[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.06.21"]
[Round "9"]
[White "Geertsma, Folkert Jan"]
[Black "Passenier, Peter"]
[Result "0-1"]
[ECO "A22"]
[WhiteElo "1939"]
[BlackElo "2136"]
[PlyCount "70"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Bb4 3. d3 Nf6 4. Bd2 0-0 5. Nf3 Re8 6. g3 c6 7. Bg2 d5 8. cxd5 cxd5 9. 0-0 h6 10. a3 Bf8 11. Rc1 Nc6 12. b4 Bg4 13. h3 Bh5 14. g4 Bg6 15. Nh2 e4 16. dxe4 dxe4 17. Bf4 Qe7 18. Nd5 Nxd5 19. Qxd5 Red8 20. Qa2 Qf6 21. e3 a5 22. b5 Ne5 23. Qa1 Nd3 24. Qxf6 gxf6 25. Rc3 Rac8 26. Rxc8 Rxc8 27. Ra1 a4 28. Nf1 Rc3 29. Nd2 Nc5 30. Ra2 f5 31. Be5 Rc1+ 32. Kh2 Nd3 33. Bg3 Nc5 34. Be5 f6 35. Bxf6 Bd6+ 0-1

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.04.26"]
[Round "7"]
[White "Geertsma, Folkert Jan"]
[Black "Feiner, Reinier"]
[Result "1-0"]
[ECO "E64"]
[WhiteElo "1939"]
[BlackElo "2043"]
[PlyCount "113"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. c4 g6 2. d4 Bg7 3. Nc3 Nf6 4. Nf3 d6 5. g3 0-0 6. Bg2 c5 7. dxc5 Qa5 8. 0-0 Qxc5 9. b3 d5 10. Na4 Qa5 11. Bd2 Qa6 12. cxd5 Nxd5 13. Rc1 Nc6 14. Re1 Rd8 15. Qc2 Ncb4 16. Bxb4 Nxb4 17. Qc5 Nxa2 18. Rc2 Be6 19. Qa3 Nc3 20. Ng5 Nb5 21. Qxe7 Rd7 22. Nc5 Rxe7 23. Nxa6 Bxb3 24. Rc5 Ba4 25. e3 h6 26. Nh3 Rd8 27. Nb4 Nc3 28. Nf4 b6 29. Nbd5 Nxd5 30. Rxd5 Rc8 31. Bh3 f5 32. Nxg6 Rf7 33. Bxf5 Rc6 34. Rd8+ Bf8 35. Be4 Re6 36. Rxf8+ Rxf8 37. Nxf8 Kxf8 38. Bd5 Rd6 39. e4 b5 40. Rc1 Ke7 41. f4 b4 42. Rb1 Rb6 43. Kf2 Kd6 44. Ke3 b3 45. Kd4 Rb5 46. e5+ Ke7 47. Bc6 Ra5 48. Bxa4 Rxa4+ 49. Kc3 Ra2 50. Rxb3 Rxh2 51. Rb7+ Ke6 52. Rxa7 Rh3 53. Rg7 Kd5 54. Kd3 h5 55. Ke3 h4 56. Kf3 Ke6 57. Kg2 1-0

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.01.11"]
[Round "4"]
[White "Hubert, Michel1"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D45"]
[WhiteElo "1791"]
[BlackElo "1939"]
[PlyCount "56"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. e3 Be7 6. Bd3 0-0 7. 0-0 dxc4 8. Bxc4 b5 9. Bd3 a6 10. e4 c5 11. dxc5 Bxc5 12. Bg5 Be7 13. e5 Nfd7 14. Bf4 Nc5 15. Bc2 Qxd1 16. Rfxd1 Bb7 17. b4 Ncd7 18. a3 Rc8 19. Be4 Bxe4 20. Nxe4 Nb6 21. Rac1 Rxc1 22. Rxc1 N8d7 23. Rc6 Rc8 24. Nd4 Rxc6 25. Nxc6 Kf8 26. Nd2 Nd5 27. g3 h6 28. Ne4 Ke8 1/2-1/2

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2018.12.07"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Eveleens, Ed"]
[Result "1/2-1/2"]
[ECO "A10"]
[WhiteElo "1939"]
[BlackElo "1675"]
[PlyCount "134"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. c4 f5 2. h3 Nf6 3. g4 d5 4. gxf5 Bxf5 5. Bg2 c6 6. cxd5 cxd5 7. Qb3 Qd7 8. d3 Nc6 9. Nf3 Be6 10. Bf4 d4 11. Qa4 Bd5 12. Nbd2 e5 13. Bg5 Nb4 14. Qxd7+ Nxd7 15. 0-0 Be7 16. Bxe7 Kxe7 17. a3 Bxf3 18. Bxf3 Nc6 19. Rac1 Rac8 20. Rc2 Na5 21. Rfc1 Nb6 22. b4 Rxc2 23. Rxc2 Nc6 24. Bxc6 bxc6 25. Rxc6 Rc8 26. Rxc8 Nxc8 27. Nc4 Ke6 28. Kg2 Ne7 29. Kf3 Nd5 30. e3 dxe3 31. fxe3 Nc7 32. e4 Nb5 33. a4 Nd4+ 34. Kf2 Nc6 35. b5 Nb4 36. Ke2 Nc2 37. b6 Nd4+ 38. Ke3 axb6 39. Nxb6 Nc6 40. Nc4 g5 41. a5 h5 42. a6 g4 43. hxg4 hxg4 44. Kf2 Kf6 45. Kg3 Ke6 46. Kxg4 Kd7 47. Kf5 Kc7 48. Nxe5 Nd4+ 49. Kf4 Kb6 50. Nc4+ Kxa6 51. e5 Kb5 52. Ke4 Ne6 53. Nd6+ Kc6 54. d4 Ng5+ 55. Kd3 Kd5 56. Nf5 Ke6 57. Ne3 Nf3 58. Nc4 Kd5 59. Nb6+ Kc6 60. e6 Kd6 61. d5 Ng5 62. Nc8+ Kc7 63. e7 Kd7 64. d6 Nf7 65. Nb6+ Ke8 66. d7+ Kxe7 67. Kd4 Kd6 1/2-1/2

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2018.11.09"]
[Round "2"]
[White "Vleming, Stefan"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D46"]
[WhiteElo "1654"]
[BlackElo "1939"]
[PlyCount "45"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Be7 6. Bd3 0-0 7. 0-0 Nbd7 8. cxd5 exd5 9. Bd2 Re8 10. Qc2 Bd6 11. Rfe1 Nf8 12. e4 dxe4 13. Nxe4 Nxe4 14. Bxe4 Be6 15. Ng5 h6 16. Bh7+ Kh8 17. Rxe6 hxg5 18. Rxe8 Qxe8 19. Bd3 Ne6 20. Be3 Bf4 21. Bxf4 Nxf4 22. Bc4 Qd7 23. Rd1 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.23"]
[Round "6"]
[White "Aalders, Peter"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "E09"]
[WhiteElo "1907"]
[BlackElo "1968"]
[PlyCount "58"]
[EventDate "2015.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Be7 5. Bg2 0-0 6. 0-0 c6 7. Qc2 b6 8. Bf4 Bb7 9. Rd1 Nbd7 10. Nbd2 Rc8 11. e4 dxe4 12. Nxe4 Nxe4 13. Qxe4 Nf6 14. Qc2 Bd6 15. Bxd6 Qxd6 16. c5 Qc7 17. Rac1 b5 18. Ne5 Rcd8 19. a4 a6 20. axb5 axb5 21. Ra1 Ra8 22. b4 Nd5 23. Bxd5 exd5 24. Qc3 f6 25. Nd3 Rfe8 26. Re1 Kf7 27. Nf4 Rxa1 28. Qxa1 Rxe1+ 29. Qxe1 Bc8 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.16"]
[Round "5"]
[White "Geertsma, Folkert Jan"]
[Black "Van der Scheer, Henk"]
[Result "1/2-1/2"]
[ECO "E61"]
[WhiteElo "1968"]
[BlackElo "1916"]
[PlyCount "43"]
[EventDate "2015.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 g6 2. Nc3 Bg7 3. d4 d6 4. Nf3 c6 5. e3 Nd7 6. Be2 Ngf6 7. 0-0 0-0 8. Qc2 e5 9. dxe5 dxe5 10. Rd1 Qe7 11. b3 Re8 12. Bb2 Nf8 13. a4 e4 14. Nd2 Bf5 15. Nf1 Ng4 16. Ng3 Qh4 17. Bxg4 Bxg4 18. Nce2 Ne6 19. Bxg7 Nxg7 20. Rd4 Bxe2 21. Qxe2 f5 22. Rd7 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.09"]
[Round "4"]
[White "Noordkamp, Wouter"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "A12"]
[WhiteElo "1970"]
[BlackElo "1968"]
[PlyCount "56"]
[EventDate "2015.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. Nf3 Nf6 2. b3 g6 3. Bb2 Bg7 4. e3 0-0 5. Be2 d5 6. c4 c6 7. 0-0 Bf5 8. d4 Re8 9. Ne5 Nfd7 10. f4 Nxe5 11. dxe5 dxc4 12. Bxc4 b5 13. Be2 Qb6 14. Qc1 Nd7 15. Kh1 f6 16. Bf3 fxe5 17. Qxc6 Qxe3 18. Nc3 Rac8 19. Qd5+ Kh8 20. Rae1 Qc5 21. g4 Qxd5 22. Nxd5 Bd3 23. Rf2 e4 24. Bxe4 Bxe4+ 25. Rxe4 Bxb2 26. Rxb2 Nf6 27. Nxf6 exf6 28. Rxe8+ Rxe8 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.02"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Coene, Igor"]
[Result "0-1"]
[ECO "D37"]
[WhiteElo "1968"]
[BlackElo "2203"]
[PlyCount "62"]
[EventDate "2015.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 e6 2. Nc3 d5 3. d4 Be7 4. Nf3 Nf6 5. e3 0-0 6. Be2 b6 7. 0-0 Bb7 8. Bd2 c5 9. Rc1 Nc6 10. cxd5 exd5 11. Qc2 Ne4 12. Rfd1 Nxd2 13. Rxd2 c4 14. Qf5 Bb4 15. Rdd1 Ne7 16. Qc2 Rc8 17. Nd2 f5 18. b3 f4 19. bxc4 fxe3 20. fxe3 Nf5 21. Qb3 Nxe3 22. Qxb4 Qg5 23. g3 Qf6 24. Bf3 Qxd4 25. Ne2 Qf6 26. Rf1 Nxf1 27. Rxf1 Qe5 28. Qc3 Qe7 29. Qd4 Rxf3 30. Rxf3 Qxe2 31. Re3 Qd1+ 0-1

