[Event "Haarlem Nova College op-B 12th"]
[Site "Haarlem"]
[Date "2013.06.29"]
[Round "2"]
[White "Koeman, Cas"]
[Black "Schol Grin, Anneke"]
[Result "0-1"]
[ECO "B13"]
[PlyCount "40"]
[EventDate "2013.06.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 c6 2. Nf3 d5 3. exd5 cxd5 4. d4 Nc6 5. Nc3 Bf5 6. Bb5 e6 7. 0-0 Nf6 8. Ne5 Rc8 9. Bg5 Be7 10. Bxc6+ bxc6 11. Ne2 h6 12. Bh4 0-0 13. Ng3 Bh7 14. Ne2 c5 15. Bg3 cxd4 16. Nxd4 Qb6 17. b3 Rfd8 18. Rc1 Ba3 19. Ra1 Bb2 20. Rb1 Bxd4 0-1

[Event "Haarlem Nova College op-B 12th"]
[Site "Haarlem"]
[Date "2013.06.29"]
[Round "3"]
[White "Koeman, Cas"]
[Black "Van Diepen, Peter"]
[Result "1-0"]
[ECO "B22"]
[PlyCount "71"]
[EventDate "2013.06.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. c3 d5 4. exd5 exd5 5. d4 Nc6 6. Bb5 Nf6 7. 0-0 Be7 8. Ne5 Qb6 9. Bxc6+ bxc6 10. Qc2 c4 11. Bg5 0-0 12. Nd2 h6 13. Bh4 Be6 14. f4 c5 15. f5 Bc8 16. Ndf3 cxd4 17. cxd4 Re8 18. Kh1 Ne4 19. Bxe7 Rxe7 20. Nd2 Nxd2 21. Qxd2 f6 22. Ng6 Re4 23. Rae1 Bb7 24. Rxe4 dxe4 25. Qe2 Qb4 26. Rc1 Bd5 27. Nf4 Bf7 28. d5 Rc8 29. h3 Qc5 30. Qxe4 Re8 31. Ne6 Qf2 32. Rc2 Qf1+ 33. Kh2 g6 34. fxg6 Bxe6 35. dxe6 f5 36. Qb7 1-0

[Event "Haarlem Nova College op-B 12th"]
[Site "Haarlem"]
[Date "2013.06.29"]
[Round "4"]
[White "Kuijs, Gerard"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "C65"]
[WhiteElo "1609"]
[PlyCount "150"]
[EventDate "2013.06.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Bb4+ 5. c3 Bd6 6. 0-0 0-0 7. Bg5 a6 8. Ba4 b5 9. Bc2 Be7 10. d4 exd4 11. cxd4 Nb4 12. Nc3 h6 13. Bh4 Nxc2 14. Qxc2 b4 15. Bxf6 Bxf6 16. Nd5 c6 17. Nxb4 Qb6 18. Qd2 Rb8 19. a3 a5 20. e5 Bg5 21. Nxg5 hxg5 22. Na2 Ba6 23. Rfb1 Rfd8 24. Qe3 Re8 25. Nc3 d6 26. Qxg5 Qxd4 27. exd6 Qxd6 28. Re1 Rbd8 29. h3 Qc7 30. Rac1 Qb6 31. Na4 Qb3 32. Nc5 Qb5 33. Rxe8+ Rxe8 34. Qd2 Qb6 35. Nxa6 Qxa6 36. Qd7 Rc8 37. Re1 Qa8 38. Re7 Rf8 39. Qb7 Qd8 40. Rd7 Qf6 41. Rd1 Qe5 42. Qb6 Kh7 43. Qd4 Qe7 44. Kf1 Re8 45. Qd3+ Kg8 46. Qd2 Qc5 47. Qd4 Qb5+ 48. Kg1 Qe2 49. Qd2 Qe5 50. g3 Qb5 51. b4 axb4 52. axb4 Rb8 53. Kg2 Qb7 54. f3 Qb5 55. g4 Kh8 56. Qc3 Qe2+ 57. Kg3 Qxd1 58. Qxc6 Qe1+ 59. Kg2 Qxb4 60. h4 Qb2+ 61. Kg3 Qe5+ 62. Kh3 Kg8 63. h5 Re8 64. Qc4 Qe3 65. Qd5 Qe1 66. Qc6 Qh1+ 67. Kg3 Qe1+ 68. Kh3 Qe7 69. h6 g6 70. Qc3 Qf8 71. g5 f6 72. Qc4+ Kh7 73. f4 fxg5 74. fxg5 Qf3+ 75. Kh2 Re2+ 0-1

[Event "Haarlem Nova College op-B 12th"]
[Site "Haarlem"]
[Date "2013.06.28"]
[Round "1"]
[White "Spook, Michiel"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "A51"]
[PlyCount "35"]
[EventDate "2013.06.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. a3 Bc5 5. e3 a5 6. Nf3 Bb6 7. Qc2 Nc5 8. Nc3 d6 9. exd6 Qxd6 10. Be2 0-0 11. 0-0 Nc6 12. Ng5 f5 13. Bf3 Qg6 14. Bd5+ Be6 15. Nxe6 Nxe6 16. b3 Kh8 17. Bb2 f4 18. Qxg6 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.11"]
[Round "8"]
[White "Hilwerda, Jonas"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "C58"]
[PlyCount "45"]
[EventDate "2013.05.09"]
[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. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ Bd7 7. Qe2 Bd6 8. Nc3 c6 9. dxc6 Nxc6 10. Nge4 Bb4 11. a3 Bxc3 12. dxc3 Nxe4 13. Qxe4 0-0 14. Be3 a6 15. Bxc6 Bxc6 16. Qxe5 b5 17. 0-0 Qh4 18. Qg3 Qf6 19. Bd4 Qh6 20. Rfe1 Rad8 21. Re3 f5 22. Qh3 Qg6 23. Rg3 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.11"]
[Round "7"]
[White "Koeman, Cas"]
[Black "Burger, Sem"]
[Result "1-0"]
[ECO "B02"]
[PlyCount "77"]
[EventDate "2013.05.09"]
