[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.05.04"]
[Round "9"]
[White "Van Randtwijk, Mick"]
[Black "Koster, Tobias"]
[Result "1-0"]
[ECO "B78"]
[WhiteElo "1669"]
[PlyCount "93"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 0-0 8. Bb3 d6 9. f3 Bd7 10. Qd2 a6 11. 0-0-0 b5 12. Kb1 b4 13. Nce2 a5 14. Nc1 Qb8 15. g4 Ne5 16. Bh6 a4 17. Bxg7 Kxg7 18. Bd5 Nxd5 19. exd5 Nc4 20. Qe2 Na3+ 21. Ka1 Re8 22. bxa3 bxa3 23. Nd3 Bb5 24. Rb1 Bxd3 25. Qxd3 Qa7 26. Nc6 Qc5 27. Qd4+ Qxd4+ 28. Nxd4 Rab8 29. Nc6 Rbc8 30. Rb4 Ra8 31. Re4 e5 32. Re3 Ra6 33. Rb1 Rc8 34. Rxa3 Kf6 35. h4 h6 36. Rb4 Rca8 37. Rb7 Rf8 38. Rd7 Kg7 39. Rxd6 Re8 40. Rd7 e4 41. Re7 Rxe7 42. Nxe7 exf3 43. Rxf3 Rd6 44. c4 Kf8 45. c5 Ra6 46. d6 Ke8 47. c6 1-0

[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.05.03"]
[Round "8"]
[White "Koster, Tobias"]
[Black "Reichardt, Robin"]
[Result "1/2-1/2"]
[ECO "C01"]
[PlyCount "55"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Bd3 Nf6 5. c3 c6 6. Nf3 Bg4 7. Bg5 Nbd7 8. Nbd2 Be7 9. 0-0 0-0 10. Qc2 h6 11. Bh4 Re8 12. h3 Bxf3 13. Nxf3 Ne4 14. Bxe7 Qxe7 15. Rfe1 f5 16. Nd2 Qf6 17. Nxe4 fxe4 18. Be2 Qg5 19. Qc1 e3 20. fxe3 Qxe3+ 21. Qxe3 Rxe3 22. Bg4 Rxe1+ 23. Rxe1 Nf6 24. Bf3 Kf7 25. Kf2 Re8 26. Rxe8 Kxe8 27. Ke3 g5 28. g4 1/2-1/2

[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.05.01"]
[Round "6"]
[White "Van der Velden, Alain"]
[Black "Koster, Tobias"]
[Result "1/2-1/2"]
[ECO "D02"]
[PlyCount "104"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 Bf5 5. Bf4 e6 6. e3 Bb4 7. Nd2 Nbd7 8. a3 Ba5 9. b4 Bc7 10. Bxc7 Qxc7 11. Nf3 Ne4 12. Nxe4 Bxe4 13. Nh4 Nf6 14. f3 Bg6 15. Nxg6 fxg6 16. Rc1 Qd7 17. Bd3 a6 18. 0-0 Rc8 19. Qe1 0-0 20. Qg3 Qc7 21. Qxc7 Rxc7 22. Rc2 Rfc8 23. Rfc1 Ne8 24. Re2 Kf8 25. e4 Nf6 26. exd5 exd5 27. c5 Re8 28. Rce1 Rce7 29. Rxe7 Rxe7 30. Rxe7 Kxe7 31. Kf2 Kd8 32. Ke3 Ne8 33. Kf4 Ke7 34. Ke5 Nc7 35. g3 Ne6 36. h4 Nd8 37. Bf1 Nf7+ 38. Kf4 Nd8 39. Bh3 Kf6 40. Bc8 Ne6+ 41. Bxe6 Kxe6 42. Kg5 Kf7 43. Kf4 Kf6 44. g4 h6 45. g5+ Ke6 46. a4 h5 47. a5 Kd7 48. Ke5 Ke7 49. f4 Kd7 50. f5 Ke7 51. fxg6 Kd7 52. Kf5 Ke7 1/2-1/2

[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.04.30"]
