[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.07.07"]
[Round "7"]
[White "Van Dijk, Rens"]
[Black "Van Leeuwen, Sieb"]
[Result "1-0"]
[ECO "C60"]
[WhiteElo "1500"]
[PlyCount "59"]
[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. Nf3 Nc6 3. Bb5 Nge7 4. Nc3 a6 5. Be2 d6 6. d3 h6 7. 0-0 g5 8. Be3 Ng6 9. d4 f6 10. dxe5 fxe5 11. Nd5 Be6 12. Nd2 Bxd5 13. exd5 Nce7 14. c4 Nf5 15. Bh5 Rg8 16. Ne4 Be7 17. Qa4+ Qd7 18. Qxd7+ Kxd7 19. Rac1 b6 20. b4 a5 21. a3 axb4 22. axb4 Nxe3 23. fxe3 Ra3 24. c5 Rxe3 25. c6+ Kd8 26. Ra1 Ke8 27. Ra8+ Bd8 28. Nf6+ Kf7 29. Nxg8+ Kxg8 30. Rxd8+ 1-0

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.23"]
[Round "5"]
[White "Van Leeuwen, Sieb"]
[Black "Molsbergen, Chris"]
[Result "1/2-1/2"]
[ECO "D03"]
[BlackElo "1508"]
[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. d4 Nf6 2. Nf3 e6 3. Bg5 Be7 4. e3 d5 5. Bxf6 Bxf6 6. c4 dxc4 7. Bxc4 0-0 8. Nbd2 c5 9. Ne4 cxd4 10. Nxf6+ Qxf6 11. Qxd4 Qxd4 12. Nxd4 a6 13. 0-0 b5 14. Be2 Bb7 15. Bf3 Bxf3 16. Nxf3 Nc6 17. a3 Rfd8 18. b4 h6 19. Ra2 a5 20. bxa5 Rxa5 21. Rc2 Ra6 22. h3 e5 23. Rfc1 Rd6 24. Nh2 Na5 25. Rc8+ Kh7 26. R1c5 Rab6 27. Ng4 f6 28. e4 Nc4 29. a4 Rd4 30. axb5 Nd6 31. R8c6 Rxb5 32. Rxb5 Nxb5 33. f3 Nd6 34. Rc7 Kg6 35. Ne3 1/2-1/2

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "4"]
[White "Bey, Jerry Sr"]
[Black "Van Leeuwen, Sieb"]
[Result "1-0"]
[ECO "A00"]
[WhiteElo "1635"]
[PlyCount "75"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 Nc6 4. Ng3 e5 5. Nf3 Be7 6. Bc4 f6 7. h3 Na5 8. Bb5+ c6 9. Be2 Bd7 10. a3 c5 11. c3 Nc6 12. d3 Be6 13. 0-0 Qd7 14. cxd4 cxd4 15. Nh2 g6 16. Bd2 h5 17. f4 exf4 18. Bxf4 h4 19. Nh1 g5 20. Bd2 Ne5 21. Nf2 Rc8 22. Rc1 Rxc1 23. Qxc1 Bd8 24. Qc2 Rh6 25. Nhg4 Nxg4 26. Nxg4 Rg6 27. Bb4 Nh6 28. Ne5 Qh7 29. Qc5 Rg8 30. Bh5+ Nf7 31. Bxf7+ Qxf7 32. Nxf7 Kxf7 33. Qxa7 g4 34. Qxb7+ Kg6 35. Kh1 gxh3 36. gxh3 Kh6 37. Rg1 Re8 38. Qg7+ 1-0

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "6"]
[White "Van Leeuwen, Sieb"]
[Black "Bregman, Koen"]
[Result "0-1"]
[ECO "D00"]
[BlackElo "1672"]
[PlyCount "68"]
[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 Nf6 2. Bf4 d5 3. e3 g6 4. Nf3 Bg7 5. Nc3 0-0 6. h4 Bg4 7. Be2 Nh5 8. Be5 f6 9. Bh2 c6 10. Nd2 Bxe2 11. Qxe2 f5 12. Nf3 Re8 13. Be5 Nd7 14. Bxg7 Nxg7 15. 0-0-0 e5 16. dxe5 Nxe5 17. Nxe5 Rxe5 18. f4 Re7 19. Qf3 Qb6 20. Rh3 Rae8 21. Rd3 Ne6 22. Nd1 Nc5 23. Rd4 Ne6 24. Rd3 d4 25. c3 dxc3 26. Rxc3 Rd8 27. g4 Red7 28. Rh1 Qa5 29. a3 fxg4 30. Qxg4 Qd5 31. Qh3 Nc5 32. Kc2 Ne4 33. Rb3 Qc4+ 34. Rc3 Nxc3 0-1

