[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.09.25"]
[Round "6"]
[White "Hellenberg, Jan Amerik"]
[Black "Van den Biggelaar, Don"]
[Result "1-0"]
[ECO "D08"]
[WhiteElo "2117"]
[BlackElo "1735"]
[PlyCount "39"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. a3 Nge7 6. b4 Ng6 7. Bb2 a5 8. b5 Ncxe5 9. Nxe5 Nxe5 10. e3 Be6 11. Bxd4 Nxc4 12. Qa4 Nb6 13. Qc2 a4 14. Nd2 Rc8 15. Bd3 Qd5 16. Be4 Qxb5 17. Bxb7 c5 18. Bxc8 Bxc8 19. Rb1 Qc6 20. Qe4+ 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.02.21"]
[Round "5"]
[White "Hubert, Michel1111"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "E18"]
[WhiteElo "1840"]
[BlackElo "2117"]
[PlyCount "59"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. Nf3 Bb7 4. g3 Nf6 5. Bg2 Be7 6. 0-0 0-0 7. Nc3 d5 8. Ne5 Nbd7 9. b3 c5 10. e3 Rc8 11. Bb2 Ba6 12. Re1 cxd4 13. exd4 Bb4 14. Rc1 Nb8 15. Bh3 Rc7 16. Nxf7 Rfxf7 17. Bxe6 dxc4 18. d5 Kf8 19. Bxf7 Rxf7 20. bxc4 Bxc4 21. Qa4 a5 22. Ba3 Bxa3 23. Qxa3+ Kg8 24. d6 Nc6 25. Qa4 b5 26. Nxb5 Bxb5 27. Qxb5 Nd4 28. Qd3 Qb6 29. Rc8+ Rf8 30. Qc4+ 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.01.24"]
[Round "4"]
[White "Hellenberg, Jan Amerik"]
[Black "Heijboer, Herman"]
[Result "1-0"]
[ECO "A85"]
[WhiteElo "2117"]
[BlackElo "1795"]
[PlyCount "109"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. c4 f5 2. Nf3 Nf6 3. Nc3 g6 4. d4 Bg7 5. b3 d6 6. Bb2 0-0 7. e3 c6 8. Bd3 a5 9. Qc2 Na6 10. a3 Nc7 11. 0-0 e6 12. Rfe1 d5 13. Ne5 Ng4 14. f4 Bxe5 15. dxe5 d4 16. Nd1 Nxe3 17. Nxe3 dxe3 18. Rxe3 Na6 19. c5 Nc7 20. Bc4 Nd5 21. Rd3 Qe7 22. Qf2 Bd7 23. Rad1 Rf7 24. Bc1 Rff8 25. Be3 Rfd8 26. Qe1 Be8 27. Qd2 Qc7 28. Bf2 Kg7 29. Bh4 Rd7 30. Qf2 Rb8 31. Bf6+ Kg8 32. h3 b5 33. cxb6 Qxb6 34. g4 Qxf2+ 35. Kxf2 Rdb7 36. gxf5 gxf5 37. Rg1+ Kf8 38. Rdg3 Bf7 39. Bg5 Ke8 40. Rc1 Rd7 41. Rd3 Kf8 42. Rd2 Kg7 43. Rd3 Rdb7 44. Ke2 h6 45. Bxd5 hxg5 46. Bc4 gxf4 47. Rg1+ Kf8 48. Kf3 Bh5+ 49. Kxf4 Bf7 50. Rd6 Rxb3 51. Bxb3 Rxb3 52. Rxc6 Rxa3 53. Rc8+ Be8 54. Rb1 Ra4+ 55. Kg5 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.12.20"]
[Round "3"]
[White "Van Briemen, Willem Jan"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D46"]
[WhiteElo "2005"]
[BlackElo "2117"]
[PlyCount "163"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 a6 7. a4 Bb4 8. 0-0 0-0 9. Qe2 Re8 10. e4 dxe4 11. Nxe4 Nxe4 12. Qxe4 Nf6 13. Qh4 Be7 14. Bg5 g6 15. Ne5 Nh5 16. Bxe7 Qxe7 17. Qxe7 Rxe7 18. c5 Nf6 19. b4 Bd7 20. Bc4 Rd8 21. Rfd1 Be8 22. Kf1 Kg7 23. f3 Nd5 24. Bxd5 exd5 25. Re1 f6 26. Nd3 Rxe1+ 27. Rxe1 Kf7 28. Kf2 Bd7 29. g4 g5 30. h4 h6 31. Rh1 Kg7 32. hxg5 hxg5 33. Re1 Kf7 34. Kg3 Rh8 35. Kg2 Rb8 36. Rh1 Kg7 37. Kg3 Re8 38. Re1 Rxe1 39. Nxe1 Be8 40. f4 gxf4+ 41. Kxf4 Bg6 42. Ng2 Bc2 43. a5 Be4 44. Ne3 Kg6 45. Nd1 Bc2 46. Nf2 Bb1 47. Nh3 Kf7 48. g5 fxg5+ 49. Kxg5 Ke7 50. Nf4 Bc2 51. Nh5 Bd3 52. Kh6 Bf5 53. Kg7 Bh3 54. Kg6 Bd7 55. Nf4 Be6 56. Kg7 Bf5 57. Nh5 Bg4 58. Nf6 Bf5 59. Ng8+ Kd8 60. Kf6 Bh3 61. Ke5 Kc7 62. Kf6 Bc8 63. Ke7 Bh3 64. Nf6 Bg2 65. Ne8+ Kc8 66. Nd6+ Kc7 67. Ne8+ Kc8 68. Kd6 Bf1 69. Nc7 Kb8 70. Kd7 Bh3+ 71. Kd6 Bf1 72. Ne6 Bc4 73. Nf8 Kc8 74. Ng6 Kb8 75. Ne5 Bb5 76. Kd7 Ba4 77. Kd8 Bd1 78. Nd7+ Ka7 79. Kc7 Bg4 80. Nf6 Bf5 81. Ne8 Bd3 82. Nd6 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.29"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Pijpers, Arthur"]
[Result "0-1"]
[ECO "A23"]
[WhiteElo "2117"]
[BlackElo "2480"]
[PlyCount "64"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. c4 e5 2. g3 Nf6 3. Bg2 c6 4. Nc3 d5 5. cxd5 cxd5 6. d4 e4 7. f3 Bb4 8. Bd2 Nc6 9. fxe4 dxe4 10. e3 Bxc3 11. Bxc3 Be6 12. Ne2 Bd5 13. Nf4 h5 14. Nxd5 Qxd5 15. Qb3 Ne7 16. Qxd5 Nexd5 17. Kd2 h4 18. gxh4 Rxh4 19. h3 Nh5 20. Rhf1 Ng3 21. Rf2 f5 22. Re1 Rc8 23. a3 Rh6 24. Bf1 Nxf1+ 25. Rfxf1 g6 26. Rg1 Kf7 27. Rg3 Rch8 28. Reg1 R8h7 29. R1g2 Rxh3 30. Rxg6 Rxe3 31. Rd6 Rd3+ 32. Kc2 Ne3+ 0-1

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.08"]
[Round "1"]
[White "Van der Scheer, Henk"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D02"]
[WhiteElo "1853"]
[BlackElo "2117"]
[PlyCount "66"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. g3 e6 4. Bg2 c5 5. e3 Nc6 6. 0-0 Be7 7. b3 0-0 8. Bb2 b6 9. Nbd2 Bb7 10. Re1 Rc8 11. c4 Nb4 12. Ne5 Nd7 13. Ndf3 dxc4 14. Nxc4 b5 15. Nce5 Nxe5 16. Nxe5 Bxg2 17. Kxg2 cxd4 18. Rc1 Rxc1 19. Qxc1 Qd5+ 20. Nf3 Nd3 21. e4 Qb7 22. Qd2 Nxe1+ 23. Qxe1 Bc5 24. Ne5 Rd8 25. Nd3 Bb6 26. f3 Qc7 27. Qf2 Rc8 28. b4 Qc2 29. Nc5 Qxf2+ 30. Kxf2 Bxc5 31. bxc5 Rxc5 32. Bxd4 Rc2+ 33. Ke3 Rxa2 0-1

[Event "Hilversum op"]
[Site "Hilversum"]
[Date "2019.06.21"]
[Round "1"]
[White "Hellenberg, Jan Amerik"]
[Black "Van de Griendt, Wouter"]
[Result "0-1"]
[ECO "A24"]
[WhiteElo "2018"]
[BlackElo "1868"]
[PlyCount "78"]
[EventDate "2019.06.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 191 Extra"]
[Source "ChessBase"]
[SourceDate "2019.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2019.09.30"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. d3 d6 6. Nf3 e5 7. 0-0 Nh5 8. e4 Qe8 9. Nh4 c6 10. Bf3 Nf6 11. Be3 Qe7 12. Qc1 Ng4 13. Bd2 Na6 14. Ng2 Nc5 15. Be2 f5 16. f3 Nf6 17. Bh6 Bd7 18. Bxg7 Qxg7 19. Qd2 Ne6 20. exf5 gxf5 21. f4 Nd4 22. Bf3 Rae8 23. Rae1 Qh6 24. Bd1 Kh8 25. Qf2 c5 26. Re3 Bc6 27. Rfe1 Ng4 28. Bxg4 fxg4 29. Nh4 exf4 30. Rxe8 Bxe8 31. Qg2 Bc6 32. Nd5 f3 33. Qf2 Bxd5 34. cxd5 Kg8 35. b4 b6 36. bxc5 bxc5 37. Kf1 Ne2 38. Rb1 Qd2 39. Qe1 Qxd3 0-1

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.05.24"]
[Round "8"]
[White "Termeulen, Albert"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "C00"]
[WhiteElo "2038"]
[BlackElo "2050"]
[PlyCount "34"]
[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. e4 e6 2. Nf3 d5 3. e5 c5 4. b4 c4 5. c3 a5 6. b5 Nd7 7. d3 cxd3 8. Bxd3 Qc7 9. 0-0 Nxe5 10. Nxe5 Qxe5 11. Na3 Bd6 12. g3 Qxc3 13. Rb1 Bxa3 14. Bf4 Nf6 15. Rb3 Qc5 16. Qf3 Qe7 17. Be5 Bd6 0-1

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.03.22"]
[Round "6"]
[White "Hellenberg, Jan Amerik"]
[Black "Van 't Hof, Eric"]
[Result "1/2-1/2"]
[ECO "A09"]
[WhiteElo "2050"]
[BlackElo "2059"]
[PlyCount "14"]
[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 e6 2. g3 d5 3. Bg2 Nf6 4. Nf3 d4 5. d3 c5 6. 0-0 Nc6 7. Nbd2 Bd6 1/2-1/2

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.02.15"]
[Round "5"]
[White "Van der Velden, Bram"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D60"]
[WhiteElo "2172"]
[BlackElo "2050"]
[PlyCount "87"]
[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. Nc3 e6 5. Bg5 Be7 6. e3 Nbd7 7. Bd3 0-0 8. 0-0 b6 9. Qe2 Bb7 10. Rfd1 Rc8 11. Rac1 Re8 12. h3 h6 13. Bf4 Nf8 14. Ne5 N6d7 15. Bb1 Nxe5 16. dxe5 Nd7 17. Qg4 Bg5 18. Bg3 f5 19. exf6 Nxf6 20. Qe2 Nh7 21. Bg6 Re7 22. h4 Bf6 23. Qg4 Nf8 24. Bb1 Rd7 25. b3 Qe7 26. Ne2 Rcd8 27. cxd5 Rxd5 28. Rxd5 exd5 29. Nd4 Bc8 30. Bf5 Bxd4 31. exd4 Bxf5 32. Qxf5 c5 33. Kh2 Qe6 34. Qd3 Rc8 35. dxc5 bxc5 36. Rd1 d4 37. Rd2 Re8 38. b4 cxb4 39. Qxd4 a5 40. Rc2 Re7 41. Qc5 b3 42. axb3 Qxb3 43. Rc3 Qe6 44. Re3 1-0