[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 d5 2. exd5 Nf6 3. Nc3 Nxd5 4. Bc4 Be6 5. Bb3 Nc6 6. Nf3 Qd7 7. h3 Nf4 8. Rh2 0-0-0 9. d3 Nd5 10. Bd2 g6 11. Qe2 Bg7 12. Nxd5 Bxd5 13. 0-0-0 Bxb3 14. axb3 Qd6 15. Rhh1 h6 16. Qe1 Rhe8 17. Bc3 e5 18. Nd2 b5 19. Ne4 Qe7 20. b4 f5 21. Nc5 Qg5+ 22. Kb1 Qxg2 23. Rg1 Qxh3 24. Rxg6 Bh8 25. Rxc6 e4 26. Bxh8 exd3 27. Qc3 dxc2+ 28. Qxc2 Rxh8 29. Rxd8+ Rxd8 30. Na6 Qf1+ 31. Ka2 Rd1 32. Qxf5+ Kd8 33. Qf8+ Kd7 34. Rxc7+ Ke6 35. Re7+ Kd6 36. Qd8+ Kc6 37. Rc7+ Kb6 38. Qb8+ Kxa6 39. Rxa7# 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.11"]
[Round "9"]
[White "Steunenberg, Renso"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "C55"]
[PlyCount "92"]
[EventDate "2013.05.09"]
[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. Bc4 Nf6 4. d3 d6 5. h3 Be7 6. Nc3 Bd7 7. 0-0 0-0 8. Be3 Be6 9. Nd5 Na5 10. Nxf6+ Bxf6 11. Bb3 Nxb3 12. axb3 d5 13. exd5 Bxd5 14. d4 exd4 15. Nxd4 Qe7 16. c3 Rfd8 17. Re1 c5 18. Nf3 Qc7 19. Nd2 Qc6 20. Qg4 Be6 21. Qg3 Rd6 22. Rad1 Rad8 23. c4 Bxb2 24. f3 Kh8 25. Qf2 Bc3 26. Qe2 Qd7 27. f4 f5 28. Bxc5 Rxd2 29. Rxd2 Bxd2 30. Qxe6 Bxe1 31. Qxe1 Qd1 32. Qxd1 Rxd1+ 33. Kh2 Rb1 34. Bxa7 Rxb3 35. c5 h6 36. Bb6 g5 37. fxg5 hxg5 38. Bd8 g4 39. hxg4 fxg4 40. Be7 Kg7 41. Bd6 Kg6 42. Be7 Kf5 43. g3 Rf3 44. Kg2 Ke5 45. Bd6+ Kd5 46. Be7 Rc3 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.10"]
[Round "4"]
[White "Halfhide, Sebastian"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "A29"]
[PlyCount "79"]
[EventDate "2013.05.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. g3 Nc6 4. Bg2 Bc5 5. Nf3 d6 6. 0-0 Bf5 7. d3 Qd7 8. Bg5 Qe6 9. Nd5 Rc8 10. Qb3 Bb6 11. Rad1 h6 12. Bxf6 gxf6 13. e3 Bg4 14. Rde1 Ne7 15. d4 Nxd5 16. cxd5 Qe7 17. Nd2 Ba5 18. Qa4+ Bd7 19. Qxa5 a6 20. f4 Bb5 21. Rf2 exd4 22. e4 0-0 23. Nf3 d3 24. Nd4 Qd7 25. Nxb5 axb5 26. Qc3 Ra8 27. a3 f5 28. Qxd3 fxe4 29. Rxe4 Rfe8 30. Rfe2 Rxe4 31. Qxe4 Qg4 32. Re1 h5 33. Qe7 Rc8 34. Qf6 Kf8 35. Qh8+ Qg8 36. Qxh5 Qg7 37. Qe2 Qd4+ 38. Kh1 Qf6 39. Qxb5 b6 40. Qd7 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.10"]
[Round "5"]
[White "Koeman, Cas"]
[Black "Van Klaveren, Justus"]
[Result "1/2-1/2"]
[ECO "C36"]
[PlyCount "84"]
[EventDate "2013.05.09"]
[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. f4 d5 3. exd5 exf4 4. Nf3 Nf6 5. Bc4 Qe7+ 6. Be2 Nxd5 7. 0-0 g6 8. Re1 Be6 9. Nc3 Qc5+ 10. Kh1 Bg7 11. Nxd5 Qxd5 12. d4 0-0 13. Bxf4 c5 14. c4 Qd7 15. d5 Bf5 16. Be5 Qd8 17. Bxg7 Kxg7 18. Bd3 Bxd3 19. Qxd3 Qf6 20. b3 Nd7 21. Rf1 Rae8 22. Nd2 Qe5 23. Nf3 Qf6 24. Qd2 Re7 25. Ng5 Qd6 26. Rae1 Rfe8 27. Rxe7 Rxe7 28. Qc3+ Nf6 29. Nf3 Kg8 30. Ng5 h6 31. Nf3 Ne4 32. Qc1 Nf6 33. Qxh6 Ng4 34. Qh3 Qf4 35. Qg3 Qf5 36. Re1 Rxe1+ 37. Qxe1 Qf4 38. h3 Nf6 39. Qd1 Ne4 40. Qe1 Ng3+ 41. Kg1 Ne4 42. Qe2 Ng3 1/2-1/2

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.10"]
[Round "6"]
[White "Kroetkov, Ivan"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "D07"]
[PlyCount "64"]
[EventDate "2013.05.09"]
[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 Nc6 2. d4 d5 3. c4 e6 4. e3 Nf6 5. c5 Be7 6. Nc3 0-0 7. Bd3 b6 8. Bb5 Bd7 9. Bxc6 Bxc6 10. b4 a5 11. b5 Bd7 12. c6 Bc8 13. 0-0 Bd6 14. Re1 Re8 15. e4 Bb4 16. Bb2 Nxe4 17. Re3 Bxc3 18. Bxc3 f6 19. Nd2 Nxd2 20. Bxd2 e5 21. Qe2 e4 22. Qh5 Be6 23. Rg3 Bf7 24. Qh6 Bg6 25. Qe3 f5 26. Qe2 Qf6 27. Bf4 Rac8 28. Rd1 Qh4 29. Be5 Bh5 30. Rxg7+ Kf8 31. Qc2 Bxd1 32. Qxd1 Rxe5 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.09"]
[Round "2"]
[White "Kanters, Cor"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "A51"]
[PlyCount "91"]
