[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.29"]
[Round "9"]
[White "De Boer, Sipke"]
[Black "Hofstra, Tijmen"]
[Result "0-1"]
[ECO "A07"]
[WhiteElo "1363"]
[BlackElo "1558"]
[PlyCount "58"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. g3 e5 2. Bg2 d5 3. d3 Nf6 4. Nf3 Nc6 5. 0-0 g6 6. Nbd2 Bg7 7. c4 d4 8. b3 0-0 9. Bb2 Nd7 10. a3 a5 11. Qb1 Qe7 12. Ne1 Ra6 13. Nc2 f5 14. e3 Nc5 15. Ne1 Bh6 16. exd4 Nxd4 17. Bxd4 exd4 18. Ndf3 Ne6 19. Nc2 c5 20. Re1 Bg7 21. Ng5 Qxg5 22. Bd5 Kh8 23. Bg2 Rd6 24. Re2 f4 25. Re4 fxg3 26. fxg3 Qd2 27. Qd1 Qf2+ 28. Kh1 Ng5 29. Qe2 Nxe4 0-1

[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.28"]
[Round "8"]
[White "Elgersma, Simon"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "2189"]
[BlackElo "1363"]
[PlyCount "93"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. Bc4 Nf6 5. d3 Bf5 6. Qe2 Nbd7 7. Bd2 c6 8. h3 e6 9. g4 Bg6 10. f4 Be7 11. Nf3 Qc7 12. 0-0-0 0-0-0 13. f5 exf5 14. Qxe7 fxg4 15. Nd4 Rhe8 16. Qa3 Nb6 17. Nb3 Nxc4 18. dxc4 a6 19. Nc5 h5 20. Rdf1 Rd4 21. Qb3 g3 22. Rhg1 h4 23. Rg2 Nh5 24. N3a4 Re7 25. Nb6+ Kd8 26. Be3 Nf4 27. Rd2 Rxd2 28. Bxf4 Rd6 29. Bxd6 Qxd6 30. Nxb7+ Rxb7 31. Rd1 Qxd1+ 32. Kxd1 c5 33. Ke2 Bxc2 34. Qxc2 Rxb6 35. Qd2+ Ke8 36. Kf1 Rf6+ 37. Kg1 Re6 38. b4 cxb4 39. Qxb4 f5 40. Qb8+ Kf7 41. Qb7+ Kf6 42. Qb2+ Kf7 43. c5 f4 44. Kg2 Rf6 45. Kf3 g5 46. c6 Ke7 47. Qxf6+ 1-0

[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.27"]
[Round "7"]
[White "Hartevelt, Leendert"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "E91"]
[WhiteElo "1777"]
[BlackElo "1363"]
[PlyCount "75"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 g6 2. c4 Bg7 3. d4 d6 4. Nc3 Nf6 5. Nf3 0-0 6. Be2 Bg4 7. Be3 Nbd7 8. 0-0 c5 9. d5 Nb6 10. Nd2 Bxe2 11. Qxe2 Qd7 12. h3 e6 13. g4 exd5 14. cxd5 h5 15. f3 Qe7 16. Rf2 Nbd7 17. Rg2 a6 18. Nf1 b5 19. Ng3 h4 20. Nf1 Nh7 21. Nd2 g5 22. Rf1 Bxc3 23. bxc3 f6 24. f4 Rab8 25. fxg5 fxg5 26. Rf5 a5 27. Rgf2 b4 28. cxb4 axb4 29. Nc4 Nb6 30. Qc2 Nxc4 31. Qxc4 Rbe8 32. e5 Rxf5 33. Rxf5 dxe5 34. d6+ Qe6 35. d7 Qxc4 36. dxe8Q+ Kg7 37. Qxe5+ Kg6 38. Qd5 1-0

[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.26"]
[Round "6"]
[White "De Boer, Sipke"]
[Black "Bootsma, Nick"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "1363"]
[BlackElo "1528"]
[PlyCount "91"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. 0-0 0-0 5. d4 d5 6. Bg5 Nc6 7. Nc3 Ne4 8. Bf4 a6 9. Rb1 Re8 10. Nxe4 dxe4 11. Nd2 Nxd4 12. Nxe4 Rb8 13. c3 Ne6 14. Be3 b6 15. Qxd8 Rxd8 16. Rfd1 Bb7 17. Rxd8+ Nxd8 18. Rd1 Ne6 19. Rd2 h6 20. f4 f5 21. Nf2 Bxg2 22. Kxg2 Rd8 23. Rxd8+ Nxd8 24. g4 Nc6 25. gxf5 gxf5 26. Nd3 Kf7 27. Kf3 e5 28. fxe5 Nxe5+ 29. Nxe5+ Bxe5 30. Bf4 Ke6 31. Bxe5 Kxe5 32. e3 c6 33. b4 h5 34. c4 h4 35. h3 a5 36. b5 cxb5 37. cxb5 a4 38. a3 Ke6 39. Kf4 Kf6 40. e4 fxe4 41. Kxe4 Ke6 42. Kf4 Kf6 43. Kg4 Kg7 44. Kxh4 Kh6 45. Kg4 Kg6 46. Kf4 1-0