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.01.11"]
[Round "4"]
[White "Hellenberg, Jan Amerik"]
[Black "Van der Werf, Mark"]
[Result "1/2-1/2"]
[ECO "A29"]
[WhiteElo "2050"]
[BlackElo "2374"]
[PlyCount "65"]
[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. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. 0-0 Nb6 7. d3 Be7 8. a3 0-0 9. Nc3 Re8 10. b4 Bf8 11. Bb2 Bg4 12. Rc1 Nd4 13. e3 Nxf3+ 14. Bxf3 Bh3 15. Bxb7 Bxf1 16. Bxa8 Bxd3 17. Be4 Bc4 18. Qc2 h6 19. Na4 Bb5 20. Bc6 Bxc6 21. Qxc6 Re6 22. Qc2 Nxa4 23. Qxa4 Qb8 24. Rc6 Rxc6 25. Qxc6 Bd6 26. Qd5 c5 27. bxc5 Bxc5 28. Qxc5 Qxb2 29. Qxa7 Qb1+ 30. Kg2 Qe4+ 31. f3 Qc2+ 32. Kh3 Qf5+ 33. Kg2 1/2-1/2

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2018.12.07"]
[Round "3"]
[White "Groenendijk, Patrick"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D13"]
[WhiteElo "1715"]
[BlackElo "2050"]
[PlyCount "72"]
[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. cxd5 cxd5 5. Bf4 e6 6. e3 Bd6 7. Bg3 Nc6 8. Nf3 a6 9. Be2 0-0 10. 0-0 Bxg3 11. hxg3 Qd6 12. Rc1 Bd7 13. Na4 Nb4 14. a3 Bxa4 15. Qxa4 Nc6 16. Rfd1 b5 17. Qb3 Rfc8 18. Ne1 Na5 19. Qa2 Nc4 20. Nd3 Ne4 21. Bf3 Ncd2 22. Bxe4 Nxe4 23. Qb3 f6 24. Qb4 Qb6 25. Rxc8+ Rxc8 26. Rc1 Rxc1+ 27. Nxc1 Qc7 28. Nd3 Qc2 29. Qe7 h6 30. Qxe6+ Kh8 31. Qe8+ Kh7 32. Qe6 Qxd3 33. Qf5+ Kg8 34. Qc8+ Kf7 35. Qd7+ Kg6 36. Qg4+ Ng5 0-1

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2018.10.19"]
[Round "1"]
[White "Hellenberg, Jan Amerik"]
[Black "Schenkelaars, Vincent"]
[Result "1-0"]
[ECO "A35"]
[WhiteElo "2050"]
[BlackElo "1810"]
[PlyCount "105"]
[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. Nf3 c5 4. Nc3 cxd4 5. Nxd4 Nc6 6. e3 Nf6 7. Be2 0-0 8. 0-0 d6 9. b3 Qa5 10. Bd2 Qb6 11. Na4 Qc7 12. Rb1 Ne4 13. Nxc6 bxc6 14. Bf3 Nxd2 15. Qxd2 Rb8 16. Rfd1 Be6 17. e4 Rfd8 18. Qe2 Rd7 19. Rd3 Be5 20. g3 Qa5 21. Bg4 Bxg4 22. Qxg4 Rbd8 23. f4 Bg7 24. Rbd1 Qc7 25. e5 e6 26. exd6 Rxd6 27. Qf3 Rxd3 28. Rxd3 Rxd3 29. Qxd3 c5 30. Kg2 Qc6+ 31. Qf3 Qxf3+ 32. Kxf3 Bd4 33. g4 f5 34. gxf5 exf5 35. a3 Kf7 36. h3 Ke7 37. Ke2 Kd6 38. Kd3 Bf6 39. b4 Bd4 40. bxc5+ Bxc5 41. Nxc5 Kxc5 42. h4 Kc6 43. Kd4 Kd6 44. c5+ Kc6 45. a4 a6 46. a5 h6 47. Kc4 Kc7 48. Kd5 Kd7 49. c6+ Kc7 50. Kc5 g5 51. fxg5 hxg5 52. hxg5 f4 53. Kd4 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.30"]
[Round "7"]
[White "Roozendaal, Marc"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D36"]
[WhiteElo "1951"]
[BlackElo "2014"]
[PlyCount "70"]
[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. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Be7 6. Qc2 c6 7. e3 0-0 8. Bd3 h6 9. h4 Nbd7 10. Nf3 Ng4 11. 0-0-0 Nb6 12. Ne5 Nxe5 13. Bh7+ Kh8 14. dxe5 Nc4 15. Bf4 Qa5 16. Bd3 b5 17. e4 d4 18. Bxc4 dxc3 19. Bb3 cxb2+ 20. Kb1 c5 21. Bd5 Be6 22. Qxb2 Rab8 23. Bd2 Qb6 24. Be3 b4 25. f4 Qb5 26. f5 Bxd5 27. exd5 Rfc8 28. d6 Bd8 29. Rd5 Qc4 30. Qb3 Qe4+ 31. Qd3 Qg4 32. Rxc5 Rxc5 33. Bxc5 Rc8 34. Rc1 Qf4 35. d7 Rc7 0-1

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.23"]
[Round "6"]
[White "Hellenberg, Jan Amerik"]
[Black "Oei, Hway Ik"]
[Result "0-1"]
[ECO "A38"]
[WhiteElo "2014"]
[BlackElo "2011"]
[PlyCount "92"]
[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 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. a3 Nf6 6. Rb1 a5 7. Nf3 0-0 8. 0-0 d6 9. d3 h6 10. Bd2 Be6 11. Qc1 Kh7 12. Nd5 Ne8 13. Nf4 Bd7 14. e4 Nc7 15. Bc3 b5 16. Bxg7 Kxg7 17. Nd5 Ne6 18. Ne3 b4 19. axb4 axb4 20. b3 Ned4 21. Nxd4 Nxd4 22. Re1 Ra3 23. Nc2 Nxc2 24. Qxc2 e5 25. Qb2 Qa5 26. Re2 Ra8 27. Qc1 Ra1 28. Reb2 Qa3 29. Qc2 Rxb1+ 30. Rxb1 Qa2 31. Rb2 Qa1+ 32. Bf1 Bg4 33. Rb1 Qd4 34. Kg2 Ra3 35. h3 Bd7 36. Be2 Bc6 37. Qb2 f5 38. Qxd4 exd4 39. f3 Ra2 40. Kf2 fxe4 41. fxe4 Kf6 42. Kf3 Ke5 43. Kf2 Bxe4 44. dxe4 d3 45. Ke3 dxe2 46. Kd3 Rb2 0-1

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.16"]
[Round "5"]
[White "Heemskerk, Wim"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "A11"]
[WhiteElo "2168"]
[BlackElo "2014"]
[PlyCount "57"]
[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 c6 2. Nf3 d5 3. e3 Nf6 4. Nc3 Bg4 5. Qb3 Qb6 6. Ne5 Qxb3 7. axb3 e6 8. Nxg4 Nxg4 9. Be2 Nf6 10. 0-0 Nbd7 11. d4 Bd6 12. c5 Bc7 13. b4 0-0 14. b5 e5 15. b4 a6 16. bxc6 bxc6 17. Rxa6 Rxa6 18. Bxa6 Rb8 19. b5 cxb5 20. Nxb5 Ba5 21. c6 Ra8 22. Bb7 Rb8 23. Bb2 exd4 24. Bxd4 Bb6 25. Bxb6 Nxb6 26. Nc7 Ne8 27. Nxe8 Rxe8 28. c7 Kf8 29. Rb1 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.09"]
[Round "4"]
[White "Hellenberg, Jan Amerik"]
[Black "Oosterom, Erik"]
[Result "1/2-1/2"]
[ECO "D02"]
[WhiteElo "2014"]
[BlackElo "2005"]
[PlyCount "61"]
[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 c6 2. g3 d5 3. Bg2 Nf6 4. cxd5 cxd5 5. Nf3 Nc6 6. d4 e6 7. Nc3 a6 8. 0-0 Bd6 9. Bg5 Be7 10. e3 h6 11. Bxf6 Bxf6 12. Qd2 0-0 13. Rfc1 Be7 14. Rab1 Bd7 15. a3 Na5 16. Qd1 Rc8 17. Nd2 b5 18. b4 Nc4 19. Nxc4 Rxc4 20. Bf1 Rc6 21. Bd3 Qc7 22. Ne2 Rxc1 23. Rxc1 Qb6 24. Qb3 a5 25. Qc3 Rc8 26. bxa5 Qa6 27. Qd2 Bxa3 28. Rxc8+ Qxc8 29. Qc3 Qxc3 30. Nxc3 Bb4 31. Nxb5 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.06.02"]
[Round "3"]
[White "Van de Peut, Aart A"]
[Black "Hellenberg, Jan Amerik"]
[Result "1/2-1/2"]
[ECO "D36"]
[WhiteElo "1863"]
[BlackElo "2014"]
[PlyCount "93"]
[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. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Be7 6. e3 c6 7. Qc2 Nbd7 8. Nf3 h6 9. Bh4 Qa5 10. Bd3 a6 11. 0-0 Bd6 12. e4 dxe4 13. Nxe4 Nxe4 14. Bxe4 g5 15. Bg3 Bxg3 16. hxg3 Nf6 17. Bxc6+ Kf8 18. Be4 Kg7 19. Bd3 Be6 20. a3 Rac8 21. Qd1 Rhd8 22. Rc1 Rxc1 23. Qxc1 g4 24. Nh4 Rxd4 25. Qe3 Rd6 26. Be4 Qb6 27. Qc3 Rd4 28. Bf5 Rc4 29. Qd3 Rd4 30. Qe3 Rd6 31. Bxe6 fxe6 32. Qc3 Qd4 33. Rc1 Qxc3 34. Rxc3 Rc6 35. Rxc6 bxc6 36. Kf1 Ne4 37. Ke2 Nc5 38. Ke3 a5 39. Kd4 Na4 40. b4 axb4 41. axb4 Nb2 42. Kc5 Nd3+ 43. Kxc6 Nxb4+ 44. Kd6 Kf7 45. f3 Nd5 46. Ke5 Ne3 47. f4 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.05.26"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Bakker, Joop"]
[Result "1-0"]
[ECO "A10"]
[WhiteElo "2014"]
[BlackElo "1928"]
[PlyCount "97"]
[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 Nc6 2. g3 d5 3. cxd5 Qxd5 4. Nf3 Nf6 5. Nc3 Qh5 6. Bg2 Bh3 7. 0-0 0-0-0 8. d3 e5 9. Bg5 Be7 10. Qa4 h6 11. Bxf6 Bxf6 12. Rac1 Bxg2 13. Kxg2 a6 14. Ne4 Nd4 15. Qc4 Rd7 16. Nxd4 exd4 17. Rc2 Bd8 18. Rfc1 Qd5 19. Qa4 Be7 20. Kg1 h5 21. h4 f5 22. Nc5 Bxc5 23. Rxc5 Qf7 24. Qa5 Rf8 25. f4 Qe7 26. Re5 Qf7 27. Qc5 Kb8 28. Rc4 Rfd8 29. Rxf5 Qe6 30. Qe5 Qb6 31. b3 Rd5 32. Qe7 R5d7 33. Qc5 Qg6 34. Rg5 Qe6 35. Qe5 Qh3 36. Qf5 Qxf5 37. Rxf5 Re7 38. Re5 Rxe5 39. fxe5 Re8 40. Rxd4 Rxe5 41. Kf2 Kc8 42. Kf3 Ra5 43. a4 b5 44. Rd5 g6 45. Kf4 c6 46. Re5 Kd7 47. Kg5 Kd6 48. d4 Kc7 49. Kxg6 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2015.05.19"]
[Round "1"]
[White "Sikkel, Dirk"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "1905"]
[BlackElo "2014"]
[PlyCount "73"]
[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. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 Qb6 8. Nf3 cxd4 9. cxd4 f6 10. exf6 Nxf6 11. 0-0 Bd6 12. Nc3 0-0 13. Re1 Bd7 14. Be3 Rac8 15. a3 a6 16. Qc2 Qc7 17. Bg5 h6 18. Bh4 Nh5 19. Bg3 Nf4 20. Rad1 Nxg2 21. Kxg2 Bxg3 22. hxg3 Rxf3 23. Bh7+ Kh8 24. Kxf3 e5 25. dxe5 Nxe5+ 26. Kg2 d4 27. Rxd4 Qc6+ 28. Qe4 Qe6 29. Qxe5 Qh3+ 30. Kg1 Re8 31. Qxe8+ Bxe8 32. Rxe8+ Kxh7 33. Re7 b5 34. Rdd7 Kg6 35. Rxg7+ Kf6 36. Nd5+ Ke5 37. Nf4 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.24"]
[Round "7"]
[White "Senders, Justin"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "C02"]
[WhiteElo "1945"]
[BlackElo "1867"]
[PlyCount "50"]
[EventDate "2014.05.13"]
[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 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 f6 6. exf6 Nxf6 7. Bb5 Bd7 8. 0-0 Bd6 9. Re1 0-0 10. Bg5 Qb6 11. Bxc6 bxc6 12. b3 cxd4 13. cxd4 Ne4 14. Bh4 c5 15. Ne5 Qc7 16. Bg3 Nxg3 17. hxg3 cxd4 18. Nxd7 Qxd7 19. Qxd4 Rac8 20. Qd2 Bc5 21. Re2 Rxf2 22. Rxf2 Rf8 23. Qc2 Rxf2 24. Qxf2 Bxf2+ 25. Kxf2 Qf7+ 0-1

