[Event "Groninger Combinatie op"]
[Site "Groningen"]
[Date "2019.06.02"]
[Round "6"]
[White "Duijker, Rick"]
[Black "Seijen, Henk G"]
[Result "1/2-1/2"]
[ECO "B06"]
[WhiteElo "2164"]
[BlackElo "1750"]
[PlyCount "140"]
[EventDate "2019.05.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 190 Extra"]
[Source "ChessBase"]
[SourceDate "2019.07.15"]
[SourceVersion "1"]
[SourceVersionDate "2019.07.15"]
[SourceQuality "1"]

1. d4 g6 2. e4 Bg7 3. Nc3 d6 4. Be3 a6 5. Qd2 Nd7 6. 0-0-0 b5 7. f3 Nb6 8. Bd3 Nf6 9. g4 h5 10. g5 Nfd7 11. Nge2 c5 12. dxc5 dxc5 13. Nd5 0-0 14. Nxb6 Qxb6 15. f4 Bb7 16. Rhe1 Rfd8 17. e5 Qe6 18. Qa5 c4 19. Nd4 Qb6 20. Qxb6 Nxb6 21. Bf1 Nd5 22. Bd2 e6 23. c3 Bf8 24. Bg2 Rab8 25. Bxd5 Bxd5 26. Be3 b4 27. Ne2 Be4 28. Ba7 Rbc8 29. Bb6 Rxd1+ 30. Kxd1 Bd3 31. Ba5 Bxe2+ 32. Kxe2 bxc3 33. Bxc3 Rd8 34. Rd1 Rxd1 35. Kxd1 Bc5 36. Ke2 Kf8 37. a3 Ke8 38. Kf3 Kd7 39. Ke4 Bg1 40. h3 Kc6 41. Bd4 Bh2 42. Be3 Bg3 43. a4 Be1 44. Kd4 c3 45. bxc3 Bg3 46. Kd3 Be1 47. c4 Bb4 48. Bd2 Bc5 49. Kc3 Kb6 50. Kc2 Kc6 51. Kd3 Ba3 52. Be3 Bb4 53. Bf2 Ba3 54. Kc2 Bb4 55. Be3 Ba5 56. Kb2 Be1 57. Kb3 Ba5 58. Bc1 Be1 59. Be3 Ba5 60. Kc2 Be1 61. Kd3 Bb4 62. Bd4 Be1 63. Bc3 Bf2 64. Bb4 Bb6 65. Ke4 Bf2 66. Bc3 Bc5 67. Bd4 Bb4 68. Bb2 Bc5 69. Bc3 Ba3 70. Bd4 Bb4 1/2-1/2

[Event "Groninger Combinatie op"]
[Site "Groningen"]
[Date "2019.06.02"]
[Round "7"]
[White "Seijen, Henk G"]
[Black "Nicolai, Amir"]
[Result "0-1"]
[ECO "B33"]
[WhiteElo "1750"]
[BlackElo "2095"]
[PlyCount "56"]
[EventDate "2019.05.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 190 Extra"]
[Source "ChessBase"]
[SourceDate "2019.07.15"]
[SourceVersion "1"]
[SourceVersionDate "2019.07.15"]
[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. Bd3 Ne7 12. Nxe7 Qxe7 13. c3 f5 14. Nc2 Qb7 15. Qe2 fxe4 16. Qxe4 d5 17. Qh4 f5 18. 0-0-0 0-0 19. f3 a5 20. Ne3 b4 21. Nxd5 Kh8 22. c4 Be6 23. g4 Bxd5 24. cxd5 Qxd5 25. Kb1 e4 26. Be2 Qe5 27. Rd2 b3 28. a3 e3 0-1

[Event "Groninger Combinatie op"]
[Site "Groningen"]
[Date "2019.06.01"]
[Round "5"]
[White "Seijen, Henk G"]
[Black "Schulz, Daniel"]
[Result "1-0"]
[ECO "C05"]
[WhiteElo "1750"]
[BlackElo "2092"]
[PlyCount "45"]
[EventDate "2019.05.30"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 190 Extra"]
[Source "ChessBase"]
[SourceDate "2019.07.15"]
[SourceVersion "1"]
[SourceVersionDate "2019.07.15"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. Bd3 c5 5. c3 Nc6 6. Ngf3 cxd4 7. cxd4 Nb4 8. Bb1 dxe4 9. Nxe4 Be7 10. 0-0 h6 11. Nxf6+ Bxf6 12. Re1 Be7 13. Ne5 0-0 14. a3 Nd5 15. Qd3 Nf6 16. Ng4 Re8 17. Bd2 a5 18. Re3 b6 19. Rg3 h5 20. Nh6+ Kf8 21. Nxf7 Qd5 22. Qg6 Ng4 23. Ne5 1-0