[EventDate "2013.05.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. e3 e4 4. Nc3 Bb4 5. Bd2 Nc6 6. Nge2 d6 7. Qc2 Bf5 8. Ng3 Bg6 9. Qb3 Rb8 10. Ncxe4 Nxe4 11. Nxe4 Bxe4 12. Bxb4 Nxb4 13. Qxb4 Qg5 14. Qa4+ Bc6 15. Qxa7 0-0 16. d5 Bd7 17. Qd4 Rbe8 18. g3 f5 19. h4 Qh6 20. Bh3 Re7 21. 0-0 g5 22. Kh2 Re4 23. hxg5 Qxg5 24. Qd3 Qh5 25. Rh1 Rfe8 26. Kg1 Qg6 27. Bg2 Rg4 28. Qe2 f4 29. Bf3 fxe3 30. Bxg4 exf2+ 31. Qxf2 Qxg4 32. Rf1 Qg7 33. Rh4 h6 34. Rf4 Bh3 35. Rf7 Qe5 36. Rf8+ Rxf8 37. Qxf8+ Kh7 38. Qf7+ Qg7 39. Rf4 Bc8 40. Kf2 c6 41. dxc6 bxc6 42. Qxg7+ Kxg7 43. Rd4 Be6 44. a4 d5 45. cxd5 cxd5 46. a5 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.09"]
[Round "1"]
[White "Koeman, Cas"]
[Black "Dharmoputro, Griffin"]
[Result "1-0"]
[ECO "C31"]
[PlyCount "121"]
[EventDate "2013.05.09"]
[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. f4 d5 3. exd5 Qh4+ 4. g3 Qf6 5. Qe2 Bd6 6. d4 Nd7 7. dxe5 Nxe5 8. fxe5 Qxe5 9. Qxe5+ Bxe5 10. Nf3 Bf6 11. Bb5+ Bd7 12. Bxd7+ Kxd7 13. Nc3 Re8+ 14. Kf2 Nh6 15. Bxh6 gxh6 16. Rhe1 Rhg8 17. h3 c6 18. Rab1 Rxe1 19. dxc6+ Kxc6 20. Rxe1 b6 21. Re4 Kb7 22. Rf4 Bxc3 23. Rxf7+ Ka6 24. bxc3 Rc8 25. Rxh7 Rxc3 26. Ne1 Rc6 27. h4 Rf6+ 28. Kg2 Re6 29. Kf2 Rf6+ 30. Ke2 Re6+ 31. Kd2 Rd6+ 32. Nd3 Rg6 33. g4 Rxg4 34. Rxh6 Rg2+ 35. Kc3 Rg7 36. Rh8 Rc7+ 37. Kb3 Rg7 38. h5 Rg1 39. Kb2 Rg5 40. h6 Rb5+ 41. Kc1 Rh5 42. h7 Rh1+ 43. Kb2 Rh4 44. Ne5 Rh5 45. Ng6 Rb5+ 46. Kc1 Rh5 47. Nf8 Rh1+ 48. Kb2 Rh5 49. Rg8 Rb5+ 50. Kc1 Rf5 51. h8Q Rf1+ 52. Kb2 Rf5 53. Rg3 Rb5+ 54. Rb3 Rc5 55. Qh3 Rc6 56. Ra3+ Kb5 57. Qf5+ Kb4 58. Qd7 Rf6 59. c4 Kc5 60. Qd5+ Kb4 61. Qb5# 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2013.05.09"]
[Round "3"]
[White "Koeman, Cas"]
[Black "Emans, Job"]
[Result "1-0"]
[ECO "C25"]
[PlyCount "41"]
[EventDate "2013.05.09"]
[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. f4 exf4 3. Nf3 Nc6 4. Nc3 Bc5 5. Bc4 d6 6. d4 Bb4 7. 0-0 Nge7 8. Bxf4 0-0 9. Qe1 Re8 10. Ng5 Rf8 11. Qg3 Ng6 12. Bxf7+ Rxf7 13. Nxf7 Kxf7 14. Bg5+ Kg8 15. Bxd8 Nxd8 16. Qf3 Be6 17. Nd5 Nf7 18. Nf4 Ne7 19. Nxe6 h6 20. Qxf7+ Kh7 21. Qxg7# 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.19"]
[Round "8"]
[White "De Haas, Lars"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "B34"]
[PlyCount "62"]
[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 Nf6 5. Nc3 g6 6. g3 Bg7 7. Nf3 0-0 8. Bg2 d6 9. 0-0 Bg4 10. Rb1 Ne5 11. h3 Nxf3+ 12. Bxf3 Bxh3 13. g4 Bxf1 14. Qxf1 Nd7 15. Bf4 Ne5 16. Be2 Qc7 17. Nd5 Qxc2 18. Nxe7+ Kh8 19. Bxe5 Bxe5 20. Bd3 Qc5 21. a3 Bg7 22. b4 Qg5 23. Nd5 Qxg4+ 24. Kh1 Be5 25. f4 Bg7 26. Re1 Qh4+ 27. Kg1 Bd4+ 28. Kg2 g5 29. fxg5 Qxg5+ 30. Kh2 Rg8 31. Qh3 Rg6 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.19"]
[Round "9"]
[White "Koeman, Cas"]
[Black "Wagenvoorde, Guido"]
[Result "1-0"]
[ECO "B44"]
[PlyCount "79"]
[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 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nxc6 bxc6 6. Nc3 Bc5 7. Be2 d5 8. exd5 cxd5 9. 0-0 Nf6 10. Bg5 0-0 11. Bd3 Rb8 12. Rb1 e5 13. Be2 Bb7 14. Bf3 e4 15. Bg4 Qd6 16. Bxf6 gxf6 17. Bf5 Qf4 18. Qh5 h6 19. Rfd1 Bxf2+ 20. Kh1 d4 21. Ne2 Qh4 22. Qxh4 Bxh4 23. Rxd4 e3 24. Rxh4 Kg7 25. Bd3 Rfe8 26. b3 Re5 27. Re1 Rg8 28. Ng3 Bc8 29. Nh5+ Kf8 30. Nxf6 Rg7 31. Nh5 Rgg5 32. Ng3 Kg7 33. Re4 Ra5 34. R4xe3 Rxa2 35. Re7 Be6 36. R1xe6 Kf8 37. Re1 Rga5 38. h3 Rg5 39. Nf5 Ra5 40. Re8# 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.19"]
[Round "7"]
[White "Koeman, Cas"]
[Black "Zijdemans, Zowie"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "139"]