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.06.02"]
[Round "3"]
[White "Duijnisveld, Arnold"]
[Black "Van Leeuwen, Sieb"]
[Result "1/2-1/2"]
[ECO "B90"]
[WhiteElo "1532"]
[PlyCount "126"]
[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. Nf3 d6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 g6 6. Be2 Bg7 7. Be3 Nf6 8. 0-0 a6 9. a4 0-0 10. Kh1 Bd7 11. Qd2 Ng4 12. Bxg4 Bxg4 13. f4 Nxd4 14. Bxd4 Bxd4 15. Qxd4 Bd7 16. Nd5 Rc8 17. c3 Rc6 18. f5 f6 19. fxg6 hxg6 20. Nf4 Kh7 21. Qf2 g5 22. Nd5 Rc4 23. Qc2 Kg7 24. Ne3 Rc6 25. Qf2 Rh8 26. Nf5+ Bxf5 27. Qxf5 Qc7 28. Rae1 Rc4 29. Rd1 Rxe4 30. Qd5 Rxa4 31. Rde1 Qd7 32. Re6 Rah4 33. h3 Re8 34. Rfe1 Kf8 35. c4 Qc6 36. Qd3 g4 37. Kh2 gxh3 38. gxh3 Qxc4 39. Qe3 Qf4+ 40. Qxf4 Rxf4 41. Kg3 Rf5 42. R6e3 Re5 43. h4 Kf7 44. Rxe5 dxe5 45. h5 b5 46. Ra1 Ra8 47. b4 Kg7 48. Rc1 Kh6 49. Rc7 Kxh5 50. Rxe7 Rg8+ 51. Kf3 Rg6 52. Re6 Kh4 53. Rxa6 Rg3+ 54. Ke2 Rg2+ 55. Kf3 Rg3+ 56. Ke2 f5 57. Rb6 f4 58. Rxb5 f3+ 59. Kf2 Kg4 60. Rxe5 Rg2+ 61. Kf1 Kg3 62. Rg5+ Kh2 63. Rh5+ Kg3 1/2-1/2

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.05.26"]
[Round "2"]
[White "Van Leeuwen, Sieb"]
[Black "Bingen, Stanley"]
[Result "1-0"]
[ECO "D03"]
[BlackElo "1219"]
[PlyCount "91"]
[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 d5 2. Nf3 Nf6 3. Bg5 e6 4. Nc3 Be7 5. e3 c6 6. h3 Bd7 7. Bf4 c5 8. Nb5 Bxb5 9. Bxb5+ Nbd7 10. Be2 cxd4 11. exd4 Ne4 12. c3 Rc8 13. Nd2 Nef6 14. Qb3 Rb8 15. Bxb8 Qxb8 16. Bb5 0-0 17. Bxd7 Nxd7 18. 0-0-0 Rc8 19. h4 b6 20. g3 Nf6 21. h5 h6 22. Rdg1 Ng4 23. Rf1 Bf6 24. Qd1 Nxf2 25. Rxf2 Qxg3 26. Rxf6 Rxc3+ 27. bxc3 Qxc3+ 28. Qc2 Qxc2+ 29. Kxc2 gxf6 30. Nf3 Kf8 31. Kb3 Ke7 32. Kb4 Kd7 33. Rg1 Kd6 34. Rg7 Ke7 35. Rh7 f5 36. Rxh6 Kf8 37. Rh8+ Kg7 38. Ra8 Kh6 39. Rxa7 Kxh5 40. Rxf7 Kg4 41. Ne5+ Kf4 42. Kc3 Ke4 43. Rb7 f4 44. Rxb6 f3 45. Nxf3 Kxf3 46. Rxe6 1-0

[Event "Leiden SB-chB"]
[Site "Leiden"]
[Date "2004.05.19"]
[Round "1"]
[White "Verhoogt, Erwin"]
[Black "Van Leeuwen, Sieb"]
[Result "1-0"]
[ECO "D20"]
[WhiteElo "1644"]
[PlyCount "93"]
[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 d5 2. Nf3 Nf6 3. c4 dxc4 4. Nc3 e6 5. e4 Nc6 6. Bxc4 Bb4 7. Bg5 h6 8. Bxf6 Qxf6 9. 0-0 Bxc3 10. bxc3 0-0 11. Rb1 b6 12. Qe2 a5 13. Bb5 Bb7 14. Rfe1 e5 15. Bxc6 Qxc6 16. Nxe5 Qxc3 17. Red1 Qa3 18. Rb3 Qe7 19. Re3 Rfe8 20. f4 Ba6 21. Qc2 Bb7 22. Rc3 Rac8 23. a4 f6 24. Qb3+ Kh7 25. Nc4 Qxe4 26. Rg3 Bd5 27. Qc3 Qxf4 28. Rf1 Qe4 29. Ne3 Be6 30. Nc2 Re7 31. Re1 Qb7 32. Qd3+ Kh8 33. Rge3 Qd5 34. Qf1 Rce8 35. Qf2 Qd7 36. Qe2 c6 37. h3 f5 38. Re5 c5 39. d5 Qxa4 40. dxe6 g6 41. Qd2 Rb8 42. Qxh6+ Rh7 43. Qd2 Re7 44. Qf2 c4 45. Qd4 Kg8 46. Ne3 Rc8 47. Nd5 1-0

[Event "NED-ch M corr"]
[Site "Netherlands"]
[Date "1993.??.??"]
[Round "?"]
[White "Van Leeuwen, Sieb"]
[Black "Van Bakel, W."]
[Result "1-0"]
[ECO "B09"]
[PlyCount "39"]
[EventDate "1993.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "NED"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 0-0 6. Be3 c6 7. Bd3 Nbd7 8. h3 Qc7 9. e5 Nd5 10. Nxd5 cxd5 11. Qe2 b6 12. g4 Bb7 13. 0-0-0 e6 14. h4 f5 15. gxf5 gxf5 16. Ng5 Rae8 17. Qh5 h6 18. Nf3 Rf7 19. Rdg1 Kh8 20. Qxf7 1-0