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.17"]
[Round "6"]
[White "Hellenberg, Jan Amerik"]
[Black "Oei, Hway Ik"]
[Result "0-1"]
[ECO "A36"]
[WhiteElo "1867"]
[BlackElo "2016"]
[PlyCount "75"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. a3 e5 6. Rb1 a5 7. Nb5 d6 8. d3 Nge7 9. e4 0-0 10. Ne2 Be6 11. 0-0 Qd7 12. Be3 h6 13. Qd2 Kh7 14. f4 b6 15. Rf2 f5 16. Rbf1 fxe4 17. Bxe4 d5 18. cxd5 Nxd5 19. Bxd5 Bxd5 20. Nec3 Rad8 21. Ne4 Nd4 22. Nbc3 exf4 23. Rxf4 Rxf4 24. Rxf4 Nf5 25. Kf1 Bxe4 26. dxe4 Qxd2 27. Bxd2 Rxd2 28. exf5 gxf5 29. Na4 b5 30. Nxc5 Bxb2 31. Nb3 Rxh2 32. Rxf5 a4 33. Na5 Bxa3 34. Rxb5 Rc2 35. Nb7 Bb2 36. Nc5 a3 37. Ra5 Kg6 38. Nd7 0-1

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.10"]
[Round "5"]
[White "Oosterom, Erik"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D15"]
[WhiteElo "2022"]
[BlackElo "1867"]
[PlyCount "57"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nc3 a6 5. a4 e6 6. g3 dxc4 7. Bg5 Be7 8. e4 Qa5 9. Bd2 Bb4 10. Bxc4 0-0 11. 0-0 Nbd7 12. e5 Nd5 13. Qc2 Nxc3 14. Bxc3 Bxc3 15. Ng5 g6 16. bxc3 Nb6 17. Bb3 Bd7 18. Ne4 Kg7 19. Qd2 Rfd8 20. Qf4 Be8 21. Rfc1 Nd7 22. h4 c5 23. h5 h6 24. hxg6 Qb6 25. gxf7 Bxf7 26. Nd6 Rf8 27. Qg4+ Kh8 28. Bxe6 Nf6 29. exf6 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.03"]
[Round "4"]
[White "Hellenberg, Jan Amerik"]
[Black "Schaeffner, Joost"]
[Result "0-1"]
[ECO "A10"]
[WhiteElo "1867"]
[BlackElo "1926"]
[PlyCount "54"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. c4 b6 2. Nc3 Bb7 3. e4 e6 4. g3 Bb4 5. Nge2 f5 6. Bg2 Nf6 7. 0-0 Nxe4 8. Nxe4 fxe4 9. Nf4 0-0 10. d3 Bc5 11. dxe4 Nc6 12. Rb1 a5 13. b3 e5 14. Nd3 Bd4 15. Bb2 Nb4 16. Bxd4 exd4 17. Nxb4 axb4 18. Qxd4 Rxa2 19. c5 bxc5 20. Qxc5 Ba6 21. Ra1 Rfxf2 22. Rxa2 Rxa2 23. Qd5+ Kh8 24. Rf7 d6 25. Qd4 Qg8 26. Rxc7 Qf8 27. Rd7 Rxg2+ 0-1

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.05.27"]
[Round "3"]
[White "Van Drunick, Jan Willem"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D15"]
[WhiteElo "1908"]
[BlackElo "1867"]
[PlyCount "64"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 5. e3 b5 6. b3 Bg4 7. Be2 e6 8. 0-0 Bb4 9. Bd2 Nbd7 10. Nxd5 Nxd5 11. cxd5 Bxd2 12. dxc6 Nb8 13. Qxd2 Nxc6 14. Rac1 Ne7 15. Rc5 0-0 16. Rfc1 Qd6 17. h3 Bf5 18. Ng5 h6 19. Nf3 Be4 20. Ne1 Rfd8 21. Bf3 Bxf3 22. Nxf3 Rac8 23. Qa5 f6 24. a4 bxa4 25. bxa4 Rb8 26. Nd2 Rdc8 27. Ne4 Rxc5 28. Qxc5 Qxc5 29. Nxc5 Rb6 30. a5 Rc6 31. Rb1 Nd5 32. Rb8+ Kf7 0-1

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.05.20"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A16"]
[WhiteElo "1867"]
[BlackElo "2016"]
[PlyCount "81"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. e3 e5 6. Nge2 c6 7. 0-0 d5 8. cxd5 cxd5 9. d4 exd4 10. Nxd4 Nc6 11. Nb3 Be6 12. Nc5 Qe7 13. Nxe6 fxe6 14. Bd2 Rad8 15. Ne2 Ne4 16. Bc3 Nxc3 17. Nxc3 Ne5 18. Rc1 Qb4 19. b3 Rc8 20. Ne2 Rxc1 21. Qxc1 Nd3 22. Qc2 Ne1 23. Qb1 Nxg2 24. Kxg2 e5 25. Qd3 d4 26. exd4 exd4 27. Rd1 Kh8 28. Nf4 Qe7 29. Rd2 Qf7 30. Qe4 Re8 31. Qd5 Qxd5+ 32. Nxd5 Kg8 33. Kf3 Kf7 34. Nf4 Re5 35. Rxd4 Re7 36. Rc4 Rd7 37. Ke2 Bd4 38. f3 Bg1 39. Nd3 Kf6 40. h4 Ke7 41. Re4+ 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.05.13"]
[Round "1"]
[White "Bloothoofd, Gerrie"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C18"]
[WhiteElo "2116"]
[BlackElo "1867"]
[PlyCount "101"]
[EventDate "2014.05.13"]
[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 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 Nbc6 10. f4 cxd4 11. Ne2 Bd7 12. h4 0-0-0 13. Qd3 dxc3 14. h5 Nf5 15. h6 Rg6 16. h7 Rh8 17. g3 Rg7 18. Bg2 Na5 19. Bf3 Qc4 20. g4 Qxd3 21. cxd3 Ne7 22. Nxc3 Rgxh7 23. Rxh7 Rxh7 24. Rb1 a6 25. Kf2 Nac6 26. Na4 Kc7 27. Nc5 Bc8 28. Be3 Ng6 29. Kg3 Nf8 30. Na4 Nd7 31. Nb6 Nxb6 32. Bxb6+ Kb8 33. d4 Bd7 34. Be2 Kc8 35. Bd3 Rh8 36. f5 exf5 37. gxf5 Ne7 38. e6 fxe6 39. f6 Nf5+ 40. Kf4 Nd6 41. Rc1+ Bc6 42. Kg5 Rg8+ 43. Kh6 Nf7+ 44. Kh7 Rg3 45. Bg6 Ng5+ 46. Kg7 Kd7 47. Rf1 Rxa3 48. f7 Nxf7 49. Rxf7+ Kc8 50. Rf8+ Kd7 51. Be8+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.07.02"]
[Round "7"]
[White "Van den Bosse, Bart"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D15"]
[BlackElo "1976"]
[PlyCount "70"]
[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 a6 5. h3 e6 6. c5 b6 7. cxb6 Qxb6 8. Na4 Bb4+ 9. Bd2 Qa5 10. a3 Bxd2+ 11. Nxd2 Nbd7 12. Qc2 Bb7 13. b4 Qd8 14. Nc5 Nxc5 15. bxc5 0-0 16. e3 Qc7 17. Nf3 a5 18. Rb1 Ba6 19. Bxa6 Rxa6 20. Qb3 a4 21. Qb7 Qa5+ 22. Rb4 Raa8 23. 0-0 Qa6 24. Ne5 Qe2 25. Rb2 Qh5 26. Qxc6 Ne4 27. Rb7 Rac8 28. Qxa4 Nxc5 29. dxc5 Qxe5 30. c6 Qc3 31. Qa6 Rxc6 32. Qa7 Rcc8 33. Rfb1 g6 34. Rb8 Rxb8 35. Rxb8 Qa1+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.25"]
[Round "6"]
[White "Roorda, Thijs"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D15"]
[WhiteElo "2079"]
[BlackElo "1976"]
[PlyCount "101"]
[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 a6 5. c5 Bf5 6. Bf4 Nbd7 7. h3 h6 8. e3 e6 9. Bd3 Bxd3 10. Qxd3 Be7 11. b4 0-0 12. g4 Nh7 13. 0-0-0 b6 14. h4 bxc5 15. bxc5 Nhf6 16. Rdg1 e5 17. Nxe5 Nxe5 18. Bxe5 Nd7 19. Bf4 Qa5 20. g5 h5 21. g6 f5 22. Kc2 Ra7 23. Rb1 Qd8 24. Qe2 Nf6 25. Rb6 Qc8 26. Bg5 Qe8 27. Rhb1 Ng4 28. Bf4 Qxg6 29. Nxd5 Bxh4 30. f3 Qe8 31. Rb8 Bd8 32. fxg4 Qe4+ 33. Kc1 Qxd5 34. gxh5 Ba5 35. h6 Rxb8 36. Rxb8+ Kh7 37. hxg7 Qh1+ 38. Qd1 Qxd1+ 39. Kxd1 Rxg7 40. Ra8 Rg2 41. Rxa6 Rxa2 42. Bc7 Ra1+ 43. Kc2 Bc3 44. Rxc6 Be1 45. Bf4 Kg7 46. d5 Kf7 47. Rc7+ Ke8 48. d6 Bh4 49. c6 Ra5 50. Rh7 Bf6 51. d7+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.18"]
[Round "5"]
[White "Hellenberg, Jan Amerik"]
[Black "Kubbenga, Michael"]
[Result "1/2-1/2"]
[ECO "A10"]
[WhiteElo "1976"]
[BlackElo "1955"]
[PlyCount "32"]
[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 b6 2. Nc3 Bb7 3. e4 e6 4. g3 f5 5. Bg2 Nf6 6. d3 fxe4 7. Nxe4 Nxe4 8. Bxe4 Bxe4 9. dxe4 Qf6 10. a3 Bc5 11. f4 Bxg1 12. Rxg1 Nc6 13. e5 Qf5 14. Be3 Qe4 15. Qe2 0-0-0 16. Bf2 Qxe2+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.11"]
[Round "4"]
[White "Hellenberg, Jan Amerik"]
[Black "De Ruyter, Wim"]
[Result "1-0"]
[ECO "A26"]
[WhiteElo "1976"]
[PlyCount "89"]
[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. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. e4 d6 6. Nge2 f5 7. d3 Nf6 8. 0-0 0-0 9. f3 Be6 10. Nd5 Qd7 11. Be3 fxe4 12. dxe4 Ne7 13. Qd2 c6 14. Nxf6+ Bxf6 15. b3 d5 16. cxd5 cxd5 17. exd5 Qxd5 18. Nc3 Qxd2 19. Bxd2 Rac8 20. Ne4 Nd5 21. Rac1 Be7 22. Bh6 Rfd8 23. Rfd1 b5 24. Bf1 a6 25. Bg5 Rxc1 26. Rxc1 Kf7 27. a4 bxa4 28. bxa4 a5 29. Bxe7 Kxe7 30. Rc5 Ne3 31. Kf2 Nd1+ 32. Ke1 Nb2 33. Rxe5 Rd5 34. Rxd5 Bxd5 35. Bb5 Nc4 36. Ke2 Nd6 37. Nxd6 Kxd6 38. f4 Bc6 39. Bxc6 Kxc6 40. g4 Kc5 41. Ke3 Kd5 42. h4 h6 43. Kd3 h5 44. g5 Kc6 45. f5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.04"]
[Round "3"]
[White "Fakkert, Erwin"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C01"]
[BlackElo "1976"]
[PlyCount "51"]
[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 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nc6 5. Be2 Bd6 6. Nc3 Nge7 7. Bg5 f6 8. Be3 Be6 9. a3 a6 10. Qd2 Qd7 11. Na4 b6 12. Nc3 Nf5 13. Bf4 Bxf4 14. Qxf4 g5 15. Qd2 g4 16. Ng1 Nfxd4 17. 0-0-0 Nxe2+ 18. Ngxe2 0-0-0 19. Nf4 d4 20. Qe2 Kb7 21. Nxe6 Rde8 22. Rhe1 Re7 23. Qxg4 Rhe8 24. Nc5+ bxc5 25. Qxd7 Rxe1 26. Nd5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.05.28"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Schenkelaars, Vincent"]
[Result "1/2-1/2"]
[ECO "A36"]
[WhiteElo "1976"]
[PlyCount "73"]
[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. g3 g6 3. Bg2 Bg7 4. Nc3 d6 5. d3 c5 6. e4 Nc6 7. Nge2 0-0 8. 0-0 Ne8 9. h3 Nc7 10. Be3 Ne6 11. Qd2 Ned4 12. f4 f5 13. Rad1 Rb8 14. Bf2 a6 15. Nxd4 Nxd4 16. Kh2 b5 17. b3 Bd7 18. Ne2 e5 19. Nxd4 exd4 20. Rfe1 Re8 21. Re2 Qf6 22. Rde1 b4 23. e5 dxe5 24. Bd5+ Kh8 25. Rxe5 Qd6 26. R5e2 Qf8 27. Qc1 Rxe2 28. Rxe2 Re8 29. Qe1 Rxe2 30. Qxe2 Qe8 31. Qxe8+ Bxe8 32. Be1 a5 33. Bd2 Bf6 34. Kg2 Kg7 35. Kf3 Bd7 36. Bc1 h5 37. h4 1/2-1/2