[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 d6 2. Nf3 Nf6 3. Nc3 Nbd7 4. Bc4 h6 5. d4 e5 6. dxe5 dxe5 7. h3 c6 8. Be3 Qc7 9. a3 Be7 10. Qd2 Nf8 11. Bb3 Be6 12. Bxe6 Nxe6 13. Qe2 Nf4 14. Bxf4 exf4 15. 0-0 0-0 16. Nd4 Qe5 17. Nf5 Rad8 18. Rfe1 Bd6 19. Qf3 Rfe8 20. Nxd6 Rxd6 21. Rab1 Rd4 22. Qe2 Nxe4 23. f3 Nxc3 24. Qxe5 Rxe5 25. bxc3 Rxe1+ 26. Rxe1 Rc4 27. Re7 Rxc3 28. Rxb7 Rxa3 29. Rb4 g5 30. Rc4 Ra6 31. Kf2 Rb6 32. Ke2 a5 33. Kd3 Ra6 34. Ra4 f5 35. Kd4 Kg7 36. Ke5 Kg6 37. c4 h5 38. c5 Ra7 39. Kd6 g4 40. Kxc6 Kf6 41. Kb6 Ra8 42. Kb7 Re8 43. fxg4 fxg4 44. hxg4 hxg4 45. Rxf4+ Kg5 46. Rc4 Re5 47. c6 g3 48. c7 Re7 49. Kb8 Re8+ 50. c8Q Rxc8+ 51. Kxc8 Kf5 52. Kb7 Ke5 53. Ka6 Kf5 54. Kxa5 Ke5 55. Rg4 Kf5 56. Rxg3 Kf4 57. Rd3 Ke4 58. Rd2 Kf4 59. g3+ Kg4 60. Kb4 Kf3 61. Rd4 Kg2 62. g4 Kg3 63. g5 Kf3 64. g6 Kg3 65. g7 Kf3 66. g8Q Kf2 67. Qb3 Ke2 68. Rc4 Kd2 69. Rc2+ Kd1 70. Qb1# 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.18"]
[Round "4"]
[White "Kanger, Thomas"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "B34"]
[PlyCount "114"]
[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 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Qd2 0-0 8. 0-0-0 Qc7 9. Ndb5 Qa5 10. Bh6 a6 11. Bxg7 Kxg7 12. Na3 b5 13. Kb1 d6 14. Be2 Be6 15. f4 b4 16. Nc4 Bxc4 17. Bxc4 bxc3 18. Qxc3 Qxc3 19. bxc3 Nxe4 20. Rde1 Nxc3+ 21. Kb2 Na4+ 22. Ka3 Nc5 23. Bd5 Rac8 24. g4 Rfe8 25. f5 Nd4 26. Kb2 Nd7 27. c3 Nb5 28. c4 Nd4 29. Re4 Nc6 30. h4 Nf6 31. Rf4 Nxd5 32. cxd5 Ne5 33. g5 Nd3+ 34. Ka1 Nxf4 35. Rd1 Rb8 36. f6+ exf6 37. gxf6+ Kxf6 38. Rf1 Ke5 39. Re1+ Kxd5 40. Rd1+ Kc6 41. h5 Rbd8 42. h6 d5 43. a4 d4 44. a5 d3 45. Kb2 d2 46. Kc2 Rd5 47. Kc3 Re1 48. Rxd2 Rc1+ 49. Kb2 Rxd2+ 50. Kxc1 Rg2 51. Kd1 Kd5 52. Ke1 Ke4 53. Kd1 Ke3 54. Kc1 Kd3 55. Kb1 Kc3 56. Ka1 Kb3 57. Kb1 Rg1# 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.18"]
[Round "6"]
[White "Kanters, Cor"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "B50"]
[PlyCount "67"]
[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. Nc3 d6 3. Nf3 g6 4. d4 cxd4 5. Qxd4 f6 6. Be3 Bg7 7. Bc4 Nc6 8. Qd5 e6 9. Qd2 Nge7 10. Rd1 Na5 11. Bb5+ Nac6 12. Qxd6 Qxd6 13. Rxd6 0-0 14. 0-0 Kh8 15. Rfd1 f5 16. exf5 Nxf5 17. R6d2 e5 18. Bc5 Re8 19. Bxc6 bxc6 20. Rd8 Ba6 21. Rxe8+ Rxe8 22. Bxa7 e4 23. Re1 Bxc3 24. bxc3 Ra8 25. Bd4+ Nxd4 26. Nxd4 Bc4 27. Rxe4 Rxa2 28. h3 Bd5 29. Re8+ Kg7 30. Rc8 Kh6 31. Nxc6 Rxc2 32. Nb4 Rc1+ 33. Kh2 Rf1 34. Nxd5 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.18"]
[Round "5"]
[White "Koeman, Cas"]
[Black "Nguyen, Kevin"]
[Result "0-1"]
[ECO "B72"]
[PlyCount "127"]
[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 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Nc6 7. Bc4 Bg7 8. Qd2 0-0 9. 0-0 Ng4 10. Nxc6 bxc6 11. Bf4 Rb8 12. Bb3 Ba6 13. Rfe1 Ne5 14. Bxe5 Bxe5 15. Qe3 c5 16. Rab1 e6 17. Red1 Bb7 18. Ne2 Qh4 19. Ng3 Rbd8 20. Re1 Kh8 21. c3 Bg7 22. Rbd1 Bc8 23. Qd3 Be5 24. Qb5 Qe7 25. Qe2 Bb7 26. Qg4 Rc8 27. Bc2 Qc7 28. Re3 Qb6 29. Rb1 Qa5 30. a3 Rce8 31. Nf1 Bc8 32. Qh4 Kg7 33. Rh3 h5 34. Rf3 Ba6 35. Ng3 Bb7 36. Nxh5+ Kg8 37. Nf6+ Bxf6 38. Qxf6 Qd8 39. Qf4 Kg7 40. Qg4 Bc8 41. Qg3 Rh8 42. Qf4 Qe7 43. h3 Rh7 44. e5 d5 45. Rg3 Rh4 46. Qf3 Reh8 47. Re1 Bb7 48. Qd3 R8h6 49. Ree3 Qc7 50. Qd2 R4h5 51. Qe1 Qb6 52. Qc1 Qc7 53. f4 Rh4 54. Rg4 Rxg4 55. hxg4 Qc6 56. Re1 Rh4 57. g5 Qe8 58. Kf2 Qh8 59. Bb1 Rh2 60. Rg1 Qh4+ 61. Kf1 Ba6+ 62. c4 Bxc4+ 63. Qxc4 dxc4 64. g3 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.17"]
[Round "3"]
[White "Koeman, Cas"]
[Black "Mensing, Andrew"]
[Result "0-1"]
[ECO "B21"]
[PlyCount "80"]
[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. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Bc4 e6 6. Nf3 Bc5 7. Nb5 a6 8. Nd6+ Bxd6 9. Qxd6 Qe7 10. Qxe7+ Ngxe7 11. Bd2 b5 12. Bd3 Bb7 13. 0-0 0-0 14. Be3 Nb4 15. Rfd1 Nxd3 16. Rxd3 Bxe4 17. Rxd7 Nd5 18. Ng5 Bf5 19. Rc1 Nxe3 20. fxe3 h6 21. Nf3 Rac8 22. Rf1 Rc2 23. Rf2 Rfc8 24. Rdd2 Rc1+ 25. Rf1 Be4 26. Ne5 f6 27. Ng4 R8c2 28. Rxc1 Rxd2 29. Nf2 Bg6 30. Nh3 Rxb2 31. Nf4 Bf5 32. Rc8+ Kh7 33. Rc7 Rxa2 34. Nh5 Kg6 35. Nxg7 b4 36. Ne8 Be4 37. Rg7+ Kf5 38. Nd6+ Ke5 39. Nxe4 Kxe4 40. h3 b3 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.17"]
