[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2023.05.18"]
[Round "1"]
[White "Niemeijer, Leon"]
[Black "Kardoeus, David"]
[Result "0-1"]
[ECO "E66"]
[WhiteElo "1903"]
[BlackElo "2158"]
[PlyCount "73"]
[EventDate "2023.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 0-0 5. g3 d6 6. Bg2 c5 7. 0-0 Nc6 8. d5 Na5 9. Qd3 a6 10. Rb1 b5 11. cxb5 axb5 12. Qxb5 Bf5 13. Ra1 Qc7 14. e4 Nxe4 15. Nxe4 Bxe4 16. Qe2 Bxd5 17. Nd2 Bxg2 18. Kxg2 Rfb8 19. Rb1 c4 20. b4 cxb3 21. axb3 Qc2 22. b4 Nc6 23. b5 d5 24. Qf3 Ne5 25. Qxd5 Rd8 26. Qe4 Qa2 27. Bb2 Ra4 28. Qc2 Qd5+ 29. Kh3 Ra2 30. Qb3 Qd7+ 31. Kg2 Qb7+ 32. Kh3 Qc8+ 33. Kg2 Qa8+ 34. Kh3 Rxd2 35. b6 Qc8+ 36. Kg2 Qb7+ 37. Kh3 0-1

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2023.05.06"]
[Round "7"]
[White "Niemeijer, Leon"]
[Black "Veraart, Jan"]
[Result "1/2-1/2"]
[ECO "E04"]
[WhiteElo "1903"]
[BlackElo "1560"]
[PlyCount "109"]
[EventDate "2023.04.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Bb4+ 5. Bd2 a5 6. Bg2 0-0 7. 0-0 dxc4 8. Bxb4 axb4 9. Ne5 c3 10. bxc3 bxc3 11. Nxc3 c6 12. e3 Nbd7 13. Nd3 Ra3 14. Nb1 Ra5 15. a4 e5 16. Nd2 exd4 17. Nb3 Ra8 18. Nxd4 Qa5 19. Qc2 Nd5 20. Nb3 Qd8 21. Rfd1 Qg5 22. h4 Qh5 23. Bxd5 cxd5 24. Nf4 Qf3 25. Nd2 Qg4 26. Nxd5 Ne5 27. Ne7+ Kh8 28. Nxc8 Rfxc8 29. Qe4 Qxe4 30. Nxe4 Rc4 31. Nd6 Rcxa4 32. Rxa4 Rxa4 33. Nxb7 g6 34. Kg2 h5 35. Nd6 Ra7 36. Rd4 Ng4 37. Nc4 Re7 38. Kf3 Ne5+ 39. Nxe5 Rxe5 40. e4 Ra5 41. Kf4 Kg7 42. e5 Ra1 43. f3 Re1 44. Re4 Ra1 45. Rd4 Re1 46. Rd5 Re2 47. g4 hxg4 48. Kxg4 Re1 49. f4 Rg1+ 50. Kf3 Rh1 51. Rd7 Kf8 52. Kg3 Rg1+ 53. Kf3 Rh1 54. Kg3 Rg1+ 55. Kf3 1/2-1/2

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2023.05.05"]
[Round "6"]
[White "Guillaumond, Matthieu"]
[Black "Niemeijer, Leon"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "2010"]
[BlackElo "1903"]
[PlyCount "143"]
[EventDate "2023.04.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 cxd4 8. Nxd4 Qb6 9. Qd2 Qxb2 10. Rb1 Qa3 11. Bb5 Bb4 12. Rb3 Qa5 13. Bxc6 bxc6 14. Nxc6 Bxc3 15. Nxa5 Bxd2+ 16. Kxd2 f6 17. Bd4 fxe5 18. fxe5 0-0 19. Rf3 Rxf3 20. gxf3 Nb6 21. Rb1 Rb8 22. Bxb6 Rxb6 23. Rxb6 axb6 24. Nc6 Kf7 25. Kc3 Bd7 26. Nd4 g5 27. Kd3 Kg6 28. Ke3 Kh5 29. Kf2 Kh4 30. Kg2 h6 31. c3 Kh5 32. Kg3 Kg6 33. h4 Kh5 34. hxg5 hxg5 35. a3 b5 36. Kh3 Kh6 37. Kg4 Kg6 38. Ne2 Kh6 39. Nc1 Be8 40. Nb3 Bd7 41. Na5 Kg6 42. Nb7 Bc8 43. Nd6 Bd7 44. f4 gxf4 45. Kxf4 Bc6 46. Ke3 Kg5 47. Nf7+ Kf5 48. Kd4 Kf4 49. Kc5 Be8 50. Nd6 Bd7 51. Nxb5 Kxe5 52. a4 Ke4 53. Kd6 Bc8 54. Kc7 Ba6 55. Kb6 Bxb5 56. Kxb5 Kd3 57. a5 Kxc3 58. a6 d4 59. a7 d3 60. a8Q d2 61. Qc6+ Kb2 62. Qg2 Kc1 63. Qc6+ Kb2 64. Qh1 Kc2 65. Qe4+ Kb2 66. Qd4+ Kc2 67. Qc4+ Kb2 68. Qd3 Kc1 69. Qc3+ Kd1 70. Kc4 e5 71. Kd3 e4+ 72. Ke3 1-0