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.13"]
[Round "7"]
[White "Seijen, Henk G"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "1806"]
[BlackElo "2140"]
[PlyCount "102"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 Bg7 5. f3 0-0 6. Qd2 e5 7. dxe5 dxe5 8. 0-0-0 Qxd2+ 9. Rxd2 Be6 10. Bb5 Nbd7 11. Nge2 c6 12. Ba4 Nb6 13. Bb3 Nc4 14. Bxc4 Bxc4 15. Rhd1 b5 16. Kb1 a5 17. Nc1 Rfc8 18. Nd3 Nd7 19. Nc5 Nxc5 20. Bxc5 Be6 21. Be7 f6 22. Rd8+ Kf7 23. Rxc8 Rxc8 24. Bc5 a4 25. a3 h5 26. Na2 Rc7 27. Nb4 Rd7 28. Rxd7+ Bxd7 29. Kc1 Bh6+ 30. Kd1 Ke8 31. Ke2 Be6 32. b3 axb3 33. cxb3 Kd7 34. a4 Bxb3 35. a5 Bc4+ 36. Kd1 Kc7 37. a6 Be6 38. a7 Kb7 39. Nxc6 Bd7 40. Nb4 f5 41. Nd5 Bc6 42. Ne7 Bf8 43. Nxc6 Bxc5 44. Nxe5 fxe4 45. fxe4 g5 46. Nd3 Bxa7 47. Kc2 Kc6 48. Kb3 Bb8 49. h3 Bd6 50. g4 hxg4 51. hxg4 Be7 1/2-1/2

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.12"]
[Round "5"]
[White "Seijen, Henk G"]
[Black "Elgersma, Simon"]
[Result "0-1"]
[ECO "C02"]
[WhiteElo "1806"]
[BlackElo "2239"]
[PlyCount "32"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7 6. Be2 f6 7. 0-0 fxe5 8. Nxe5 Nxe5 9. dxe5 Qc7 10. f4 0-0-0 11. Be3 Ne7 12. Kh1 g5 13. b4 Nf5 14. Bg1 gxf4 15. Bxc5 Bxc5 16. bxc5 Ne3 0-1

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2017.05.25"]
[Round "1"]
[White "Seijen, Henk G"]
[Black "Clemens, Adrian HP"]
[Result "0-1"]
[ECO "B45"]
[WhiteElo "1816"]
[BlackElo "2201"]
[PlyCount "48"]
[EventDate "2017.05.25"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Be2 Nf6 6. Nc3 Bb4 7. Nxc6 bxc6 8. 0-0 0-0 9. Qd4 Qb6 10. Qxb6 axb6 11. e5 Nd5 12. Ne4 f5 13. Nd6 Bxd6 14. exd6 Nb4 15. c3 Ba6 16. Bxa6 Nxa6 17. Be3 f4 18. Bxb6 Rfb8 19. Bc7 Rxb2 20. Rfb1 Rc2 21. Rb7 e5 22. f3 Kf7 23. Re1 Nc5 24. Bb6 Nxb7 0-1

