[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.28"]
[Round "7"]
[White "Zwetsloot, Piet"]
[Black "Bloothoofd, Gerrie"]
[Result "0-1"]
[ECO "A25"]
[WhiteElo "1806"]
[BlackElo "1921"]
[PlyCount "26"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. g3 Nc6 3. Bg2 f5 4. Nc3 Nf6 5. e3 d5 6. Nxd5 Nxd5 7. cxd5 Nb4 8. Qb3 e4 9. Ne2 Nd3+ 10. Kf1 Bd6 11. Nd4 Qf6 12. f4 Bxf4 13. gxf4 Qh4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.21"]
[Round "6"]
[White "Hordijk, Frank"]
[Black "Zwetsloot, Piet"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "1597"]
[BlackElo "1806"]
[PlyCount "43"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Nc3 Bg7 4. e4 d6 5. Be3 c6 6. Qd2 Bg4 7. Ng5 h6 8. Nf3 b5 9. Bd3 a6 10. Ne2 Bxf3 11. gxf3 e5 12. a4 Nbd7 13. axb5 axb5 14. Rxa8 Qxa8 15. 0-0 exd4 16. Nxd4 Ne5 17. Be2 Ke7 18. Nb3 Nc4 19. Bxc4 bxc4 20. Ra1 Qc8 21. Ra7+ Ke8 22. Qxd6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.15"]
[Round "5"]
[White "De Wit, Jerome"]
[Black "Zwetsloot, Piet"]
[Result "1-0"]
[ECO "A48"]
[WhiteElo "1712"]
[BlackElo "1806"]
[PlyCount "69"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 d6 5. Be2 0-0 6. 0-0 Nh5 7. Bg5 h6 8. Bh4 Nf6 9. Nbd2 Nbd7 10. h3 c6 11. c4 Qa5 12. a3 e5 13. b4 Qc7 14. Nb3 e4 15. Nfd2 d5 16. Qc2 Qd8 17. cxd5 cxd5 18. Rfc1 Re8 19. Nc5 g5 20. Bg3 Nf8 21. Qd1 Ng6 22. Rc3 Nh7 23. Rac1 f5 24. Bh5 Qf6 25. Qb3 Qf7 26. Bxg6 Qxg6 27. Qxd5+ Kh8 28. Nxb7 f4 29. exf4 gxf4 30. Bxf4 Nf6 31. Qc6 Bxh3 32. Rg3 Bg4 33. Nd6 Nh5 34. Nxe8 Nxg3 35. Qxg6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.07"]
[Round "4"]
[White "Zwetsloot, Piet"]
[Black "Thissen, Thomas"]
[Result "0-1"]
[ECO "A89"]
[WhiteElo "1806"]
[BlackElo "1986"]
[PlyCount "82"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 f5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. 0-0 0-0 6. Nc3 Nc6 7. d4 d6 8. d5 Ne5 9. Nxe5 dxe5 10. e4 Bd7 11. Qe2 Rc8 12. b3 Qe8 13. Ba3 f4 14. Rac1 Qf7 15. f3 fxg3 16. hxg3 Nh5 17. Qe1 Qf6 18. Rc2 g5 19. Bc1 Bh6 20. Ne2 Rf7 21. g4 Nf4 22. Nxf4 gxf4 23. c5 Bg5 24. Bb2 Bb5 25. Qc3 Bxf1 26. Bxf1 Kg7 27. Rh2 h6 28. Rh5 e6 29. Bc4 exd5 30. Bxd5 Re7 31. Bxb7 Rd8 32. Bd5 Qa6 33. a4 Qe2 34. Rh2 Qd1+ 35. Kg2 c6 36. Bc4 Rd2+ 37. Kh3 Rxh2+ 38. Kxh2 Bh4 39. Kg2 h5 40. gxh5 Kh6 41. Bc1 Rg7+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.01"]
[Round "3"]
[White "Zwetsloot, Piet"]
[Black "Kettenis, John"]
[Result "1-0"]
[ECO "E16"]
[WhiteElo "1806"]
[BlackElo "1494"]
[PlyCount "47"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 b6 5. 0-0 Bb7 6. d4 c5 7. cxd5 Bxd5 8. Nc3 Bb7 9. Bg5 Be7 10. dxc5 Qxd1 11. Rfxd1 Bxc5 12. Nb5 Na6 13. a3 0-0 14. Bxf6 gxf6 15. b4 Be7 16. Rd7 Bc6 17. Rxe7 Bxb5 18. Nd4 Rae8 19. Rxa7 Bc4 20. Rc1 e5 21. Nf5 Bxe2 22. Be4 Rc8 23. Rxc8 Rxc8 24. Ne7+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.05.24"]
[Round "2"]
[White "Kuiper, Machiel"]
[Black "Zwetsloot, Piet"]
[Result "1/2-1/2"]
[ECO "B14"]
[WhiteElo "1263"]
[BlackElo "1806"]
[PlyCount "84"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e3 0-0 5. Bd3 c5 6. Nf3 cxd4 7. exd4 d5 8. Be3 Nc6 9. a3 dxc4 10. Bxc4 Bg4 11. d5 Ne5 12. Be2 Bxf3 13. Bxf3 Qd7 14. Qe2 Rfd8 15. Rd1 b6 16. 0-0 Rac8 17. Rc1 Nxf3+ 18. Qxf3 Ne8 19. Rfd1 Nd6 20. Bd4 Bf8 21. b3 Nf5 22. Be3 Nxe3 23. fxe3 Bg7 24. e4 Rc5 25. Rf1 Qe8 26. Ne2 Rdc8 27. a4 h5 28. Rxc5 Rxc5 29. Rc1 Rxc1+ 30. Nxc1 Qc8 31. Qd1 Bh6 32. Ne2 Qg4 33. Qd3 Qd7 34. Nd4 Bg7 35. Nc6 e6 36. h3 exd5 37. exd5 a5 38. Qe4 Bf6 39. Kf1 Kg7 40. Ke2 Qd6 41. Kf3 Qc5 42. Qd3 Qd6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.05.17"]
[Round "1"]
[White "Zwetsloot, Piet"]
[Black "Straver, Robert"]
[Result "0-1"]
[ECO "D13"]
[WhiteElo "1806"]
[BlackElo "2143"]
[PlyCount "54"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 c6 2. d4 d5 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bf4 a6 7. e3 e6 8. Bd3 Bd6 9. Ne5 0-0 10. Rc1 Bxe5 11. Bxe5 Nxe5 12. dxe5 Nd7 13. f4 Qb6 14. Qe2 f6 15. 0-0 Nc5 16. Bb1 f5 17. Rf3 Bd7 18. Rh3 g6 19. Qf2 Rac8 20. Rd1 Bc6 21. Rd4 Rf7 22. b4 Na4 23. Ne2 Bb5 24. Bd3 Rfc7 25. g4 Bxd3 26. Rxd3 Qxb4 27. gxf5 Qb1+ 0-1