[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.25"]
[Round "4"]
[White "Bosma, Jan"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "D76"]
[WhiteElo "1684"]
[BlackElo "1363"]
[PlyCount "101"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nf3 0-0 5. 0-0 Nc6 6. d4 d5 7. cxd5 Nxd5 8. Nc3 Nb6 9. e3 Bf5 10. a3 Qc8 11. Qe2 Bh3 12. Rd1 Bxg2 13. Kxg2 Rd8 14. Bd2 e5 15. dxe5 Nxe5 16. Nxe5 Bxe5 17. e4 Qe6 18. Bg5 Re8 19. f3 Bxc3 20. bxc3 Qe5 21. Qd2 f5 22. Bf4 Qe7 23. exf5 gxf5 24. Re1 Qf7 25. Be5 c6 26. Qg5+ Qg6 27. Qf4 Re6 28. Qd4 Rae8 29. f4 Qf7 30. Rad1 R6e7 31. Qf2 Nc4 32. Bd4 Nxa3 33. Rxe7 Qxe7 34. Bxa7 Nb5 35. Bd4 Nxd4 36. Rxd4 Qe2 37. Rd7 b5 38. Rc7 Qxf2+ 39. Kxf2 Re6 40. Kf3 h6 41. g4 fxg4+ 42. Kxg4 Kf8 43. Kf5 Rd6 44. Ke5 Rd5+ 45. Ke6 Rc5 46. f5 Rxc3 47. Rc8+ Kg7 48. f6+ Kg6 49. Rg8+ Kh7 50. f7 Re3+ 51. Kd6 1-0

[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.24"]
[Round "3"]
[White "De Boer, Sipke"]
[Black "Nieczyporowski, Miki"]
[Result "0-1"]
[ECO "D82"]
[WhiteElo "1363"]
[BlackElo "1616"]
[PlyCount "22"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 c5 6. e3 Nc6 7. Be2 cxd4 8. Nxd4 0-0 9. cxd5 Nxd4 10. Qxd4 Nxd5 11. Qxd5 Bxc3+ 0-1

[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.24"]
[Round "2"]
[White "Van Doren, Bas"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "1755"]
[BlackElo "1363"]
[PlyCount "61"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Bd2 c6 6. h3 Bf5 7. Nf3 Nbd7 8. Bc4 e6 9. a3 h6 10. 0-0 Qc7 11. Re1 Bd6 12. b4 0-0 13. Bb3 a5 14. b5 cxb5 15. Nxb5 Qb6 16. a4 Ne8 17. Nh4 Bh7 18. Be3 Qc6 19. d5 exd5 20. Bxd5 Qxc2 21. Qf3 Ne5 22. Qg3 Nd3 23. Nxd6 Nxe1 24. Nxe8 Rfxe8 25. Bd4 g5 26. Qd6 Ra6 27. Qd7 Rf8 28. Rxe1 gxh4 29. Bxf7+ Rxf7 30. Re8+ Rf8 31. Qg7# 1-0

[Event "NED-ch U18/20"]
[Site "Assen"]
[Date "2017.04.23"]
[Round "1"]
[White "De Boer, Sipke"]
[Black "De Boer, Bas"]
[Result "0-1"]
[ECO "A37"]
[WhiteElo "1363"]
[BlackElo "2107"]
[PlyCount "66"]
[EventDate "2017.04.23"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. g3 c5 2. Bg2 Nc6 3. Nf3 g6 4. 0-0 Bg7 5. c4 e6 6. Nc3 Nge7 7. d3 0-0 8. a3 d5 9. cxd5 exd5 10. e3 h6 11. d4 cxd4 12. Nxd4 Nxd4 13. exd4 Be6 14. Be3 Nf5 15. Qd2 Qd7 16. Rac1 Rac8 17. Rc2 Rfe8 18. Ne2 Rxc2 19. Qxc2 Nxe3 20. fxe3 Bg4 21. Nc3 Rxe3 22. Nxd5 Re2 23. Qc5 b6 24. Qc4 Rxg2+ 25. Kxg2 Be6 26. Kg1 Bxd5 27. Qd3 Bc6 28. Rd1 Qd5 29. Rd2 Qh1+ 30. Kf2 Qxh2+ 31. Ke1 Qg1+ 32. Ke2 Bd7 33. Kf3 h5 0-1

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.05.07"]
[Round "9"]
[White "Kanters, Cor"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "E05"]
[WhiteElo "1760"]
[BlackElo "1442"]
[PlyCount "117"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Nc6 5. Bg2 Be7 6. 0-0 0-0 7. Nc3 dxc4 8. e3 Na5 9. Qe2 Rb8 10. a4 Ne8 11. Rd1 c6 12. Ne4 b5 13. Bd2 Nb3 14. Ra2 Nxd2 15. Nexd2 Qc7 16. Ne5 Bd7 17. axb5 cxb5 18. Rda1 Nf6 19. Rxa7 Qd8 20. Ne4 Be8 21. Nc5 Bxc5 22. dxc5 Qc8 23. c6 Nd5 24. Nd7 Bxd7 25. cxd7 Qc5 26. Qh5 g6 27. Qe5 Qb4 28. Bxd5 exd5 29. Rc7 Rfd8 30. Raa7 Qf8 31. Qxd5 Qe7 32. Qc5 Qxc5 33. Rxc5 Kf8 34. Re5 Rb6 35. Kg2 Rd6 36. Rxb5 R6xd7 37. Ra3 Rd3 38. Ra4 c3 39. bxc3 Rxc3 40. Ra7 Rc6 41. Rbb7 Rf6 42. g4 g5 43. Rd7 Rb8 44. Kg3 Rb2 45. f3 Rb3 46. Ra8+ Kg7 47. Re8 Ra3 48. Rd5 Rb3 49. Rxg5+ Rg6 50. Rd5 Rgb6 51. Rdd8 h6 52. h4 Kf6 53. Rh8 Ke7 54. Rde8+ Kd7 55. Re4 R3b5 56. Rf4 Ke7 57. Rh7 Rf6 58. Rxf6 Kxf6 59. Rxh6+ 1-0

