[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Amanda"]
[Black "Ondersteijn, B."]
[Result "1/2-1/2"]
[ECO "B70"]
[PlyCount "44"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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. d4 cxd4 4. Nxd4 g6 5. Bd3 Bg7 6. Nf3 Nf6 7. Nc3 0-0 8. 0-0 Nc6 9. Be3 d5 10. exd5 Nxd5 11. Nxd5 Qxd5 12. c3 Rd8 13. Be2 Qxd1 14. Bxd1 Bf5 15. Bc5 Rd7 16. Re1 Re8 17. Ba4 e6 18. Bxa7 b5 19. Bxb5 Rxa7 20. Bxc6 Rc8 21. Be4 Bxe4 22. Rxe4 Rb7 1/2-1/2

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "De Regt, Michel"]
[Black "Ondersteijn, B."]
[Result "1-0"]
[ECO "B52"]
[PlyCount "72"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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. Bb5+ Bd7 4. Bxd7+ Qxd7 5. d3 Nf6 6. Bg5 g6 7. Bxf6 exf6 8. 0-0 Bg7 9. Nc3 0-0 10. Rb1 Nc6 11. a3 a5 12. Nd5 Qd8 13. Qd2 Nd4 14. Nxd4 cxd4 15. Qf4 g5 16. Qf3 b5 17. Rfe1 Rb8 18. c3 dxc3 19. Nxc3 b4 20. axb4 axb4 21. Nd5 b3 22. Qf5 Rb5 23. Ne7+ Qxe7 24. Qxb5 Qe6 25. Qd5 Qxd5 26. exd5 f5 27. h3 g4 28. hxg4 fxg4 29. Re4 g3 30. fxg3 Be5 31. Rg4+ Kh8 32. Rb4 Bxg3 33. Rxb3 Be5 34. Rc1 Bd4+ 35. Kf1 Be3 36. Re1 Re8 1-0

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Goudriaan, Etienne"]
[Black "Ondersteijn, B."]
[Result "1-0"]
[ECO "D25"]
[PlyCount "73"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. e3 Be6 4. Nc3 Nf6 5. Nf3 Nc6 6. Be2 g6 7. 0-0 Bg7 8. e4 Na5 9. d5 Bc8 10. Bg5 0-0 11. Bxf6 Bxf6 12. e5 Bg7 13. a4 c6 14. d6 exd6 15. exd6 Nb3 16. Rb1 Bf5 17. Bxc4 Bxb1 18. Qxb3 Bf5 19. Rd1 Rb8 20. Qa3 Qd7 21. Re1 Rfd8 22. Rd1 Bc2 23. Rd2 Bf5 24. Ng5 Bh6 25. Nxf7 Bxd2 26. Ne5+ Qe6 27. Bxe6+ Bxe6 28. Ne4 Bf4 29. Nf6+ Kg7 30. Nfg4 Bxg4 31. Nxg4 Rxd6 32. g3 Rd1+ 33. Kg2 Bd6 34. Qf3 Rf8 35. Qxd1 h5 36. Qd4+ Kg8 37. Qxd6 1-0

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Muhren, Melissa"]
[Black "Ondersteijn, B."]
[Result "1/2-1/2"]
[ECO "B53"]
[PlyCount "100"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Bd7 6. Bxc6 Bxc6 7. Nc3 Nf6 8. Bg5 g6 9. Bxf6 exf6 10. Rd1 Bg7 11. Qxd6 Qxd6 12. Rxd6 0-0 13. 0-0 Rfe8 14. Re1 Bh6 15. Nd4 Rac8 16. Nxc6 bxc6 17. Rxf6 Bd2 18. Re2 Bg5 19. Rd6 Bf4 20. Rd7 a6 21. g3 Be5 22. Na4 Rcd8 23. Red2 Rxd7 24. Rxd7 a5 25. f4 Bg7 26. e5 h5 27. Rd6 Rc8 28. Nb6 Rb8 29. Rxc6 Bf8 30. Nc4 a4 31. b3 axb3 32. cxb3 Ra8 33. a4 Rb8 34. Rb6 Rxb6 35. Nxb6 Bc5+ 36. Kf1 Bxb6 37. b4 Kf8 38. a5 Bd4 39. a6 Ke8 40. Ke2 Kd7 41. Kd3 Bg1 42. Kc4 Kc6 43. b5+ Kb6 44. h3 Bf2 45. g4 hxg4 46. hxg4 Bg3 47. f5 Bxe5 48. fxg6 fxg6 49. Kb4 Bd6+ 50. Kc4 Bb8 1/2-1/2

