[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Aasum, Anker"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "A00"]
[PlyCount "100"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. Ng3 Be6 5. Nf3 Bd6 6. c3 c5 7. Bb5+ Nd7 8. Qe2 f6 9. Bc4 Qe7 10. Bxe6 Qxe6 11. Nf5 Kf7 12. Qc4 Bf8 13. Qb5 g6 14. Ng3 Rb8 15. h4 h5 16. 0-0 Ne7 17. b3 Nc6 18. Bb2 a6 19. Qe2 Bh6 20. cxd4 cxd4 21. Rfc1 Nb4 22. Qc4 Qxc4 23. Rxc4 Nd3 24. Ba3 Rhc8 25. Kf1 b5 26. Rxc8 Rxc8 27. Ne1 Nxe1 28. Kxe1 Rc2 29. Bb4 Nb8 30. Kd1 d3 31. Bc3 a5 32. a3 Nc6 33. Rc1 b4 34. Rxc2 dxc2+ 35. Kxc2 bxc3 36. dxc3 Bf8 37. b4 Ke6 38. Kd3 Be7 39. f3 Bd8 40. Kc4 Kd6 41. Nf1 Bb6 42. g3 Bf2 43. Kb3 g5 44. hxg5 fxg5 45. Kc2 h4 46. g4 Be1 47. Kd3 Ne7 48. b5 Ng6 49. c4 Nf4+ 50. Kc2 Kc5 0-1

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Aasum, Anker"]
[Result "1-0"]
[ECO "A00"]
[PlyCount "105"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. Ng3 Be6 5. Nf3 f6 6. Be2 Nc6 7. Bb5 Nge7 8. 0-0 Qd7 9. c3 0-0-0 10. cxd4 exd4 11. a3 h5 12. b4 h4 13. Ne2 Bg4 14. Nfxd4 Qxd4 15. Nxd4 Bxd1 16. Nxc6 Nxc6 17. Rxd1 Nd4 18. Bc4 b5 19. Bf1 c6 20. h3 Kb7 21. Ra2 Nb3 22. Rc2 Bd6 23. d4 Nxc1 24. Rcxc1 Bf4 25. Rc3 a6 26. Be2 Rhe8 27. Bf3 Rd6 28. g3 hxg3 29. fxg3 Bh6 30. Kf2 Red8 31. d5 cxd5 32. exd5 Rc8 33. Rxc8 Kxc8 34. Ke2 Kc7 35. Kd3 f5 36. Re1 g6 37. Kc3 Bg7+ 38. Kb3 Bd4 39. Re2 Kd7 40. g4 f4 41. h4 Be3 42. h5 gxh5 43. gxh5 Ke7 44. Rh2 Rh6 45. Rg2 Kf7 46. Rc2 Ke7 47. a4 bxa4+ 48. Kxa4 Bb6 49. Rc6 Rxc6 50. dxc6 Bc7 51. h6 Kd8 52. h7 Be5 53. Ka5 1-0

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Dieu, Bruno"]
[Result "1/2-1/2"]
[ECO "A00"]
[PlyCount "98"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. Ng3 Ne7 5. Bc4 Ng6 6. Nf3 Nd7 7. d3 Nb6 8. Bb3 Bg4 9. h3 Bb4+ 10. Kf1 Bxf3 11. Qxf3 0-0 12. Nf5 Nh4 13. Qg4 Nxf5 14. Qxf5 Bd6 15. h4 Qd7 16. g4 Qxf5 17. gxf5 a5 18. a3 a4 19. Ba2 Be7 20. Ke2 Kh8 21. Bd2 Nd7 22. Rag1 h6 23. Rg2 Bf6 24. Bg5 Ra6 25. Rhg1 Rb6 26. b4 Rc6 27. Kd1 Bxg5 28. hxg5 Rc3 29. gxh6 gxh6 30. Kc1 Rxa3 31. Kb2 Rc3 32. Rg7 c5 33. bxc5 Rxc5 34. Bxf7 Nf6 35. Be6 a3+ 36. Kb1 Rb5+ 37. Bb3 h5 38. R1g6 Rb6 39. Rc7 Ne8 40. Rxb6 Nxc7 41. Rh6+ Kg7 42. Rxh5 Nb5 43. Rg5+ Kh6 44. Rg6+ Kh5 45. Ka2 Ra8 46. Bf7 Nc3+ 47. Ka1 Rf8 48. Rg7+ Kh6 49. f6 b5 1/2-1/2

[Event "Theme 4/5 corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Gnirk, Hajo"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "71"]
[EventDate "1998.??.??"]
[EventType "tourn (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. d4 Bb4 7. Ne5 Qf5 8. Bc4 Ne7 9. 0-0 Bxc3 10. bxc3 d6 11. f3 dxe5 12. fxe4 Qg6 13. Bf7+ Qxf7 14. Rxf7 Kxf7 15. Ba3 Nbc6 16. Qf3+ Ke8 17. Rf1 exd4 18. cxd4 Kd8 19. Qf7 Re8 20. Qxg7 Ng8 21. Rf8 Nce7 22. d5 Bd7 23. e5 Rxf8 24. Qxf8+ Be8 25. d6 cxd6 26. exd6 Nc6 27. Qxg8 b5 28. Qxh7 Bd7 29. Qg8+ Be8 30. h4 a5 31. h5 Ra7 32. h6 Rf7 33. Bb2 Kd7 34. Bg7 Nd8 35. h7 Ne6 36. h8Q 1-0

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Kuiphof, Henk"]
[Result "0-1"]
[ECO "A00"]
[PlyCount "58"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. Ng3 Be6 5. Nf3 f6 6. Be2 c5 7. Bb5+ Nd7 8. Qe2 g6 9. a4 Qc7 10. d3 Bg7 11. 0-0 Ne7 12. Nh4 0-0 13. f4 a6 14. Bc4 Bxc4 15. dxc4 exf4 16. Bxf4 Ne5 17. Nh1 N7c6 18. Nf2 Rae8 19. Nd3 Qe7 20. Nxe5 Nxe5 21. g3 Nf7 22. Nf3 g5 23. Bd2 Qxe4 24. Qxe4 Rxe4 25. Ba5 Rfe8 26. Bb6 Bf8 27. Ra3 Re2 28. Rf2 g4 29. Nd2 Ng5 0-1

[Event "Theme 4/5 corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Melchor Munoz, Alejandro"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "37"]
[EventDate "1998.??.??"]
[EventType "tourn (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. d4 fxe4 5. Nxe4 Nf6 6. Nxf6+ gxf6 7. dxe5 dxe5 8. Nd2 Be6 9. Qf3 Bd5 10. Ne4 Be7 11. Be3 c6 12. 0-0-0 Nd7 13. Rxd5 cxd5 14. Qh5+ Kf8 15. Bb5 Nb6 16. Rd1 Kg8 17. Rd3 Bf8 18. Be8 Qe7 19. Bc5 1-0

[Event "Theme 4/5 corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Svendsen, Thomas"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "39"]
[EventDate "1998.??.??"]
[EventType "tourn (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Be2 Ne7 7. Nc3 d5 8. Ne5 c5 9. Nb5 Na6 10. Bg5 Qb6 11. dxc5 Nxc5 12. Nc4 Nd3+ 13. cxd3 dxc4 14. dxc4 Nf5 15. 0-0 e3 16. Qd5 exf2+ 17. Rxf2 Bc5 18. Bh5+ g6 19. Re1+ Kf8 20. Bh6# 1-0

[Event "Theme 4/5 corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Van der Velden, Eddy"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "25"]
[EventDate "1998.??.??"]
[EventType "tourn (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 fxe4 4. Nxe5 Qf6 5. f4 exf3 6. Nxf3 c6 7. d4 d5 8. Be2 Bd6 9. 0-0 Qd8 10. Ng5 Nf6 11. Bh5+ g6 12. Qe2+ Kd7 13. Bg4+ 1-0

