[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.29"]
[Round "2"]
[White "Beetstra, Jaap"]
[Black "Sonneveldt, Peter"]
[Result "1-0"]
[ECO "D42"]
[WhiteElo "1721"]
[BlackElo "1428"]
[PlyCount "51"]
[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 c6 2. d4 d5 3. exd5 cxd5 4. c4 dxc4 5. Bxc4 Nf6 6. Nc3 e6 7. Nf3 Nc6 8. 0-0 Be7 9. a3 0-0 10. Bd3 b6 11. Bf4 Bd6 12. Bg5 Be7 13. Rc1 Bb7 14. Bb1 Rc8 15. Qd3 g6 16. h4 Re8 17. Ba2 Nd5 18. Ne4 Bxg5 19. hxg5 Nce7 20. Ne5 Kg7 21. Rxc8 Bxc8 22. Qf3 Rf8 23. Ng4 Bb7 24. Ngf6 Qc7 25. Qh3 Rh8 26. Qh6# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.26"]
[Round "7"]
[White "Sonneveldt, Peter"]
[Black "De Waard, Ad"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "1657"]
[BlackElo "1411"]
[PlyCount "37"]
[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 d6 2. d4 Nf6 3. Nc3 g6 4. f3 Bg7 5. Be3 0-0 6. Qd2 e5 7. 0-0-0 exd4 8. Bxd4 Nc6 9. Be3 Be6 10. Nge2 a6 11. Nf4 b5 12. Ncd5 Bxd5 13. Nxd5 Nxd5 14. exd5 Ne5 15. Bh6 Nc4 16. Bxc4 Bxh6 17. Qxh6 bxc4 18. Rd4 c3 19. Rh4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.05"]
[Round "4"]
[White "Sonneveldt, Peter"]
[Black "Zwaan, Gert Jan"]
[Result "1/2-1/2"]
[ECO "A34"]
[WhiteElo "1657"]
[BlackElo "1511"]
[PlyCount "104"]
[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 c5 2. c4 d6 3. Nf3 Bg4 4. Be2 Nc6 5. Nc3 Nf6 6. d3 e6 7. Ng5 Bxe2 8. Qxe2 Nd4 9. Qd1 Be7 10. f4 e5 11. f5 Qd7 12. 0-0 h6 13. Nf3 a6 14. a4 Nc6 15. b3 Qd8 16. Bd2 Nb4 17. Be1 h5 18. Nd5 Nbxd5 19. cxd5 Qb6 20. Kh1 Ng4 21. Qb1 Qc7 22. Nd2 Nf6 23. Nc4 Bd8 24. Qb2 b6 25. Qe2 Rb8 26. Bd2 Qe7 27. Rfe1 a5 28. Qf3 Kd7 29. Rf1 Bc7 30. Rab1 Rbg8 31. Bg5 Bd8 32. Ne3 Qf8 33. Qe2 Kc7 34. Qc2 g6 35. Qf2 Ng4 36. Bxd8+ Kxd8 37. Qe2 f6 38. Nxg4 hxg4 39. Qxg4 g5 40. Qe2 Rh6 41. Rb2 Qg7 42. Rf2 Qh7 43. g3 Rh3 44. Rg2 Rh8 45. Kg1 Rh6 46. Qc2 Qc7 47. Qc4 R8h7 48. Rbf2 Ke7 49. Qc2 Kd8 50. Qd2 Kc8 51. Qc2 Kb8 52. Qc4 Qd7 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.29"]
[Round "3"]
[White "Gorter, Peter"]
[Black "Sonneveldt, Peter"]
[Result "1/2-1/2"]
[ECO "C50"]
[WhiteElo "1428"]
[BlackElo "1657"]
[PlyCount "32"]
