[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.08.02"]
[Round "8"]
[White "Op den Dries, Johan"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "2093"]
[BlackElo "2052"]
[PlyCount "101"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. f4 e6 4. Nf3 d5 5. d3 Nf6 6. Be2 dxe4 7. dxe4 Qxd1+ 8. Bxd1 Be7 9. 0-0 0-0 10. h3 b6 11. e5 Nd5 12. Nxd5 exd5 13. Re1 h5 14. Nd2 g6 15. c3 Be6 16. Bf3 Rae8 17. Nf1 Rd8 18. Rd1 Na5 19. b3 d4 20. c4 Bd7 21. Ng3 f6 22. Bd5+ Kg7 23. Bd2 fxe5 24. fxe5 Nc6 25. e6 Be8 26. Rf1 Rxf1+ 27. Rxf1 Bh4 28. Ne4 Ne7 29. g3 Nxd5 30. cxd5 Be7 31. d6 Rxd6 32. Nxd6 Bxd6 33. Bf4 Be7 34. Be5+ Kg8 35. Bf6 Bd6 36. e7 Kf7 37. g4 hxg4 38. hxg4 d3 39. Bh4+ Ke6 40. Rd1 Bf4 41. Rxd3 g5 42. Bg3 Bxg3 43. Rxg3 Kxe7 44. Re3+ Kf7 45. Re5 Bd7 46. Rxg5 Kf6 47. Rg8 a5 48. Kf2 b5 49. Ke3 Be6 50. Rb8 b4 51. Rb6 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.08.01"]
[Round "7"]
[White "Koster, Chiel"]
[Black "Vos, Tjark"]
[Result "0-1"]
[ECO "C27"]
[WhiteElo "2052"]
[BlackElo "2178"]
[PlyCount "104"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 e5 2. Bc4 Nf6 3. d3 c6 4. Nc3 d5 5. Bb3 Bb4 6. Bd2 0-0 7. Nf3 Re8 8. h3 Na6 9. exd5 cxd5 10. a3 Bxc3 11. bxc3 h6 12. 0-0 Bf5 13. Re1 Qc7 14. d4 e4 15. Ne5 Nc5 16. Ba2 Ncd7 17. Nxd7 Bxd7 18. Rb1 b5 19. Re3 Kh7 20. Qe2 Rac8 21. Kh1 Re6 22. g4 Ra6 23. g5 hxg5 24. Rg3 e3 25. Rxe3 Rxa3 26. Bb3 Ra6 27. Re5 Ne4 28. Bxg5 Nxg5 29. Rxg5 Rh6 30. Qd3+ g6 31. Rg3 Qd6 32. Qf3 Be6 33. Qf6 a5 34. Re1 a4 35. Ba2 Rc6 36. Re5 b4 37. cxb4 Rxc2 38. Bb1 Rc1+ 39. Rg1 Rxg1+ 40. Kxg1 Qxb4 41. Bc2 Qb7 42. Re3 Qc8 43. Bxa4 g5 44. Qe7 Kg7 45. Be8 g4 46. h4 Rf6 47. Bb5 Qc2 48. Be2 Qf5 49. f3 Qf4 50. Qa3 Qg3+ 51. Kf1 gxf3 52. Bxf3 Bg4 0-1

[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.07.31"]
[Round "6"]
[White "Duijker, Rick"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "A37"]
[WhiteElo "2198"]
[BlackElo "2052"]
[PlyCount "85"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. g3 c5 2. Nf3 Nc6 3. Bg2 e5 4. d3 d6 5. 0-0 Nge7 6. c4 g6 7. Nc3 Bg7 8. Ne1 0-0 9. Nc2 Be6 10. Ne3 Qd7 11. Ned5 f5 12. Bg5 Nc8 13. Bd2 h6 14. e3 Rb8 15. a3 a6 16. b4 b5 17. cxb5 axb5 18. Rb1 c4 19. dxc4 bxc4 20. Qe2 e4 21. Qxc4 Ne5 22. Qc7 Qxc7 23. Nxc7 Bc4 24. Rfc1 Nb6 25. b5 Rbc8 26. Na6 Bd3 27. Ra1 d5 28. Nb4 Nec4 29. Be1 d4 30. exd4 Bxd4 31. Nc6 Bf6 32. a4 Nd6 33. Bf1 Nbc4 34. Ra2 Rfe8 35. Nd5 Kf7 36. Nxf6 Kxf6 37. Bc3+ Kf7 38. Bd4 Bxf1 39. Kxf1 g5 40. Rac2 Ke6 41. Rxc4 Nxc4 42. Rxc4 Kd5 43. Rc5+ 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.07.29"]
[Round "5"]
[White "Koster, Chiel"]
[Black "Weidemann, Jakob"]
[Result "1-0"]
[ECO "B45"]
[WhiteElo "2052"]
[BlackElo "2114"]
[PlyCount "89"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 Bc5 7. Nd6+ Ke7 8. Bf4 e5 9. Nf5+ Kf8 10. Bg5 d6 11. Ne3 Be6 12. Bd3 h6 13. Bxf6 Qxf6 14. 0-0 g6 15. Ncd5 Qd8 16. Kh1 Kg7 17. c3 Ne7 18. Bc4 a5 19. Qd3 Rf8 20. Rad1 f5 21. f4 Bxd5 22. Nxd5 Nxd5 23. Qxd5 Qe7 24. exf5 Rxf5 25. fxe5 dxe5 26. Rxf5 gxf5 27. g4 fxg4 28. Qe4 h5 29. Qf5 Rf8 30. Qxh5 Rf4 31. Bd3 Qf6 32. Qh7+ Kf8 33. Qxb7 Bb6 34. Bb5 Kg8 35. Qb8+ Kh7 36. Rd7+ Kh6 37. Rd6 Kg5 38. Qg8+ Kh4 39. Qh7+ Kg5 40. Qg8+ Kh4 41. Rxf6 Rxf6 42. Qh8+ Kg5 43. Qg7+ Rg6 44. Qxe5+ Kh6 45. Bd3 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.07.28"]
[Round "4"]
[White "Kurt, Sascha"]
[Black "Koster, Chiel"]
[Result "1/2-1/2"]
[ECO "B20"]
[WhiteElo "1986"]
[BlackElo "2052"]
[PlyCount "47"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 c5 2. a3 Nc6 3. b4 e5 4. b5 Nd4 5. c3 Ne6 6. Bc4 Nf6 7. d3 d5 8. exd5 Nxd5 9. Nf3 f6 10. Qb3 Ndc7 11. 0-0 Bd6 12. Re1 0-0 13. Nbd2 Kh8 14. Ne4 Be7 15. Ng3 Nf4 16. d4 cxd4 17. cxd4 Ng6 18. dxe5 Bg4 19. Bb2 Bxf3 20. Qxf3 Nxe5 21. Qe2 Bc5 22. Ne4 Bb6 23. a4 Nd5 24. Bxe5 1/2-1/2

[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.07.27"]
[Round "3"]
[White "Koster, Chiel"]
[Black "De Boer, Eelke"]
[Result "0-1"]
[ECO "A00"]
[WhiteElo "2052"]
[BlackElo "2270"]
[PlyCount "60"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. b4 e5 2. Bb2 f6 3. a3 d5 4. e3 Be6 5. Nf3 a5 6. b5 c5 7. bxc6 bxc6 8. c4 Bd6 9. Nc3 Ne7 10. cxd5 cxd5 11. Nb5 0-0 12. Nxd6 Qxd6 13. Be2 Nbc6 14. d3 a4 15. 0-0 Rfb8 16. Rb1 d4 17. Nd2 dxe3 18. fxe3 Ba2 19. Ne4 Qe6 20. Qd2 Bxb1 21. Rxb1 Na5 22. d4 exd4 23. Qxd4 Nac6 24. Qd3 Ne5 25. Bxe5 Rxb1+ 26. Qxb1 Qxe5 27. Bc4+ Kh8 28. Qd3 Nf5 29. g4 Re8 30. Bd5 Rd8 0-1

[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.07.26"]
[Round "2"]
[White "Shakhverdian, William"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "E04"]
[WhiteElo "2129"]
[BlackElo "2052"]
[PlyCount "98"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 dxc4 5. Bg2 a6 6. 0-0 Nc6 7. Nc3 Bb4 8. Qc2 0-0 9. Rd1 Qe7 10. a3 Bd6 11. Bg5 h6 12. Bxf6 Qxf6 13. e4 e5 14. Nd5 Qe6 15. dxe5 Nxe5 16. Nd4 Qg4 17. f4 Nc6 18. Qxc4 Nxd4 19. Qxd4 f6 20. Ne3 Qh5 21. Qd5+ Qxd5 22. Nxd5 c6 23. Nc3 Bc5+ 24. Kf1 Bg4 25. Rd3 Rfd8 26. Rxd8+ Rxd8 27. h3 Bh5 28. g4 Bf7 29. Rd1 Rxd1+ 30. Nxd1 g5 31. fxg5 hxg5 32. Ke2 Bc4+ 33. Kd2 Bd4 34. Nc3 Kf7 35. Kc2 Ke7 36. b3 Bf7 37. Ne2 Be5 38. Ng1 Bd6 39. Kb2 Bg6 40. a4 Ke6 41. Nf3 Be5+ 42. Kc1 Kd6 43. Ne1 Kc5 44. Kd2 Kb4 45. Kc2 Ka3 46. Nd3 Bf7 47. Nc5 b6 48. Nxa6 Bxb3+ 49. Kb1 Bc4 0-1

[Event "Dieren op"]
[Site "Dieren"]
[Date "2023.07.25"]
[Round "1"]
[White "Koster, Chiel"]
[Black "Maatman, Nick"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "2052"]
[BlackElo "2362"]
[PlyCount "82"]
[EventDate "2023.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. exd5 exd5 4. d4 Nc6 5. c3 Bd6 6. Bd3 Nge7 7. Qc2 Bg4 8. Nbd2 Qd7 9. 0-0 f6 10. b4 Bf5 11. Re1 0-0 12. Nf1 Bxd3 13. Qxd3 Qf5 14. Qd1 g5 15. Ne3 Qg6 16. g3 Qh5 17. Kg2 Kh8 18. g4 Qf7 19. Rh1 Rg8 20. Qd3 Raf8 21. b5 Nd8 22. Nf5 Nxf5 23. Qxf5 Qe6 24. Qxe6 Nxe6 25. Re1 Re8 26. a4 Kg7 27. a5 Kf7 28. a6 b6 29. Ng1 h5 30. f3 h4 31. Nh3 Rc8 32. Rb1 c6 33. Bd2 c5 34. Rbc1 cxd4 35. cxd4 Nxd4 36. Nf2 Nxb5 37. Be3 Rge8 38. Nd3 Rxc1 39. Nxc1 Bf4 40. Kf2 Bxh2 41. Ne2 d4 0-1

