[Event "Zuerich op"]
[Site "Zuerich"]
[Date "1988.??.??"]
[EventDate "?"]
[Round "4"]
[Result "0-1"]
[White "Joseph Willemsen"]
[Black "Herman Claudius van Riemsdijk"]
[ECO "A57"]
[WhiteElo "2335"]
[BlackElo "2330"]
[PlyCount "92"]

1. d4 c5 2. d5 Nf6 3. c4 b5 4. Nf3 g6 5. a4 bxc4 6. Nc3 d6
7. e4 Ba6 8. Nd2 Qa5 9. Qc2 Bg7 10. Bxc4 Bxc4 11. Nxc4 Qb4
12. Nd2 O-O 13. a5 Na6 14. O-O Rab8 15. Ra4 Qb7 16. Qd3 Nb4
17. Qe2 Nc2 18. Nf3 Nb4 19. Nd2 Nd7 20. Nc4 Ne5 21. Nxe5 Bxe5
22. f4 Bd4+ 23. Kh1 Qa6 24. Qxa6 Nxa6 25. Nd1 Rb3 26. Rf3 Rfb8
27. Ra3 Rxa3 28. Rxa3 Rb4 29. Bd2 Rc4 30. Bc3 Bxc3 31. Nxc3 f5
32. Kg1 fxe4 33. Kf2 Nb4 34. Rb3 a6 35. g3 Kf7 36. Ke3 Rd4
37. Nxe4 Nxd5+ 38. Kf3 Rb4 39. Ng5+ Kg8 40. Rd3 Nf6 41. Re3
Kf8 42. Ne6+ Ke8 43. b3 Rb7 44. g4 Nd5 45. Rd3 Nb4 46. Re3 Nc6
0-1