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Weiss, Dietmar"]
[Result "1-0"]
[ECO "A00"]
[PlyCount "45"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. f4 exf4 5. Nf3 c5 6. Nxf4 Nc6 7. Bb5 Bd7 8. 0-0 Bd6 9. d3 Ne5 10. Nxe5 Bxe5 11. Qh5 Bxf4 12. Rxf4 Nf6 13. Qxc5 Bxb5 14. Qxb5+ Qd7 15. Qe5+ Qe7 16. Qxd4 0-0 17. Bd2 Rfd8 18. Qf2 a5 19. Rf1 Ra6 20. Bc3 Rc8 21. e5 Nd5 22. Rxf7 Qc5 23. Qxc5 1-0

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Wyder, Bruno"]
[Result "1/2-1/2"]
[ECO "A00"]
[PlyCount "76"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. Nf3 Bd6 5. c3 c5 6. Ng3 Nc6 7. Nh5 g6 8. Ng3 Nf6 9. Bc4 0-0 10. h4 Bg4 11. d3 Qa5 12. Qd2 b5 13. Bd5 Nxd5 14. exd5 Bxf3 15. gxf3 dxc3 16. bxc3 Ne7 17. h5 Nxd5 18. Ne4 Qc7 19. Qh6 f5 20. Ng5 Rf6 21. hxg6 Rxg6 22. Qh3 Qg7 23. Qxf5 h6 24. Qe4 Nb6 25. Nh3 Rc8 26. Be3 c4 27. Bxb6 axb6 28. Kd2 Kh8 29. Rag1 Rxg1 30. Rxg1 Qa7 31. Rg6 Qxa2+ 32. Ke3 Bc5+ 33. d4 exd4+ 34. Kf4 Qd2+ 35. Kg3 Rg8 36. Nf4 dxc3 37. Qe5+ Kh7 38. Qf5 Bxf2+ 1/2-1/2

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Dieu, Bruno"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "A00"]
[PlyCount "73"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. Ng3 c5 5. Nf3 Nc6 6. Bb5 f6 7. 0-0 Qd6 8. d3 Be6 9. Nd2 g6 10. Nc4 Qc7 11. f4 Bg7 12. f5 Bf7 13. b3 a6 14. Bxc6+ Qxc6 15. a4 Ne7 16. Qf3 0-0 17. a5 Nc8 18. Bd2 b5 19. axb6 Nxb6 20. Na5 Qc7 21. h4 Be8 22. fxg6 hxg6 23. h5 g5 24. Nf5 Kh7 25. Nxg7 Qxg7 26. Qf5+ Kh6 27. Nb7 Bd7 28. Qf3 Qe7 29. Ra5 f5 30. Nxc5 f4 31. Bb4 Rfc8 32. Nxd7 Qxb4 33. Qg4 Nxd7 34. Qe6+ Kxh5 35. Qxd7 Rh8 36. Qf7+ Kh4 37. Qf5 1-0

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Kuiphof, Henk"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "A00"]
[PlyCount "61"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 e5 4. Ng3 g6 5. Bc4 Bd6 6. c3 c5 7. d3 Qe7 8. Qb3 Nc6 9. Nf3 Bd7 10. Qxb7 Rb8 11. Qa6 h6 12. 0-0 Rb6 13. Qa4 f5 14. exf5 gxf5 15. Bxg8 Rxg8 16. Bxh6 Bb8 17. Qc2 Nd8 18. cxd4 Nf7 19. Bd2 cxd4 20. Rfe1 Kf8 21. Rac1 Qf6 22. Ba5 Qg6 23. Qc5+ Bd6 24. Bxb6 axb6 25. Qxb6 f4 26. Qb7 fxg3 27. fxg3 Bg4 28. Rf1 Qh5 29. Rc6 Rh8 30. h3 Be6 31. Nd2 1-0

[Event "Theme 4/5 corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Melchor Munoz, Alejandro"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "39"]
[EventDate "1998.??.??"]
[EventType "tourn (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bd6 10. Nexd5 cxd5 11. Nb5 Qd7 12. Re1+ Kd8 13. Bg5+ Be7 14. Qd2 Nc6 15. Qf4 Nh6 16. Rxe7 Nxe7 17. Re1 Re8 18. Nd6 Qc7 19. Rxe7 Qxe7 20. Nxe8 1-0

[Event "Theme 4/5 corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Migala, Andrzej"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "51"]
[EventDate "1998.??.??"]
[EventType "tourn (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nc6 4. Nxc6 dxc6 5. Nc3 Bc5 6. Qh5+ g6 7. Qe2 Ne7 8. g3 Be6 9. Bg2 Qd7 10. 0-0 Bd4 11. d3 0-0-0 12. Re1 Rde8 13. Be3 c5 14. a4 c6 15. a5 b5 16. axb6 axb6 17. Nb5 cxb5 18. exf5 Bd5 19. Bxd4 cxd4 20. Bxd5 Qxd5 21. f6 Nf5 22. Ra8+ Qxa8 23. Qxe8+ Kc7 24. f7 Qa5 25. Re7+ Nxe7 26. Qxh8 1-0

[Event "Theme 4/5 corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Svendsen, Thomas"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "78"]
[EventDate "1998.??.??"]
[EventType "tourn (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qe7 4. Qh5+ g6 5. Nxg6 Qxe4+ 6. Be2 Nf6 7. Qh3 hxg6 8. Qxh8 Qxg2 9. Rf1 Kf7 10. Qh4 Nc6 11. c3 b5 12. d4 Bb7 13. Bg5 Ng4 14. Qg3 Qxg3 15. fxg3 Kg7 16. h3 Nf6 17. Bxb5 Re8+ 18. Kd1 Bd6 19. g4 Ne4 20. Bf4 Rh8 21. d5 Ne7 22. Be3 Rxh3 23. Bd4+ Kh6 24. gxf5 Nxf5 25. Bxd7 Ba6 26. Bxf5 gxf5 27. Re1 Bd3 28. Nd2 Bf4 29. Nxe4 fxe4 30. Bxa7 Rh2 31. Be3 Bxe3 32. Rxe3 Kg5 33. a4 Kf4 34. Re1 Rxb2 35. Rh1 e3 36. Rh4+ Kg3 37. Rd4 Kf2 38. Rf4+ Kg3 39. Rd4 Kf2 1/2-1/2

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Weiss, Dietmar"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "A00"]
[PlyCount "81"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 c5 4. d3 Nc6 5. f4 g6 6. Nf3 Bg7 7. Ng3 Nf6 8. Be2 0-0 9. 0-0 Qc7 10. h3 Bd7 11. Bd2 b5 12. c3 Qb6 13. Kh2 a5 14. Qc1 Ne8 15. Ng5 a4 16. Qd1 a3 17. Qc2 axb2 18. Qxb2 dxc3 19. Bxc3 Nd4 20. e5 f6 21. Nf3 fxe5 22. Nxe5 Be6 23. Bxd4 cxd4 24. Bf3 Rc8 25. Be4 Bxe5 26. fxe5 Rxf1 27. Rxf1 Qc5 28. Qf2 Ng7 29. Re1 Bd5 30. Qb2 e6 31. Re2 Nf5 32. Nxf5 gxf5 33. Bxd5 Qxd5 34. Qd2 Rc7 35. Qg5+ Rg7 36. Qf6 b4 37. Rc2 h5 38. g4 hxg4 39. hxg4 Qd7 40. gxf5 exf5 41. Rg2 1/2-1/2

