[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.07.01"]
[Round "7"]
[White "Jonk, Geert Jan"]
[Black "Van Os, Albert"]
[Result "1/2-1/2"]
[ECO "B23"]
[WhiteElo "1856"]
[BlackElo "1842"]
[PlyCount "101"]
[EventDate "2008.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 a6 3. g3 b5 4. Bg2 Bb7 5. d3 e6 6. Nh3 b4 7. Ne2 d5 8. 0-0 Be7 9. e5 h5 10. Nef4 g6 11. c4 bxc3 12. bxc3 Qc7 13. Rb1 Bc6 14. c4 d4 15. Nd5 Qd8 16. Nxe7 Nxe7 17. Bg5 Qc7 18. Bf6 Rg8 19. Bxe7 Kxe7 20. Re1 Nd7 21. Bxc6 Qxc6 22. Qd2 Rgb8 23. Qg5+ Ke8 24. Qf4 Rxb1 25. Rxb1 Rb8 26. Re1 Ke7 27. Ng5 Rf8 28. Ne4 Kd8 29. Rb1 Kc7 30. Nd6 f6 31. exf6 e5 32. Qe4 Kxd6 33. Qxg6 Rxf6 34. Qxh5 e4 35. dxe4 Qxe4 36. Rf1 Ne5 37. f4 Nxc4 38. Qh8 Ke7 39. Qg7+ Rf7 40. Qg5+ Kd6 41. Qh6+ Qe6 42. Qh8 Qe3+ 43. Kg2 Qe2+ 44. Kg1 Kc7 45. Qa8 Qe3+ 46. Kg2 Re7 47. Qa7+ Kd6 48. Qxa6+ Kd5 49. Qa8+ Kd6 50. Qa6+ Kd5 51. Qa8+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.24"]
[Round "6"]
[White "Wagemans, Ed"]
[Black "Jonk, Geert Jan"]
[Result "1/2-1/2"]
[ECO "B40"]
[WhiteElo "1955"]
[BlackElo "1856"]
[PlyCount "58"]
[EventDate "2008.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. g3 b5 5. Bg2 Bb7 6. d3 d6 7. 0-0 g6 8. Bg5 Qc7 9. Qd2 Bg7 10. Rad1 Nc6 11. Ne2 Rc8 12. c3 a5 13. d4 Nce7 14. dxc5 dxc5 15. Bf4 Qd8 16. Qxd8+ Rxd8 17. Rxd8+ Kxd8 18. Ng5 Ke8 19. Bc7 h6 20. Rd1 Nc6 21. Nf3 Nf6 22. Ne5 Nxe5 23. Bxe5 Rg8 24. Bc7 a4 25. Bb6 Nd7 26. Bc7 Bf6 27. Nf4 Bd8 28. Bd6 Be7 29. Bc7 Bd8 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.17"]
[Round "5"]
[White "Jonk, Geert Jan"]
[Black "Van Ketel, Raoul"]
[Result "0-1"]
[ECO "C05"]
[WhiteElo "1856"]
[BlackElo "2302"]
[PlyCount "50"]
[EventDate "2008.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4 c5 6. c3 Nc6 7. Ndf3 Qb6 8. a3 cxd4 9. cxd4 Na5 10. b4 Nc4 11. Bxc4 dxc4 12. d5 a5 13. dxe6 fxe6 14. Qc2 axb4 15. Qxc4 bxa3 16. Nd4 Bb4+ 17. Ke2 Nc5 18. Nb5 0-0 19. Nf3 Ra4 20. Nfd4 Bd7 21. Nd6 Ba5 22. Qc2 Rxd4 23. Be3 Ba4 24. Qa2 Qa6+ 25. Kf3 Rdxf4+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.10"]
[Round "4"]
[White "Leeuwenburgh, Evert"]
[Black "Jonk, Geert Jan"]
[Result "1/2-1/2"]
[ECO "B48"]
[WhiteElo "2000"]
[BlackElo "1856"]
[PlyCount "82"]
[EventDate "2008.05.20"]
[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 e6 2. e4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Be3 Qc7 6. Nc3 a6 7. a3 Nf6 8. Be2 b5 9. f3 Nxd4 10. Qxd4 Bb7 11. Rd1 Rc8 12. 0-0 Bc5 13. Qxc5 Qxc5 14. Bxc5 Rxc5 15. Rd2 Ke7 16. Nd1 d5 17. e5 Nd7 18. f4 g5 19. fxg5 Rg8 20. h4 h6 21. Bh5 Nxe5 22. Rdf2 hxg5 23. Rxf7+ Nxf7 24. Rxf7+ Kd6 25. Rxb7 Rxc2 26. Rb6+ Kc5 27. Rxe6 gxh4 28. Bf3 h3 29. b4+ Kd4 30. Ne3 Rc1+ 31. Kh2 hxg2 32. Bxg2 Rh8+ 33. Kg3 Rc3 34. Kf2 Rh2 35. Nf5+ Kd3 36. Kg3 Rh5 37. Kg4 Rxf5 38. Kxf5 Rxa3 39. Bxd5 Ra4 40. Re4 Kc3 41. Bb7 Rxb4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.03"]
[Round "3"]
[White "Jonk, Geert Jan"]
[Black "Van den Berg, Ad"]
[Result "0-1"]
[ECO "B56"]
[WhiteElo "1856"]
[BlackElo "2194"]
[PlyCount "52"]
[EventDate "2008.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f3 Qb6 7. Nb3 e6 8. Bg5 h6 9. Bh4 a6 10. Qd2 Qc7 11. a4 Be7 12. Bf2 b6 13. Be2 0-0 14. 0-0 Rb8 15. Rfd1 Rd8 16. f4 Na5 17. Nd4 Nc4 18. Qc1 Bb7 19. Bd3 Rbc8 20. Nde2 Ng4 21. Bd4 e5 22. fxe5 dxe5 23. Bxc4 exd4 24. Nd5 Qxh2+ 25. Kf1 Bxd5 26. Bxd5 Ne3+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.05.27"]
[Round "2"]
[White "De Leur, Ben"]
[Black "Jonk, Geert Jan"]
[Result "0-1"]
[ECO "A25"]
[WhiteElo "2000"]
[BlackElo "1856"]
[PlyCount "136"]
[EventDate "2008.05.20"]
[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. Nc3 Nc6 3. g3 f5 4. Bg2 Nf6 5. d3 Bb4 6. e3 Bxc3+ 7. bxc3 d6 8. Ne2 0-0 9. 0-0 Kh8 10. Rb1 e4 11. d4 Qe8 12. Nf4 Qf7 13. Qe2 g5 14. Nd5 Be6 15. Rxb7 Nxd5 16. cxd5 Bxd5 17. Qb5 Nd8 18. Rxc7 Qxc7 19. Qxd5 Qc6 20. Qxc6 Nxc6 21. Ba3 Rf6 22. f3 exf3 23. Bxf3 Rc8 24. c4 Na5 25. c5 Nc4 26. Bb4 Nxe3 27. cxd6 Nxf1 28. d7 Rd8 29. Be7 Rff8 30. Kxf1 Kg7 31. Bc6 h6 32. Ke2 Kf7 33. Bc5 Ke6 34. Ke3 Rf7 35. d5+ Ke5 36. Bxa7 Rdxd7 37. Bb8+ Rd6 38. a4 Rf8 39. Bc7 Rc8 40. Bxd6+ Kxd6 41. a5 Kc5 42. a6 Rc7 43. Bb7 Re7+ 44. Kd3 Kb6 45. Kd4 Re4+ 46. Kd3 Ra4 47. d6 Ra3+ 48. Kd4 f4 49. gxf4 gxf4 50. Ke5 f3 51. d7 Kc7 52. Ke6 f2 53. Bg2 Rxa6+ 54. Ke7 Rd6 55. Bh3 Rxd7+ 56. Bxd7 f1Q 57. h3 Qe2+ 58. Be6 Qe5 59. h4 Qg7+ 60. Bf7 Kc6 61. h5 Qg5+ 62. Ke6 Kc5 63. Bg6 Kd4 64. Bf7 Qe5+ 65. Kd7 Qf6 66. Bg6 Ke5 67. Ke8 Kd6 68. Bf5 Qe7# 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.05.20"]
[Round "1"]
[White "Jonk, Geert Jan"]
[Black "Renes, David"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1856"]
[PlyCount "39"]
[EventDate "2008.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. 0-0 Nf6 5. Re1 0-0 6. c3 d6 7. h3 a6 8. d4 Ba7 9. Na3 Bd7 10. Nc2 Na5 11. Bd3 Qc8 12. Kh2 Nc6 13. Bg5 Nh5 14. Nh4 f6 15. Qxh5 fxg5 16. Qxg5 Rxf2 17. Rf1 Qf8 18. Bc4+ Kh8 19. Ng6+ hxg6 20. Qh4# 1-0

