[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.12"]
[Round "9"]
[White "Overduin, Derk"]
[Black "Dekker, Sonja"]
[Result "1-0"]
[ECO "C27"]
[PlyCount "45"]
[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. Bc4 Bc5 3. Nc3 Nf6 4. d3 h6 5. f4 d6 6. h3 0-0 7. Nf3 Nc6 8. Bd2 a6 9. Qe2 Qe7 10. 0-0-0 Nh5 11. Nd5 Qd8 12. Qe1 Be6 13. f5 Bc8 14. g4 Nf6 15. Nxf6+ Qxf6 16. g5 Qe7 17. gxh6 Kh7 18. hxg7 Kxg7 19. Qg3+ Kh7 20. Rhg1 Qf6 21. Ng5+ Kh8 22. Qh4+ Kg8 23. Qh7# 1-0

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.11"]
[Round "7"]
[White "Bisterbosch, Jasper"]
[Black "Overduin, Derk"]
[Result "1-0"]
[ECO "C22"]
[PlyCount "123"]
[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. d4 exd4 3. Qxd4 Nc6 4. Qa4 Bc5 5. Nf3 d6 6. c3 Bd7 7. Bc4 Nf6 8. 0-0 Nxe4 9. Bxf7+ Kxf7 10. Qxe4 Qf6 11. Qc4+ Be6 12. Ng5+ Ke7 13. Nxe6 Qxe6 14. Bg5+ Kd7 15. Qxe6+ Kxe6 16. Nd2 Kd7 17. b4 Bb6 18. a4 a5 19. b5 Ne5 20. Rae1 Rae8 21. g3 Rhf8 22. Kg2 Nd3 23. Rxe8 Rxe8 24. Nf3 Nb2 25. Ra1 Re2 26. Nd4 Re4 27. f3 Re5 28. h4 h6 29. Bf4 Rc5 30. Bc1 Nd3 31. Be3 Re5 32. Bf4 Rc5 33. Bd2 g6 34. Ne2 Rc4 35. Ra2 h5 36. Kh3 Nf2+ 37. Kg2 Nd1 38. Kh3 d5 39. Nf4 Nxc3 40. Bxc3 Rxc3 41. Nxg6 Rxf3 42. Ne5+ Kd6 43. Nxf3 d4 44. Rd2 Kd5 45. g4 Ke4 46. Ne1 Ke3 47. Ra2 c5 48. bxc6 bxc6 49. gxh5 d3 50. Nxd3 Kxd3 51. h6 Bd4 52. Kg2 c5 53. Kf3 c4 54. Ra3+ c3 55. Kf4 Kd2 56. Ke4 c2 57. Ra2 Kd1 58. Rxc2 Bf6 59. Rc5 Bxh4 60. Rxa5 Bf6 61. Rf5 Ba1 62. Rf1+ 1-0

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.11"]
[Round "8"]
[White "Overduin, Derk"]
[Black "Dekker, Els"]
[Result "0-1"]
[ECO "C25"]
[PlyCount "86"]
[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. Bc4 Nc6 3. d3 Bc5 4. Nc3 d6 5. f4 exf4 6. Bxf4 Nb8 7. Qd2 Qe7 8. 0-0-0 Nf6 9. Bg5 c6 10. Kb1 h6 11. Bf4 b5 12. Bb3 a5 13. a4 b4 14. Nce2 Na6 15. Nf3 Bb6 16. d4 Nxe4 17. Qe3 d5 18. Rhe1 0-0 19. Ng3 Qf6 20. Be5 Qe7 21. Nxe4 dxe4 22. Qxe4 Be6 23. Bf4 Rfe8 24. Qxc6 g5 25. Bd6 Qd8 26. d5 Rc8 27. Qxe8+ Qxe8 28. dxe6 fxe6 29. Bxe6+ Kg7 30. Bxc8 Qxc8 31. Re7+ Kg6 32. Ne5+ Kh5 33. g4+ Kh4 34. Ng6+ Kxg4 35. h3+ Kh5 36. Ne5 Qxh3 37. Rh7 Be3 38. Bf8 g4 39. Nf7 Qf3 40. Ka2 Qxd1 41. Bxh6 b3+ 42. Kxb3 Nc5+ 43. Kc3 Qd4# 0-1