[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 exd4 4. Bc4 h6 5. c3 d3 6. 0-0 d6 7. Nd4 Nf6 8. Re1 Be7 9. Nf5 Bxf5 10. exf5 Qd7 11. Bxd3 0-0-0 12. Be3 Nd5 13. Bd4 Nxd4 14. cxd4 Bf6 15. Nc3 Nxc3 16. bxc3 Rhe8 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.22"]
[Round "2"]
[White "Sonneveldt, Peter"]
[Black "Nieuwland, Huib"]
[Result "0-1"]
[ECO "B30"]
[WhiteElo "1657"]
[BlackElo "1849"]
[PlyCount "76"]
[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 c5 2. c4 Nc6 3. Nf3 e5 4. Nc3 d6 5. d3 f5 6. exf5 Bxf5 7. Nd5 Be7 8. Be2 Nf6 9. Nxe7 Qxe7 10. Bg5 0-0 11. h3 h6 12. Be3 Nd4 13. Qd2 a6 14. 0-0-0 b5 15. g4 Nxe2+ 16. Qxe2 Nxg4 17. hxg4 Bxg4 18. Rhg1 Bxf3 19. Qd2 Kh7 20. Rde1 Qe6 21. b3 Qf5 22. Rg3 Rf7 23. Reg1 b4 24. Rg6 Qxg6 25. Rxg6 Kxg6 26. Qe1 Rf5 27. Qg1+ Kh7 28. Qg3 a5 29. Qh4 g5 30. Qh3 Kg6 31. Kb2 a4 32. Qh2 axb3 33. axb3 h5 34. d4 exd4 35. Bxd4 cxd4 36. Qxd6+ Rf6 37. Qxd4 Raf8 38. Qd3+ Kh6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.15"]
[Round "1"]
[White "Van Vliet, Harry"]
[Black "Sonneveldt, Peter"]
[Result "1-0"]
[ECO "D46"]
[WhiteElo "2033"]
[BlackElo "1657"]
[PlyCount "65"]
[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 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Bd6 6. Bd3 Nbd7 7. 0-0 0-0 8. e4 dxe4 9. Nxe4 Nxe4 10. Bxe4 e5 11. dxe5 f5 12. Qxd6 fxe4 13. Ng5 Nb6 14. Nxe4 Nxc4 15. Qxd8 Rxd8 16. f4 Bf5 17. Ng3 Bd3 18. Re1 Nb6 19. Ne4 Bxe4 20. Rxe4 Rd1+ 21. Kf2 Rad8 22. Re1 Rxe1 23. Kxe1 Nd5 24. Ke2 Re8 25. Be3 a6 26. Rd1 Kf7 27. Kf3 Ke6 28. Ke4 Kf7 29. Rd3 Rd8 30. Bc5 g6 31. g4 Ke8 32. f5 gxf5+ 33. gxf5 1-0

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.07.07"]
[Round "7"]
[White "Sonneveldt, Peter"]
[Black "Verhoogt, Erwin"]
[Result "1/2-1/2"]
[ECO "A34"]
[WhiteElo "1676"]
[BlackElo "1644"]
[PlyCount "73"]
[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 c5 2. c4 Nc6 3. Nf3 d6 4. Nc3 Nf6 5. h3 e6 6. d4 cxd4 7. Nxd4 Bd7 8. Ndb5 Bc8 9. Be3 a6 10. Nd4 Be7 11. Be2 Qc7 12. Qd2 Ne5 13. Rc1 0-0 14. 0-0 Rd8 15. Nf3 Nxf3+ 16. Bxf3 Bd7 17. Rfd1 Bc6 18. Qe2 b6 19. Nd5 Bxd5 20. cxd5 Qb7 21. Rc6 b5 22. Rdc1 Rac8 23. Qc2 Rxc6 24. Qxc6 Qxc6 25. Rxc6 exd5 26. exd5 Ra8 27. Bf4 Ne8 28. Bg4 Ra7 29. Bc8 a5 30. Be3 Ra8 31. Bg4 Kf8 32. Bd2 Nf6 33. Rc8+ Rxc8 34. Bxc8 Bd8 35. Bb7 Ne4 36. Be3 Ke7 37. Bc6 1/2-1/2