[Round "1"]
[White "Koeman, Cas"]
[Black "Warmerdam, Max"]
[Result "1-0"]
[ECO "C30"]
[PlyCount "75"]
[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. f4 Bc5 3. Nf3 d6 4. Nc3 Nc6 5. Bc4 Bg4 6. h3 Bxf3 7. Qxf3 Nd4 8. Qd3 exf4 9. h4 Nf6 10. b3 Nd7 11. Kd1 Ne5 12. Qf1 Nxc4 13. Qxc4 Qd7 14. Ne2 Qg4 15. Bb2 Qxg2 16. Re1 f3 17. Nxd4 f2 18. Rf1 Qxe4 19. Rxf2 0-0 20. Re2 Qxh4 21. Qd3 Rfe8 22. Nf3 Qh1+ 23. Re1 Rxe1+ 24. Nxe1 Re8 25. Qg3 g6 26. c4 Qf1 27. Kc2 Qf5+ 28. Nd3 f6 29. Qg2 c6 30. Rf1 Qg5 31. Qh3 f5 32. Nxc5 dxc5 33. Qc3 Re7 34. Qh8+ Kf7 35. Qg7+ Ke8 36. Qh8+ Kd7 37. Bf6 Qg2 38. Re1 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2012.05.17"]
[Round "2"]
[White "Verhoef, Pieter"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "B23"]
[PlyCount "71"]
[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. Nc3 Nc6 3. f4 d6 4. Nf3 Nf6 5. Bb5 Bd7 6. 0-0 g6 7. Bxc6 Bxc6 8. d3 Bg7 9. Qe1 Qc7 10. Bd2 0-0 11. Qh4 Rfd8 12. f5 Qb6 13. Rab1 c4+ 14. d4 Qc7 15. Bh6 b5 16. Ng5 Qb6 17. fxg6 hxg6 18. Bxg7 Kxg7 19. Rxf6 Qxd4+ 20. Kh1 Qxf6 21. e5 dxe5 22. Kg1 Rh8 23. Qg3 Rad8 24. Rf1 Qd6 25. Nxf7 Qd4+ 26. Rf2 b4 27. Nxd8 Qxd8 28. Qxe5+ Kh7 29. Rf7+ Kh6 30. Qe3+ g5 31. Qe6+ Kh5 32. Ne2 Bd7 33. Ng3+ Kh4 34. Nf5+ Kh5 35. Ng7+ Kh4 36. g3# 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.04"]
[Round "7"]
[White "Koeman, Cas"]
[Black "Bolleman, Danilo"]
[Result "0-1"]
[ECO "B40"]
[WhiteElo "1103"]
[BlackElo "1252"]
[PlyCount "54"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. d4 e6 3. Nf3 Qc7 4. Bd3 b6 5. 0-0 Nf6 6. e5 Nd5 7. c4 Nb4 8. Nc3 Bb7 9. a3 Nxd3 10. Qxd3 d5 11. Be3 dxc4 12. Qxc4 Bxf3 13. gxf3 Be7 14. d5 Qxe5 15. Bf4 Qf5 16. Bg3 Qxf3 17. dxe6 0-0 18. Rfe1 Re8 19. Bd6 Nc6 20. exf7+ Qxf7 21. Qxf7+ Kxf7 22. Ne4 Nd4 23. Bxe7 Nf3+ 24. Kg2 Nxe1+ 25. Rxe1 Rxe7 26. Ng5+ Ke8 27. Ne6 Kd7 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.04"]
[Round "8"]
[White "Remans, Nathan"]
[Black "Koeman, Cas"]
[Result "1/2-1/2"]
[ECO "C48"]
[WhiteElo "1389"]
[BlackElo "1103"]
[PlyCount "144"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 d6 5. h3 Be6 6. d3 Be7 7. Be3 0-0 8. Qd2 a6 9. Ba4 b5 10. Bb3 Qd7 11. Nd5 a5 12. a3 b4 13. axb4 axb4 14. Rxa8 Rxa8 15. 0-0 Na5 16. Qxb4 Nxb3 17. Qxb3 h6 18. c4 Nxd5 19. cxd5 Bxh3 20. gxh3 Qxh3 21. Nh2 Rc8 22. Qd1 Rb8 23. Qe2 Rc8 24. Qg4 Qxg4+ 25. Nxg4 Rb8 26. Rb1 Rb3 27. d4 exd4 28. Bxd4 Rb4 29. Rd1 c5 30. dxc6 Rc4 31. Bc3 Rxc6 32. f3 h5 33. Ne3 g6 34. Nd5 Bg5 35. f4 Bd8 36. Kg2 Rc5 37. Nf6+ Bxf6 38. Bxf6 Rc6 39. Kg3 Kf8 40. Kh4 d5 41. Be5 dxe4 42. Rd4 Re6 43. Rd1 e3 44. Re1 e2 45. b4 f6 46. Bc3 Ke8 47. Rg1 Kf7 48. b5 Rb6 49. Re1 Rxb5 50. Rxe2 Rf5 51. Bd2 Kg7 52. Re7+ Kf8 53. Rc7 Rd5 54. Bc1 Rd4 55. Ra7 Rc4 56. Ba3+ Kg8 57. Kg3 Rc3+ 58. Kh4 Rc4 59. Bd6 Rd4 60. Rd7 Rd5 61. Kg3 Rd3+ 62. Kf2 h4 63. Kg2 h3+ 64. Kh2 g5 65. fxg5 fxg5 66. Kh1 Rd2 67. Rd8+ Kf7 68. Bc7 Rc2 69. Bg3 Kf6 70. Rh8 g4 71. Rh4 Kg5 72. Rh8 Rg2 1/2-1/2

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.04"]
[Round "9"]
[White "Theunissen, Ryan"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "C66"]
[WhiteElo "685"]
[BlackElo "1103"]