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.10"]
[Round "6"]
[White "Overduin, Derk"]
[Black "Jacobs, Jos"]
[Result "0-1"]
[ECO "C30"]
[PlyCount "74"]
[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. Bc4 Nf6 3. d3 Bc5 4. Nc3 Nc6 5. f4 d6 6. Nf3 Bg4 7. h3 Bh5 8. g4 Nxg4 9. hxg4 Bxg4 10. Bxf7+ Kxf7 11. Ng5+ Qxg5 12. fxg5 Bxd1 13. Nxd1 Nd4 14. Rf1+ Ke7 15. Rf2 Rhf8 16. Rg2 Rf3 17. c3 Ne6 18. Ke2 Raf8 19. Ne3 Rh3 20. Nf5+ Kd7 21. Bd2 g6 22. Ng3 Nf4+ 23. Bxf4 exf4 24. Rf1 Ke7 25. d4 Bb6 26. Rgf2 Rxg3 27. Rxf4 Rxf4 28. Rxf4 Rxg5 29. Rh4 h5 30. Kf2 c5 31. d5 c4+ 32. Kf3 Kf6 33. Kf4 Rg2 34. b4 Rc2 35. Rh3 g5+ 36. Kg3 Rxc3+ 37. Kg2 Rxh3 0-1

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.09"]
[Round "5"]
[White "Cramwinckel, Gideon"]
[Black "Overduin, Derk"]
[Result "0-1"]
[ECO "C21"]
[PlyCount "37"]
[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. d4 f5 3. Qh5+ g6 4. Qf3 Nc6 5. exf5 Nxd4 6. Qe4 Ne7 7. fxg6 Nxg6 8. Nf3 d5 9. Qd3 Bf5 10. Qc3 Nxc2+ 11. Kd1 d4 12. Qb3 Nxa1 13. Qc4 Bc2+ 14. Ke1 Bxb1 15. Ng5 Qf6 16. Qxc7 Bb4+ 17. Ke2 Qa6+ 18. Kf3 Qc6+ 19. Qxc6+ 0-1

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.09"]
[Round "4"]
[White "Overduin, Derk"]
[Black "Hijweegen, Claudia"]
[Result "0-1"]
[ECO "C02"]
[PlyCount "70"]
[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 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. g3 Bd7 7. Be3 cxd4 8. Nxd4 Bc5 9. Qd2 Nxe5 10. Bg2 Ne7 11. b4 Bxd4 12. Bxd4 Qc7 13. Qf4 Nd3+ 14. Kf1 Nxf4 15. gxf4 f6 16. Be3 Nf5 17. Bd2 Kf7 18. Na3 Bc6 19. Nc2 Nh4 20. Nd4 Nxg2 21. Kxg2 e5 22. fxe5 fxe5 23. Nf3 d4 24. cxd4 Bxf3+ 25. Kxf3 Qc6+ 26. Ke2 Qe4+ 27. Be3 exd4 28. f3 Qxe3+ 29. Kf1 Rhe8 30. Kg2 Rac8 31. Rhf1 Rc2+ 32. Kh1 Qh6 33. Rf2 Rxf2 34. h4 Qxh4+ 35. Kg1 Qh2# 0-1

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.08"]
[Round "2"]
[White "Overduin, Derk"]
[Black "Van Elteren, Hugo"]
[Result "0-1"]
[ECO "B07"]
[PlyCount "78"]
[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 d6 2. Bc4 Nf6 3. d3 g6 4. Nc3 Bg7 5. f4 Nc6 6. Nf3 Na5 7. Bd5 c6 8. Bxf7+ Kxf7 9. b4 Nxe4 10. Nxe4 Bxa1 11. c3 h6 12. Bd2 d5 13. Nf2 Bb2 14. 0-0 b5 15. bxa5 Ba3 16. Ne5+ Kg7 17. Qa1 Qc7 18. Re1 Bd6 19. c4 Kh7 20. Bc3 Rf8 21. g3 Bd7 22. h4 h5 23. Qc1 Bc5 24. d4 Bd6 25. c5 Bxe5 26. Rxe5 Rf7 27. Qe3 Re8 28. Nd3 Bf5 29. Ne1 Be4 30. g4 Qd7 31. Bd2 Qxg4+ 32. Kf2 Ref8 33. Qg3 Rxf4+ 34. Bxf4 Rxf4+ 35. Qxf4 Qxf4+ 36. Ke2 Qg4+ 37. Kd2 e6 38. Rg5 Qxh4 39. Rg1 Qf2+ 0-1