[Event "Groningen Atlantis op-B"]
[Site "Groningen"]
[Date "2013.08.22"]
[Round "1"]
[White "Hilwerda, Jonas"]
[Black "Seijen, Henk G"]
[Result "1-0"]
[ECO "B86"]
[BlackElo "1877"]
[PlyCount "143"]
[EventDate "2013.08.22"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bc4 Be7 7. 0-0 0-0 8. Be3 Nxe4 9. Nxe4 d5 10. Bxd5 exd5 11. Nc3 Nc6 12. Qf3 Be6 13. Rfd1 Qd7 14. Rd2 Rfd8 15. h3 Ne5 16. Qg3 Nc4 17. Re2 Rac8 18. Nxe6 fxe6 19. Bd4 Bd6 20. Qg5 Rf8 21. Rxe6 Bf4 22. Re7 Rf7 23. Rxd7 Bxg5 24. Rxd5 Bf6 25. Ne4 Bxd4 26. Rxd4 Nxb2 27. c3 Rc4 28. Rb1 Rxd4 29. cxd4 Nd3 30. d5 Rd7 31. d6 b6 32. Kf1 Kf7 33. Ke2 Nc5 34. Nxc5 bxc5 35. Rb5 Ke6 36. Rxc5 Kxd6 37. Rc3 Rb7 38. Rb3 Rf7 39. Rf3 Rb7 40. Rb3 Rf7 41. g3 Kc5 42. f4 Kd4 43. Kd2 Rc7 44. g4 g6 45. Rb4+ Kd5 46. h4 Kc5 47. Rb3 Kd4 48. Rb4+ Kd5 49. Kd3 Re7 50. Rd4+ Kc5 51. f5 gxf5 52. gxf5 Rf7 53. Ke4 Re7+ 54. Kd3 Rf7 55. Ke4 Re7+ 56. Kd3 Rf7 57. Ra4 Kb5 58. Rf4 Kc5 59. Ra4 Kb5 60. Rf4 Kc5 61. Ke4 Re7+ 62. Kf3 Kd5 63. f6 Rf7 64. Kg4 Ke5 65. Kg5 Kd5 66. Kf5 Rb7 67. Re4 Kd6 68. Re6+ Kd5 69. Re7 Rb2 70. Rxa7 Rf2+ 71. Kg5 Ke6 72. f7 1-0

[Event "Groningen Compact op-B"]
[Site "Groningen"]
[Date "2008.12.26"]
[Round "1"]
[White "Henries, Alidston"]
[Black "Seijen, Henk G"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "1857"]
[PlyCount "43"]
[EventDate "2008.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 127 Extra"]
[Source "ChessBase"]
[SourceDate "2009.01.08"]
[SourceVersion "2"]
[SourceVersionDate "2009.01.28"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 a6 3. g3 b5 4. Bg2 Bb7 5. Nge2 e6 6. 0-0 Be7 7. Re1 d6 8. d4 Nd7 9. a4 b4 10. Na2 Qc7 11. c3 a5 12. Nf4 Nb6 13. dxc5 dxc5 14. Be3 Nf6 15. Rc1 Qd7 16. cxb4 Qxa4 17. Bxc5 Qxa2 18. Bxe7 Kxe7 19. Qd4 Rhd8 20. Qxb6 Ba6 21. Qc6 Bc8 22. Qxa8 1-0

[Event "Groningen op"]
[Site "Groningen"]
[Date "2007.04.15"]
[Round "6"]
[White "Seijen, Henk G"]
[Black "Bijlsma, Nick"]
[Result "0-1"]
[ECO "B90"]
[PlyCount "74"]
[EventDate "2007.04.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 118 Extra"]
[Source "ChessBase"]
[SourceDate "2007.07.04"]
[SourceVersion "1"]
[SourceVersionDate "2007.07.04"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be6 8. f3 Nbd7 9. Qd2 b5 10. 0-0-0 Rc8 11. Kb1 Be7 12. g4 Nb6 13. Bxb6 Qxb6 14. Nd5 Nxd5 15. exd5 Bd7 16. Bd3 b4 17. Rhg1 a5 18. f4 a4 19. Nc1 0-0 20. fxe5 dxe5 21. Qe1 Qc7 22. g5 a3 23. Nb3 Bb5 24. Qe2 Bxd3 25. Rxd3 e4 26. Rd4 e3 27. Rd3 Qe5 28. Nd4 Bxg5 29. c3 bxc3 30. Nf3 c2+ 31. Qxc2 Rxc2 32. Nxe5 Rxb2+ 33. Ka1 Rfb8 34. Nd7 Re8 35. Rxa3 Rb7 36. Rxg5 e2 37. Nf6+ Kh8 0-1