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2023.05.04"]
[Round "5"]
[White "Niemeijer, Leon"]
[Black "Van Hesselingen, Guido"]
[Result "0-1"]
[ECO "E05"]
[WhiteElo "1903"]
[BlackElo "1924"]
[PlyCount "53"]
[EventDate "2023.04.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 dxc4 7. Ne5 Nc6 8. Nxc6 bxc6 9. Bxc6 Rb8 10. Nc3 Bb7 11. Bxb7 Rxb7 12. e3 Nd5 13. Qe2 Nxc3 14. bxc3 Qd5 15. e4 Qb5 16. Qc2 c5 17. Ba3 cxd4 18. Bxe7 d3 19. Qb1 Qxb1 20. Rfxb1 Rxe7 21. Rb4 Rc8 22. Rab1 g6 23. f3 Kg7 24. Kf2 Rd7 25. Ke3 Kf6 26. Kd2 Rc6 27. R4b2 0-1

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2023.05.03"]
[Round "4"]
[White "Labruyere, Roger"]
[Black "Niemeijer, Leon"]
[Result "1-0"]
[ECO "C07"]
[WhiteElo "2160"]
[BlackElo "1903"]
[PlyCount "85"]
[EventDate "2023.04.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. Ngf3 cxd4 5. exd5 Qxd5 6. Bc4 Qd7 7. Nb3 Nc6 8. Nbxd4 Nxd4 9. Nxd4 a6 10. 0-0 Bd6 11. Bb3 Qc7 12. h4 b5 13. c3 Nf6 14. Bg5 Ne4 15. Qe2 Nxg5 16. hxg5 0-0 17. Rfd1 Bf4 18. Bc2 g6 19. Nf3 Bb7 20. Be4 Bxe4 21. Qxe4 Rfd8 22. a4 Rab8 23. axb5 Rxd1+ 24. Rxd1 Rxb5 25. b4 Bxg5 26. c4 Rf5 27. Nxg5 Rxg5 28. Qa8+ Kg7 29. Qxa6 Rg4 30. Qa1+ e5 31. Rc1 f6 32. Qc3 Qc6 33. g3 h5 34. b5 Qc5 35. Qe3 Qxe3 36. fxe3 Rxg3+ 37. Kf2 Rh3 38. c5 h4 39. c6 Rh2+ 40. Kg1 Ra2 41. c7 Ra8 42. c8Q Rxc8 43. Rxc8 1-0

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2023.05.02"]
[Round "3"]
[White "Niemeijer, Leon"]
[Black "Van Arendonk, Polle"]
[Result "0-1"]
[ECO "D85"]
[WhiteElo "1903"]
[BlackElo "1772"]
[PlyCount "110"]
[EventDate "2023.04.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 c5 8. Be3 Nc6 9. Bb5 0-0 10. Bxc6 bxc6 11. 0-0 Bg4 12. Rc1 Qa5 13. Qc2 Bxf3 14. gxf3 Rfd8 15. e5 c4 16. Qe2 Qa4 17. f4 e6 18. Rc2 Rdb8 19. Rb2 Rb5 20. Qc2 Qxc2 21. Rxc2 a5 22. a4 Rb3 23. Ra1 Rab8 24. Bc1 Bf8 25. Kg2 h5 26. Raa2 Be7 27. f3 Rd8 28. Be3 Bh4 29. Bf2 Be7 30. Be3 Ba3 31. Kf2 Rdb8 32. Ke2 Be7 33. Bc1 Kg7 34. h3 Rb1 35. Kd2 g5 36. Ke3 R8b3 37. Ke4 gxf4 38. Kxf4 Kf8 39. Kg3 Kg7 40. Kf4 Kh7 41. Kg3 Kg6 42. h4 Kf5 43. Kh3 c5 44. Kg3 cxd4 45. cxd4 c3 46. Kh3 Bb4 47. Kg3 Rxc1 48. Rxc1 Rb2 49. Rxb2 cxb2 50. Rh1 Bd2 51. Rb1 Bc3 52. Kf2 Bxd4+ 53. Ke2 Bxe5 54. Kd3 Kf4 55. Rf1 f6 0-1