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.12"]
[Round "9"]
[White "De Bruijn, Edwin"]
[Black "Jonk, Geert Jan"]
[Result "0-1"]
[ECO "D53"]
[PlyCount "134"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 e6 4. Nf3 Nf6 5. Bg5 Be7 6. e3 Nbd7 7. Bd3 dxc4 8. Bxc4 b5 9. Be2 Bb7 10. 0-0 a6 11. Rc1 Rc8 12. h3 0-0 13. Qd2 Qb6 14. Rfd1 b4 15. Na4 Qa5 16. Bxf6 Nxf6 17. b3 c5 18. dxc5 Bxc5 19. Nxc5 Rxc5 20. Rxc5 Qxc5 21. Rc1 Qb6 22. Nd4 Rd8 23. Qb2 h6 24. Bf3 Bxf3 25. Nxf3 Nd5 26. Nd4 Nc3 27. Re1 a5 28. Ne2 Nxe2+ 29. Qxe2 Qd6 30. Rc1 Qd2 31. Rc2 Qd1+ 32. Qxd1 Rxd1+ 33. Kh2 Ra1 34. Kg3 g6 35. Kf3 Kg7 36. Ke4 Kf6 37. Kd4 Rd1+ 38. Ke4 Rd5 39. Kf4 g5+ 40. Kf3 h5 41. Ke2 Ke5 42. Rc4 Kd6 43. Rc2 Rc5 44. Rd2+ Kc6 45. Kf3 Kb5 46. Ke2 a4 47. Kd1 axb3 48. axb3 Rc3 49. Rb2 h4 50. Kd2 f5 51. Ke2 Kc5 52. Kd2 Kd5 53. Ke2 Ke5 54. Kd2 g4 55. Ke2 gxh3 56. gxh3 Ke4 57. f3+ Ke5 58. Kf2 f4 59. e4 Kd4 60. Rd2+ Rd3 61. Rxd3+ Kxd3 62. e5 Kc3 63. Ke1 Kxb3 64. Kd2 Kc4 65. Kc2 Kd5 66. Kb3 Kxe5 67. Kxb4 Kd4 0-1