[Event "Eindhoven WLC op 13th"]
[Site "Eindhoven"]
[Date "2023.05.07"]
[Round "6"]
[White "Bollen, Guus"]
[Black "Koster, Chiel"]
[Result "1/2-1/2"]
[ECO "E63"]
[WhiteElo "2182"]
[BlackElo "2010"]
[PlyCount "111"]
[EventDate "2023.05.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 0-0 5. Bg2 d6 6. 0-0 Nc6 7. Nc3 a6 8. Re1 Rb8 9. a4 Na5 10. b3 c6 11. e4 b5 12. axb5 axb5 13. cxb5 cxb5 14. b4 Nc4 15. Qd3 Qb6 16. Bg5 Bb7 17. Rac1 Rfc8 18. Bf1 Ba8 19. h4 Rc7 20. Bh3 h5 21. Rc2 Ra7 22. Bxf6 Bxf6 23. Nxb5 Qxb5 24. Rxc4 Rc7 25. Rc3 Rxc3 26. Qxc3 Qxb4 27. Qxb4 Rxb4 28. d5 Bb7 29. Bd7 Rb3 30. Kg2 Rb2 31. Re3 Kg7 32. Re1 Bc3 33. Re3 Bb4 34. Ng5 Ba6 35. Rf3 f6 36. Ne6+ Kh6 37. Be8 Be2 38. Re3 g5 39. hxg5+ fxg5 40. Nd4 Bg4 41. Rb3 Rxb3 42. Nxb3 Bc3 43. Nc1 Bd1 44. Bb5 Bd2 45. Be2 Ba4 46. Nd3 Bc2 47. Kh3 Bb3 48. Nb2 Be1 49. Kg2 h4 50. Bc4 Bc3 51. Bxb3 Bxb2 52. Kh3 Bd4 53. gxh4 Bxf2 54. hxg5+ Kxg5 55. Kg2 Bd4 56. Kg3 1/2-1/2

[Event "Eindhoven WLC op 13th"]
[Site "Eindhoven"]
[Date "2023.05.07"]
[Round "5"]
[White "Koster, Chiel"]
[Black "Sprangers, Remco"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2010"]
[BlackElo "2240"]
[PlyCount "66"]
[EventDate "2023.05.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 g6 7. g4 h5 8. g5 Nfd7 9. Be3 Bg7 10. Qd2 0-0 11. 0-0-0 b5 12. f4 Nc5 13. Bd3 Qa5 14. Kb1 Nxd3 15. Qxd3 Bb7 16. Rhf1 Nd7 17. Nb3 Qc7 18. e5 Nc5 19. Nxc5 dxc5 20. e6 Rfd8 21. exf7+ Kxf7 22. Qe2 e6 23. Bd2 Qc6 24. Rfe1 Rd6 25. Bc1 Rad8 26. f5 gxf5 27. Qxh5+ Kf8 28. Rxd6 Rxd6 29. Ne4 Rd8 30. Nf6 Qf3 31. Qh7 Kf7 32. Nh5 Rg8 33. g6+ Kf8 1-0

[Event "Eindhoven WLC op 13th"]
[Site "Eindhoven"]
[Date "2023.05.06"]
[Round "4"]
[White "Beerdsen, Thomas"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B31"]
[WhiteElo "2507"]
[BlackElo "2010"]
[PlyCount "39"]
[EventDate "2023.05.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. 0-0 Bg7 5. c3 e5 6. d4 cxd4 7. cxd4 exd4 8. Bf4 d6 9. Nxd4 Nge7 10. Nc3 a6 11. Nxc6 bxc6 12. Bc4 Rb8 13. Bxd6 Rxb2 14. e5 Qa5 15. Bxe7 Kxe7 16. Qd6+ Ke8 17. Qxc6+ Bd7 18. Bxf7+ Kxf7 19. Qxd7+ Kg8 20. Nd5 1-0

[Event "Eindhoven WLC op 13th"]
[Site "Eindhoven"]
[Date "2023.05.06"]
[Round "2"]
[White "Koes, Richard"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "B20"]
[WhiteElo "1809"]
[BlackElo "2010"]
[PlyCount "54"]
[EventDate "2023.05.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. b4 e5 3. Nf3 Nc6 4. b5 Nd4 5. c3 Nxf3+ 6. Qxf3 d5 7. exd5 Nf6 8. c4 Bd6 9. Nc3 0-0 10. Bb2 e4 11. Qd1 Re8 12. Be2 Bf5 13. h3 Nd7 14. Qb3 Ne5 15. 0-0-0 Bg6 16. h4 h5 17. Rdg1 f5 18. Qd1 f4 19. f3 e3 20. dxe3 fxe3 21. g4 Nxf3 22. Bxf3 e2 23. Nxe2 Rxe2 24. Qxe2 Bf4+ 25. Kd1 Qa5 26. gxh5 Re8 27. Qg2 Qa4+ 0-1

[Event "Eindhoven WLC op 13th"]
[Site "Eindhoven"]
[Date "2023.05.06"]
[Round "3"]
[White "Koster, Chiel"]
[Black "Baselmans, Luuk"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "2010"]
[BlackElo "2340"]
[PlyCount "63"]
[EventDate "2023.05.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 e6 2. Nc3 d5 3. g3 d4 4. Nce2 c5 5. d3 Nc6 6. f4 Bd6 7. Nf3 Nge7 8. Bg2 f6 9. 0-0 0-0 10. h3 Rb8 11. c3 b5 12. cxd4 cxd4 13. Kh2 Qb6 14. g4 a5 15. g5 fxg5 16. e5 Bc7 17. Nxg5 Nf5 18. Ng3 Nxg3 19. Kxg3 h6 20. Ne4 Bb7 21. Qg4 Ne7 22. Nf6+ Rxf6 23. exf6 Nf5+ 24. Kh2 Bxg2 25. Qxg2 Rf8 26. fxg7 Rf7 27. Bd2 Nxg7 28. Qe4 Qb8 29. Rae1 Rf5 30. Rg1 Kh8 31. Qxd4 e5 32. Qd7 1-0

[Event "Eindhoven WLC op 12th"]
[Site "Eindhoven"]
[Date "2022.05.15"]
[Round "6"]
[White "Koster, Chiel"]
[Black "Van Roon, Sjoerd"]
[Result "1/2-1/2"]
[ECO "B90"]
[WhiteElo "1924"]
[BlackElo "2264"]
[PlyCount "114"]
[EventDate "2022.05.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 e5 7. Nde2 Be7 8. g4 h6 9. Bg2 b5 10. Be3 Bb7 11. 0-0 0-0 12. Ng3 b4 13. Nd5 Nxd5 14. exd5 Bg5 15. Qd2 Bxe3 16. fxe3 a5 17. Rf2 Nd7 18. Nf5 Nc5 19. a3 b3 20. c3 Ba6 21. e4 Kh7 22. h4 Nd3 23. Rf3 Nf4 24. Rxf4 exf4 25. Qxf4 Qf6 26. Qxd6 Qxd6 27. Nxd6 Rad8 28. Nf5 Rfe8 29. Kf2 Bc8 30. Ne3 g6 31. c4 Kg7 32. c5 Ba6 33. Rd1 Rc8 34. c6 Bb5 35. Rc1 Kf6 36. Rc5 Ba4 37. Nc4 Rb8 38. c7 Rbc8 39. Nd6 Ke5 40. Nxe8 Bxe8 41. Ke3 Bd7 42. Bf3 g5 43. h5 f6 44. Be2 Kd6 45. Kd4 a4 46. Ra5 Kxc7 47. Rc5+ Kd6 48. Rxc8 Bxc8 49. Ke3 Bd7 50. Kf3 Ke5 51. Bd3 Kd4 52. Ba6 Ke5 53. Bb7 Kd6 54. Ba8 Kc5 55. Bb7 Kd6 56. Ba8 Kc5 57. Bb7 Kd6 1/2-1/2

[Event "Eindhoven WLC op 12th"]
[Site "Eindhoven"]
[Date "2022.05.15"]
[Round "5"]
[White "Slagboom, Leandro"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "E06"]
[WhiteElo "1997"]
[BlackElo "1924"]
[PlyCount "84"]
[EventDate "2022.05.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 c6 5. Bg2 Be7 6. 0-0 0-0 7. Qc2 b6 8. Nbd2 Bb7 9. e4 dxc4 10. Nxc4 h6 11. Rd1 Nbd7 12. Ne3 Rc8 13. b3 Qc7 14. Bb2 Rfd8 15. Rac1 Qb8 16. Ne1 Qa8 17. f4 Nf8 18. Qd2 Rd7 19. e5 Ne8 20. f5 exf5 21. h4 Ne6 22. Nxf5 Bf8 23. Bf3 Rcd8 24. Qg2 g6 25. d5 cxd5 26. Nd4 Bc5 27. Kh2 Nxd4 28. Bxd4 Bxd4 29. Rxd4 Re7 30. Nd3 Nc7 31. Bg4 Nb5 32. Rb4 d4 33. Qf2 Be4 34. Qd2 Nc3 35. Nf2 Qd5 36. Qxh6 Nxa2 37. e6 Nxc1 38. Qxc1 f5 39. Qg5 Qxe6 40. Nxe4 fxg4 41. Nf6+ Kf7 42. Nxg4 Qe2+ 0-1

[Event "Eindhoven WLC op 12th"]
[Site "Eindhoven"]
[Date "2022.05.14"]
[Round "2"]
[White "Koster, Chiel"]
[Black "Kools, Jasper"]
[Result "1/2-1/2"]
[ECO "B42"]
[WhiteElo "1924"]
[BlackElo "1774"]
[PlyCount "51"]
[EventDate "2022.05.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5 6. Be3 Qb6 7. c3 Nc6 8. Qb3 Qa7 9. Nxc6 bxc6 10. Bxc5 Qxc5 11. Qa3 Qxa3 12. Nxa3 d5 13. Nc2 Nf6 14. exd5 cxd5 15. 0-0 0-0 16. c4 dxc4 17. Bxc4 Bb7 18. Ne3 Rfd8 19. Rfd1 Kf8 20. b4 Ke7 21. a4 Nd5 22. Bxd5 Bxd5 23. b5 axb5 24. axb5 Rxa1 25. Rxa1 Rb8 26. Ra7+ 1/2-1/2

[Event "Eindhoven WLC op 12th"]
[Site "Eindhoven"]
[Date "2022.05.14"]
[Round "4"]
[White "Koster, Chiel"]
[Black "Van Helvoort, Rob AM"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "1924"]
[BlackElo "2133"]
[PlyCount "37"]
[EventDate "2022.05.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. e4 g6 2. Nc3 Bg7 3. h4 h6 4. d4 d6 5. Be3 a6 6. h5 g5 7. Bd3 Nd7 8. Nge2 b5 9. f4 gxf4 10. Nxf4 Ngf6 11. Qf3 e5 12. Nfd5 Nxd5 13. Nxd5 Bb7 14. Qg3 Bf8 15. Rf1 Bxd5 16. exd5 e4 17. Rxf7 exd3 18. Qg6 Qh4+ 19. g3 1-0