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2023.05.01"]
[Round "2"]
[White "Van Egmond, Tom"]
[Black "Niemeijer, Leon"]
[Result "0-1"]
[ECO "A45"]
[WhiteElo "1767"]
[BlackElo "1903"]
[PlyCount "150"]
[EventDate "2023.04.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 g6 3. Bxf6 exf6 4. e3 Bg7 5. g3 d5 6. Bg2 c6 7. Ne2 f5 8. b3 Be6 9. Nd2 Nd7 10. 0-0 0-0 11. c4 Nb6 12. c5 Nd7 13. b4 a5 14. a3 b5 15. cxb6 axb4 16. axb4 Qxb6 17. Qb3 Rxa1 18. Rxa1 Rb8 19. Rb1 Bf8 20. Qa4 Qb5 21. Qxb5 Rxb5 22. Nf4 Rxb4 23. Rc1 Rb6 24. Nd3 Bd6 25. Nf3 h6 26. Bf1 f6 27. Be2 Kf7 28. Bd1 Nb8 29. Nd2 Bd7 30. Nb3 Na6 31. Na5 Ke7 32. Ba4 Nb8 33. Nb3 Na6 34. Na5 Nb8 35. Nb3 Kd8 36. Ndc5 Bxc5 37. Nxc5 Na6 38. Kg2 Nxc5 39. Rxc5 Kc7 40. Bd1 Bc8 41. Bf3 Be6 42. Be2 h5 43. Ra5 Bc8 44. Ra7+ Bb7 45. Ra5 Rb2 46. Kf1 Rb1+ 47. Kg2 Rb2 48. Kf1 Kb6 49. Rc5 Ra2 50. Rc1 Ba6 51. Bxa6 Rxa6 52. Rb1+ Kc7 53. Kg2 Ra2 54. Rb3 g5 55. Rb4 Rd2 56. Ra4 Kd6 57. Kf3 f4 58. gxf4 gxf4 59. Ra8 fxe3 60. Kxe3 Rc2 61. Rd8+ Ke6 62. Rh8 Rc3+ 63. Kf4 Rh3 64. Re8+ Kd7 65. Rh8 Rxh2 66. f3 h4 67. Kf5 h3 68. Kxf6 Rh1 69. f4 h2 70. Rh7+ Kd6 71. f5 c5 72. dxc5+ Kxc5 73. Rh4 d4 74. Kf7 d3 75. f6 d2 0-1

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2023.04.30"]
[Round "1"]
[White "Niemeijer, Leon"]
[Black "Knippenberg, Hidde"]
[Result "1-0"]
[ECO "E60"]
[WhiteElo "1903"]
[BlackElo "1728"]
[PlyCount "85"]
[EventDate "2023.04.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nf3 g6 4. g3 Bg7 5. Bg2 Nbd7 6. Nc3 c6 7. 0-0 0-0 8. b3 Qc7 9. Bb2 e5 10. dxe5 dxe5 11. Qc2 Nc5 12. Rad1 Bf5 13. Qc1 Rfe8 14. b4 Nce4 15. Qa1 Nd6 16. Nxe5 Rxe5 17. Nd5 Nxd5 18. cxd5 f6 19. Bxe5 fxe5 20. dxc6 bxc6 21. Qc3 e4 22. Qc5 Bf8 23. a4 Re8 24. Rc1 Bd7 25. b5 Rc8 26. Rfd1 Qb7 27. Bxe4 Nxe4 28. Qc4+ Kh8 29. Qxe4 Be8 30. Rc2 a6 31. Rcd2 Qa8 32. b6 Bf7 33. Rd7 Re8 34. b7 Qa7 35. Qf4 Bd5 36. e4 Be6 37. Qf6+ Kg8 38. Rd8 Bf7 39. b8Q Qxb8 40. Rxb8 Rxb8 41. Rd7 Rb1+ 42. Kg2 Bc4 43. Rd8 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.22"]
[Round "9"]
[White "Niemeijer, Leon"]
[Black "Van de Poel, Taco"]
[Result "1-0"]
[ECO "D75"]
[WhiteElo "1841"]
[BlackElo "1881"]
[PlyCount "119"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. g3 Bg7 6. Bg2 Nxc3 7. bxc3 c5 8. Nf3 0-0 9. 0-0 Nc6 10. Bb2 Rb8 11. e3 Na5 12. Qe2 b5 13. Ba3 b4 14. cxb4 cxb4 15. Rfb1 Qd6 16. Qe1 Nc6 17. Bb2 a5 18. a3 Rd8 19. axb4 axb4 20. Nd2 f5 21. Rc1 Bb7 22. Nb3 Rdc8 23. Nc5 e6 24. Nxb7 Rxb7 25. Ra6 Rbc7 26. Raxc6 Rxc6 27. Rxc6 Rxc6 28. Bxc6 Qxc6 29. Qxb4 h5 30. h4 Bf8 31. Qb8 Kf7 32. Qa7+ Kg8 33. Qb8 Kf7 34. Qb3 Be7 35. Qc3 Qxc3 36. Bxc3 Ba3 37. f3 Be7 38. Ba5 g5 39. hxg5 Bxg5 40. Kf2 h4 41. g4 fxg4 42. fxg4 Kg6 43. Bc7 Be7 44. Bf4 Bd8 45. Kg2 Be7 46. Kh3 Bf6 47. Bh2 Bg5 48. Bf4 Be7 49. e4 Bf6 50. Be3 Be7 51. Bf2 Bf6 52. d5 exd5 53. exd5 Kf7 54. Bxh4 Bg7 55. d6 Ke6 56. Be7 Kf7 57. Kh4 Ke6 58. Kh5 Kf7 59. g5 Ke6 60. Kg6 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.21"]
[Round "8"]
[White "Selten, Ton"]
[Black "Niemeijer, Leon"]
[Result "0-1"]
[ECO "C00"]
[WhiteElo "1809"]
[BlackElo "1841"]
[PlyCount "76"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 b6 5. g3 dxe4 6. dxe4 Bb7 7. Qe2 Nbd7 8. Bg2 g6 9. 0-0 Bg7 10. c3 0-0 11. h4 e5 12. Nh2 Nc5 13. b3 Re8 14. Ba3 Qd3 15. Rfe1 Qxc3 16. Nc4 Qd3 17. Qb2 Qd4 18. Bxc5 Qxc5 19. Rac1 Qe7 20. f3 Rad8 21. Bh3 c5 22. Nf1 Nd7 23. Nfe3 Nf8 24. Rcd1 Ne6 25. Nd5 Bxd5 26. exd5 Nd4 27. Qf2 Rxd5 28. f4 e4 29. Kh1 f5 30. Ne3 Rdd8 31. g4 Nf3 32. gxf5 Nxe1 33. fxg6 Rxd1 34. gxh7+ Kxh7 35. Nxd1 Nf3 36. Qg2 Qxh4 37. Ne3 Bd4 38. Nf5 Qe1+ 0-1