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.05.06"]
[Round "8"]
[White "De Boer, Sipke"]
[Black "Nguyen, Sang"]
[Result "0-1"]
[ECO "D37"]
[WhiteElo "1442"]
[BlackElo "1832"]
[PlyCount "82"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bf4 Nbd7 6. e3 Qa5 7. a3 Ne4 8. Qa4 Qxa4 9. Nxa4 dxc4 10. Nc3 Nxc3 11. bxc3 b5 12. Be2 Nb6 13. 0-0 Nd5 14. Rfc1 Nxf4 15. exf4 Bd6 16. g3 0-0 17. Ne5 Bxe5 18. fxe5 Bb7 19. Rcb1 Rab8 20. Rb4 Rfc8 21. Rab1 Rc7 22. a4 a6 23. f4 f6 24. Kf2 Kf7 25. Ke3 Ke7 26. h4 fxe5 27. fxe5 c5 28. dxc5 Rxc5 29. axb5 Rxe5+ 30. Kf2 Rf8+ 31. Ke1 Bf3 32. R1b2 Bxe2 33. Rxe2 Rxb5 34. Rxc4 Kd6 35. Rd4+ Rd5 36. Rb4 Rb5 37. Rd4+ Ke7 38. Red2 Rf3 39. R2d3 Re5+ 40. Kd2 Rxd3+ 41. Kxd3 Rd5 0-1

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.05.05"]
[Round "7"]
[White "De Boer, Sipke"]
[Black "Van der Noordaa, Daan"]
[Result "1/2-1/2"]
[ECO "A52"]
[WhiteElo "1442"]
[BlackElo "1335"]
[PlyCount "84"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 Nxe5 5. Nf3 Nbc6 6. Be2 Bb4+ 7. Bd2 Bxd2+ 8. Nbxd2 d6 9. 0-0 0-0 10. Nxe5 Nxe5 11. Nf3 Qf6 12. Qc2 Be6 13. Rad1 Rfd8 14. Rd2 h6 15. Rfd1 Rd7 16. Nxe5 Qxe5 17. c5 d5 18. exd5 Rxd5 19. a3 Rad8 20. Rxd5 Rxd5 21. Rxd5 Bxd5 22. h3 Qg5 23. f3 Be6 24. Kf2 Qh4+ 25. Kf1 Qg3 26. Qe4 c6 27. Qd4 Qg5 28. Bd3 g6 29. Qc3 Qd8 30. b4 b5 31. cxb6 axb6 32. Be4 Qd1+ 33. Kf2 Bd5 34. Qd3 Qxd3 35. Bxd3 Kg7 36. Ke3 b5 37. Be4 Bxe4 38. Kxe4 Kf6 39. f4 Ke6 40. g4 f5+ 41. gxf5+ gxf5+ 42. Ke3 Ke7 1/2-1/2

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.05.04"]
[Round "6"]
[White "Ten Have, Dimitri"]
[Black "De Boer, Sipke"]
[Result "1/2-1/2"]
[ECO "D06"]
[WhiteElo "1365"]
[BlackElo "1442"]
[PlyCount "130"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. d4 d5 2. c4 c5 3. cxd5 Qxd5 4. Nf3 cxd4 5. Nc3 Qd8 6. Qxd4 Qxd4 7. Nxd4 e5 8. Ndb5 Na6 9. Bd2 Be6 10. 0-0-0 Bc5 11. e4 Bxf2 12. Nd6+ Ke7 13. Nxb7 Nc7 14. Na5 f6 15. Bc4 Kf7 16. Bxe6+ Nxe6 17. Rhf1 Bd4 18. Nc4 Ne7 19. Nd6+ Kg8 20. Rf3 h6 21. Rdf1 Kh7 22. Ncb5 Rhd8 23. Bc3 Ng5 24. Rg3 Bxc3 25. Rxc3 a6 26. Nc7 Ra7 27. Rd1 Nc8 28. Nxc8 Rxc8 29. Nd5 Rxc3+ 30. Nxc3 Rc7 31. Kd2 Kg6 32. Ke3 Rc6 33. Rd7 Rb6 34. h4 Ne6 35. Na4 Rb4 36. b3 Rb5 37. Rd6 Nc7 38. Rc6 Rb7 39. Nc5 Ra7 40. g4 Kf7 41. Kd3 g6 42. Nd7 Ne6 43. Nc5 Nxc5+ 44. Rxc5 h5 45. gxh5 gxh5 46. Rc4 Rd7+ 47. Ke2 Rd6 48. a4 Kg6 49. b4 f5 50. b5 axb5 51. axb5 Rd8 52. exf5+ Kxf5 53. Rb4 Rb8 54. b6 Ke6 55. Ke3 Kd5 56. b7 Kc6 57. Ke4 Rxb7 58. Rxb7 Kxb7 59. Kxe5 Kc6 60. Kf5 Kd5 61. Kg5 Ke5 62. Kxh5 Kf5 63. Kh6 Kf6 64. Kh7 Kf7 65. h5 Kf6 1/2-1/2

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.05.03"]
[Round "5"]
[White "De Boer, Sipke"]
[Black "Van Nimwegen, Martijn"]
[Result "0-1"]
[ECO "E61"]
[WhiteElo "1442"]
[BlackElo "1491"]
[PlyCount "58"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 0-0 5. e3 d6 6. Bd3 Nbd7 7. 0-0 c5 8. Bd2 a6 9. Re1 Rb8 10. Qc1 Re8 11. Rb1 b6 12. b4 Bb7 13. Be2 Ba8 14. Qa3 Qc8 15. bxc5 dxc5 16. d5 e6 17. e4 exd5 18. exd5 Bb7 19. Bf4 Ra8 20. Na4 Qd8 21. Qb3 b5 22. cxb5 Bxd5 23. Qc2 Be4 24. Bd3 Bxd3 25. Rxe8+ Qxe8 26. Qxd3 axb5 27. Qxb5 Qe4 28. Nxc5 Nxc5 29. Qxc5 Qxb1+ 0-1