[Event "Eindhoven WLC op 12th"]
[Site "Eindhoven"]
[Date "2022.05.14"]
[Round "3"]
[White "Van der Valk, Niklas"]
[Black "Koster, Chiel"]
[Result "1/2-1/2"]
[ECO "E61"]
[WhiteElo "2200"]
[BlackElo "1924"]
[PlyCount "133"]
[EventDate "2022.05.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 d6 5. d4 exd4 6. Nxd4 Bd7 7. Bg2 g6 8. b3 Bg7 9. Bb2 0-0 10. 0-0 Re8 11. e3 h5 12. Nxc6 Bxc6 13. Bxc6 bxc6 14. Qf3 Ne4 15. Nxe4 Bxb2 16. Rab1 Bg7 17. h4 a5 18. Ng5 Qd7 19. c5 d5 20. Kg2 Qe7 21. Rfc1 Bh6 22. Nh3 d4 23. Rf1 dxe3 24. fxe3 f5 25. Qxc6 Qe4+ 26. Qxe4 Rxe4 27. Nf4 Kf7 28. Kf2 Rae8 29. Rfe1 Bf8 30. Rbc1 c6 31. Rc3 a4 32. Rd1 R8e5 33. Rd7+ Ke8 34. Rd4 axb3 35. axb3 Bxc5 36. Rxe4 fxe4 37. Nxg6 Rf5+ 38. Nf4 Kd7 39. Rc4 Re5 40. Ng6 Rf5+ 41. Nf4 Re5 42. Ke2 Bb6 43. b4 Kd6 44. Kd2 Ba7 45. Ne2 Kd5 46. Rc1 Rf5 47. Nf4+ Kd6 48. Ra1 Bb6 49. Ke2 Rb5 50. Ra4 Kc7 51. Nh3 Kd6 52. Nf2 Ke5 53. Nd1 c5 54. bxc5 Rxc5 55. Nf2 Rc2+ 56. Kf1 Kf5 57. Ra3 Bc7 58. Kg2 Re2 59. Rb3 Be5 60. Ra3 Bc7 61. Ra7 Bb6 62. Rf7+ Kg6 63. Kf1 Rxe3 64. Rf4 Rf3 65. Rxf3 exf3 66. g4 hxg4 67. Nxg4 1/2-1/2

[Event "Eindhoven WLC op 12th"]
[Site "Eindhoven"]
[Date "2022.05.13"]
[Round "1"]
[White "Roebers, Eline"]
[Black "Koster, Chiel"]
[Result "1/2-1/2"]
[ECO "B33"]
[WhiteElo "2369"]
[BlackElo "1924"]
[PlyCount "122"]
[EventDate "2022.05.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 Bg7 11. g3 Ne7 12. Nxe7 Qxe7 13. Bg2 d5 14. Qxd5 Bb7 15. Qb3 f5 16. 0-0 fxe4 17. Rfe1 f5 18. c4 Qf7 19. Rad1 0-0 20. cxb5 Qxb3 21. axb3 axb5 22. Nxb5 Rab8 23. Nd6 Bc8 24. g4 fxg4 25. Nxc8 Rbxc8 26. Bxe4 Rf4 27. Rd7 h5 28. Bd5+ Kh7 29. Rxe5 Kh6 30. Rd6+ Bf6 31. Re4 Rd8 32. Rxf4 Rxd6 33. Bf7 Bd4 34. Kg2 Kg5 35. Re4 Bxf2 36. Bxh5 Rd2 37. Bxg4 Rxb2 38. Be6 Bb6+ 39. Kf3 Rxh2 40. Bc4 Rf2+ 41. Kg3 Rf6 42. Re5+ Rf5 43. Re7 Rf6 44. b4 Bf2+ 45. Kg2 Bb6 46. b5 Kg4 47. Be2+ Kg5 48. Bd3 Kg4 49. Be2+ Kg5 50. Bf3 Kf4 51. Bc6 Kg5 52. Kh3 Kf4 53. Re4+ Kf5 54. Re2 Kf4 55. Be8 Be3 56. Re1 Kf3 57. Bh5+ Ke4 58. Kg3 Kd3 59. Rb1 Ke4 60. b6 Rxb6 61. Rxb6 Bxb6 1/2-1/2

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.21"]
[Round "12"]
[White "Koster, Chiel"]
[Black "Burri, Quentin"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "1913"]
[BlackElo "2415"]
[PlyCount "50"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 e5 7. Nde2 b5 8. g4 b4 9. Nd5 Nxd5 10. Qxd5 Ra7 11. Be3 Be6 12. Qd2 Rd7 13. Bg2 d5 14. exd5 Bxd5 15. Bxd5 Rxd5 16. Qc1 Nc6 17. c3 Be7 18. 0-0 h5 19. cxb4 Qd7 20. Rd1 hxg4 21. Rxd5 Qxd5 22. Qd1 Qe6 23. Rc1 gxh3 24. Qa4 h2+ 25. Kg2 Qh3+ 0-1

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.21"]
[Round "10"]
[White "Koster, Chiel"]
[Black "Kulvinder"]
[Result "1/2-1/2"]
[ECO "B93"]
[WhiteElo "1913"]
[PlyCount "133"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. Be3 a6 8. 0-0 0-0 9. f4 Nbd7 10. Bf3 Rb8 11. Kh1 Qc7 12. a4 e5 13. Nde2 Re8 14. g3 exf4 15. Nxf4 Nb6 16. Bd4 Nbd7 17. Nfd5 Nxd5 18. Nxd5 Qd8 19. Bxg7 Kxg7 20. Qd4+ Nf6 21. Bg2 Re5 22. Nxf6 Be6 23. Nd5 Bxd5 24. exd5 Kg8 25. Rae1 Rxe1 26. Rxe1 Rc8 27. c4 Qa5 28. Re7 Qxa4 29. Bh3 Rxc4 30. Re8+ Qxe8 31. Qxc4 Qe1+ 32. Qf1 Qxf1+ 33. Bxf1 Kf8 34. Kg2 Ke7 35. Kf3 Kf6 36. Ke4 Kg5 37. Be2 f5+ 38. Kd4 Kf6 39. b4 Kg5 40. h4+ Kf6 41. Bd3 Kf7 42. Bf1 Kf6 43. Be2 Kf7 44. b5 axb5 45. Bxb5 Kf6 46. Bc4 Kf7 47. Bd3 Kf6 48. Bb5 Kf7 49. Ke3 Kf6 50. Kd4 Kf7 51. Bd7 b6 52. g4 fxg4 53. Bxg4 Kf6 54. Ke4 h5 55. Bd7 g5 56. hxg5+ Kxg5 57. Bb5 h4 58. Bf1 Kg4 59. Kd4 Kg3 60. Kc4 Kf2 61. Bh3 Kg3 62. Be6 Kf3 63. Bd7 Ke4 64. Bh3 b5+ 65. Kxb5 Kxd5 66. Kb4 Kd4 67. Bg2 1/2-1/2

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.21"]
[Round "9"]
[White "Koster, Chiel"]
[Black "Nur Abidah, Shanti"]
[Result "1-0"]
[ECO "A00"]
[WhiteElo "1913"]
[BlackElo "1986"]
[PlyCount "53"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 d5 2. Nc3 d4 3. Nce2 c5 4. d3 e5 5. f4 Bd6 6. Nf3 Nc6 7. g3 f5 8. exf5 Bxf5 9. Bg2 Nge7 10. 0-0 0-0 11. fxe5 Nxe5 12. Nxe5 Bxe5 13. Nf4 Qd7 14. Qe2 Bd6 15. Bd2 Rae8 16. Rae1 Ng6 17. Bd5+ Kh8 18. Nxg6+ Bxg6 19. Rxf8+ Rxf8 20. Qe6 Qc7 21. Rf1 Re8 22. Qg4 Be5 23. Qf3 Bf6 24. Bxb7 Rb8 25. Bd5 Rxb2 26. Bb3 c4 27. Qa8+ 1-0

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.21"]
[Round "7"]
[White "Koster, Chiel"]
[Black "Salah, Nadezhda"]
[Result "1-0"]
[ECO "B02"]
[WhiteElo "1913"]
[BlackElo "2026"]
[PlyCount "72"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 e6 2. Nc3 d5 3. g3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Bg2 f6 8. 0-0 fxe5 9. Nxe5 Ndxe5 10. fxe5 Nxe5 11. Qh5+ Ng6 12. d3 Be7 13. Bd2 Bf6 14. Nxd5 exd5 15. Rae1+ Kf8 16. Bxd5 Bg4 17. Rxf6+ Qxf6 18. Qxg4 Ne5 19. Qe2 Nf7 20. Bxf7 Kxf7 21. Rf1 Rhf8 22. Rxf6+ Kxf6 23. Bc3+ Kf7 24. Qe5 g6 25. Qf6+ Ke8 26. Qe6+ Kd8 27. Bf6+ Kc7 28. Be5+ Kd8 29. Qd6+ Ke8 30. Bf6 Rf7 31. Qe5+ Kf8 32. Be7+ Kg8 33. Bxc5 Rf5 34. Qe6+ Kg7 35. Qe7+ Rf7 36. Bd4+ Kg8 1-0

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.21"]
[Round "8"]
[White "Thanga Manickam, M."]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "E35"]
[WhiteElo "1623"]
[BlackElo "1913"]
[PlyCount "55"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 Bb4 6. Qc2 Nc6 7. e3 Be6 8. h3 h6 9. Bf4 Bd6 10. Bxd6 Qxd6 11. Nf3 0-0 12. Bd3 Nb4 13. Qe2 Nxd3+ 14. Qxd3 c5 15. dxc5 Qxc5 16. 0-0 Rac8 17. Rfd1 Rfe8 18. Nd4 Bd7 19. Rac1 Qb6 20. b3 Ne4 21. Nxd5 Qa5 22. Rxc8 Bxc8 23. Nb5 Qxa2 24. Ne7+ Rxe7 25. Qd8+ Kh7 26. Qxe7 Qxf2+ 27. Kh1 Qg3 28. Qxe4+ 1-0