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.11"]
[Round "7"]
[White "Den Hartog, Tim"]
[Black "Jonk, Geert Jan"]
[Result "0-1"]
[ECO "A00"]
[PlyCount "32"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 dxe4 3. Nxe4 Nf6 4. Nxf6+ exf6 5. Bc4 Bd6 6. d4 0-0 7. Be3 Nd7 8. Ne2 Nb6 9. Bb3 Bg4 10. Qd2 Re8 11. 0-0-0 c6 12. f3 Be6 13. Nf4 Bxb3 14. axb3 a5 15. c3 a4 16. b4 Nc4 0-1

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.11"]
[Round "8"]
[White "Jonk, Geert Jan"]
[Black "Visser, Henk Jan"]
[Result "0-1"]
[ECO "B76"]
[PlyCount "72"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 0-0 8. Qd2 Nc6 9. 0-0-0 Nxd4 10. Bxd4 Be6 11. Kb1 Qc7 12. g4 Rfc8 13. h4 Qa5 14. a3 Rab8 15. h5 b5 16. Nd5 Qxd2 17. Nxf6+ Bxf6 18. Rxd2 Bxd4 19. Rxd4 g5 20. Rh2 Rc5 21. a4 b4 22. b3 a5 23. Kb2 Rbc8 24. Rhd2 Rc3 25. R4d3 Kg7 26. Rf2 h6 27. Rxc3 Rxc3 28. Be2 Kf6 29. Bd1 Ke5 30. Rd2 Kf4 31. Rd3 Rxd3 32. cxd3 Ke3 33. Kc2 Bc8 34. d4 Ba6 35. f4 Kxf4 36. e5 dxe5 0-1

