[Event "COL-ch U12"]
[Site "Choconta"]
[Date "2023.03.20"]
[Round "7"]
[White "Rodriguez Velasquez, William Nicolas"]
[Black "Van der Mass, Martien"]
[Result "1-0"]
[ECO "D37"]
[WhiteElo "1556"]
[BlackElo "1205"]
[PlyCount "65"]
[EventDate "2023.03.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 213 Extra"]
[Source "ChessBase"]
[SourceDate "2023.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.05.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Bf4 e6 5. e3 Be7 6. Nf3 0-0 7. h3 Nbd7 8. cxd5 cxd5 9. Bd3 Bb4 10. 0-0 Bxc3 11. bxc3 Ne4 12. Bxe4 dxe4 13. Nd2 f5 14. Qb3 Nf6 15. Nc4 Nd5 16. Bg3 a6 17. Ne5 b5 18. a4 bxa4 19. Rxa4 Qe8 20. c4 Nc3 21. Ra5 Ne2+ 22. Kh2 f4 23. Bxf4 Nxf4 24. exf4 Rxf4 25. Qe3 Qf8 26. Kg3 g5 27. Ng4 h6 28. Re5 Qb4 29. Nxh6+ Kh7 30. Rxg5 Rf6 31. Qxe4+ Rf5 32. Nxf5 Qb8+ 33. Nd6+ 1-0

[Event "COL-ch U12"]
[Site "Choconta"]
[Date "2023.03.20"]
[Round "6"]
[White "Van der Mass, Martien"]
[Black "Guevara Garcia, Miguel Angel"]
[Result "1-0"]
[ECO "C00"]
[WhiteElo "1205"]
[PlyCount "47"]
[EventDate "2023.03.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 213 Extra"]
[Source "ChessBase"]
[SourceDate "2023.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.05.31"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. e5 c5 4. b4 Qb6 5. bxc5 Bxc5 6. d4 Be7 7. Bd3 Nc6 8. c3 Bd7 9. Qc2 h6 10. 0-0 f5 11. Be3 0-0-0 12. a3 Rf8 13. c4 f4 14. Bd2 g5 15. cxd5 exd5 16. e6 Bxe6 17. Ne5 Bf7 18. Bg6 Be6 19. Rc1 Kc7 20. Nxc6 bxc6 21. Qa4 Kb7 22. Bd3 Rc8 23. Ba5 Qb2 24. Nd2 1-0

[Event "COL-ch U12"]
[Site "Choconta"]
[Date "2023.03.19"]
[Round "5"]
[White "Diaz De la Cruz, Alvaro Santiago"]
[Black "Van der Mass, Martien"]
[Result "1/2-1/2"]
[ECO "C50"]
[WhiteElo "1247"]
[BlackElo "1205"]
[PlyCount "89"]
[EventDate "2023.03.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 213 Extra"]
[Source "ChessBase"]
[SourceDate "2023.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.05.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Nc3 Nf6 5. d3 d6 6. h3 h6 7. Be3 Bxe3 8. fxe3 0-0 9. 0-0 Re8 10. Re1 Na5 11. Bb3 Nxb3 12. axb3 Qe7 13. d4 Be6 14. dxe5 dxe5 15. Qe2 a6 16. Rad1 Rad8 17. Rxd8 Rxd8 18. Rd1 Rxd1+ 19. Qxd1 Qc5 20. Qd3 g5 21. Qd8+ Kg7 22. Qd2 g4 23. hxg4 Nxg4 24. Na4 Qxe3+ 25. Qxe3 Nxe3 26. c4 b5 27. Nc5 bxc4 28. Nxa6 Kf6 29. Nxc7 cxb3 30. Nxe6 Kxe6 31. Nd2 Nd1 32. Nxb3 Nxb2 33. Nc5+ Ke7 34. Kf2 Nc4 35. Kf3 Kf6 36. Nd7+ Kg5 37. Nc5 h5 38. g3 h4 39. gxh4+ Kxh4 40. Nd3 Kg5 41. Nc5 f5 42. exf5 Kxf5 43. Ke2 Nd6 44. Ke3 Nc4+ 45. Ke2 1/2-1/2