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.21"]
[Round "11"]
[White "Wienegge, Sophie"]
[Black "Koster, Chiel"]
[Result "1/2-1/2"]
[ECO "B33"]
[BlackElo "1913"]
[PlyCount "87"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 c5 2. d4 cxd4 3. Nf3 Nc6 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 Be6 9. Bd3 Be7 10. Bxf6 Bxf6 11. 0-0 0-0 12. Nd5 Bxd5 13. exd5 Ne7 14. Bc4 b5 15. Be2 g6 16. c3 Bg7 17. Nc2 f5 18. a4 bxa4 19. Nb4 Qb6 20. Rxa4 a5 21. Nc6 Nxc6 22. dxc6 Qxc6 23. Bc4+ Kh8 24. Bd5 Qb6 25. Bxa8 Rxa8 26. b4 e4 27. bxa5 Rxa5 28. Rxa5 Qxa5 29. Qxd6 h6 30. Qxg6 Qxc3 31. Rd1 Qc8 32. Rb1 Qf8 33. h3 Qc8 34. g3 e3 35. fxe3 Bf8 36. Qf6+ Kg8 37. Qg6+ Kh8 38. Qf6+ Kg8 39. Rf1 Bc5 40. Qg6+ Kh8 41. Qxh6+ Kg8 42. Re1 Qe8 43. Qg5+ Kh8 44. Qxf5 1/2-1/2

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.20"]
[Round "2"]
[White "Albornoz Cabrera, Carlos Daniel"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B33"]
[WhiteElo "2573"]
[BlackElo "1913"]
[PlyCount "149"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 Be6 9. Nc4 Rc8 10. Nd5 Bxd5 11. Bxf6 gxf6 12. Qxd5 Nb4 13. Qd2 d5 14. exd5 Qxd5 15. Qxd5 Nxd5 16. 0-0-0 Rd8 17. Be2 b5 18. Na5 Bh6+ 19. Kb1 0-0 20. Bf3 Nf4 21. Nc6 Rxd1+ 22. Rxd1 Ne6 23. c3 Kh8 24. g3 Rc8 25. Bg2 Bf8 26. b4 Kg7 27. Kb2 Rc7 28. Kb3 Kg8 29. h4 Bg7 30. g4 h5 31. gxh5 f5 32. Bd5 e4 33. Bxe6 fxe6 34. Rd6 Kf7 35. h6 Bxh6 36. Nd8+ Kg8 37. Nxe6 Rf7 38. Nd8 Rh7 39. Kc2 f4 40. Ne6 Re7 41. Kd1 Kf7 42. Nd4 Bg7 43. Nf5 Re5 44. Rd7+ Ke6 45. Rxg7 Rxf5 46. h5 Rxh5 47. Ke2 Kd5 48. Rf7 f3+ 49. Ke3 Rh1 50. Rf5+ Ke6 51. Kxe4 Re1+ 52. Kf4 Re2 53. Kxf3 Rxa2 54. Rc5 Kd6 55. Ke3 a5 56. Rxb5 a4 57. Ra5 a3 58. Kd3 Rxf2 59. Rxa3 Kd5 60. Ra5+ Kc6 61. Kc4 Rf4+ 62. Kb3 Rf1 63. Rh5 Kb6 64. Rh6+ Kc7 65. b5 Rf5 66. Kb4 Rf3 67. c4 Rf4 68. b6+ Kb7 69. Kb5 Rf1 70. Rh7+ Kb8 71. c5 Rf5 72. Ka6 Rxc5 73. Rh8+ Rc8 74. Rxc8+ Kxc8 75. Ka7 1-0

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.20"]
[Round "6"]
[White "Gesyan, Suren"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B24"]
[WhiteElo "1945"]
[BlackElo "1913"]
[PlyCount "67"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 d6 4. Bg2 Bd7 5. d3 Nf6 6. Nge2 Qc8 7. Be3 g6 8. 0-0 Bg7 9. f3 0-0 10. Qd2 Nd4 11. Nd1 Bh3 12. c3 Bxg2 13. Kxg2 Nxe2 14. Qxe2 e5 15. Qd2 Nh5 16. g4 Nf4+ 17. Bxf4 exf4 18. Qxf4 f5 19. gxf5 gxf5 20. Qxd6 fxe4 21. dxe4 Rf6 22. Qd5+ Kh8 23. Ne3 Rg6+ 24. Kh1 Qh3 25. Qf5 Qh4 26. Ng2 Qh6 27. Qf4 Qh5 28. Qh4 Qe5 29. Rad1 Rg8 30. Rd5 Qe6 31. Nf4 Qa6 32. Nxg6+ Qxg6 33. Rg1 Qf7 34. Rf5 1-0

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.20"]
[Round "5"]
[White "Koster, Chiel"]
[Black "Arpita, Mukherjee"]
[Result "1/2-1/2"]
[ECO "B81"]
[WhiteElo "1913"]
[BlackElo "2206"]
[PlyCount "147"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 e6 7. g4 Nfd7 8. Bg2 Qc7 9. 0-0 Be7 10. f4 b5 11. f5 Ne5 12. fxe6 fxe6 13. Bf4 b4 14. Nce2 0-0 15. Qe1 Nbc6 16. Nxc6 Qxc6 17. Qxb4 Ng6 18. Nd4 Qe8 19. Be3 Nh4 20. Bh1 Bd7 21. Rxf8+ Bxf8 22. Rf1 Ng6 23. Qe1 Rb8 24. b3 Ne5 25. Bf4 Be7 26. Qg3 Nf7 27. Bc1 Bf6 28. Bb2 Be5 29. Qf2 Ng5 30. Bg2 h6 31. c4 Qg6 32. Qe3 Nh7 33. Ba1 Nf6 34. Ne2 Bxa1 35. Rxa1 Bc6 36. Nf4 Qe8 37. e5 dxe5 38. Qxe5 Bxg2 39. Nxg2 Nd7 40. Qe4 e5 41. Re1 Qe7 42. Qd5+ Kh8 43. Nf4 Qf6 44. Nh5 Qb6+ 45. Kg2 Rf8 46. Re2 Nf6 47. Qxe5 Qc6+ 48. Kh2 Nxh5 49. gxh5 Qd7 50. Rg2 Rf3 51. Rg3 Rf2+ 52. Rg2 Rf3 53. Rg3 Rf5 54. Qb8+ Kh7 55. Rg2 Rxh5 56. Qg3 Rg5 57. Qc3 Qd6+ 58. Kg1 Qd1+ 59. Kh2 Rxg2+ 60. Kxg2 Qe2+ 61. Kg1 Qxa2 62. Qd3+ Kg8 63. Qd5+ Kh7 64. Qf5+ Kh8 65. Qc8+ Kh7 66. Qf5+ Kg8 67. Qe6+ Kf8 68. Qd6+ Kf7 69. Qd5+ Kf6 70. Qf3+ Ke7 71. Qe4+ Kf8 72. Qf5+ Kg8 73. Qe6+ Kh7 74. Qf5+ 1/2-1/2

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.20"]
[Round "3"]
[White "Koster, Chiel"]
[Black "Fuentes Flores, Estrella Azucena"]
[Result "1-0"]
[ECO "C54"]
[WhiteElo "1913"]
[PlyCount "93"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Bc5 5. 0-0 d6 6. c3 Na5 7. Bb5+ c6 8. Ba4 b5 9. Bc2 Bb6 10. b4 Nb7 11. a4 Bg4 12. axb5 cxb5 13. Nbd2 0-0 14. Bb2 a5 15. bxa5 Bxa5 16. Nb3 Qc7 17. Nxa5 Rxa5 18. Rxa5 Nxa5 19. Qe2 Nh5 20. h3 Nf4 21. Qe3 Bh5 22. Rc1 Rc8 23. Kh2 Qd7 24. Ng1 f5 25. g3 Ne6 26. exf5 Nc5 27. g4 Bf7 28. Ne2 Nab3 29. Rg1 Ra8 30. Nc1 Nxc1 31. Bxc1 Ra2 32. Bb1 Ra6 33. d4 exd4 34. Qxd4 Ra4 35. Qd1 Ne4 36. Qe1 d5 37. f3 Qd6+ 38. Kh1 Nc5 39. Be3 Nb3 40. g5 Bh5 41. Rg3 Kf8 42. g6 h6 43. Bxh6 gxh6 44. g7+ Kg8 45. f6 Rf4 46. Bh7+ Kxh7 47. g8Q# 1-0

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.20"]
[Round "1"]
[White "Koster, Chiel"]
[Black "Murali, Hariprasad"]
[Result "1-0"]
[ECO "B02"]
[WhiteElo "1913"]
[PlyCount "59"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. e4 d5 2. Nc3 dxe4 3. Nxe4 Nf6 4. d3 Nxe4 5. dxe4 Qxd1+ 6. Kxd1 e6 7. Be3 a6 8. c3 Nc6 9. Nf3 Bd7 10. Be2 Bd6 11. Kc2 Ne5 12. Nxe5 Bxe5 13. Rad1 0-0-0 14. f4 Bd6 15. e5 Be7 16. Bf3 f6 17. Rd2 Be8 18. Rxd8+ Bxd8 19. Bg4 f5 20. Bf3 h6 21. h4 h5 22. Bc5 b6 23. Ba3 Rh6 24. g3 Rg6 25. Bxh5 Bc6 26. Bxg6 Bxh1 27. Bf8 Bf3 28. Bxg7 Kd7 29. h5 c5 30. h6 1-0

[Event "FIDE World Uni Rapid-C 1st"]
[Site "Tornelo INT"]
[Date "2021.03.20"]
[Round "4"]
[White "Sudhanva, KV."]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "A26"]
[BlackElo "1913"]
[PlyCount "62"]
[EventDate "2021.03.20"]
[EventType "swiss (rapid)"]
[EventRounds "12"]
[EventCountry "NET"]
[SourceTitle "CBM 201 Extra"]
[Source "ChessBase"]
[SourceDate "2021.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2021.05.31"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 d6 5. Bg2 g6 6. 0-0 Bg7 7. d3 0-0 8. a3 a5 9. Bg5 h6 10. Be3 Ng4 11. h3 Nxe3 12. fxe3 Ne7 13. d4 Nf5 14. Qd3 Nxg3 15. Rf2 f5 16. dxe5 dxe5 17. Nxe5 Bxe5 18. Nd5 c6 19. Nf4 Qxd3 20. Nxd3 Bc7 21. Kh2 Ne4+ 22. Kg1 Nxf2 23. Kxf2 Be6 24. b3 Rfe8 25. Rd1 Rad8 26. e4 fxe4 27. Bxe4 Kg7 28. Kf3 Bxh3 29. Rh1 Rxe4 30. Kxe4 Bg2+ 31. Ke3 Rxd3+ 0-1