[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 "Van den Bosse, Bart"]
[Black "Hellenberg, Jan Amerik"]
[Result "1/2-1/2"]
[ECO "D13"]
[BlackElo "1595"]
[PlyCount "114"]
[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. d4 d5 2. Nf3 c6 3. c4 Nf6 4. Nc3 a6 5. cxd5 cxd5 6. Bf4 Nc6 7. Rc1 e6 8. e3 Bd6 9. Bxd6 Qxd6 10. Bd3 0-0 11. 0-0 Bd7 12. a3 Rac8 13. Qe2 Rfe8 14. h3 e5 15. dxe5 Nxe5 16. Nd4 Nc6 17. Qf3 Ne5 18. Qe2 Nc6 19. Qf3 Nxd4 20. exd4 Bc6 21. Rfd1 Rc7 22. Ne2 Rce7 23. Qg3 Qxg3 24. Nxg3 Ba4 25. Bc2 Bxc2 26. Rxc2 Re1+ 27. Rxe1 Rxe1+ 28. Kh2 g6 29. Ne2 Kg7 30. f3 Rd1 31. Kg3 Rd3 32. Kf2 h5 33. Rc7 Rb3 34. Rc2 g5 35. Nc1 Rb6 36. Nd3 h4 37. b4 Ne8 38. Rc5 Rd6 39. a4 f6 40. b5 axb5 41. Rxb5 b6 42. a5 bxa5 43. Rxa5 Kg6 44. Nb4 Nc7 45. Ke3 Rb6 46. Nxd5 Nxd5+ 47. Rxd5 Rb2 48. Rc5 Rxg2 49. Rc7 Kf5 50. Re7 Rg1 51. Ke2 Ra1 52. d5 Ra6 53. Ke3 Ra3+ 54. Kd4 Rxf3 55. d6 Rf1 56. d7 Rd1+ 57. Kc3 g4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.06.12"]
[Round "5"]
[White "Van 't Hof, Eric"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D15"]
[WhiteElo "2046"]
[BlackElo "1595"]
[PlyCount "79"]
[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. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 5. a4 e6 6. g3 dxc4 7. Bg2 c5 8. dxc5 Qxd1+ 9. Nxd1 Bxc5 10. Ne5 Bb4+ 11. Kf1 Nbd7 12. Nxc4 Nd5 13. e4 N5b6 14. Nde3 Bc5 15. a5 Nxc4 16. Nxc4 b5 17. e5 Rb8 18. Nd6+ Bxd6 19. exd6 Bb7 20. Be3 Bxg2+ 21. Kxg2 Nf6 22. Rhc1 Nd5 23. Ba7 Ra8 24. Bd4 f6 25. Bc5 Kd7 26. b4 Rac8 27. Re1 Rc6 28. f4 Rhc8 29. Rad1 Nc3 30. Rd3 Rxc5 31. bxc5 Na4 32. c6+ Kxc6 33. d7 Rd8 34. Rxe6+ Kc7 35. Rxa6 Kb7 36. Rad6 Nc5 37. Rb6+ Ka7 38. Rd5 Na4 39. Rc6 Kb7 40. Rc2 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.05.29"]
[Round "3"]
[White "Hellenberg, Jan Amerik"]
[Black "Kat, Rudolf"]
[Result "1-0"]
[ECO "A25"]
[WhiteElo "1595"]
[BlackElo "1920"]
[PlyCount "101"]
[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 e5 2. g3 Nf6 3. Bg2 Bc5 4. e3 Nc6 5. Nc3 a6 6. Nge2 h6 7. 0-0 0-0 8. d4 exd4 9. exd4 Ba7 10. h3 Rb8 11. a4 Re8 12. Be3 Ne7 13. Qd2 d6 14. g4 Ng6 15. Ng3 Nh7 16. Rae1 Be6 17. b3 Nh4 18. f4 Nxg2 19. Kxg2 f6 20. d5 Bxe3 21. Rxe3 Bf7 22. Rfe1 Qd7 23. Nf5 Rxe3 24. Rxe3 Re8 25. Ne4 b5 26. axb5 axb5 27. Nc3 bxc4 28. bxc4 Kf8 29. Qe2 Rxe3 30. Qxe3 h5 31. Kg3 hxg4 32. hxg4 g5 33. Qa7 gxf4+ 34. Kxf4 Ng5 35. Qd4 Qc8 36. Ne4 Nxe4 37. Qxe4 Qe8 38. Qxe8+ Kxe8 39. Ng7+ Ke7 40. Kf5 Bg8 41. Kf4 Bh7 42. Ne6 Bd3 43. Nxc7 Bxc4 44. Ke4 Kf7 45. Ne6 Kg6 46. Nd4 Kg5 47. Nf5 Kxg4 48. Ne3+ Kg5 49. Nxc4 f5+ 50. Kf3 Kf6 51. Kf4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2012.05.15"]
[Round "1"]
[White "Zuijdendorp, Milko"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D15"]
[BlackElo "1595"]
[PlyCount "64"]
[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. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 a6 5. cxd5 cxd5 6. Nf3 Nc6 7. Bd2 Bg4 8. Be2 e6 9. a3 Bd6 10. 0-0 0-0 11. Rc1 Rc8 12. Qc2 Na5 13. Qa4 Bxf3 14. Bxf3 Nc4 15. Qc2 b5 16. Be2 Qc7 17. g3 Nd7 18. Bd3 f5 19. Nxd5 exd5 20. Bxf5 h6 21. Be6+ Kh8 22. Bxd5 Ndb6 23. Bxc4 Nxc4 24. Bc3 Qf7 25. Qe2 Rce8 26. e4 Qf3 27. Qxf3 Rxf3 28. Kg2 Rxc3 29. Rxc3 Rxe4 30. Rxc4 bxc4 31. Kf3 Rxd4 32. Rc1 Be5 0-1

[Event "Leiden Noteboom Memorial-A 72nd"]
[Site "Leiden"]
[Date "2012.02.17"]
[Round "1"]
[White "Ypma, Peter"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C00"]
[WhiteElo "2100"]
[BlackElo "2019"]
[PlyCount "37"]
[EventDate "2012.02.17"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 147 Extra"]
[Source "ChessBase"]
[SourceDate "2012.04.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.04.24"]
[SourceQuality "1"]

1. e4 e6 2. Qe2 c5 3. b3 Nc6 4. Bb2 Nge7 5. g3 b6 6. Bg2 Bb7 7. f4 d5 8. d3 dxe4 9. dxe4 Qd7 10. Nf3 0-0-0 11. Nbd2 Nb4 12. 0-0-0 Ba6 13. Nc4 Bxc4 14. Qxc4 Qb7 15. Ng5 Nec6 16. a3 Na6 17. Nxf7 Rxd1+ 18. Rxd1 Qxf7 19. Qxa6+ 1-0

[Event "Leiden LCT op-A 5th"]
[Site "Leiden"]
[Date "2011.07.08"]
[Round "1"]
[White "Hellenberg, Jan Amerik"]
[Black "Van der Wiel, John"]
[Result "0-1"]
[ECO "A11"]
[WhiteElo "2024"]
[BlackElo "2451"]
[PlyCount "68"]
[EventDate "2011.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 c6 3. Bg2 d5 4. Nf3 dxc4 5. a4 Na6 6. Na3 Be6 7. Ng5 Bf5 8. Nxc4 h6 9. Nf3 e6 10. 0-0 Be7 11. d3 0-0 12. Bd2 Bh7 13. Ne1 Nd5 14. Nc2 Rc8 15. Rb1 c5 16. N4e3 Qd7 17. Nxd5 exd5 18. Ne3 Nc7 19. b3 b6 20. Bc1 Rfe8 21. Bb2 Bf8 22. Rc1 d4 23. Nc4 Nd5 24. Re1 Be7 25. Be4 Bg5 26. Ra1 Bxe4 27. dxe4 Rxe4 28. Bc1 Bf6 29. Qd3 Rce8 30. Bd2 Qe6 31. Kf1 Bg5 32. Bxg5 hxg5 33. f3 Qh3+ 34. Kg1 Rh4 0-1

[Event "Leiden Noteboom Memorial 71st"]
[Site "Leiden"]
[Date "2011.03.04"]
[Round "1"]
[White "Haslinger, Stewart"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2552"]
[BlackElo "2029"]
[PlyCount "95"]
[EventDate "2011.03.04"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 141 Extra"]
[Source "ChessBase"]
[SourceDate "2011.05.03"]
[SourceVersion "1"]
[SourceVersionDate "2011.05.03"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. c3 c5 6. Bd3 Nc6 7. Ne2 Qb6 8. Nf3 cxd4 9. cxd4 f6 10. exf6 Nxf6 11. 0-0 Bd6 12. b3 0-0 13. Bf4 Nxd4 14. Nfxd4 Bxf4 15. Nxf4 e5 16. Nxd5 Qxd4 17. Bc4 Be6 18. Ne7+ Kf7 19. Qxd4 exd4 20. Bxe6+ Kxe6 21. Rfe1+ Kf7 22. Nf5 Rad8 23. Rad1 d3 24. f3 Rd7 25. Re3 Rc8 26. Rexd3 Rxd3 27. Rxd3 Rc1+ 28. Kf2 Rc2+ 29. Kf1 Rxa2 30. Nd6+ Ke7 31. Nxb7 a5 32. Rd4 Nd7 33. h4 h6 34. Re4+ Kf6 35. Rd4 Ke7 36. g4 Ke6 37. Rd6+ Ke7 38. Rd5 a4 39. bxa4 Nb6 40. Re5+ Kf8 41. Nd6 Kg8 42. a5 Nd7 43. Re7 Nc5 44. Nf5 Rxa5 45. Rxg7+ Kh8 46. Rg6 Ra6 47. Rxa6 Nxa6 48. Nxh6 1-0

