[Event "Hoorn Romero op"]
[Site "Hoorn"]
[Date "2023.09.02"]
[Round "1"]
[White "Kelder, Sjoerd"]
[Black "Pronk, Sven"]
[Result "0-1"]
[ECO "B13"]
[WhiteElo "1997"]
[BlackElo "2074"]
[PlyCount "85"]
[EventDate "2023.09.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Nf3 Nf6 5. Ne5 Nc6 6. Bb5 Bd7 7. Nxd7 Qxd7 8. c3 a6 9. Bd3 g6 10. 0-0 Bg7 11. Re1 0-0 12. Nd2 Nh5 13. Nf3 Qd6 14. Bf1 Rfe8 15. Be3 b5 16. g3 Rab8 17. a4 bxa4 18. Rxa4 a5 19. Qa1 Rb7 20. Bg2 e6 21. Ne5 Nxe5 22. dxe5 Bxe5 23. Rxa5 Reb8 24. Bc5 Qc7 25. b4 Bg7 26. Qa3 Nf6 27. c4 dxc4 28. Bxb7 Qxb7 29. Ra7 Qd5 30. Qa4 c3 31. Rd1 Qf3 32. Rxf7 Kxf7 33. Qa7+ Rb7 34. Qa4 Nd5 35. Re1 Nf6 36. Re3 Qf5 37. Rxc3 Qb1+ 38. Kg2 Qe4+ 39. f3 Qe2+ 40. Bf2 Ng4 41. Qc2 Qxf2+ 42. Qxf2 Nxf2 43. Kxf2 0-1

[Event "Amsterdam Science Park op-A"]
[Site "Amsterdam"]
[Date "2014.07.06"]
[Round "2"]
[White "Kelder, Sjoerd"]
[Black "Kohler, Aran"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "2018"]
[BlackElo "2222"]
[PlyCount "50"]
[EventDate "2014.07.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 161 Extra"]
[Source "ChessBase"]
[SourceDate "2014.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2014.08.29"]
[SourceQuality "1"]

1. f4 d5 2. Nf3 Nf6 3. g3 Nc6 4. Bg2 Bg4 5. Ne5 Nxe5 6. fxe5 Nd7 7. d4 e6 8. c4 c6 9. c5 b6 10. cxb6 axb6 11. Nc3 Be7 12. 0-0 0-0 13. Rf4 Bh5 14. Qf1 f6 15. Bh3 f5 16. Bg2 g5 17. Rf2 b5 18. e3 b4 19. Ne2 c5 20. Bf3 Bxf3 21. Rxf3 Qb6 22. Kg2 Rfc8 23. Bd2 cxd4 24. exd4 Rc2 25. Bc1 Qxd4 0-1

[Event "Amsterdam Science Park op-B 3rd"]
[Site "Amsterdam"]
[Date "2013.07.14"]
[Round "9"]
[White "Kelder, Sjoerd"]
[Black "Van Veelen, Jouke"]
[Result "1-0"]
[ECO "D44"]
[WhiteElo "1950"]
[BlackElo "1899"]
[PlyCount "73"]
[EventDate "2013.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. exf6 Bb7 12. g3 c5 13. d5 Qb6 14. Bg2 0-0-0 15. 0-0 b4 16. Na4 Qb5 17. a3 exd5 18. axb4 cxb4 19. Be3 Nc5 20. Nxc5 Bxc5 21. Bxc5 Qxc5 22. Qg4+ Kb8 23. Qg7 Qf8 24. Ra5 Qxg7 25. fxg7 Rhg8 26. Rd1 Rxg7 27. Rb5 c3 28. Rxb4 c2 29. Rc1 Rc8 30. Bxd5 f6 31. Kf1 Rd8 32. Bb3 a5 33. Rb5 Ka7 34. Rxa5+ Ba6+ 35. Kg1 Rb7 36. Bxc2 Rc8 37. Rxa6+ 1-0