[PlyCount "72"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d3 Nf6 5. 0-0 Be6 6. Nc3 Qe7 7. Ng5 Bd7 8. Be3 g6 9. b3 Bg7 10. Bc4 0-0 11. g3 Be6 12. Bxe6 fxe6 13. Qf3 Nd4 14. Bxd4 exd4 15. Nb5 e5 16. a4 Nh5 17. Qe2 c6 18. Na3 Qxg5 19. g4 Nf4 20. Qd1 h5 21. f3 d5 22. exd5 cxd5 23. Nb5 e4 24. dxe4 dxe4 25. Qxd4 Ne2+ 26. Kf2 Nxd4 27. Nxd4 Qd2+ 28. Ne2 e3+ 29. Kg1 Qxe2 30. Rae1 Qd2 31. Rxe3 Bd4 32. Rfe1 Bxe3+ 33. Rxe3 Qc1+ 34. Kg2 Qxe3 35. Kg3 Qxf3+ 36. Kh4 Qxg4# 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.03"]
[Round "5"]
[White "Koeman, Cas"]
[Black "Van Roon, Sjoerd"]
[Result "0-1"]
[ECO "C36"]
[WhiteElo "1103"]
[BlackElo "1322"]
[PlyCount "92"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. f4 exf4 3. Nf3 d5 4. exd5 Nf6 5. d4 Nxd5 6. c4 Nb6 7. Bxf4 Bg4 8. Be2 Bb4+ 9. Bd2 Be7 10. 0-0 Bxf3 11. Bxf3 Qxd4+ 12. Kh1 Nc6 13. Bxc6+ bxc6 14. Qf3 Qf6 15. Qxf6 Bxf6 16. Nc3 Nxc4 17. Rae1+ Kd7 18. Ne4 Nxd2 19. Nxf6+ gxf6 20. Rd1 Rad8 21. h3 Ke8 22. Rxf6 Rd7 23. Rxc6 Ne4 24. Rxd7 Kxd7 25. Rc4 Re8 26. Rd4+ Kc6 27. Rc4+ Kd7 28. Rd4+ Nd6 29. Rd2 Re3 30. Kg1 Re6 31. Kf2 Re5 32. Rc2 Ne4+ 33. Kg1 Kd6 34. Kf1 c5 35. g4 Kd5 36. b3 Kd4 37. Kg2 Nc3 38. Kf3 Re3+ 39. Kg2 Re2+ 40. Rxe2 Nxe2 41. Kf3 Nc3 42. a3 Nb5 43. a4 Nd6 44. Ke2 Kc3 45. a5 Kxb3 46. Kd2 Kb2 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.03"]
[Round "6"]
[White "Van Baar, Esper"]
[Black "Koeman, Cas"]
[Result "1/2-1/2"]
[ECO "C26"]
[WhiteElo "1050"]
[BlackElo "1103"]
[PlyCount "62"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. g3 Nc6 3. Bg2 Nf6 4. Ne2 Bc5 5. d3 d6 6. Nbc3 Bg4 7. h3 Bxe2 8. Qxe2 Nd4 9. Qd2 Bb4 10. a3 Ba5 11. b4 Bb6 12. Na4 0-0 13. Nxb6 cxb6 14. Bb2 Qc7 15. Bxd4 exd4 16. 0-0 Qc3 17. Qxc3 dxc3 18. a4 Rfe8 19. Rfe1 Rad8 20. Ra3 Rc8 21. Re3 a6 22. f4 d5 23. e5 d4 24. Re1 Rc7 25. Kf1 Rce7 26. Raa1 Nd7 27. Bxb7 a5 28. b5 Nc5 29. Bc6 Rc8 30. Re2 Re6 31. Rb1 Rg6 1/2-1/2

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.03"]
[Round "4"]
[White "Verhagen, Pieter"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "969"]
[BlackElo "1103"]
[PlyCount "49"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Bc5 5. Nc3 d6 6. Be3 Nd4 7. 0-0 Bg4 8. Bxd4 Bxd4 9. h3 Bh5 10. Bb5+ c6 11. Bc4 0-0 12. Qe2 Bxc3 13. bxc3 d5 14. exd5 cxd5 15. Bb3 e4 16. dxe4 dxe4 17. g4 exf3 18. Qxf3 Bg6 19. Rad1 Qb6 20. Qg3 Rad8 21. Rxd8 Rxd8 22. Re1 Ne4 23. Qf3 Rd2 24. Rxe4 Bxe4 25. Qxf7+ 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.02"]
[Round "1"]
[White "Koeman, Cas"]
[Black "Baselmans, Luuk"]
[Result "0-1"]
[ECO "C55"]
[WhiteElo "1103"]
[BlackElo "1369"]
[PlyCount "70"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Nxe4 5. Nxe4 d5 6. Bxd5 Qxd5 7. d3 Bf5 8. 0-0 0-0-0 9. Nc3 Qd7 10. Be3 Bg4 11. Qe2 Re8 12. Rad1 Nd4 13. Bxd4 exd4 14. Ne4 f5 15. Nd6+ Bxd6 16. Qd2 Bxf3 17. gxf3 Qf7 18. Qg5 Qg6 19. Qxg6 hxg6 20. Kg2 Rxh2+ 21. Kg1 Reh8 22. f4 R2h4 23. Kg2 Rg4+ 24. Kf3 Rxf4+ 25. Ke2 Re8+ 26. Kd2 Rf3 27. Rde1 Bf4+ 28. Kd1 Rxe1+ 29. Rxe1 Rxf2 30. Re8+ Kd7 31. Rg8 Rd2+ 32. Ke1 Rxc2 33. Rxg7+ Ke8 34. b3 Rxa2 35. Rxc7 Bxc7 0-1

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.02"]
[Round "3"]
[White "Koeman, Cas"]
[Black "Blees, Timothy"]
[Result "1-0"]
[ECO "B21"]
[WhiteElo "1103"]
[BlackElo "1262"]
[PlyCount "119"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 d6 5. Bc4 Nf6 6. Nf3 Nc6 7. Bb5 Qc7 8. Be3 a6 9. Bc4 b5 10. Bb3 Bb7 11. Rc1 Qd8 12. Nd5 Nxd5 13. exd5 Na5 14. 0-0 Rc8 15. Re1 Rxc1 16. Bxc1 g6 17. a4 Nxb3 18. Qxb3 Qa5 19. axb5 Qxb5 20. Qxb5+ axb5 21. Rd1 Bg7 22. Be3 b4 23. Nd4 Bxd5 24. Nf5 gxf5 25. Rxd5 Bxb2 26. Rb5 Kd7 27. Rxb4 Ra8 28. g4 Ba3 29. Rb7+ Ke6 30. gxf5+ Kf6 31. Kg2 Bc5 32. Kf3 Rc8 33. h4 h5 34. Bg5+ Kxf5 35. Rxe7 f6 36. Rf7 Bd4 37. Bf4 Be5 38. Be3 d5 39. Rd7 d4 40. Bxd4 Rc4 41. Bxe5 fxe5 42. Kg3 Rc8 43. Rd2 Rc3+ 44. f3 Ke6 45. Rd1 e4 46. Re1 Kf5 47. Rxe4 Rd3 48. Kf2 Rd5 49. Ke3 Re5 50. Kd4 Rxe4+ 51. fxe4+ Ke6 52. e5 Ke7 53. Ke4 Ke6 54. Kf4 Ke7 55. Kf5 Kf7 56. Kg5 Ke6 57. Kxh5 Kxe5 58. Kg6 Ke6 59. h5 Ke7 60. Kg7 1-0