[Event "NED-chT 1314"]
[Site "Netherlands"]
[Date "2014.04.12"]
[Round "8.10"]
[White "Bierenbroodspot, Paul"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "2144"]
[PlyCount "57"]
[EventDate "2013.09.21"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]
[WhiteTeam "ESG Max Euwe"]
[BlackTeam "Leiden LSG"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 d5 2. exd5 Qxd5 3. Nf3 Nf6 4. d4 c6 5. c4 Qa5+ 6. Bd2 Qc7 7. Bd3 e6 8. 0-0 Be7 9. Nc3 0-0 10. Qc2 Nbd7 11. Rfe1 Re8 12. a3 b6 13. b4 a5 14. Qb3 axb4 15. axb4 Bb7 16. c5 Reb8 17. Qc2 Rxa1 18. Rxa1 Ra8 19. Rxa8+ Bxa8 20. Qa2 Qb8 21. Bf4 Qxf4 22. Qxa8+ Bf8 23. Ne2 Qc7 24. Bc4 e5 25. Ng5 Nd5 26. Bxd5 cxd5 27. Qxd5 bxc5 28. Qxf7+ Kh8 29. dxc5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.07.02"]
[Round "7"]
[White "Geertsma, Folkert Jan"]
[Black "Bloothoofd, Gerrie"]
[Result "1/2-1/2"]
[ECO "A27"]
[PlyCount "35"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nc6 3. Nf3 f5 4. d3 Nf6 5. g3 Bc5 6. e3 0-0 7. Bg2 f4 8. 0-0 fxe3 9. Bxe3 Bxe3 10. fxe3 d6 11. Nd2 Ng4 12. Rxf8+ Qxf8 13. Qe2 Ne7 14. Rf1 Qe8 15. Nd5 Nxd5 16. Bxd5+ Kh8 17. Qf3 Be6 18. Bxe6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.25"]
[Round "6"]
[White "Van Drunick, Jan Willem"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D53"]
[PlyCount "22"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Be7 6. e3 0-0 7. Rc1 dxc4 8. Bxc4 Nd5 9. Bxe7 Qxe7 10. 0-0 Nd7 11. a3 N7f6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.18"]
[Round "5"]
[White "Geertsma, Folkert Jan"]
[Black "Fakkert, Erwin"]
[Result "1-0"]
[ECO "A34"]
[PlyCount "79"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 c5 2. Nc3 Nf6 3. g3 e6 4. Bg2 Nc6 5. d3 Be7 6. Nf3 0-0 7. 0-0 d5 8. e3 dxc4 9. dxc4 Qc7 10. Qe2 a6 11. b3 Bd7 12. Bb2 Rad8 13. Rfd1 Bc8 14. Nd2 Ne5 15. Nde4 Ned7 16. Rd2 Nxe4 17. Nxe4 f5 18. Nc3 Bf6 19. Rad1 Nb8 20. Na4 Bxb2 21. Nxb2 Rd7 22. Rxd7 Nxd7 23. Qd2 Nf6 24. Na4 b5 25. cxb5 axb5 26. Nc3 Bd7 27. Ne2 Qa7 28. Nc1 Rc8 29. Nd3 Bc6 30. Bxc6 Rd8 31. Bxb5 Ne4 32. Qc2 h6 33. Bc4 Re8 34. a4 Qa5 35. h4 Kh7 36. Kg2 Qa8 37. f3 Nf6 38. Nxc5 Ng4 39. Qe2 e5 40. Bd5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.11"]
[Round "4"]
[White "Faydi, Jonathan J"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "B01"]
[WhiteElo "2138"]
[PlyCount "48"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 c6 5. Bc4 Nf6 6. Bd2 Qc7 7. Nf3 e6 8. Qe2 Be7 9. 0-0-0 0-0 10. Ne5 a5 11. g4 b5 12. Bd3 b4 13. Ne4 Ba6 14. Nc4 Nbd7 15. g5 Nd5 16. Qg4 c5 17. dxc5 Bxc5 18. Qh4 g6 19. Nxc5 Qxc5 20. Qe4 Rfc8 21. b3 a4 22. h4 axb3 23. axb3 Bxc4 24. Bxc4 N7b6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.04"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Noordijk, Ed"]
[Result "1/2-1/2"]
[ECO "A54"]
[BlackElo "1852"]
[PlyCount "45"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 Nf6 2. d4 d6 3. Nc3 Nbd7 4. Nf3 e5 5. e3 c6 6. Bd3 Qc7 7. 0-0 Be7 8. b3 0-0 9. Qc2 Re8 10. Bb2 Nf8 11. h3 Bd8 12. Rfd1 Ng6 13. Rd2 exd4 14. Nxd4 Ne5 15. Bf5 g6 16. Bxc8 Rxc8 17. Qd1 Be7 18. Rc1 Rcd8 19. Nf3 Qa5 20. Rcc2 Ned7 21. a3 Qh5 22. Rd4 Ne5 23. Nxe5 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.05.28"]
[Round "2"]
[White "Van Wessel, Rudy"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "D46"]
[WhiteElo "2387"]
[PlyCount "57"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. e3 Be7 6. Bd3 0-0 7. 0-0 Nbd7 8. Qe2 Qc7 9. e4 dxe4 10. Nxe4 c5 11. Bg5 cxd4 12. Rad1 Re8 13. Nxd4 Nxe4 14. Bxe7 Rxe7 15. Nb5 Qe5 16. Qxe4 Qxe4 17. Bxe4 f5 18. Bf3 a6 19. Nd6 Ne5 20. Be2 Rb8 21. Rfe1 Nf7 22. c5 Rc7 23. b4 Bd7 24. Bc4 Nxd6 25. Rxd6 a5 26. Rxd7 Rxd7 27. Bxe6+ Rf7 28. bxa5 Ra8 29. Rb1 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.05.21"]
[Round "1"]
[White "Geertsma, Folkert Jan"]
[Black "Uittenbogaard, Rob"]
[Result "1-0"]
[ECO "A31"]
[BlackElo "1616"]
[PlyCount "105"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 c5 2. Nc3 Nc6 3. Nf3 Nf6 4. d4 cxd4 5. Nxd4 a6 6. g3 e6 7. a3 Qb6 8. e3 Be7 9. Bg2 0-0 10. 0-0 d6 11. Nxc6 bxc6 12. b4 Bb7 13. Rb1 Qc7 14. Qc2 Rab8 15. Bb2 Rfc8 16. Qe2 Ba8 17. Rfc1 c5 18. b5 a5 19. Bxa8 Rxa8 20. a4 Rab8 21. Rd1 Rd8 22. e4 Nd7 23. Ba1 Rb6 24. f4 Bf6 25. Kg2 Qb7 26. Qf3 Qc7 27. g4 Bxc3 28. Qxc3 f6 29. Qxa5 e5 30. f5 Qb7 31. Qe1 Ra8 32. Rd5 Qa7 33. Bc3 Qxa4 34. Ra1 Qc2+ 35. Kf3 Rxa1 36. Qxa1 Qxh2 37. Bd2 Qh3+ 38. Kf2 Qxg4 39. Qa7 Qh4+ 40. Kf3 Qh5+ 41. Kf2 Qe8 42. Ba5 Rb8 43. Rxd6 Ra8 44. Qxd7 Qxd7 45. Rxd7 Rxa5 46. Rd5 Ra2+ 47. Kf3 Rc2 48. Rxc5 Kf7 49. Rc7+ Ke8 50. Rxg7 Rxc4 51. b6 Rb4 52. b7 Kf8 53. Rxh7 1-0