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Ondersteijn, B."]
[Black "Spek, R."]
[Result "0-1"]
[ECO "C45"]
[PlyCount "63"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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. d4 exd4 4. Nxd4 Ne5 5. Bf4 Ng6 6. Bg3 Nf6 7. Nc3 Bc5 8. Nb3 Bb4 9. Bc4 Bxc3+ 10. bxc3 0-0 11. e5 Re8 12. Qe2 d6 13. e6 Bxe6 14. Bxe6 Rxe6 15. Qxe6 fxe6 16. 0-0 Ne4 17. Rfe1 Nxg3 18. hxg3 e5 19. c4 c5 20. Na5 Qxa5 21. Red1 Qc3 22. Rac1 Rd8 23. a4 Qxc4 24. a5 b5 25. axb6 axb6 26. c3 b5 27. f3 e4 28. fxe4 Qxe4 29. Rd2 Qe3+ 30. Rf2 Qxc1+ 31. Rf1 Qxc3 32. g4 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Ondersteijn, B."]
[Black "Swinkels, Robin"]
[Result "0-1"]
[ECO "C45"]
[PlyCount "54"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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. d4 exd4 4. Nxd4 Bc5 5. Nb3 Bb6 6. Bc4 Nf6 7. Nc3 0-0 8. 0-0 d6 9. Bg5 h6 10. Bh4 Bg4 11. Qd3 Ne5 12. Qd2 Nxc4 13. Qe1 c6 14. Bxf6 Qxf6 15. h3 Be6 16. Nd2 Nxb2 17. Rb1 Qxc3 18. Qc1 Nc4 19. Nxc4 Bxc4 20. Rd1 Qf6 21. e5 Qxf2+ 22. Kh2 Be3 23. Qa3 Be2 24. Rxd6 Bf3 25. Rxb7 Qg1+ 26. Kg3 Qf2+ 27. Kh2 Qxg2# 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Ondersteijn, B."]
[Black "Tan, Matthew"]
[Result "0-1"]
[ECO "B72"]
[PlyCount "70"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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. Nc3 Nf6 4. Bc4 g6 5. 0-0 Bg7 6. d4 cxd4 7. Nxd4 0-0 8. Be3 Bd7 9. Qd2 Ng4 10. Bf4 e5 11. Bxe5 Nxe5 12. Bb3 Nbc6 13. Nxc6 Bxc6 14. Qf4 Qf6 15. Qxf6 Bxf6 16. Rfd1 Rfd8 17. Rd2 Rd7 18. Rad1 Rad8 19. f4 Ng4 20. h3 Bxc3 21. bxc3 Nf6 22. e5 Ne4 23. Rd3 dxe5 24. Rxd7 Rxd7 25. Rxd7 Bxd7 26. fxe5 Nxc3 27. a4 Be6 28. Bxe6 fxe6 29. a5 Ne2+ 30. Kf2 Nd4 31. c3 Nc6 32. a6 b6 33. c4 Nxe5 34. c5 bxc5 35. g3 Nd7 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Satjadibrata, K."]
[Black "Ondersteijn, B."]
[Result "1/2-1/2"]
[ECO "B52"]
[PlyCount "37"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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. Bb5+ Bd7 4. Bxd7+ Nxd7 5. 0-0 g6 6. Nc3 Bg7 7. d3 Ngf6 8. Nd5 Nxd5 9. exd5 0-0 10. Re1 Ne5 11. Nxe5 dxe5 12. c4 a6 13. Be3 b6 14. Rb1 f5 15. b4 f4 16. Bd2 cxb4 17. Bxb4 a5 18. Ba3 Rf7 19. Bb2 1/2-1/2