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.20"]
[Round "7"]
[White "Niemeijer, Leon"]
[Black "Klaren, Oscar"]
[Result "0-1"]
[ECO "A67"]
[WhiteElo "1841"]
[BlackElo "2003"]
[PlyCount "118"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. Bb5+ Nfd7 9. a4 0-0 10. Nf3 Na6 11. 0-0 Nb4 12. Re1 a6 13. Bf1 Re8 14. Be3 Nf6 15. Bf2 Bg4 16. Rc1 Nd7 17. h3 Bxf3 18. Qxf3 b6 19. Bc4 Ra7 20. Kh1 h6 21. g3 Kh7 22. Red1 Ra8 23. Rd2 Rb8 24. Qg2 Qe7 25. Kh2 g5 26. Re1 Qf8 27. Qf3 f5 28. exf5 Qxf5 29. Ne4 Ne5 30. Qe2 Nxc4 31. Qxc4 b5 32. Nxd6 bxc4 33. Nxf5 Rxe1 34. Bxe1 Nd3 35. Nxg7 Nxe1 36. Re2 Nf3+ 37. Kg2 Nd4 38. Re7 Rxb2+ 39. Kf1 c3 40. Ne6+ Kg8 41. Nxc5 c2 42. Re1 Rb1 43. Nd3 Rd1 44. d6 Rxd3 45. d7 Nc6 46. Ke2 Rxd7 47. Rc1 Nd4+ 48. Ke3 gxf4+ 49. gxf4 Kf7 50. a5 Kf6 51. Ke4 h5 52. h4 Rd8 53. f5 Rd7 54. Rg1 Ne2 55. Rg6+ Kf7 56. Rh6 c1Q 57. Rh7+ Kf6 58. Rxd7 Qc6+ 59. Rd5 Nc3+ 0-1