[Event "Ghent op 28th"]
[Site "Ghent"]
[Date "2005.07.16"]
[Round "1"]
[White "De Jong, Jan Willem"]
[Black "Zwetsloot, Piet"]
[Result "1-0"]
[ECO "E71"]
[WhiteElo "2334"]
[BlackElo "2035"]
[PlyCount "75"]
[EventDate "2005.07.16"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "BEL"]
[SourceTitle "CBM 107 Extra"]
[Source "ChessBase"]
[SourceDate "2005.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.09.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3 0-0 6. Bd3 e5 7. d5 c6 8. Be3 cxd5 9. cxd5 a6 10. Nge2 Nbd7 11. a3 Nc5 12. Bc2 b5 13. b4 Ncd7 14. a4 bxa4 15. Nxa4 Rb8 16. Rb1 Ne8 17. 0-0 Nc7 18. Qd2 Nb5 19. Rb3 f5 20. exf5 gxf5 21. f4 e4 22. Bf2 Kh8 23. g4 Nf6 24. g5 Nh5 25. Nb2 Qc7 26. Rc1 Qf7 27. Nc4 Bd7 28. Rbb1 Rfc8 29. Nb6 Rc7 30. Bd1 Rbb7 31. Qa2 Be8 32. Be3 h6 33. h4 Rxc1 34. Rxc1 Nc7 35. Ba4 Bxa4 36. Qxa4 hxg5 37. hxg5 Kg8 38. Kf2 1-0

