[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2021.07.09"]
[Round "7"]
[White "Helfferich, Gert"]
[Black "Uittenbogaard, Rob"]
[Result "1-0"]
[ECO "B50"]
[WhiteElo "1097"]
[BlackElo "1563"]
[PlyCount "65"]
[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. e4 c5 2. Nf3 d6 3. Bc4 e6 4. d3 Nc6 5. 0-0 Be7 6. c3 a6 7. a4 Bd7 8. Ne1 Qc7 9. Nd2 Ne5 10. Ba2 Nf6 11. f4 Neg4 12. Rf3 h5 13. Rg3 h4 14. Rxg4 Nxg4 15. Qxg4 0-0-0 16. Qxg7 d5 17. e5 Rdf8 18. Qg4 d4 19. Ne4 Bc6 20. cxd4 Rfg8 21. Qf3 Bxe4 22. dxe4 cxd4 23. Bd2 Kb8 24. Rc1 Qb6 25. Nd3 Qd8 26. b4 Rg3 27. hxg3 hxg3 28. Qxg3 Bh4 29. Qf3 Rg8 30. Be1 Bxe1 31. Rxe1 Rh8 32. Nf2 Ka7 33. Rd1 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.01.24"]
[Round "4"]
[White "Bingen, Stanley"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "1168"]
[BlackElo "1097"]
[PlyCount "75"]
[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. e4 e5 2. Bc4 Nf6 3. Nc3 c6 4. Nf3 d6 5. Ng5 d5 6. exd5 cxd5 7. Bb3 h6 8. Nf3 Nc6 9. 0-0 Bg4 10. d3 Nd4 11. Ba4+ Nc6 12. Re1 Bd6 13. h3 Bd7 14. Nb5 Bb8 15. c3 0-0 16. Be3 a6 17. Na3 b5 18. Bc2 e4 19. dxe4 dxe4 20. Nd2 Qc7 21. Nf1 Rd8 22. Qe2 b4 23. Nc4 Ba7 24. Ng3 bxc3 25. bxc3 Qc8 26. Nxe4 Nxe4 27. Bxe4 Bxe3 28. Nxe3 Re8 29. Qc2 Re6 30. Nd5 Rb8 31. a4 g6 32. a5 f5 33. Bf3 Rxe1+ 34. Rxe1 Nxa5 35. Ne7+ Kf8 36. Nxc8 Rxc8 37. Qd2 Nc4 38. Qxd7 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.12.20"]
[Round "3"]
[White "Helfferich, Gert"]
[Black "Molsbergen, Chris"]
[Result "0-1"]
[ECO "C55"]
[WhiteElo "1097"]
[BlackElo "1427"]
[PlyCount "72"]
[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. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Be7 5. c3 0-0 6. 0-0 a6 7. Re1 b5 8. Bb3 h6 9. Bxh6 gxh6 10. Nh4 d6 11. h3 Kh7 12. Qf3 Rg8 13. Bxf7 Rg7 14. Bb3 Bd7 15. Bd5 Nxd5 16. Nf5 Nf4 17. Nxg7 Qg8 18. Nf5 Rf8 19. d4 Bd8 20. dxe5 dxe5 21. Rd1 Bxf5 22. exf5 Ne7 23. f6 Rxf6 24. Nd2 Nf5 25. Ne4 Rg6 26. Rd7+ Kh8 27. Ng3 Nxg3 28. fxg3 Nxh3+ 29. Kh2 Ng5 30. Qd3 Rd6 31. Qf5 Rxd7 32. Qxd7 Ne4 33. Qh3 Qg5 34. Rf1 Nf6 35. Rf5 Ng4+ 36. Kg1 Qxf5 0-1

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.29"]
[Round "2"]
[White "Vleming, Stefan"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "D38"]
[WhiteElo "1774"]
[BlackElo "1097"]