[Event "Ghent Taminco op 35th"]
[Site "Ghent"]
[Date "2012.07.14"]
[Round "2"]
[White "Karasik, Evgeni"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "2279"]
[BlackElo "1978"]
[PlyCount "147"]
[EventDate "2012.07.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "BEL"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 c6 5. Nf3 Nf6 6. Ne5 e6 7. Nc4 Qc7 8. Qf3 Be7 9. Bd3 0-0 10. 0-0 Nbd7 11. Bf4 Qd8 12. Rad1 Nd5 13. Nxd5 exd5 14. Nd6 Bxd6 15. Bxd6 Re8 16. Rde1 Nf6 17. Be5 Be6 18. h3 Nd7 19. Qh5 g6 20. Qh6 Nxe5 21. dxe5 Qd7 22. Qg5 Qe7 23. Qxe7 Rxe7 24. f4 Rae8 25. Kf2 d4 26. a3 c5 27. Be4 Rd8 28. Rd1 Rde8 29. Rd2 Bc4 30. Bd3 Bxd3 31. cxd3 Re6 32. Rc1 b6 33. b4 cxb4 34. axb4 f6 35. Rc4 fxe5 36. fxe5 Rxe5 37. Rxd4 a5 38. bxa5 bxa5 39. Rc2 Rf5+ 40. Kg3 Re3+ 41. Kh2 Ree5 42. Rd7 Rf7 43. Rd4 Rff5 44. Rdc4 Rd5 45. d4 Rf4 46. Rd2 Kg7 47. g3 Re4 48. Kg2 Kf6 49. Kf3 Re6 50. g4 h5 51. Ra2 hxg4+ 52. hxg4 Red6 53. Ke4 Rg5 54. Kf3 Rb5 55. Ra3 Rb4 56. Rc5 Rbxd4 57. g5+ Ke6 58. Re3+ Kf7 59. Rxa5 Rd3 60. Rxd3 Rxd3+ 61. Ke4 Rd7 62. Ra6 Kg7 63. Ke5 Rb7 64. Ke6 Rc7 65. Rd6 Ra7 66. Rd5 Rb7 67. Rd6 Ra7 68. Rd7+ Rxd7 69. Kxd7 Kf7 70. Kd6 Kf8 71. Ke6 Ke8 72. Kf6 Kf8 73. Kxg6 Kg8 74. Kf6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.06.27"]
[Round "7"]
[White "Hellenberg, Jan Amerik"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "A10"]
[WhiteElo "1595"]
[BlackElo "1978"]
[PlyCount "102"]
[EventDate "2012.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 b6 2. Nc3 Bb7 3. e4 e6 4. g3 c5 5. Bg2 Nc6 6. Nge2 Be7 7. 0-0 d6 8. d4 Bf6 9. Be3 Nge7 10. f4 e5 11. fxe5 dxe5 12. dxc5 bxc5 13. Bxc5 Qa5 14. b4 Nxb4 15. Bxb4 Qxb4 16. Rb1 Qc5+ 17. Kh1 Ba6 18. Nd5 Nxd5 19. Qa4+ Kf8 20. exd5 Qxc4 21. Qa3+ Kg8 22. Nc3 Qc8 23. d6 Bxf1 24. Rxf1 Rb8 25. Nd5 Qd8 26. Ne7+ Bxe7 27. dxe7 Qd7 28. Bf3 g6 29. Qc5 Re8 30. Qxe5 Qxe7 31. Qd4 h6 32. Bd5 Rh7 33. Qd3 Rg7 34. Qc4 Rf8 35. Rb1 Qe3 36. Rb7 Qf2 37. Rb1 Re8 38. Rf1 Re1 39. Rxe1 Qxe1+ 40. Kg2 Qd2+ 41. Kf3 a5 42. Qe4 Qc3+ 43. Kg2 Kh7 44. Bb3 Qb4 45. Qa8 f5 46. Kf2 f4 47. gxf4 Qxf4+ 48. Kg2 Qb4 49. Kf2 h5 50. h3 Qe7 51. Kg3 Qc7+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.06.19"]
[Round "6"]
[White "Geertsma, Folkert Jan"]
[Black "Straver, Robert"]
[Result "1/2-1/2"]
[ECO "D10"]
[WhiteElo "1978"]
[BlackElo "2107"]
[PlyCount "47"]
[EventDate "2012.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 c6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxc4 5. g3 h6 6. Bxf6 exf6 7. a4 Bb4 8. Bg2 Qa5 9. Qc1 0-0 10. Nf3 Re8 11. Nd2 Qb6 12. d5 Bg4 13. 0-0 Bxc3 14. Qxc3 cxd5 15. Bxd5 Bxe2 16. Rfe1 Nc6 17. Nxc4 Bxc4 18. Qxc4 Ne5 19. Qb5 Nc6 20. Rxe8+ Rxe8 21. Qxb6 axb6 22. Rc1 Kf8 23. Rc3 Re2 24. Rb3 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.06.05"]
[Round "4"]
[White "Korving, Frank"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "A07"]
[BlackElo "1978"]
[PlyCount "34"]
[EventDate "2012.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. g3 d5 2. Bg2 Nf6 3. d3 c6 4. Nd2 Bg4 5. Ngf3 Nbd7 6. c4 e6 7. Qb3 Qc7 8. 0-0 Be7 9. Re1 0-0 10. h3 Bh5 11. e4 dxc4 12. dxc4 Nc5 13. Qc2 Rfd8 14. Re3 Na6 15. a3 Bc5 16. Re1 Qxg3 17. Nb3 Bxf3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.05.29"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Van den Bosse, Bart"]
[Result "1/2-1/2"]
[ECO "D15"]
[WhiteElo "1978"]
[PlyCount "38"]
[EventDate "2012.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 c6 2. d4 d5 3. Nc3 Nf6 4. Nf3 a6 5. e3 b5 6. cxd5 cxd5 7. Bd3 Bb7 8. Bd2 e6 9. 0-0 Bd6 10. Rc1 Nbd7 11. Ne2 0-0 12. Ng3 Qe7 13. Qc2 Rac8 14. Qb1 h6 15. Rxc8 Rxc8 16. Rc1 Rxc1+ 17. Qxc1 Nb6 18. b3 Qc7 19. Qxc7 Bxc7 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.05.22"]
[Round "2"]
[White "Noordijk, Ed"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "B02"]
[WhiteElo "1763"]
[BlackElo "1978"]
[PlyCount "54"]
[EventDate "2012.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. Nf3 d5 2. d3 Nf6 3. Nbd2 Bg4 4. e4 Nc6 5. Be2 dxe4 6. dxe4 a6 7. c3 e6 8. Qc2 Bc5 9. Nc4 h6 10. Nce5 Nxe5 11. Nxe5 Bxe2 12. Qxe2 Qe7 13. 0-0 0-0 14. Kh1 Rfd8 15. Bf4 Bd6 16. Rad1 Nd7 17. Nd3 Bxf4 18. Nxf4 Nc5 19. g3 Qe8 20. f3 Rxd1 21. Rxd1 Rd8 22. b3 Rd7 23. Kg2 Qd8 24. Rxd7 Qxd7 25. Qc2 a5 26. b4 axb4 27. cxb4 Na6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.28"]
[Round "7"]
[White "Straver, Robert"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "D45"]
[WhiteElo "2143"]
[BlackElo "1976"]
[PlyCount "71"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Be7 6. Qc2 Nbd7 7. Bd3 dxc4 8. Bxc4 Nb6 9. Bd3 Nbd5 10. a3 Nxc3 11. bxc3 c5 12. 0-0 Bd7 13. Rb1 Qc7 14. Qe2 a6 15. Ne5 0-0 16. f4 Rfd8 17. g4 Nd5 18. g5 Be8 19. Bxh7+ Kxh7 20. c4 Nf6 21. gxf6 Bxf6 22. Rf3 g6 23. Bb2 b5 24. Rh3+ Kg7 25. d5 exd5 26. Ng4 Bxb2 27. Qxb2+ d4 28. f5 gxf5 29. Nh6 Qe5 30. Rf1 Bd7 31. Qg2+ Kf8 32. Qg8+ Ke7 33. Qxf7+ Kd6 34. Rxf5 Rg8+ 35. Nxg8 Bxf5 36. Rh6+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.21"]
[Round "6"]
[White "Geertsma, Folkert Jan"]
[Black "Thissen, Thomas"]
[Result "1/2-1/2"]
[ECO "A86"]
[WhiteElo "1976"]
[BlackElo "1986"]
[PlyCount "25"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 f5 2. d4 Nf6 3. Nc3 g6 4. g3 Bg7 5. Bg2 0-0 6. e3 d6 7. Nge2 c6 8. 0-0 Qe8 9. b3 e5 10. Ba3 exd4 11. exd4 Qd8 12. Qd2 Nh5 13. f4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.15"]
[Round "5"]
[White "Van Ketel, Raoul"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D45"]
[WhiteElo "2290"]
[BlackElo "1976"]
[PlyCount "85"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 Be7 7. g4 dxc4 8. Bxc4 Nb6 9. Bb3 Nbd5 10. g5 Nd7 11. e4 Nxc3 12. Qxc3 a5 13. Bd2 Bb4 14. Qe3 Bxd2+ 15. Nxd2 e5 16. Nc4 Qe7 17. 0-0-0 b5 18. Nxe5 Nxe5 19. dxe5 Qxe5 20. f4 Qe7 21. Rd3 a4 22. Bc2 Be6 23. Kb1 c5 24. e5 Bf5 25. Rd6 Bxc2+ 26. Kxc2 0-0 27. Rhd1 c4 28. Kb1 b4 29. Qc5 c3 30. bxc3 bxc3 31. Qxc3 Rfc8 32. Qd4 Qc7 33. Ka1 Rab8 34. Qd2 a3 35. f5 h6 36. g6 fxg6 37. fxg6 Qe7 38. Qd5+ Kh8 39. Qd4 Qg5 40. Qd2 Qxe5+ 41. Qd4 Qg5 42. Qd2 Qe5+ 43. Qd4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.07"]
[Round "4"]
[White "Geertsma, Folkert Jan"]
[Black "De Leur, Ben"]
[Result "1/2-1/2"]
[ECO "A24"]
[WhiteElo "1976"]
[BlackElo "2060"]
[PlyCount "33"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 0-0 5. Nf3 d6 6. 0-0 Nbd7 7. d3 e5 8. Bd2 h6 9. Nh4 Kh7 10. e3 Nc5 11. d4 exd4 12. exd4 Ne6 13. Be3 Ng8 14. Qd2 f5 15. f4 Nf6 16. h3 a6 17. b4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.01"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "D35"]
[WhiteElo "1976"]
[BlackElo "1742"]
[PlyCount "19"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e6 2. Nc3 Nf6 3. Nf3 d5 4. cxd5 exd5 5. d4 c6 6. Bf4 Be7 7. e3 0-0 8. Qc2 Re8 9. Bd3 Ne4 10. Nxe4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.05.24"]
[Round "2"]
[White "Volders, Wessel"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "1819"]
[BlackElo "1976"]
[PlyCount "68"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6 4. Bc4 Nf6 5. d3 a6 6. Qf3 e6 7. Bf4 Qb6 8. Bb3 Bd6 9. Nge2 Bd7 10. Be3 Bc6 11. Qxf6 gxf6 12. Bxb6 cxb6 13. Ne4 Be7 14. f3 f5 15. Nd2 Bh4+ 16. g3 Bf6 17. c3 Nd7 18. d4 b5 19. Kf2 0-0-0 20. Rhd1 Nb6 21. a3 h5 22. h4 Rh7 23. Bc2 Nd5 24. f4 Rg7 25. Nf3 Rdg8 26. Rg1 Bd8 27. Ne5 Be8 28. a4 bxa4 29. Bxa4 Bxa4 30. Rxa4 Nf6 31. Kf3 Ne4 32. Rga1 Bc7 33. Rd1 Rd8 34. Nc4 Rd5 1/2-1/2