[Event "Leiden Noteboom Memorial 70th"]
[Site "Leiden"]
[Date "2010.02.13"]
[Round "3"]
[White "Hellenberg, Jan Amerik"]
[Black "Meijers, Viesturs"]
[Result "0-1"]
[ECO "A13"]
[WhiteElo "2067"]
[BlackElo "2470"]
[PlyCount "74"]
[EventDate "2010.02.12"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. c4 e6 2. g3 d5 3. Bg2 Nf6 4. Nf3 dxc4 5. Qa4+ Nbd7 6. Qxc4 a6 7. 0-0 b5 8. Qc2 Bb7 9. d3 Be7 10. Nc3 c5 11. b3 0-0 12. Bb2 h6 13. Rad1 Qb6 14. e3 Rac8 15. Qe2 Rfd8 16. Nd2 Bxg2 17. Kxg2 Ne5 18. Nde4 Qb7 19. f3 Nfd7 20. f4 Nc6 21. Qf3 f5 22. Nf2 Rc7 23. Ne2 Bf6 24. Bxf6 Nxf6 25. Rc1 Qb6 26. Rfd1 Nb4 27. a3 Nc6 28. Rc2 Na5 29. Nc1 Rcd7 30. h3 c4 31. b4 Nb3 32. Nxb3 cxb3 33. Rc6 Qa7 34. Rb1 Rxd3 35. Nxd3 Rxd3 36. Rc5 Ne4 37. Qe2 Rd2 0-1

[Event "Leiden LCT op 3rd"]
[Site "Leiden"]
[Date "2009.07.10"]
[Round "1"]
[White "Vovk, Andrey"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2506"]
[BlackElo "2074"]
[PlyCount "51"]
[EventDate "2009.07.10"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. c3 c5 6. Bd3 Nc6 7. Ne2 cxd4 8. cxd4 Qb6 9. Nf3 Bb4+ 10. Kf1 Be7 11. h4 f6 12. Nf4 Nf8 13. Nh5 Kf7 14. exf6 Bxf6 15. Nxf6 gxf6 16. h5 Bd7 17. Bh6 Ne7 18. Kg1 Bb5 19. Bc2 Rc8 20. Qd2 Qc6 21. Qf4 Nd7 22. Rc1 Qa6 23. Kh2 Ng8 24. Rhe1 Nxh6 25. Ng5+ Kf8 26. Nxe6+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.30"]
[Round "7"]
[White "Leeuwenburgh, Evert"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D53"]
[WhiteElo "2056"]
[BlackElo "2010"]
[PlyCount "118"]
[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 e6 2. c4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e3 c6 6. Rc1 a6 7. a3 dxc4 8. Bxc4 b5 9. Bd3 Bb7 10. Nf3 Nbd7 11. 0-0 0-0 12. b4 a5 13. Qb3 axb4 14. axb4 h6 15. Bxf6 Nxf6 16. Ne5 Qd6 17. Rb1 Ra6 18. Rfc1 Rfa8 19. Ne4 Nxe4 20. Bxe4 Ra3 21. Qd1 Bf6 22. Nd3 R8a7 23. Nc5 Bc8 24. Nd3 Bd7 25. Rc5 R7a6 26. Rbc1 Be8 27. g3 Bd7 28. Ne5 Bxe5 29. dxe5 Qxd1+ 30. Rxd1 Ra1 31. Bb1 Kf8 32. Rcc1 Ke7 33. Rd4 Be8 34. Kg2 R6a3 35. Rcd1 Rc3 36. Be4 Rxd1 37. Rxd1 c5 38. bxc5 Rxc5 39. f4 Bc6 40. Kf3 Bxe4+ 41. Kxe4 Rc4+ 42. Rd4 Rc5 43. Rd6 f5+ 44. Kd4 Rc2 45. Rb6 Rxh2 46. Rb7+ Kf8 47. Rxb5 Rd2+ 48. Kc3 Rd7 49. Rb4 Kf7 50. Rd4 Rc7+ 51. Kd2 g5 52. Ke2 g4 53. Rd2 h5 54. Kf2 Ke7 55. Kg2 Rd7 56. Ra2 Kf7 57. Rc2 Kg6 58. Ra2 h4 59. gxh4 Kh5 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.23"]
[Round "6"]
[White "Hellenberg, Jan Amerik"]
[Black "Oei, Hway Ik"]
[Result "0-1"]
[ECO "A36"]
[WhiteElo "2010"]
[BlackElo "2175"]
[PlyCount "114"]
[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 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. e4 d6 6. Nge2 c5 7. 0-0 Nc6 8. d3 Bd7 9. a3 Ne8 10. Rb1 a5 11. Bd2 Nc7 12. h3 Ne6 13. Kh2 Ned4 14. Nxd4 cxd4 15. Nb5 Qb6 16. a4 Ne5 17. Qe2 Bc6 18. f4 Nd7 19. b3 Nc5 20. f5 Nd7 21. Bg5 Rae8 22. Qd2 f6 23. Bh6 g5 24. Bxg7 Kxg7 25. Na3 Nc5 26. b4 axb4 27. Rxb4 Qa5 28. Rfb1 Bxa4 29. R1b2 Ra8 30. Bf1 Rfb8 31. Qf2 Bc6 32. Nc2 Na4 33. Ra2 Qc5 34. Qxd4 Kf7 35. Qxc5 Nxc5 36. Rxa8 Rxa8 37. Nd4 Ra3 38. Nxc6 bxc6 39. Rb6 Nxd3 40. Bxd3 Rxd3 41. Rxc6 Rd2+ 42. Kg1 Re2 43. Kf1 Rxe4 44. Kf2 h5 45. Kf3 Re5 46. g4 h4 47. Ra6 Re1 48. Kg2 Rc1 49. Ra4 Rc2+ 50. Kg1 Ke8 51. Ra8+ Kf7 52. Ra4 Rb2 53. Ra8 Rb7 54. Rc8 Ra7 55. Kg2 Ra5 56. Rb8 Rc5 57. Rb4 Rc7 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.16"]
[Round "5"]
[White "Hellenberg, Jan Amerik"]
[Black "Bakker, Joop"]
[Result "1-0"]
[ECO "A36"]
[WhiteElo "2010"]
[BlackElo "1854"]
[PlyCount "65"]
[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 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. a3 d6 6. Rb1 a5 7. d3 e5 8. e4 Nge7 9. Nge2 0-0 10. 0-0 Rb8 11. Bd2 Be6 12. Nb5 Nd4 13. Nexd4 cxd4 14. b4 axb4 15. Bxb4 Nc8 16. Qc1 f5 17. f3 fxe4 18. fxe4 Rxf1+ 19. Qxf1 Bh6 20. Bh3 Be3+ 21. Kh1 Qd7 22. Bxe6+ Qxe6 23. Qf3 Ne7 24. Rf1 Bh6 25. Nc7 Qd7 26. Qf7+ Kh8 27. Ne6 Rg8 28. Bd2 g5 29. Qf6+ Bg7 30. Nxg7 Rxg7 31. Bb4 Nc8 32. Rf5 Ne7 33. Rxg5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.09"]
[Round "4"]
[White "De Groot, Marco"]
[Black "Hellenberg, Jan Amerik"]
[Result "1/2-1/2"]
[ECO "C17"]
[WhiteElo "2082"]
[BlackElo "2010"]
[PlyCount "92"]
[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. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 Nc6 6. Nb5 Bxd2+ 7. Qxd2 Nxd4 8. Nxd4 cxd4 9. Nf3 Ne7 10. Bd3 Bd7 11. Nxd4 Nc6 12. Qe3 Qb6 13. c3 Nxd4 14. cxd4 Qb4+ 15. Ke2 Rc8 16. Rab1 Bb5 17. Rhc1 0-0 18. Bxb5 Qxb5+ 19. Qd3 Qb6 20. Rc3 Rc6 21. Kf1 Rfc8 22. h4 Rc4 23. g3 R8c6 24. Rb3 Qa6 25. Kg2 b5 26. a4 b4 27. Qd1 Qb6 28. Rd3 a5 29. b3 Rc2 30. Qg4 R6c3 31. Rbd1 Rxd3 32. Rxd3 Rc3 33. Qe2 h6 34. Qd2 Qc6 35. Re3 Rxe3 36. Qxe3 Qc3 37. Kf3 Qc2 38. Kg2 Qd1 39. Kh3 h5 40. Kg2 Kh7 41. Kh2 Qc2 42. Kg2 Qf5 43. Qf3 Kg6 44. Qe2 Qg4 45. Qd3+ Qf5 46. Qe2 Qg4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.02"]
[Round "3"]
[White "Van Ginkel, Henk"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "C02"]
[WhiteElo "1842"]
[BlackElo "2010"]
[PlyCount "44"]
[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. e4 e6 2. d4 d5 3. e5 c5 4. dxc5 Nc6 5. Bb5 Bxc5 6. Qg4 Nge7 7. Nf3 Qb6 8. Bxc6+ bxc6 9. Qxg7 Rg8 10. Qxh7 Bxf2+ 11. Kd1 Ba6 12. Nc3 Rxg2 13. Qh8+ Rg8 14. Qf6 Nf5 15. Bg5 Qxb2 16. Kd2 Be3+ 17. Bxe3 Rg2+ 18. Bf2 Rxf2+ 19. Ke1 Rxf3 20. Na4 Qb4+ 21. c3 Qe4+ 22. Kd2 Rf2+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.05.26"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Zeevaarder, Michael"]
[Result "0-1"]
[ECO "A22"]
[WhiteElo "2010"]
[BlackElo "1756"]
[PlyCount "48"]
[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. g3 Nf6 3. Bg2 d6 4. Nc3 c6 5. d3 Be7 6. Nf3 Bg4 7. h3 Bxf3 8. Bxf3 Na6 9. a3 Nc7 10. b4 Ne6 11. Bd2 h6 12. b5 Qd7 13. bxc6 bxc6 14. Qa4 Rc8 15. Rb1 0-0 16. 0-0 Nc5 17. Qc2 Qxh3 18. Be3 d5 19. Bxc5 Bxc5 20. cxd5 Qxg3+ 21. Kh1 Bxf2 22. Rxf2 Qxf2 23. Rg1 Qh4+ 24. Kg2 e4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.05.19"]
[Round "1"]
[White "Verheijen, Jan"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "D13"]
[WhiteElo "1655"]
[BlackElo "2010"]
[PlyCount "30"]
[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 c6 2. Nc3 Nf6 3. d4 d5 4. cxd5 cxd5 5. Nf3 Nc6 6. Bg5 Ne4 7. Nxe4 dxe4 8. Nd2 Qxd4 9. Qb3 e6 10. 0-0-0 Qc5+ 11. Kb1 Qxg5 12. Nxe4 Qg6 13. Qd3 Be7 14. e3 0-0 15. h4 Rd8 0-1