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.23"]
[Round "5"]
[White "Sonneveldt, Peter"]
[Black "Van Dorp, Teun"]
[Result "0-1"]
[ECO "B38"]
[WhiteElo "1676"]
[BlackElo "1770"]
[PlyCount "136"]
[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 c5 2. c4 Nc6 3. Nf3 g6 4. d4 cxd4 5. Nxd4 Bg7 6. Be3 e6 7. Nc3 Nxd4 8. Bxd4 Bxd4 9. Qxd4 Qf6 10. e5 Qg7 11. Nb5 Kd8 12. Be2 f6 13. f4 fxe5 14. fxe5 Ne7 15. Bf3 Nc6 16. Bxc6 bxc6 17. Nd6 Rf8 18. 0-0-0 Qh6+ 19. Kb1 Qf4 20. Qxf4 Rxf4 21. Rhf1 Rg4 22. g3 a5 23. Rf8+ Kc7 24. Rf7 Ba6 25. Rxh7 a4 26. a3 Rf8 27. c5 Rg5 28. Re1 Bd3+ 29. Ka2 Rg4 30. Re3 Bc2 31. Rf7 Rb8 32. Rf2 Bb3+ 33. Kb1 Rd4 34. Re1 Rd5 35. Rf6 Rxc5 36. Rf2 Rd5 37. Kc1 Rh8 38. Rfe2 Rh5 39. Ne8+ Kb6 40. Nf6 Rc5+ 41. Kb1 Rd5 42. Nxh5 gxh5 43. Kc1 Bc4 44. Re4 Rc5 45. Kd2 Bb3 46. Ke3 Ka5 47. Kf4 Rd5 48. R4e2 Bd1 49. Rf2 Bg4 50. Re4 Bf5 51. Re3 Kb5 52. Kg5 Bg4 53. Kh4 Rd1 54. Kg5 Kc5 55. Re4 Kb5 56. Rb4+ Ka5 57. Rff4 Rd2 58. Rxa4+ Kb6 59. Rab4+ Kc7 60. Rb3 Rxh2 61. Kf6 Be2 62. Ke7 Bb5 63. Rd4 c5 64. Rh4 Rxh4 65. gxh4 Kc6 66. Rg3 Kd5 67. Kf6 d6 68. exd6 Kxd6 0-1

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "6"]
[White "Bottema, Timo"]
[Black "Sonneveldt, Peter"]
[Result "1/2-1/2"]
[ECO "B18"]
[WhiteElo "1569"]
[BlackElo "1676"]
[PlyCount "80"]
[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 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. Bc4 e6 8. 0-0 Ngf6 9. Re1 Be7 10. Bd2 Qc7 11. Bb3 h6 12. Qe2 Nd5 13. Rad1 0-0 14. c3 Rfe8 15. Bc1 Rad8 16. Bc2 Bxc2 17. Qxc2 Bd6 18. Ne4 Be7 19. a3 N5f6 20. c4 Nxe4 21. Qxe4 Nf6 22. Qc2 c5 23. b3 cxd4 24. Nxd4 a6 25. Bb2 Qf4 26. Ne2 Qc7 27. Ng3 Rxd1 28. Rxd1 Rd8 29. h3 Rxd1+ 30. Qxd1 Qc6 31. Qd3 Nd7 32. b4 Nf6 33. Qd4 Kf8 34. f3 Qc7 35. Ne4 Ke8 36. Kf2 Nxe4+ 37. Qxe4 g6 38. Qd4 h5 39. Qh8+ Kd7 40. Qd4+ Ke8 1/2-1/2

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "4"]
[White "Wagemans, Ed"]
[Black "Sonneveldt, Peter"]
[Result "0-1"]
[ECO "B13"]
[WhiteElo "1874"]
[BlackElo "1676"]
[PlyCount "78"]