[Round "5"]
[White "Koster, Tobias"]
[Black "Post, Jesper"]
[Result "1/2-1/2"]
[ECO "C45"]
[PlyCount "66"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Be2 0-0 8. Bf3 Bb6 9. 0-0 d6 10. Nxc6 Nxc6 11. Bxb6 axb6 12. Re1 Be6 13. b3 Ne5 14. Nd2 Nxf3+ 15. Nxf3 Rfc8 16. c4 Bg4 17. Qe2 Bxf3 18. gxf3 Re8 19. Kh1 Re5 20. Rg1 Rg5 21. Rxg5 Qxa1+ 22. Rg1 Qxa2 23. Qxa2 Rxa2 24. Kg2 Rb2 25. Ra1 Kf8 26. Ra7 Ke7 27. Rxb7 Kd7 28. Rb8 Rxb3 29. Rg8 g6 30. Rg7 Ke6 31. Rxh7 Rc3 32. h4 Rxc4 33. Rh6 Kf6 1/2-1/2

[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.04.29"]
[Round "4"]
[White "Bourgonjen, Ruben"]
[Black "Koster, Tobias"]
[Result "1-0"]
[ECO "E60"]
[PlyCount "77"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 d6 5. Bg2 0-0 6. 0-0 c5 7. d5 Re8 8. Nc3 e6 9. e4 a6 10. Re1 e5 11. Qc2 Rf8 12. Nh4 Nbd7 13. f4 Rb8 14. f5 Kh8 15. Bd2 Kg8 16. Qc1 Qe8 17. h3 Kh8 18. g4 Ng8 19. Rf1 Bf6 20. g5 Be7 21. f6 Bd8 22. Nf3 Bc7 23. h4 Bd8 24. Qd1 Bc7 25. Nh2 Nb6 26. b3 Bd8 27. h5 Bd7 28. hxg6 fxg6 29. Qf3 Rf7 30. Qf2 Bc8 31. Qh4 Qd7 32. Rf3 Na8 33. Bh3 Qc7 34. Be6 Rf8 35. f7 Bxe6 36. dxe6 Kg7 37. Rh3 Rxf7 38. Qxh7+ Kf8 39. exf7 1-0

[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.04.28"]
[Round "3"]
[White "Koster, Tobias"]
[Black "Van Roon, Sjoerd"]
[Result "0-1"]
[ECO "B01"]
[PlyCount "46"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. Nf3 Nc6 5. d4 Bd7 6. Be3 0-0-0 7. Be2 Nf6 8. Ng5 Be8 9. Bb5 e5 10. Bxc6 bxc6 11. Bd2 exd4 12. Nce4 Qe5 13. f3 h6 14. f4 Qe7 15. Qe2 hxg5 16. Qa6+ Kd7 17. Rd1 Qxe4+ 18. Kf1 gxf4 19. Bc3 Bc5 20. Bxd4 Bxd4 21. c3 Nd5 22. Rxd4 Qb1+ 23. Kf2 Qxh1 0-1

[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.04.27"]
[Round "2"]
[White "Bekedam, Tyro"]
[Black "Koster, Tobias"]
[Result "1-0"]
[ECO "B72"]
[WhiteElo "1821"]
[PlyCount "51"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Be3 Bg7 6. Nc3 Nf6 7. Bc4 d6 8. 0-0 Bd7 9. h3 0-0 10. Kh1 a6 11. a4 Qc8 12. Be2 Rb8 13. Kh2 Qc7 14. f4 Bh6 15. g4 Nxd4 16. Qxd4 Bg7 17. Qd3 Bc8 18. Rf2 Qd7 19. f5 e5 20. g5 Ne8 21. Bg4 Qd8 22. Nd5 Nc7 23. Bb6 Qxg5 24. Bxc7 Ra8 25. Bxd6 Rd8 26. Be7 1-0

[Event "NED-ch U15"]