[Event "corr"]
[Site "corr"]
[Date "1998.??.??"]
[Round "?"]
[White "Wyder, Bruno"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "A00"]
[PlyCount "45"]
[EventDate "1998.??.??"]
[EventType "swiss (corr)"]
[EventRounds "12"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. Nc3 d5 2. e4 d4 3. Nce2 c5 4. Ng3 Nc6 5. Nf3 g6 6. Bc4 Bg7 7. 0-0 a6 8. d3 b5 9. Bd5 Bb7 10. Bxf7+ Kxf7 11. Ng5+ Ke8 12. Ne6 Qd6 13. Nxg7+ Kf8 14. Bf4 Qf6 15. Bg5 Qxg7 16. f4 h6 17. Bh4 Nf6 18. a4 b4 19. Bxf6 exf6 20. e5 f5 21. Qd2 Qf7 22. Rfe1 Qd5 23. a5 0-1

[Event "Latvian gam corr"]
[Site "corr"]
[Date "1997.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Heap, David C"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "34"]
[EventDate "1997.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bd6 10. Re1 Ne7 11. Nc4 dxc4 12. Bxc4 Bxh2+ 13. Kxh2 Qxc4 14. Qh5+ Qf7 15. Qh4 h6 16. Ne4 0-0 17. Nd6 Nf5 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Budovskis, Inesis"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "110"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. exf5 Qe7 5. Qe2 d6 6. Nc4 Bxf5 7. Qxe7+ Bxe7 8. Ne3 Bg6 9. d4 d5 10. Nd2 Nbd7 11. Be2 0-0 12. 0-0 Bd6 13. c4 c6 14. Nf3 Rae8 15. Nh4 Bf7 16. Nhf5 Bc7 17. b3 Be6 18. Bd3 g6 19. Ng3 Rf7 20. Bd2 Nf8 21. Nc2 h5 22. f3 h4 23. Ne2 Nh5 24. Rae1 Ng7 25. Nc3 a6 26. cxd5 cxd5 27. Na4 Bf5 28. Bxf5 Rxe1 29. Rxe1 Nxf5 30. Ne3 Nxd4 31. Nxd5 Bd8 32. Re8 Rd7 33. Nab6 Nxf3+ 34. Kh1 Bxb6 35. Nf6+ Kf7 36. Rxf8+ Kxf8 37. Nxd7+ Ke7 38. gxf3 Kxd7 39. Kg2 Bd8 40. Kh3 Ke6 41. Kg4 b5 42. Bg5 Bc7 43. h3 a5 44. a4 bxa4 45. bxa4 Bb6 46. Bxh4 Bc7 47. Be1 Bd8 48. Kf4 Kd5 49. h4 Kd4 50. Bg3 Bf6 51. Be1 Bd8 52. Bxa5 Bxa5 53. Kg5 Bd8+ 54. Kxg6 Bxh4 55. f4 Kc4 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Clarke, Graham"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "39"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. d4 fxe4 5. Nxe4 Nf6 6. Nxf6+ Qxf6 7. Bg5 Qg6 8. dxe5 Nc6 9. Bb5 Bg4 10. Bxc6+ bxc6 11. exd6 Bxd6 12. Qe2+ Kf8 13. Be3 Qe4 14. 0-0-0 Bxf3 15. gxf3 Qe6 16. Qa6 c5 17. Bxc5 Kf7 18. Bxd6 Rhb8 19. Rhe1 Qh6+ 20. Kb1 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Budovskis, Inesis"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "131"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nc6 4. Nxc6 dxc6 5. Nc3 Bc5 6. d3 Nf6 7. Be2 Bd4 8. 0-0 Bxc3 9. bxc3 fxe4 10. dxe4 Qxd1 11. Bxd1 Be6 12. f3 Bc4 13. Re1 0-0-0 14. Bg5 h6 15. Be3 Rd7 16. Kf2 b6 17. Be2 Be6 18. Ba6+ Kd8 19. a4 Rf8 20. Kg1 g5 21. Rad1 Rxd1 22. Rxd1+ Ke7 23. h4 Rg8 24. hxg5 hxg5 25. Kf2 Kf7 26. Rh1 Kg6 27. Bd4 Nd7 28. g3 Rf8 29. Ke3 Re8 30. f4 c5 31. Bh8 gxf4+ 32. gxf4 Bd5 33. f5+ Kg5 34. Rg1+ Kh6 35. Bg7+ Kh7 36. Rg4 Rxe4+ 37. Rxe4 Bxe4 38. Kxe4 Kxg7 39. Kd5 Kf6 40. Kc6 Ke7 41. Kxc7 Nf6 42. Kb7 Kd6 43. Kxa7 Kc7 44. Be2 Ne4 45. Bf3 Nf6 46. Ka6 Ne8 47. a5 bxa5 48. Kxa5 Nf6 49. Kb5 Kd6 50. Kb6 Ng8 51. Kb7 Ke5 52. Kc6 c4 53. Be2 Ne7+ 54. Kc5 Nxf5 55. Bxc4 Ng3 56. Bd3 Ke6 57. Kc6 Nh5 58. c4 Ng7 59. c5 Ke7 60. Bc4 Kd8 61. Kb7 Ne8 62. Bf7 Nc7 63. c4 Kd7 64. c6+ Kd8 65. Bd5 Ne8 66. Be6 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Clarke, Graham"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "64"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 fxe4 4. Nxe5 Qf6 5. d4 exd3 6. f4 Bb4 7. Bxd3 Bxc3+ 8. bxc3 d6 9. 0-0 dxe5 10. fxe5 Qb6+ 11. Kh1 Ne7 12. Bc4 Be6 13. Qe2 Nd7 14. Bg5 Qc6 15. Bb5 Qc5 16. Bxd7+ Kxd7 17. Rad1+ Kc8 18. Bf6 Nf5 19. Bg5 h6 20. Bc1 Qxc3 21. Qe4 g6 22. Qf4 Qxc2 23. Ba3 Qxa2 24. Bd6 cxd6 25. exd6 Kd7 26. Qe5 Bc4 27. Rxf5 gxf5 28. Qe7+ Kc6 29. Qc7+ Kb5 30. Qxb7+ Kc5 31. Qc7+ Kb4 32. Qb7+ Bb5 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Diepstraten, Leonardus CM"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "61"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bc5 10. Nexd5 cxd5 11. Nxd5 Be6 12. Qe2 Kd8 13. Rd1 Nd7 14. Nf4 Kc8 15. Qxe6 Qxe6 16. Nxe6 Ngf6 17. Nxc5 Nxc5 18. Bf5+ Ncd7 19. Bf4 Re8 20. Rd3 Re7 21. Rad1 Kd8 22. Bg5 Ke8 23. Bxh7 Nf8 24. Bxf6 gxf6 25. Bf5 b6 26. h4 Kf7 27. h5 Kg7 28. Rg3+ Kh6 29. Rd6 Kxh5 30. Rg8 Rb8 31. Rd3 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Downey, Michael S"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "64"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bd6 10. Re1 Ne7 11. Nc4 dxc4 12. Bxc4 Qg6 13. Ne4 Bc7 14. Bg5 Bf5 15. Bxe7 Bxe4 16. f3 Kxe7 17. Rxe4+ Kf8 18. Qe2 Nd7 19. Re1 Nf6 20. Re7 Bb6+ 21. Kh1 Nd5 22. Bxd5 cxd5 23. Re6 Qh5 24. g4 Qf7 25. Re5 g6 26. Re7 Qf4 27. Rxb7 Bc5 28. Qd3 Bd6 29. Re2 Re8 30. Rxa7 Rxe2 31. Qxe2 h5 32. Ra8+ Bb8 0-1