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.05.02"]
[Round "4"]
[White "Baselmans, Luuk"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "C41"]
[WhiteElo "1762"]
[BlackElo "1442"]
[PlyCount "91"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 Be7 5. dxe5 Nxe5 6. Nxe5 dxe5 7. Qh5 g6 8. Qxe5 Nf6 9. Bh6 Qd6 10. Qxd6 cxd6 11. Nc3 Be6 12. Bb5+ Bd7 13. Bxd7+ Kxd7 14. f3 Rhc8 15. 0-0-0 Rc4 16. Nd5 Rac8 17. c3 Nxd5 18. Rxd5 R8c5 19. Rhd1 Rxd5 20. Rxd5 Rc5 21. Rxc5 dxc5 22. Bf4 c4 23. Be3 a6 24. Kd2 Bf6 25. g3 b5 26. Bd4 Be7 27. Ke3 Bd6 28. e5 Bc7 29. Ke4 Ke6 30. f4 h5 31. h3 Bd8 32. g4 hxg4 33. hxg4 Be7 34. f5+ gxf5+ 35. gxf5+ Kd7 36. Kd5 Bg5 37. e6+ fxe6+ 38. fxe6+ Kc7 39. Be5+ Kb6 40. Bd6 Ka5 41. e7 Bxe7 42. Bxe7 Ka4 43. Bb4 a5 44. Be7 b4 45. Kxc4 bxc3 46. b3# 1-0

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.04.30"]
[Round "2"]
[White "De Boer, Sipke"]
[Black "Bosma, Jan"]
[Result "0-1"]
[ECO "E35"]
[WhiteElo "1442"]
[BlackElo "1556"]
[PlyCount "116"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 e6 3. c4 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. e3 0-0 7. Bd3 d5 8. cxd5 exd5 9. Qc2 h6 10. Bh4 Nbd7 11. 0-0 Be7 12. Rac1 Ne8 13. Bxe7 Qxe7 14. Ne2 Nd6 15. Qb3 c5 16. Bb5 Nxb5 17. Qxb5 c4 18. Nf4 Qd6 19. Qa4 a5 20. Nd2 b5 21. Qd1 b4 22. Nb1 Nf6 23. Re1 Ne4 24. f3 Ng5 25. a3 Ne6 26. Nh3 f5 27. g3 g5 28. f4 gxf4 29. Nxf4 Nxf4 30. gxf4 Kh7 31. Kf2 Rg8 32. Qh5 Qg6 33. Qxg6+ Rxg6 34. Rg1 Rag8 35. Rxg6 Rxg6 36. Rg1 Rxg1 37. Kxg1 Bc6 38. Kf2 Ba4 39. axb4 axb4 40. Ke2 Bc2 41. Nd2 Kg6 42. Kf2 Kh5 43. Kg3 c3 44. bxc3 bxc3 45. Nf3 Be4 46. Ne1 c2 47. Nxc2 Bxc2 48. Kh3 Bd1 49. Kg3 Bg4 50. h3 Bd1 51. Kf2 Kh4 52. Kg2 Bc2 53. Kh2 Be4 54. Kg1 Kxh3 55. Kf2 Kg4 56. Kg1 h5 57. Kh2 h4 58. Kg1 Kg3 0-1

[Event "NED-ch U16"]
[Site "Rotterdam"]
[Date "2016.04.29"]
[Round "1"]
[White "Pols, Arne"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "C54"]
[WhiteElo "1904"]
[BlackElo "1442"]
[PlyCount "71"]
[EventDate "2016.04.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. c3 0-0 6. b4 Bd6 7. Nbd2 b6 8. Bb3 Bb7 9. Nc4 h6 10. 0-0 Rc8 11. b5 Na5 12. Nfxe5 Bxe5 13. Nxe5 Nxb3 14. axb3 Ra8 15. f3 a5 16. bxa6 Rxa6 17. Bb2 Qa8 18. Qc2 Qa7 19. Rxa6 Bxa6 20. Kh1 Ra8 21. g3 Qb7 22. c4 d6 23. Ng4 Nxg4 24. fxg4 b5 25. Qc3 f6 26. h4 bxc4 27. bxc4 Rb8 28. Ba1 Qb3 29. Qd2 c6 30. g5 hxg5 31. hxg5 fxg5 32. Qxg5 Qb7 33. Qg4 d5 34. Kg2 dxc4 35. Rb1 Bb5 36. dxc4 1-0

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.09"]
[Round "9"]
[White "De Boer, Sipke"]
[Black "Van Stiphout, Sophie"]
[Result "0-1"]
[ECO "D35"]
[PlyCount "44"]
[EventDate "2015.05.02"]
[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 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. cxd5 exd5 6. e4 dxe4 7. Nxe4 Qe7 8. Qe2 Qxe4 9. Nf3 Bb4+ 10. Kd1 Qxe2+ 11. Bxe2 Ne4 12. Be3 Nb6 13. a3 Be7 14. Rc1 Nd5 15. Rf1 Bd7 16. Bc4 Nb6 17. Bd3 f5 18. Bf4 c5 19. Be5 Rg8 20. Ke2 c4 21. Bxe4 fxe4 22. Nd2 Bb5 0-1