[Event "Groningen op"]
[Site "Groningen"]
[Date "2007.04.13"]
[Round "1"]
[White "Heller, Martin"]
[Black "Seijen, Henk G"]
[Result "1/2-1/2"]
[ECO "E81"]
[PlyCount "51"]
[EventDate "2007.04.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 118 Extra"]
[Source "ChessBase"]
[SourceDate "2007.07.04"]
[SourceVersion "1"]
[SourceVersionDate "2007.07.04"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Bg5 Na6 7. Qd2 c5 8. d5 Nc7 9. Bd3 e6 10. Nge2 exd5 11. exd5 Qd7 12. Bh6 b5 13. Bxg7 Kxg7 14. b3 Re8 15. 0-0 Qe7 16. Rfe1 Qe5 17. Qf4 Bd7 18. Qxe5 Rxe5 19. Ng3 Rae8 20. Kf2 Rxe1 21. Rxe1 Rxe1 22. Kxe1 b4 23. Nce4 Nce8 24. Ke2 Nxe4 25. Nxe4 f5 26. Nf2 1/2-1/2

[Event "Hoogeveen Essent Amateur"]
[Site "Hoogeveen"]
[Date "2004.10.23"]
[Round "9"]
[White "Seijen, Henk G"]
[Black "Karsdorp, Nico"]
[Result "0-1"]
[ECO "B02"]
[BlackElo "1941"]
[PlyCount "24"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2005"]
[Source "ChessBase"]
[SourceDate "2004.11.15"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.15"]
[SourceQuality "1"]

1. e4 Nf6 2. Nc3 d5 3. e5 Ne4 4. d4 Bf5 5. Nxe4 Bxe4 6. Ne2 e6 7. Ng3 Bg6 8. h4 h6 9. Nh5 c5 10. Bb5+ Nc6 11. c3 cxd4 12. cxd4 Qa5+ 0-1

[Event "Hoogeveen Essent Amateur"]
[Site "Hoogeveen"]
[Date "2004.10.22"]
[Round "8"]
[White "Knol, Wout"]
[Black "Seijen, Henk G"]
[Result "0-1"]
[ECO "A68"]
[PlyCount "92"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2005"]
[Source "ChessBase"]
[SourceDate "2004.11.15"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.15"]
[SourceQuality "1"]

1. d4 d6 2. c4 g6 3. Nc3 Nf6 4. e4 Bg7 5. f4 0-0 6. Nf3 c5 7. d5 e6 8. Bd3 exd5 9. cxd5 c4 10. Bc2 Qb6 11. Na4 Qd8 12. 0-0 b5 13. Nc3 Qb6+ 14. Kh1 Re8 15. Qe1 Nbd7 16. Be3 Nc5 17. Bd4 Bg4 18. Qh4 Bxf3 19. gxf3 Nh5 20. Bxg7 Kxg7 21. Rg1 Kh8 22. Rad1 a5 23. e5 dxe5 24. fxe5 Rxe5 25. Qd4 Nd7 26. Qxb6 Nxb6 27. Rge1 Rae8 28. Rxe5 Rxe5 29. d6 Nf6 30. Ne4 Nfd7 31. Ng3 f5 32. Kg2 Kg7 33. Kf2 Kf6 34. Ne2 Rd5 35. Nd4 Ke5 36. f4+ Kxf4 37. Ne6+ Ke5 38. Nc7 Rxd1 39. Bxd1 b4 40. Nb5 Kd5 41. Bf3+ Kc5 42. Na7 Ne5 43. Be2 Kxd6 44. Ke3 Kc5 45. h3 Nd5+ 46. Kd2 Ne7 0-1

[Event "Hoogeveen Essent Amateur"]
[Site "Hoogeveen"]
[Date "2004.10.19"]
[Round "5"]
[White "Seijen, Henk G"]
[Black "Veldman, Jan"]
[Result "1-0"]
[ECO "B42"]
[PlyCount "29"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2005"]
[Source "ChessBase"]
[SourceDate "2004.11.15"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.15"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 b5 6. a4 b4 7. Nd2 Bb7 8. 0-0 Ne7 9. Kh1 Nbc6 10. N2b3 Nxd4 11. Nxd4 Nc6 12. Be3 Ne5 13. f4 Nxd3 14. cxd3 Bc5 15. Nxe6 1-0