[Event "Ghent Taminco op 33rd"]
[Site "Ghent"]
[Date "2010.07.18"]
[Round "4"]
[White "Geertsma, Folkert Jan"]
[Black "Groenewolt, Jessica"]
[Result "1-0"]
[ECO "A00"]
[BlackElo "1701"]
[PlyCount "75"]
[EventDate "2010.07.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "BEL"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. b4 d5 2. Bb2 Nf6 3. e3 Bf5 4. c4 c6 5. Nf3 e6 6. a3 Bd6 7. Nc3 e5 8. cxd5 cxd5 9. Nb5 e4 10. Nxd6+ Qxd6 11. Nd4 Bd7 12. Rc1 a6 13. b5 0-0 14. Qb3 Ng4 15. h3 Ne5 16. Be2 f5 17. Bc3 a5 18. Qb2 Be8 19. Nb3 Nbd7 20. Nxa5 Bh5 21. Bf1 Nd3+ 22. Bxd3 exd3 23. Bb4 Qg6 24. Rg1 Rfe8 25. Nb3 f4 26. g4 Ne5 27. Kf1 Nxg4 28. hxg4 Bxg4 29. Ke1 Qh5 30. Qd4 Qh2 31. Qxd5+ Be6 32. Rxg7+ Kh8 33. Qg2 Qh5 34. f3 Qh4+ 35. Kf1 fxe3 36. Rg8+ Rxg8 37. Bc3+ Rg7 38. Qxg7# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.29"]
[Round "7"]
[White "Gusnuckow, Milo"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "B01"]
[BlackElo "1964"]
[PlyCount "102"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 c6 5. Bd2 Qd8 6. Nf3 Bg4 7. Bc4 e6 8. Qe2 Nf6 9. 0-0-0 Be7 10. h3 Bxf3 11. gxf3 Nbd7 12. Rhg1 g6 13. Kb1 Nb6 14. Bc1 Nxc4 15. Qxc4 Qd7 16. Bg5 Nd5 17. Bxe7 Nxc3+ 18. Qxc3 Kxe7 19. Qc5+ Qd6 20. Qg5+ f6 21. Qh6 Kf7 22. f4 Qd5 23. Qh4 Rad8 24. b3 Rd7 25. Rge1 Qf5 26. Qg3 Rhd8 27. Qe3 c5 28. d5 Rxd5 29. Qf3 Ke7 30. Kb2 Rxd1 31. Rxd1 Rxd1 32. Qxd1 Qxf4 33. Qh1 Qd4+ 34. Kb1 Qd5 35. Qf1 a6 36. a4 e5 37. f3 Qc6 38. Qc4 h5 39. Qg8 Qxf3 40. Qxg6 b5 41. axb5 axb5 42. Qg7+ Ke6 43. Qg8+ Kf5 44. Qc8+ Kf4 45. Qxc5 Qd1+ 46. Ka2 e4 47. Qc7+ Kf3 48. Qc3+ Kg2 49. Qxf6 Qxc2+ 50. Ka3 Qc5+ 51. b4 Qe3+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.22"]
[Round "6"]
[White "Geertsma, Folkert Jan"]
[Black "Oei, Hway Ik"]
[Result "0-1"]
[ECO "A15"]
[WhiteElo "1964"]
[BlackElo "2126"]
[PlyCount "120"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. b4 e5 2. Bb2 d6 3. c4 Nf6 4. Nf3 g6 5. g3 Bg7 6. Bg2 0-0 7. 0-0 Re8 8. d3 Nbd7 9. Nc3 c6 10. b5 d5 11. bxc6 bxc6 12. cxd5 cxd5 13. Nd2 Nb6 14. Rc1 a6 15. Nb3 Bf8 16. Rc2 Rb8 17. Qc1 d4 18. Ne4 Nxe4 19. Bxe4 Nd5 20. Qa1 Nb4 21. Rcc1 a5 22. Rfd1 Bg4 23. Kf1 Bh6 24. Nd2 Be6 25. a3 Nd5 26. Rc2 Nb6 27. Bc6 Bd7 28. Bxd7 Qxd7 29. Ne4 Qd8 30. Bc1 Bf8 31. Bd2 a4 32. Rb1 Nd7 33. Bb4 Re6 34. Bxf8 Qxf8 35. Rxb8 Qxb8 36. Qc1 Kg7 37. Kg2 Qb6 38. Nc5 Nxc5 39. Rxc5 Qb7+ 40. Kg1 Rb6 41. Rc7 Rb1 42. Rxb7 Rxc1+ 43. Kg2 Rc3 44. Kf3 Rxa3 45. Ke4 Ra2 46. e3 Rxf2 47. exd4 exd4 48. Ra7 Rxh2 49. Rxa4 Re2+ 50. Kf4 Rf2+ 51. Ke4 f5+ 52. Kxd4 Rf3 53. Ra7+ Kf6 54. Rxh7 Rxg3 55. Rh8 f4 56. Ke4 Kg5 57. Rf8 Re3+ 58. Kd4 Kg4 59. Kc4 f3 60. d4 Re4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.15"]
[Round "5"]
[White "Vernooy, Daan"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "E32"]
[WhiteElo "1609"]
[BlackElo "1964"]
[PlyCount "82"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 b6 2. c4 Bb7 3. Nc3 e6 4. e4 Bb4 5. Qc2 Nf6 6. f3 h6 7. Be3 0-0 8. Bd3 d6 9. Nge2 Nbd7 10. a3 Bxc3+ 11. Qxc3 c5 12. d5 exd5 13. cxd5 Ne5 14. 0-0 Nxd3 15. Qxd3 a5 16. Rfc1 Qe7 17. Ng3 Bc8 18. Ne2 Re8 19. Nc3 Ba6 20. Qd2 Kh7 21. a4 Nd7 22. b3 Ne5 23. Nd1 Qf6 24. Nf2 Qg6 25. Kh1 Re7 26. Rc3 Rf8 27. Nh3 f5 28. Nf4 Qe8 29. Ne6 Rff7 30. h3 fxe4 31. fxe4 Bc8 32. Nf4 g5 33. Ne2 Qf8 34. Ng3 Bd7 35. Qe2 Bc8 36. Qh5 Qg7 37. Rac1 Qg6 38. Qxg6+ Kxg6 39. Rf1 Rxf1+ 40. Nxf1 Nd7 41. Nd2 Nf6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.08"]
[Round "4"]
[White "Geertsma, Folkert Jan"]
[Black "Erwich, Frans"]
[Result "0-1"]
[ECO "A30"]
[WhiteElo "1964"]
[BlackElo "1981"]
[PlyCount "80"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. d3 b6 6. Nf3 Bb7 7. 0-0 Nf6 8. Bd2 0-0 9. a3 d6 10. Rb1 Nd4 11. Nxd4 Bxg2 12. Kxg2 cxd4 13. Na2 d5 14. Nb4 dxc4 15. dxc4 Qd7 16. Rc1 Rac8 17. b3 Rfd8 18. Nd3 Ne4 19. f3 Nc3 20. Bxc3 dxc3 21. Qc2 b5 22. c5 a5 23. Rcd1 Bd4 24. b4 a4 25. Nc1 Qe6 26. Rd3 Rd7 27. Rfd1 Rcd8 28. e3 Be5 29. f4 Bf6 30. Rxd7 Rxd7 31. Rxd7 Qxd7 32. Qd3 Qc6+ 33. e4 e6 34. Kf3 Bg7 35. Qd6 Qxd6 36. cxd6 Kf8 37. e5 f6 38. Ke4 fxe5 39. fxe5 Bh6 40. Nd3 c2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.01"]
[Round "3"]
[White "Weiland, Harro"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "1934"]
[BlackElo "1964"]
[PlyCount "51"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nf3 Bg4 4. Be2 e6 5. d4 Bb4+ 6. c3 Be7 7. c4 Qd8 8. Nc3 Nf6 9. 0-0 0-0 10. h3 Bh5 11. a3 Nbd7 12. Ne5 Bxe2 13. Qxe2 c6 14. Bf4 Re8 15. b4 a6 16. Rfd1 Nf8 17. Qf3 Ng6 18. Nxg6 hxg6 19. d5 exd5 20. cxd5 cxd5 21. Nxd5 Nxd5 22. Rxd5 Qb6 23. Rc1 Qf6 24. Qg3 Rac8 25. Re1 Qc6 26. Qd3 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.30"]
[Round "7"]
[White "Geertsma, Folkert Jan"]
[Black "Scherpenisse, Kees"]
[Result "1/2-1/2"]
[ECO "A21"]
[WhiteElo "1931"]
[BlackElo "1832"]
[PlyCount "45"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 f5 3. d3 Nf6 4. g3 d6 5. Bg2 c6 6. Nf3 g6 7. 0-0 Bg7 8. Bd2 a5 9. a3 0-0 10. b4 axb4 11. axb4 Rxa1 12. Qxa1 e4 13. Ne1 d5 14. Qa7 Nbd7 15. cxd5 cxd5 16. Nc2 Ne5 17. dxe4 dxe4 18. Bf4 Qe7 19. Rd1 Nf7 20. Be3 Re8 21. Bc5 Qe6 22. Qa3 Nd7 23. Bd4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.23"]
[Round "6"]
[White "Oosterom, Erik"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D61"]
[WhiteElo "2091"]
[BlackElo "1931"]
[PlyCount "117"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. Bg5 Be7 6. e3 0-0 7. Qc2 Nbd7 8. Bd3 h6 9. Bh4 dxc4 10. Bxc4 b5 11. Be2 a6 12. Rd1 Bb7 13. 0-0 Rc8 14. Qb1 c5 15. dxc5 Rxc5 16. Rd2 Qc8 17. Rfd1 Rd8 18. a3 Nf8 19. Nd4 Qa8 20. f3 Ng6 21. Bg3 Ne5 22. Nb3 Rxd2 23. Rxd2 Nc4 24. Bxc4 Rxc4 25. Na5 Rc8 26. e4 Bc5+ 27. Bf2 Bxf2+ 28. Rxf2 Rd8 29. Qe1 Qa7 30. Kf1 Ba8 31. Rd2 Qc7 32. Rxd8+ Qxd8 33. Ne2 Ne8 34. Qc3 Qc7 35. Qxc7 Nxc7 36. Kf2 Kf8 37. Ke3 Ke7 38. Kd4 f6 39. Kc5 Kd7 40. Nf4 g5 41. Nh5 f5 42. Nf6+ Kc8 43. Kd6 Kd8 44. exf5 exf5 45. Ng8 h5 46. Nh6 g4 47. fxg4 fxg4 48. g3 Nd5 49. Nf5 Nf6 50. Nb3 Ne4+ 51. Ke5 Nf2 52. Nc5 a5 53. Ng7 Nd1 54. b4 axb4 55. axb4 Ne3 56. Nxh5 Nf1 57. Ne6+ Kc8 58. Nd4 Nxh2 59. Nxb5 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.16"]
[Round "5"]
[White "Geertsma, Folkert Jan"]
[Black "Heijboer, Herman"]
[Result "1-0"]
[ECO "A10"]
[WhiteElo "1931"]
[PlyCount "75"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 f5 2. h3 Nf6 3. g4 d5 4. g5 Ne4 5. d3 Nc5 6. cxd5 Qxd5 7. Nf3 e5 8. Nc3 Qe6 9. Bg2 Bd6 10. Nd2 c6 11. Nc4 Nba6 12. a3 Nc7 13. b4 Nd7 14. Rb1 Nb6 15. Nxd6+ Qxd6 16. Bb2 Be6 17. Na4 Nxa4 18. Qxa4 0-0 19. Qc2 Nd5 20. Qc5 Qd8 21. h4 Qc7 22. Rc1 Rac8 23. Qxa7 Nf4 24. Bf3 Bd5 25. Bxd5+ Nxd5 26. Qc5 e4 27. dxe4 fxe4 28. e3 Qf7 29. Rf1 Qh5 30. Qd4 Rf7 31. b5 Qxh4 32. bxc6 bxc6 33. Rc4 Qxg5 34. Qxe4 Rcf8 35. Bd4 Nf6 36. Qe5 Qxe5 37. Bxe5 Ng4 38. Rxg4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.09"]
[Round "4"]
[White "Van Briemen, Willem Jan"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D61"]
[WhiteElo "1894"]
[BlackElo "1931"]
[PlyCount "47"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 c6 2. c4 d5 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Be7 6. e3 0-0 7. Qc2 Nbd7 8. 0-0-0 dxc4 9. Bxc4 Nd5 10. h4 N7b6 11. Nxd5 cxd5 12. Bd3 h6 13. Bxe7 Qxe7 14. g4 Bd7 15. Qe2 Rfc8+ 16. Kb1 Qb4 17. a3 Qb3 18. Nd2 Qa4 19. g5 hxg5 20. hxg5 Kf8 21. Rh7 a6 22. Qh5 Bb5 23. Bxb5 axb5 24. Rh8+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.02"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "De Wit, Jerome"]
[Result "1/2-1/2"]
[ECO "A26"]
[WhiteElo "1931"]
[PlyCount "116"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nc6 3. Nf3 g6 4. d3 Bg7 5. g3 d6 6. Bg2 Nge7 7. 0-0 0-0 8. Bd2 h6 9. Qc1 Kh7 10. Rb1 Rb8 11. b4 a6 12. a4 a5 13. b5 Nb4 14. Ne1 Be6 15. Nc2 c5 16. bxc6 bxc6 17. h3 Qd7 18. Kh2 f5 19. Nd1 c5 20. Nc3 f4 21. Na3 f3 22. exf3 Nxd3 23. Qc2 Nb4 24. Qd1 Nf5 25. Ncb5 Nd4 26. f4 d5 27. cxd5 Bxd5 28. Nxd4 exd4 29. Nb5 Bxg2 30. Kxg2 Rbc8 31. Qc1 Rfe8 32. Qc4 Qe6 33. Qxe6 Rxe6 34. Rfc1 Re2 35. Bxb4 axb4 36. Rxb4 cxb4 37. Rxc8 b3 38. Rc1 b2 39. Rb1 d3 40. Kf3 Rc2 41. Ke3 Rc1 42. Na3 Bf8 43. Rxb2 Bxa3 44. Rb7+ Kg8 45. Kxd3 Rc6 46. a5 Bc5 47. f3 Bf2 48. g4 Bg3 49. Rb6 Rxb6 50. axb6 Bxf4 51. Ke4 Bd6 52. f4 Kf7 53. f5 gxf5+ 54. Kxf5 Kg7 55. h4 Bg3 56. b7 Bb8 57. g5 hxg5 58. hxg5 Bh2 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.05.26"]
[Round "2"]
[White "Heemskerk, Wim"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "A39"]
[WhiteElo "2182"]
[BlackElo "1931"]
[PlyCount "87"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. Nf3 d6 2. g3 c5 3. c4 g6 4. Nc3 Bg7 5. Bg2 Nc6 6. 0-0 Nf6 7. d4 cxd4 8. Nxd4 Nxd4 9. Qxd4 0-0 10. Qd3 Rb8 11. Bd2 b6 12. Rac1 Nd7 13. e4 Bb7 14. Rfd1 Rc8 15. Qe2 Qe8 16. b3 Nc5 17. h4 h5 18. Kh2 Bc6 19. Bg5 Ne6 20. Be3 Kh7 21. b4 Bxc3 22. Rxc3 a5 23. a3 axb4 24. axb4 b5 25. f4 bxc4 26. f5 Ng7 27. Bh3 Rb8 28. Qxc4 Bb5 29. Qd4 gxf5 30. exf5 f6 31. Qf4 Rc8 32. Rdc1 Rxc3 33. Rxc3 Qf7 34. Rc7 Qa2+ 35. Bd2 Re8 36. Bg2 Bd3 37. Bc6 Rf8 38. Rxe7 Rf7 39. Rxf7 Qxf7 40. b5 Bxf5 41. b6 Bc8 42. Qxd6 Nf5 43. Qf4 Qb3 44. b7 1-0