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.10"]
[Round "6"]
[White "Van den Berg, Hette Jan"]
[Black "Jonk, Geert Jan"]
[Result "1/2-1/2"]
[ECO "C11"]
[PlyCount "118"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 d5 2. e4 e6 3. Be3 Nf6 4. Nc3 dxe4 5. f3 exf3 6. Nxf3 Be7 7. Bc4 c6 8. 0-0 0-0 9. Qd3 Nd5 10. Nxd5 exd5 11. Bb3 b5 12. c3 Bf6 13. Rf2 g6 14. Raf1 Bf5 15. Qd1 Bg4 16. h3 Bxf3 17. Qxf3 Bg7 18. Qg3 Nd7 19. Bg5 f6 20. Bc1 Rf7 21. a4 a6 22. h4 Ra7 23. h5 Nf8 24. Bc2 g5 25. Qh3 h6 26. Re1 Rae7 27. Ref1 Rc7 28. b3 Qd6 29. Be3 Rce7 30. Re2 Re8 31. Rfe1 Rfe7 32. Qf3 bxa4 33. bxa4 Qa3 34. Bd2 Rxe2 35. Rxe2 Rxe2 36. Qxe2 Qb2 37. Qd3 Qb7 38. Qe3 Qd7 39. Bd3 a5 40. c4 f5 41. Bxa5 dxc4 42. Bxc4+ Kh8 43. Bb6 c5 44. Bxc5 Qxa4 45. Qe2 Qa1+ 46. Kh2 Qc1 47. Bxf8 Bxd4 48. Bg7+ Kh7 49. Bxd4 Qf4+ 50. Kh1 Qxd4 51. Qe7+ Qg7 52. Qxg7+ Kxg7 53. g3 Kf6 54. Kg2 Ke5 55. Kf3 Kd4 56. Bb5 Ke5 57. g4 fxg4+ 58. Kxg4 Kf6 59. Bd3 Kg7 1/2-1/2

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.09"]
[Round "4"]
[White "Jonk, Geert Jan"]
[Black "Lieven, Menno"]
[Result "1/2-1/2"]
[ECO "C42"]
[PlyCount "36"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Bc4 Nxe4 4. Nc3 Nxc3 5. dxc3 Be7 6. Nxe5 0-0 7. 0-0 d6 8. Nd3 Nc6 9. a3 a6 10. Re1 Qd7 11. Qf3 Qf5 12. Bd5 Qxf3 13. Bxf3 Bf6 14. Bd2 Bf5 15. Be4 Bxe4 16. Rxe4 Rfe8 17. Rae1 Kf8 18. f3 h6 1/2-1/2

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.09"]
[Round "5"]
[White "Jonk, Geert Jan"]
[Black "Snuverink, Laurens"]
[Result "0-1"]
[ECO "B77"]
[PlyCount "62"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Be3 Bg7 6. Nc3 Nf6 7. Qd2 0-0 8. f3 d6 9. Bc4 Bd7 10. a3 Rc8 11. Ba2 Ne5 12. Bh6 Bxh6 13. Qxh6 Qb6 14. 0-0-0 Nc4 15. Bxc4 Rxc4 16. Nde2 Rfc8 17. h4 Qa5 18. h5 g5 19. Rd3 Kh8 20. Rhd1 Ng8 21. Rd5 Qxd5 22. Rxd5 Nxh6 23. Rxg5 f6 24. Rg3 Nf7 25. Nf4 Rg8 26. Rxg8+ Kxg8 27. Nfd5 Kf8 28. Ne3 Rc8 29. Kd2 Ne5 30. b3 Be8 31. h6 Nf7 0-1

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.08"]
[Round "2"]
[White "Jonk, Geert Jan"]
[Black "De Boer, Richard"]
[Result "1-0"]
[ECO "B34"]
[PlyCount "67"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Be3 Nf6 6. f3 Bg7 7. Qd2 d6 8. c3 Bd7 9. Be2 a6 10. Bh6 0-0 11. h4 Nh5 12. g4 Ng3 13. Rh2 e5 14. Nxc6 Bxc6 15. b3 Nxe2 16. Kxe2 Qf6 17. h5 Bxh6 18. Qxh6 Qg7 19. Qe3 g5 20. Nd2 Qf6 21. Rd1 Rad8 22. c4 h6 23. Nf1 Qe7 24. Ng3 Rd7 25. Nf5 Qe6 26. Ke1 Kh7 27. Rhd2 Rfd8 28. Qb6 f6 29. Qb4 b5 30. cxb5 Bxb5 31. Rxd6 Rxd6 32. Rxd6 Qc8 33. Rxd8 Qc1+ 34. Rd1 1-0