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.19"]
[Round "5"]
[White "Niemeijer, Leon"]
[Black "Warnk, Torsten"]
[Result "1-0"]
[ECO "D41"]
[WhiteElo "1841"]
[BlackElo "1709"]
[PlyCount "141"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 c5 5. cxd5 Nxd5 6. Nc3 Nc6 7. dxc5 Bxc5 8. Nxd5 Qxd5 9. Qxd5 exd5 10. a3 0-0 11. Bg2 Re8 12. b4 Bb6 13. Ra2 Be6 14. 0-0 Rad8 15. Rd2 h6 16. Bb2 Bg4 17. Rfd1 Be6 18. Nd4 Bg4 19. Nf3 Re7 20. h3 Be6 21. e3 Red7 22. Ne5 Nxe5 23. Bxe5 f6 24. Bd4 Bxd4 25. Rxd4 Kf7 26. g4 Ke7 27. f4 g6 28. Kf2 Rc8 29. Bxd5 Rc2+ 30. Kf3 Rc3 31. Bxe6 Rxd4 32. Rxd4 Kxe6 33. a4 Ra3 34. b5 Ra2 35. Re4+ Kd6 36. Rd4+ Ke6 37. Re4+ Kd6 38. f5 gxf5 39. gxf5 h5 40. Re6+ Kd5 41. Rxf6 Ke5 42. Re6+ Kxf5 43. Re4 Rh2 44. Rf4+ Kg5 45. Kg3 Re2 46. h4+ Kg6 47. Kf3 Ra2 48. Rd4 Kf6 49. Ke4 Ke6 50. Kf4 Rf2+ 51. Kg5 Rf5+ 52. Kg6 Re5 53. Rd8 Ke7 54. Rb8 b6 55. Rb7+ Kd6 56. Rxa7 Rxe3 57. Kxh5 Rg3 58. Kh6 Rg4 59. h5 Kc5 60. Kh7 Rg5 61. h6 Kb4 62. Ra6 Kc5 63. Kh8 Rg4 64. h7 Rg6 65. a5 Rd6 66. Rxb6 Rd8+ 67. Kg7 Rd7+ 68. Kg6 Rd8 69. Rb7 Kb4 70. Kg7 Kxa5 71. h8Q 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.19"]
[Round "6"]
[White "Reulink, Fred"]
[Black "Niemeijer, Leon"]
[Result "1-0"]
[ECO "A16"]
[WhiteElo "1983"]
[BlackElo "1841"]
[PlyCount "49"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. b3 e5 6. Bb2 c6 7. e4 Re8 8. Nge2 b6 9. 0-0 Bb7 10. d4 exd4 11. Nxd4 c5 12. Ndb5 Nxe4 13. Bxe4 Bxe4 14. Nd6 Bxc3 15. Bxc3 Bf5 16. Qd5 Re6 17. Nxf5 Nc6 18. Nh6+ Kf8 19. Rad1 Ke8 20. Rfe1 Qe7 21. Rxe6 fxe6 22. Qf3 e5 23. Bxe5 Rc8 24. Bd6 Qg7 25. Re1+ 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.18"]
[Round "4"]
[White "Labruyere, Roger"]
[Black "Niemeijer, Leon"]
[Result "1-0"]
[ECO "E73"]
[WhiteElo "2063"]
[BlackElo "1841"]
[PlyCount "87"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Be3 e5 7. d5 a5 8. g4 Na6 9. h4 Nc5 10. f3 h5 11. g5 Nfd7 12. Nh3 Nb6 13. Kf1 Nbd7 14. Kg2 b6 15. b3 Bb7 16. a3 Na6 17. Qc2 Re8 18. Nf2 Qe7 19. Nd3 Ndc5 20. Rhb1 Nxd3 21. Bxd3 Nc5 22. Bf1 Bc8 23. b4 Nb7 24. Kh2 f5 25. Bh3 f4 26. Bxc8 Rexc8 27. Bg1 Bf8 28. Qg2 Qd7 29. Qh3 Qxh3+ 30. Kxh3 Kf7 31. Nd1 a4 32. Nb2 Be7 33. Nd3 Rf8 34. Ra2 Kg8 35. Rc2 Rfb8 36. Rbc1 Kf8 37. c5 bxc5 38. bxc5 Ra5 39. Rb1 Raa8 40. Rcb2 dxc5 41. Nxe5 Nd6 42. Rxb8+ Rxb8 43. Rxb8+ Kg7 44. Bxc5 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.17"]
[Round "3"]
[White "Niemeijer, Leon"]
[Black "Dehn, Marcus"]
[Result "1/2-1/2"]
[ECO "E11"]
[WhiteElo "1841"]
[BlackElo "2098"]
[PlyCount "144"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 0-0 6. Bg2 d6 7. Nf3 Qe7 8. Nc3 c6 9. d5 exd5 10. cxd5 c5 11. 0-0 Bd7 12. Qd3 Na6 13. e4 Rab8 14. a4 Nb4 15. Qe2 b6 16. Rfe1 Rfe8 17. Nh4 a6 18. b3 Qe5 19. Rac1 Qh5 20. Qxh5 Nxh5 21. Bf1 g5 22. Nf3 f6 23. Nd2 b5 24. a5 Kg7 25. f3 Re7 26. Kf2 Rbe8 27. Be2 Kg6 28. Nf1 Ng7 29. g4 h5 30. h3 Re5 31. Ne3 Kf7 32. Bf1 Rh8 33. Kg2 Ne8 34. Ne2 Nd3 35. Ng3 Nxe1+ 36. Rxe1 Ng7 37. Rc1 Ree8 38. Be2 Rh6 39. Bf1 Reh8 40. Rc2 hxg4 41. hxg4 Rh2+ 42. Kg1 Rxc2 43. Nxc2 Rc8 44. Ne3 Ke7 45. Kf2 Rh8 46. Kg2 Ne8 47. Be2 Nc7 48. Ngf1 b4 49. Bc4 Nb5 50. Nd2 Nd4 51. Ndf1 Bb5 52. Nd2 Kd7 53. Kg1 Kc7 54. Kg2 Bd7 55. Ndf1 Nb5 56. Nd2 Na3 57. Kg1 Rb8 58. Be2 Nb5 59. Bc4 Nd4 60. Bd3 Bb5 61. Bc4 Kb7 62. Kg2 Ka7 63. Kg1 Be8 64. Bd3 Kb7 65. Kg2 Kc7 66. Kg1 Nb5 67. Kg2 Na3 68. Kf2 Bb5 69. Bc4 Bd7 70. Bd3 Rb5 71. Nec4 Rb8 72. Ne3 Rb5 1/2-1/2