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2005.06.??"]
[Round "?"]
[White "Wiggerman, Jan"]
[Black "Zwetsloot, Piet"]
[Result "0-1"]
[ECO "E62"]
[BlackElo "2035"]
[PlyCount "58"]
[EventDate "2005.06.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 106 Extra"]
[Source "ChessBase"]
[SourceDate "2005.07.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 0-0 5. 0-0 d6 6. c4 Nc6 7. Nc3 e5 8. d5 Ne7 9. e4 h6 10. b4 a5 11. Qb3 axb4 12. Qxb4 Nd7 13. Be3 f5 14. c5 dxc5 15. Bxc5 Nxc5 16. Qxc5 b6 17. Qc4 Kh7 18. Rfe1 Ba6 19. Qb3 f4 20. Rad1 Nc8 21. Rc1 Nd6 22. Bf1 fxg3 23. Bxa6 gxf2+ 24. Kxf2 Rxa6 25. Ke3 Qf6 26. Rf1 Qf4+ 27. Kd3 Qg4 28. Ke3 h5 29. Qd1 Bh6+ 0-1

[Event "Vlissingen HZ op 08th"]
[Site "Vlissingen"]
[Date "2004.08.07"]
[Round "1"]
[White "Kniest, Oliver"]
[Black "Zwetsloot, Piet"]
[Result "1-0"]
[ECO "A69"]
[WhiteElo "2324"]
[PlyCount "41"]
[EventDate "2004.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 0-0 6. Nf3 c5 7. d5 e6 8. Be2 exd5 9. cxd5 Re8 10. e5 dxe5 11. fxe5 Ng4 12. Bg5 Qb6 13. 0-0 Nxe5 14. d6 Be6 15. Nxe5 Bxe5 16. Nd5 Qxd6 17. Nf6+ Kf8 18. Qxd6+ Bxd6 19. Rad1 Be5 20. Nxe8 Kxe8 21. Rd8# 1-0

[Event "Ghent op 19th"]
[Site "Ghent"]
[Date "1996.??.??"]
[Round "2"]
[White "Hogenacker, Jacques"]
[Black "Zwetsloot, Piet"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2320"]
[BlackElo "1970"]
[PlyCount "43"]
[EventDate "1996.07.20"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "BEL"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 d6 2. f4 g6 3. Nf3 Bg7 4. Nc3 Nf6 5. Bc4 Nxe4 6. Nxe4 d5 7. Bd3 dxe4 8. Bxe4 Nd7 9. d4 Nf6 10. Bd3 c5 11. c3 cxd4 12. Nxd4 0-0 13. 0-0 Qb6 14. Kh1 Rd8 15. f5 gxf5 16. Qe1 e6 17. Qh4 Qc5 18. Bg5 e5 19. Nxf5 Rxd3 20. Nxg7 Ng4 21. Nh5 Be6 22. Rae1 1-0

[Event "NED Open-ch13"]
[Site "Dieren"]
[Date "1982.08.??"]
[Round "8"]
[White "Zwetsloot, Piet"]
[Black "Daamen, Ferry"]
[Result "0-1"]
[ECO "A05"]
[PlyCount "75"]
[EventDate "1982.06.??"]
[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 c5 2. Nf3 d6 3. d3 Nc6 4. g3 g6 5. Bg2 Bg7 6. 0-0 Nf6 7. Nbd2 0-0 8. Nh4 Qc7 9. c3 Rb8 10. f4 e6 11. Rf2 b5 12. Nf1 b4 13. Bd2 a5 14. Ne3 Ba6 15. Qc2 bxc3 16. bxc3 Rb6 17. Raf1 Qb8 18. Bc1 Ne7 19. Ba3 Nd7 20. f5 exf5 21. exf5 Nxf5 22. Nhxf5 gxf5 23. Nxf5 Ne5 24. c4 Bb7 25. Bxb7 Qxb7 26. Nxg7 Kxg7 27. Qd2 f6 28. Bc1 d5 29. Qh6+ Kg8 30. Rf4 Qg7 31. Qxg7+ Kxg7 32. cxd5 Rd6 33. d4 Nd3 34. Rg4+ Kf7 35. dxc5 Rxd5 36. c6 Rc8 37. Rc4 Ne5 38. Rc3 0-1