[Event "NED-ch U13"]
[Site "Rijswijk"]
[Date "2011.06.02"]
[Round "2"]
[White "Schaap, Ricky"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1427"]
[BlackElo "1103"]
[PlyCount "49"]
[EventDate "2011.06.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 d6 5. c3 b6 6. b4 Bxf2+ 7. Kxf2 Bb7 8. Qb3 Qd7 9. Rf1 0-0-0 10. Bxf7 Rf8 11. Be6 Nf6 12. Bxd7+ Nxd7 13. Kg1 Rhg8 14. Ng5 Rxf1+ 15. Kxf1 Rf8+ 16. Kg1 h6 17. Ne6 Rf6 18. Nxg7 Ba8 19. Nf5 a5 20. Qg8+ Kb7 21. b5 Na7 22. Qg7 Kc8 23. Bxh6 Nxb5 24. Ne7+ Kd8 25. Bg5 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.23"]
[Round "8"]
[White "Koeman, Cas"]
[Black "Meijer, Joey"]
[Result "1-0"]
[ECO "C51"]
[WhiteElo "1072"]
[BlackElo "890"]
[PlyCount "53"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. 0-0 Nf6 7. d4 exd4 8. cxd4 Bb6 9. e5 Ng4 10. h3 d6 11. hxg4 Bxg4 12. Qb3 0-0 13. Bg5 Qd7 14. d5 dxe5 15. dxc6 bxc6 16. Nxe5 Qd4 17. Qc3 Qxc3 18. Nxc3 Bd4 19. Nxg4 Bxc3 20. Rac1 Bb2 21. Rc2 Bd4 22. Bb3 c5 23. Be7 Rfe8 24. Bxc5 Bxc5 25. Rxc5 Re4 26. Bd5 Rxg4 27. Bxa8 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.23"]
[Round "6"]
[White "Koeman, Cas"]
[Black "Sealy, Alec"]
[Result "0-1"]
[ECO "C51"]
[WhiteElo "1072"]
[BlackElo "1060"]
[PlyCount "90"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. 0-0 Nf6 7. d4 exd4 8. cxd4 Bb6 9. e5 Ng4 10. h3 Nh6 11. Bxh6 gxh6 12. Re1 Ba5 13. Re3 b6 14. d5 Nb4 15. e6 dxe6 16. Qd4 Rg8 17. Na3 Kf8 18. dxe6 Qxd4 19. Nxd4 fxe6 20. Nxe6+ Bxe6 21. Bxe6 Rg6 22. Rc1 Re8 23. Bf5 Rxe3 24. Bxg6 Rxa3 25. Bxh7 c5 26. Bb1 Nxa2 27. Bxa2 Rxa2 28. g4 Kg7 29. Rd1 Bc3 30. Rd7+ Kg6 31. Rd6+ Bf6 32. h4 Ra4 33. h5+ Kg5 34. f3 Ra1+ 35. Kg2 Ra2+ 36. Kh3 Rh2+ 37. Kxh2 Be5+ 38. Kg2 Bxd6 39. Kf2 a5 40. Ke2 c4 41. Kd2 a4 42. Kc2 a3 43. Kb1 c3 44. f4+ Bxf4 45. Ka2 c2 0-1

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.23"]
[Round "7"]
[White "Van Leeuwen, Louis"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "C48"]
[WhiteElo "906"]
[BlackElo "1072"]
[PlyCount "73"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Bc5 4. Bb5 Nf6 5. 0-0 0-0 6. d3 d5 7. h3 Qd6 8. Bxc6 bxc6 9. Bg5 dxe4 10. dxe4 Qe6 11. Qd2 Bb4 12. a3 Bxc3 13. Qxc3 Nxe4 14. Qd3 Nc5 15. Qc3 Ne4 16. Qd3 Nxg5 17. Nxg5 Qh6 18. Qd2 f6 19. Nf3 Qg6 20. Kh2 Ba6 21. Rfe1 Rad8 22. Qa5 Bb5 23. a4 Bc4 24. b3 Be6 25. Qxc7 Qxc2 26. Rac1 Qxb3 27. Rxc6 Qxa4 28. Rxe6 Qb3 29. Re7 Kh8 30. Rxg7 Qd3 31. Rd1 Rc8 32. Rxd3 Rxc7 33. Rxc7 e4 34. Rdd7 Re8 35. Rxh7+ Kg8 36. Rcg7+ Kf8 37. Rh8+ 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.23"]
[Round "9"]
[White "Van Maas de Bie, Jasper"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "C50"]
[WhiteElo "914"]
[BlackElo "1072"]
[PlyCount "86"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Nc3 Nf6 5. d3 d6 6. h3 a6 7. 0-0 0-0 8. Bg5 Be6 9. b3 b5 10. Nd5 bxc4 11. Nxf6+ gxf6 12. Bh6 Re8 13. bxc4 f5 14. exf5 Bxf5 15. Qd2 Bg6 16. Bg5 Qd7 17. Bf6 Qe6 18. Bg5 Nd4 19. Nxd4 Bxd4 20. Rae1 Rab8 21. c3 Bb6 22. d4 f6 23. Bh6 Rbd8 24. Qe3 Qxc4 25. dxe5 Bxe3 26. Rxe3 Rxe5 27. Rg3 Kf7 28. a3 Rde8 29. Re3 Rxe3 30. fxe3 Qxc3 31. Bg5 Bd3 32. Rf4 Rxe3 33. Bxf6 Qxf6 34. Rxf6+ Kxf6 35. Kf2 Re5 36. Kf3 c5 37. Kf4 c4 38. g4 c3 39. h4 c2 40. h5 c1Q+ 41. Kg3 Re3+ 42. Kf2 Qd2+ 43. Kg1 Re1# 0-1

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.22"]
[Round "3"]
[White "Hoeneveld, Maarten"]
[Black "Koeman, Cas"]
[Result "1-0"]
[ECO "C21"]
[WhiteElo "1140"]
[BlackElo "1072"]