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "3.48"]
[White "Abbott, Thomas"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "B22"]
[BlackElo "1913"]
[PlyCount "58"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nc6 3. d4 d5 4. Nd2 e5 5. dxc5 Bxc5 6. Ngf3 dxe4 7. Nxe4 Qxd1+ 8. Kxd1 Be7 9. Bg5 Bxg5 10. Nexg5 Bd7 11. Bc4 Nh6 12. Re1 f6 13. Ne6 Bxe6 14. Bxe6 Ke7 15. Bd5 Rhd8 16. c4 Nb4 17. Nxe5 fxe5 18. Rxe5+ Kf8 19. a3 Nxd5 20. cxd5 Re8 21. f4 Rad8 22. Rg5 Re4 23. g3 Rd4+ 24. Kc2 R4xd5 25. Rf1 Nf7 26. Rxd5 Rxd5 27. Kc3 Nd6 28. g4 Ne4+ 29. Kb3 Nd2+ 0-1

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "7.25"]
[White "Amaro Alfonso, Raynner"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B20"]
[WhiteElo "2186"]
[BlackElo "1913"]
[PlyCount "103"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 c5 2. Ne2 Nc6 3. g3 d6 4. Bg2 g6 5. 0-0 Bd7 6. c3 Qc8 7. d4 cxd4 8. cxd4 Bg7 9. Nbc3 Nf6 10. Be3 Bh3 11. Rc1 Bxg2 12. Kxg2 0-0 13. d5 Ne5 14. Bd4 Nfd7 15. f4 Ng4 16. h3 Nh6 17. Nb5 Qd8 18. Bxg7 Kxg7 19. Qd4+ f6 20. Qd2 Nc5 21. b4 a6 22. Nbd4 Nxe4 23. Qe3 Qd7 24. Qxe4 Rfc8 25. Qe6 Qd8 26. Nb3 Nf5 27. Ned4 Nxd4 28. Nxd4 Rc7 29. Rxc7 Qxc7 30. Qe3 Kf7 31. Rc1 Qb6 32. Qe6+ Kf8 33. Rc4 Re8 34. Qd7 a5 35. b5 Kf7 36. Qc7 Qa7 37. b6 Qa6 38. a4 Rd8 39. Nb5 Qa8 40. Re4 Re8 41. Nxd6+ Kf8 42. Nxb7 Qc8 43. Qxc8 Rxc8 44. d6 exd6 45. Nxd6 Rc6 46. b7 Rxd6 47. b8Q+ Kg7 48. Qxd6 f5 49. Re7+ Kh6 50. Qd7 g5 51. Rxh7+ Kg6 52. Qf7# 1-0

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "9.27"]
[White "Antonov, Andrey P"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "A36"]
[WhiteElo "2137"]
[BlackElo "1913"]
[PlyCount "72"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 c5 2. c4 Nc6 3. Nc3 e6 4. g3 d6 5. Bg2 Be7 6. Nge2 Nf6 7. 0-0 0-0 8. d3 a6 9. Rb1 Qc7 10. h3 b6 11. Be3 Bb7 12. f4 Rad8 13. Kh2 Rfe8 14. a3 Bf8 15. Bg1 Ne7 16. d4 d5 17. exd5 exd5 18. Qc2 dxc4 19. dxc5 Bxg2 20. Kxg2 b5 21. b3 cxb3 22. Qxb3 Ned5 23. Rb2 Ne3+ 24. Bxe3 Rxe3 25. Qc2 Qc6+ 26. Kh2 Bxc5 27. Rd1 Rxd1 28. Qxd1 h6 29. Qd8+ Kh7 30. Nd1 Re8 31. Qd3+ Kg8 32. Rc2 Qb6 33. g4 Bd6 34. Qf3 Bb8 35. Rc6 Rxe2+ 36. Qxe2 Qxc6 0-1

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "5.28"]
[White "Bellissimo, Joseph F"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "B40"]
[WhiteElo "2203"]
[BlackElo "1913"]
[PlyCount "102"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. c3 d5 4. e5 d4 5. Bd3 e6 6. 0-0 g6 7. Re1 Bg7 8. Qe2 Nge7 9. Na3 0-0 10. Nb5 Nd5 11. Be4 Nf4 12. Qf1 d3 13. g3 Ne2+ 14. Rxe2 dxe2 15. Qxe2 Nxe5 16. Nxe5 Bxe5 17. d3 Bg7 18. Be3 a6 19. Na3 Qc7 20. h4 h5 21. Nc4 Bd7 22. Bf4 e5 23. Bg5 b5 24. Bxa8 Rxa8 25. Nd2 Bc6 26. Re1 f5 27. d4 cxd4 28. cxd4 Re8 29. Rc1 Qd6 30. Qd3 Qd5 31. Qb3 Qxb3 32. Nxb3 Bd5 33. dxe5 Bxe5 34. Nc5 Bd4 35. Nxa6 Re2 36. Be3 Bxe3 37. Rc8+ Kg7 38. fxe3 Rg2+ 39. Kf1 Rxb2 40. Nc7 Be4 41. Ne6+ Kf6 42. Nd4 Rxa2 43. Rf8+ Ke5 44. Re8+ Kd5 45. Rg8 Kc4 46. Rxg6 Kd3 47. Nxb5 Kxe3 48. Ra6 Rxa6 49. Na3 Rxa3 50. Kg1 Ra1+ 51. Kh2 Rh1# 0-1

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "1.74"]
[White "Jundana, M Qudwah"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "A00"]
[BlackElo "1913"]
[PlyCount "54"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e3 Nf6 2. c3 g6 3. Nf3 Bg7 4. h3 0-0 5. Bd3 d6 6. Ng5 e5 7. Qc2 d5 8. e4 h6 9. Nf3 dxe4 10. Bxe4 Nxe4 11. Qxe4 Nc6 12. Qc2 Bf5 13. d3 Bxd3 14. Qd2 e4 15. Nd4 Nxd4 16. cxd4 Qxd4 17. Nc3 Rad8 18. Ne2 Qc4 19. Qe3 f5 20. a4 g5 21. g3 Qb4+ 22. Nc3 Bxc3+ 23. Bd2 Bxd2+ 24. Qxd2 Qd4 25. Qa5 e3 26. f3 Qxb2 27. Qd2 Qxd2# 0-1

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "6.14"]
[White "Koster, Chiel"]
[Black "Jirasek, Ladia R"]
[Result "0-1"]
[ECO "A00"]
[WhiteElo "1913"]
[BlackElo "2361"]
[PlyCount "146"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 d5 2. Nc3 d4 3. Nce2 e5 4. d3 f6 5. g3 Bg4 6. Bg2 Nc6 7. f3 Be6 8. f4 Qd7 9. Nf3 0-0-0 10. 0-0 Bg4 11. fxe5 fxe5 12. Ng5 Nf6 13. h3 Bh5 14. g4 Bg6 15. a3 h5 16. gxh5 Bxh5 17. Qe1 Bxe2 18. Qxe2 Kb8 19. Bd2 Bd6 20. Rf3 Rdf8 21. Raf1 Ne7 22. c4 Ng6 23. b4 Nh4 24. R3f2 Re8 25. c5 Be7 26. Bf3 Nxf3+ 27. Rxf3 Nh5 28. Nf7 Rh7 29. Nxe5 Qe6 30. Ng4 Rhh8 31. Qg2 Bh4 32. Bf4 a6 33. Bh2 Qb3 34. Rf7 Rc8 35. c6 b6 36. Ne5 Bf6 37. Nd7+ Ka7 38. Nxf6 Qxf7 39. Nd5 Qe6 40. Nxc7 Qxc6 41. Rf7 Qc1+ 42. Qf1 Qxf1+ 43. Kxf1 Rhf8 44. Nb5+ Ka8 45. Nc7+ Kb7 46. Rxf8 Rxf8+ 47. Ke2 Nf4+ 48. Bxf4 Rxf4 49. Ne6 Rh4 50. Nxg7 Rxh3 51. Nf5 Rh2+ 52. Kd1 Ra2 53. e5 Rxa3 54. e6 Kc7 55. Kc2 Ra2+ 56. Kb3 Rf2 57. Nxd4 Kd6 58. Kc4 Rf4 59. Kc3 a5 60. bxa5 bxa5 61. Nb3 a4 62. Nc1 Kxe6 63. Ne2 Rh4 64. d4 Rh2 65. Nc1 Kd5 66. Kb4 Rc2 67. Nd3 Kxd4 68. Nf4 Rc4+ 69. Ka3 Ke4 70. Ne6 Kd5 71. Nd8 Rc7 72. Kxa4 Rd7 73. Nb7 Rxb7 0-1

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "2.7"]
[White "Koster, Chiel"]
[Black "Laurusas, Tomas"]
[Result "0-1"]
[ECO "B40"]
[WhiteElo "1913"]
[BlackElo "2505"]
[PlyCount "96"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. g3 Nc6 4. Bg2 Nf6 5. d3 d5 6. exd5 Nxd5 7. 0-0 Be7 8. Bd2 0-0 9. Nc3 Nc7 10. Re1 b6 11. Ne5 Nd4 12. Ne2 Bf6 13. Nxd4 cxd4 14. Bb4 Re8 15. Nc6 Qd7 16. Ne5 Bxe5 17. Rxe5 Rb8 18. Qh5 Bb7 19. Bxb7 Rxb7 20. Rae1 Rbb8 21. Bd2 Rbc8 22. c4 dxc3 23. Bxc3 Nd5 24. Bd4 f6 25. R5e2 e5 26. Be3 Nb4 27. Rd1 Nxd3 28. Red2 e4 29. f3 f5 30. fxe4 fxe4 31. Rf1 Rf8 32. Rdd1 Qe6 33. Qh4 Ne5 34. Rxf8+ Rxf8 35. Kg2 Nf3 36. Qh5 Ne5 37. Qh4 Nc4 38. Bg1 e3 39. Qd4 e2 40. Re1 Re8 41. Qd3 h6 42. h4 Nxb2 43. Qd2 Nc4 44. Qd3 Nd6 45. Bd4 Nf5 46. Bb2 Qc6+ 47. Kh2 Qe6 48. Qc3 Qg6 0-1

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "8.47"]
[White "Koster, Chiel"]
[Black "Obeid, Omar"]
[Result "1-0"]
[ECO "A00"]
[WhiteElo "1913"]
[BlackElo "1327"]
[PlyCount "57"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 d5 2. Nc3 dxe4 3. Nxe4 Qd5 4. d3 Bf5 5. Ng3 Bg6 6. Be2 Nf6 7. Bf3 Qb5 8. a4 Qa6 9. N1e2 c6 10. Be3 e6 11. Qd2 Nbd7 12. 0-0 Bd6 13. b4 Nd5 14. b5 cxb5 15. axb5 Qxa1 16. Rxa1 0-0 17. c4 Bb4 18. Qb2 Nxe3 19. fxe3 Be7 20. Nf4 Bf6 21. d4 e5 22. Nd5 exd4 23. Nxf6+ Nxf6 24. exd4 Rfd8 25. c5 Nd5 26. Qb3 Nc7 27. Bxb7 Rab8 28. c6 Nd5 29. Rxa7 1-0