[Event "Ghent Taminco op 31st"]
[Site "Ghent"]
[Date "2008.07.22"]
[Round "7"]
[White "Geertsma, Folkert Jan"]
[Black "Timmermans, Ivo"]
[Result "0-1"]
[ECO "A29"]
[BlackElo "2220"]
[PlyCount "54"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "BEL"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 Bb4 5. Bg2 0-0 6. 0-0 e4 7. Ng5 Bxc3 8. bxc3 Re8 9. d3 exd3 10. exd3 h6 11. Ne4 b6 12. Be3 Bb7 13. Qd2 Rb8 14. f4 Ng4 15. Rfe1 Na5 16. Nf2 Bxg2 17. Kxg2 Nxf2 18. Bxf2 d6 19. Rxe8+ Qxe8 20. Re1 Qc6+ 21. Kg1 Re8 22. Re2 f5 23. Bd4 g6 24. h3 Kf7 25. g4 fxg4 26. hxg4 Qf3 27. Rxe8 Qxg4+ 0-1

[Event "Ghent Taminco op 31st"]
[Site "Ghent"]
[Date "2008.07.21"]
[Round "5"]
[White "Geertsma, Folkert Jan"]
[Black "Versporten, Wim"]
[Result "1/2-1/2"]
[ECO "D52"]
[BlackElo "2151"]
[PlyCount "62"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "BEL"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. c4 c6 2. d4 d5 3. Nc3 Nf6 4. Nf3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. Bxf6 Nxf6 8. Nd2 Bd6 9. Bd3 0-0 10. Qc2 e5 11. dxe5 Bxe5 12. 0-0 dxc4 13. Nxc4 Qc7 14. Nxe5 Qxe5 15. Ne4 Ng4 16. Ng3 h5 17. Bh7+ Kh8 18. Bf5 h4 19. Bxc8 Raxc8 20. Qf5 hxg3 21. Qxg4 gxf2+ 22. Rxf2 Qxe3 23. Raf1 c5 24. Kh1 f6 25. Rf3 Qe5 26. Rh3+ Kg8 27. Qc4+ Rf7 28. Qh4 Rfc7 29. Qc4+ Kf8 30. Rh8+ Ke7 31. Rh4 b5 1/2-1/2