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.08"]
[Round "8"]
[White "De Boer, Sipke"]
[Black "Kanbier, Max"]
[Result "1/2-1/2"]
[ECO "D10"]
[PlyCount "76"]
[EventDate "2015.05.02"]
[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. Bg5 h6 5. Bxf6 exf6 6. cxd5 Bb4 7. dxc6 bxc6 8. Nf3 0-0 9. e3 Qa5 10. Qc2 Na6 11. Bd3 Nc7 12. 0-0 Bg4 13. Be4 Nd5 14. Bxd5 cxd5 15. a3 Bxc3 16. Qxc3 Qb6 17. Ne1 Be2 18. b4 Rac8 19. Qb2 Bxf1 20. Kxf1 Rc4 21. Rc1 Rfc8 22. Rxc4 Rxc4 23. Nd3 Qb5 24. Qb3 a5 25. Ke1 axb4 26. axb4 Qc6 27. Kd2 Qb7 28. g3 g5 29. Qb1 Qa6 30. Qb2 Qa4 31. Qb1 Qa3 32. Kd1 Qc3 33. Ke2 Kf8 34. b5 Rc8 35. b6 Rb8 36. b7 Qc7 37. Nc5 Ke7 38. Qd3 Rxb7 1/2-1/2

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.07"]
[Round "7"]
[White "Mesman, Edwyn"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "C56"]
[WhiteElo "1839"]
[PlyCount "45"]
[EventDate "2015.05.02"]
[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. Bc4 Nf6 5. e5 Qe7 6. 0-0 Ng4 7. Re1 b6 8. h3 Nh6 9. Bg5 Qb4 10. Nbd2 Qxb2 11. Ne4 Be7 12. Rb1 Qa3 13. Rb3 Qa4 14. Bb5 Qxa2 15. Bxc6 dxc6 16. Bxh6 gxh6 17. Nxd4 Be6 18. Nxe6 fxe6 19. Qh5+ Kd7 20. Qf7 Raf8 21. Rd1+ Kc8 22. Qxe6+ Kb7 23. Rxb6+ 1-0

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.06"]
[Round "6"]
[White "Nguyen, Sang"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "1803"]
[PlyCount "37"]
[EventDate "2015.05.02"]
[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. Nf3 Nf6 3. Bf4 Nc6 4. e3 Bg4 5. Nbd2 e6 6. h3 Bh5 7. Be2 Bd6 8. Bxd6 Qxd6 9. c4 b6 10. Rc1 0-0 11. 0-0 e5 12. dxe5 Nxe5 13. Nxe5 Bxe2 14. Nxf7 Rxf7 15. Qxe2 d4 16. exd4 Qxd4 17. Nf3 Qf4 18. Qd2 Qe4 19. Ng5 1-0

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.05"]
[Round "5"]
[White "De Boer, Sipke"]
[Black "Elgersma, Simon"]
[Result "0-1"]
[ECO "E90"]
[BlackElo "1935"]
[PlyCount "100"]
[EventDate "2015.05.02"]
[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. Nc3 Bg7 4. e4 d6 5. Nf3 0-0 6. Bd3 e5 7. d5 Nh5 8. Bg5 Qe8 9. Qd2 f5 10. Bh6 fxe4 11. Bxe4 Nf4 12. Bxg7 Kxg7 13. g3 Nh5 14. h3 Na6 15. 0-0-0 Nc5 16. Qe3 Qf7 17. g4 Nxe4 18. Nxe4 Qxf3 19. gxh5 Qxh5 20. Rdg1 Rf3 21. Qe2 Qf5 22. Rg5 Qf4+ 23. Kd1 Bf5 24. Ng3 Rd3+ 25. Qxd3 Qxg5 26. Nxf5+ Qxf5 27. Qxf5 gxf5 28. Rg1+ Kf7 29. Ke2 Rg8 30. Rd1 Kf6 31. Kf3 h5 32. b4 h4 33. a4 e4+ 34. Ke3 Ke5 35. f4+ exf3 36. Kxf3 Rg3+ 37. Kf2 Rxh3 38. Re1+ Kf4 39. Re7 Rh2+ 40. Kg1 Rb2 41. b5 Rb4 42. Rxc7 Rxa4 43. Rxb7 Rxc4 44. Rxa7 Rc5 45. b6 Rxd5 46. Rb7 Rb5 47. Rb8 Kg3 48. Rg8+ Kf3 49. Rb8 f4 50. b7 d5 0-1

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.04"]
[Round "4"]
[White "Hofstra, Tijmen"]
[Black "De Boer, Sipke"]
[Result "0-1"]
[ECO "C65"]
[PlyCount "50"]
[EventDate "2015.05.02"]
[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. Nc3 Nf6 4. Bb5 d6 5. d3 Bg4 6. h3 Be6 7. Be3 Be7 8. 0-0 0-0 9. d4 exd4 10. Nxd4 Nxd4 11. Bxd4 a6 12. Be2 c5 13. Be3 b5 14. Bf3 Rc8 15. Qe2 Bc4 16. Qe1 Bxf1 17. Qxf1 Re8 18. Rd1 Qb6 19. b4 Bf8 20. Rb1 Qc7 21. bxc5 dxc5 22. g3 Qe5 23. Ne2 Nxe4 24. Qg2 Nc3 25. Bf4 Nxe2+ 0-1