[Event "Groningen Harmonie Mini"]
[Site "Groningen"]
[Date "2004.??.??"]
[Round "2"]
[White "Seijen, Henk G"]
[Black "Colly, Jan"]
[Result "0-1"]
[ECO "B42"]
[PlyCount "55"]
[EventDate "2004.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Qc7 6. 0-0 Bc5 7. Nb3 Ba7 8. Qg4 g6 9. Nc3 d6 10. Kh1 Nd7 11. Bg5 h6 12. Bd2 Ne5 13. Qe2 Bd7 14. f4 Nc6 15. f5 gxf5 16. exf5 Nge7 17. fxe6 Bxe6 18. Be3 Bxe3 19. Qxe3 0-0-0 20. Rad1 Ne5 21. Nd4 Kb8 22. Nf5 Nxd3 23. Nxe7 Nxb2 24. Rd4 Nc4 25. Qe2 Rde8 26. Re1 Qc5 27. Qf3 Rxe7 28. Rb1 0-1

[Event "Groningen Harmonie Mini"]
[Site "Groningen"]
[Date "2004.??.??"]
[Round "1"]
[White "Van der Zwaag, Bas"]
[Black "Seijen, Henk G"]
[Result "1-0"]
[ECO "B31"]
[PlyCount "65"]
[EventDate "2004.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. 0-0 Bg7 5. c3 Nf6 6. Re1 0-0 7. d4 cxd4 8. cxd4 d5 9. e5 Ne4 10. Nc3 Nxc3 11. bxc3 Bg4 12. Bd3 Rc8 13. Bd2 Na5 14. h3 Bxf3 15. Qxf3 e6 16. Rab1 Qe7 17. Rb4 Nc4 18. Bxc4 Rxc4 19. Rxc4 dxc4 20. Rb1 Rb8 21. Rb4 b5 22. a4 a6 23. Qc6 Qb7 24. axb5 axb5 25. Qxb7 Rxb7 26. Rb1 Bf8 27. Kf1 Kg7 28. Ke2 f5 29. exf6+ Kxf6 30. Kf3 e5 31. d5 Bc5 32. Ke4 Bxf2 33. Rf1 1-0

[Event "Groningen Harmonie Mini op-B"]
[Site "Groningen"]
[Date "2002.12.30"]
[Round "5.2"]
[White "Seijen, Henk G"]
[Black "Hartman, E."]
[Result "1/2-1/2"]
[ECO "C13"]
[WhiteElo "1843"]
[BlackElo "1786"]
[PlyCount "61"]
[EventDate "2002.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Bg5 Be7 7. Bxf6 Nxf6 8. Nxf6+ Bxf6 9. c3 Bd7 10. Bc4 Bc6 11. Qe2 Bd5 12. Bd3 Qe7 13. 0-0 Bxf3 14. Qxf3 c6 15. Rfe1 0-0-0 16. a4 g5 17. a5 g4 18. Qe4 Qd6 19. b4 Qd5 20. a6 b6 21. Qe2 Qd6 22. Rad1 h5 23. b5 c5 24. Be4 Kc7 25. Qc4 Rhf8 26. Rb1 Be7 27. Bb7 Kb8 28. Re4 Qc7 29. Rbe1 Bd6 30. dxc5 Bxc5 31. Qe2 1/2-1/2

[Event "Groningen Harmonie Mini op-B"]
[Site "Groningen"]
[Date "2002.12.28"]
[Round "3.1"]
[White "Seijen, Henk G"]
[Black "Potgieser, Edzard"]
[Result "0-1"]
[ECO "B12"]
[WhiteElo "1843"]
[BlackElo "1705"]
[PlyCount "62"]
[EventDate "2002.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3 e6 5. g4 Bg6 6. h4 h5 7. Bd3 Bxd3 8. cxd3 hxg4 9. Qxg4 Nh6 10. Bxh6 Rxh6 11. Nf3 Na6 12. 0-0-0 Qd7 13. Ng5 0-0-0 14. Rh3 f5 15. exf6 gxf6 16. Nf3 f5 17. Qg2 Bb4 18. Ne5 Qc7 19. f3 Kb8 20. Kb1 Rc8 21. f4 Ka8 22. Rc1 Qb6 23. Nf3 Rhh8 24. Rg3 c5 25. Na4 Qb5 26. Nxc5 Bxc5 27. dxc5 Qxd3+ 28. Ka1 Nxc5 29. Qf1 Qe3 30. Rc3 Qxf4 31. Qg1 Ne4 0-1