[Site "Rotterdam"]
[Date "2014.04.26"]
[Round "1"]
[White "Koster, Tobias"]
[Black "Elgersma, Simon"]
[Result "0-1"]
[ECO "C01"]
[BlackElo "1563"]
[PlyCount "58"]
[EventDate "2014.04.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nc3 c6 5. Nf3 Bd6 6. Be2 Ne7 7. h3 Bf5 8. 0-0 Nd7 9. a3 Qc7 10. Re1 0-0 11. Bd3 Bg6 12. Bg5 f6 13. Bxg6 Nxg6 14. Bc1 Rfe8 15. Be3 Ndf8 16. Qd2 Ne6 17. Ne2 Ne7 18. Nc1 Nf5 19. Nd3 Rad8 20. c3 b6 21. Rad1 Ne7 22. Re2 Ng6 23. Rde1 Qc8 24. Kh1 Re7 25. Kg1 Rde8 26. b4 Qa6 27. Ra1 f5 28. g3 f4 29. gxf4 Nexf4 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.19"]
[Round "9"]
[White "Koster, Tobias"]
[Black "De Haas, Lars"]
[Result "0-1"]
[ECO "C41"]
[PlyCount "98"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 d6 4. dxe5 dxe5 5. Qxd8+ Nxd8 6. Nxe5 f6 7. Nf3 f5 8. Nc3 fxe4 9. Nxe4 Bf5 10. Bd3 g6 11. Bf4 Ne6 12. Be5 Bg7 13. Bxg7 Nxg7 14. 0-0-0 0-0-0 15. Nfg5 Rd7 16. Nc5 Re7 17. Bxf5+ Nxf5 18. Rhe1 Rxe1 19. Rxe1 Nf6 20. h3 h6 21. Nf7 Rf8 22. Ne5 b6 23. Ne6 Re8 24. Kd1 Rxe6 25. Nxg6 Rd6+ 26. Kc1 Nh5 27. g4 Rxg6 28. gxf5 Rf6 29. Re3 Ng7 30. Re6 Nxe6 31. fxe6 Rxe6 32. Kd2 Kd7 33. c3 Ke7 34. Kd3 Kf6 35. b4 Kg5 36. a4 Kh4 37. Kd4 Kxh3 38. Kd5 Rd6+ 39. Ke4 Rf6 40. f4 Kg4 41. Kd5 h5 42. f5 Kxf5 43. c4 h4 44. c5 bxc5 45. bxc5 h3 46. a5 h2 47. c6 h1Q+ 48. Kc5 Rxc6+ 49. Kd4 Qe4# 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.19"]
[Round "7"]
[White "Koster, Tobias"]
[Black "Weidema, Luuk"]
[Result "0-1"]
[ECO "C45"]
[PlyCount "48"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Bg5 h6 6. Bh4 Be7 7. Nxc6 bxc6 8. Bxf6 Bxf6 9. Nc3 0-0 10. Bd3 d5 11. exd5 cxd5 12. 0-0 d4 13. Ne4 Be5 14. Qf3 Be6 15. Rfe1 Qd5 16. c4 dxc3 17. bxc3 Rad8 18. Red1 Rd7 19. Rab1 Rfd8 20. Rb5 Qxd3 21. Rxd3 Rxd3 22. Nd6 R8xd6 23. Rb8+ Kh7 24. Qe4+ f5 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.19"]
[Round "8"]
[White "Van Dongen, Sam"]
[Black "Koster, Tobias"]
[Result "0-1"]
[ECO "A35"]