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.16"]
[Round "2"]
[White "Van De Mheen, Steven"]
[Black "Niemeijer, Leon"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1473"]
[BlackElo "1841"]
[PlyCount "110"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nc6 5. Bf4 Bd6 6. Bxd6 Qxd6 7. c3 Bg4 8. Be2 Nge7 9. h3 Bf5 10. Bd3 Bxd3 11. Qxd3 Qe6+ 12. Qe2 Qxe2+ 13. Kxe2 0-0-0 14. Re1 f6 15. Nbd2 Rhe8 16. Kd3 Nf5 17. g4 Nd6 18. Rxe8 Rxe8 19. Re1 Ne7 20. b3 Kd7 21. c4 dxc4+ 22. bxc4 c6 23. Rb1 Ng6 24. c5 Nf4+ 25. Kc2 Nb5 26. Rb3 Nxh3 27. a4 Nc7 28. Rxb7 Kc8 29. Rb1 Nxf2 30. g5 Ne4 31. gxf6 Nxd2 32. Kxd2 gxf6 33. Rh1 Re7 34. Nh4 Ne8 35. Nf5 Rf7 36. Re1 Kd7 37. Kd3 h5 38. Rh1 Rh7 39. Ke4 Nc7 40. Ne3 Ke6 41. Ng2 f5+ 42. Kf3 Nd5 43. a5 Kf6 44. Ke2 Kg5 45. Kf3 h4 46. Rg1 Kf6 47. Nf4 Nxf4 48. Kxf4 h3 49. Rh1 h2 50. a6 Ke6 51. Kg5 Kd5 52. Kxf5 Kxd4 53. Kg4 Kxc5 54. Kg3 Kb6 55. Kg2 c5 0-1

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.15"]
[Round "1"]
[White "Niemeijer, Leon"]
[Black "Duchene, Rene"]
[Result "0-1"]
[ECO "D34"]
[WhiteElo "1841"]
[BlackElo "2170"]
[PlyCount "76"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c5 4. cxd5 exd5 5. g3 Nc6 6. Bg2 Nf6 7. Nc3 Be7 8. 0-0 0-0 9. dxc5 Bxc5 10. Bg5 d4 11. Bxf6 Qxf6 12. Ne4 Qe7 13. Nxc5 Qxc5 14. Rc1 Qb6 15. Qd2 Bf5 16. b3 Rfe8 17. Qf4 Bg6 18. Rfe1 Re4 19. Qd2 Re7 20. Rc4 Rd8 21. Rd1 d3 22. e3 Be4 23. Ne1 Bxg2 24. Kxg2 Ne5 25. Rc3 Qg6 26. Qc1 h5 27. Nxd3 Qe4+ 28. Kf1 Qh1+ 29. Ke2 Qf3+ 30. Ke1 Red7 31. Qc2 Qh1+ 32. Ke2 Qxh2 33. Rc8 Ng4 34. Rxd8+ Rxd8 35. Rf1 Re8 36. Kf3 Nxe3 37. Qe2 Qg2+ 38. Kf4 Nd5+ 0-1

[Event "Groninger Combinatie op"]
[Site "Groningen"]
[Date "2022.05.28"]
[Round "5"]
[White "Niemeijer, Leon"]
[Black "Nicolai, Amir"]
[Result "1/2-1/2"]
[ECO "D47"]
[WhiteElo "1693"]
[BlackElo "2160"]
[PlyCount "68"]
[EventDate "2022.05.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 Bd6 9. 0-0 0-0 10. b3 Bb7 11. Bb2 a6 12. Ne4 Nxe4 13. Bxe4 f5 14. Bc2 c5 15. dxc5 Nxc5 16. Qe2 Qe7 17. b4 Ne4 18. a3 e5 19. Bb3+ Kh8 20. Rfd1 Rac8 21. Bd5 Bxd5 22. Rxd5 Nf6 23. Rd2 e4 24. Nd4 Bxh2+ 25. Kxh2 Ng4+ 26. Kg1 Qh4 27. Qe1 f4 28. exf4 Rxf4 29. Ne6 Qh2+ 30. Kf1 Qh1+ 31. Ke2 Qxg2 32. Nxf4 Qf3+ 33. Kf1 Qh1+ 34. Ke2 Qf3+ 1/2-1/2