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.08"]
[Round "3"]
[White "Van Weersel, Arlette"]
[Black "Jonk, Geert Jan"]
[Result "1-0"]
[ECO "B20"]
[PlyCount "87"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. c4 e5 3. Nc3 d6 4. d3 Nf6 5. f4 Nbd7 6. Nf3 a6 7. Be2 exf4 8. Bxf4 Be7 9. 0-0 0-0 10. Qd2 b6 11. Rae1 Bb7 12. Bd1 Nh5 13. Be3 Nhf6 14. Bf2 Ng4 15. Bg3 Nge5 16. Nd5 Bxd5 17. exd5 Bf6 18. Re4 Qc7 19. Nh4 Bxh4 20. Rxh4 Ng6 21. Rh3 Rae8 22. Qg5 Nde5 23. Qd2 Re7 24. b3 Rfe8 25. Bh5 Qb8 26. d4 cxd4 27. Qxd4 Qc7 28. Bf2 b5 29. c5 Qxc5 30. Qxc5 dxc5 31. Bxc5 Rd7 32. d6 Red8 33. Re3 f6 34. Rfe1 Rc8 35. b4 a5 36. a3 axb4 37. axb4 Nc4 38. Bg4 Nxe3 39. Bxd7 Rxc5 40. bxc5 Nc2 41. Re8+ Kf7 42. c6 Ne5 43. Re7+ Kg6 44. c7 1-0

[Event "NED-ch U20 op"]
[Site "Hengelo"]
[Date "2000.08.07"]
[Round "1"]
[White "Heltzel, Joost"]
[Black "Jonk, Geert Jan"]
[Result "1-0"]
[ECO "A07"]
[PlyCount "87"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. 0-0 0-0 5. d3 d5 6. Nbd2 Bf5 7. c3 c6 8. Qc2 Qc8 9. Re1 Re8 10. e4 Bh3 11. Bh1 h6 12. e5 Nfd7 13. d4 e6 14. Nf1 c5 15. Qd1 Nc6 16. Nh4 Qd8 17. b3 Rc8 18. Ne3 cxd4 19. cxd4 Nxd4 20. f4 Qb6 21. Rb1 Rc7 22. Bg2 Bxg2 23. Kxg2 Rec8 24. Nxd5 Qc6 25. Qxd4 Qxd5+ 26. Qxd5 exd5 27. Kh1 Rc2 28. Be3 Rxa2 29. Rbd1 Ra5 30. Bg1 b6 31. e6 fxe6 32. Rxe6 Nf8 33. Rd6 Rb5 34. R1xd5 Rxb3 35. Nxg6 Nxg6 36. Rxg6 Rb1 37. Rd7 Rcc1 38. Rgxg7+ Kf8 39. Kg2 Rxg1+ 40. Kh3 a5 41. Rh7 Kg8 42. Rdg7+ Kf8 43. Ra7 Kg8 44. Rhb7 1-0

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.14"]
[Round "9"]
[White "Den Heeten, Djurre"]
[Black "Jonk, Geert Jan"]
[Result "1-0"]
[ECO "B24"]
[PlyCount "61"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 d6 3. g3 e6 4. Bg2 Nc6 5. f4 Be7 6. Nf3 a6 7. d3 b5 8. Be3 Bb7 9. 0-0 Qc7 10. Ne2 Nf6 11. h3 0-0 12. c3 d5 13. e5 Nd7 14. g4 c4 15. d4 a5 16. f5 h6 17. Qd2 f6 18. fxe6 Nb6 19. Nf4 Rfe8 20. Nh5 Qd8 21. Bxh6 Bf8 22. exf6 gxf6 23. Nh4 Rxe6 24. Ng6 Bd6 25. Bg7 Be7 26. Qh6 Na7 27. Nxe7+ Qxe7 28. Nxf6+ Rxf6 29. Bxf6 Qh7 30. Qg5+ Kf8 31. Bd8+ 1-0