[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 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nf3 Bf5 6. Ne5 e6 7. Bd3 Bxd3 8. Qxd3 dxc4 9. Qxc4 Nbd7 10. 0-0 Be7 11. Nc3 0-0 12. Bg5 Nb6 13. Qd3 Nfd5 14. Nxd5 Nxd5 15. Bxe7 Qxe7 16. Rac1 Rac8 17. Rc4 Nb6 18. Rc5 Rcd8 19. Rfc1 Nd5 20. a3 h6 21. Qg3 Kh7 22. h4 Qf6 23. Qd3+ Kg8 24. Nf3 Kh8 25. g3 Kg8 26. Kg2 Kh8 27. Ng5 hxg5 28. hxg5 Qf5 29. Qe2 g6 30. f4 Kg7 31. Rb5 b6 32. a4 Rh8 33. Qe5+ Qxe5 34. dxe5 Rc8 35. Rxc8 Rxc8 36. a5 Rc5 37. Rb3 Rxa5 38. Kf3 Ra4 39. Ke2 Rb4 0-1

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.02"]
[Round "3"]
[White "Sonneveldt, Peter"]
[Black "Jansen, Bert"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "1676"]
[BlackElo "1540"]
[PlyCount "31"]
[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 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 0-0 6. Bg5 c6 7. a4 Nbd7 8. Qd2 Qc7 9. 0-0 e5 10. Rad1 exd4 11. Nxd4 Ne5 12. f4 Neg4 13. h3 h5 14. hxg4 hxg4 15. f5 Re8 16. fxg6 1-0

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.05.26"]
[Round "2"]
[White "Hoogenboom, Gabri"]
[Black "Sonneveldt, Peter"]
[Result "1/2-1/2"]
[ECO "C24"]
[WhiteElo "1575"]
[BlackElo "1676"]
[PlyCount "78"]
[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 e5 2. Bc4 Nf6 3. d4 Qe7 4. Nf3 Qb4+ 5. Nbd2 d5 6. c3 Qe7 7. exd5 exd4+ 8. Kf1 dxc3 9. bxc3 c6 10. Qb3 Nxd5 11. Bb2 Be6 12. Nd4 Qd7 13. Nxe6 fxe6 14. Re1 Be7 15. Nf3 0-0 16. Nd4 Bc5 17. Re2 Bxd4 18. cxd4 b5 19. Bd3 Nf4 20. Re4 Nxd3 21. Qxd3 Na6 22. g3 Nc7 23. Kg2 Qd5 24. Ba3 Rf7 25. Qc2 Qf5 26. f4 Qd5 27. Rc1 Re8 28. Bb4 Na6 29. Bd2 Rc8 30. Kf2 Nb8 31. Ree1 Re8 32. a3 h6 33. Qc5 Qd7 34. Bb4 Na6 35. Qd6 Nxb4 36. Qxd7 Rxd7 37. axb4 Kf7 38. f5 Rde7 39. fxe6+ Rxe6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.07.01"]
[Round "7"]
[White "Sonneveldt, Peter"]
[Black "Bingen, Stanley"]
[Result "1-0"]
[ECO "A40"]
[WhiteElo "1647"]
[BlackElo "1187"]