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "4.52"]
[White "Koster, Chiel"]
[Black "Souza, Igor Esquivel"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "1913"]
[PlyCount "47"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 d6 2. Nc3 Nf6 3. g3 g6 4. Bg2 Bg7 5. d3 0-0 6. Nge2 e5 7. 0-0 a6 8. a4 Nc6 9. Be3 Be6 10. h3 Qd7 11. Kh2 h5 12. f4 Kh7 13. Qd2 Rh8 14. fxe5 Nxe5 15. Bg5 Kg8 16. Bxf6 Bxf6 17. Rxf6 Qe7 18. Raf1 h4 19. Qg5 hxg3+ 20. Nxg3 Qd7 21. Nf5 Bxf5 22. exf5 Kg7 23. fxg6 fxg6 24. Ne4 1-0

[Event "FIDE World Uni Blitz-B 1st"]
[Site "Tornelo INT"]
[Date "2021.03.13"]
[Round "10.19"]
[White "Koster, Chiel"]
[Black "Styazhkina, Anna"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1913"]
[BlackElo "2294"]
[PlyCount "73"]
[EventDate "2021.03.13"]
[EventType "swiss (blitz)"]
[EventRounds "10"]
[EventCountry "NET"]
[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 d6 5. c3 Nf6 6. d4 Bb6 7. dxe5 dxe5 8. Qxd8+ Nxd8 9. Nbd2 0-0 10. a4 a6 11. b4 Nc6 12. Bb3 Bg4 13. h3 Bxf3 14. gxf3 Rad8 15. Nc4 Rfe8 16. Nxb6 cxb6 17. Rd1 b5 18. axb5 axb5 19. Bg5 h6 20. Bxf6 gxf6 21. Rxd8 Rxd8 22. Rd1 Kf8 23. Rxd8+ Nxd8 24. Kg2 b6 25. Bd5 Ke7 26. Kg3 Kf8 27. Kg4 Kg7 28. Kf5 h5 29. h4 Ne6 30. Bxe6 fxe6+ 31. Kxe6 Kg6 32. Kd6 Kf7 33. Kc6 Ke6 34. Kxb6 f5 35. Kxb5 fxe4 36. fxe4 Kd6 37. Kc4 1-0

[Event "Delft Prinsenstad op-B 9th"]
[Site "Delft"]
[Date "2016.03.27"]
[Round "6"]
[White "Van den Berg, Cees"]
[Black "Koster, Chiel"]
[Result "1/2-1/2"]
[ECO "B33"]
[WhiteElo "1928"]
[BlackElo "1795"]
[PlyCount "46"]
[EventDate "2016.03.27"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. a4 a6 8. Na3 Bg4 9. f3 Be6 10. Be3 d5 11. exd5 Nxd5 12. Nxd5 Qxd5 13. Qxd5 Bxd5 14. 0-0-0 Be6 15. Nc4 Rd8 16. Rxd8+ Kxd8 17. Be2 Be7 18. Rd1+ Kc8 19. Bb6 Bd8 20. Bc5 Bc7 21. Nb6+ Kb8 22. Nd7+ Kc8 23. Nb6+ Kb8 1/2-1/2

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.05.04"]
[Round "9"]
[White "Van Hoorn, Geert"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B00"]
[PlyCount "27"]
[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 b6 3. f4 Bb7 4. Bd3 f5 5. exf5 exf5 6. Nf3 g6 7. 0-0 Bg7 8. Bc4 Nc6 9. Re1+ Nce7 10. Ng5 Nh6 11. Nc3 d5 12. Ne6 Qd7 13. Bxd5 c6 14. Nxg7+ 1-0

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.05.03"]
[Round "8"]
[White "Koster, Chiel"]
[Black "Rijken, Jasper"]
[Result "0-1"]
[ECO "A01"]
[PlyCount "84"]
[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. b3 e5 2. Bb2 Nc6 3. e3 d6 4. Bb5 Nge7 5. Nf3 Bg4 6. Be2 Qd7 7. c4 g6 8. h3 Bf5 9. a3 Bg7 10. d3 0-0 11. Nfd2 Be6 12. 0-0 f5 13. f4 exf4 14. Bxg7 Kxg7 15. exf4 d5 16. Nf3 dxc4 17. bxc4 Nd4 18. Nc3 Nxf3+ 19. Bxf3 Qd4+ 20. Kh1 Qxc3 21. Re1 Rf6 22. d4 Rd8 23. d5 Ng8 24. Qa4 Bc8 25. Qxa7 Qxc4 26. Rac1 Qxf4 27. Qc5 Rf7 28. Rc4 Qd6 29. Qd4+ Nf6 30. Rec1 Kg8 31. Qh4 Re8 32. a4 Re5 33. Rd1 Nxd5 34. Bxd5 Rxd5 35. Rxd5 Qxd5 36. Rd4 Qc5 37. Rd1 Kg7 38. Qf4 Re7 39. Rc1 Qd5 40. Rxc7 Rxc7 41. Qxc7+ Bd7 42. Qc3+ Kg8 0-1

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.05.02"]
[Round "7"]
[White "Koster, Chiel"]
[Black "Den Dunnen, Lola"]
[Result "1/2-1/2"]
[ECO "A00"]
[BlackElo "1705"]
[PlyCount "105"]
[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. Nc3 d5 2. e4 dxe4 3. Nxe4 e5 4. Nf3 Nd7 5. Bc4 Be7 6. d4 exd4 7. Qe2 h6 8. 0-0 Ngf6 9. Nxf6+ Nxf6 10. Re1 Bg4 11. Bxf7+ Kxf7 12. Ne5+ Ke8 13. Nxg4 Nxg4 14. Qxg4 Kf7 15. Qe6+ Kf8 16. Bf4 Bg5 17. Bxg5 hxg5 18. Re5 Rh6 19. Rf5+ Rf6 20. Re1 Rxf5 21. Qxf5+ Qf6 22. Qc5+ Kg8 23. Qxc7 Rf8 24. Qc4+ Kh8 25. Rf1 d3 26. Qxd3 Qxb2 27. Qb3 Qxb3 28. axb3 Rd8 29. Rc1 Kg8 30. Kf1 Kf7 31. Ra1 a6 32. Ra2 Kf6 33. c4 Rd3 34. Rb2 Rc3 35. Ke2 Ke5 36. h3 b5 37. Ra2 Rxb3 38. Rxa6 bxc4 39. Rg6 Kd4 40. Kd2 Rb2+ 41. Kc1 Rxf2 42. Rxg5 Kc3 43. Rg3+ Kb4 44. Rxg7 Kb3 45. h4 Rf1+ 46. Kd2 c3+ 47. Ke2 Rh1 48. Rb7+ Kc2 49. g3 Kc1 50. Rc7 Rh2+ 51. Kf3 c2 52. Kg4 Kd1 53. h5 1/2-1/2

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.05.01"]
[Round "6"]
[White "Gerlagh, Joris"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "E68"]
[WhiteElo "2072"]
[PlyCount "43"]
[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. Nf3 d6 3. c4 Nbd7 4. Nc3 c6 5. g3 g6 6. Bg2 Bg7 7. 0-0 0-0 8. e4 e5 9. d5 cxd5 10. cxd5 Ne8 11. Bg5 f6 12. Be3 f5 13. Ng5 Ndf6 14. exf5 gxf5 15. Qb3 Qe7 16. Nb5 a6 17. Na7 h6 18. Nxc8 Rxc8 19. Ne6 Rf7 20. Rac1 Rxc1 21. Rxc1 b5 22. Rc6 1-0

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.04.30"]
[Round "5"]
[White "Stolwijk, Colin"]
[Black "Koster, Chiel"]
[Result "1/2-1/2"]
[ECO "B51"]
[WhiteElo "2100"]
[PlyCount "103"]
[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. Bb5 d6 4. 0-0 Bd7 5. c3 g6 6. d4 cxd4 7. cxd4 Bg7 8. Nc3 Nf6 9. Bf4 0-0 10. Qd2 Bg4 11. Rad1 Bxf3 12. gxf3 Nh5 13. Be3 f5 14. Bc4+ Kh8 15. Bh6 Qd7 16. Bxg7+ Kxg7 17. Qe3 e5 18. Bb5 a6 19. Bxc6 Qxc6 20. dxe5 dxe5 21. Qg5 Rf7 22. Nd5 h6 23. Qh4 Qe6 24. Kh1 fxe4 25. fxe4 Nf4 26. Rg1 Rc8 27. Nxf4 Rxf4 28. Qh5 g5 29. Qe2 Rcf8 30. Rg2 Qc6 31. Rd5 Qe6 32. Qc2 R8f7 33. a3 Qb6 34. Kg1 Rc7 35. Qd2 Rxe4 36. Rd7+ Rxd7 37. Qxd7+ Kg6 38. Qe8+ Kf6 39. Qh8+ Kg6 40. Qg8+ Kf6 41. h3 Qc7 42. Rg3 Rf4 43. Rd3 Qc1+ 44. Kg2 Qc6+ 45. Kg3 Rd4 46. Qh8+ Kg6 47. Rxd4 exd4 48. Qxd4 Qc7+ 49. Kf3 Qc6+ 50. Kg3 Qc7+ 51. Kg2 Qc6+ 52. Kg3 1/2-1/2

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.04.29"]
[Round "4"]
[White "Koster, Chiel"]
[Black "Lecomte, Robin"]
[Result "1/2-1/2"]
[ECO "B23"]
[BlackElo "2013"]
[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. e4 c5 2. Nc3 e6 3. f4 d5 4. d3 Nc6 5. Nf3 dxe4 6. Nxe4 Nf6 7. Be3 Nd5 8. Bd2 Be7 9. g3 0-0 10. Bg2 Qb6 11. c4 Ndb4 12. Nf2 Rd8 13. Bc3 Nd4 14. Nxd4 cxd4 15. Bd2 a5 16. 0-0 Bd7 17. Bxb4 Qxb4 18. Rb1 Rab8 19. a3 Qa4 20. Qxa4 Bxa4 21. b3 Bc6 22. a4 Bb4 23. Rb2 Ra8 24. Re2 Ra6 25. Rb2 Rb6 26. Rbb1 Bc3 27. Ne4 Rb4 28. Rfc1 Bxe4 29. Bxe4 Rd6 30. Kg2 Rdb6 31. c5 Ra6 32. Rc2 g6 33. g4 Kf8 34. f5 Ke7 35. Rf1 Rxb3 36. Rcf2 exf5 37. gxf5 Rf6 38. Re2 Rb2 39. Rxb2 Bxb2 40. Rb1 gxf5 41. Bf3 Ba3 42. Rxb7+ Kd8 43. c6 Bd6 44. h4 Rg6+ 45. Kf1 Bc7 46. Ra7 Rg3 47. Kf2 Rh3 48. Ra8+ Ke7 49. Rc8 Be5 50. Ra8 Bc7 51. Rc8 Be5 52. Ra8 Bc7 1/2-1/2