[Event "COL-ch U12"]
[Site "Choconta"]
[Date "2023.03.19"]
[Round "4"]
[White "Van der Mass, Martien"]
[Black "Gonzalez Gonzalez, Guillermo David"]
[Result "1-0"]
[ECO "B76"]
[WhiteElo "1205"]
[BlackElo "1423"]
[PlyCount "99"]
[EventDate "2023.03.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 213 Extra"]
[Source "ChessBase"]
[SourceDate "2023.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.05.31"]
[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 Bd7 10. g4 h5 11. g5 Nh7 12. f4 Nxd4 13. Bxd4 Bxd4 14. Qxd4 Qb6 15. Nd5 Qd8 16. Ne3 Qb6 17. Qxb6 axb6 18. a3 Bc6 19. Nd5 Bxd5 20. Rxd5 Ra4 21. Bd3 Ra5 22. Rd4 f6 23. h4 Rc5 24. Rb4 Rc6 25. Bc4+ Kg7 26. Bd5 Rc7 27. Rxb6 fxg5 28. fxg5 Rf2 29. c3 Nf8 30. Rxb7 Rxb7 31. Bxb7 Rf4 32. Kd2 Nd7 33. b4 Rf2+ 34. Ke3 Ra2 35. a4 Rxa4 36. Bc6 Ra7 37. Bxd7 Rxd7 38. Kd4 e6 39. Rf1 Rc7 40. c4 Rb7 41. b5 d5 42. exd5 exd5 43. Kxd5 Kh8 44. Kc6 Rh7 45. b6 Rh6 46. b7 Kg7 47. gxh6+ Kxh6 48. b8Q Kg7 49. Qf8+ Kh7 50. Rf7# 1-0

[Event "COL-ch U12"]
[Site "Choconta"]
[Date "2023.03.18"]
[Round "3"]
[White "Cano Alcaraz, Juan Jose"]
[Black "Van der Mass, Martien"]
[Result "1-0"]
[ECO "A17"]
[WhiteElo "1489"]
[BlackElo "1205"]
[PlyCount "61"]
[EventDate "2023.03.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 213 Extra"]
[Source "ChessBase"]
[SourceDate "2023.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.05.31"]
[SourceQuality "1"]

1. Nf3 d5 2. e3 Nf6 3. c4 e6 4. Nc3 c5 5. cxd5 exd5 6. d4 Be6 7. Bb5+ Nbd7 8. b3 cxd4 9. Qxd4 a6 10. Bxd7+ Qxd7 11. Bb2 Rc8 12. 0-0 Bc5 13. Qa4 0-0 14. Qxd7 Nxd7 15. Rfd1 Nf6 16. h3 Rfd8 17. Nd4 h6 18. Rac1 b5 19. Kf1 g5 20. Nxe6 fxe6 21. Nxb5 Ne4 22. Nd4 Kf7 23. Ke2 Bb4 24. Nc6 Bd6 25. Nxd8+ Rxd8 26. Rc6 a5 27. f3 Ng3+ 28. Kf2 Ke7 29. Rxd6 Kxd6 30. Kxg3 e5 31. Kg4 1-0

[Event "COL-ch U12"]
[Site "Choconta"]
[Date "2023.03.18"]
[Round "2"]
[White "Van der Mass, Martien"]
[Black "Garzon Camelo, Andres Santiago"]
[Result "1/2-1/2"]
[ECO "D02"]
[WhiteElo "1205"]
[BlackElo "1928"]
[PlyCount "99"]
[EventDate "2023.03.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 213 Extra"]
[Source "ChessBase"]
[SourceDate "2023.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.05.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. Bf4 0-0 6. e3 b6 7. Bd3 Bb7 8. 0-0 Nbd7 9. Rc1 a6 10. a4 c5 11. Ne5 dxc4 12. Bxc4 Nxe5 13. dxe5 Nd5 14. Qc2 Nxf4 15. exf4 Qc7 16. f5 Qxe5 17. fxe6 fxe6 18. Rce1 Qg5 19. Bxe6+ Kh8 20. Bd5 Bxd5 21. Nxd5 Qxd5 22. Rxe7 Qg5 23. Rfe1 Rad8 24. R7e2 Qf6 25. Qc4 a5 26. Qe6 Rd4 27. Qxf6 gxf6 28. Re4 Rfd8 29. f3 Rxe4 30. Rxe4 Rd2 31. Re6 Rxb2 32. Rxf6 Kg7 33. Rc6 Kf7 34. h4 Ke7 35. h5 Kf7 36. g4 Rb4 37. g5 Rxa4 38. Rxb6 Rh4 39. Rb5 Rxh5 40. Rxc5 a4 41. Ra5 Rh4 42. Kg2 Ke6 43. Kg3 Rb4 44. f4 Rd4 45. f5+ Kd6 46. g6 h5 47. f6 Rg4+ 48. Kh3 Rxg6 49. f7 Ke7 50. Rxa4 1/2-1/2