[Event "Amsterdam Science Park op-B 3rd"]
[Site "Amsterdam"]
[Date "2013.07.13"]
[Round "8"]
[White "Kelder, Sjoerd"]
[Black "Keetman, Maaike"]
[Result "1-0"]
[ECO "A12"]
[WhiteElo "1950"]
[BlackElo "1988"]
[PlyCount "55"]
[EventDate "2013.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. c4 c6 2. Nf3 Nf6 3. g3 d5 4. Bg2 Bf5 5. b3 e6 6. 0-0 Nbd7 7. Bb2 Be7 8. d3 0-0 9. h3 h6 10. a3 a5 11. Re1 Qb6 12. Nc3 Bh7 13. Qc2 Bd6 14. Na4 Qa7 15. Bd4 c5 16. Be3 Rac8 17. Rec1 Rfd8 18. Bd2 d4 19. Rcb1 Rb8 20. b4 b6 21. Be1 Rdc8 22. bxa5 bxa5 23. Nd2 Bc7 24. Nb3 e5 25. Nd2 Re8 26. Rxb8 Bxb8 27. Rb1 Bc7 28. Rb7 1-0

[Event "Amsterdam Science Park op-B 3rd"]
[Site "Amsterdam"]
[Date "2013.07.10"]
[Round "5"]
[White "Veltkamp, Bastiaan"]
[Black "Kelder, Sjoerd"]
[Result "1-0"]
[ECO "D03"]
[WhiteElo "2045"]
[BlackElo "1950"]
[PlyCount "73"]
[EventDate "2013.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. Bg5 Ne4 4. Nbd2 Nxg5 5. Nxg5 e5 6. Ngf3 exd4 7. Nxd4 Be7 8. e3 0-0 9. Bd3 Nd7 10. 0-0 Nf6 11. Nf5 Bc5 12. Qf3 g6 13. Ng3 c6 14. h3 Nd7 15. Qf4 Qf6 16. Qxf6 Nxf6 17. Rae1 Bd6 18. e4 Bxg3 19. fxg3 Kg7 20. exd5 Nxd5 21. Ne4 Bf5 22. Bc4 Bxe4 23. Rxe4 f5 24. Re6 Nb6 25. Bb3 Rfe8 26. Rfe1 Kf8 27. Rf6+ Kg7 28. Rf7+ Kh6 29. Rxe8 Rxe8 30. Rxb7 Ra8 31. Rc7 Nd5 32. Rxc6 Ne3 33. Re6 Nd1 34. Re1 Rd8 35. Kf1 Kg5 36. Ke2 Nxb2 37. Rb1 1-0

[Event "Amsterdam Science Park op-B 3rd"]
[Site "Amsterdam"]
[Date "2013.07.09"]
[Round "4"]
[White "Kelder, Sjoerd"]
[Black "Van den Bergh, Jan"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "1950"]
[BlackElo "1967"]
[PlyCount "50"]
[EventDate "2013.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. e4 Nf6 2. Nc3 d6 3. d4 g6 4. Be2 Bg7 5. h4 h5 6. Nh3 Nc6 7. f3 Bxh3 8. Rxh3 e5 9. d5 Nd4 10. Bb5+ Nxb5 11. Nxb5 a6 12. Nc3 c5 13. Be3 Bh6 14. Bxh6 Rxh6 15. Qd2 Rh8 16. a4 Kf8 17. a5 Kg7 18. Na4 Nd7 19. b3 b5 20. axb6 Nxb6 21. Qa5 Nxa4 22. Qxd8 Rhxd8 23. Rxa4 Rdb8 24. Kd2 Rb4 25. Ra5 f5 1/2-1/2

[Event "Amsterdam Science Park op-B 3rd"]
[Site "Amsterdam"]
[Date "2013.07.08"]
[Round "3"]
[White "Kelder, Sjoerd"]
[Black "Van Nieuwkerk, Ton"]
[Result "1-0"]
[ECO "A16"]
[WhiteElo "1950"]
[BlackElo "1800"]
[PlyCount "67"]
[EventDate "2013.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. Nf3 g6 5. g3 Bg7 6. Bg2 0-0 7. 0-0 Nxc3 8. bxc3 Nd7 9. d4 c5 10. e4 Qa5 11. Qb3 cxd4 12. cxd4 Qb6 13. Rb1 Qxb3 14. Rxb3 e5 15. Bb2 exd4 16. Bxd4 Bxd4 17. Nxd4 Nc5 18. Rc3 b6 19. e5 Ba6 20. Rfc1 Rad8 21. Nc6 Rd2 22. Ra3 Nd3 23. Rb1 Bb7 24. Ne7+ Kg7 25. Bxb7 Nxf2 26. Bg2 Ng4 27. Nc6 Rc8 28. h3 Nf2 29. Rxa7 Nxh3+ 30. Bxh3 Rxc6 31. e6 Kf8 32. e7+ Ke8 33. Re1 f5 34. Ra8+ 1-0