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2022.05.07"]
[Round "7"]
[White "Wage, Sander"]
[Black "Niemeijer, Leon"]
[Result "1/2-1/2"]
[ECO "C01"]
[WhiteElo "1859"]
[BlackElo "1693"]
[PlyCount "57"]
[EventDate "2022.05.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Bd3 dxe4 4. Bxe4 Nf6 5. Bf3 c5 6. Ne2 cxd4 7. Nxd4 Bc5 8. Be3 e5 9. Nb3 Qxd1+ 10. Bxd1 Bxe3 11. fxe3 Nc6 12. Nc3 e4 13. 0-0 0-0 14. Nc5 Re8 15. Rf4 Nb4 16. N5xe4 Nxe4 17. Rxe4 Rxe4 18. Nxe4 Bf5 19. Nd6 Bxc2 20. Bxc2 Nxc2 21. Rc1 Nxe3 22. Nxb7 f6 23. b3 Rb8 24. Kf2 Ng4+ 25. Kg3 Rxb7 26. Kxg4 Kf7 27. Rc6 g6 28. Kf3 h5 29. Ra6 1/2-1/2

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2022.05.06"]
[Round "6"]
[White "Niemeijer, Leon"]
[Black "Bakija, Alan"]
[Result "1/2-1/2"]
[ECO "D15"]
[WhiteElo "1693"]
[BlackElo "1868"]
[PlyCount "68"]
[EventDate "2022.05.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 a6 5. Nc3 Bf5 6. a3 e6 7. Nh4 Be4 8. Nxe4 Nxe4 9. Nf3 Qa5+ 10. Bd2 Nxd2 11. Qxd2 Qxd2+ 12. Kxd2 Nd7 13. c5 e5 14. Nxe5 Nxe5 15. dxe5 Bxc5 16. b4 Be7 17. Bd3 f6 18. e6 Bd6 19. f4 Ke7 20. f5 a5 21. b5 c5 22. a4 Rad8 23. Rad1 Be5 24. Kc2 b6 25. e4 dxe4 26. Bxe4 Rxd1 27. Rxd1 Rd8 28. Rxd8 Kxd8 29. h3 Ke7 30. Kd3 Bc7 31. Bd5 Bd8 32. Ke4 Kd6 33. Bc4 Be7 34. g3 Bd8 1/2-1/2

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2022.05.05"]
[Round "5"]
[White "Groen, Jari"]
[Black "Niemeijer, Leon"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "1750"]
[BlackElo "1693"]
[PlyCount "45"]
[EventDate "2022.05.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 cxd4 8. Nxd4 Qb6 9. a3 Bc5 10. Ncb5 0-0 11. b4 Bxd4 12. Nxd4 Nxd4 13. Bxd4 Qc7 14. Bd3 f5 15. exf6 Nxf6 16. 0-0 Ne4 17. Qh5 Bd7 18. Rae1 Rxf4 19. Rxf4 Qxf4 20. Bxe4 dxe4 21. Rf1 g6 22. Qc5 Qh4 23. Qe5 1-0

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2022.05.04"]
[Round "4"]
[White "Achuthan, Dylan"]
[Black "Niemeijer, Leon"]
[Result "1-0"]
[ECO "C00"]
[WhiteElo "1995"]
[BlackElo "1693"]
[PlyCount "133"]
[EventDate "2022.05.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e6 2. b3 d5 3. Bb2 dxe4 4. Nc3 Nf6 5. Qe2 b6 6. Nxe4 Bb7 7. Nxf6+ gxf6 8. 0-0-0 Rg8 9. f4 Nd7 10. Nf3 Qe7 11. g3 0-0-0 12. Bg2 e5 13. fxe5 fxe5 14. Nxe5 Nxe5 15. Bxb7+ Kxb7 16. Qxe5 Qxe5 17. Bxe5 Bh6 18. Rhf1 Rd5 19. Bf4 Bg7 20. Rde1 Rd7 21. Re4 f6 22. Re6 Rf8 23. Be3 c5 24. Rf5 Rff7 25. Rh5 Bf8 26. Bf4 Rde7 27. Rxe7+ Rxe7 28. Kd1 Kc6 29. Bh6 Bxh6 30. Rxh6 Rf7 31. Ke2 Kd5 32. Kf3 Ke5 33. g4 Rg7 34. h3 Rf7 35. Rh5+ Ke6 36. c3 Rd7 37. Ke3 Re7 38. d4 cxd4+ 39. Kxd4 Rd7+ 40. Kc4 a6 41. Kb4 Rg7 42. c4 Kd6 43. Kc3 Ke6 44. b4 Kd6 45. a4 Re7 46. a5 Kc7 47. axb6+ Kxb6 48. Rh6 Kc7 49. Rxf6 Re3+ 50. Kd4 Rxh3 51. Rxa6 Rh4 52. Kc5 Kb7 53. Rd6 Rxg4 54. Rd7+ Kc8 55. Rxh7 Rg6 56. Kb5 Rg5+ 57. c5 Rg6 58. c6 Rg4 59. Kc5 Kd8 60. b5 Rg5+ 61. Kb6 Rg6 62. Rh8+ Ke7 63. Kb7 Rg7 64. c7 Kd6 65. Rh6+ Kc5 66. Kb8 Kxb5 67. c8Q 1-0