[Event "Leiden LCT op 2nd"]
[Site "Leiden"]
[Date "2008.07.11"]
[Round "1"]
[White "Van den Doel, Erik"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C18"]
[WhiteElo "2568"]
[BlackElo "2069"]
[PlyCount "109"]
[EventDate "2008.07.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. Bd3 cxd4 9. Ne2 dxc3 10. Qxg7 Rg8 11. Qxh7 Qxe5 12. Bf4 Qf6 13. h4 Nd7 14. Bg5 Qh8 15. Qxh8 Rxh8 16. Nxc3 f6 17. Bd2 Nc5 18. Be2 Bd7 19. Rb1 Bc6 20. Nb5 Kd7 21. Nd4 b6 22. g4 Rag8 23. f3 e5 24. Nxc6 Nxc6 25. Kf2 Nd4 26. Bd1 Nde6 27. a4 Nxa4 28. Ra1 b5 29. c4 dxc4 30. Bxa4 bxa4 31. Rxa4 Rc8 32. Rxa7+ Rc7 33. Ra3 Rb8 34. h5 Rb2 35. h6 Rxd2+ 36. Ke3 Rb2 37. h7 Nf4 38. Ke4 Ng6 39. Kf5 Nh8 40. Ra8 Rc8 41. Rxc8 Kxc8 42. Kxf6 Kd7 43. Kg7 Ke8 44. Rh5 Rb7+ 45. Kxh8 Kf7 46. Rg5 Kf6 47. Rg8 c3 48. g5+ Kf5 49. g6 c2 50. g7 Rxg7 51. Kxg7 c1Q 52. Rf8+ Ke6 53. Rf6+ Kd5 54. h8Q Qg5+ 55. Kf7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.07.01"]
[Round "7"]
[White "Jap Tjoen San, Linda"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "2139"]
[BlackElo "1953"]
[PlyCount "141"]
[EventDate "2008.05.20"]
[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 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3 c4 7. g3 Bd7 8. Nbd2 Na5 9. h4 g6 10. Bg2 h6 11. Rb1 Qc7 12. 0-0 Ne7 13. Re1 Nc8 14. Nh2 Nb6 15. Ng4 0-0-0 16. Qf3 Ba4 17. Ne3 h5 18. Qf6 Rh7 19. Nf3 Bg7 20. Qf4 Bh6 21. Ng5 Bxg5 22. Qxg5 Nb3 23. Bh3 Bd7 24. Ng2 Nxc1 25. Rexc1 Re8 26. Re1 Qd8 27. Qd2 Rg8 28. f4 Ba4 29. Re2 Qe7 30. Ne1 Rd8 31. Nf3 Rhh8 32. Rf1 Kb8 33. Qc1 Rc8 34. Qb1 Rc7 35. Ng5 Rg8 36. Qc1 Nd7 37. Qe3 Nf8 38. Qf3 Rh8 39. Qe3 Nh7 40. Nf3 Re8 41. Rfe1 Rc6 42. Qf2 Rb6 43. Qg2 Rh8 44. Nh2 Nf8 45. Nf1 Qd8 46. Ne3 Bc6 47. Qf2 Ba4 48. Kh2 Nd7 49. Rg1 Rc6 50. Bg2 Nb6 51. Bf3 Rc8 52. Ng2 Qe7 53. f5 exf5 54. Nf4 Bc6 55. e6 Rhe8 56. Rge1 Qf6 57. Re5 Rcd8 58. Qe3 fxe6 59. Rxe6 Rxe6 60. Qxe6 Qxe6 61. Rxe6 Be8 62. Re7 Nc8 63. Re5 Bf7 64. Nxd5 Bxd5 65. Bxd5 Nb6 66. Bf7 Rd6 67. Kg2 Rf6 68. Be8 f4 69. a4 fxg3 70. Kxg3 Nc8 71. Bd7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.24"]
[Round "6"]
[White "Hellenberg, Jan Amerik"]
[Black "Agaian, Jura"]
[Result "1-0"]
[ECO "A25"]
[WhiteElo "1953"]
[BlackElo "1840"]
[PlyCount "55"]
[EventDate "2008.05.20"]
[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. g3 e5 3. Bg2 Nc6 4. Nc3 d6 5. e3 Be7 6. Nge2 0-0 7. 0-0 Rb8 8. d4 exd4 9. exd4 Bf5 10. d5 Ne5 11. Nd4 Bg6 12. b3 Re8 13. f4 Ned7 14. h3 h6 15. Bb2 Bf8 16. Qd2 Ne4 17. Nxe4 Bxe4 18. Ne6 fxe6 19. Bxe4 c6 20. dxe6 Rxe6 21. Rae1 Nf6 22. Bh7+ Nxh7 23. Rxe6 Qc7 24. Rfe1 Rd8 25. Qd4 Rd7 26. Qxa7 d5 27. Re8 dxc4 28. Ba3 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.17"]
[Round "5"]
[White "Coene, Igor"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D30"]
[WhiteElo "2173"]
[BlackElo "1953"]
[PlyCount "111"]
[EventDate "2008.05.20"]
[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 e6 2. Nf3 d5 3. c4 c6 4. e3 Nf6 5. Nbd2 Be7 6. Bd3 Nbd7 7. 0-0 0-0 8. Re1 a6 9. Qc2 Re8 10. a3 Nf8 11. b4 Bd7 12. c5 a5 13. Bb2 axb4 14. axb4 Qc7 15. Ne5 Reb8 16. f4 Be8 17. g4 N6d7 18. Nef3 f6 19. Rac1 Bg6 20. f5 Bf7 21. Kh1 e5 22. dxe5 fxe5 23. Qc3 Qd8 24. e4 d4 25. Qc2 b5 26. Nb3 Bxb3 27. Qxb3+ Kh8 28. Ra1 h6 29. Rg1 Bf6 30. Rae1 Nh7 31. Bc1 Qg8 32. Qxg8+ Kxg8 33. h4 Kf7 34. g5 hxg5 35. hxg5 Rh8 36. g6+ Ke7 37. gxh7 Rxh7+ 38. Kg2 Ra4 39. Bd2 Ra3 40. Bc2 Ra2 41. Bb3 Ra3 42. Rb1 Nf8 43. Bc1 Ra7 44. Bb2 g6 45. Ra1 Rc7 46. Ra8 gxf5 47. exf5 Rh5 48. Bc2 Nh7 49. Rh1 Rxh1 50. Kxh1 Rd7 51. Be4 Rc7 52. Bxc6 Rxc6 53. Ra7+ Kf8 54. Rxh7 d3 55. Nxe5 Bxe5 56. Bxe5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.10"]
[Round "4"]
[White "Hellenberg, Jan Amerik"]
[Black "Wagemans, Ed"]
[Result "1-0"]
[ECO "A36"]
[WhiteElo "1953"]
[BlackElo "1955"]
[PlyCount "19"]
[EventDate "2008.05.20"]
[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. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. e4 d6 6. Nge2 c5 7. 0-0 Nc6 8. d3 a6 9. h3 b5 10. e5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.06.03"]
[Round "3"]
[White "Oudshoorn, Arres"]
[Black "Hellenberg, Jan Amerik"]
[Result "1/2-1/2"]
[ECO "C06"]
[WhiteElo "1815"]
[BlackElo "1953"]
[PlyCount "54"]
[EventDate "2008.05.20"]
[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 e6 2. f3 d5 3. g3 c5 4. Ne2 Nc6 5. c3 dxe4 6. fxe4 Qd3 7. Bg2 e5 8. h3 Nf6 9. 0-0 Be6 10. Rf3 Qd7 11. d3 Bxh3 12. Bxh3 Qxh3 13. Bg5 Ng4 14. Qb3 Qh2+ 15. Kf1 Qh1+ 16. Ng1 Nh2+ 17. Kf2 Nxf3 18. Qxb7 Qxg1+ 19. Kxf3 Qh1+ 20. Kf2 Qh2+ 21. Kf3 Qh5+ 22. Kg2 Qxg5 23. Qxc6+ Ke7 24. Qxa8 Qe3 25. Qb7+ Kf6 26. Na3 Qe2+ 27. Kg1 Qe3+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.05.27"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Wantola, Ivo"]
[Result "0-1"]
[ECO "A10"]
[WhiteElo "1953"]
[BlackElo "2237"]
[PlyCount "88"]
[EventDate "2008.05.20"]
[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. g3 Nf6 3. Bg2 c6 4. Nc3 d5 5. cxd5 cxd5 6. d4 e6 7. Nf3 Be7 8. 0-0 0-0 9. Ne5 b6 10. Re1 Bb7 11. e3 Nbd7 12. Nd3 Rc8 13. Bd2 a6 14. Nf4 Rc6 15. Qb3 g5 16. Nfxd5 exd5 17. Nxd5 Nxd5 18. Bxd5+ Kg7 19. Bxc6 Bxc6 20. Qc4 Nb8 21. Bc3 Bd5 22. Qe2 g4 23. Qd1 Qd7 24. Qd3 Qe6 25. Re2 Kg8 26. b3 b5 27. Rae1 Be4 28. Qd2 Qh6 29. f4 gxf3 30. Rf2 Rd8 31. Ref1 Nd7 32. Rxf3 Bxf3 33. Rxf3 Qh5 34. Qf2 Rf8 35. Qg2 Nf6 36. Rf1 Ne4 37. Be1 Bg5 38. Qf3 Qxf3 39. Rxf3 Rc8 40. Bb4 Rc1+ 41. Kg2 Rc2+ 42. Kf1 Rxh2 43. Kg1 Rxa2 44. Rxf5 Bxe3+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2008.05.20"]
[Round "1"]
[White "Bingen, Stanley"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "C00"]
[WhiteElo "1306"]
[BlackElo "1953"]
[PlyCount "116"]
[EventDate "2008.05.20"]
[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 e6 2. Bc4 d5 3. exd5 exd5 4. Bb3 Nf6 5. d4 Be7 6. Nc3 c6 7. Be3 Bf5 8. Nf3 Nbd7 9. 0-0 Bg4 10. Re1 0-0 11. Bf4 Nh5 12. Be5 Nxe5 13. Rxe5 Bd6 14. Re3 Bf4 15. Re1 Nf6 16. h3 Bh5 17. g4 Bg6 18. Ne2 Qc7 19. c4 Be4 20. Ne5 Bxe5 21. dxe5 Qxe5 22. Qd2 dxc4 23. Bxc4 Rfd8 24. Qc1 Bd5 25. Ng3 Qd4 26. Bb3 Ne4 27. Nxe4 Bxe4 28. Qf4 Qf6 29. Qxf6 gxf6 30. Rxe4 Rd2 31. Rb1 Kf8 32. Rf4 Kg7 33. h4 Re8 34. Bc4 h6 35. b4 Re5 36. a4 b6 37. Kg2 Rc2 38. h5 Rc3 39. Ra1 a5 40. b5 Rc5 41. Be2 Rc2 42. Bf3 cxb5 43. axb5 Rxb5 44. Be4 Rc4 45. f3 Rb2+ 46. Kg3 Rd4 47. Rb1 Rdb4 48. Rxb2 Rxb2 49. Bc6 Rc2 50. Ba4 Rb2 51. Rf5 Rb4 52. Rb5 Rxa4 53. Rxb6 Ra2 54. Kf4 a4 55. Kf5 Rf2 56. f4 a3 57. Rb1 a2 58. Ra1 Re2 0-1