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.08"]
[Round "3"]
[White "Van Eerd, Marieke"]
[Black "Overduin, Derk"]
[Result "0-1"]
[ECO "C50"]
[PlyCount "20"]
[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 Nc6 3. Bc4 Bc5 4. Ng5 Qxg5 5. d4 Qxg2 6. Rf1 Nxd4 7. Na3 Nf3+ 8. Ke2 Nxh2 9. Kd2 Nxf1+ 10. Ke1 Qxf2# 0-1

[Event "NED-ch U16 op"]
[Site "Hengelo"]
[Date "2000.08.07"]
[Round "1"]
[White "Porte, Henrik"]
[Black "Overduin, Derk"]
[Result "1-0"]
[ECO "D09"]
[PlyCount "57"]
[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 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 Bc5 6. Bg2 Be6 7. Bg5 f6 8. exf6 Nxf6 9. 0-0 Qd7 10. a3 Bxc4 11. Qc2 Na5 12. b4 d3 13. exd3 Bxd3 14. Re1+ Be7 15. Qc3 Nc6 16. Rd1 0-0-0 17. Ne1 Nd5 18. Qxd3 Bxg5 19. Qxd5 Qg4 20. Bf3 Qh3 21. Qxg5 h5 22. Rxd8+ Rxd8 23. Bxh5 Kb8 24. Qg4 Qxg4 25. Bxg4 Re8 26. Nc3 Re5 27. Nf3 Re7 28. Re1 Rd7 29. Bxd7 1-0

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.14"]
[Round "9"]
[White "Bisterbosch, Jasper"]
[Black "Overduin, Derk"]
[Result "0-1"]
[ECO "C55"]
[PlyCount "72"]
[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. Nc3 Bc5 4. Bc4 d6 5. 0-0 Nf6 6. Ng5 0-0 7. Nxf7 Rxf7 8. Bxf7+ Kxf7 9. h3 Be6 10. d3 h6 11. Be3 Qd7 12. g4 Rh8 13. Kg2 h5 14. Kg3 hxg4 15. hxg4 Bxg4 16. f3 Rh3+ 17. Kf2 Rxf3+ 18. Qxf3 Bxf3 19. Kxf3 Qg4+ 20. Kf2 Qh4+ 21. Ke2 Bxe3 22. Kxe3 Nd4 23. Rac1 Qg3+ 24. Kd2 Kg8 25. Rce1 Nf3+ 26. Rxf3 Qxf3 27. Nb5 Qf2+ 28. Kd1 c6 29. Nc7 Kf7 30. c3 Qb6 31. Rf1 Qxc7 32. Kc2 b5 33. b4 d5 34. exd5 cxd5 35. Kb3 e4 36. dxe4 Qc4+ 0-1

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.13"]
[Round "8"]
[White "Overduin, Derk"]
[Black "Wisgerhof, Jan Willem"]
[Result "0-1"]
[ECO "C00"]
[PlyCount "98"]
[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 e6 2. Nf3 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ Qxf6 6. d3 Qd8 7. Bf4 Nc6 8. Qd2 Qf6 9. 0-0-0 Ba3 10. c3 Bc5 11. Bg5 Qf5 12. d4 Bd6 13. Bd3 Qa5 14. a3 f6 15. Bf4 e5 16. dxe5 fxe5 17. Rhe1 Be6 18. Qe2 Bg4 19. h3 Bxf3 20. gxf3 0-0-0 21. Bg3 g6 22. f4 exf4 23. Qg4+ Kb8 24. Bxf4 Bxf4+ 25. Qxf4 Rhf8 26. Qh4 Qb6 27. Re2 Rh8 28. Kc2 Na5 29. b4 Nc6 30. Rde1 a6 31. Qf6 a5 32. b5 Na7 33. Qxh8 Rxh8 34. Re8+ Rxe8 35. Rxe8+ Nc8 36. Rf8 c6 37. Bc4 cxb5 38. Be2 Qc6 39. Bg4 Qe4+ 40. Kd2 Ka7 41. Bxc8 b4 42. f3 Qe7 43. Rh8 bxc3+ 44. Kc2 Qxa3 45. Rxh7 Qb2+ 46. Kd3 Qd2+ 47. Kc4 Qf4+ 48. Kxc3 Qxf3+ 49. Kc4 Qc6+ 0-1