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.03"]
[Round "3"]
[White "De Boer, Sipke"]
[Black "Steenstra, Jelmer"]
[Result "1/2-1/2"]
[ECO "D10"]
[PlyCount "70"]
[EventDate "2015.05.02"]
[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. Bg5 dxc4 5. e4 b5 6. Bxf6 exf6 7. a4 Bb4 8. Nf3 0-0 9. Be2 Re8 10. Nd2 Bxc3 11. bxc3 Bb7 12. 0-0 Nd7 13. Qb1 a6 14. Bxc4 Rb8 15. Bd3 g6 16. c4 bxc4 17. Bxc4 c5 18. Qb3 Re7 19. d5 Bxd5 20. Qd3 Bxc4 21. Qxc4 a5 22. f3 Qc7 23. Rfb1 Ree8 24. Rb5 Rxb5 25. Qxb5 Rb8 26. Qc4 Qe5 27. Rb1 Rxb1+ 28. Nxb1 Qd4+ 29. Qxd4 cxd4 30. Nd2 Nc5 31. Nc4 Nxa4 32. Nxa5 Nc5 33. Kf2 Kf8 34. Ke2 Ke7 35. Nc6+ Kd6 1/2-1/2

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.03"]
[Round "2"]
[White "Mensing, Adrian"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "C44"]
[WhiteElo "1900"]
[PlyCount "47"]
[EventDate "2015.05.02"]
[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. c3 Bc5 4. d4 Bd6 5. Bd3 Nf6 6. dxe5 Nxe5 7. Nxe5 Bxe5 8. f4 Bd6 9. e5 Qe7 10. Qe2 0-0 11. exf6 Qxf6 12. 0-0 Bc5+ 13. Kh1 d5 14. Nd2 Bf5 15. Nb3 Bb6 16. Qc2 Bxd3 17. Qxd3 Rad8 18. Be3 Bxe3 19. Qxe3 b6 20. Rae1 Qc6 21. Nd4 Qd7 22. Qe7 Qc8 23. Re5 Rfe8 24. Nc6 1-0

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2015.05.02"]
[Round "1"]
[White "De Boer, Sipke"]
[Black "Van Hoorn, Geert"]
[Result "0-1"]
[ECO "A57"]
[PlyCount "68"]
[EventDate "2015.05.02"]
[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 c5 3. d5 b5 4. b3 d6 5. Bg5 Ne4 6. Nf3 g6 7. Nbd2 Nc3 8. Qc2 Bg7 9. Rc1 Qa5 10. cxb5 Bf5 11. Qb2 0-0 12. Bh6 Bf6 13. Nc4 Nxa2+ 14. Nxa5 Bxb2 15. Bxf8 Kxf8 16. Rc4 Bc3+ 17. Rxc3 Nxc3 18. Nc6 Nxd5 19. Nd2 Nxc6 20. bxc6 Nb4 21. e4 Be6 22. Bb5 Rc8 23. Ke2 Nxc6 24. Ra1 Nd4+ 25. Kd3 Nxb5 26. Ra5 Nd4 27. Rxa7 Nxb3 28. Nxb3 Bxb3 29. Rb7 Be6 30. f3 f5 31. Kc3 Kf7 32. Kd3 Ra8 33. Rb2 Ra3+ 34. Kd2 Ra2 0-1

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.10"]
[Round "9"]
[White "De Boer, Sipke"]
[Black "Linssen, Martijn"]
[Result "0-1"]
[ECO "D50"]
[WhiteElo "955"]
[BlackElo "659"]
[PlyCount "122"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Bg5 e6 5. cxd5 cxd5 6. Bxf6 Qxf6 7. e4 Bb4 8. e5 Bxc3+ 9. bxc3 Qe7 10. Nf3 Qa3 11. Qb3 Qxb3 12. axb3 Nc6 13. Bb5 Bd7 14. Bxc6 Bxc6 15. Ra3 0-0 16. Kd2 Rfc8 17. Rha1 a6 18. Ne1 Bb5 19. Nd3 b6 20. b4 Rc7 21. Nb2 Rca7 22. Na4 Rb8 23. f4 a5 24. g4 axb4 25. cxb4 Rba8 26. Kc3 Rxa4 27. Rxa4 Rxa4 28. Rxa4 Bxa4 29. f5 Bd7 30. fxe6 Bxe6 31. g5 h6 32. h4 hxg5 33. hxg5 Kh7 34. Kd3 Kg6 35. Ke3 Kxg5 36. Kf3 Kf5 37. Ke3 g5 38. Kf3 g4+ 39. Kg3 Ke4 40. Kf2 Kxd4 41. Ke2 Kxe5 42. Ke3 f5 43. b5 f4+ 44. Kf2 Ke4 45. Ke2 d4 46. Kf2 d3 47. Ke1 g3 48. Kf1 Bh3+ 49. Ke1 Ke3 50. Kd1 g2 51. Kc1 g1Q+ 52. Kb2 f3 53. Kc3 f2 54. Kc4 f1Q 55. Kd5 d2 56. Kc6 d1Q 57. Kxb6 Kd3+ 58. Ka6 Qf6+ 59. Ka5 Qfb6+ 60. Kb4 Qgd4+ 61. Ka3 Qa5# 0-1

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.09"]
[Round "7"]
[White "De Boer, Sipke"]
[Black "Beukema, Christiaan"]
[Result "0-1"]
[ECO "D35"]
[WhiteElo "955"]
[BlackElo "1311"]
[PlyCount "54"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. cxd5 exd5 6. Nxd5 Nxd5 7. Bxd8 Bb4+ 8. Qd2 Bxd2+ 9. Kxd2 Kxd8 10. e4 N5b6 11. Nf3 c5 12. Rc1 cxd4 13. Nxd4 Re8 14. f3 Ne5 15. b3 Re7 16. a4 Be6 17. a5 Nbd7 18. b4 Nf6 19. a6 b6 20. f4 Rd7 21. fxe5 Rxd4+ 22. Ke3 Rxe4+ 23. Kf3 Rxe5 24. g3 Bd5+ 25. Kf4 Re4+ 26. Kf5 Be6+ 27. Kg5 Rg4# 0-1

