[Event "NED open-ch 11"]
[Site "Dieren"]
[Date "1980.08.09"]
[Round "9"]
[White "Schweizer, DA."]
[Black "Landsman, Klaas"]
[Result "0-1"]
[ECO "A38"]
[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. Nf3 c5 2. c4 Nf6 3. Nc3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 g6 7. 0-0 Bg7 8. Nxd5 Qxd5 9. d3 0-0 10. a3 Qd6 11. Rb1 b6 12. Be3 Bb7 13. Nd2 Qd7 14. b4 cxb4 15. axb4 e5 16. Qa4 Rfd8 17. b5 Ne7 18. Bxb7 Qxb7 19. Rfe1 Rd7 20. Qb3 Nf5 21. Nc4 e4 22. dxe4 Qxe4 23. Red1 Rad8 24. Rxd7 Rxd7 25. Nd2 Rxd2 26. Bxd2 Nd4 27. Qd1 Nxe2+ 28. Kf1 Nd4 29. f3 Nxf3 30. Rb3 Qc4+ 31. Qe2 Nxd2+ 0-1

[Event "NED open-ch 11"]
[Site "Dieren"]
[Date "1980.08.01"]
[Round "3"]
[White "Ramaekers, Philippe"]
[Black "Schweizer, DA."]
[Result "1/2-1/2"]
[ECO "C84"]
[PlyCount "72"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d4 exd4 6. 0-0 Be7 7. Re1 0-0 8. e5 Ne8 9. Bf4 b5 10. Bb3 d5 11. c3 Bf5 12. cxd4 Na5 13. Nc3 Nc4 14. Qe2 c6 15. Bc2 Bxc2 16. Qxc2 Nc7 17. Ne2 Ne6 18. Rad1 a5 19. b3 Na3 20. Qd3 b4 21. Bc1 Nb5 22. Nd2 f5 23. f4 g6 24. Nf3 Qb6 25. Rf1 Ra7 26. Kh1 Bd8 27. Bd2 h6 28. g4 Rg7 29. Rg1 Kh7 30. gxf5 Rxf5 31. Rxg6 Rxg6 32. Qxf5 Nexd4 33. Nexd4 Nxd4 34. Nxd4 Qxd4 35. Qf7+ Rg7 36. Qf5+ Rg6 1/2-1/2

[Event "Gasunie-open A"]
[Site "Groningen"]
[Date "1978.12.28"]
[Round "4"]
[White "Westerman, JG."]
[Black "Schweizer, DA."]
[Result "1-0"]
[ECO "C02"]
[PlyCount "69"]
[EventDate "1978.12.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7 6. Bd3 cxd4 7. cxd4 Qb6 8. 0-0 Nxd4 9. Nxd4 Qxd4 10. Nc3 Qb6 11. a4 a6 12. a5 Qc7 13. f4 Bc5+ 14. Kh1 Ne7 15. Bd2 Rc8 16. Qh5 Bb4 17. Nb5 Bxb5 18. Bxb5+ axb5 19. Bxb4 0-0 20. Bd6 Qd7 21. Rf3 g6 22. Qg5 f6 23. Qg4 Rf7 24. b4 fxe5 25. fxe5 Rc4 26. Rxf7 Kxf7 27. Qf3+ Kg8 28. Qf6 Qc8 29. Bc5 Nf5 30. Kg1 Rxc5 31. bxc5 Qxc5+ 32. Kh1 Qd4 33. Rc1 Nd6 34. Qxe6+ Nf7 35. Rf1 1-0

[Event "NED Open-ch08 Reinbouw"]
[Site "Velp"]
[Date "1977.07.31"]
[Round "4"]
[White "Den Broeder, Guido"]
[Black "Schweizer, DA."]
[Result "1-0"]
[ECO "C55"]
[PlyCount "65"]
[EventDate "1977.07.28"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. d3 b5 7. Bb3 0-0 8. c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Nc6 12. d5 Na5 13. b3 Nd7 14. Be3 Nb6 15. Nbd2 Bd7 16. Nh2 Bg5 17. f4 Bxf4 18. Bxf4 exf4 19. Rxf4 Qg5 20. Qf3 Qg6 21. Rf1 Be8 22. Bb1 Nd7 23. e5 Nxe5 24. Qf2 Qg5 25. Ne4 Qe7 26. Nf6+ gxf6 27. Ng4 Ng6 28. Nh6+ Kh8 29. Re4 Qd8 30. Rxe8 Rxe8 31. Nxf7+ Kg7 32. Nxd8 Raxd8 33. Qxf6+ 1-0

