[Event "NED open-ch 11"]
[Site "Dieren"]
[Date "1980.08.09"]
[Round "9"]
[White "Van Wieringen, Jan"]
[Black "Nijboer, Friso"]
[Result "1-0"]
[ECO "D60"]
[PlyCount "59"]
[EventDate "1980.07.30"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nc3 Nbd7 7. Bd3 b6 8. 0-0 c5 9. Qe2 Ba6 10. b3 dxc4 11. bxc4 Rc8 12. Rac1 Ne8 13. Bxe7 Qxe7 14. Rfd1 Nd6 15. Ne4 Nxe4 16. Bxe4 Nf6 17. Bd3 Rfd8 18. Qb2 Bb7 19. Ne5 g6 20. f3 Rd6 21. Bb1 Qd8 22. Rc2 Nd7 23. Ng4 f5 24. Nh6+ Kg7 25. dxc5+ Kxh6 26. cxd6 Rc5 27. e4 Ne5 28. Qc1+ Kg7 29. f4 Nc6 30. e5 1-0

[Event "NED open-ch 11"]
[Site "Dieren"]
[Date "1980.08.07"]
[Round "8"]
[White "Van Wieringen, Jan"]
[Black "De Roode, Peter"]
[Result "0-1"]
[ECO "E15"]
[BlackElo "2245"]
[PlyCount "78"]
[EventDate "1980.07.30"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. b3 Bb4+ 6. Bd2 Be7 7. Bg2 c6 8. 0-0 d5 9. Ne5 Nfd7 10. Nd3 0-0 11. Nb4 Bb7 12. cxd5 cxd5 13. Nd3 Nc6 14. e3 Ba6 15. Bc3 Qc7 16. Re1 Rfc8 17. Bf1 Qb7 18. Nd2 Rc7 19. e4 Bxd3 20. Bxd3 Nb4 21. Bxb4 Bxb4 22. exd5 exd5 23. Qe2 Nf6 24. Ba6 Qc6 25. Rac1 Qxc1 26. Rxc1 Rxc1+ 27. Nf1 Re8 28. Qb5 Bc3 29. Qc6 Bb2 30. Qa4 g6 31. Qb4 Rd1 32. Kg2 Bxd4 33. Nd2 Bxf2 34. Nf3 Bc5 35. Qa4 Rb1 36. Qf4 Rb2+ 37. Kh3 Kg7 38. g4 Rf2 39. g5 Nh5 0-1

[Event "NED open-ch 11"]
[Site "Dieren"]
[Date "1980.08.01"]
[Round "3"]
[White "Crabbendam, Henrico"]
[Black "Van Wieringen, Jan"]
[Result "0-1"]
[ECO "C02"]
[PlyCount "62"]
[EventDate "1980.07.30"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Nge7 6. Bd3 Nf5 7. dxc5 Bxc5 8. b4 Bb6 9. b5 Na5 10. 0-0 0-0 11. Ba3 Re8 12. Nbd2 Bd7 13. Qe2 Rc8 14. Rfc1 Nh4 15. Rab1 Nxf3+ 16. Qxf3 Qg5 17. Qe2 f6 18. exf6 Qxf6 19. c4 Bc7 20. cxd5 exd5 21. Qh5 g6 22. Qxd5+ Be6 23. Qf3 Qxf3 24. Nxf3 Bxa2 25. Rxc7 Rxc7 26. Ra1 Rc3 27. Bb4 Rxd3 28. Bxa5 Bb3 29. h4 Rd1+ 30. Rxd1 Bxd1 31. Ng5 Re5 0-1

[Event "NED open-ch 11"]
[Site "Dieren"]
[Date "1980.07.31"]
[Round "2"]
[White "Van Wieringen, Jan"]
[Black "Van Kooten, Hubert"]
[Result "1-0"]
[ECO "D75"]
[PlyCount "95"]
[EventDate "1980.07.30"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. g3 Bg7 6. Bg2 Nxc3 7. bxc3 c5 8. Nf3 0-0 9. 0-0 Nc6 10. e3 Bf5 11. Ba3 cxd4 12. Nxd4 Bd7 13. Qb3 Na5 14. Qb4 Re8 15. Rfd1 Rb8 16. Rab1 Be5 17. Nb5 a6 18. Bh3 f5 19. Qc5 axb5 20. Qxe5 Nc4 21. Qd5+ e6 22. Qxd7 Nxa3 23. Qxd8 Rbxd8 24. Rxd8 Rxd8 25. Rb3 Ra8 26. Bg2 Ra7 27. Bxb7 Rxb7 28. Rxa3 Kf7 29. Rb3 Rc7 30. Rxb5 Rxc3 31. a4 Ra3 32. a5 Kf6 33. h4 g5 34. hxg5+ Kxg5 35. Kg2 Kg4 36. Re5 h5 37. Rxe6 h4 38. f3+ Kg5 39. f4+ Kh5 40. Re5 Kg4 41. gxh4 Ra2+ 42. Kf1 Rh2 43. a6 Ra2 44. Re6 Kxh4 45. Rg6 Kh3 46. Ke1 Ra3 47. Ke2 Ra1 48. Rg5 1-0