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.13"]
[Round "7"]
[White "Overduin, Derk"]
[Black "Zijlmans, Martijn"]
[Result "1-0"]
[ECO "B50"]
[PlyCount "65"]
[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. Bc4 Nf6 4. Nc3 g6 5. d3 Bg7 6. Be3 0-0 7. Qd2 Ng4 8. Bf4 Bh8 9. h3 Nf6 10. Bh6 Bg7 11. Qg5 Nfd7 12. Nh4 e6 13. Qxd8 Rxd8 14. Bxg7 Kxg7 15. 0-0-0 Nc6 16. f4 Nb6 17. Rhf1 d5 18. exd5 exd5 19. Bb5 Nd4 20. Rde1 Bd7 21. Bxd7 Rxd7 22. f5 gxf5 23. Nxf5+ Nxf5 24. Rxf5 d4 25. Ne4 c4 26. Nc5 Rc7 27. Re4 Kg6 28. g4 cxd3 29. Nxd3 Rd8 30. Nf4+ Kg7 31. Nh5+ Kg6 32. h4 d3 33. Rf6# 1-0

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.12"]
[Round "6"]
[White "Reinders, Johanneke"]
[Black "Overduin, Derk"]
[Result "0-1"]
[ECO "C20"]
[PlyCount "54"]
[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. Qh5 Nc6 3. Bb5 Nf6 4. Qf3 Nd4 5. Qd1 Nxb5 6. c3 d6 7. Qa4 Bd7 8. d4 Nxd4 9. Qd1 Nc6 10. Na3 Be7 11. Bg5 Be6 12. Bxf6 Bxf6 13. g3 Qd7 14. f3 0-0-0 15. g4 Bh4+ 16. Kd2 d5 17. Rc1 dxe4+ 18. Kc2 Qd3+ 19. Qxd3 exd3+ 20. Kb1 f5 21. Re1 Bxe1 22. Nh3 fxg4 23. Ng5 d2 24. b3 d1Q+ 25. Kb2 Rd2+ 26. Nc2 Qxc2+ 27. Ka3 Qxa2# 0-1

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.11"]
[Round "5"]
[White "Overduin, Derk"]
[Black "Van den Berg, Harmen"]
[Result "0-1"]
[ECO "C00"]
[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 e6 2. Nf3 d5 3. Nc3 Bb4 4. a3 Ba5 5. b4 Bb6 6. d4 a5 7. b5 c5 8. bxc6 Nxc6 9. Be3 Nge7 10. Bb5 0-0 11. e5 Bd7 12. Rb1 Nf5 13. 0-0 Rc8 14. Qd2 f6 15. Rfe1 fxe5 16. Bg5 Qc7 17. Nxe5 Nxe5 18. Rxe5 Bxd4 19. Bxd7 Bxc3 20. Bxe6+ Kh8 21. Qxd5 Bxe5 22. Bxc8 Rxc8 23. Rxb7 Qd6 24. Qxd6 Nxd6 25. Rd7 h6 26. Be3 Rxc2 27. f4 Nc4 28. fxe5 Nxe3 29. e6 Ng4 30. h3 Rc1+ 0-1

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.11"]
[Round "4"]
[White "Van der Blom, Floris"]
[Black "Overduin, Derk"]
[Result "0-1"]
[ECO "C64"]
[PlyCount "49"]
[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. Bb5 Bc5 4. Nc3 d6 5. d4 exd4 6. Nxd4 Bxd4 7. Qxd4 Bd7 8. Qxg7 Qf6 9. Qxf6 Nxf6 10. Bg5 Ng4 11. h3 Nge5 12. Nd5 Rc8 13. Bh6 Nd4 14. Bxd7+ Nxd7 15. 0-0-0 c6 16. Nf4 Nb5 17. a4 Nc7 18. Rxd6 Ne5 19. Rhd1 f5 20. Bg7 Nf7 21. Bxh8 Nxd6 22. Rxd6 Ke7 23. Be5 fxe4 24. Rh6 Rh8 25. Bxh8 0-1

