[Event "Groningen Harmonie Mini op-C"]
[Site "Groningen"]
[Date "2002.12.29"]
[Round "4.1"]
[White "Van der Veen, Anne"]
[Black "Koekoek, Maarten"]
[Result "1-0"]
[ECO "A11"]
[WhiteElo "1533"]
[BlackElo "1676"]
[PlyCount "117"]
[EventDate "2002.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 d5 3. c4 c6 4. Bg2 Bf5 5. Qb3 Qc8 6. Nc3 e6 7. 0-0 Nbd7 8. d4 Bd6 9. Bd2 0-0 10. Rac1 dxc4 11. Qxc4 Nb6 12. Qb3 Nbd5 13. Rfd1 h6 14. Ne5 Nxc3 15. Bxc3 Nd5 16. Be1 Bh7 17. Nd3 a5 18. a3 Qc7 19. e4 Nb6 20. d5 exd5 21. exd5 c5 22. Qc3 Bxd3 23. Qxd3 Nd7 24. a4 Ne5 25. Qb3 Qd7 26. f4 c4 27. Qe3 Rfc8 28. fxe5 Bc5 29. Rd4 Qxa4 30. Bf2 Bxd4 31. Qxd4 b5 32. d6 Rab8 33. Bd5 Kh8 34. Bxf7 c3 35. e6 cxb2 36. Qxb2 Rxc1+ 37. Qxc1 Qb4 38. Qc7 Qb1+ 39. Kg2 Qe4+ 40. Kh3 Qf5+ 41. Kg2 Qe4+ 42. Kf1 Qb1+ 43. Be1 Qd3+ 44. Kg1 Qd4+ 45. Bf2 Qd1+ 46. Kg2 Qd5+ 47. Kh3 Qf5+ 48. g4 Qf3+ 49. Bg3 Kh7 50. Qc2+ Kh8 51. Qf2 Qe4 52. e7 Ra8 53. e8Q+ Rxe8 54. Bxe8 Qxe8 55. Qf4 b4 56. Qe5 Qf8 57. Qe7 Qf1+ 58. Kh4 g5+ 59. Kh5 1-0

[Event "Groningen Harmonie Mini op-C"]
[Site "Groningen"]
[Date "2002.12.27"]
[Round "2.1"]
[White "Clermonts, HJ."]
[Black "Koekoek, Maarten"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "1595"]
[BlackElo "1676"]
[PlyCount "63"]
[EventDate "2002.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 e6 5. Nf3 cxd4 6. cxd4 Nc6 7. Be2 d6 8. 0-0 dxe5 9. dxe5 Bc5 10. Nbd2 0-0 11. Ne4 Be7 12. Bb5 Bd7 13. Bxc6 Bxc6 14. Bg5 Bxg5 15. Nfxg5 h6 16. Nf3 Ne3 17. fxe3 Bxe4 18. Qd4 Bxf3 19. Rxf3 Qxd4 20. exd4 Rad8 21. Rd1 f6 22. exf6 Rxf6 23. Rxf6 gxf6 24. Kf2 e5 25. Ke3 Kf7 26. Rd3 Ke6 27. dxe5 Rxd3+ 28. Kxd3 Kxe5 29. Ke3 f5 30. g3 b5 31. b4 Kd5 32. Kd3 1/2-1/2

[Event "Groningen Harmonie Mini op-C"]
[Site "Groningen"]
[Date "2002.12.26"]
[Round "1.2"]
[White "Koekoek, Maarten"]
[Black "Risse, H."]
[Result "1-0"]
[ECO "C30"]
[WhiteElo "1676"]
[BlackElo "1600"]
[PlyCount "47"]
[EventDate "2002.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 e5 2. f4 d6 3. Nf3 Nc6 4. Bc4 Nh6 5. 0-0 f5 6. d3 Ng4 7. Ng5 d5 8. Bxd5 Bc5+ 9. Kh1 Qf6 10. h3 Nf2+ 11. Rxf2 Bxf2 12. fxe5 Qxe5 13. Nf7 Qg3 14. Nxh8 f4 15. Qh5+ Ke7 16. Qf7+ Kd6 17. Bxf4+ Ne5 18. Qf8+ Kd7 19. Bxg3 c6 20. Qxg7+ Kd6 21. Qxe5+ Kc5 22. Bc4+ Kb6 23. Bxf2+ c5 24. Qxc5# 1-0