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.04.28"]
[Round "3"]
[White "Mensing, Adrian"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "B07"]
[PlyCount "82"]
[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 d6 2. d4 Nf6 3. Nc3 Nbd7 4. f4 e5 5. fxe5 dxe5 6. dxe5 Nxe5 7. Qxd8+ Kxd8 8. Bg5 c6 9. Nf3 Bd6 10. 0-0-0 Kc7 11. Bxf6 gxf6 12. Nd4 Bc5 13. Be2 Ng4 14. Rd2 Bf8 15. Bxg4 Bxg4 16. Rd3 Bh6+ 17. Kb1 Bf4 18. Rf1 Be5 19. h3 Be6 20. Nxe6+ fxe6 21. Rfd1 Rad8 22. Ne2 c5 23. Nc3 a6 24. Na4 Rxd3 25. cxd3 Kc6 26. Kc2 h5 27. Nc3 Rg8 28. Rd2 b5 29. b3 Kb6 30. a4 Ka5 31. Re2 Rg3 32. axb5 axb5 33. Nb1 Kb4 34. Nd2 Rg8 35. Nf3 Bc3 36. Nd2 Ra8 37. g4 hxg4 38. hxg4 e5 39. Nb1 Ra2+ 40. Kd1 Rxe2 41. Kxe2 Kxb3 0-1

[Event "NED-ch U17"]
[Site "Rotterdam"]
[Date "2014.04.27"]
[Round "2"]
[White "Koster, Chiel"]
[Black "Van Baar, Esper"]
[Result "1-0"]
[ECO "A28"]
[BlackElo "1851"]
[PlyCount "101"]
[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. c4 e5 2. Nc3 Nc6 3. d3 Nf6 4. Nf3 h6 5. e3 Bb4 6. Bd2 0-0 7. a3 Bxc3 8. Bxc3 Re8 9. Qc2 d5 10. Be2 d4 11. Bd2 Bf5 12. e4 Bg4 13. b4 a6 14. h3 Bxf3 15. Bxf3 Qd7 16. 0-0 Ne7 17. Kh2 Ng6 18. g3 Rad8 19. Bg2 Nh5 20. Qd1 Nf6 21. Be1 Nh7 22. f4 exf4 23. gxf4 c6 24. Bg3 Ra8 25. Rb1 Qe7 26. Qb3 Nf6 27. Bf3 Reb8 28. Rfe1 Nd7 29. e5 Rf8 30. Bg4 Kh7 31. Qb2 Rad8 32. Qf2 c5 33. e6 Nf6 34. Bf3 Ne8 35. f5 Nh8 36. Be4 Nf6 37. Bf3 Rde8 38. Qg2 b6 39. Re5 Kg8 40. bxc5 Rb8 41. exf7+ Qxf7 42. cxb6 Kh7 43. Ra5 Rbe8 44. b7 Nd7 45. Bc6 Nb8 46. Bxe8 Rxe8 47. Bxb8 Rxb8 48. Rxa6 Qxf5 49. Qe4 Qxe4 50. dxe4 d3 51. Ra8 1-0

[Event "NED-ch U16 op"]
[Site "Borne"]
[Date "2013.08.09"]
[Round "7"]
[White "Borm, Bart"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "C04"]
[WhiteElo "1393"]
[BlackElo "1674"]
[PlyCount "41"]
[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 e6 2. d4 d5 3. Nd2 Ne7 4. Ngf3 Nbc6 5. c3 Bd7 6. exd5 Nxd5 7. Nb3 Bd6 8. Bd3 Nf4 9. Bxf4 Bxf4 10. Nc5 Qc8 11. Qe2 0-0 12. Qe4 f5 13. Qxf4 Be8 14. Ng5 Rf6 15. Bc4 Bd7 16. Nxd7 Qxd7 17. 0-0 Nd8 18. Rfe1 Qc6 19. Bb3 Rg6 20. Qxf5 Kh8 21. Qf8# 1-0

[Event "NED-ch U16 op"]
[Site "Borne"]
[Date "2013.08.07"]
[Round "4"]
[White "Koster, Chiel"]
[Black "Roesink, Myron"]
[Result "1-0"]
[ECO "A00"]
[WhiteElo "1674"]
[BlackElo "1809"]
[PlyCount "129"]
[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. Nc3 d5 2. e4 d4 3. Nce2 c5 4. d3 Nc6 5. f4 e5 6. Nf3 Bg4 7. Ng3 Bd6 8. f5 h5 9. Be2 h4 10. Nf1 Nf6 11. N1d2 Nh5 12. Nc4 Bc7 13. Nxd4 Bxe2 14. Nxe2 h3 15. g3 b5 16. Ne3 Nd4 17. c3 Ba5 18. Bd2 Nf3+ 19. Kf2 Nxd2 20. Qxd2 Nf6 21. Rhd1 Bb6 22. c4 Qd6 23. Nc3 bxc4 24. dxc4 Qd4 25. Qe2 Nxe4+ 26. Nxe4 Qxe4 27. Qf3 Qxf3+ 28. Kxf3 f6 29. Nd5 Rd8 30. Rd3 Kf7 31. Rad1 g6 32. fxg6+ Kxg6 33. Ne7+ Kg5 34. Rxd8 Rxd8 35. Rd5 Re8 36. Rd7 Rd8 37. Rxd8 Bxd8 38. Nc8 a5 39. Nd6 Be7 40. Ne4+ Kg6 41. Nf2 f5 42. Nxh3 Bf6 43. Ke3 a4 44. b3 a3 45. Nf2 e4 46. Nh3 Bd4+ 47. Ke2 Be5 48. Nf2 Bd4 49. g4 fxg4 50. Nxg4 Kf5 51. Ne3+ Kf4 52. Nc2 Bg1 53. Nxa3 Bxh2 54. Nc2 Kf5 55. Ne3+ Ke6 56. Nd5 Ke5 57. a4 Kd4 58. a5 Bb8 59. a6 Ba7 60. Nc7 Kc3 61. Nb5+ Kb4 62. Nxa7 Ka5 63. Ke3 Kxa6 64. Kxe4 Kxa7 65. Kd5 1-0

[Event "NED-ch U16 op"]
[Site "Borne"]
[Date "2013.08.07"]
[Round "5"]
[White "Sanders, Laurens"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "B88"]
[WhiteElo "1030"]
[BlackElo "1674"]
[PlyCount "37"]
[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 c5 2. Nf3 Nc6 3. Bc4 d6 4. Nc3 Nf6 5. 0-0 Bd7 6. d4 cxd4 7. Nxd4 e6 8. Bg5 Be7 9. Re1 0-0 10. Nxc6 Bxc6 11. e5 dxe5 12. Qxd8 Raxd8 13. Rxe5 h6 14. Be3 Ng4 15. Ra5 Nxe3 16. fxe3 Rd2 17. e4 Rxc2 18. Rxa7 Bc5+ 19. Kh1 0-1

[Event "NED-ch U16 op"]
[Site "Borne"]
[Date "2013.08.06"]
[Round "2"]
[White "Koster, Chiel"]
[Black "Mollema, Thomas"]
[Result "0-1"]
[ECO "A10"]
[WhiteElo "1674"]
[BlackElo "2063"]
[PlyCount "48"]
[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. c4 f5 2. b3 Nf6 3. Bb2 g6 4. Nf3 Bg7 5. g3 0-0 6. Bg2 a5 7. Na3 Qe8 8. 0-0 d6 9. Nb5 Na6 10. a3 c6 11. Nc3 e5 12. Na4 Nd7 13. Qc2 Nc7 14. b4 Ne6 15. d3 g5 16. Nd2 Qh5 17. Bf3 g4 18. Bg2 f4 19. Rfe1 Rf6 20. Nc3 Rh6 21. Nf1 f3 22. Bh1 Ng5 23. exf3 Nh3+ 24. Kg2 gxf3# 0-1

[Event "NED-ch U16 op"]
[Site "Borne"]
[Date "2013.08.06"]
[Round "3"]
[White "Vermeulen, Dewi"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B22"]
[WhiteElo "1406"]
[BlackElo "1674"]
[PlyCount "91"]
[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 c5 2. Nf3 Nc6 3. c3 d6 4. d4 cxd4 5. cxd4 e6 6. Nc3 d5 7. exd5 exd5 8. Be3 Nf6 9. Bd3 Be7 10. 0-0 0-0 11. Rc1 Ng4 12. Bf4 Be6 13. Re1 h6 14. Qe2 Bd6 15. Bxd6 Qxd6 16. h3 Nf6 17. Qe3 Rfe8 18. Ne5 a6 19. Ne2 Bd7 20. Qf4 Nxe5 21. dxe5 Qxe5 22. Qb4 Bc6 23. Nd4 Qc7 24. Rxe8+ Rxe8 25. Bxa6 Qf4 26. Qc3 Ne4 27. Qe3 Qd6 28. Nxc6 bxc6 29. f3 d4 30. Qe2 Nf6 31. Qd3 Re3 32. Qd2 Nh5 33. Re1 Rxe1+ 34. Qxe1 Nf6 35. a4 c5 36. Bc4 d3 37. b3 d2 38. Qd1 Qd4+ 39. Kf1 Nh5 40. g4 Nf4 41. a5 Nxh3 42. Ke2 Nf2 43. Qxd2 Nh3 44. Qxd4 cxd4 45. a6 Nf4+ 46. Kd2 1-0

[Event "NED-ch U16 op"]
[Site "Borne"]
[Date "2013.08.05"]
[Round "1"]
[White "Joosten, Thijs"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "B50"]
[WhiteElo "1210"]
[BlackElo "1674"]
[PlyCount "22"]
[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 c5 2. Nf3 Nc6 3. Bc4 d6 4. h3 Nf6 5. d3 Bd7 6. Nc3 g6 7. Bf4 Bg7 8. 0-0 Na5 9. Bb3 Nxb3 10. axb3 0-0 11. Qd2 Re8 0-1