[Event "ICCF theme01 corr"]
[Site "ICCF corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Elburg, John"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "37"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bc5 10. Nexd5 cxd5 11. Nxd5 Be6 12. Qe2 Kd8 13. Rd1 Bd7 14. Bc4 Qf5 15. Bf4 Nf6 16. Nxf6 gxf6 17. Qf3 Qxc2 18. Bxb8 Kc8 19. Rac1 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Elburg, John"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "65"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 e4 4. Nd4 Qf6 5. Nb5 Na6 6. d3 Qxf5 7. N1c3 Bb4 8. dxe4 Qxe4+ 9. Be3 Nf6 10. a3 Bxc3+ 11. Nxc3 Qe6 12. Qd4 c6 13. 0-0-0 d5 14. Bxa6 bxa6 15. Rhe1 0-0 16. Bg5 Qf5 17. Bxf6 Rxf6 18. Rd2 Re6 19. Rde2 Qf7 20. Qc5 Rxe2 21. Rxe2 Bf5 22. Qxc6 Rd8 23. Rd2 Be6 24. Ne2 Bc8 25. Nd4 Re8 26. Nf3 Bb7 27. Qd6 Qe6 28. Qxe6+ Rxe6 29. Nd4 Rg6 30. g3 h5 31. Rd3 h4 32. Rc3 hxg3 33. hxg3 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Evans, Stanley W"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "23"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. d4 d6 4. Bc4 exd4 5. Ng5 Nh6 6. Nxh7 Ng4 7. Ng5 Qf6 8. Bf7+ Kd8 9. Bb3 Rxh2 10. Rxh2 Nxh2 11. Qh5 Ng4 12. Nf7+ 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Gaard, Karl Gustav"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "36"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 Bb4 9. 0-0 Ne7 10. Ne4 d5 11. Ng5 Qf6 12. Ng4 Qd6 13. Qe2 h6 14. Nh7 Qe6 15. Ngf6+ gxf6 16. Qh5+ Kd8 17. c3 Bd6 18. Qxh6 f5 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Grobe, Ernst"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "20"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. d4 fxe4 4. Nxe5 Nf6 5. Bc4 d5 6. Bb3 Bd6 7. Bg5 c6 8. Nc3 Qe7 9. Ng4 Bxg4 10. Bxf6 Qe6 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Jackson, James Andrew"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "95"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 d5 5. Qh5+ g6 6. Nxg6 Nf6 7. Qe5+ Be7 8. Bb5+ c6 9. Nxe7 Qxe7 10. Qxe7+ Kxe7 11. Be2 Rg8 12. g3 Bf5 13. d4 exd3 14. Bxd3 Bxd3 15. cxd3 c5 16. Nd2 Nc6 17. Nf3 Nb4 18. Kd2 Ng4 19. a3 Nc6 20. Re1+ Kd6 21. Ke2 Rgf8 22. Bf4+ Kd7 23. Rac1 Rae8+ 24. Kf1 Rxe1+ 25. Rxe1 Re8 26. Rxe8 Kxe8 27. h3 Nf6 28. Bd6 b6 29. Ne5 Nxe5 30. Bxe5 Nd7 31. Bc7 Kf7 32. Ke2 Ke6 33. f4 b5 34. g4 d4 35. b3 Kd5 36. f5 c4 37. bxc4+ bxc4 38. dxc4+ Kxc4 39. g5 Kc3 40. g6 hxg6 41. fxg6 Kc2 42. Bf4 d3+ 43. Ke1 Nf6 44. g7 Ng8 45. h4 Nf6 46. h5 Ng8 47. h6 Nf6 48. h7 1-0

[Event "ICCF theme01 corr"]
[Site "ICCF corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Keller, Samuel"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "37"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bc5 10. Nexd5 cxd5 11. Nxd5 Nc6 12. Nc7+ Qxc7 13. Qh5+ Qf7 14. Qxc5 Nf6 15. Re1+ Kd8 16. Bg5 Re8 17. Bc4 Qf8 18. Rad1+ Bd7 19. Rxd7+ 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Kozlov, Vladimir F"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "48"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bd6 10. Re1 Ne7 11. Nc4 dxc4 12. Bxc4 Qg6 13. Ne4 Bc7 14. Bg5 Bf5 15. Bxe7 Bxe4 16. Bg5 Nd7 17. Qf3 Nc5 18. Rad1 Rf8 19. Qe3 Rf5 20. h4 Bf4 21. Qd4 Bxg5 22. hxg5 Rxg5 23. Kf1 Kf8 24. f3 b5 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Krantz, Kjell Erik"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "53"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qg6 6. d3 Bb4 7. Bd2 Bxc3 8. Bxc3 Nf6 9. Bxf6 Qxf6 10. dxe4 0-0 11. Qd5+ Kh8 12. 0-0-0 Nc6 13. e5 Qxf2 14. Bd3 Nb4 15. Qe4 Nxd3+ 16. Qxd3 b6 17. Rhf1 Qc5 18. Rxf8+ Qxf8 19. Rf1 Qe8 20. e6 dxe6 21. Ne5 Bb7 22. Rf7 Rc8 23. Qg3 Qg8 24. Rf4 Qe8 25. Nf7+ Kg8 26. Nh6+ Kh8 27. Rf7 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Lagunov, Anatoly Viktorovich"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "37"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Be2 Qd8 7. 0-0 Nf6 8. Bg5 Bf5 9. f3 Be7 10. Nc3 d5 11. Ne3 Be6 12. Bxf6 Bxf6 13. fxe4 dxe4 14. d5 Bxc3 15. bxc3 Bf7 16. Rxf7 Kxf7 17. d6 Qxd6 18. Bc4+ Ke7 19. Nf5+ 1-0