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.13"]
[Round "7"]
[White "Jonk, Geert Jan"]
[Black "De Jong, Roderick"]
[Result "1-0"]
[ECO "C56"]
[PlyCount "103"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. e5 Ne4 6. 0-0 Be7 7. Re1 Nc5 8. Nxd4 Nxd4 9. Qxd4 0-0 10. Nc3 c6 11. Be3 d5 12. exd6 Qxd6 13. Qxd6 Bxd6 14. Rad1 Be7 15. Bd4 Ne6 16. Be5 b5 17. Bb3 a5 18. a3 Bc5 19. Ne4 Ba7 20. Nd6 Bb8 21. Nxc8 Rxc8 22. Bxb8 Raxb8 23. Bxe6 fxe6 24. Rxe6 Rb7 25. Rdd6 Rbc7 26. f3 Kf7 27. Kf2 g6 28. g3 a4 29. h3 b4 30. axb4 Rb8 31. c3 c5 32. Rb6 Rxb6 33. Rxb6 cxb4 34. Rxb4 a3 35. bxa3 Rxc3 36. a4 Rc5 37. g4 Ra5 38. Re4 Kf6 39. h4 h6 40. Ke3 Rd5 41. Rd4 Re5+ 42. Kd3 Rc5 43. Rc4 Re5 44. Kd4 Ra5 45. Kc3 Re5 46. Kb4 Re3 47. Rc3 Re1 48. a5 Rh1 49. a6 Ke5 50. a7 Ra1 51. Ra3 Rb1+ 52. Ka4 1-0

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.13"]
[Round "8"]
[White "Jonk, Geert Jan"]
[Black "Van Dommelen, Martin"]
[Result "1/2-1/2"]
[ECO "B28"]
[PlyCount "28"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Nxd4 e5 5. Nb3 Nf6 6. Nc3 Bb4 7. Bd3 d5 8. Bd2 dxe4 9. Nxe4 Bxd2+ 10. Qxd2 0-0 11. Rd1 Bg4 12. f3 Bf5 13. 0-0 Nxe4 14. Bxe4 Qf6 1/2-1/2

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.12"]
[Round "6"]
[White "Stevens, Frank"]
[Black "Jonk, Geert Jan"]
[Result "0-1"]
[ECO "B20"]
[PlyCount "60"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. a3 e6 3. b4 cxb4 4. axb4 Bxb4 5. c3 Be7 6. d4 d6 7. f4 b6 8. Bd3 Bb7 9. Nf3 Nd7 10. 0-0 f6 11. Qe2 Qc7 12. Nh4 g6 13. f5 exf5 14. exf5 Nf8 15. fxg6 hxg6 16. Bxg6+ Kd8 17. Qg4 Nh6 18. Bxh6 Rxh6 19. Be4 Rxh4 20. Qxh4 f5 21. Qh8 Bxe4 22. Nd2 Bd3 23. Rfe1 Qxc3 24. Nf3 Kd7 25. Qg7 Be4 26. h4 Ne6 27. Qg3 Bxf3 28. gxf3 Qxd4+ 29. Kh1 Bxh4 30. Qh3 Bxe1 0-1

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.11"]
[Round "5"]
[White "Huebner, Werner"]
[Black "Jonk, Geert Jan"]
[Result "0-1"]
[ECO "B50"]
[PlyCount "108"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. d3 e6 5. Nbd2 Be7 6. d4 Nbd7 7. h3 a6 8. a4 b6 9. Be2 Bb7 10. Qc2 Qc7 11. b3 Rc8 12. Bd3 cxd4 13. Nxd4 Qxc3 14. Qxc3 Rxc3 15. Bc2 Rc7 16. Bd3 Nc5 17. Be2 Ncxe4 18. Nxe4 Nxe4 19. 0-0 Bf6 20. Be3 0-0 21. Rad1 Nc3 22. Rd2 Bxd4 23. Bxd4 Nxe2+ 24. Rxe2 Rc6 25. b4 Rc4 26. Bxb6 Rxb4 27. Bc7 Rxa4 28. Bxd6 Rd8 29. Bc7 Rd7 30. Rc1 h6 31. Rb2 Bd5 32. Be5 Ra2 33. Rxa2 Bxa2 34. Ra1 Bc4 35. Bc3 f6 36. Ra4 Bb5 37. Rg4 Kf7 38. h4 Ra7 39. Bd4 Ra8 40. Rg3 a5 41. Ra3 a4 42. Bc5 Rc8 43. Be3 Rc4 44. f3 h5 45. g3 Rb4 46. Bc5 Rb3 47. Kf2 e5 48. Ra2 Bc6 49. Ra3 Ke6 50. Bf8 g6 51. Bc5 Kd5 52. Bf8 f5 53. Be7 Kc4 54. Bf6 Rxa3 0-1