[Event "Groningen Harmonie Mini op-B"]
[Site "Groningen"]
[Date "2002.12.27"]
[Round "2.4"]
[White "Seijen, Henk G"]
[Black "Leuw, Ed"]
[Result "1-0"]
[ECO "C12"]
[WhiteElo "1843"]
[BlackElo "1721"]
[PlyCount "65"]
[EventDate "2002.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. Qg4 Kf8 9. h4 c5 10. Bd3 Nxd2 11. Kxd2 Nc6 12. Rh3 Rg8 13. Rg3 Ne7 14. dxc5 Qc7 15. Nf3 Qxc5 16. Nd4 Nf5 17. Rf3 Nxd4 18. cxd4 Qb4+ 19. Ke3 Qe7 20. Rh1 f5 21. exf6 gxf6 22. Qf4 f5 23. Qxh6+ Qg7 24. Qxg7+ Rxg7 25. g3 Ke7 26. h5 Bd7 27. h6 Rh7 28. g4 Kf6 29. gxf5 exf5 30. Rh5 Re8+ 31. Kd2 Kg6 32. Rhxf5 Bxf5 33. Bxf5+ 1-0

[Event "Groningen ABM op"]
[Site "Groningen"]
[Date "1999.??.??"]
[Round "?"]
[White "Seijen, Henk G"]
[Black "Algra, Jouke M"]
[Result "1-0"]
[ECO "B40"]
[PlyCount "60"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 c5 3. Nf3 cxd4 4. Nxd4 Bc5 5. Nc3 Qb6 6. Na4 Qa5+ 7. Nc3 Nf6 8. Nb3 Qb6 9. Nxc5 Qxc5 10. Bd3 0-0 11. 0-0 d5 12. exd5 exd5 13. Bg5 Bg4 14. Qd2 Nbd7 15. Rfe1 Rfe8 16. Be3 Qa5 17. f3 Bh5 18. Bd4 a6 19. Qf2 Qc7 20. Rxe8+ Rxe8 21. Re1 Ne5 22. Qg3 Nxf3+ 23. gxf3 Qxg3+ 24. hxg3 Rxe1+ 25. Kf2 Re6 26. Bf5 Rd6 27. Bc8 b5 28. Ke3 Bg6 29. Kd2 b4 30. Bxf6 gxf6 1-0

[Event "Groningen ABM op"]
[Site "Groningen"]
[Date "1999.??.??"]
[Round "?"]
[White "Seijen, Henk G"]
[Black "Wisman, Hans"]
[Result "1-0"]
[ECO "B26"]
[PlyCount "55"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Be3 Nd4 7. Qd2 Qa5 8. f4 Nf6 9. h3 Nh5 10. Bf2 Be6 11. Nf3 Rb8 12. Rc1 0-0 13. g4 Nxf3+ 14. Bxf3 Nf6 15. 0-0 b5 16. f5 Bc8 17. g5 Nd7 18. Qf4 b4 19. Ne2 Be5 20. Qh4 Bb7 21. Bg4 Qd8 22. Nf4 Bg7 23. Bg3 Ne5 24. Bf2 d5 25. f6 exf6 26. gxf6 Bh8 27. Bxc5 Rc8 28. Bxc8 1-0

[Event "Gasunie-open A"]
[Site "Groningen"]
[Date "1977.12.??"]
[Round "?"]
[White "Weide, Jan"]
[Black "Seijen, Henk G"]
[Result "1-0"]
[ECO "A26"]
[PlyCount "55"]
[EventDate "1977.12.26"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 0-0 5. Nf3 d6 6. 0-0 Nc6 7. d3 e5 8. Rb1 Bf5 9. b4 Qd7 10. b5 Nd8 11. Bg5 h6 12. Bxf6 Bxf6 13. Nd5 Bg7 14. Nh4 Be6 15. f4 c6 16. f5 gxf5 17. Ne3 f4 18. gxf4 f5 19. Kh1 Kh7 20. fxe5 dxe5 21. Nexf5 Bxf5 22. Nxf5 Ne6 23. bxc6 bxc6 24. e3 Rad8 25. Qg4 Rg8 26. Be4 Ng5 27. Ne7+ Nxe4 28. Qxe4+ 1-0