[Event "ICCF theme01 corr"]
[Site "ICCF corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Malmstroem, Jan"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "38"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 d6 4. d4 e4 5. Ng5 Bxf5 6. Nc3 d5 7. f3 Bb4 8. fxe4 Bg6 9. e5 h6 10. Ne6 Qh4+ 11. g3 Qe4+ 12. Kf2 Qf5+ 13. Nf4 Bxc3 14. Bd3 Bxd4+ 15. Kg2 Bh5 16. Nxh5 Qf2+ 17. Kh3 Qf7 18. Qg4 Kd8 19. Rf1 Qe7 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Malmstroem, Jan"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "59"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 Qg5 5. d4 Qxg2 6. Qh5+ g6 7. Bf7+ Kd8 8. Bxg6 Qxh1+ 9. Ke2 c6 10. Nc3 e3 11. Nf7+ Kc7 12. Bxe3 Qxa1 13. Qg5 Be7 14. Bf4+ Kb6 15. Na4+ Ka6 16. Nc5+ Kb6 17. Qg3 d6 18. Bxd6 Bxd6 19. Nxd6 Bg4+ 20. Qxg4 Nf6 21. Nc8+ Kc7 22. Qf4+ Kxc8 23. Qxf6 Re8+ 24. Bxe8 Qxb2 25. Qf5+ Kd8 26. Bh5 Qb5+ 27. Kf3 Kc7 28. Qxh7+ Kb6 29. Qxb7+ Ka5 30. Qxa8 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Melchor Munoz, Alejandro"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "34"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 e4 4. Ne5 Nf6 5. Be2 d6 6. Ng4 Bxf5 7. Ne3 Bg6 8. d4 exd3 9. Bxd3 Bxd3 10. Qxd3 Nc6 11. Nc3 Be7 12. Ned5 0-0 13. 0-0 Rf7 14. Nxe7+ Qxe7 15. Bg5 Qe5 16. Bxf6 Qxf6 17. Rae1 Raf8 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Niemand, Gerhard"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "91"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 e4 4. Qe2 d5 5. d3 Bxf5 6. dxe4 Bxe4 7. Ng5 Qe7 8. Nc3 Nc6 9. Ngxe4 dxe4 10. Qxe4 Qxe4+ 11. Nxe4 0-0-0 12. Bd2 Re8 13. f3 Nf6 14. Bd3 Nb4 15. 0-0 Nxd3 16. cxd3 Rd8 17. Nxf6 Bc5+ 18. Kh1 gxf6 19. Rac1 Rxd3 20. Rxc5 Rxd2 21. Rfc1 c6 22. R5c2 Rhd8 23. h3 Kc7 24. Kg1 Kb6 25. Kf1 f5 26. Ke1 R2d3 27. Re2 R8d4 28. Rcc2 Ra4 29. a3 Rad4 30. Re7 Rd7 31. Rxd7 Rxd7 32. g4 Rd6 33. gxf5 Rf6 34. Kf2 Rxf5 35. Kg3 h5 36. f4 Kc7 37. Kf3 Kd6 38. Ke4 Ke6 39. Rg2 Kf6 40. h4 Rb5 41. b4 Rd5 42. Rg5 Rd1 43. Rxh5 Re1+ 44. Kd4 Rd1+ 45. Kc4 Rf1 46. Rh7 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Oren, Itamar"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "55"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 e4 4. Qe2 Qe7 5. Nd4 Nc6 6. Nb5 d5 7. d4 Bxf5 8. Bf4 Rc8 9. N1c3 Nf6 10. 0-0-0 a6 11. Na3 Qb4 12. Be5 Qa5 13. Nab1 Rd8 14. f3 Be7 15. Nd2 0-0 16. Nb3 Qb6 17. Qd2 exf3 18. gxf3 Nb4 19. Na1 Qa5 20. Kb1 b5 21. Rg1 c5 22. Qf4 Ne8 23. Qh6 Bg6 24. Rxg6 hxg6 25. Qxg6 Nf6 26. Bh3 Qb6 27. a3 c4 28. Ne2 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Pape, Joerg"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "75"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 Nf6 4. Bc4 fxe4 5. Nxe5 d5 6. Nxd5 Be6 7. Nxf6+ Qxf6 8. Bxe6 Qxe6 9. d4 exd3 10. 0-0 Bd6 11. Nf3 dxc2 12. Qxc2 0-0 13. Qxh7+ Kxh7 14. Ng5+ Kg6 15. Nxe6 Rf6 16. Ng5 Nc6 17. Ne4 Re6 18. Nxd6 cxd6 19. Bd2 d5 20. Rfe1 Rae8 21. Rxe6+ Rxe6 22. Kf1 Kf5 23. Re1 Re4 24. Rxe4 Kxe4 25. Ke2 Nd4+ 26. Kd1 Kd3 27. h4 b5 28. h5 Nc6 29. f4 Nd8 30. Bc3 d4 31. Bb4 Ne6 32. f5 Nf4 33. g4 Nd5 34. Bf8 Ne3+ 35. Kc1 Ke2 36. Bc5 Nc2 37. Bxd4 Nxd4 38. f6 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Reinke, Robert T"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "51"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 Qf7 5. Ne3 fxe4 6. Bc4 Qg6 7. d4 Nf6 8. 0-0 c6 9. f4 d5 10. Be2 h5 11. c4 dxc4 12. Bxc4 Nbd7 13. f5 Qh7 14. Qb3 Bd6 15. Bf7+ Kd8 16. Nc4 Bc7 17. Bg5 Rf8 18. Ne3 Bb6 19. Nc3 Bxd4 20. Rad1 Bxe3+ 21. Bxe3 b6 22. Bf4 Ba6 23. Qe6 Bxf1 24. Kxf1 e3 25. Ne4 Nxe4 26. Qxd7# 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Senechaud, Danny"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "110"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 fxe4 4. Nxe5 g6 5. Bc4 Qg5 6. Bf7+ Kd8 7. d4 Qxg2 8. Rf1 Bb4 9. Bb3 Nf6 10. Nf7+ Ke7 11. Nxh8 d5 12. Bd2 Bxc3 13. bxc3 Bh3 14. Qe2 Qxf1+ 15. Qxf1 Bxf1 16. Kxf1 Nbd7 17. Nxg6+ hxg6 18. c4 c6 19. Bg5 Ke6 20. cxd5+ cxd5 21. c4 dxc4 22. Bxc4+ Kf5 23. h4 Nb6 24. Bb3 Rd8 25. Rd1 Rd6 26. Bxf6 Rxf6 27. Ke2 Rd6 28. Ke3 Rd7 29. Rg1 Nc8 30. Rg5+ Kf6 31. Kxe4 Nd6+ 32. Kd3 Nf5 33. Rg4 Rh7 34. Re4 Nxh4 35. Re6+ Kf5 36. d5 g5 37. Kd4 Rc7 38. d6 Nf3+ 39. Kd5 Rc3 40. Re7 Rd3+ 41. Kc5 b6+ 42. Kc6 Nd4+ 43. Kd7 Nxb3 44. axb3 Rxb3 45. Re3 Rb2 46. Rf3+ Ke4 47. Rf6 Rd2 48. Ke7 b5 49. d7 Rxd7+ 50. Kxd7 b4 51. Ra6 Kf3 52. Ra2 b3 53. Rb2 a5 54. Ke6 a4 55. Kf5 g4 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Sireta, Bertrand"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "80"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bc5 10. Nexd5 cxd5 11. Nxd5 Nc6 12. Bf4 Kf8 13. Bc4 Be6 14. Bg5 Nd4 15. b4 Nf6 16. bxc5 Bxd5 17. Qxd4 Bxc4 18. Rfe1 Kg8 19. Rad1 Bxa2 20. Qd6 Nd5 21. Ra1 Bc4 22. Rxa7 Rxa7 23. Qb8+ Qf8 24. Qxa7 h6 25. Bc1 Qc8 26. Qa4 Qxc5 27. Qe8+ Kh7 28. Qe4+ g6 29. Qe6 Qc7 30. Re4 Rf8 31. Ba3 Rf4 32. Bb2 Rxe4 33. Qxe4 Nf4 34. h4 Ne2+ 35. Kh1 Qd7 36. Kh2 Qf7 37. h5 Qf4+ 38. Qxf4 Nxf4 39. hxg6+ Kxg6 40. g3 Nd5 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Stamer, Wolfgang"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "31"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 Nf6 4. Bc4 fxe4 5. Nxe5 Qe7 6. d4 c6 7. Bg5 d5 8. Bxd5 cxd5 9. Nxd5 Nxd5 10. Bxe7 Nxe7 11. Qe2 Nbc6 12. Nc4 Nxd4 13. Qxe4 Ndf5 14. g4 Nh6 15. Nd6+ Kd7 16. 0-0-0 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Stummer, Kurt"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "73"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. d4 fxe4 4. Nxe5 Nf6 5. Be2 d6 6. Ng4 Be7 7. Nc3 Bf5 8. Nxf6+ Bxf6 9. Nd5 0-0 10. c3 c6 11. Ne3 Be6 12. d5 Bc8 13. 0-0 Bh4 14. Bg4 c5 15. Be6+ Bxe6 16. dxe6 Nc6 17. Qd5 Qf6 18. f4 Rae8 19. g3 Qxe6 20. gxh4 Qxd5 21. Nxd5 Re6 22. Be3 Rg6+ 23. Kh1 Rh6 24. Rad1 Rxh4 25. Nc7 Ne7 26. Ne6 Re8 27. f5 Nxf5 28. Rxf5 Rxe6 29. Rfd5 b6 30. Rxd6 Rxd6 31. Rxd6 Rh3 32. Bf2 Rd3 33. Rxd3 exd3 34. Be3 c4 35. b3 b5 36. bxc4 bxc4 37. Kg2 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Svendsen, Thomas"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "35"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. d4 exd4 5. Nxd4 fxe4 6. Nxe4 Be7 7. Bc4 c6 8. 0-0 d5 9. Qh5+ Kf8 10. Ng5 Bxg5 11. Bxg5 Nf6 12. Qh4 dxc4 13. Rad1 Qe7 14. Rfe1 Qf7 15. Nb5 Nbd7 16. Nc7 Rb8 17. Bxf6 gxf6 18. Qh6+ 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Vitols, Karlis"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "45"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Be6 10. Re1 Ne7 11. Ne2 Nd7 12. Nd4 0-0-0 13. Ng4 Nc5 14. Nxe6 Nxe6 15. Ne5 Qf6 16. Qg4 h5 17. Qh3 Kc7 18. Nxc6 bxc6 19. Rxe6 Qd4 20. Bg5 Qc5 21. Qg3+ Kb7 22. Bxe7 Bxe7 23. Qxg7 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Diepstraten, Leonardus CM"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C41"]
[PlyCount "82"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. d4 fxe4 5. Nxe4 Nf6 6. Qd3 Nc6 7. dxe5 dxe5 8. Qxd8+ Nxd8 9. Nxf6+ gxf6 10. Bc4 Be6 11. Bb5+ c6 12. Bd3 Bc5 13. 0-0 Nf7 14. Be3 Bxe3 15. fxe3 Ke7 16. Nh4 Nd6 17. e4 Rhg8 18. Nf5+ Nxf5 19. exf5 Bd5 20. g3 b5 21. b3 b4 22. Rae1 Rg4 23. Re3 Rag8 24. a3 a5 25. axb4 axb4 26. Kf2 Ra8 27. h3 Rgg8 28. g4 Kd6 29. Rc1 h5 30. Kg3 hxg4 31. hxg4 Rg7 32. Be2 Rh8 33. c4 bxc3 34. Rexc3 Rgh7 35. Kf2 Rh2+ 36. Ke3 R8h3+ 37. Kd2 Bf3 38. Rd3+ Ke7 39. Re1 Bxg4 40. Rxh3 Bxh3 41. Kc1 Bxf5 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Downey, Michael S"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "40"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. Bc4 Qe7 5. d4 fxe4 6. Bg5 c6 7. Nc3 d6 8. Nf7 d5 9. Nxh8 dxc4 10. 0-0 Bg4 11. Bxf6 Bxd1 12. Bxe7 Bxc2 13. Bxf8 Kxf8 14. f3 e3 15. Rfe1 Nd7 16. Rxe3 Nf6 17. Rae1 b5 18. g4 b4 19. g5 Ne8 20. Ne4 Kg8 1-0