[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. d4 d5 2. c4 e6 3. Nc3 Bb4 4. Nf3 Nf6 5. e3 Bxc3+ 6. bxc3 0-0 7. Bd3 c6 8. 0-0 Ne4 9. Qc2 f5 10. Ba3 Re8 11. Nd2 Nf6 12. cxd5 cxd5 13. Rab1 a6 14. c4 Nbd7 15. c5 Nf8 16. Rb6 Ne4 17. Bxe4 fxe4 18. f3 Qg5 19. Qb3 Nd7 20. Rd6 Nf6 21. fxe4 dxe4 22. Rf4 Kh8 23. Nc4 Qh5 24. Ne5 Qe2 25. h3 Qe1+ 26. Kh2 Nh5 27. Rg4 Rf8 28. Rd8 Kg8 29. Rxf8+ Kxf8 30. c6+ Kg8 31. cxb7 Bxb7 32. Qxe6+ Kh8 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.08"]
[Round "1"]
[White "Helfferich, Gert"]
[Black "Van Vleuten, Ronald"]
[Result "0-1"]
[ECO "B01"]
[WhiteElo "1097"]
[BlackElo "1622"]
[PlyCount "68"]
[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. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6 4. d4 Nf6 5. Nf3 c6 6. Bc4 Bg4 7. h3 Bh5 8. g4 Bg6 9. Ng5 h6 10. Nf3 Nbd7 11. Be3 e6 12. Qd2 Ne4 13. Nxe4 Bxe4 14. Be2 Be7 15. Bf4 Qb4 16. Qxb4 Bxb4+ 17. c3 Be7 18. Rg1 Nf6 19. Nd2 Bh7 20. g5 hxg5 21. Rxg5 Nd5 22. Rxd5 exd5 23. Be5 f6 24. Bh2 Bf5 25. Bh5+ Rxh5 26. Ke2 Rxh3 27. Bg3 Bg4+ 28. Ke3 f5 29. Re1 Bd6 30. Kd3+ Kd7 31. Rg1 f4 32. f3 Bf5+ 33. Ke2 fxg3 34. Nf1 Bf4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.29"]
[Round "7"]
[White "Bon, Peter"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "1585"]
[BlackElo "1120"]
[PlyCount "35"]
[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 Nf6 2. Nc3 e5 3. Nf3 Bc5 4. Nxe5 Bd4 5. Nf3 Bxc3 6. bxc3 Nxe4 7. Bd3 d5 8. Ba3 Bg4 9. h3 Bf5 10. Qe2 Qf6 11. Nd4 Nc6 12. Nxc6 Qxc6 13. Bb5 Qxb5 14. Qxb5+ Bd7 15. Qxb7 Rd8 16. Qxd5 Nf6 17. Qc5 Ng8 18. Qf8# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.15"]
[Round "5"]
[White "Helfferich, Gert"]
[Black "Kuiper, Cor"]
[Result "0-1"]
[ECO "C11"]
[WhiteElo "1120"]
[BlackElo "1137"]
[PlyCount "100"]
[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 Nf6 2. Nc3 e6 3. e4 d5 4. e5 Nfd7 5. Nf3 c6 6. g3 f6 7. Bh3 Qe7 8. Bf4 a6 9. Qe2 Nb6 10. exf6 gxf6 11. 0-0-0 Bg7 12. Rhe1 Kf7 13. Rd3 Re8 14. Re3 Nc4 15. Bxe6+ Bxe6 16. Rxe6 Qxe6 17. Qxe6+ Rxe6 18. Rxe6 Kxe6 19. Na4 Nd7 20. b3 Nd6 21. Bxd6 Kxd6 22. c4 b5 23. c5+ Kc7 24. Nc3 Re8 25. Nh4 Bf8 26. Kd2 a5 27. Nf5 Nb8 28. g4 Na6 29. a3 b4 30. axb4 axb4 31. Na4 Re4 32. f3 Re6 33. Nb6 Nb8 34. Na4 Re8 35. Nb2 Na6 36. Nd3 Ra8 37. Nf4 Kd7 38. Nh5 Ke6 39. Nf4+ Kf7 40. Nd3 Rb8 41. Nb2 Nc7 42. Na4 Ne6 43. Nb6 Rb7 44. Ne3 Nxd4 45. Nc2 Nxc2 46. Kxc2 Bxc5 47. Na4 Bd6 48. Nb2 Bxh2 49. Nd3 Bd6 50. Ne1 Re7 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.08"]
[Round "4"]
[White "Kettenis, John"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "A48"]
[WhiteElo "1537"]
[BlackElo "1120"]
[PlyCount "63"]
