[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "14"]
[White "Hartoch, Robert G"]
[Black "Ree, Hans"]
[Result "1/2-1/2"]

1. c4 g6 2. g3 Bg7 3. Bg2 e5 4. Nc3 d6 5. e3 Nc6 6. Nge2 Nge7 7. Rb1 Be6 8. Nd5 Qd7 9. b4 O-O 10. d3 Nd8 11. O-O c6 12. Nxe7+ Qxe7 13. Bd2 Qd7 14. Qc2 a6 15. Nc1 Bh3 16. Nb3 Bxg2 17. Kxg2 Ne6 18. Rbe1 f5 19. f4 Rae8 20. Bc3 g5 21. Kh1 Rf7 22. Qb2 b5 23. Rd1 exf4 24. exf4 gxf4 25. gxf4 c5 26. Na5 Qd8 27. Qg2 Kh8 28. Be1 Nd4 29. Nc6 Qa8 30. Nxd4 Qxg2+ 31. Kxg2 Bxd4 32. bxc5 dxc5 33. cxb5 axb5 34. Rd2 Rfe7 35. Bf2 Re2 36. Rxe2 Rxe2 37. Kg3 Bxf2+ 38. Rxf2 Re3+ 39. Rf3 Re2 40. Rf2 Re3+ 41. Kh4 Rxd3 42. Kg5 Kg7 43. Kxf5 c4 44. Rb2 Rd5+ 45. Ke6 Rc5 46. Rg2+ Kf8 47. a3 1/2-1/2