[Event "Groningen SO ON Mini op"]
[Site "Groningen"]
[Date "2001.12.30"]
[Round "5"]
[White "Koekoek, Maarten"]
[Black "Spaans, Rob"]
[Result "0-1"]
[ECO "E81"]
[WhiteElo "1640"]
[BlackElo "1734"]
[PlyCount "28"]
[EventDate "2001.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. f3 g6 4. Be3 Bg7 5. c4 0-0 6. Nc3 Na6 7. Qd2 c5 8. Nge2 Bd7 9. Rd1 Qa5 10. Bh6 Bxh6 11. Qxh6 Nb4 12. Qd2 b5 13. cxb5 Bxb5 14. Nxb5 Nd3# 0-1

[Event "Groningen SO ON Mini op-D"]
[Site "Groningen"]
[Date "2000.??.??"]
[Round "5"]
[White "Koekoek, Maarten"]
[Black "Hartman, Albertus"]
[Result "1/2-1/2"]
[ECO "B46"]
[PlyCount "60"]
[EventDate "2000.12.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 a6 6. f4 Be7 7. Be2 g6 8. Bf3 Bf6 9. e5 Bg7 10. 0-0 Nge7 11. Be3 0-0 12. Ne4 Nd5 13. Bc1 f6 14. c4 Nb6 15. Nxc6 bxc6 16. Qd4 fxe5 17. fxe5 a5 18. b3 Rf5 19. Bb2 Bxe5 20. Qd2 Qe7 21. Bxe5 Rxe5 22. Qf4 d6 23. c5 Nd5 24. cxd6 Qg7 25. Qh4 Ba6 26. Rfd1 Rf8 27. Nc5 Bc8 28. Re1 g5 29. Qg3 Rxe1+ 30. Rxe1 Qd4+ 1/2-1/2

[Event "Groningen SO ON Mini op-D"]
[Site "Groningen"]
[Date "2000.??.??"]
[Round "1"]
[White "Koekoek, Maarten"]
[Black "Stellingwerf, Ruurd"]
[Result "1-0"]
[ECO "C30"]
[PlyCount "35"]
[EventDate "2000.12.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e5 2. f4 d6 3. Nf3 Nc6 4. Bc4 h6 5. d4 Nxd4 6. Nxd4 exd4 7. Qxd4 Qf6 8. Be3 Be7 9. 0-0 Qxd4 10. Bxd4 Bf6 11. e5 Be7 12. exd6 Bxd6 13. Bxg7 Rh7 14. Re1+ Ne7 15. Bf6 h5 16. Nc3 Be6 17. Bd3 Rh6 18. Bg7 1-0

[Event "Groningen SO ON Mini op-D"]
[Site "Groningen"]
[Date "2000.??.??"]
[Round "3"]
[White "Koekoek, Maarten"]
[Black "Wijbenga, Frits"]
[Result "1-0"]
[ECO "B80"]
[PlyCount "63"]
[EventDate "2000.12.??"]
[EventType "swiss"]
[EventRounds "5"]
[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 Nf6 5. Nc3 a6 6. f3 e6 7. Be3 b5 8. Qd2 Be7 9. g4 Nfd7 10. 0-0-0 Ne5 11. Be2 Bb7 12. h4 Nbd7 13. g5 Nb6 14. b3 Ned7 15. h5 b4 16. Nb1 d5 17. g6 h6 18. gxf7+ Kxf7 19. e5 Nxe5 20. f4 Nc6 21. Qd3 Nxd4 22. Qg6+ Kf8 23. Bxd4 Bf6 24. Bc5+ Be7 25. Rhg1 Rg8 26. Bf2 Bf6 27. Bg4 Bc8 28. Rde1 Qd6 29. Nd2 Be7 30. Rxe6 Bxe6 31. Bxe6 Nd7 32. Qf7# 1-0