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.09"]
[Round "8"]
[White "Van Harten, Lucas"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "C30"]
[WhiteElo "1118"]
[BlackElo "955"]
[PlyCount "11"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 e5 2. f4 f5 3. Bc4 fxe4 4. Qh5+ g6 5. Qxe5+ Qe7 6. Qxh8 1-0

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.08"]
[Round "6"]
[White "Boekhoudt, Nicolien"]
[Black "De Boer, Sipke"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "801"]
[BlackElo "955"]
[PlyCount "47"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[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. Bc4 Nf6 4. d3 Bc5 5. Nc3 d6 6. h3 0-0 7. Bg5 Be6 8. Qd2 Bxc4 9. dxc4 Nd4 10. Nd5 Nxf3+ 11. gxf3 Kh8 12. Nxf6 gxf6 13. Bh4 Rg8 14. 0-0-0 Qe7 15. f4 Qe6 16. f5 Qe8 17. Bxf6+ Rg7 18. Qg5 Qf8 19. Rdg1 Kg8 20. Bxg7 f6 21. Qg4 Qc8 22. Bxf6+ Kf7 23. Qg7+ Ke8 24. Qe7# 1-0

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.07"]
[Round "5"]
[White "De Boer, Sipke"]
[Black "Groot Kormelink, Welmoed"]
[Result "1-0"]
[ECO "D50"]
[WhiteElo "955"]
[BlackElo "724"]
[PlyCount "109"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Bg5 e6 5. Bxf6 Qxf6 6. cxd5 cxd5 7. e4 Bb4 8. Qe2 Qxd4 9. Qd3 Nc6 10. Qxd4 Nxd4 11. Rd1 Nb5 12. Bxb5+ Bd7 13. Bxd7+ Kxd7 14. exd5 Rhe8 15. dxe6+ Kxe6 16. a3 Kf6+ 17. Kf1 Bxc3 18. bxc3 Red8 19. Rb1 b6 20. Nf3 Rd3 21. Rc1 Rad8 22. g3 Rxf3 23. Kg2 Rdd3 24. Rc2 Rxc3 25. Rxc3 Rxc3 26. Ra1 Ke5 27. Kf1 Kd4 28. Ke2 Kc4 29. Kd2 a5 30. Rb1 Rxa3 31. Rxb6 Rb3 32. Ra6 Rb2+ 33. Ke3 Ra2 34. Ra7 a4 35. Rxf7 a3 36. Rxg7 Rb2 37. Rxh7 a2 38. Ra7 Kb3 39. g4 Rb1 40. Kf4 a1Q 41. Rxa1 Rxa1 42. h4 Ra6 43. Kg5 Kc4 44. f4 Kd4 45. f5 Ke5 46. h5 Ra8 47. h6 Rg8+ 48. Kh5 Kf6 49. h7 Rh8 50. Kh6 Ke5 51. Kg7 Re8 52. h8Q Rxh8 53. Kxh8 Kf6 54. Kh7 Kf7 55. g5 1-0

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.07"]
[Round "4"]
[White "Schelleman, Niels"]
[Black "De Boer, Sipke"]
[Result "1/2-1/2"]
[ECO "C55"]
[WhiteElo "1125"]
[BlackElo "955"]
[PlyCount "147"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[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. Bc4 Nf6 4. d4 Nxe4 5. 0-0 d5 6. Bb5 exd4 7. Nxd4 Bd7 8. Nxc6 Bxc6 9. Bxc6+ bxc6 10. Re1 Be7 11. Qe2 0-0 12. Be3 Bf6 13. c3 Re8 14. Nd2 Ng5 15. Qg4 Ne4 16. Re2 Qc8 17. Qf3 Qd7 18. Rae1 Nxd2 19. Bxd2 Rxe2 20. Qxe2 c5 21. Bf4 d4 22. cxd4 cxd4 23. Rd1 Rd8 24. Qf3 d3 25. b3 c6 26. g3 Qd5 27. Qe3 Bc3 28. Bc7 Rc8 29. Rxd3 Qh5 30. Bf4 Bf6 31. Qf3 Qxf3 32. Rxf3 c5 33. Re3 h6 34. Re4 Bg5 35. Bxg5 hxg5 36. Ra4 Rc7 37. Kg2 f5 38. Kf3 Kf7 39. h4 gxh4 40. gxh4 Kf6 41. Kf4 g6 42. Ra6+ Kg7 43. Kg5 c4 44. Rxg6+ Kh7 45. bxc4 Rxc4 46. f4 Rc2 47. Ra6 Rg2+ 48. Kxf5 Rg7 49. Ke4 Kg8 50. h5 Rh7 51. h6 Rf7 52. f5 Kh7 53. Rg6 Re7+ 54. Kf4 Re2 55. Ra6 Rf2+ 56. Kg5 Rg2+ 57. Kf6 Kxh6 58. Rxa7 Rb2 59. Ra6 Kh5 60. Ke6 Re2+ 61. Kf7 Rb2 62. Ra7 Rb6 63. Ra5 Rb7+ 64. Ke6 Rb6+ 65. Ke5 Kg5 66. Rd5 Ra6 67. Rd6 Ra5+ 68. Rd5 Rxa2 69. Ke6 Re2+ 70. Re5 Rf2 71. f6+ Kg6 72. f7 Rxf7 73. Re4 Rf6+ 74. Ke5 1/2-1/2