[PlyCount "129"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. d4 Nc6 3. d5 Nce7 4. c4 d6 5. Nc3 a6 6. Nf3 Bg4 7. Be2 Nf6 8. Ng5 Bd7 9. h3 h6 10. Nf3 Ng6 11. Be3 c6 12. Qd2 Be7 13. Bd3 c5 14. a4 a5 15. Nb5 b6 16. 0-0-0 0-0 17. Kb1 Bxb5 18. axb5 Nh7 19. g4 Nh4 20. Nxh4 Bxh4 21. f4 g5 22. f5 Nf6 23. Qg2 a4 24. Ka2 Ra7 25. Ka3 Qa8 26. Rhg1 Kg7 27. Bc2 Rg8 28. Qe2 Kf8 29. Rdf1 Ke7 30. Rg2 Rc7 31. Bd2 Rh8 32. Rfg1 Qa7 33. Ra1 Qa8 34. Rgg1 Ra7 35. Rg2 Rb8 36. Rag1 Rbb7 37. Qd1 Qh8 38. Qe2 Ra8 39. Ra1 Rg8 40. Bxa4 Ra7 41. Kb3 Rga8 42. Ra3 Qb8 43. Rg1 Qb7 44. Qf3 Qb8 45. Rga1 Kf8 46. Kc2 Kg7 47. Kd1 Qh8 48. Bc2 Qb8 49. Rxa7 Rxa7 50. Rxa7 Qxa7 51. Qa3 Qxa3 52. bxa3 Bg3 53. a4 Bf4 54. Be1 Kf8 55. a5 bxa5 56. b6 Nd7 57. b7 Nb8 58. Bxa5 Ke7 59. Bc7 Na6 60. b8Q Nxb8 61. Bxb8 f6 62. Ba4 Be3 63. Kc2 Bd4 64. Kb3 Kf7 65. Bc6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.24"]
[Round "6"]
[White "Sonneveldt, Peter"]
[Black "Schreur, Gertjan"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "1647"]
[BlackElo "1710"]
[PlyCount "80"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Nf6 3. d4 Nxd5 4. Nf3 g6 5. Be2 Bg7 6. 0-0 0-0 7. c3 Nd7 8. Qb3 N5b6 9. Be3 c6 10. Nbd2 Qc7 11. c4 Nf6 12. h3 Bf5 13. Rad1 Nbd7 14. Rfe1 c5 15. d5 b6 16. Nh4 e5 17. dxe6 Bxe6 18. Nhf3 Rad8 19. Nb1 Nb8 20. Nc3 Nc6 21. Ng5 Bf5 22. Nf3 Na5 23. Qa3 Bc2 24. Rc1 Bd3 25. b3 Bxe2 26. Rxe2 Nc6 27. Rce1 Rd3 28. Qc1 a6 29. Bg5 Nh5 30. Nd5 Qb8 31. Qc2 Rxf3 32. gxf3 Nd4 33. Qe4 Ng3 34. fxg3 Qxg3+ 35. Rg2 Nxf3+ 36. Kf1 Qxh3 37. Ree2 Bd4 38. Be3 Qh1+ 39. Kf2 h5 40. Qxf3 Re8 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.17"]
[Round "5"]
[White "Bakker, Joop"]
[Black "Sonneveldt, Peter"]
[Result "1-0"]
[ECO "A25"]
[WhiteElo "1932"]
[BlackElo "1647"]
[PlyCount "71"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. c4 e5 2. g3 Nc6 3. Bg2 Nf6 4. Nc3 Be7 5. e3 0-0 6. Nge2 d6 7. d4 exd4 8. exd4 Bf5 9. 0-0 Qd7 10. Nf4 Nd8 11. Nfd5 Re8 12. Re1 Nxd5 13. cxd5 Bf8 14. Be3 f6 15. Rc1 Nf7 16. Qb3 b6 17. Ne2 Ng5 18. h4 Nf7 19. Nf4 Rac8 20. Ne6 Nd8 21. Nf4 Kh8 22. Bf1 Qf7 23. Qc3 Re7 24. Bd2 g5 25. hxg5 fxg5 26. Ne6 Nxe6 27. dxe6 Qg7 28. d5 h6 29. Qf3 Qg6 30. g4 Bxe6 31. dxe6 Rxe6 32. Bc3+ Bg7 33. Rxe6 Qxe6 34. Re1 Qd7 35. Bc4 Rf8 36. Qxf8+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.10"]
[Round "4"]
[White "Sonneveldt, Peter"]
[Black "Van der Horst, Joop"]
[Result "1/2-1/2"]
[ECO "C65"]
[WhiteElo "1647"]
[BlackElo "1437"]