[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 g6 2. Nf3 Bg7 3. e3 Nf6 4. Bd3 0-0 5. b3 Re8 6. Bb2 d5 7. Nbd2 Nc6 8. a3 Bg4 9. h3 Bxf3 10. Nxf3 Nd7 11. Bb5 e5 12. Bxc6 bxc6 13. dxe5 Nxe5 14. Nxe5 Bxe5 15. Bxe5 Rxe5 16. Qd4 Re4 17. Qd3 Qf6 18. 0-0 Rae8 19. Qa6 R8e5 20. Qxa7 Qh4 21. Qxc7 Rg5 22. Qh2 Rh5 23. a4 g5 24. Qg3 Rg4 25. Qxh4 Rgxh4 26. f3 f5 27. a5 g4 28. fxg4 fxg4 29. Rf4 gxh3 30. Rxh4 Rxh4 31. Ra4 h2+ 32. Kh1 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.02"]
[Round "3"]
[White "Helfferich, Gert"]
[Black "Verheijen, Jan"]
[Result "0-1"]
[ECO "B44"]
[WhiteElo "1108"]
[BlackElo "1655"]
[PlyCount "42"]
[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 c5 2. Nf3 e6 3. c4 Nc6 4. d4 cxd4 5. Nxd4 Qb6 6. Nxc6 bxc6 7. Qe2 Ba6 8. Nd2 g6 9. g3 Bg7 10. e5 Ne7 11. Rb1 Nf5 12. b4 0-0 13. b5 cxb5 14. cxb5 Bb7 15. Nf3 Qa5+ 16. Qd2 Qxd2+ 17. Nxd2 Bxh1 18. a4 Bxe5 19. f4 Bc7 20. Nb3 Rfc8 21. Nc5 Ba5+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.19"]
[Round "6"]
[White "Loomans, Nico"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "1507"]
[BlackElo "1012"]
[PlyCount "59"]
[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. d4 d5 2. Nf3 h6 3. c4 e6 4. cxd5 exd5 5. e3 Bg4 6. Be2 f6 7. Qb3 b6 8. Nc3 Ne7 9. h3 Bf5 10. Nd2 Nbc6 11. Bf3 Na5 12. Qd1 c6 13. 0-0 g6 14. Re1 h5 15. e4 Bd7 16. exd5 Qc7 17. Nde4 Ng8 18. Nxf6+ Kd8 19. Nxd7 Qxd7 20. Bg5+ Be7 21. Bxe7+ Nxe7 22. dxc6 Naxc6 23. d5 Na5 24. b4 Nc4 25. d6 Nb2 26. dxe7+ Ke8 27. Qxd7+ Kxd7 28. Bxa8 Rxa8 29. Re4 Ke8 30. Nd5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.12"]
[Round "5"]
[White "Helfferich, Gert"]
[Black "Van den Bosse, Bart"]
[Result "0-1"]
[ECO "D02"]
[WhiteElo "1012"]
[BlackElo "1727"]
[PlyCount "48"]
[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. d4 d5 2. Nf3 Nf6 3. Ne5 Bf5 4. Bg5 Ne4 5. Be3 e6 6. c3 Nd7 7. Qb3 Nxe5 8. dxe5 b6 9. Qa4+ Qd7 10. Qxd7+ Kxd7 11. f3 Nc5 12. Nd2 Na6 13. 0-0-0 c5 14. Nb3 Be7 15. g4 Bg6 16. f4 c4 17. Nd4 Be4 18. Rg1 Bc5 19. Bh3 b5 20. f5 b4 21. Nb3 Bxe3+ 22. Nd2 bxc3 23. fxe6+ fxe6 24. bxc3 Rab8 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.05"]
[Round "4"]
[White "Van der Hoeven, Peter"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "D53"]
[WhiteElo "1647"]
[BlackElo "1012"]
[PlyCount "83"]
[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. d4 d5 2. c4 Nf6 3. Nf3 Nc6 4. Nc3 e6 5. Bg5 Be7 6. Rc1 0-0 7. e3 a5 8. a3 dxc4 9. Bxc4 b6 10. Qc2 Ba6 11. Ba2 h6 12. Bh4 g5 13. Bg3 Nh7 14. Qe4 Qd7 15. Ne2 Bxe2 16. Kxe2 Nf6 17. Qxc6 Qxc6 18. Rxc6 Nd5 19. Rhc1 g4 20. Bxd5 exd5 21. Ne5 Bd6 22. Nxg4 Bxg3 23. Nxh6+ Kg7 24. Nf5+ Kg8 25. hxg3 Rfe8 26. Rxc7 Rf8 27. R1c6 b5 28. Rf6 b4 29. Nd6 bxa3 30. bxa3 Kg7 31. Rfxf7+ Rxf7 32. Rxf7+ Kg6 33. f4 Rg8 34. g4 Rh8 35. g3 Rb8 36. f5+ Kg5 37. Rg7+ Kf6 38. Rf7+ Kg5 39. Kf3 Rb6 40. Rg7+ Kh6 41. Ne8 Rb1 42. g5+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.29"]