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2022.05.03"]
[Round "3"]
[White "Niemeijer, Leon"]
[Black "De Rooij, Kevin"]
[Result "1-0"]
[ECO "D12"]
[WhiteElo "1693"]
[BlackElo "1584"]
[PlyCount "65"]
[EventDate "2022.05.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. Nc3 e6 6. Nh4 Bg6 7. Nxg6 hxg6 8. Qb3 Qc7 9. cxd5 exd5 10. Bd2 Bd6 11. Rc1 Nbd7 12. Nb5 Qb8 13. Nxd6+ Qxd6 14. Qxb7 0-0 15. Rxc6 Qe7 16. Qb3 Ne4 17. Bb4 Qh4 18. Qc2 Rfe8 19. Bd3 Nxf2 20. Qxf2 Qxd4 21. 0-0 Qxd3 22. Qxf7+ Kh8 23. Qxd7 Qxe3+ 24. Kh1 a5 25. Bc3 Re7 26. Qh3+ Qxh3 27. gxh3 Re2 28. Rd6 Rae8 29. Rxd5 Rc2 30. Rd2 Re2 31. Rxe2 Rxe2 32. Rf7 Rc2 33. Rc7 1-0

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2022.05.02"]
[Round "2"]
[White "Alvares, Thomas"]
[Black "Niemeijer, Leon"]
[Result "0-1"]
[ECO "C11"]
[WhiteElo "1789"]
[BlackElo "1693"]
[PlyCount "72"]
[EventDate "2022.05.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 cxd4 8. Nxd4 Qb6 9. Na4 Qa5+ 10. c3 Nxd4 11. b4 Bxb4 12. Bxd4 Be7 13. Rb1 a6 14. Bd3 b5 15. Nb2 Bc5 16. Ke2 Qxa2 17. Qc2 Qa5 18. f5 exf5 19. Bxf5 Bxd4 20. cxd4 Qb6 21. e6 fxe6 22. Bxh7 Qxd4 23. Bg6+ Ke7 24. h3 Bb7 25. Rhf1 Rhf8 26. Nd3 Rac8 27. Qd2 Rxf1 28. Rxf1 Nf6 29. Rf4 Qc3 30. Qe3 Qc2+ 31. Kf1 Qb1+ 32. Kf2 Rc2+ 33. Kg3 d4 34. Qxd4 Rxg2+ 35. Kh4 Rxg6 36. Qc5+ Ke8 0-1

[Event "NED-ch U16"]
[Site "Almelo"]
[Date "2022.05.01"]
[Round "1"]
[White "Niemeijer, Leon"]
[Black "Van der Hagen, Loek"]
[Result "1/2-1/2"]
[ECO "A58"]
[WhiteElo "1693"]
[BlackElo "2071"]
[PlyCount "70"]
[EventDate "2022.05.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 e6 6. dxe6 fxe6 7. e3 d5 8. Nf3 Bd6 9. Bb5+ Nbd7 10. Nc3 0-0 11. 0-0 Qb6 12. a4 Bxa6 13. Bxa6 Rxa6 14. Nb5 Ne5 15. Nxe5 Bxe5 16. f4 Bb8 17. b3 e5 18. Bb2 c4 19. fxe5 Bxe5 20. Bd4 Qb8 21. h3 Re8 22. Bxe5 Qxe5 23. Re1 Ne4 24. bxc4 dxc4 25. Qd4 Qg3 26. Qxc4+ Kh8 27. Qf7 Rd8 28. Qf3 Qxf3 29. gxf3 Rg6+ 30. Kf1 Ng3+ 31. Kg1 Rd2 32. Nd4 Nh5+ 33. Kf1 Ng3+ 34. Kg1 Nh5+ 35. Kf1 Ng3+ 1/2-1/2