[PlyCount "42"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Be7 5. d3 d6 6. h3 Bd7 7. Be3 0-0 8. Qd2 a6 9. Ba4 Qc8 10. a3 Nd8 11. Bxd7 Qxd7 12. 0-0 c6 13. Na4 Qc7 14. Bb6 Qd7 15. Ba5 Qe8 16. Nb6 Rb8 17. c4 Ne6 18. Qe3 Nh5 19. d4 f6 20. Kh2 Nhf4 21. g3 Ng6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.03"]
[Round "3"]
[White "Van der Heijden, Jaap"]
[Black "Sonneveldt, Peter"]
[Result "1-0"]
[ECO "C61"]
[WhiteElo "1664"]
[BlackElo "1647"]
[PlyCount "86"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 exd4 5. c3 Bc5 6. d3 Ne7 7. Bg5 0-0 8. 0-0 f6 9. Bf4 Ng6 10. Bc4+ Kh8 11. Bg3 d6 12. a4 a6 13. b4 Ba7 14. Qd2 Qe7 15. Na3 Bd7 16. Nc2 dxc3 17. Qxc3 Ne5 18. Bb3 c6 19. Nd4 f5 20. exf5 Bxf5 21. Nxf5 Rxf5 22. d4 Ng6 23. Rae1 Qf8 24. Re6 Rd8 25. Rfe1 Nf4 26. Re7 Nd5 27. Bxd5 Rxd5 28. Rxb7 Bxd4 29. Qxc6 Rf5 30. Qxa6 Rxf2 31. Kh1 Rf5 32. Qd3 Be5 33. Rb5 Qf6 34. Rd5 Rf8 35. Rg1 h5 36. Bxe5 dxe5 37. a5 Rf4 38. b5 Rh4 39. b6 e4 40. Qg3 Kg8 41. Rd6 Qe7 42. b7 Rg4 43. Qb3+ Kh7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.05.20"]
[Round "1"]
[White "Sonneveldt, Peter"]
[Black "Vriend, Wim"]
[Result "0-1"]
[ECO "C48"]
[WhiteElo "1647"]
[BlackElo "1998"]
[PlyCount "80"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Nxd4 exd4 6. e5 dxc3 7. exf6 Qxf6 8. bxc3 c6 9. Be2 d5 10. d4 Bd6 11. 0-0 0-0 12. Be3 Bf5 13. Re1 Rfe8 14. Qd2 h6 15. c4 dxc4 16. Bxc4 Qg6 17. c3 Re7 18. Bf4 Rae8 19. Rxe7 Rxe7 20. Bxd6 Qxd6 21. Re1 Kf8 22. Rxe7 Qxe7 23. h3 Be6 24. Bb3 b5 25. Bxe6 Qxe6 26. Qc2 a5 27. Qb2 Qe1+ 28. Kh2 b4 29. cxb4 Qxb4 30. Qc2 Qd6+ 31. Kg1 Qxd4 32. Qxc6 Qa1+ 33. Kh2 Qxa2 34. Qc8+ Ke7 35. Qc7+ Kf6 36. Qc3+ Kg6 37. Qd3+ f5 38. Qa6+ Kh7 39. f3 a4 40. Qb5 Qc2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.06.11"]
[Round "4"]
[White "Janssen, Arthur"]
[Black "Sonneveldt, Peter"]
[Result "1-0"]
[ECO "C97"]
[WhiteElo "1828"]
[PlyCount "47"]
[EventDate "2002.05.21"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Be7 7. Re1 d6 8. c3 0-0 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Bb7 13. Nf1 Nc4 14. d5 Nb6 15. Ne3 Rfe8 16. Nf5 Bf8 17. Bg5 Nbd7 18. Qd2 a5 19. N3h4 b4 20. Bxf6 Nxf6 21. Qg5 Bc8 22. Re3 Rd8 23. Rg3 Ne8 24. Nh6+ 1-0