[PlyCount "51"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 Nc6 3. e3 g6 4. d4 cxd4 5. exd4 Bg7 6. Nc3 Qb6 7. Be2 Nxd4 8. Be3 Nxf3+ 9. Bxf3 Qxb2 10. Nd5 Kd8 11. Rc1 Qxa2 12. 0-0 Nf6 13. Qe1 Nxd5 14. cxd5 Qb2 15. Bg5 Bf6 16. Bxf6 Qxf6 17. Qd2 a5 18. Rfe1 a4 19. Qe3 a3 20. h3 a2 21. d6 Qxd6 22. Bd5 Qf6 23. g4 a1Q 24. g5 Qxc1 25. gxf6 Qxe3 26. Rxe3 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.18"]
[Round "6"]
[White "Dubbeldam, Bart"]
[Black "Koster, Tobias"]
[Result "1-0"]
[ECO "B22"]
[PlyCount "105"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nc6 3. Nf3 g6 4. d4 cxd4 5. cxd4 Bg7 6. Be2 Qb6 7. e5 Nh6 8. Bxh6 Bxh6 9. b3 Qb4+ 10. Kf1 0-0 11. d5 Nd8 12. Qd4 Qxd4 13. Nxd4 Bg7 14. f4 d6 15. Nf3 dxe5 16. Nxe5 Bxe5 17. fxe5 Bf5 18. Bc4 Rc8 19. Nd2 b6 20. Kf2 Nb7 21. Rac1 Nc5 22. Rc3 b5 23. Bxb5 Ne4+ 24. Nxe4 Bxe4 25. Rxc8 Rxc8 26. Bc4 a5 27. Re1 Bf5 28. a4 Rb8 29. d6 exd6 30. exd6 Rd8 31. Re7 Be6 32. Bxe6 fxe6 33. Rxe6 Kf7 34. Re7+ Kf6 35. Rxh7 Rxd6 36. Ra7 Rd5 37. Ra6+ Kf5 38. g4+ Kg5 39. Ke3 Kxg4 40. Rxg6+ Kf5 41. Rb6 Ke5 42. Rb5 Rxb5 43. axb5 Kd6 44. h4 Kc5 45. b6 Kxb6 46. h5 Kb5 47. h6 Kb4 48. h7 Kxb3 49. h8Q a4 50. Kd3 a3 51. Qb8+ Ka2 52. Kc2 Ka1 53. Qb1# 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.18"]
[Round "5"]
[White "Koster, Tobias"]
[Black "Janssen, Aron"]
[Result "1-0"]
[ECO "C45"]
[PlyCount "105"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Bg5 h6 6. Nxc6 bxc6 7. Bh4 d5 8. exd5 cxd5 9. Qe2+ Be6 10. Nc3 Bb4 11. Qb5+ Qd7 12. Qxb4 Bg4 13. Bb5 c6 14. Bxf6 Qe6+ 15. Be2 Bxe2 16. Nxe2 Qxf6 17. 0-0 a5 18. Qd4 Qg5 19. Rfe1 0-0 20. Qf4 Qg6 21. Nd4 c5 22. Nf5 Qh5 23. Re5 Kh8 24. Nxg7 Qg6 25. Nf5 Ra6 26. Rxd5 Re8 27. Rxc5 Re2 28. Nh4 Qe6 29. h3 Re4 30. Qb8+ Kh7 31. Rc8 Qf6 32. Nf3 Qg7 33. Re1 Rb4 34. Qg3 Rg6 35. Qe5 Rxg2+ 36. Kh1 Rxf2 37. Qxg7+ Kxg7 38. Ne5 Rh4 39. Rg1+ Kh7 40. Rc3 Re4 41. Rcg3 h5 42. Rg7+ Kh8 43. Rg8+ Kh7 44. R8g7+ Kh8 45. Nxf7+ Rxf7 46. Rxf7 Re3 47. Rd1 Kg8 48. Ra7 Re8 49. Rxa5 Re2 50. Rg1+ Kf7 51. Rg2 Re1+ 52. Kh2 h4 53. c4 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.18"]
[Round "4"]
[White "Schelleman, Niels"]
[Black "Koster, Tobias"]
[Result "0-1"]
[ECO "B30"]