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.11"]
[Round "4"]
[White "Jonk, Geert Jan"]
[Black "Drewes, Benno"]
[Result "1/2-1/2"]
[ECO "C41"]
[PlyCount "92"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e5 2. d4 Nc6 3. Nf3 d6 4. h3 f5 5. Nc3 Nf6 6. exf5 Bxf5 7. Bc4 h6 8. 0-0 Qd7 9. Re1 0-0-0 10. dxe5 dxe5 11. Qxd7+ Nxd7 12. Bb3 Bd6 13. Be3 Kb8 14. a3 g5 15. Rad1 Nf6 16. Rd2 e4 17. Nd4 Nxd4 18. Bxd4 Rhf8 19. Bxf6 Rxf6 20. Rde2 a6 21. Nxe4 Bxe4 22. Rxe4 Bc5 23. R4e2 Rdf8 24. Rf1 h5 25. c3 g4 26. hxg4 hxg4 27. g3 Rh8 28. Bd5 c6 29. Bg2 Rhf8 30. Rd2 Ka7 31. b4 Bb6 32. c4 c5 33. Rd7 R8f7 34. Rxf7 Rxf7 35. Bd5 Rf6 36. Kg2 cxb4 37. axb4 Bd4 38. f3 gxf3+ 39. Rxf3 Rb6 40. Rb3 Rf6 41. Rf3 Rxf3 42. Kxf3 b5 43. g4 Bc3 44. cxb5 axb5 45. g5 Bxb4 46. g6 Bc3 1/2-1/2

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.10"]
[Round "3"]
[White "Damminga, Francis"]
[Black "Jonk, Geert Jan"]
[Result "1/2-1/2"]
[ECO "A46"]
[PlyCount "44"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. Bg5 Be7 4. Nbd2 Nc6 5. e3 a6 6. c3 d5 7. Bd3 h6 8. Bh4 Nd7 9. Bxe7 Qxe7 10. 0-0 0-0 11. e4 dxe4 12. Nxe4 f5 13. Ned2 b5 14. Re1 Qf7 15. Bc2 Nb6 16. Ne5 Nxe5 17. Rxe5 Bb7 18. a4 Nd5 19. Qf3 Rab8 20. Qg3 Qf6 21. Rae1 Ba8 22. b3 c6 1/2-1/2

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.10"]
[Round "2"]
[White "Jonk, Geert Jan"]
[Black "Zoutman, Floris"]
[Result "1/2-1/2"]
[ECO "B45"]
[PlyCount "64"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be3 Bb4 7. f3 d5 8. Bb5 Bd7 9. 0-0 Bxc3 10. bxc3 dxe4 11. fxe4 0-0 12. Bd3 Ne5 13. Bg5 Nxd3 14. cxd3 e5 15. Nf5 Bxf5 16. Rxf5 Qb6+ 17. Kh1 Nd7 18. Qd2 f6 19. Be3 Qc7 20. Rh5 Rfd8 21. Rh3 Nc5 22. Bxc5 Qxc5 23. Qb2 b6 24. Rf3 Rac8 25. Rc1 Rc7 26. h3 Rcd7 27. Rd1 b5 28. Qb3+ Kh8 29. Qb2 Qc6 30. Re3 Qc5 31. Rf3 a5 32. Kh2 Qc6 1/2-1/2

[Event "NED U16 op"]
[Site "Hengelo"]
[Date "1999.08.09"]
[Round "1"]
[White "Kamstra, Jippe"]
[Black "Jonk, Geert Jan"]
[Result "1-0"]
[ECO "B92"]
[PlyCount "73"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nf3 Nbd7 8. 0-0 h6 9. Be3 Qc7 10. Qd2 b5 11. a4 b4 12. Nd5 Nxd5 13. exd5 Nf6 14. Rac1 Bb7 15. Qxb4 Nxd5 16. Qd2 Be7 17. c4 Nxe3 18. Qxe3 0-0 19. Bd3 f5 20. c5 e4 21. cxd6 Qxd6 22. Bc4+ Kh8 23. Rcd1 Qc7 24. Nd2 Bg5 25. Qe2 Qc6 26. Nb3 Qc7 27. Nd4 Qe7 28. Ne6 Rf6 29. Nxg5 hxg5 30. Rd4 f4 31. Rfd1 Qe5 32. Rd8+ Rxd8 33. Rxd8+ Kh7 34. Qh5+ Rh6 35. Bg8+ Kh8 36. Bf7+ Kh7 37. Bg6# 1-0

