Donner, Jan Hein VS Ribli, Zoltan 1973.??.??

[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "4"]
[White "Donner, Jan Hein"]
[Black "Ribli, Zoltan"]
[Result "1-0"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nc6 7. d5 Na5 8. b3 c5 9. Bb2 a6 10. O-O Rb8 11. Nd2 b5 12. Qc2 e5 13. Rae1 Nh5 14. e4 f5 15. exf5 gxf5 16. Ne2 f4 17. gxf4 Nxf4 18. Nxf4 Rxf4 19. cxb5 axb5 20. Ne4 Rb7 21. Bc1 Rg4 22. f4 exf4 23. Bxf4 Bd4+ 24. Kh1 Rbg7 25. Bg3 Nb7 26. Bf3 R4g6 27. Bh5 Rh6 28. Nf6+ Bxf6 29. Re8+ Qxe8 30. Bxe8 Bh3 31. Rg1 b4 32. Qe4 Bd4 33. Bb5 Rf6 34. Re1 Bf5 35. Qh4 Rg4 36. Re8+ Kg7 37. Re7+ Kg8 38. Re8+ Kg7 39. Qh5 Re4 40. Qg5+ 1-0