[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "2"]
[White "Stein, Leonid"]
[Black "Donner, Jan Hein"]
[Result "1-0"]

1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. d4 d6 6. Nf3 Nc6 7. O-O e5 8. d5 Ne7 9. e4 Ne8
10. b4 f5 11. exf5 Nxf5 12. Ng5 a6 13. Rb1 Nd4 14. Ne2 Bg4 15. f3 Nxe2+ 16. Qxe2 Bf5 17.
Rb3 h6 18. Ne6 Bxe6 19. dxe6 c6 20. f4 Nc7 21. fxe5 Rxf1+ 22. Bxf1 Nxe6 23. Qd3 dxe5 24.
Qxg6 Nf8 25. Qc2 Ne6 26. Bxh6 Qf6 27. Bxg7 Kxg7 28. Qf2 Nd4 29. Re3 Qe7 30. Re4 Qf6 31.
Qe3 Rd8 32. Bd3 Nf3+ 33. Kg2 Ne1+ 34. Qxe1 Rxd3 35. Rxe5 Rd2+ 36. Qxd2 Qxe5 37. Kf3 Qf5+
38. Ke3 Qb1 39. Kd4 1-0