[Event "Ghent Taminco op 31st"]
[Site "Ghent"]
[Date "2008.07.19"]
[Round "2"]
[White "Farrand, Tom"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "2266"]
[PlyCount "53"]
[EventDate "2008.07.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "BEL"]
[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. d4 c6 5. Nf3 Nf6 6. Be2 Bf5 7. 0-0 e6 8. Ne5 Bb4 9. Bd2 Qd8 10. a3 Be7 11. Bf4 0-0 12. Bf3 Nd5 13. Nxd5 exd5 14. c3 Nd7 15. Bg4 Bxg4 16. Nxg4 Nf6 17. Re1 Re8 18. Re3 Bd6 19. Bg5 Rxe3 20. Nxe3 h6 21. Bh4 g5 22. Bg3 Bxg3 23. hxg3 Qd7 24. Qf3 Ne4 25. Nf5 Kh7 26. g4 Re8 27. Qd3 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.27"]
[Round "7"]
[White "Geertsma, Folkert Jan"]
[Black "Van Briemen, Willem Jan"]
[Result "1/2-1/2"]
[ECO "A29"]
[WhiteElo "1858"]
[BlackElo "2001"]
[PlyCount "48"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bb4 5. Bg2 0-0 6. 0-0 Bxc3 7. bxc3 e4 8. Nd4 Re8 9. d3 exd3 10. exd3 Nxd4 11. cxd4 d5 12. Bg5 h6 13. Bxf6 Qxf6 14. Bxd5 c6 15. Be4 Qxd4 16. Qb3 Bh3 17. Rfb1 Re7 18. Qb2 Qd6 19. Qc3 Rd8 20. Re1 Rde8 21. Bg2 Bxg2 22. Kxg2 c5 23. Rxe7 Rxe7 24. Re1 Rxe1 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.20"]
[Round "6"]
[White "Verheijen, Jan"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "A22"]
[WhiteElo "1611"]
[BlackElo "1858"]
[PlyCount "94"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. g3 c6 4. Bg2 d6 5. Nf3 Be7 6. 0-0 0-0 7. d3 Bd7 8. e4 Ne8 9. c5 Bg4 10. cxd6 Qxd6 11. Qe2 Na6 12. Be3 Nec7 13. Rfd1 Ne6 14. Rac1 Rfd8 15. h3 Bxf3 16. Qxf3 Nd4 17. Qg4 g6 18. f4 h5 19. fxe5 Qxe5 20. Qf4 Qxf4 21. gxf4 Bc5 22. Kf2 Rd7 23. h4 Be7 24. Kg3 Nb4 25. Bh3 Rdd8 26. Bf1 Bc5 27. Rd2 Nf5+ 28. exf5 Bxe3 29. Rcd1 Bxd2 30. Rxd2 Kg7 31. a3 Na6 32. fxg6 fxg6 33. Ne4 Nc7 34. Nc5 b6 35. Ne4 Ne6 36. Ng5 Nxg5 37. fxg5 Re8 38. Bg2 Rac8 39. Be4 c5 40. Bb7 Rc7 41. Ba6 Rf7 42. Bc4 Re3+ 43. Kg2 Rf5 44. Rf2 Rxf2+ 45. Kxf2 Rh3 46. b4 Rxh4 47. bxc5 bxc5 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.13"]
[Round "5"]
[White "Geertsma, Folkert Jan"]
[Black "Bingen, Stanley"]
[Result "1-0"]
[ECO "A21"]
[WhiteElo "1858"]
[BlackElo "1232"]
[PlyCount "75"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Bb4 3. Qc2 Nf6 4. a3 Be7 5. Nf3 d6 6. h3 Nc6 7. d3 Be6 8. g3 h6 9. Bg2 Qd7 10. b4 Bf5 11. Be3 Bh7 12. Rc1 a5 13. b5 Nb8 14. Nxe5 Qc8 15. Nf3 0-0 16. a4 Nbd7 17. Nd2 Ne5 18. f4 Ned7 19. Bf2 Rb8 20. Nb3 b6 21. Nd4 Qe8 22. Nc6 Rc8 23. 0-0 Nc5 24. e4 Nfd7 25. d4 Ne6 26. Nd5 Bf6 27. Qd1 Nd8 28. e5 Nxc6 29. bxc6 dxe5 30. cxd7 Qxd7 31. dxe5 Be7 32. Nf6+ Kh8 33. Qxd7 Bxf6 34. exf6 gxf6 35. Bd4 Kg7 36. Qg4+ Bg6 37. Qh4 Bd3 38. Qxf6+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.06"]
[Round "4"]
[White "Huizer, Olivier"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "1712"]
[BlackElo "1858"]
[PlyCount "46"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 c6 5. Nf3 Nf6 6. Bd2 Qc7 7. Bd3 Bg4 8. Qe2 e6 9. h3 Bxf3 10. Qxf3 Nbd7 11. 0-0 Bd6 12. Rfe1 0-0 13. Ne4 Rfe8 14. Nxd6 Qxd6 15. Qf4 Qxf4 16. Bxf4 Rad8 17. Bg5 h6 18. Bh4 Rc8 19. Rad1 Nh5 20. f3 a6 21. Rd2 Nf4 22. Bf1 Kf8 23. Bg3 Kg8 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.30"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Aalbers, Klaas"]
[Result "1/2-1/2"]
[ECO "D10"]
[WhiteElo "1858"]
[BlackElo "1793"]
[PlyCount "27"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 c6 2. d4 d5 3. cxd5 cxd5 4. Nc3 e6 5. Bf4 a6 6. a3 f5 7. e3 Nf6 8. Nf3 Bd6 9. Bxd6 Qxd6 10. Ne5 Bd7 11. Be2 0-0 12. f4 Qe7 13. 0-0 Nc6 14. Rc1 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.23"]
[Round "2"]
[White "De Heer, Machiel"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "B11"]
[WhiteElo "2192"]
[BlackElo "1858"]
[PlyCount "87"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d5 2. Nc3 c6 3. Nf3 Bg4 4. h3 Bh5 5. d4 e6 6. Bd3 dxe4 7. Nxe4 Nf6 8. Bg5 Be7 9. Bxf6 Bxf6 10. c3 Bg6 11. Qe2 Qe7 12. 0-0-0 Nd7 13. g4 Bxe4 14. Qxe4 0-0-0 15. h4 h6 16. Kb1 Qd6 17. g5 hxg5 18. hxg5 Be7 19. c4 c5 20. Rxh8 Rxh8 21. d5 exd5 22. cxd5 Kb8 23. Bb5 f6 24. Re1 Bd8 25. Qe6 Kc7 26. Nd2 a6 27. Qxd6+ Kxd6 28. Ne4+ Kc7 29. Bxd7 Kxd7 30. Nxc5+ Kc8 31. d6 fxg5 32. Rc1 Bf6 33. d7+ Kc7 34. Rd1 Kc6 35. Ne6 Bd8 36. b4 Rg8 37. a4 b5 38. axb5+ axb5 39. Kc2 g6 40. f3 Rh8 41. Rd4 Rg8 42. Kd2 Rh8 43. Kd3 Rg8 44. Ke4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.07.07"]
[Round "7"]
[White "Bakker, Joop"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "C00"]
[WhiteElo "1879"]
[BlackElo "1931"]
[PlyCount "46"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 dxe4 3. Nxe4 e6 4. Nf3 Be7 5. Bc4 Nf6 6. Ng3 0-0 7. 0-0 b6 8. Qe2 Bb7 9. d3 Nc6 10. Bd2 Nd4 11. Nxd4 Qxd4 12. Bc3 Qd7 13. Nh5 Qc6 14. Nf4 Rfe8 15. f3 Nd5 16. Bxd5 exd5 17. Qd1 Qh6 18. Nh3 c5 19. Bd2 Qc6 20. Bf4 Bf6 21. c3 Re7 22. Qd2 Rae8 23. Rfe1 Kf8 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.30"]
[Round "6"]
[White "Geertsma, Folkert Jan"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "A29"]
[WhiteElo "1931"]
[BlackElo "1947"]
[PlyCount "36"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bb4 5. Bg2 0-0 6. 0-0 Bxc3 7. bxc3 Re8 8. d3 e4 9. Nd4 d5 10. cxd5 Qxd5 11. Nxc6 Qxc6 12. Qd2 Bf5 13. Bb2 Qd7 14. d4 Ng4 15. Bxe4 Bxe4 16. f3 Bc6 17. fxg4 Qxg4 18. Rf4 Rxe2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.23"]
[Round "5"]
[White "Geragousian, Biaina"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "2034"]
[BlackElo "1931"]
[PlyCount "29"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 c6 5. Bc4 Nf6 6. Nge2 Bf5 7. 0-0 e6 8. Ng3 Bg6 9. Re1 Be7 10. Bd3 Bxd3 11. Qxd3 Nbd7 12. Bf4 0-0 13. a3 Qd8 14. Qe2 Nb6 15. Rad1 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "4"]
[White "Geertsma, Folkert Jan"]
[Black "Gruijters, Dirk"]
[Result "0-1"]
[ECO "D13"]
[WhiteElo "1931"]
[BlackElo "1918"]
[PlyCount "58"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 c6 2. d4 d5 3. cxd5 cxd5 4. Nc3 Nc6 5. Nf3 Nf6 6. e3 Bg4 7. Be2 e6 8. 0-0 Bd6 9. h3 Bh5 10. Bd2 0-0 11. a3 Rc8 12. Rc1 h6 13. b4 Bg6 14. Qb3 Ne4 15. Rfd1 Bb8 16. Be1 Ng5 17. Nxg5 Qxg5 18. Bf3 Ne7 19. Bd2 Qf6 20. Na4 b6 21. Rxc8 Rxc8 22. Rc1 Rd8 23. Qd1 Nf5 24. Nc3 Nh4 25. Bh5 Qg5 26. Bf3 Bh5 27. g4 f5 28. e4 Qxd2 29. Qxd2 Nxf3+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.02"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Leeuwenburgh, Evert"]
[Result "1/2-1/2"]
[ECO "A29"]
[WhiteElo "1931"]
[BlackElo "1987"]
[PlyCount "124"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. d3 Be7 7. Bg2 Be6 8. 0-0 0-0 9. a3 a5 10. Bd2 Nb6 11. Qc1 f6 12. Be3 Nd4 13. Bxd4 exd4 14. Ne4 Bd5 15. Ned2 a4 16. Qc2 c5 17. Nh4 Qd7 18. Rac1 Bxg2 19. Nxg2 Nd5 20. e4 dxe3 21. fxe3 b5 22. Ne4 Rfc8 23. Qf2 Rc6 24. Qf5 Qxf5 25. Rxf5 Rd8 26. Kf2 g6 27. Rf3 f5 28. Nd2 Nf6 29. Ke2 Ng4 30. e4 Nxh2 31. Re3 Ng4 32. Rf3 Bf6 33. exf5 Bxb2 34. Rb1 Bxa3 35. Rxb5 Bb4 36. fxg6 hxg6 37. Rb7 Ne5 38. Re3 Rd7 39. Rb8+ Kf7 40. Rxe5 Bxd2 41. Kxd2 Ra7 42. Ree8 a3 43. Rf8+ Kg7 44. Rg8+ Kh6 45. Ra8 Rca6 46. Rxa7 Rxa7 47. Rh8+ Kg5 48. Rh1 Kg4 49. Nf4 Ra6 50. Ne2 g5 51. Ra1 Kf3 52. Rf1+ Kg2 53. Rg1+ Kf2 54. Ra1 g4 55. Ra2 Ra8 56. Nc3 Kxg3 57. Ke3 Re8+ 58. Ne4+ Kh3 59. Kf2 g3+ 60. Nxg3 Rf8+ 61. Ke2 Kxg3 62. Rxa3 Re8+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.05.26"]
[Round "2"]
[White "Stork, Ornett J"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D11"]
[WhiteElo "2120"]
[BlackElo "1931"]
[PlyCount "44"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 c6 2. c4 d5 3. Nf3 Nf6 4. e3 Bg4 5. Nc3 e6 6. h3 Bxf3 7. Qxf3 Qc7 8. Bd2 Be7 9. Bd3 Nbd7 10. Rc1 Rc8 11. 0-0 0-0 12. e4 dxe4 13. Nxe4 Nxe4 14. Qxe4 Nf6 15. Qe2 Rfd8 16. Bc3 Rd7 17. Bb1 Qd8 18. Qc2 g6 19. Rcd1 Bf8 20. Qa4 Ra8 21. Bc2 Bg7 22. b3 Nh5 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.05.19"]
[Round "1"]
[White "Oei, Hway Ik"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "B18"]
[WhiteElo "2144"]
[BlackElo "1931"]
[PlyCount "43"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 c6 2. e4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nh3 e6 8. Nf4 Bh7 9. Bc4 Nf6 10. Qe2 Nd5 11. Bxd5 cxd5 12. 0-0 Be7 13. Ngh5 0-0 14. Qe5 Bf6 15. Nxf6+ Qxf6 16. Qxf6 gxf6 17. Nh5 Bxc2 18. Bxh6 Rc8 19. Nxf6+ Kh8 20. Rac1 Na6 21. Rfe1 Nb4 22. Re3 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.07.01"]
[Round "7"]
[White "Gorter, Yme"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "B19"]
[WhiteElo "1781"]
[BlackElo "1969"]
[PlyCount "73"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 d5 2. Nc3 c6 3. d4 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 Qc7 11. Bd2 Ngf6 12. 0-0-0 e6 13. Rhe1 0-0-0 14. Qb3 Bd6 15. Qa4 Kb8 16. Ne5 Bxe5 17. dxe5 Nxe5 18. Bf4 Rxd1+ 19. Kxd1 Nfd7 20. Qb4 Re8 21. Ne4 f6 22. Nd6 Rd8 23. Nf7 c5 24. Qc3 Rf8 25. Nxe5 fxe5 26. Bxe5 Nxe5 27. Rxe5 Rf5 28. Rxf5 exf5 29. Qd3 f4 30. Qd5 b6 31. Ke2 Qe7+ 32. Kf3 Qf6 33. c3 g5 34. hxg6 Qxg6 35. Kxf4 Qc2 36. Qe5+ Kc8 37. Qf5+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.24"]
[Round "6"]
[White "Vriend, Wim"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "1998"]
[BlackElo "1969"]
[PlyCount "54"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 c6 5. Nf3 Nf6 6. Bd2 Bg4 7. h3 Bh5 8. g4 Bg6 9. Bc4 e6 10. Ne5 Nbd7 11. Nxg6 hxg6 12. g5 Ng8 13. Qg4 Qf5 14. Qxf5 gxf5 15. g6 Nb6 16. Bb3 Ne7 17. gxf7+ Kxf7 18. 0-0-0 Ned5 19. Ne2 a5 20. a4 g6 21. Rdg1 Bh6 22. Rg3 Bxd2+ 23. Kxd2 Rh6 24. c4 Nf6 25. f3 Rah8 26. Ke3 Nh5 27. Rg2 Kf6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.17"]
[Round "5"]
[White "Geertsma, Folkert Jan"]
[Black "Irwin, Mark"]
[Result "0-1"]
[ECO "A32"]
[WhiteElo "1969"]
[BlackElo "2203"]
[PlyCount "80"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. d4 c5 4. Nf3 cxd4 5. Nxd4 a6 6. e3 Qc7 7. Be2 Be7 8. 0-0 0-0 9. Bd2 d6 10. Qc2 Nc6 11. a3 Bd7 12. f4 Rac8 13. b4 Rfd8 14. Rac1 Qb8 15. Qb1 Qa7 16. Nxc6 Bxc6 17. Kh1 b6 18. e4 Qb7 19. Bf3 b5 20. cxb5 axb5 21. Rce1 Ra8 22. Qb2 Nd7 23. e5 Nb6 24. Bxc6 Qxc6 25. Nb1 Nc4 26. Qc3 Qd5 27. Bc1 dxe5 28. fxe5 Bh4 29. Re2 Rac8 30. Qf3 Nxe5 31. Qxd5 Rxd5 32. Bb2 Nc4 33. Nc3 Rd2 34. Rxd2 Nxd2 35. Rd1 Nc4 36. Bc1 Nxa3 37. Ne4 Nc4 38. g3 Be7 39. Nc5 Bxc5 40. bxc5 f6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.10"]
[Round "4"]
[White "Hortensius, Nick"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "1606"]
[BlackElo "1969"]
[PlyCount "94"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bg4 6. Be2 e6 7. Bd2 c6 8. 0-0 Qc7 9. h3 Bxf3 10. Bxf3 Bd6 11. Re1 Nbd7 12. Ne4 Nxe4 13. Bxe4 Nf6 14. c4 0-0 15. Rc1 Bh2+ 16. Kh1 Bf4 17. g3 Bxd2 18. Qxd2 Rfd8 19. Bg2 Qd6 20. Red1 Rd7 21. Rc3 Rad8 22. Rd3 Qc7 23. Qc2 h6 24. R1d2 Ne8 25. Qa4 a6 26. d5 cxd5 27. cxd5 Nf6 28. d6 Rxd6 29. Rxd6 Rxd6 30. Rxd6 Qxd6 31. Bxb7 Qb6 32. Qxa6 Qxf2 33. Qa3 Nh5 34. Bg2 Nxg3+ 35. Kh2 Ne2 36. Qa8+ Kh7 37. Qe4+ f5 38. Qb1 Qf4+ 39. Kh1 e5 40. b4 e4 41. b5 Ng3+ 42. Kg1 Ne2+ 43. Kh1 Nc3 44. Qb2 Nd1 45. Qb1 Ne3 46. b6 Qb8 47. Bxe4 g6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.05.27"]
[Round "2"]
[White "Geertsma, Folkert Jan"]
[Black "Bingen, Stanley"]
[Result "1-0"]
[ECO "E24"]
[WhiteElo "1969"]
[BlackElo "1187"]
[PlyCount "75"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. c4 Nc6 2. Nc3 e6 3. d4 Bb4 4. a3 Bxc3+ 5. bxc3 Nf6 6. Bg5 h6 7. Bh4 g5 8. Bg3 Ne4 9. Qc2 f5 10. e3 b6 11. f3 Nd6 12. Bd3 Ba6 13. d5 Na5 14. dxe6 dxe6 15. Rd1 Naxc4 16. Bxd6 Nxe3 17. Qa4+ b5 18. Qxa6 Nxd1 19. Qxb5+ Kf7 20. Be5 Rb8 21. Qc4 Ne3 22. Qxc7+ Qxc7 23. Bxc7 Rbc8 24. Be5 Rhd8 25. Ke2 Nxg2 26. Nh3 Rc5 27. Bd4 Rcd5 28. Bc4 Ra5 29. Rg1 Nh4 30. Nxg5+ hxg5 31. Rxg5 Rg8 32. Bxe6+ Kxe6 33. Rxg8 Rxa3 34. Rh8 Ra2+ 35. Kd3 a5 36. Rxh4 a4 37. Rh6+ Kd5 38. c4# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.05.20"]
[Round "1"]
[White "Glimmerveen, Martin"]
[Black "Geertsma, Folkert Jan"]
[Result "1/2-1/2"]
[ECO "D37"]
[WhiteElo "1696"]
[BlackElo "1969"]
[PlyCount "53"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. d4 c6 2. c4 d5 3. Nf3 Nf6 4. Bf4 e6 5. e3 Be7 6. Nc3 0-0 7. Bd3 Nbd7 8. 0-0 dxc4 9. Bxc4 b5 10. Bd3 a6 11. Rc1 c5 12. dxc5 Nxc5 13. Bb1 Bb7 14. a3 Qxd1 15. Rfxd1 Nb3 16. Rc2 Rfd8 17. Nd4 Nxd4 18. exd4 Rac8 19. Rcd2 Nd5 20. Nxd5 Bxd5 21. f3 Bf6 22. Be3 Rc7 23. Bc2 Rdc8 24. Be4 Bb3 25. Re1 Rd7 26. Rd3 Bc4 27. Rd2 1/2-1/2