[Event "ICCF theme01 corr"]
[Site "ICCF corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Elburg, John"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "60"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. exf5 Qe7 5. Qe2 d6 6. Nc4 Bxf5 7. Qxe7+ Bxe7 8. Ne3 Bg6 9. d4 d5 10. c3 0-0 11. Be2 Bd6 12. 0-0 c6 13. b3 Re8 14. Na3 a6 15. Bf3 Nbd7 16. Bb2 Ne4 17. Bxe4 Bxe4 18. Rfe1 Re7 19. f3 Bg6 20. Nec2 Rae8 21. Rxe7 Rxe7 22. Re1 Rxe1+ 23. Nxe1 Bxa3 24. Bxa3 Bb1 25. Bd6 Bxa2 26. b4 Nb6 27. Nd3 Nc4 28. Bb8 b6 29. Ne5 a5 30. Nxc4 Bxc4 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Elburg, John"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "66"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Be2 Qd8 7. 0-0 Be7 8. d5 Bf5 9. Ne3 Bg6 10. c4 Nf6 11. Nc3 Nbd7 12. f3 exf3 13. Bxf3 Ne5 14. Bg4 Nexg4 15. Nxg4 Nxg4 16. Qxg4 Qd7 17. Qg3 0-0-0 18. Be3 a6 19. Bd4 Rhg8 20. Rad1 Rde8 21. b4 Bf6 22. Bxf6 gxf6 23. Qf2 Be4 24. g3 Qh3 25. Nxe4 Rxe4 26. Rc1 Kb8 27. Qg2 Qg4 28. Rxf6 Re2 29. Rf2 Rge8 30. Qf3 Re1+ 31. Rxe1 Rxe1+ 32. Kg2 Qxc4 33. a3 Re5 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Evans, Stanley W"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "44"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 e4 4. Ne5 Nf6 5. Be2 d5 6. Bh5+ Ke7 7. Nf7 Qe8 8. Nxh8 Qxh5 9. Qxh5 Nxh5 10. g4 Nf6 11. h3 Nc6 12. Na3 Ne5 13. b3 g6 14. fxg6 Bg7 15. Nf7 Nf3+ 16. Kf1 hxg6 17. g5 Nh5 18. Rb1 Kxf7 19. h4 Nf4 20. d3 Bh3+ 21. Rxh3 Nxh3 22. Kg2 Nhg1 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Gaard, Karl Gustav"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "79"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 Nf6 4. exf5 e4 5. Ng5 d5 6. d3 Bxf5 7. dxe4 Bxe4 8. Ngxe4 dxe4 9. Qxd8+ Kxd8 10. Bg5 Nbd7 11. Nxe4 Bb4+ 12. c3 Re8 13. f3 Be7 14. Bd3 h6 15. Bh4 Nd5 16. Bxe7+ Rxe7 17. 0-0-0 Ke8 18. Rhe1 Kf8 19. Bf1 N5b6 20. Ng3 Rae8 21. Rxe7 Rxe7 22. Kd2 Ne5 23. b3 Rd7+ 24. Kc1 Re7 25. a4 a5 26. Rd8+ Kf7 27. Nf5 Re6 28. Kd2 Nc6 29. Rd3 Ne5 30. Re3 Kf6 31. Nd4 Rd6 32. Kc2 Nd5 33. Re1 c6 34. h3 g5 35. Re4 Ng6 36. Ne2 Nh4 37. Ng3 Rd8 38. Nh5+ Kg6 39. Bd3 Kf7 40. Bf1 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Grobe, Ernst"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "43"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. Bc4 Qe7 5. d4 fxe4 6. Bg5 c6 7. Bf7+ Kd8 8. Bh5 g6 9. Be2 d5 10. 0-0 Nbd7 11. f4 Bg7 12. c4 Nb6 13. Nc3 Ke8 14. cxd5 cxd5 15. Rc1 a6 16. Qb3 Qd6 17. a4 Nbd7 18. a5 Rb8 19. Na4 Kf8 20. Rc3 Ng8 21. Bd8 Qe6 22. Bg4 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Heap, David C"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "89"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Nc3 Qg6 7. f3 exf3 8. Qxf3 Nc6 9. d5 Nb4 10. Ne3 Nf6 11. a3 Na6 12. Bd3 Qh5 13. Bxa6 bxa6 14. Qxh5+ Nxh5 15. 0-0 Bb7 16. Nc4 Be7 17. Na5 Rb8 18. Be3 Ba8 19. Rae1 Rxb2 20. Bg5 Nf6 21. Rxf6 gxf6 22. Bxf6 0-0 23. Bxe7 Re8 24. Re2 Kf7 25. Nc4 Rbb8 26. Bh4 Rxe2 27. Nxe2 Bxd5 28. Ne3 Be4 29. Nc3 Bg6 30. Ncd5 c6 31. Nb4 c5 32. Nbd5 Rb1+ 33. Kf2 Rb2 34. Bg3 Bxc2 35. Nc4 Rb3 36. Bxd6 Bd3 37. Nce3 Rxa3 38. Bxc5 Ra1 39. Bxa7 a5 40. Bd4 Ra2+ 41. Kf3 Bb5 42. Ke4 Bc6 43. Ke5 Bxd5 44. Kxd5 a4 45. Bc5 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Jackson, James Andrew"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C41"]
[PlyCount "64"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 d6 4. d4 e4 5. Ng5 Bxf5 6. Qe2 d5 7. Qb5+ Nc6 8. Qxb7 Nxd4 9. Bb5+ Nxb5 10. Qxb5+ Qd7 11. Nc3 c6 12. Qe2 Nf6 13. f3 Bb4 14. 0-0 0-0 15. fxe4 Bc5+ 16. Kh1 Nxe4 17. Ngxe4 Bxe4 18. Rxf8+ Rxf8 19. Nxe4 Qg4 20. Qe1 Qxe4 21. Bd2 Qg6 22. Qg3 Qxc2 23. Qc3 Qxc3 24. Bxc3 Be3 25. g3 d4 26. Be1 Rf1+ 27. Kg2 Rg1+ 28. Kf3 Bd2 29. Ke2 Ba5 30. Rd1 d3+ 31. Kf2 Bb6+ 32. Kf3 d2 0-1