[Event "COL-ch U10"]
[Site "Bogota"]
[Date "2021.03.28"]
[Round "7"]
[White "Diaz, Thomas"]
[Black "Van der Mass, Martien"]
[Result "0-1"]
[ECO "C50"]
[BlackElo "1314"]
[PlyCount "40"]
[EventDate "2021.03.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. 0-0 Nf6 5. d3 0-0 6. Nxe5 Nxe5 7. Bg5 h6 8. Bxf6 Qxf6 9. Qh5 d6 10. Nc3 Bg4 11. Nd5 Qd8 12. Qxg4 Nxg4 13. d4 Bxd4 14. c3 Bb6 15. Rad1 Qh4 16. h3 Nxf2 17. Nxb6 Nxd1 18. Nxa8 Ne3 19. g3 Qxg3+ 20. Kh1 Qg2# 0-1

[Event "COL-ch U10"]
[Site "Bogota"]
[Date "2021.03.27"]
[Round "5"]
[White "Garzon Camelo, Andres Santiago"]
[Black "Van der Mass, Martien"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1371"]
[BlackElo "1314"]
[PlyCount "55"]
[EventDate "2021.03.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Bc5 4. Bc4 Nf6 5. d3 h6 6. h3 0-0 7. 0-0 d6 8. Be3 Bxe3 9. fxe3 Be6 10. Nd5 Na5 11. Nxf6+ Qxf6 12. Bxe6 fxe6 13. Qd2 Nc6 14. Qc3 d5 15. Qb3 dxe4 16. Qxb7 exf3 17. Rxf3 Nd8 18. Qxa8 Qe7 19. Rxf8+ Qxf8 20. Rf1 Qd6 21. Qxa7 Nc6 22. Qa8+ Nd8 23. a4 Kh7 24. a5 Nc6 25. Rf8 Qc5 26. Qe8 Qxe3+ 27. Kh2 Qf4+ 28. Rxf4 1-0

[Event "COL-ch U10"]
[Site "Bogota"]
[Date "2021.03.27"]
[Round "6"]
[White "Van der Mass, Martien"]
[Black "Gonzalez Bolivar, Juan Jose"]
[Result "0-1"]
[ECO "C55"]
[WhiteElo "1314"]
[BlackElo "1375"]
[PlyCount "44"]
[EventDate "2021.03.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Nxe4 5. Nxe4 d5 6. Bb5 dxe4 7. Nxe5 Qd5 8. Nxc6 Qxb5 9. Nd4 Qc4 10. c3 Bc5 11. b3 Qd5 12. 0-0 Bxd4 13. cxd4 Qxd4 14. Re1 Qxa1 15. Rxe4+ Be6 16. Re1 0-0-0 17. Qc2 Rhe8 18. Rf1 g6 19. Bb2 Bf5 20. Qc3 Qxa2 21. Ra1 Qxa1+ 22. Bxa1 Re1# 0-1

[Event "COL-ch U10"]
[Site "Bogota"]
[Date "2021.03.26"]
[Round "4"]
[White "Payares Diaz, Alejandro"]
[Black "Van der Mass, Martien"]
[Result "0-1"]
[ECO "C54"]
[WhiteElo "1279"]
[BlackElo "1314"]
[PlyCount "62"]
[EventDate "2021.03.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 0-0 8. Bg5 h6 9. Bh4 g5 10. Nxg5 hxg5 11. Bxg5 Qe7 12. e5 Nxe5 13. dxe5 Qxe5+ 14. Be3 Bxc3+ 15. bxc3 Qxc3+ 16. Ke2 Qxc4+ 17. Ke1 d5 18. Qf3 Qc3+ 19. Ke2 Bg4 20. Rhg1 Bxf3+ 21. gxf3+ Kh7 22. Rg3 Qxa1 23. Rh3+ Kg6 24. Rg3+ Kf5 25. Rg5+ Ke6 26. f4 Qxa2+ 27. Kf3 Ne4 28. Re5+ Kd6 29. Kg4 Nxf2+ 30. Kf5 Qc2+ 31. Kf6 Qg6# 0-1