[Event "Leiden LCT op 1st"]
[Site "Leiden"]
[Date "2007.07.15"]
[Round "3"]
[White "Slingerland, Fred"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "B15"]
[WhiteElo "2304"]
[BlackElo "2056"]
[PlyCount "107"]
[EventDate "2007.07.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 119 Extra"]
[Source "ChessBase"]
[SourceDate "2007.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2007.09.04"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. h3 d5 5. Nf3 dxe4 6. Nxe4 Nf6 7. Nxf6+ Bxf6 8. c3 0-0 9. Bc4 Nd7 10. 0-0 Nb6 11. Bb3 Nd5 12. Re1 Be6 13. Qe2 Nc7 14. Bc2 Qd7 15. Bg5 Bxg5 16. Nxg5 h6 17. Nxe6 Nxe6 18. Bb3 Ng7 19. Qxe7 Rad8 20. Qxd7 Rxd7 21. Re2 Re8 22. Rae1 Rxe2 23. Rxe2 Nh5 24. g3 Kf8 25. Kg2 Nf6 26. f4 Ne8 27. Kf3 Re7 28. Re5 f6 29. Rxe7 Kxe7 30. h4 Nd6 31. Bc2 f5 32. g4 Kf6 33. Bd3 b5 34. b3 a6 35. a3 Nb7 36. h5 gxh5 37. Bxf5 hxg4+ 38. Bxg4 Na5 39. b4 Nc4 40. Bd7 Nxa3 41. Ke4 Nc4 42. Bxc6 h5 43. Bd7 h4 44. Bh3 Nb6 45. Bg4 Na4 46. Kd3 Nb6 47. Ke4 Na4 48. d5 Nxc3+ 49. Kd4 Na4 50. d6 Nb2 51. Bc8 Nc4 52. Kc5 Nb2 53. Kb6 Nd3 54. d7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.26"]
[Round "7"]
[White "Bakker, Joop"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "1927"]
[BlackElo "1921"]
[PlyCount "56"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. f4 g6 2. Nf3 Bg7 3. g3 d5 4. Bg2 c6 5. 0-0 Nf6 6. c3 0-0 7. d3 Nbd7 8. Qc2 Qb6+ 9. Kh1 Ng4 10. e4 dxe4 11. dxe4 e5 12. Qb3 Nf2+ 13. Kg1 Nh3+ 14. Kh1 Nf2+ 15. Kg1 Nxe4+ 16. Qxb6 axb6 17. Nxe5 Nec5 18. Nxd7 Bxd7 19. Na3 Bf5 20. Be3 Rfe8 21. Bxc5 bxc5 22. Rfe1 Rxe1+ 23. Rxe1 Bxc3 24. Re2 Bd4+ 25. Kh1 Be6 26. Rc2 Bxa2 27. Nc4 Bxc4 28. Rxc4 Ra1+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.19"]
[Round "6"]
[White "Hellenberg, Jan Amerik"]
[Black "Blom, Vincent"]
[Result "1/2-1/2"]
[ECO "A17"]
[WhiteElo "1921"]
[BlackElo "1939"]
[PlyCount "49"]
[EventDate "2007.05.15"]
[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. g3 e6 3. Bg2 Nc6 4. Nc3 d5 5. d4 Bb4 6. a3 Bxc3+ 7. bxc3 Na5 8. cxd5 exd5 9. Bg5 c6 10. Nf3 0-0 11. Ne5 h6 12. Bxf6 Qxf6 13. 0-0 Qd8 14. e4 Be6 15. f4 dxe4 16. Bxe4 Nc4 17. f5 Bd5 18. Bxd5 Qxd5 19. Nxc4 Qxc4 20. Qd2 Rfe8 21. Rae1 f6 22. Rxe8+ Rxe8 23. Re1 Kf8 24. Rxe8+ Kxe8 25. Qe3+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.12"]
[Round "5"]
[White "Hellenberg, Jan Amerik"]
[Black "Oudshoorn, Arres"]
[Result "0-1"]
[ECO "A26"]
[WhiteElo "1921"]
[BlackElo "1767"]
[PlyCount "64"]
[EventDate "2007.05.15"]
[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. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. e4 e5 6. Nge2 d6 7. 0-0 Nc6 8. d3 Nd7 9. f4 f5 10. exf5 Rxf5 11. Be4 Rf8 12. Nd5 Nc5 13. Bg2 Bf5 14. Be3 Nxd3 15. g4 Nxb2 16. Qb3 exf4 17. gxf5 fxe3 18. f6 Rxf6 19. Qxb7 Rxf1+ 20. Rxf1 Nd4 21. Nxd4 Bxd4 22. Ne7+ Kh8 23. Qe4 c5 24. Kh1 d5 25. Qe6 Qb6 26. Qxd5 Rd8 27. Qg5 Re8 28. Nd5 Qd8 29. Qg4 e2 30. Re1 Nd3 31. Rxe2 Nf2+ 32. Rxf2 Bxf2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.05"]
[Round "4"]
[White "Lehmann, Stefan"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "C06"]
[WhiteElo "1595"]
[BlackElo "1921"]
[PlyCount "78"]
[EventDate "2007.05.15"]
[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 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 Qb6 8. Nf3 cxd4 9. cxd4 Bb4+ 10. Bd2 f6 11. exf6 Nxf6 12. 0-0 Bd6 13. Bc3 0-0 14. Ne5 Bxe5 15. dxe5 Ng4 16. Nd4 Ncxe5 17. Nf3 Nxf3+ 18. gxf3 Nf6 19. Kh1 Bd7 20. Bd4 Qd6 21. Qe2 Nh5 22. Rg1 Qf4 23. Bc3 d4 24. Bb4 Qxf3+ 25. Qxf3 Rxf3 26. Be4 Rf4 27. f3 Bc6 28. Bxc6 bxc6 29. Rae1 Kf7 30. Rc1 Rc8 31. Rg5 Nf6 32. Ra5 Nd5 33. Bd6 Rxf3 34. Rxa7+ Kf6 35. Kg2 Rf5 36. a4 d3 37. Kg3 d2 38. Rd1 Ne3 39. Be7+ Kg6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.29"]
[Round "3"]
[White "De Mooij, Marco"]
[Black "Hellenberg, Jan Amerik"]
[Result "1/2-1/2"]
[ECO "C10"]
[WhiteElo "1786"]
[BlackElo "1921"]
[PlyCount "101"]
[EventDate "2007.05.15"]
[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 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Bg5 Be7 6. Bxe7 Qxe7 7. Qd2 Ngf6 8. Nxf6+ Nxf6 9. Nf3 Ne4 10. Qc1 Bd7 11. Bd3 Nd6 12. 0-0 Bc6 13. Ne5 Be4 14. Bxe4 Nxe4 15. Re1 Nf6 16. Qe3 0-0 17. Nd3 Nd5 18. Qf3 Nb4 19. Nxb4 Qxb4 20. b3 c6 21. c3 Qd6 22. Re3 Rae8 23. Rae1 Re7 24. Qh5 g6 25. Qe5 Qxe5 26. Rxe5 Rd7 27. f3 Rfd8 28. Kf2 b6 29. R1e2 h5 30. g3 Rd5 31. f4 Kf8 32. Ke3 Ke7 33. Kf3 c5 34. Rxd5 Rxd5 35. dxc5 bxc5 36. Ke3 Rd1 37. Rd2 Re1+ 38. Kd3 Kd6 39. Kc4+ Kc6 40. b4 cxb4 41. cxb4 Re4+ 42. Kb3 h4 43. Rc2+ Kb6 44. a4 hxg3 45. hxg3 g5 46. a5+ Kb7 47. fxg5 Rg4 48. Rf2 Rxg3+ 49. Ka4 Rxg5 50. Rxf7+ Kb8 51. Re7 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.22"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "A25"]
[WhiteElo "1921"]
[BlackElo "2064"]
[PlyCount "54"]
[EventDate "2007.05.15"]
[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. g3 e5 3. Bg2 Nc6 4. Nc3 Bb4 5. Nd5 a5 6. a3 Bc5 7. e3 d6 8. Ne2 Bg4 9. Qb3 Nxd5 10. cxd5 a4 11. Qb5 Ra5 12. Qc4 Bxe2 13. Qxe2 Ne7 14. d3 Qd7 15. Bd2 Rb5 16. Bc3 Bb6 17. e4 0-0 18. f4 exf4 19. gxf4 Re8 20. Qh5 Nxd5 21. Bh3 Qe7 22. Bd2 Rxb2 23. Qxd5 Qh4+ 24. Kd1 Qxh3 25. Kc1 c6 26. Qc4 Rb5 27. Bb4 Be3+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.15"]
[Round "1"]
[White "Kriek, F."]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1393"]
[BlackElo "1921"]
[PlyCount "116"]
[EventDate "2007.05.15"]
[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 e6 2. d4 d5 3. exd5 exd5 4. Bd3 Nc6 5. c3 Bd6 6. Be3 Nge7 7. Bg5 h6 8. Bh4 Be6 9. Qc2 Qd7 10. Nd2 g5 11. Bg3 0-0-0 12. 0-0-0 f5 13. Bxd6 Qxd6 14. h3 Rdf8 15. Ne2 f4 16. f3 Nf5 17. Nf1 Nh4 18. Rg1 Ne7 19. Kb1 Bf5 20. Nc1 c5 21. dxc5 Qxc5 22. Nd2 Kb8 23. Ndb3 Qc8 24. Rge1 Bxd3 25. Nxd3 Nef5 26. Qf2 Ne3 27. Rc1 Qf5 28. Qe2 Nhxg2 29. Nd4 Qg6 30. Rg1 Re8 31. Nc2 Nxc2 32. Qxc2 Ne3 33. Qd2 Nc4 34. Qc2 Re3 35. Rcd1 Rhe8 36. Rge1 Qb6 37. Kc1 Rxe1 38. Rxe1 Rxe1+ 39. Nxe1 Qe3+ 40. Kd1 a6 41. a3 d4 42. cxd4 Qxd4+ 43. Kc1 Ne3 44. Qe2 Qc5+ 45. Kb1 Qf5+ 46. Ka1 Qxh3 47. Qd2 Qe6 48. Qd8+ Ka7 49. Qd4+ Qb6 50. Qc3 Nd5 51. Qd2 Qc5 52. Nd3 Qd4 53. Qc2 h5 54. Nf2 g4 55. fxg4 hxg4 56. Ne4 Ne3 57. Qc3 Qxc3 58. bxc3 g3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.27"]
[Round "7"]
[White "Hellenberg, Jan Amerik"]
[Black "De Mooij, Marco"]
[Result "1-0"]
[ECO "A26"]
[WhiteElo "1948"]
[BlackElo "1765"]
[PlyCount "91"]
[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 Nf6 2. g3 e5 3. Bg2 g6 4. Nc3 Bg7 5. e4 Nc6 6. Nge2 d6 7. d3 0-0 8. 0-0 Bg4 9. f3 Bd7 10. h3 Qc8 11. g4 Ne7 12. Be3 c6 13. Rc1 Ne8 14. Qd2 f5 15. Bg5 Nf6 16. d4 Qe8 17. Rcd1 Rd8 18. b3 Bc8 19. dxe5 dxe5 20. Qe3 b6 21. Qc1 f4 22. Qa3 Rd7 23. Nxf4 exf4 24. e5 Ned5 25. cxd5 Nxd5 26. Nxd5 cxd5 27. e6 Rc7 28. Qd6 Rc6 29. Qxd5 Qxe6 30. Qxe6+ Bxe6 31. Rfe1 h6 32. Be7 Re8 33. Bd6 g5 34. Bf1 Bd7 35. Bc4+ Kh8 36. Re7 Rxe7 37. Bxe7 Rxc4 38. bxc4 Be6 39. Rc1 Bd4+ 40. Kg2 Kg7 41. h4 Kf7 42. Bd8 Kg6 43. hxg5 hxg5 44. a4 a5 45. Rd1 Bc5 46. Bxb6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.20"]
[Round "6"]
[White "Van der Heijden, Jaap"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "A42"]
[WhiteElo "1727"]
[BlackElo "1948"]
[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. d4 g6 2. e4 Bg7 3. c4 d6 4. Nc3 Nd7 5. Be3 e5 6. d5 Ne7 7. Qd2 f5 8. Bh6 0-0 9. Bxg7 Kxg7 10. h4 Nf6 11. f3 fxe4 12. Nxe4 Nf5 13. Ne2 Nxe4 14. fxe4 Nxh4 15. 0-0-0 g5 16. g3 Nf3 17. Qe3 Bg4 18. Bh3 Qd7 19. Bg2 Rf6 20. Rdf1 Raf8 21. Bxf3 Bxf3 22. Qxg5+ Rg6 23. Qh4 Bxh1 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.13"]
[Round "5"]
[White "Hellenberg, Jan Amerik"]
[Black "Zwinkels, Wim"]
[Result "0-1"]
[ECO "A24"]
[WhiteElo "1948"]
[BlackElo "1910"]
[PlyCount "61"]
[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 g6 2. g3 Bg7 3. Bg2 d6 4. Nc3 e5 5. e4 Nf6 6. Nge2 0-0 7. d3 Be6 8. 0-0 c6 9. h3 d5 10. cxd5 cxd5 11. exd5 Nxd5 12. Nxd5 Bxd5 13. Bxd5 Qxd5 14. Nc3 Qd7 15. Kg2 Nc6 16. Be3 Rfd8 17. Qb3 b6 18. Rfd1 Nd4 19. Bxd4 Qxd4 20. Nb5 Qd7 21. Rac1 Rac8 22. f3 Rxc1 23. Rxc1 Qxd3 24. Qxd3 Rxd3 25. Rc2 a6 26. Nc7 a5 27. Kf2 e4 28. fxe4 Be5 29. Nd5 Rxg3 30. Nxb6 Rxh3 31. Kg2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.30"]
[Round "3"]
[White "Siero, Paul"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "B06"]
[WhiteElo "1187"]
[BlackElo "1948"]
[PlyCount "78"]
[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 g6 2. d4 Bg7 3. Nc3 d6 4. Bg5 Nd7 5. Qd2 a6 6. f4 c5 7. dxc5 Nxc5 8. 0-0-0 Qb6 9. Bd3 Nf6 10. Re1 Be6 11. f5 Bd7 12. Bh6 0-0 13. Bxg7 Kxg7 14. fxg6 fxg6 15. e5 dxe5 16. Rxe5 Qd6 17. Nf3 Nxd3+ 18. Qxd3 Bf5 19. Qxd6 exd6 20. Re7+ Rf7 21. Rxf7+ Kxf7 22. Re1 h6 23. h3 Re8 24. Rd1 Rd8 25. g4 Be4 26. Nxe4 Nxe4 27. Ne5+ Kf6 28. Rd5 Ke6 29. c4 Nf6 30. Rd3 Kxe5 31. c5 Rc8 32. b4 dxc5 33. Rc3 Nd5 34. Rxc5 Rxc5+ 35. bxc5 g5 36. Kc2 Nf4 37. Kc3 Nxh3 38. Kc4 Nf2 39. a4 Nxg4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.23"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Jap Tjoen San, Linda"]
[Result "0-1"]
[ECO "A34"]
[WhiteElo "1948"]
[BlackElo "2163"]
[PlyCount "92"]
[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 Nf6 2. g3 e6 3. Bg2 c5 4. Nf3 Be7 5. 0-0 0-0 6. Nc3 Nc6 7. e3 d5 8. cxd5 Nxd5 9. Nxd5 exd5 10. d4 c4 11. Ne5 Bf5 12. Nxc6 bxc6 13. Bd2 Qb6 14. Bc3 Bf6 15. Re1 Rfe8 16. Qd2 Rab8 17. f3 Bd3 18. Bf1 Bg6 19. Bg2 h5 20. Rad1 Bd3 21. Bf1 Bxf1 22. Kxf1 Qa6 23. e4 Qc8 24. e5 Be7 25. Kg2 Qf5 26. Qe2 Bg5 27. f4 Bh6 28. Rf1 Re6 29. Rf2 Rg6 30. Qc2 Qxc2 31. Rxc2 Bxf4 32. Rf2 Bg5 33. Rdf1 Rb7 34. Rf5 h4 35. g4 Bd8 36. h3 Re6 37. R1f2 g6 38. R5f3 Kg7 39. Bd2 f6 40. Bf4 c5 41. Re2 cxd4 42. exf6+ Kf7 43. Rd2 Rxf6 44. Rff2 d3 45. Be5 Rxf2+ 46. Kxf2 Ke6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.16"]
[Round "1"]
[White "Van Dijk, Rens"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "B50"]
[WhiteElo "1454"]
[BlackElo "1948"]
[PlyCount "54"]
[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 g6 2. d3 Bg7 3. Nf3 c5 4. Be2 Nc6 5. 0-0 d6 6. c3 Nf6 7. Nbd2 0-0 8. Nc4 b5 9. Ne3 Bb7 10. Rb1 a5 11. Bd2 e6 12. a3 b4 13. cxb4 axb4 14. a4 Ba6 15. b3 e5 16. Re1 Nh5 17. g3 Bc8 18. Nh4 Nf4 19. Neg2 Nxe2+ 20. Rxe2 Nd4 21. Re1 Be6 22. Be3 f5 23. exf5 Nxf5 24. Nxf5 Bxf5 25. Qd2 Qd7 26. Nh4 Be6 27. Nf3 Rxf3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.07.07"]
[Round "7"]
[White "Leeuwenburgh, Evert"]
[Black "Hellenberg, Jan Amerik"]
[Result "0-1"]
[ECO "C02"]
[WhiteElo "1987"]
[BlackElo "1926"]
[PlyCount "64"]
[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 e6 2. d4 d5 3. e5 c5 4. dxc5 Bxc5 5. Bd3 Qb6 6. Qe2 Nc6 7. c3 a5 8. Nf3 f6 9. 0-0 fxe5 10. Nxe5 Nxe5 11. Qxe5 Nf6 12. Nd2 0-0 13. Nf3 Ng4 14. Qh5 Bxf2+ 15. Kh1 Nf6 16. Qe5 Bc5 17. Bf4 Bd7 18. Bg3 Rae8 19. a4 Bc6 20. Ng5 d4 21. Rab1 h6 22. b4 axb4 23. cxb4 Bxb4 24. Nxe6 Bxg2+ 25. Kxg2 Rxe6 26. Qf5 Qc6+ 27. Kg1 Bd2 28. Bf2 Ne4 29. Bxe4 Rxe4 30. Qxf8+ Kxf8 31. Be3+ Kg8 32. Bxd2 Re2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.30"]
[Round "6"]
[White "Fructuoso, Vincent"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D45"]
[WhiteElo "2106"]
[BlackElo "1926"]
[PlyCount "63"]
[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 e6 2. c4 d5 3. Nf3 c6 4. e3 Nf6 5. Nc3 Nbd7 6. Qc2 Be7 7. Bd2 a6 8. g4 h6 9. Rg1 dxc4 10. g5 hxg5 11. Nxg5 Nf8 12. Nf3 g6 13. Bxc4 b5 14. Bd3 Bb7 15. Ne5 Bd6 16. Ne4 Bxe5 17. dxe5 Nxe4 18. Bxe4 Qc7 19. Bb4 c5 20. Rd1 Rc8 21. Bxb7 Qxb7 22. Bxc5 Qc7 23. b4 Nd7 24. Rd6 Nxe5 25. Qe4 Nc4 26. Rxe6+ fxe6 27. Qxe6+ Kd8 28. Qf6+ Kd7 29. Rxg6 Rce8 30. Rg7+ Kc8 31. Qxa6+ Kd8 32. Qa8+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "4"]
[White "Hellenberg, Jan Amerik"]
[Black "Geragousian, Biaina"]
[Result "1-0"]
[ECO "A10"]
[WhiteElo "1926"]
[BlackElo "2034"]
[PlyCount "35"]
[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 f5 2. g3 Nf6 3. Bg2 g6 4. Nc3 Bg7 5. d3 d6 6. e4 c6 7. Nge2 e5 8. 0-0 Be6 9. b3 d5 10. exd5 cxd5 11. Bg5 dxc4 12. Bxb7 Nbd7 13. Bxa8 Qxa8 14. dxc4 f4 15. Qd6 Kf7 16. Nd5 Re8 17. Bxf6 Nxf6 18. Nec3 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.02"]
[Round "3"]
[White "Coene, Igor"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "A26"]
[WhiteElo "2061"]
[BlackElo "1926"]
[PlyCount "69"]
[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 g6 2. g3 Bg7 3. Bg2 Nc6 4. Nc3 e5 5. d3 Nge7 6. e4 d6 7. Nge2 0-0 8. 0-0 Be6 9. Nd5 Qd7 10. Rb1 f5 11. f4 Nd8 12. b3 c6 13. Nxe7+ Qxe7 14. Ba3 c5 15. b4 Rc8 16. bxc5 dxc5 17. fxe5 fxe4 18. Rxf8+ Bxf8 19. Bxe4 Qg5 20. Nf4 b6 21. Nd5 Bg7 22. Bb2 Bxd5 23. Bxd5+ Kh8 24. Qf3 Qe7 25. Rf1 Ne6 26. Qg4 Re8 27. Kg2 Nd8 28. Qf4 Ne6 29. Qf7 Nd8 30. Qf2 Ne6 31. Re1 Rf8 32. Qe2 h6 33. Qg4 Ng5 34. h4 Ne6 35. Qxe6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.05.26"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Ruijgrok, Dennis"]
[Result "0-1"]
[ECO "A21"]
[WhiteElo "1926"]
[BlackElo "2171"]
[PlyCount "66"]
[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 g6 2. g3 Bg7 3. Bg2 d6 4. Nc3 e5 5. e4 Ne7 6. Nge2 Be6 7. d3 c6 8. 0-0 Qd7 9. Be3 Bh3 10. d4 Bxg2 11. Kxg2 f5 12. dxe5 dxe5 13. Qb3 Qc7 14. Rfd1 Nd7 15. c5 Rf8 16. f3 0-0-0 17. Qc4 Ng8 18. b4 Ndf6 19. b5 fxe4 20. Nxe4 Rxd1 21. Rxd1 Nxe4 22. Qxe4 cxb5 23. c6 bxc6 24. Rc1 Kb7 25. Nc3 Nf6 26. Qb4 a6 27. a4 c5 28. Bxc5 Bh6 29. Bxf8 Bxc1 30. axb5 a5 31. Qb3 Bd2 32. Nd5 Qf7 33. Nxf6 Qxb3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.05.19"]
[Round "1"]
[White "Hellenberg, Jan Amerik"]
[Black "Stork, Ornett J"]
[Result "1-0"]
[ECO "A34"]
[WhiteElo "1926"]
[BlackElo "2120"]
[PlyCount "87"]
[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. g3 c5 3. Bg2 d5 4. cxd5 Nxd5 5. Nc3 Nc7 6. Nf3 Nc6 7. 0-0 e5 8. Ne1 Be6 9. Nd3 f6 10. b3 Qd7 11. f4 Bh3 12. fxe5 Bxg2 13. Kxg2 fxe5 14. Nf2 0-0-0 15. d3 Be7 16. Be3 g5 17. Qd2 Rdg8 18. Nfe4 Ne6 19. Rf7 Nf4+ 20. Bxf4 gxf4 21. Nf6 Qe6 22. Nxg8 Qxf7 23. Nxe7+ Nxe7 24. Ne4 Nf5 25. Rc1 Kb8 26. Qc3 Ne3+ 27. Kg1 Qe6 28. Qxc5 Nd5 29. Qd6+ Qxd6 30. Nxd6 fxg3 31. hxg3 Rg8 32. Ne4 b6 33. Kg2 Nf4+ 34. Kf3 Ne6 35. e3 Kb7 36. Rh1 Rg7 37. Rh5 Nd8 38. Rxe5 Nc6 39. Nd6+ Ka6 40. Re4 Rd7 41. Ra4+ Na5 42. Nc4 Rxd3 43. Nxa5 bxa5 44. b4 1-0