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "7"]
[White "Ondersteijn, B."]
[Black "Thissen, Margriet"]
[Result "0-1"]
[ECO "C41"]
[PlyCount "90"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 d6 4. d5 Nce7 5. Nc3 Nf6 6. Bg5 Bg4 7. h3 Bh5 8. g4 Bg6 9. h4 Nxe4 10. Nxe4 Bxe4 11. Qe2 Bxd5 12. 0-0-0 g6 13. Bxe7 Bxf3 14. Qxf3 Bxe7 15. Bc4 0-0 16. h5 Kh8 17. hxg6 fxg6 18. Qh3 Bg5+ 19. Kb1 Qe7 20. Bd3 Rg8 21. Rh2 Raf8 22. Rdh1 Rg7 23. Be4 c6 24. Qa3 a6 25. b3 Rf4 26. Bd3 Rxg4 27. f3 Rh4 28. Rxh4 Bxh4 29. Qb4 Bg5 30. a4 c5 31. Qb6 Qf7 32. Qd8+ Bxd8 33. Be4 Qf4 34. Bxb7 Rxb7 35. Rd1 Qxf3 36. Rxd6 Qf1+ 37. Kb2 Ba5 38. Ka2 Bb4 39. Rxa6 Qxa6 40. c3 Bxc3 41. Kb1 Qf1+ 42. Kc2 Qe1 43. Kd3 Rd7+ 44. Kc4 Bd4 45. a5 Qc3+ 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "1"]
[White "Ondersteijn, B."]
[Black "Van Run, Rieke"]
[Result "0-1"]
[ECO "C47"]
[PlyCount "80"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nf3 d6 6. Nc3 Nf6 7. Bc4 Qe7 8. Bd3 Bf5 9. Qe2 Bg6 10. Bg5 h6 11. Bxf6 Qxf6 12. 0-0 0-0 13. Nd5 Qd8 14. Nf4 Nd4 15. Nxd4 Bxd4 16. Nxg6 fxg6 17. Bc4+ Kh8 18. Qd3 Bxb2 19. Rab1 Be5 20. Qd5 c6 21. Qe6 Qh4 22. h3 Qxe4 23. Kh1 Qxc2 24. Bb3 Qf5 25. Qc4 d5 26. Qh4 Qf4 27. Qxf4 Rxf4 28. Rfe1 Bd6 29. Re6 Rf6 30. Re3 Rxf2 31. Kg1 Rf6 32. Bc2 Bc5 33. Rbe1 Bxe3+ 34. Rxe3 Raf8 35. Bd3 b5 36. Re1 a5 37. Rc1 a4 38. Rxc6 Rxc6 39. Bxb5 Rc1+ 40. Kh2 Ra1 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "11"]
[White "Ondersteijn, B."]
[Black "Van der Linden, Marco"]
[Result "1-0"]
[ECO "C46"]
[PlyCount "67"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 Be7 4. Nc3 Nf6 5. d5 Nd4 6. Nxd4 exd4 7. Qxd4 c5 8. Qd3 d6 9. Bg5 a6 10. 0-0-0 Bd7 11. e5 dxe5 12. d6 Bb5 13. Nxb5 axb5 14. dxe7 Qxe7 15. Qxb5+ Kf8 16. Bxf6 Qxf6 17. Qxb7 Rxa2 18. Kb1 Qe6 19. Rd8+ Qe8 20. Rxe8+ Kxe8 21. Kxa2 f6 22. Qc8+ Kf7 23. Qxh8 e4 24. Bc4+ Kg6 25. Qe8+ Kh6 26. g4 Kg5 27. Qh5+ Kf4 28. g5 fxg5 29. Rg1 e3 30. fxe3+ Kxe3 31. Rg4 Kd2 32. Rg3 Kxc2 33. Qe2+ Kc1 34. Rg1# 1-0

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "13"]
[White "Ondersteijn, B."]
[Black "Vlug, Arthur"]
[Result "0-1"]
[ECO "B29"]
[PlyCount "86"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nf6 3. Bc4 Nxe4 4. 0-0 d5 5. Be2 g6 6. d3 Nf6 7. Nc3 Bg7 8. Bg5 Nc6 9. a3 0-0 10. b4 cxb4 11. axb4 Nxb4 12. Qc1 Qc7 13. Nb5 Qc5 14. d4 Qxc2 15. Qxc2 Nxc2 16. Rab1 Ne4 17. Bf4 a6 18. Nc7 Ra7 19. Nxd5 Nxd4 20. Nxd4 Bxd4 21. Nxe7+ Kh8 22. Rfd1 Nc3 23. Rxd4 Nxe2+ 24. Kf1 Nxd4 25. Be5+ f6 26. Bxd4 b6 27. Nxc8 Rxc8 28. Bxf6+ Kg8 29. Rxb6 Re8 30. Bd4 Rd7 31. Rb4 a5 32. Ra4 Kf7 33. g3 Rd5 34. h4 h5 35. Kg2 Re4 36. Kf1 Rexd4 37. Rxd4 Rxd4 38. Ke2 Rd8 39. Kf1 a4 40. Ke2 a3 41. Kf1 a2 42. Ke2 a1Q 43. Ke3 Qe5+ 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "6"]
[White "Van Nieuwland, D."]
[Black "Ondersteijn, B."]
[Result "1-0"]
[ECO "B32"]
[PlyCount "51"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[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 Nxd4 5. Qxd4 Nf6 6. e5 Nh5 7. Be2 g6 8. e6 fxe6 9. Qxh8 Nf6 10. Bg5 Nd5 11. Qxh7 d6 12. Qxg6+ Kd7 13. 0-0 Nb4 14. Bg4 Kc7 15. Bxe6 Bxe6 16. Qxe6 Nxc2 17. Qc4+ Kd7 18. Qxc2 Rc8 19. Qf5+ Ke8 20. Nc3 Qb6 21. Rab1 Rc7 22. Rfe1 Rd7 23. Nd5 Qc6 24. Rbc1 Qb5 25. Rc8+ Rd8 26. Nc7# 1-0

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "8"]
[White "Wennink, Mart"]
[Black "Ondersteijn, B."]
[Result "0-1"]
[ECO "B20"]
[PlyCount "22"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Bc4 Nc6 3. Qh5 g6 4. Qd5 e6 5. Qd3 Nf6 6. Nf3 Bg7 7. 0-0 0-0 8. Nh4 Ng4 9. Re1 Qxh4 10. Qe2 Qxh2+ 11. Kf1 Qh1# 0-1