[Event "ICCF theme01 corr"]
[Site "ICCF corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Keller, Samuel"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "42"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. Nc4 fxe4 5. Nc3 d5 6. Na3 c6 7. d4 b5 8. Nab1 Bd6 9. Be3 Ng4 10. Ne2 0-0 11. Nc1 a5 12. Be2 Nxe3 13. fxe3 Qg5 14. Qd2 c5 15. c3 cxd4 16. cxd4 b4 17. Rg1 Ba6 18. Kd1 Ra7 19. g4 Bxe2+ 20. Nxe2 Raf7 21. Nf4 Bxf4 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Kozlov, Vladimir F"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "60"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 Nf6 4. Nxe5 Qe7 5. Qe2 d6 6. Nc4 Bxf5 7. Qxe7+ Bxe7 8. Ne3 Bg6 9. d4 d5 10. Bb5+ c6 11. Ba4 0-0 12. c3 Nbd7 13. Bc2 Bxc2 14. Nxc2 Bd6 15. 0-0 Rae8 16. Be3 Ng4 17. g3 h5 18. Nd2 h4 19. Rae1 hxg3 20. hxg3 Re6 21. Bg5 Rxe1 22. Nxe1 Re8 23. Nd3 Kf7 24. f3 Ngf6 25. f4 Re2 26. Ne5+ Ke8 27. Rf2 Re1+ 28. Kg2 Nb6 29. Bxf6 gxf6 30. Nd3 Ra1 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Krantz, Kjell Erik"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "47"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. d4 fxe4 5. Nxe4 Nf6 6. Nxf6+ Qxf6 7. Bg5 Qe6 8. dxe5 Nd7 9. Bd3 dxe5 10. 0-0 Bd6 11. Qe2 Qg4 12. h3 Qh5 13. Bc4 h6 14. Bh4 g5 15. g4 Qg6 16. Bg3 e4 17. Rfe1 Nf6 18. Rad1 Bxg3 19. fxg3 Qg7 20. Ne5 Qe7 21. Bf7+ Kf8 22. Ng6+ Kxf7 23. Nxe7 Kxe7 24. Qb5 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Lagunov, Anatoly Viktorovich"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "34"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Be6 10. Re1 Ne7 11. Ng4 Nd7 12. Ne5 Nxe5 13. Rxe5 Ng6 14. Bxg6 hxg6 15. Bg5 Bd6 16. Re2 Bxh2+ 17. Kf1 Bf4 1/2-1/2

[Event "ICCF theme01 corr"]
[Site "ICCF corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Malmstroem, Jan"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "51"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Nc3 Qg6 7. f3 exf3 8. Qxf3 Nf6 9. Bd3 Qf7 10. Bg5 Be7 11. Nb5 Na6 12. 0-0 0-0 13. Rae1 Bd7 14. Nbxd6 cxd6 15. Qxb7 Rab8 16. Qxa6 Qd5 17. Rxe7 Qxg5 18. Qxd6 Rbd8 19. Ne5 Qe3+ 20. Kh1 Ne4 21. Qd5+ Kh8 22. Rxf8+ Rxf8 23. Nf7+ Kg8 24. Nh6+ Kh8 25. Qg8+ Rxg8 26. Nf7# 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Malmstroem, Jan"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C41"]
[PlyCount "88"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. d4 fxe4 5. Nxe4 d5 6. Nxe5 dxe4 7. Qh5+ g6 8. Nxg6 hxg6 9. Qxg6+ Kd7 10. Qf5+ Ke8 11. Qe5+ Qe7 12. Qxh8 Be6 13. Qe5 Bg7 14. Qxe4 Nf6 15. Qe2 Nc6 16. c3 Kf8 17. Be3 Re8 18. Qd3 Bd5 19. Qf5 Be4 20. Qf4 Qe6 21. h3 Ne7 22. Qxc7 Nfd5 23. Qc5 Rc8 24. Qxa7 Nxe3 25. fxe3 Bxg2 26. d5 Bxd5 27. Rh2 Bh6 28. Re2 Be4 29. Rd1 Nf5 30. Qa3+ Kg7 31. Qa4 Rc7 32. Bg2 Bxg2 33. Qg4+ Kh7 34. e4 Rg7 35. exf5 Qc6 36. Re6 Rxg4 37. Rxc6 Re4+ 38. Kf2 bxc6 39. Kxg2 Re2+ 40. Kg3 Rxb2 41. Rd7+ Kg8 42. Rd6 Kg7 43. Rg6+ Kh7 44. Rxc6 Rxa2 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Melchor Munoz, Alejandro"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "25"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. d4 fxe4 5. Bg5 d6 6. Nc3 Bf5 7. Bc4 dxe5 8. dxe5 Qxd1+ 9. Rxd1 h6 10. exf6 hxg5 11. Nd5 Na6 12. Bxa6 0-0-0 13. fxg7 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Niemand, Gerhard"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "78"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. exf5 Bxf5 5. d4 Nd7 6. dxe5 Nxe5 7. Nxe5 dxe5 8. Qf3 Bxc2 9. Qxb7 Nf6 10. Bb5+ Kf7 11. Bc4+ Kg6 12. Qf3 h6 13. 0-0 Bd6 14. Be3 Bf5 15. h3 e4 16. Qe2 h5 17. Nb5 Be5 18. Nxa7 Ng4 19. hxg4 Bh2+ 20. Kxh2 Qh4+ 21. Kg1 hxg4 22. f3 g3 23. Bf7+ Kxf7 24. Qc4+ Kg6 25. Qc6+ Kh7 26. Rf2 Qh2+ 27. Kf1 Qh1+ 28. Ke2 Qxa1 29. Qb5 Bg6 30. Rf1 Qxa2 31. Nc6 Rhe8 32. f4 Bf7 33. Rc1 Ra3 34. Bd4 Rb3 35. Nb4 Rxb2+ 36. Bxb2 Qxb2+ 37. Rc2 Qb3 38. Rxc7 Rd8 39. Rc1 Qb2+ 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Oren, Itamar"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "75"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 Nf6 4. exf5 e4 5. Ng5 d5 6. d3 Bxf5 7. dxe4 Bxe4 8. Ngxe4 dxe4 9. Qxd8+ Kxd8 10. Bg5 Nbd7 11. Nxe4 Bb4+ 12. c3 Re8 13. Bd3 Be7 14. Bxf6 Nxf6 15. 0-0-0 Nxe4 16. Bxe4+ Bd6 17. Bxb7 Rb8 18. Bf3 Re5 19. Rhe1 Ke7 20. Be4 Kf6 21. g3 Rbe8 22. f3 g5 23. Re2 h5 24. Rde1 h4 25. gxh4 gxh4 26. Kd2 Rg5 27. Bc6 Rxe2+ 28. Rxe2 h3 29. Bd7 Bf4+ 30. Kc2 Rg2 31. Kd3 Rxe2 32. Kxe2 Ke5 33. Bxh3 Bxh2 34. Kd3 Kd5 35. b4 Bg3 36. c4+ Ke5 37. a4 Be1 38. b5 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Pape, Joerg"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "40"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nc6 4. Nxc6 dxc6 5. Nc3 Nf6 6. exf5 Bxf5 7. d4 Qd7 8. Bd3 0-0-0 9. Ne2 Bd6 10. Bg5 c5 11. Bxf6 gxf6 12. c3 cxd4 13. Bxf5 Qxf5 14. Nxd4 Rhe8+ 15. Kf1 Qg6 16. Qf3 Bc5 17. Rd1 Bxd4 18. cxd4 Qc2 19. b3 Qxa2 20. g3 Qb2 1/2-1/2