[PlyCount "156"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bc4 g6 4. Nc3 Bg7 5. d3 Bxc3+ 6. bxc3 Nf6 7. 0-0 Qa5 8. Qd2 0-0 9. Re1 d6 10. d4 cxd4 11. cxd4 Qxd2 12. Bxd2 Bg4 13. Bh6 Rfc8 14. Rad1 Bxf3 15. gxf3 a6 16. Kh1 b5 17. Bb3 Nb4 18. Rd2 a5 19. a3 Na6 20. e5 Nh5 21. e6 f6 22. f4 a4 23. Bd5 Rab8 24. Rg1 b4 25. axb4 Nxb4 26. Be4 f5 27. Bd3 Nxd3 28. cxd3 Rb4 29. Ra1 Rxd4 30. Rb2 Nxf4 31. Re1 Nxd3 32. Rb7 Nxe1 33. Rxe7 a3 34. Rg7+ Kh8 35. Rf7 Re4 36. e7 Rxe7 37. Rxe7 Nc2 38. Ra7 Kg8 39. Kg2 Rb8 40. Kf3 d5 41. Kf4 Re8 42. Kg5 Re6 43. Ra8+ Kf7 44. Ra7+ Re7 45. Ra6 Re6 46. Ra7+ Re7 47. Ra6 Re6 48. Ra7+ Re7 49. Ra6 d4 50. Rf6+ Ke8 51. Rf8+ Kd7 52. Ra8 d3 53. Kf6 Re6+ 54. Kf7 Re2 55. Ra7+ Kc6 56. Be3 Rxe3 57. fxe3 d2 58. Ra6+ Kb5 59. Rd6 a2 60. Rxd2 a1Q 61. Rxc2 Qa7+ 62. Kf6 Qxe3 63. Rb2+ Kc4 64. Rc2+ Kb3 65. Rc8 Qb6+ 66. Kg5 Qg1+ 67. Kf6 Qxh2 68. Ra8 Qh4+ 69. Ke6 Qe4+ 70. Kf6 Qxa8 71. Kg7 f4 72. Kh6 f3 73. Kg7 f2 74. Kh6 f1R 75. Kg5 h6+ 76. Kxg6 Qg2+ 77. Kh7 Rf7+ 78. Kh8 Qa8# 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.17"]
[Round "3"]
[White "Koster, Tobias"]
[Black "Remans, Nathan"]
[Result "0-1"]
[ECO "B51"]
[PlyCount "110"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nxd4 5. Qxd4 d6 6. Bb5+ Bd7 7. Bxd7+ Qxd7 8. Nc3 Nf6 9. 0-0 g6 10. Nd5 Bg7 11. Rd1 0-0 12. e5 Nxd5 13. Qxd5 Bxe5 14. c4 Rac8 15. Be3 b6 16. Rab1 e6 17. Qd3 Qa4 18. f4 Bf6 19. Qb3 Qxb3 20. axb3 Rfd8 21. b4 Rxc4 22. Bd2 d5 23. b3 Rc6 24. Rbc1 Rdc8 25. Rxc6 Rxc6 26. Ra1 Rc7 27. Kf2 Kf8 28. b5 Ke7 29. Ke3 h5 30. Bb4+ Kd7 31. Kd3 Kc8 32. h3 Kb7 33. Ra6 Rc1 34. Ra2 Rf1 35. Ke3 Rb1 36. Ra3 Rb2 37. Kf3 d4 38. Be1 Be7 39. b4 Rb1 40. Bg3 f5 41. Bf2 Bf6 42. Bg3 Rxb4 43. Rd3 Rxb5 44. Bf2 Rb4 45. g4 hxg4+ 46. hxg4 a5 47. gxf5 gxf5 48. Kg3 a4 49. Kh3 Rb3 50. Rxb3 axb3 51. Be1 b2 52. Bc3 dxc3 53. Kg3 b1Q 54. Kh3 Qh1+ 55. Kg3 Bh4# 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.17"]
[Round "1"]
[White "Koster, Tobias"]
[Black "Van Hoorn, Geert"]
[Result "0-1"]
[ECO "C45"]
[PlyCount "74"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Nxd4 6. Bxd4 Bxd4 7. Qxd4 Qf6 8. Qxf6 Nxf6 9. Nc3 0-0 10. Bd3 d6 11. 0-0 Bd7 12. Rfe1 Rfe8 13. Nd5 Nxd5 14. exd5 Re5 15. Rxe5 dxe5 16. Re1 f6 17. Bc4 Kf8 18. Rd1 Rd8 19. h3 Bf5 20. Rd2 c6 21. d6 Ke8 22. g4 Bg6 23. f3 Bf7 24. Bf1 Kd7 25. c4 c5 26. b3 Ke6 27. Bg2 Rxd6 28. Rxd6+ Kxd6 29. Kf2 Bg6 30. Ke3 Bb1 31. a3 Ba2 32. f4 b6 33. fxe5+ Kxe5 34. Be4 Bxb3 35. Kd3 h6 36. h4 Bd1 37. Bf5 Kf4 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.17"]