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.27"]
[Round "10"]
[White "Kelder, Sjoerd"]
[Black "Tandrup, Michael"]
[Result "1/2-1/2"]
[ECO "B01"]
[BlackElo "1969"]
[PlyCount "98"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. b4 Qxb4 5. Rb1 Qd6 6. Nf3 Nf6 7. Rb3 c6 8. Ba3 Qc7 9. Bc4 e6 10. Bxf8 Kxf8 11. Qe2 Nbd7 12. 0-0 Nb6 13. Re1 Nxc4 14. Qxc4 h6 15. Nb5 Qe7 16. Nbd4 g6 17. Nxc6 Qc7 18. Qd4 Kg7 19. Nce5 Rd8 20. Qa1 Rd5 21. c4 Rd6 22. Nh4 g5 23. Nhf3 Kg8 24. h4 g4 25. Nh2 h5 26. Nf1 b6 27. Ng3 Bb7 28. Qc1 Qe7 29. d4 Nh7 30. Qh6 Qf8 31. Qxh5 Rxd4 32. Nxg4 Qg7 33. Nh6+ Kf8 34. c5 Bd5 35. Rbe3 bxc5 36. f3 Nf6 37. Qg5 Qxg5 38. hxg5 Ng8 39. Ng4 Rb8 40. Ne5 Rb2 41. Nd7+ Ke8 42. Nxc5 Rdd2 43. R3e2 Rxe2 44. Nxe2 Rxa2 45. Nc3 Ra5 46. Nxd5 Rxc5 47. Nb4 Rxg5 48. Ra1 Nf6 49. Rxa7 Rc5 1/2-1/2

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.26"]
[Round "9"]
[White "Kelder, Sjoerd"]
[Black "Jensen, Ib Vagn Norgaard"]
[Result "1/2-1/2"]
[ECO "A10"]
[BlackElo "2005"]
[PlyCount "32"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 Nc6 2. g3 d5 3. cxd5 Qxd5 4. Nf3 Nf6 5. Bg2 Qh5 6. Nc3 Bh3 7. 0-0 0-0-0 8. Qa4 e5 9. Qh4 Qxh4 10. Nxh4 Bxg2 11. Kxg2 Bc5 12. d3 Nd5 13. Nxd5 Rxd5 14. Nf5 g6 15. Ne3 Rd7 16. Nc2 Nd4 1/2-1/2

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.25"]
[Round "8"]
[White "Nielsen, Jens Holm"]
[Black "Kelder, Sjoerd"]
[Result "0-1"]
[ECO "B06"]
[WhiteElo "1943"]
[PlyCount "106"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. f4 c6 2. Nf3 g6 3. e4 Bg7 4. c3 d5 5. e5 h5 6. d4 Nh6 7. Bd3 Bf5 8. Na3 Na6 9. b4 Nc7 10. Nc2 Bxd3 11. Qxd3 Nf5 12. Ne3 Nxe3 13. Bxe3 e6 14. 0-0 a5 15. a3 Ra6 16. Rab1 axb4 17. axb4 0-0 18. Ra1 Qa8 19. Rxa6 Qxa6 20. Qxa6 Nxa6 21. h3 Nc7 22. Ra1 Ra8 23. Rxa8+ Nxa8 24. g4 hxg4 25. hxg4 Nb6 26. f5 gxf5 27. gxf5 Nc4 28. fxe6 fxe6 29. Bc1 Kf7 30. Kf2 Kg6 31. Ke2 Bf8 32. Kd3 Be7 33. Ne1 Bh4 34. Nc2 Kf5 35. Na1 Kg4 36. Nb3 b6 37. Bh6 Be1 38. Bf8 Nb2+ 39. Kc2 Na4 40. Na5 bxa5 41. bxa5 Bxc3 42. Kb3 Bxa5 43. Kxa4 Bb6 44. Bc5 Bxc5 45. dxc5 d4 46. Ka5 d3 47. Kb6 d2 48. Kxc6 d1Q 49. Kc7 Qd5 50. c6 Qxe5+ 51. Kb7 Qd5 52. Kb6 e5 53. c7 Qd6+ 0-1