[Event "Leiden op"]
[Site "Leiden"]
[Date "1992.02.29"]
[Round "2"]
[White "Schmittdiel, Eckhard"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "C17"]
[WhiteElo "2485"]
[BlackElo "1889"]
[PlyCount "85"]
[EventDate "1992.02.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 Bxc3 6. Bxc3 Nc6 7. Nf3 b6 8. Bb5 Bd7 9. a4 Nge7 10. 0-0 h6 11. Qd2 a6 12. Be2 Qc7 13. a5 cxd4 14. Nxd4 b5 15. f4 Qa7 16. Rad1 Nf5 17. g4 Nfxd4 18. Bxd4 Nxd4 19. Qxd4 Qxd4+ 20. Rxd4 g6 21. Kf2 Ke7 22. Ke3 Rac8 23. Kd2 f5 24. gxf5 gxf5 25. Rg1 Rhg8 26. Rg3 Rxg3 27. hxg3 Rg8 28. Rd3 Rc8 29. Rc3 Kd8 30. Rxc8+ Kxc8 31. Kc3 Kc7 32. Kd4 Kc6 33. c3 Be8 34. b3 Bd7 35. Bf3 Kc7 36. Kc5 Bc6 37. Be2 Bd7 38. c4 dxc4 39. bxc4 bxc4 40. Bxc4 Bc8 41. Bf1 Bb7 42. Be2 Bc8 43. Bc4 1-0