[Round "2"]
[White "Van Rijkom, Vincent"]
[Black "Koster, Tobias"]
[Result "1-0"]
[ECO "B24"]
[PlyCount "61"]
[EventDate "2012.05.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. g3 Nc6 3. Bg2 g6 4. d3 Bg7 5. Nc3 Qb6 6. Nf3 d6 7. 0-0 Bg4 8. h3 Bxf3 9. Qxf3 Nd4 10. Qd1 Nh6 11. Rb1 0-0 12. Be3 Nc6 13. Qd2 a6 14. Bxh6 Bxc3 15. Qxc3 Nd4 16. Kh1 Rfe8 17. Qd2 f6 18. c3 Nc6 19. Be3 Ne5 20. f4 Nc6 21. f5 g5 22. Bxg5 fxg5 23. Qxg5+ Kh8 24. f6 Rg8 25. Qh4 Qb5 26. c4 Qa4 27. f7 Rgf8 28. e5 Nxe5 29. Be4 h5 30. Qxh5+ Kg7 31. Qh7# 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.03"]
[Round "6"]
[White "Koster, Tobias"]
[Black "Reddy, Quinten"]
[Result "1/2-1/2"]
[ECO "C41"]
[PlyCount "29"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 d6 3. Nc3 g6 4. Bc4 Nf6 5. d3 Bg7 6. h3 0-0 7. Qe2 Nc6 8. Be3 a6 9. 0-0-0 Nb4 10. a3 Nc6 11. g4 b5 12. Bd5 Nxd5 13. exd5 Ne7 14. h4 Bb7 15. h5 1/2-1/2

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.03"]
[Round "9"]
[White "Koster, Tobias"]
[Black "Seyed Mehdi, Dominick"]
[Result "1-0"]
[ECO "C47"]
[PlyCount "109"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Nf6 6. Nc3 Nxd4 7. Bxd4 Bxd4 8. Qxd4 0-0 9. Bd3 d6 10. 0-0-0 Be6 11. f4 c5 12. Qe3 Bg4 13. Rdf1 Re8 14. h3 Bd7 15. g4 Re7 16. g5 Ne8 17. h4 g6 18. h5 Nc7 19. hxg6 fxg6 20. Qf2 Qf8 21. Qh4 Qg7 22. Bc4+ Kf8 23. Nd5 Nxd5 24. Bxd5 Bc6 25. Bxc6 bxc6 26. f5 Ke8 27. f6 Qf7 28. fxe7 Qxe7 29. Qxh7 Qxh7 30. Rxh7 a5 31. Rff7 d5 32. Rfg7 Kf8 33. Rf7+ Kg8 34. Rc7 dxe4 35. Rhe7 Kf8 36. Rxe4 a4 37. Rxc6 Kf7 38. Rxc5 Rd8 39. Ra5 Kg7 40. Raxa4 Rf8 41. Re7+ Kg8 42. Rh4 Rf1+ 43. Kd2 Rf2+ 44. Re2 Rf8 45. Reh2 Kf7 46. Rf2+ Ke7 47. Rxf8 Kxf8 48. Rh7 Kg8 49. Rb7 Kf8 50. a4 Ke8 51. a5 Kd8 52. a6 Kc8 53. b4 Kd8 54. a7 Kc8 55. a8Q# 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.03"]
[Round "7"]
[White "Makkus, Stijn"]
[Black "Koster, Tobias"]
[Result "0-1"]
[ECO "C55"]