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.24"]
[Round "7"]
[White "Kelder, Sjoerd"]
[Black "Nordin, Eric"]
[Result "0-1"]
[ECO "A36"]
[BlackElo "1991"]
[PlyCount "48"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. e3 e6 6. Nge2 Nge7 7. 0-0 0-0 8. d4 cxd4 9. Nxd4 Qb6 10. Ndb5 d5 11. Na4 Qd8 12. c5 Qa5 13. Nd6 b5 14. cxb6 axb6 15. Nxc8 Rfxc8 16. Nc3 Bxc3 17. bxc3 Qxc3 18. Rb1 Rxa2 19. Rxb6 Rc2 20. Ba3 Ra8 21. Bxe7 Nxe7 22. Rb7 Nf5 23. Rd7 Raa2 24. Rd8+ Kg7 0-1

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.23"]
[Round "6"]
[White "Hollesen, Kurt"]
[Black "Kelder, Sjoerd"]
[Result "1/2-1/2"]
[ECO "A19"]
[WhiteElo "1996"]
[PlyCount "81"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. e4 c5 4. e5 Ng8 5. d4 cxd4 6. Qxd4 Nc6 7. Qe4 d6 8. Nf3 Nxe5 9. Nxe5 dxe5 10. Qxe5 Qd6 11. Qe4 Nf6 12. Qf3 Qe5+ 13. Be2 Bb4 14. Bd2 0-0 15. 0-0 Bd6 16. g3 Qc5 17. Nb5 Bb8 18. Qb3 Qf5 19. Bb4 Re8 20. Qf3 Qxf3 21. Bxf3 a6 22. Nd6 Bxd6 23. Bxd6 e5 24. Rfe1 e4 25. Bg2 Bd7 26. Bf4 h6 27. Rad1 Bc6 28. Bc7 Ng4 29. Rd4 f5 30. Bh3 Ne5 31. Bxe5 Rxe5 32. Bg2 Rae8 33. Rd6 a5 34. b3 Kf8 35. h3 R5e6 36. Rd4 Re5 37. h4 g5 38. hxg5 hxg5 39. Rd6 R5e6 40. Rd4 Kf7 41. a3 1/2-1/2

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.22"]
[Round "5"]
[White "Dalberg, Preben"]
[Black "Kelder, Sjoerd"]
[Result "1-0"]
[ECO "D36"]
[WhiteElo "2097"]
[PlyCount "71"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. d4 d5 4. cxd5 exd5 5. Bg5 Be7 6. e3 c6 7. Qc2 Bg4 8. f3 Bh5 9. Bh4 Bg6 10. Qd2 0-0 11. Nh3 Re8 12. Bf2 c5 13. Be2 Nc6 14. Nf4 cxd4 15. exd4 Rc8 16. 0-0 Bb4 17. Rac1 Na5 18. Nxg6 hxg6 19. Bb5 Re7 20. Bh4 Rec7 21. Rfe1 Qf8 22. Bg3 Bxc3 23. bxc3 Re7 24. Re5 Rxe5 25. dxe5 Qc5+ 26. Bf2 Qxb5 27. exf6 gxf6 28. Qf4 Kg7 29. Bd4 Rc6 30. g4 Qd3 31. g5 Qf5 32. Bxf6+ Kg8 33. Re1 Rxf6 34. Re8+ Kg7 35. gxf6+ Kxf6 36. Qd4+ 1-0

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.21"]
[Round "4"]
[White "Kelder, Sjoerd"]
[Black "Christiansen, Erling"]
[Result "1/2-1/2"]
[ECO "A21"]
[BlackElo "2008"]
[PlyCount "120"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 c5 3. g3 d6 4. d3 f5 5. Bg2 Nf6 6. Bg5 Be7 7. Rb1 Nc6 8. e3 0-0 9. Nge2 Rb8 10. 0-0 Be6 11. Bxf6 Bxf6 12. Nd5 Qd7 13. Nec3 Kh8 14. a3 Ne7 15. Nxe7 Qxe7 16. Nd5 Qd7 17. b4 b6 18. b5 g6 19. a4 Bxd5 20. Bxd5 Bd8 21. Qd2 Bc7 22. f4 Qg7 23. Qb2 Rbe8 24. Rbe1 Bd8 25. Bc6 Re7 26. e4 exf4 27. Qxg7+ Kxg7 28. Rxf4 fxe4 29. Rfxe4 Ref7 30. Re6 Rf6 31. Kg2 Rxe6 32. Rxe6 Rf6 33. Re8 Rf8 34. Rxf8 Kxf8 35. Kf3 Ke7 36. Ke4 h6 37. Bd5 Kd7 38. Bf7 g5 39. Kf5 Be7 40. Be6+ Ke8 41. Ke4 Kd8 42. Kd5 Kc7 43. Bg4 Bf6 44. Ke6 Bd4 45. Bh5 Bg1 46. h3 Bh2 47. g4 Kd8 48. Kf6 Kd7 49. Bf7 Be5+ 50. Kg6 Ke7 51. Bd5 Bd4 52. Kxh6 Kf6 53. Kh7 Bf2 54. Kg8 Ke7 55. Kg7 Be3 56. Kg6 Bf4 57. Kg7 Bd2 58. h4 gxh4 59. g5 h3 60. Kg6 h2 1/2-1/2