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.06"]
[Round "3"]
[White "De Boer, Sipke"]
[Black "Guendisch, Stefan"]
[Result "0-1"]
[ECO "D20"]
[WhiteElo "955"]
[BlackElo "1293"]
[PlyCount "134"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. e4 e6 4. Nc3 Bb4 5. Bxc4 Bxc3+ 6. bxc3 Nd7 7. Nf3 Nb6 8. Bb3 Ne7 9. Bg5 0-0 10. d5 exd5 11. exd5 Qd6 12. 0-0 Bg4 13. h3 Bxf3 14. Qxf3 Nexd5 15. Rad1 Qg6 16. Bxd5 Qxg5 17. Bxb7 Rad8 18. Rxd8 Rxd8 19. Rd1 Rxd1+ 20. Qxd1 g6 21. Qd3 Kg7 22. Qd4+ Qf6 23. Qc5 Qe6 24. a3 Qd7 25. Bc6 Qd6 26. Qxd6 cxd6 27. Kf1 Kf6 28. Ke2 Ke5 29. Kd3 d5 30. Be8 f6 31. g3 g5 32. Ke3 Nc4+ 33. Kd3 Nxa3 34. Ke3 Nc4+ 35. Kd3 a5 36. Bb5 Nd6 37. Ba4 h6 38. Ke3 Nc4+ 39. Kf3 Nd2+ 40. Kg4 Ne4 41. h4 Nxf2+ 42. Kh5 gxh4 43. gxh4 f5 44. Kxh6 Ng4+ 45. Kg5 Nf6 46. Bb3 f4 47. c4 dxc4 48. Bxc4 a4 49. h5 a3 50. h6 f3 51. Kh4 f2 52. Kg3 f1Q 53. Bxf1 a2 54. Kf3 a1Q 55. Be2 Qd4 56. Kg2 Qe4+ 57. Bf3 Qh4 58. Bd1 Kf4 59. Bc2 Ke3 60. h7 Nxh7 61. Bxh7 Qxh7 62. Kg3 Qf5 63. Kg2 Qf4 64. Kg1 Qg3+ 65. Kh1 Qg4 66. Kh2 Kf2 67. Kh1 Qg2# 0-1

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.06"]
[Round "2"]
[White "Zijdemans, Ziggy"]
[Black "De Boer, Sipke"]
[Result "1/2-1/2"]
[ECO "C50"]
[WhiteElo "1180"]
[BlackElo "955"]
[PlyCount "102"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[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. Nc3 Bc5 4. Bc4 d6 5. d3 Bg4 6. Bxf7+ Kxf7 7. Ng5+ Ke8 8. Qxg4 Nf6 9. Qe6+ Qe7 10. Qxe7+ Kxe7 11. Be3 Bb4 12. 0-0 Rad8 13. Nd5+ Nxd5 14. exd5 Nd4 15. Bxd4 exd4 16. a3 Ba5 17. b4 Bb6 18. Rfe1+ Kf6 19. Nf3 Rde8 20. Kf1 c5 21. h3 Kf7 22. Ng5+ Kg6 23. Ne6 h5 24. Re2 h4 25. Rae1 a5 26. Nf4+ Kf7 27. Rxe8 Rxe8 28. Rxe8 Kxe8 29. bxa5 Bxa5 30. Ne6 g6 31. g4 b5 32. f4 Ke7 33. g5 Bd2 34. Ke2 Bc1 35. Kf3 Bxa3 36. Kg4 b4 37. Nxd4 cxd4 38. Kxh4 Bc1 39. Kg4 Kf7 40. h4 Kg7 41. f5 Kf7 42. fxg6+ Kxg6 43. h5+ Kg7 44. g6 Bh6 45. Kf5 Be3 46. Ke6 Bf4 47. Kd7 Kh6 48. Kc6 Kg7 49. Kb5 Bd2 50. Kc4 Bc3 51. Kb5 Bd2 1/2-1/2

[Event "NED-ch U14 op"]
[Site "Borne"]
[Date "2013.08.05"]
[Round "1"]
[White "De Boer, Sipke"]
[Black "Janse, Alexander"]
[Result "0-1"]
[ECO "D94"]
[WhiteElo "955"]
[BlackElo "1532"]
[PlyCount "116"]
[EventDate "2013.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. e3 cxd4 4. exd4 d5 5. Nf3 g6 6. Be2 Bg7 7. 0-0 0-0 8. Nc3 h6 9. b3 Nc6 10. Ba3 Qa5 11. Bb2 e6 12. cxd5 Nxd5 13. Nxd5 Qxd5 14. Qd3 Rd8 15. Rfd1 a5 16. a3 b6 17. Qe3 Bb7 18. Rd2 Ne7 19. Bc4 Qd6 20. a4 Nf5 21. Qc3 Qf4 22. Rad1 Bxf3 23. Qxf3 Qxf3 24. gxf3 Nh4 25. Be2 Rd5 26. Kh1 Rad8 27. f4 Nf5 28. Bf3 R5d6 29. Ba3 Rxd4 30. Rxd4 Nxd4 31. Rd3 Rc8 32. Bb2 Nxf3 33. Bxg7 Rc1+ 34. Rd1 Rxd1+ 35. Kg2 Kxg7 36. Kxf3 Rd3+ 37. Ke4 Rxb3 38. Kd4 Rb4+ 39. Ke3 Rxa4 40. f5 Kf6 41. fxg6 fxg6 42. h4 Ke5 43. h5 Ra3+ 44. Ke2 gxh5 45. Kf1 Kf4 46. Kg2 Ra2 47. Kf1 Kf3 48. Ke1 Rxf2 49. Kd1 Re2 50. Kc1 Ke3 51. Kd1 Kd3 52. Kc1 Rd2 53. Kb1 Kc3 54. Kc1 Rc2+ 55. Kd1 a4 56. Ke1 a3 57. Kd1 a2 58. Ke1 a1Q# 0-1