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.10"]
[Round "3"]
[White "Overduin, Derk"]
[Black "Dekker, Els"]
[Result "1-0"]
[ECO "C50"]
[PlyCount "79"]
[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 Bc5 4. Nc3 d6 5. d3 Bg4 6. 0-0 Nd4 7. h3 Bxf3 8. gxf3 Nf6 9. Kh1 Qd7 10. Kh2 0-0-0 11. Rg1 g6 12. f4 Nc6 13. Be3 Nd4 14. Ne2 Nf3+ 15. Kg2 Nxg1 16. Nxg1 Bxe3 17. fxe3 h6 18. c3 exf4 19. exf4 Rdg8 20. Qb3 b6 21. Bxf7 Rg7 22. Be6 Nh5 23. Bxd7+ Kxd7 24. Ne2 g5 25. f5 g4 26. Qa4+ Kd8 27. Kh2 g3+ 28. Kg2 a5 29. Rf1 Rhg8 30. Rf3 Kc8 31. f6 Rf7 32. Qc4 Rgf8 33. Qe6+ Kb7 34. Nxg3 Nxf6 35. Nh5 Nxh5 36. Rxf7 Rg8+ 37. Kh2 Ka6 38. Qc4+ b5 39. Qc6+ Ka7 40. Rxc7+ 1-0

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.10"]
[Round "2"]
[White "Sarneel, Job"]
[Black "Overduin, Derk"]
[Result "1-0"]
[ECO "D31"]
[PlyCount "40"]
[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 e6 2. c4 d5 3. Nc3 Bb4 4. Bd2 dxc4 5. e4 Nc6 6. Nf3 Nge7 7. Bxc4 Nxd4 8. Nxd4 Qxd4 9. Be2 Bxc3 10. Bxc3 Qxe4 11. 0-0 b6 12. Bf3 Qg6 13. Bxa8 c6 14. Qf3 e5 15. Bxc6+ Nxc6 16. Rac1 Bb7 17. Bxe5 0-0 18. Rc3 Rb8 19. Bxb8 Ba6 20. Re1 Bb5 1-0

[Event "NED U14 op"]
[Site "Hengelo"]
[Date "1999.08.09"]
[Round "1"]
[White "Overduin, Derk"]
[Black "Willemze, Annemieke"]
[Result "0-1"]
[ECO "B50"]
[PlyCount "62"]
[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. Bc4 Nc6 4. d3 Nf6 5. Nc3 e6 6. Be3 Be7 7. Qd2 a6 8. a4 0-0 9. h4 d5 10. e5 d4 11. exf6 Bxf6 12. Ne4 dxe3 13. Nxf6+ Qxf6 14. Qxe3 Qxb2 15. Qc1 Qc3+ 16. Ke2 Nb4 17. Ra3 Qxc2+ 18. Qxc2 Nxc2 19. Rb3 Nd4+ 20. Nxd4 cxd4 21. h5 h6 22. g4 Bd7 23. Rxb7 Bc6 24. Rg1 Bxb7 25. g5 hxg5 26. Rxg5 Kh7 27. Rg4 Bc6 28. Rxd4 Bxa4 29. Ba2 Bb5 30. Ke3 Rad8 31. Re4 Rxd3+ 0-1

[Event "Orange op"]
[Site "Orange"]
[Date "1993.??.??"]
[Round "?"]
[White "Littke, Adam"]
[Black "Overduin, Derk"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "2255"]
[PlyCount "27"]
[EventDate "1993.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "FRA"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 g6 2. e4 d6 3. Nc3 Bg7 4. Nf3 Nf6 5. Be2 0-0 6. 0-0 Nbd7 7. e5 dxe5 8. dxe5 Ng4 9. e6 Nde5 10. exf7+ Nxf7 11. Bc4 Qxd1 12. Rxd1 h6 13. Nd5 e6 14. Nxc7 1-0