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Reinke, Robert T"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "50"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. exf5 e4 4. Qe2 Qe7 5. Nd4 d5 6. Qh5+ Kd8 7. Qh3 Nc6 8. Nxc6+ bxc6 9. Be2 g6 10. Qc3 Nf6 11. Qxc6 Rb8 12. Nc3 Qe5 13. fxg6 hxg6 14. Nb5 Rxb5 15. Bxb5 Bd6 16. h3 Ng4 17. Rf1 Nh2 18. Qc3 d4 19. Qc4 Be6 20. Qc6 Nxf1 21. Bxf1 Rf8 22. Qb5 Bc5 23. b4 Qf4 24. g3 Qxf2+ 25. Kd1 Qg1 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Senechaud, Danny"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "107"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3 Qf7 6. Ne3 c6 7. d3 exd3 8. Bxd3 d5 9. 0-0 Bc5 10. Na4 Bd6 11. c4 Be6 12. cxd5 cxd5 13. Nc3 Ne7 14. Nb5 Nc8 15. f4 0-0 16. Qc2 Qh5 17. Nxd6 Nxd6 18. f5 Rc8 19. Qa4 Bf7 20. Qf4 Ne8 21. Ng4 Nd7 22. Bd2 Nef6 23. h3 Be8 24. Rae1 Qf7 25. b4 a5 26. a3 axb4 27. axb4 h5 28. Nh2 Ra3 29. Rf3 Nf8 30. g4 Ra2 31. Bb1 Rc4 32. Bxa2 Rxf4 33. Bxf4 Bc6 34. Rfe3 Qd7 35. Re7 Qd8 36. g5 Qb6+ 37. Kg2 Qxb4 38. Bc1 N6h7 39. Nf3 Qc3 40. R7e2 Qd3 41. Bb2 Kh8 42. Bb1 Qc4 43. g6 Nf6 44. Ne5 d4+ 45. Kh2 Qd5 46. Ba3 N6d7 47. Bxf8 Nxf8 48. Nxc6 bxc6 49. Re8 Qd6+ 50. R1e5 h4 51. Bd3 Qb4 52. Kg1 Qd6 53. Kf2 c5 54. Ke2 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Sireta, Bertrand"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C40"]
[PlyCount "52"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. d4 fxe4 4. Nxe5 Nf6 5. Bg5 d6 6. Nd2 dxe5 7. dxe5 Qd5 8. exf6 Qxg5 9. Nxe4 Qe5 10. f7+ Kxf7 11. Bc4+ Be6 12. Qf3+ Kg8 13. Qd3 Nc6 14. f4 Bb4+ 15. c3 Qf5 16. cxb4 Rd8 17. Qe2 Nd4 18. Rd1 Kf8 19. Bxe6 Qxe6 20. Kf2 Nxe2 21. Rxd8+ Ke7 22. Rxh8 Nxf4 23. Nc5 Nd3+ 24. Kf3 Ne5+ 25. Kf2 Qf5+ 26. Ke3 Qd3+ 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Stamer, Wolfgang"]
[Black "De Jong, Siebert FJ"]
[Result "0-1"]
[ECO "C41"]
[PlyCount "42"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nc3 d6 4. d4 fxe4 5. Nxe4 Nf6 6. Nxf6+ Qxf6 7. Bg5 Qg6 8. dxe5 Nc6 9. exd6 Bxd6 10. Bc4 Bg4 11. Qe2+ Kd7 12. Be3 Rae8 13. 0-0-0 Qe4 14. Bd5 Qg6 15. Qb5 Kc8 16. Bxc6 bxc6 17. Qxc6 Rhf8 18. Qa6+ Kd7 19. Bf4 Rxf4 20. Qxa7 Bxf3 21. gxf3 Re2 0-1

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Stummer, Kurt"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "23"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 Qg5 5. d4 Qxg2 6. Qh5+ g6 7. Bf7+ Kd8 8. Bxg6 Qxh1+ 9. Ke2 Bg7 10. Bg5+ Nf6 11. Qh6 Qg2 12. Qxg7 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Svendsen, Thomas"]
[Black "De Jong, Siebert FJ"]
[Result "1-0"]
[ECO "C40"]
[PlyCount "91"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nc6 4. Qh5+ g6 5. Nxg6 Nf6 6. Qh4 hxg6 7. Qxh8 Qe7 8. d3 Nd4 9. Bg5 Kf7 10. Qxf6+ Qxf6 11. Bxf6 Kxf6 12. Kd1 b6 13. c3 Ne6 14. Nd2 Bb7 15. Be2 Re8 16. g3 Bh6 17. f4 d6 18. Re1 Nc5 19. exf5 gxf5 20. d4 Ne4 21. Bf3 d5 22. Nf1 Bf8 23. Kc2 Bd6 24. b3 Rh8 25. Re2 Ba6 26. Rg2 Bxf1 27. Rxf1 Rh3 28. c4 c6 29. Kd3 Ke6 30. cxd5+ cxd5 31. Ke3 Nf6 32. Re2 Kd7 33. Rh1 a5 34. Bg2 Rh8 35. h3 Rg8 36. Kf2 a4 37. bxa4 Ra8 38. Bf3 Rxa4 39. Rd1 Ne4+ 40. Bxe4 dxe4 41. h4 Ke6 42. h5 b5 43. h6 Ra7 44. d5+ Kf6 45. Rc2 b4 46. Rh1 1-0

[Event "WK1 Latvian gam corr9498"]
[Site "corr"]
[Date "1994.??.??"]
[Round "?"]
[White "Vitols, Karlis"]
[Black "De Jong, Siebert FJ"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "41"]
[EventDate "1994.??.??"]
[EventType "tourn (corr)"]
[EventRounds "50"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. exf5 Qe7 5. Qe2 d6 6. Nc4 Bxf5 7. Qxe7+ Bxe7 8. Ne3 Bg6 9. d4 d5 10. c4 Nc6 11. Nc3 Nxd4 12. cxd5 0-0-0 13. Bc4 a6 14. 0-0 b5 15. Bb3 b4 16. Ncd1 Nxb3 17. axb3 Kb7 18. Re1 Nxd5 19. Nxd5 Rxd5 20. Ne3 Re5 21. Bd2 1/2-1/2

[Event "NED corr"]
[Site "Netherlands"]
[Date "1982.??.??"]
[Round "?"]
[White "De Jong, Siebert FJ"]
[Black "Fiorito, Mario V"]
[Result "1/2-1/2"]
[ECO "C40"]
[PlyCount "38"]
[EventDate "1982.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "NED"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 f5 3. d4 fxe4 4. Bg5 Be7 5. Bxe7 Qxe7 6. Nxe5 Nf6 7. Nc3 d5 8. Be2 0-0 9. 0-0 b6 10. f4 exf3 11. Bxf3 c6 12. Qd2 Qd6 13. Rae1 Ba6 14. Be2 Bxe2 15. Rxe2 Nbd7 16. Nxd7 Nxd7 17. Rfe1 Rf6 18. Nd1 Raf8 19. Rf2 h6 1/2-1/2