[Event "Groningen SO ON Mini op-D"]
[Site "Groningen"]
[Date "2000.??.??"]
[Round "4"]
[White "Tillema, Berend"]
[Black "Koekoek, Maarten"]
[Result "0-1"]
[ECO "B70"]
[PlyCount "102"]
[EventDate "2000.12.??"]
[EventType "swiss"]
[EventRounds "5"]
[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 Nf6 5. Nc3 g6 6. Be2 Bg7 7. Be3 a6 8. Qd2 h6 9. 0-0-0 b5 10. f3 Bb7 11. g4 Nfd7 12. Nb3 Nc6 13. h4 Nb6 14. Nd4 Ne5 15. Ndxb5 axb5 16. Bxb5+ Bc6 17. Qe2 Bxb5 18. Qxb5+ Ned7 19. Bd4 0-0 20. Bxg7 Kxg7 21. f4 Qc7 22. h5 Rfb8 23. Qd3 Nc4 24. b3 Na5 25. hxg6 fxg6 26. g5 h5 27. f5 Ne5 28. Qh3 Rc8 29. Kd2 Ng4 30. Qf3 Ra6 31. fxg6 Qxc3+ 32. Qxc3+ Rxc3 33. Kxc3 Nf2 34. Rdf1 Nxh1 35. Rxh1 Kxg6 36. Rg1 Nb7 37. a4 Nc5 38. Kd4 Nxa4 39. bxa4 Rxa4+ 40. Kd5 Ra5+ 41. Ke6 Re5+ 42. Kd7 Rxe4 43. c3 Re5 44. c4 h4 45. Rg4 Kh5 46. Rg1 Rxg5 47. Re1 Re5 48. Rxe5+ dxe5 49. c5 h3 50. c6 h2 51. Kxe7 h1Q 0-1

[Event "Groningen SO ON Mini op-D"]
[Site "Groningen"]
[Date "2000.??.??"]
[Round "2"]
[White "Van der Heijden, Kasper"]
[Black "Koekoek, Maarten"]
[Result "0-1"]
[ECO "B50"]
[PlyCount "50"]
[EventDate "2000.12.??"]
[EventType "swiss"]
[EventRounds "5"]
[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. c3 Nf6 4. Be2 g6 5. d3 Nc6 6. Bg5 Bg7 7. Bxf6 Bxf6 8. d4 cxd4 9. Nxd4 Nxd4 10. cxd4 Qb6 11. Nc3 Bxd4 12. Bb5+ Kf8 13. 0-0 Bxc3 14. Bc4 Bf6 15. Qf3 h5 16. Rac1 Bg4 17. Qf4 Kg7 18. h3 Be6 19. Bxe6 fxe6 20. Kh1 Raf8 21. Qg3 Qb5 22. Rfd1 Qg5 23. Qb3 Be5 24. Rf1 Rxf2 25. Kg1 Qxg2# 0-1

[Event "Groningen ABM op"]
[Site "Groningen"]
[Date "1999.??.??"]
[Round "?"]
[White "Van der Lest, Menno"]
[Black "Koekoek, Maarten"]
[Result "0-1"]
[ECO "B01"]
[PlyCount "44"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Nf6 3. Nf3 Nxd5 4. Bc4 Bg4 5. h3 Bh5 6. 0-0 e6 7. Re1 Nc6 8. d3 Qd7 9. Bxd5 Qxd5 10. Nc3 Qd7 11. Ne4 0-0-0 12. a3 Nd4 13. g4 Nxf3+ 14. Qxf3 Bg6 15. Be3 h5 16. Bxa7 hxg4 17. hxg4 f5 18. gxf5 exf5 19. Nc5 Bxc5 20. Bxc5 Bh5 21. Qf4 Qd5 22. Kh2 Bg4+ 0-1