[Round "3"]
[White "Helfferich, Gert"]
[Black "Siero, Paul"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "1012"]
[BlackElo "1160"]
[PlyCount "93"]
[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 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bc4 Bc5 5. 0-0 0-0 6. a3 a6 7. b4 b5 8. Bb3 Bb6 9. Nd5 Nxe4 10. Nxb6 cxb6 11. Bd5 Nf6 12. Bxc6 dxc6 13. Nxe5 Qd5 14. d4 c5 15. Bb2 cxb4 16. axb4 a5 17. Bc3 a4 18. Ra3 Be6 19. Bb2 Rac8 20. Rf3 Rcd8 21. c3 Ne4 22. Re3 f6 23. f3 Nxc3 24. Bxc3 fxe5 25. Rxe5 Qc4 26. Re3 Qb3 27. Qd2 Qc4 28. Rfe1 Rde8 29. f4 a3 30. f5 Bf7 31. d5 Rxe3 32. Rxe3 Bxd5 33. Rd3 Rd8 34. f6 gxf6 35. Bxf6 Qc6 36. Bxd8 Be4 37. Rxa3 Bxg2 38. Rg3+ Kf7 39. Rxg2 Qe4 40. Bxb6 Qb1+ 41. Kf2 Qf5+ 42. Kg1 Qb1+ 43. Kf2 Qf5+ 44. Ke1 Qe6+ 45. Re2 Qxb6 46. Qf4+ Kg6 47. Rg2+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.22"]
[Round "2"]
[White "Landsheer, Jos"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "C44"]
[WhiteElo "1699"]
[BlackElo "1012"]
[PlyCount "17"]
[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 e5 2. Nf3 Nc6 3. d4 f6 4. dxe5 Nxe5 5. Nxe5 fxe5 6. Qh5+ Ke7 7. Qxe5+ Kf7 8. Bc4+ Kg6 9. Qf5# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.15"]
[Round "1"]
[White "Helfferich, Gert"]
[Black "Volders, Wessel"]
[Result "0-1"]
[ECO "C50"]
[WhiteElo "1012"]
[BlackElo "1883"]
[PlyCount "52"]
[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 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. 0-0 d6 5. Nc3 Nf6 6. d3 h6 7. Bb5 0-0 8. Nd5 Bg4 9. c3 a6 10. Ba4 Nxd5 11. exd5 Ne7 12. c4 f5 13. Bc2 Ng6 14. Re1 Nh4 15. Be3 Bb4 16. Rf1 f4 17. a3 Bxf3 18. Qxf3 Nxf3+ 19. gxf3 fxe3 20. fxe3 Bc5 21. Rae1 Qg5+ 22. Kf2 Rf6 23. d4 exd4 24. f4 dxe3+ 25. Ke2 Qg2+ 26. Kd1 Qd2# 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.20"]
[Round "6"]
[White "Van Dorp, Teun"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "C60"]
[WhiteElo "1786"]
[BlackElo "944"]
[PlyCount "43"]
[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 e5 2. Nf3 Nc6 3. Bb5 Nge7 4. Ng5 f6 5. Bc4 d5 6. exd5 Nxd5 7. Qf3 Ncb4 8. a3 Nxc2+ 9. Kd1 Nxa1 10. Bxd5 Qd7 11. Nf7 Qa4+ 12. b3 Bg4 13. bxa4 Bxf3+ 14. gxf3 Rg8 15. Bb2 c6 16. Ba2 Nc2 17. Kxc2 Bc5 18. d4 Bb6 19. dxe5 fxe5 20. Re1 Kf8 21. Bxe5 Bxf2 22. Bd6# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.13"]
