amsterdam IBM"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[EventDate "1971.07.13"]
[Round "11"]
[Result "0-1"]
[White "Hans Ree"]
[Black "Robert G Hartoch"]
[ECO "E62"]
[WhiteElo "2382"]
[BlackElo "2198"]
[PlyCount "62"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O
7. d4 d6 8. d5 Nb8 9. c5 a5 10. cxd6 cxd6 11. Nd2 Na6 12. Nc4
Nc5 13. f4 exf4 14. Bxf4 Ra6 15. e4 b5 16. Nxd6 Rxd6 17. e5 b4
18. exf6 Rxf6 19. Ne4 Nxe4 20. Bxe4 g5 21. Bc1 Rxf1+ 22. Qxf1
Re8 23. Qd3 f5 24. Bxf5 Qb6+ 25. Kg2 Ba6 26. Qf3 Re2+ 27. Kh3
Qh6+ 28. Kg4 Rxh2 29. Be6+ Kh8 30. Bxg5 Qg6 31. Qf7 Be2+ 0-1