[PlyCount "90"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bc4 Bc5 5. Ng5 0-0 6. a3 a6 7. d3 b5 8. Bxf7+ Rxf7 9. Nxf7 Kxf7 10. Qf3 Nd4 11. Qd1 d6 12. 0-0 Qe7 13. Bg5 h6 14. Be3 Bg4 15. f3 Bh5 16. Bxd4 Bxd4+ 17. Kh1 Rg8 18. Nd5 Nxd5 19. exd5 Bxb2 20. Ra2 Bd4 21. g4 Bg6 22. f4 exf4 23. Rxf4+ Ke8 24. Rxd4 Qe5 25. Qg1 c5 26. c3 cxd4 27. cxd4 Qxd5+ 28. Qg2 Qxg2+ 29. Rxg2 Bxd3 30. g5 Be4 31. gxh6 Bxg2+ 32. Kxg2 gxh6+ 33. Kf2 d5 34. Ke2 Rg2+ 35. Kd3 Rxh2 36. Kc3 h5 37. Kb4 h4 38. Ka5 Rf2 39. Kxa6 h3 40. Kxb5 h2 41. a4 h1Q 42. a5 Rc2 43. Ka6 Qb1 44. Ka7 Rc7+ 45. Ka8 Qb7# 0-1

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.03"]
[Round "8"]
[White "Van Kuiken, Jelle"]
[Black "Koster, Tobias"]
[Result "0-1"]
[ECO "C48"]
[PlyCount "76"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. Bxc6 dxc6 6. 0-0 Be6 7. d3 0-0 8. Nxe5 Qd6 9. Nc4 Bxc4 10. dxc4 Qe5 11. Re1 Rad8 12. Qf3 Bd6 13. Bf4 Qxf4 14. Qxf4 Bxf4 15. e5 Ng4 16. Rad1 Rxd1 17. Rxd1 Nxe5 18. b4 Nxc4 19. Rd7 Re8 20. g3 Be5 21. Ne4 g6 22. Ng5 Rf8 23. f4 Bf6 24. Rxc7 Bxg5 25. fxg5 Rb8 26. Kf2 a5 27. bxa5 Nxa5 28. Kf3 Rd8 29. Ke4 Rd2 30. h4 Rxc2 31. Ke5 Rf2 32. g4 h5 33. gxh5 gxh5 34. Rc8+ Kg7 35. Ra8 Rxa2 36. Kd6 Nc4+ 37. Ke7 Rxa8 38. Kd7 b6 0-1

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.02"]
[Round "3"]
[White "Baselmans, Luuk"]
[Black "Koster, Tobias"]
[Result "1-0"]
[ECO "C44"]
[PlyCount "95"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. c3 dxc3 6. Bxf7+ Kxf7 7. Qd5+ Ke8 8. Qxc5 cxb2 9. Bxb2 Nf6 10. 0-0 d6 11. Qc2 Qe7 12. Nc3 Bg4 13. Qd1 Bxf3 14. Qxf3 Nd4 15. Qd3 c5 16. Qd1 Rc8 17. Qa4+ Nd7 18. e5 dxe5 19. f4 exf4 20. Rae1 Ne6 21. Qc4 Rc6 22. Nb5 Kd8 23. Nxa7 Rd6 24. Rxf4 Rf8 25. Rfe4 Nf6 26. Rxe6 Qd7 27. Rxd6 Qxd6 28. Bxf6+ Rxf6 29. Qc2 Qd4+ 30. Kh1 c4 31. Rd1 Ke7 32. Qe2+ Re6 33. Qxe6+ Kxe6 34. Rxd4 c3 35. Rc4 Kd5 36. Rxc3 Kd4 37. Nb5+ Kd5 38. Kg1 b6 39. Kf2 h6 40. h4 g6 41. g4 g5 42. h5 Ke4 43. Rf3 Ke5 44. Ke3 Kd5 45. Rf6 Kc5 46. Rxh6 Kxb5 47. Rg6 Kc5 48. h6 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.02"]
[Round "2"]
[White "Koster, Tobias"]
[Black "Huisman, Tim"]
[Result "1-0"]
[ECO "C44"]