[Event "NED-ch42 sf-A"]
[Site "Eindhoven"]
[Date "1986.11.30"]
[Round "7"]
[White "Henneberke, Frans"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "D02"]
[PlyCount "90"]
[EventDate "1986.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 c6 2. Nf3 d5 3. Bf4 Qb6 4. Qc1 Nf6 5. e3 Bf5 6. Nbd2 e6 7. Be2 Nbd7 8. 0-0 Be7 9. c4 c5 10. b3 0-0 11. Qb2 Bg6 12. Ne5 Nxe5 13. Bxe5 Rfd8 14. Rfd1 Ne8 15. cxd5 exd5 16. dxc5 Bxc5 17. Nf3 Be4 18. Bd4 Bxd4 19. Qxd4 Qg6 20. Rac1 Rd6 21. Ne1 a6 22. f3 Bf5 23. Nd3 Bxd3 24. Bxd3 Qg5 25. Rc3 f5 26. b4 Rad8 27. Bc2 Rg6 28. Rd2 h5 29. Bb3 Kh8 30. a4 h4 31. h3 Qg3 32. Kf1 Nf6 33. Rc4 dxc4 34. Qxd8+ Kh7 35. Bxc4 Qh2 36. Rf2 Qh1+ 37. Ke2 Rxg2 38. Qc8 Rxf2+ 39. Kxf2 Qxh3 40. Be6 Qg3+ 41. Ke2 Qg2+ 42. Kd3 Qxf3 43. Bxf5+ g6 44. Qc7+ Kh6 45. Bc8 Qd1+ 0-1