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.20"]
[Round "3"]
[White "Boje, Tobias R"]
[Black "Kelder, Sjoerd"]
[Result "0-1"]
[ECO "B24"]
[WhiteElo "1979"]
[PlyCount "78"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. g3 Nc6 4. Bg2 Nge7 5. d3 g6 6. Be3 d6 7. Qd2 h5 8. Nge2 Bg7 9. h3 Bd7 10. 0-0 Nd4 11. Nd1 Bc6 12. c3 Nxe2+ 13. Qxe2 Qc7 14. Qd2 b6 15. d4 Qb7 16. f3 0-0-0 17. a4 h4 18. g4 f5 19. Qc2 e5 20. d5 Bd7 21. Nf2 Rdf8 22. a5 b5 23. a6 Qc7 24. Rfd1 Bh6 25. Bxh6 Rxh6 26. Qe2 fxg4 27. fxg4 g5 28. Nd3 c4 29. Rf1 Rhf6 30. Rxf6 Rxf6 31. Nf2 Qb6 32. Rf1 Ng6 33. Qc2 Nf4 34. b4 Qe3 35. Kh1 Ne2 36. Re1 Rxf2 37. Rg1 Rxg2 38. Kxg2 Qxg1+ 39. Kf3 Nf4 0-1

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.20"]
[Round "2"]
[White "Kelder, Sjoerd"]
[Black "Blomstrom, Lars"]
[Result "0-1"]
[ECO "A16"]
[BlackElo "2197"]
[PlyCount "76"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 0-0 5. d3 e5 6. Rb1 a5 7. a3 d6 8. e3 Nc6 9. Nge2 Be6 10. b4 axb4 11. axb4 d5 12. b5 Na5 13. cxd5 Nxd5 14. 0-0 f5 15. Ba3 Rf7 16. Nxd5 Bxd5 17. Bxd5 Qxd5 18. Bb4 b6 19. Nc3 Qd7 20. Qf3 Re8 21. Bxa5 bxa5 22. Qc6 Qxc6 23. bxc6 Re6 24. Nd5 Rxc6 25. Rfc1 Rxc1+ 26. Rxc1 Rd7 27. e4 a4 28. Rc4 a3 29. Ra4 c6 30. Nb4 Bf8 31. Nxc6 Rxd3 32. Nxe5 Rd2 33. exf5 a2 34. Kg2 gxf5 35. Nf3 Rb2 36. Ne5 Rc2 37. Nf3 Rc3 38. Ne5 Ra3 0-1

[Event "Politiken Cup 30th"]
[Site "Helsingor"]
[Date "2008.07.19"]
[Round "1"]
[White "Reyer, Ulli"]
[Black "Kelder, Sjoerd"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "2178"]
[PlyCount "30"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "DEN"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. c3 Nc6 4. d4 d5 5. exd5 Qxd5 6. Be3 cxd4 7. cxd4 Bb4+ 8. Nc3 Nf6 9. a3 Bxc3+ 10. bxc3 0-0 11. c4 Qa5+ 12. Qd2 Qxd2+ 13. Bxd2 e5 14. d5 e4 15. Ng1 Nd4 1/2-1/2