[PlyCount "31"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Nxc3 Nc6 5. Bc4 Nf6 6. Bf4 Bb4 7. e5 Ne4 8. Qd5 0-0 9. Qxe4 Qe7 10. Nf3 d6 11. 0-0 Bd7 12. exd6 Qxe4 13. Nxe4 Rfe8 14. Neg5 h6 15. Bxf7+ Kf8 16. Bxe8 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.22"]
[Round "4"]
[White "Koeman, Cas"]
[Black "Nguyen, Lucas"]
[Result "0-1"]
[ECO "C25"]
[WhiteElo "1072"]
[BlackElo "900"]
[PlyCount "84"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. f4 exf4 3. Nf3 Nc6 4. Nc3 Be7 5. d4 Bh4+ 6. Ke2 Bg5 7. h4 Bh6 8. Kf2 Nf6 9. Bc4 0-0 10. Qd3 Ng4+ 11. Ke2 Re8 12. Kf1 Nb4 13. Qe2 c6 14. Bb3 d5 15. e5 Bf5 16. g3 fxg3 17. Bxh6 Nxh6 18. a3 Na6 19. Qg2 Ng4 20. Qxg3 Ne3+ 21. Kf2 Ng4+ 22. Ke2 Qd6 23. Kf1 Ne3+ 24. Kf2 Ng4+ 25. Qxg4 Bxg4 26. exd6 Re6 27. d7 Rf6 28. Rae1 Rxf3+ 29. Kg2 Nc7 30. Re7 Rd8 31. Rhe1 Kf8 32. Na4 Rf6 33. Nc5 b6 34. Nb7 Rxd7 35. Rxd7 Bxd7 36. a4 Bc8 37. Nd8 Rd6 38. Nxf7 Kxf7 39. Rf1+ Rf6 40. Re1 b5 41. axb5 Nxb5 42. c4 Nxd4 0-1

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.22"]
[Round "2"]
[White "Koeman, Cas"]
[Black "Zilverentant, Maarten"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1072"]
[BlackElo "713"]
[PlyCount "107"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Bc5 5. d3 0-0 6. Bg5 d6 7. Nd5 Bg4 8. Nxf6+ gxf6 9. Be3 Bxe3 10. fxe3 Bxf3 11. Qxf3 Nb4 12. 0-0-0 c6 13. Rdf1 b5 14. Bb3 c5 15. Qxf6 Qxf6 16. Rxf6 Kg7 17. Rhf1 Nc6 18. Rxf7+ Rxf7 19. Rxf7+ Kg6 20. Bd5 Rc8 21. Bxc6 Rxc6 22. Rxa7 Rc8 23. Ra5 b4 24. Rb5 Rf8 25. b3 Rf1+ 26. Kb2 Rf2 27. Rb6 Rf6 28. c3 bxc3+ 29. Kxc3 Kf7 30. Rb7+ Ke8 31. Rxh7 Rg6 32. h4 Rxg2 33. h5 Rh2 34. h6 Kd8 35. Rh8+ Ke7 36. h7 Kd7 37. a4 Kc7 38. d4 cxd4+ 39. exd4 exd4+ 40. Kxd4 Rh4 41. Ra8 Rxh7 42. Ra7+ Kc6 43. Rxh7 d5 44. exd5+ Kd6 45. Rh6+ Ke7 46. Ke5 Kf7 47. Ra6 Ke8 48. Ra7 Kd8 49. Kd6 Ke8 50. b4 Kf8 51. Ke6 Kg8 52. Kf6 Kh8 53. Kg6 Kg8 54. Ra8# 1-0

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.22"]
[Round "1"]
[White "Schoemaker, Nour Eddinne"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "C48"]
[WhiteElo "816"]
[BlackElo "1072"]
[PlyCount "103"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Nxe5 Nxb5 6. Nxb5 d6 7. Nf3 Nxe4 8. d4 c6 9. Qe2 d5 10. Nc3 Qe7 11. 0-0 Bg4 12. h3 Bh5 13. Re1 f5 14. Bg5 Bxf3 15. Bxe7 Bxe2 16. Bxf8 Rxf8 17. Rxe2 0-0-0 18. Nxe4 fxe4 19. Rae1 Rf6 20. c4 Rfd6 21. cxd5 cxd5 22. Rc2+ Kb8 23. f3 exf3 24. gxf3 Rg6+ 25. Kh2 a6 26. Rce2 Rf6 27. Rf1 Rdf8 28. Ref2 Rf4 29. Kg3 Rxd4 30. h4 Rd8 31. h5 g6 32. f4 Rd3+ 33. Kg2 Rg8 34. Rf3 Rxf3 35. Kxf3 gxh5 36. Ke2 Rf8 37. f5 h4 38. Ke3 Kc7 39. Kd4 Kd6 40. Rh1 Rxf5 41. Rxh4 Rf7 42. Kd3 Rd7 43. Kd4 Ke6 44. Rh6+ Kf5 45. Rh5+ Kg6 46. Rh1 h5 47. Rg1+ Kh6 48. Ke5 d4 49. Kf6 d3 50. Rg6+ Kh7 51. Kg5 Rg7 52. Kxh5 0-1

[Event "NED-ch U11"]
[Site "Waalwijk"]
[Date "2011.04.22"]
[Round "5"]
[White "Van der Ende, Jesse"]
[Black "Koeman, Cas"]
[Result "0-1"]
[ECO "C57"]
[WhiteElo "923"]
[BlackElo "1072"]
[PlyCount "122"]
[EventDate "2011.04.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. Ng5 d5 6. exd5 Nxd5 7. Qf3 Be6 8. Nc3 Nf6 9. Bxe6 fxe6 10. Nxe6 Qd7 11. Nxc5 Qd5 12. Nxb7 Qd7 13. Na5 e4 14. Nxe4 0-0 15. Nxf6+ Rxf6 16. Qxc6 Rxc6 17. Nxc6 Qxc6 18. Bf4 Re8+ 19. Be3 Qxc2 20. 0-0 Qxd3 21. Bxa7 Qc2 22. Bd4 Qe4 23. Bc3 Qc4 24. h3 Re6 25. a3 Rg6 26. Rad1 Qc6 27. f3 Qc5+ 28. Rf2 Re6 29. g4 Re2 30. Bd4 Qc2 31. Rxe2 Qxd1+ 32. Kf2 Qxd4+ 33. Kf1 Qc4 34. Kf2 Qd4+ 35. Kg3 Qd6+ 36. f4 Qd3+ 37. Kf2 Qxh3 38. g5 Qf5 39. Ke3 Qh3+ 40. Kd4 Qd7+ 41. Kc4 Qa4+ 42. Kc3 Qxf4 43. Re7 Qxg5 44. Rxc7 Qe5+ 45. Kb4 Qxc7 46. a4 Qb6+ 47. Ka3 Kf7 48. b4 Qe3+ 49. Kb2 Ke7 50. a5 Qa7 51. Kb3 Kd6 52. Ka4 Kc7 53. b5 Qd4+ 54. Kb3 Kb7 55. Ka3 g5 56. Kb3 g4 57. Ka3 g3 58. Kb3 g2 59. Ka3 g1Q 60. Ka2 Qga1+ 61. Kb3 Qdc3# 0-1