[Round "5"]
[White "Helfferich, Gert"]
[Black "Landheer, Ronald"]
[Result "0-1"]
[ECO "B08"]
[WhiteElo "944"]
[PlyCount "80"]
[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 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. e5 dxe5 6. Nxe5 0-0 7. Bc4 Nbd7 8. 0-0 Nb6 9. Bb3 Nfd7 10. Qe2 Nxe5 11. dxe5 e6 12. Rd1 Qe7 13. Bf4 a5 14. a4 Bd7 15. Nb5 Bc6 16. g3 Nd5 17. Bd2 Bxb5 18. Qxb5 c6 19. Qe2 Rfd8 20. c4 Nb4 21. h4 h5 22. g4 Qxh4 23. gxh5 gxh5 24. Kg2 Nd3 25. Be3 Nxe5 26. Rh1 Qg4+ 27. Qxg4 Nxg4 28. Bg5 f6 29. Bh4 Rd3 30. Bc2 Rd2 31. Rac1 Ne3+ 32. Kf3 Nxc2 33. Rhe1 Kf7 34. Re2 Nd4+ 35. Ke3 Rxe2+ 36. Kxd4 Rd8+ 37. Kc5 Rxb2 38. Bg3 Bf8+ 39. Bd6 Rxd6 40. Rg1 Rd8# 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.06"]
[Round "4"]
[White "Oosthout, Wouter"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1884"]
[BlackElo "944"]
[PlyCount "49"]
[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 e5 2. Nf3 Nc6 3. Bc4 h6 4. d4 d6 5. d5 Na5 6. Bd3 b6 7. c4 Bg4 8. Nbd2 Nf6 9. b4 Bxf3 10. gxf3 Nb7 11. Nb3 a5 12. bxa5 bxa5 13. a4 Be7 14. Rg1 0-0 15. Bxh6 Nh5 16. f4 Nxf4 17. Rxg7+ Kh8 18. Rg3 Bh4 19. Bxf4 Bxg3 20. Qh5+ Kg8 21. Bxg3 Qd7 22. Ke2 Kg7 23. Bh4 Rh8 24. Rg1+ Kf8 25. Qxh8# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.30"]
[Round "3"]
[White "Helfferich, Gert"]
[Black "Van der Heijden, Jaap"]
[Result "0-1"]
[ECO "B42"]
[WhiteElo "944"]
[BlackElo "1727"]
[PlyCount "36"]
[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 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Nc6 6. c3 Bc5 7. Nf3 h6 8. b4 Ba7 9. 0-0 Nf6 10. e5 Nd5 11. c4 Ndxb4 12. Be2 Ne7 13. a3 Nbc6 14. Bb2 Qc7 15. Re1 Qb6 16. Bd4 Nxd4 17. Nxd4 Qxd4 18. Qxd4 Bxd4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.23"]
[Round "2"]
[White "Zwaan, Gert Jan"]
[Black "Helfferich, Gert"]
[Result "1-0"]
[ECO "C60"]
[WhiteElo "1516"]
[BlackElo "944"]
[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. e4 e5 2. Nf3 Nc6 3. Bb5 Qf6 4. 0-0 d6 5. d3 Bg4 6. Nbd2 Qg6 7. Kh1 0-0-0 8. Bxc6 bxc6 9. c3 d5 10. Re1 Bc5 11. Rf1 dxe4 12. Nxe4 Qxe4 13. dxe4 Rxd1 14. Rxd1 Bxf2 15. Rf1 Bb6 16. Nxe5 Bh5 17. Nxc6 Nf6 18. Ne7+ Kd7 19. Nf5 g6 20. Ng3 Ke6 21. h3 c6 22. Bg5 Nd7 23. Rae1 Bc7 24. Bf4 Bd8 25. Ne2 Nc5 26. Nd4+ Kd7 27. g4 Nd3 28. Re2 g5 29. Bc1 Bg6 30. Rd2 Bxe4+ 31. Nf3 Bc7 32. Rxd3+ Bxd3 33. Rd1 Re8 34. Rxd3+ Kc8 35. Re3 Rd8 36. Kg2 Bf4 37. Re1 Bc7 38. Bxg5 1-0