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.05"]
[Round "1"]
[White "Bezemer, Arno J"]
[Black "Kelder, Sjoerd"]
[Result "1-0"]
[ECO "B14"]
[WhiteElo "2346"]
[PlyCount "53"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Nf3 Be7 8. c5 Ne4 9. Bxe7 Kxe7 10. Bd3 Nxc3 11. bxc3 Qa5 12. Qc1 h6 13. 0-0 b6 14. a4 bxc5 15. Bb5 Qc7 16. Qa3 Bd7 17. Rfe1 a6 18. Bf1 Rhd8 19. c4 Nb4 20. Rac1 Qa5 21. dxc5 Qxa4 22. Qb2 a5 23. Qxg7 Rg8 24. Qxh6 dxc4 25. Rxc4 Bb5 26. Rxe6+ Kd8 27. Qf6+ 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.03"]
[Round "3"]
[White "Kelder, Sjoerd"]
[Black "Schuil, Jeroen"]
[Result "0-1"]
[ECO "C63"]
[PlyCount "108"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Bxc6 dxc6 5. Qe2 fxe4 6. Qxe4 Nf6 7. Qxe5+ Be7 8. d3 0-0 9. Be3 Ng4 10. Qd4 Qe8 11. Qc4+ Kh8 12. Nbd2 Bf6 13. 0-0-0 Nxe3 14. fxe3 Qxe3 15. Kb1 Be6 16. Qb4 a5 17. Qa3 Qf4 18. Ne4 Bd5 19. Rde1 Qg4 20. Nxf6 Rxf6 21. Rhg1 Qb4 22. Qxb4 axb4 23. b3 c5 24. Re7 Rc8 25. Kb2 Kg8 26. Ne1 Kf8 27. Re2 Ra8 28. Nf3 Bxf3 29. gxf3 Rxf3 30. Re5 b6 31. Reg5 g6 32. Rh1 Re8 33. h4 Rf5 34. Rhg1 Ree5 35. Rxf5+ Rxf5 36. Rg4 Kf7 37. a3 bxa3+ 38. Kxa3 h5 39. Re4 g5 40. hxg5 Rxg5 41. Re2 h4 42. Kb2 h3 43. Rh2 Rh5 44. Kc3 Kf6 45. Kd2 Kf5 46. Ke3 Kg4 47. Kf2 Rf5+ 48. Kg1 Re5 49. Kf2 b5 50. Rh1 Rf5+ 51. Kg1 Kg3 52. Rh2 Rf1+ 53. Kxf1 Kxh2 54. Kf2 b4 0-1

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.03"]
[Round "4"]
[White "Zilverberg, Jasper"]
[Black "Kelder, Sjoerd"]
[Result "1/2-1/2"]
[ECO "E94"]
[PlyCount "94"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3 Nf6 5. Be2 0-0 6. Nf3 e5 7. 0-0 Nbd7 8. dxe5 dxe5 9. b3 Nc5 10. Qc2 c6 11. Ba3 Qa5 12. Nb5 Nfxe4 13. b4 Qa4 14. Bd1 cxb5 15. bxc5 Qxa3 16. Qxe4 Bf5 17. Qe3 Qxe3 18. fxe3 e4 19. Nd4 Bxd4 20. exd4 Rfd8 21. cxb5 Rxd4 22. Bb3 Re8 23. c6 bxc6 24. bxc6 Re7 25. g4 Be6 26. Bxe6 Rxe6 27. Rfc1 Rd8 28. c7 Rc8 29. Rab1 Rb6 30. Rxb6 axb6 31. Kf2 Kf8 32. Ke3 Ke7 33. Kxe4 Kd6 34. h4 f6 35. Rf1 Ke6 36. Rb1 Rxc7 37. Rxb6+ Kf7 38. Rb4 Ra7 39. a4 Ra5 40. Kd4 f5 41. g5 Ke6 42. Rb6+ Kf7 43. Rb4 Ke6 44. Ke3 Kf7 45. Kf4 Ke6 46. Rb7 Rxa4+ 47. Kg3 Ra3+ 1/2-1/2

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.02"]
[Round "2"]
[White "Grannetia, Caspar"]
[Black "Kelder, Sjoerd"]
[Result "0-1"]
[ECO "A15"]
[PlyCount "40"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. d3 0-0 5. Nf3 c6 6. Nc3 d5 7. cxd5 cxd5 8. Bf4 Nc6 9. 0-0 a6 10. a3 b5 11. b4 Bb7 12. Rc1 e6 13. Be3 Rc8 14. Bc5 Re8 15. Bh3 Nd7 16. Be3 d4 17. Bd2 dxc3 18. Bxc3 Bxc3 19. Rxc3 Nd4 20. Qc1 Rxc3 0-1