[Event "NED-ch U17"]
[Site "Sneek"]
[Date "2013.05.05"]
[Round "9"]
[White "Koster, Chiel"]
[Black "Zwirs, Jasper"]
[Result "1/2-1/2"]
[ECO "A00"]
[BlackElo "1937"]
[PlyCount "98"]
[EventDate "2013.04.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 c5 4. d3 Nc6 5. Nf3 Nf6 6. Ng3 h5 7. Bg5 Bg4 8. Be2 Qc7 9. h3 Bd7 10. h4 0-0-0 11. Qd2 Ng4 12. Nf1 f6 13. Bf4 e5 14. Bg3 g6 15. c3 Be6 16. c4 Bh6 17. Qc2 Rd6 18. N3d2 Nb4 19. Qb3 Rb6 20. a3 Nd5 21. Qc2 Nf4 22. Bxf4 exf4 23. Bxg4 hxg4 24. f3 f5 25. 0-0-0 Bd7 26. b3 Ra6 27. Kb2 Bg7 28. exf5 gxf5 29. fxg4 fxg4 30. Ne4 Bf5 31. Nfd2 Re8 32. Rhe1 Rae6 33. Ka2 Qd8 34. Rh1 f3 35. g3 Bh6 36. Nxc5 Re2 37. Nce4 Bxe4 38. dxe4 d3 39. Qc3 Bxd2 40. Rxd2 Rxd2+ 41. Qxd2 Rxe4 42. Kb1 Re2 43. Qf4 d2 44. Rd1 Qd3+ 45. Kb2 Re4 46. Qf8+ Kc7 47. Qg7+ Kc8 48. Qf8+ Kc7 49. Qg7+ Kc8 1/2-1/2

[Event "NED-ch U17"]
[Site "Sneek"]
[Date "2013.05.04"]
[Round "8"]
[White "Haver, Sjoerd"]
[Black "Koster, Chiel"]
[Result "0-1"]
[ECO "C04"]
[WhiteElo "1736"]
[PlyCount "68"]
[EventDate "2013.04.27"]
[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 e6 2. d4 d5 3. Nd2 Ne7 4. Ngf3 Nbc6 5. Bb5 Bd7 6. 0-0 a6 7. Ba4 g6 8. e5 Nxe5 9. Nxe5 Bxa4 10. Qf3 Nf5 11. b3 Bd7 12. c4 f6 13. Nxd7 Qxd7 14. cxd5 Qxd5 15. Qxd5 exd5 16. Re1+ Kf7 17. Nf3 Bb4 18. Rd1 Bd6 19. g4 Ng7 20. Be3 c6 21. Ne1 Ne6 22. Nd3 Rae8 23. a3 h5 24. gxh5 Rxh5 25. f4 Ng7 26. Bf2 Reh8 27. Bg3 Nf5 28. Nf2 g5 29. fxg5 Rxg5 30. Nh1 Bxg3 31. Nxg3 Nxg3 32. hxg3 Rxg3+ 33. Kf2 Rxb3 34. Rab1 Rhh3 0-1

[Event "NED-ch U17"]
[Site "Sneek"]
[Date "2013.05.03"]
[Round "7"]
[White "Koster, Chiel"]
[Black "Dubbeldam, Mathijs"]
[Result "0-1"]
[ECO "B00"]
[BlackElo "1320"]
[PlyCount "72"]
[EventDate "2013.04.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. Nc3 b6 2. d4 e6 3. e4 Bb7 4. Nf3 Bb4 5. Bd3 Ne7 6. Bd2 0-0 7. a3 Bxc3 8. Bxc3 f5 9. Qe2 fxe4 10. Bxe4 Bxe4 11. Qxe4 Nbc6 12. 0-0-0 Nd5 13. Bd2 Qf6 14. Be3 h6 15. c4 Nf4 16. Ne1 d5 17. Qc2 dxc4 18. Qxc4 Na5 19. Qc2 Nd5 20. Nd3 Rac8 21. Kb1 Qg6 22. g3 c5 23. dxc5 Nxe3 24. fxe3 bxc5 25. Nf4 Qxc2+ 26. Kxc2 e5 27. Nd3 e4 28. Nf4 Nc4 29. Rhe1 Rb8 30. Rb1 Rfd8 31. h4 Rd2+ 32. Kc3 Rdxb2 33. Rxb2 Nxb2 34. Ne6 Nd3 35. Rd1 a5 36. Kc4 Nb2+ 0-1

[Event "NED-ch U17"]
[Site "Sneek"]
[Date "2013.05.02"]
[Round "6"]
[White "Postema, Yorick"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "A31"]
[PlyCount "45"]
[EventDate "2013.04.27"]
[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 Nf6 2. Nf3 c5 3. d4 cxd4 4. Nxd4 e5 5. Nb3 Nc6 6. a3 d6 7. Bg5 Be7 8. Nc3 Be6 9. e3 Nd7 10. Bxe7 Qxe7 11. Nb5 0-0 12. Qxd6 Qxd6 13. Nxd6 b6 14. Rd1 a6 15. Nc1 Na5 16. b4 Nc6 17. Be2 f5 18. Nd3 Ne7 19. 0-0 Nc8 20. Nb2 a5 21. Nb5 Ne7 22. Nc7 Rac8 23. Nxe6 1-0

[Event "NED-ch U17"]
[Site "Sneek"]
[Date "2013.05.01"]
[Round "5"]
[White "Koster, Chiel"]
[Black "Reichardt, Monica"]
[Result "1-0"]
[ECO "B08"]
[PlyCount "113"]
[EventDate "2013.04.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. Nc3 d6 2. e4 Nf6 3. d4 g6 4. Nf3 Bg7 5. Bf4 c6 6. Qd2 Qc7 7. Bd3 0-0 8. 0-0-0 Re8 9. Bc4 e5 10. dxe5 dxe5 11. Bh6 b5 12. Bxg7 Kxg7 13. Bd3 a5 14. Ne2 Be6 15. Kb1 Qd6 16. Ng5 Nh5 17. Nxe6+ Qxe6 18. f3 Qd6 19. g4 Nf4 20. Nxf4 exf4 21. h4 Nd7 22. Qe2 Qd4 23. Bxb5 Qa7 24. Bxc6 Rad8 25. h5 Re6 26. Bxd7 Rxd7 27. hxg6 fxg6 28. Rxd7+ Qxd7 29. Qh2 Kg8 30. Qxf4 Rd6 31. Kc1 Qe6 32. Qe3 Qxa2 33. Qb3+ Qxb3 34. cxb3 Rd3 35. Rf1 Rxb3 36. Kc2 Re3 37. b3 Kf7 38. Kb2 Ke6 39. Ka3 Re2 40. Rh1 Rf2 41. Rh3 Kd6 42. Ka4 Kc5 43. Ka3 Rf1 44. Rxh7 Rxf3 45. Rg7 Rf6 46. Re7 Kd4 47. Ka4 Rb6 48. e5 Rb4+ 49. Ka3 Kd5 50. Ra7 Rb5 51. Ra6 Kxe5 52. Rxg6 Kf4 53. Rg8 Ke4 54. g5 Kd5 55. g6 Kc6 56. g7 Rg5 57. Rc8+ 1-0

[Event "NED-ch U17"]
[Site "Sneek"]
[Date "2013.04.30"]
[Round "4"]
[White "Van den Bergh, Dennis"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "A40"]
[PlyCount "143"]
[EventDate "2013.04.27"]
[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 e6 2. d4 b6 3. c4 Bb7 4. Nc3 c5 5. d5 d6 6. f4 Nd7 7. Nf3 Qb8 8. g3 Be7 9. Qa4 Qc7 10. Bh3 exd5 11. exd5 a6 12. Bd2 Bf6 13. 0-0-0 Ne7 14. Rhe1 Kd8 15. Qxd7+ Qxd7 16. Bxd7 Kxd7 17. Ne4 Ng8 18. Nfg5 Rf8 19. Re2 h6 20. Nf3 Bd8 21. Rde1 Ne7 22. Bc3 Rhg8 23. Ned2 b5 24. b3 Nc8 25. Nf1 Nb6 26. N3d2 g6 27. Ne3 f5 28. Ng2 Re8 29. Re6 Rxe6 30. Rxe6 bxc4 31. bxc4 Be7 32. Bf6 Bf8 33. Ne3 h5 34. Nb3 Nxc4 35. Nxc4 Bxd5 36. Re2 Bxc4 37. Rd2 Bxb3 38. axb3 Bg7 39. Bg5 Bc3 40. Ra2 a5 41. Kc2 Bb4 42. Kd3 Ke6 43. Re2+ Kd7 44. Re7+ Kc6 45. Re6 Be1 46. Rxe1 Rb8 47. Kc3 d5 48. Re6+ Kb5 49. Rxg6 Re8 50. Rf6 d4+ 51. Kd2 Re3 52. Rxf5 Rxb3 53. Be7 Rc3 54. Rxh5 a4 55. f5 Rf3 56. f6 a3 57. Bxc5 Kc4 58. Bxa3 Rxa3 59. Rf5 Ra2+ 60. Ke1 Kc3 61. f7 d3 62. f8Q Ra1+ 63. Kf2 Ra2+ 64. Kf3 d2 65. Qc5+ Kb2 66. Qd4+ Kc1 67. Rc5+ Kb1 68. Qd3+ Ka1 69. Re5 Ra4 70. Qxd2 Ra3+ 71. Qe3 Ra4 72. Ra5 1-0

[Event "NED-ch U17"]
[Site "Sneek"]
[Date "2013.04.29"]
[Round "3"]
[White "Damen, Jip"]
[Black "Koster, Chiel"]
[Result "1-0"]
[ECO "B59"]
[WhiteElo "1687"]
[PlyCount "127"]
[EventDate "2013.04.27"]
[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 d6 6. Be2 e5 7. Nb3 Be6 8. Be3 Be7 9. f3 d5 10. exd5 Nxd5 11. Nxd5 Bxd5 12. 0-0 f6 13. Qe1 0-0 14. Rd1 Nd4 15. Nxd4 exd4 16. Bxd4 Bf7 17. Kh1 Qc7 18. Bd3 Rfe8 19. Qh4 f5 20. Qh3 g6 21. f4 Qc6 22. Rf3 Bf6 23. Bxf6 Qxf6 24. b3 Rad8 25. Qg3 Qd4 26. Qf2 Re4 27. Qxd4 Rdxd4 28. Rdf1 Re7 29. Kg1 Rd8 30. R3f2 a6 31. Rd1 Re3 32. Kf1 Rd4 33. Re1 Rxe1+ 34. Kxe1 Kf8 35. Kd2 Rd6 36. Re2 Bd5 37. g3 Kf7 38. Kc3 Kf6 39. Rd2 Be6 40. Be2 Rc6+ 41. Kb4 Bc8 42. c4 Ke7 43. Bf3 Rd6 44. Rxd6 Kxd6 45. Bd5 h6 46. h4 b6 47. Bf7 Kc6 48. Bxg6 a5+ 49. Kc3 Kc5 50. a3 Bd7 51. b4+ axb4+ 52. axb4+ Kd6 53. Kd4 Ke6 54. c5 b5 55. Bh5 Bc6 56. Ke3 Kf6 57. Bf3 Bxf3 58. Kxf3 h5 59. Ke3 Ke7 60. Kd3 Kd7 61. Kd4 Ke6 62. c6 Kd6 63. c7 Kxc7 64. Kc5 1-0