[Event "NED-ch42 sf-A"]
[Site "Eindhoven"]
[Date "1986.11.29"]
[Round "6"]
[White "Geertsma, Folkert Jan"]
[Black "Bierenbroodspot, Paul"]
[Result "1/2-1/2"]
[ECO "A00"]
[PlyCount "87"]
[EventDate "1986.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. b4 e5 2. Bb2 Bxb4 3. Bxe5 Nf6 4. Nf3 d5 5. e3 0-0 6. c4 Nc6 7. Bb2 Bg4 8. Be2 Re8 9. 0-0 Bd6 10. cxd5 Nxd5 11. Nc3 Re6 12. Nxd5 Bxf3 13. Nf6+ Rxf6 14. Bxf6 Bxe2 15. Bxd8 Bxd1 16. Bxc7 Bxc7 17. Rfxd1 Rd8 18. d4 Rd5 19. Rab1 Bb6 20. Kf1 f5 21. Ke2 Kf7 22. h3 g5 23. g4 f4 24. h4 h5 25. Kf3 hxg4+ 26. Kxg4 fxe3 27. fxe3 gxh4 28. Kxh4 Ra5 29. Rd2 Ke6 30. Kg4 Ne7 31. Kf4 Nd5+ 32. Kf3 Nc3 33. Rbb2 Rf5+ 34. Kg4 Rf7 35. Rb3 Ne4 36. Rc2 Nd6 37. Rh2 Nf5 38. Rh5 Bd8 39. Rd3 Rg7+ 40. Kf4 Bc7+ 41. Kf3 Rf7 42. Kg4 Rg7+ 43. Kf3 Rf7 44. Kg4 1/2-1/2

[Event "NED-ch42 sf-A"]
[Site "Eindhoven"]
[Date "1986.11.16"]
[Round "5"]
[White "Geertsma, Folkert Jan"]
[Black "Timmerman, Gert Jan"]
[Result "0-1"]
[ECO "A10"]
[BlackElo "2315"]
[PlyCount "48"]
[EventDate "1986.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. c4 f5 2. h3 d6 3. d4 c5 4. dxc5 Qa5+ 5. Nd2 dxc5 6. e4 fxe4 7. Ne2 Nf6 8. Nc3 e6 9. Qe2 Be7 10. Ndxe4 0-0 11. Bd2 Nc6 12. Nb5 Qb6 13. Rb1 Nd4 14. Nxd4 cxd4 15. Ng5 e5 16. Qxe5 Bc5 17. Kd1 Re8 18. Qg3 h6 19. b4 hxg5 20. Qb3 Ne4 21. Be1 Nc3+ 22. Bxc3 dxc3 23. Bd3 Qf6 24. bxc5 Bf5 0-1

[Event "NED-ch42 sf-A"]
[Site "Eindhoven"]
[Date "1986.11.15"]
[Round "4"]
[White "Okkes, Menno"]
[Black "Geertsma, Folkert Jan"]
[Result "1-0"]
[ECO "D27"]
[PlyCount "37"]
[EventDate "1986.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. c4 c6 2. e4 d5 3. exd5 cxd5 4. cxd5 Qxd5 5. Nc3 Qd8 6. d4 Nf6 7. Bc4 e6 8. Nf3 Be7 9. 0-0 0-0 10. Qe2 Nc6 11. Rd1 Nb4 12. Ne5 a6 13. Bb3 Nbd5 14. Rd3 Bb4 15. Bg5 Qb6 16. Rad1 Qc7 17. Rg3 Re8 18. Qf3 Bxc3 19. Bxf6 1-0

[Event "NED-ch42 sf-A"]
[Site "Eindhoven"]
[Date "1986.11.14"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Van der Tuuk, Jaap"]
[Result "1/2-1/2"]
[ECO "E67"]
[PlyCount "122"]
[EventDate "1986.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. Nf3 Bg7 4. g3 0-0 5. Bg2 d6 6. d4 Nbd7 7. 0-0 e5 8. dxe5 dxe5 9. Qc2 Re8 10. Rd1 c6 11. Bg5 Qa5 12. Qd2 Qb4 13. Ne4 Qxd2 14. Nfxd2 h6 15. Nxf6+ Nxf6 16. Bxf6 Bxf6 17. Ne4 Be7 18. Nd6 Bxd6 19. Rxd6 Be6 20. b3 a5 21. a4 Kf8 22. Kf1 Ke7 23. Rad1 Ra6 24. Be4 Rb6 25. Bc2 Rb4 26. Ke1 Bd5 27. R6xd5 cxd5 28. Rxd5 Ke6 29. Rxa5 Rd8 30. e4 Rd4 31. f4 f6 32. Rd5 g5 33. fxe5 fxe5 34. Ke2 Rb6 35. Ke3 Rd6 36. Bd3 b6 37. Rxd4 exd4+ 38. Kf3 h5 39. h4 gxh4 40. gxh4 Ke5 41. b4 Rd8 42. b5 Ra8 43. Bc2 d3 44. Bxd3 Rxa4 45. Be2 Ra3+ 46. Kf2 Rh3 47. Bxh5 Rxh4 48. Bg6 Rh3 49. Ke2 Rc3 50. Bf7 Kxe4 51. Kd2 Kd4 52. Bd5 Rh3 53. Kc2 Kc5 54. Kd2 Ra3 55. Kc2 Kd4 56. Kb2 Re3 57. Kc2 Re2+ 58. Kb3 Rf2 59. Bc6 Rf1 60. Bd5 Re1 61. Bf7 Kc5 1/2-1/2

[Event "NED-ch42 sf-A"]
[Site "Eindhoven"]
[Date "1986.11.09"]
[Round "2"]
[White "Visser, Yge"]
[Black "Geertsma, Folkert Jan"]
[Result "0-1"]
[ECO "B19"]
[WhiteElo "2290"]
[PlyCount "94"]
[EventDate "1986.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. h4 h6 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 Qc7 11. Bd2 e6 12. 0-0-0 0-0-0 13. Ne4 Ngf6 14. g3 Nxe4 15. Qxe4 Nf6 16. Qe2 Bd6 17. c4 c5 18. Bc3 cxd4 19. Nxd4 Qe7 20. Nb5 Bc5 21. Qe5 Ng4 22. Qf4 Nxf2 23. Bb4 Nd3+ 24. Rxd3 Rxd3 25. Kc2 e5 26. Qg4+ Rd7 27. Bxc5 Qxc5 28. Rd1 Rhd8 29. Rd5 Qf2+ 30. Kb3 f5 31. Qg6 Qe3+ 32. Ka4 Rxd5 33. cxd5 Qe4+ 34. b4 Qxd5 35. Qxf5+ Qd7 36. Qc2+ Kb8 37. Qc5 Qd1+ 38. Ka3 Rd3+ 39. Nc3 Qc1+ 40. Kb3 Rxc3+ 41. Qxc3 Qxc3+ 42. Kxc3 Kc7 43. Kd3 Kd6 44. Ke4 Ke6 45. b5 Kd6 46. g4 Ke6 47. a3 a5 0-1

[Event "NED-ch42 sf-A"]
[Site "Eindhoven"]
[Date "1986.11.08"]
[Round "1"]
[White "Geertsma, Folkert Jan"]
[Black "Douven, Rudy C"]
[Result "0-1"]
[ECO "D79"]
[BlackElo "2415"]
[PlyCount "130"]
[EventDate "1986.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. Nf3 Bg7 4. g3 0-0 5. Bg2 c6 6. 0-0 d5 7. cxd5 cxd5 8. d4 Nc6 9. Re1 b6 10. Ne5 Bb7 11. Nxc6 Bxc6 12. Bd2 Qd7 13. b4 Rac8 14. a4 Ne4 15. Nxe4 dxe4 16. b5 Bd5 17. e3 f5 18. Rc1 e5 19. dxe5 Bxe5 20. Bb4 Rfd8 21. Qd2 Rxc1 22. Rxc1 Bb3 23. Qxd7 Rxd7 24. a5 Bb2 25. Re1 Rc7 26. Bf1 Bc2 27. Kg2 Kf7 28. Be2 Ke6 29. h4 Kd5 30. h5 g5 31. axb6 axb6 32. Bd1 Bd3 33. Bb3+ Ke5 34. Rd1 g4 35. Bf8 Kf6 36. h6 Kg6 37. Bd6 Rc3 38. Be6 Be2 39. Rb1 Rc2 40. Bb3 Rc8 41. Be6 Rc2 42. Bb3 Rc8 43. Be6 Re8 44. Bxf5+ Kxf5 45. Rxb2 Bf3+ 46. Kf1 Rd8 47. Bb4 Rd5 48. Bc3 Rd1+ 49. Be1 Rd6 50. Bb4 Rxh6 51. Ke1 Rh2 52. Be7 Ke6 53. Bh4 Kd5 54. Bf6 Kc4 55. Bd4 Rh1+ 56. Kd2 Rd1+ 57. Kc2 Rf1 58. Bxb6 Bd1+ 59. Kc1 Ba4+ 60. Kd2 Rxf2+ 61. Kc1 Rf1+ 62. Kd2 Rg1 63. Bc7 Bxb5 64. Rc2+ Kd5 65. Kc3 Bd3 0-1