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.02"]
[Round "1"]
[White "Kelder, Sjoerd"]
[Black "Galje, Hans"]
[Result "0-1"]
[ECO "C00"]
[BlackElo "2107"]
[PlyCount "115"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 e6 2. Qe2 c5 3. g3 Nc6 4. Nf3 g6 5. Bg2 Bg7 6. 0-0 Nge7 7. c3 0-0 8. d3 d6 9. Be3 Rb8 10. d4 cxd4 11. Nxd4 Nxd4 12. Bxd4 Bxd4 13. cxd4 b5 14. b4 Qb6 15. Qb2 Nc6 16. Rd1 Bd7 17. Na3 a5 18. Nc2 axb4 19. d5 Ne5 20. Qxb4 Qc5 21. Qxc5 dxc5 22. Ne3 c4 23. Bf1 Nf3+ 24. Kg2 Ng5 25. f3 exd5 26. Nxd5 Bh3+ 27. Kf2 Bxf1 28. Rxf1 Kg7 29. f4 Nxe4+ 30. Ke3 Nc5 31. Rab1 Rfd8 32. Nb4 Rd6 33. Rfd1 Re8+ 34. Kf3 Red8 35. Rxd6 Rxd6 36. Rb2 Ne6 37. Ke4 Rd4+ 38. Ke3 Rd1 39. Ke2 Rh1 40. Ke3 Kf8 41. Nd5 Re1+ 42. Kd2 Rh1 43. Ke3 Ke8 44. Rxb5 Rxh2 45. a4 Rg2 46. Rb4 Rxg3+ 47. Kf2 Rd3 48. Nb6 c3 49. Rc4 Nd4 50. a5 Nb5 51. a6 Rd2+ 52. Ke1 Ra2 53. Na4 Kd8 54. Kd1 h5 55. Kc1 h4 56. Kb1 Ra3 57. Nc5 Rxa6 58. Nxa6 0-1

[Event "IECG CN.2002.0.00279 email"]
[Site "IECG email"]
[Date "2002.01.29"]
[Round "?"]
[White "Glaba, Marvin"]
[Black "Kelder, Sjoerd"]
[Result "1-0"]
[ECO "E41"]
[WhiteElo "800"]
[BlackElo "800"]
[PlyCount "21"]
[EventDate "2002.01.29"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 d5 5. Nf3 c5 6. a3 cxd4 7. axb4 dxc3 8. bxc3 0-0 9. Bb2 Nc6 10. Be2 Qc7 11. cxd5 1-0

[Event "IECG CN.2002.0.00279 email"]
[Site "IECG email"]
[Date "2002.01.29"]
[Round "?"]
[White "Houglan, Rob"]
[Black "Kelder, Sjoerd"]
[Result "0-1"]
[ECO "C17"]
[WhiteElo "800"]
[BlackElo "800"]
[PlyCount "20"]
[EventDate "2002.01.29"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Qg4 Ne7 6. Qxg7 Rg8 7. Qxh7 cxd4 8. Qh4 Nbc6 9. a3 Qa5 10. Bd2 dxc3 0-1

[Event "IECG CN.2002.0.00279 email"]
[Site "IECG email"]
[Date "2002.01.29"]
[Round "?"]
[White "Kelder, Sjoerd"]
[Black "Scott, David"]
[Result "0-1"]
[ECO "D94"]
[WhiteElo "800"]
[BlackElo "949"]
[PlyCount "18"]
[EventDate "2002.01.29"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e3 g6 2. d4 d5 3. c4 Nf6 4. Nc3 Bg7 5. Nf3 0-0 6. h3 e6 7. Ne5 Nc6 8. f4 Ne4 9. Nxe4 dxe4 0-1

[Event "IECG CN.2002.0.00279 email"]
[Site "IECG email"]
[Date "2002.01.29"]
[Round "?"]
[White "Kelder, Sjoerd"]
[Black "Venturas, Bob"]
[Result "0-1"]
[ECO "A00"]
[WhiteElo "800"]
[BlackElo "504"]
[PlyCount "18"]
[EventDate "2002.01.29"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e3 e5 2. d3 d5 3. d4 e4 4. c4 Nf6 5. Nc3 Bb4 6. cxd5 Nxd5 7. Bd2 Bxc3 8. bxc3 0-0 9. Ne2 Bg4 0-1