[Event "COL-ch U10"]
[Site "Bogota"]
[Date "2021.03.25"]
[Round "2"]
[White "Barreto Pulido, Mariana"]
[Black "Van der Mass, Martien"]
[Result "0-1"]
[ECO "C53"]
[WhiteElo "1154"]
[BlackElo "1314"]
[PlyCount "89"]
[EventDate "2021.03.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d4 exd4 5. c3 Qe7 6. 0-0 Nf6 7. Bg5 0-0 8. Bxf6 Qxf6 9. Re1 dxc3 10. Nxc3 d6 11. Qd3 Ne5 12. Qe2 Bg4 13. Nd5 Nxf3+ 14. gxf3 Qxf3 15. Qxf3 Bxf3 16. Nxc7 Rac8 17. Nd5 Rfe8 18. Bd3 f5 19. Nc3 fxe4 20. Bxe4 Bxe4 21. Rxe4 Rxe4 22. Nxe4 d5 23. Nxc5 Rxc5 24. Kg2 Kf7 25. Kf3 Ke6 26. Ke3 Ke5 27. Kd3 Rc4 28. Re1+ Re4 29. Rc1 Rd4+ 30. Ke3 Rc4 31. Rxc4 dxc4 32. f3 g5 33. a3 b5 34. h3 a5 35. Kd2 Kd4 36. Kc2 Ke3 37. Kc3 Kxf3 38. a4 b4+ 39. Kxc4 Kg3 40. Kb5 Kxh3 41. Kxa5 g4 42. Kxb4 g3 43. a5 g2 44. a6 g1Q 45. Kb3 0-1

[Event "COL-ch U10"]
[Site "Bogota"]
[Date "2021.03.25"]
[Round "3"]
[White "Van der Mass, Martien"]
[Black "Tascon, Diego Alejandro"]
[Result "0-1"]
[ECO "C50"]
[WhiteElo "1314"]
[BlackElo "1048"]
[PlyCount "118"]
[EventDate "2021.03.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. 0-0 d6 6. h3 Be6 7. Bxe6 fxe6 8. c3 Bb6 9. Nbd2 Qd7 10. a4 a5 11. Nc4 Ba7 12. Be3 h6 13. Qb3 0-0 14. Qxb7 Rfb8 15. Qa6 Bxe3 16. Nb6 Rxa6 17. Nxd7 Nxd7 18. fxe3 Rxb2 19. Rfb1 Rab6 20. Rxb2 Rxb2 21. d4 Re2 22. d5 exd5 23. exd5 Ne7 24. Re1 Rxe1+ 25. Nxe1 Nxd5 26. Kf2 Nxc3 27. Nd3 Nc5 28. Nxc5 dxc5 29. Ke1 Kf7 30. Kd2 Nxa4 31. Kd3 Ke6 32. Kc4 Kd6 33. Kb5 Nc3+ 34. Kxa5 Nd5 35. e4 c4 36. Ka4 Nc3+ 37. Kb4 Nxe4 38. Kxc4 c5 39. Kd3 Kd5 40. h4 c4+ 41. Ke3 Nc5 42. Kd2 Kd4 43. g4 c3+ 44. Kc2 e4 45. h5 Kc4 46. Kd1 Kd3 47. Kc1 c2 48. g5 e3 49. gxh6 gxh6 50. Kb2 Kd2 51. Ka3 c1Q+ 52. Kb4 Qc3+ 53. Kb5 Kd3 54. Kb6 Nb3 55. Kb5 Qc4+ 56. Kb6 Qc5+ 57. Ka6 Qb4 58. Ka7 Nc5 59. Ka8 Qb7# 0-1

[Event "COL-ch U10"]
[Site "Bogota"]
[Date "2021.03.24"]
[Round "1"]
[White "Van der Mass, Martien"]
[Black "Remicio Gomez, Joshua Santiago"]
[Result "1-0"]
[ECO "B80"]
[WhiteElo "1314"]
[BlackElo "1257"]
[PlyCount "87"]
[EventDate "2021.03.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. Qd2 Be7 8. 0-0-0 Nbd7 9. f3 Qc7 10. Be2 b5 11. f4 Bb7 12. Bf3 b4 13. Na4 Nxe4 14. Qxb4 e5 15. Nb3 d5 16. Qa5 Rc8 17. Qxc7 Rxc7 18. fxe5 Nxe5 19. Bf4 Bd6 20. Bxe4 dxe4 21. Rxd6 Nd3+ 22. Rxd3 exd3 23. Bxc7 Kd7 24. Be5 Rc8 25. Nb6+ Ke6 26. Nxc8 Bxc8 27. Bxg7 dxc2 28. Kxc2 Bb7 29. Nc5+ Kf5 30. Nxb7 Kg6 31. Bd4 f5 32. Kd3 Kg5 33. h4+ Kg4 34. Bf2 h5 35. a4 Kf4 36. a5 Kg4 37. Nc5 Kf4 38. Nxa6 Kg4 39. Nc7 Kf4 40. a6 Kg4 41. a7 Kf4 42. a8Q Ke5 43. Qd5+ Kf4 44. Ne6+ 1-0