[PlyCount "105"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 Nf6 4. dxe5 Nxe4 5. Qd5 Nc5 6. Bc4 Ne6 7. Bf4 h6 8. Nc3 a6 9. 0-0-0 d6 10. exd6 Bxd6 11. Bxd6 cxd6 12. Qxd6 Qxd6 13. Rxd6 0-0 14. Bxe6 Bxe6 15. Nd4 Nxd4 16. Rxd4 Rad8 17. Rxd8 Rxd8 18. Rd1 Rxd1+ 19. Kxd1 b5 20. a3 Bd7 21. Nd5 Kf8 22. Nc7 a5 23. Kd2 b4 24. axb4 axb4 25. Na6 Bc6 26. g3 b3 27. cxb3 Bb5 28. Nc7 Bc6 29. b4 Ke7 30. Kc3 Kd6 31. Na6 Bb5 32. Nc5 Ke5 33. Nd3+ Bxd3 34. Kxd3 Kd5 35. b3 Kc6 36. Kc4 f5 37. b5+ Kb6 38. b4 h5 39. h4 g6 40. f4 Kb7 41. Kc5 Ka7 42. Kc6 Kb8 43. b6 Kc8 44. b5 Kb8 45. b7 g5 46. hxg5 h4 47. gxh4 Ka7 48. g6 Kb8 49. g7 Ka7 50. b6+ Ka6 51. g8Q Ka5 52. Qb3 Ka6 53. Qb5# 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.02"]
[Round "4"]
[White "Koster, Tobias"]
[Black "Korenwinder, Tom"]
[Result "0-1"]
[ECO "B70"]
[PlyCount "60"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Nc3 Nf6 4. d4 cxd4 5. Nxd4 g6 6. f3 Bg7 7. Bg5 0-0 8. Bxf6 Bxf6 9. Bc4 Nc6 10. Nxc6 bxc6 11. Qd2 Bd7 12. 0-0-0 c5 13. Qh6 e6 14. Rxd6 Bg5+ 15. Qxg5 Qxg5+ 16. Kd1 Qxg2 17. Rf1 Rad8 18. a3 Bc8 19. Rxd8 Rxd8+ 20. Kc1 e5 21. Nd5 Be6 22. Rd1 Bxd5 23. Bxd5 Qxh2 24. Bxf7+ Kxf7 25. Rxd8 Ke7 26. Ra8 c4 27. Rxa7+ Kf6 28. b4 cxb3 29. cxb3 Qg1+ 30. Kc2 Qxa7 0-1

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.02"]
[Round "5"]
[White "Scheerhoorn, Joep"]
[Black "Koster, Tobias"]
[Result "1-0"]
[ECO "B32"]
[PlyCount "45"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nxc6 bxc6 6. Bc4 Bc5 7. 0-0 Nf6 8. Nc3 d6 9. a3 Qe7 10. h3 Nh5 11. Qxh5 d5 12. exd5 cxd5 13. Bxd5 Rb8 14. Re1 Be6 15. Bxe6 Qxe6 16. Rxe5 0-0 17. Rxe6 fxe6 18. Qxc5 Rbc8 19. Qxa7 g6 20. Bh6 Rf7 21. Qa6 Re8 22. Ne4 e5 23. Nd6 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2010.04.02"]
[Round "1"]
[White "Van der Knijff, Gerhard"]
[Black "Koster, Tobias"]
[Result "1/2-1/2"]
[ECO "B01"]
[PlyCount "49"]
[EventDate "2010.04.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qe5+ 4. Be2 Nc6 5. Nf3 Qc5 6. d3 Nf6 7. Be3 Qb4 8. Rb1 e5 9. 0-0 Bf5 10. a3 Qd6 11. Nb5 Qd7 12. c3 a6 13. Na7 Nxa7 14. Qb3 b6 15. Nxe5 Qe6 16. Qxe6+ fxe6 17. Bf3 Rd8 18. Rbd1 Bd6 19. Nc4 Bc5 20. d4 Bd6 21. Bg5 h6 22. Be3 Bc2 23. Rd2 Bb3 24. Nxd6+ cxd6 25. Re1 1/2-1/2

