[Event "BEL-chT 9900"]
[Site "Antwerp"]
[Date "1999.10.??"]
[Round "2"]
[White "Koster, Leon"]
[Black "Kohlweyer, Bernd"]
[Result "0-1"]
[ECO "B81"]
[WhiteElo "2315"]
[BlackElo "2463"]
[PlyCount "108"]
[EventDate "1999.10.08"]
[EventType "team"]
[EventRounds "11"]
[EventCountry "BEL"]
[SourceTitle "CBM 073 Extra"]
[Source "ChessBase"]
[SourceDate "2000.01.11"]
[SourceVersion "1"]
[SourceVersionDate "2000.01.11"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. g4 h5 8. g5 Ng4 9. Bc1 Nc6 10. h3 Nge5 11. Be2 Nxd4 12. Qxd4 Nc6 13. Qd3 Bd7 14. Bf4 Ne5 15. Qd4 Qc7 16. Be3 b5 17. f4 Nc6 18. Qd2 g6 19. a3 Rb8 20. Rd1 Be7 21. h4 b4 22. axb4 Nxb4 23. Bd4 e5 24. fxe5 dxe5 25. Bxe5 Nxc2+ 26. Qxc2 Qxe5 27. Rxd7 Kxd7 28. Qa4+ Kd8 29. Rh3 Bb4 30. Qxa6 Re8 31. Kf1 Bxc3 32. Rxc3 Re7 33. Qc6 Rc7 34. Qxc7+ Qxc7 35. Rxc7 Kxc7 36. Bc4 Kd6 37. Kg1 Rf8 38. Bd5 f6 39. gxf6 Rxf6 40. Kg2 Ke5 41. Kg3 Rb6 42. b3 Rf6 43. Bb7 Rf7 44. Bc6 Rf6 45. Bb7 Rf1 46. Bc6 Rg1+ 47. Kh2 Rg4 48. Kh3 Kf4 49. b4 Rg3+ 50. Kh2 Kg4 51. Bd7+ Kxh4 52. e5 Re3 53. e6 Kg5 54. b5 Kf6 0-1

[Event "BEL-chT 9899"]
[Site "Antwerp"]
[Date "1999.03.??"]
[Round "9"]
[White "Koster, Leon"]
[Black "Akesson, Ralf"]
[Result "0-1"]
[ECO "D97"]
[WhiteElo "2320"]
[BlackElo "2530"]
[PlyCount "102"]
[EventDate "1998.10.??"]
[EventType "team"]
[EventRounds "11"]
[EventCountry "BEL"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 0-0 7. e4 Na6 8. Be2 c5 9. d5 e6 10. 0-0 exd5 11. exd5 Bf5 12. Rd1 Qb6 13. Qh4 Rad8 14. Ne5 Rde8 15. Nc4 Qd8 16. Bf4 Ne4 17. Qxd8 Rxd8 18. Nxe4 Bxe4 19. Nd6 Bc2 20. Nxb7 Bxd1 21. Rxd1 Nb4 22. Nxd8 Rxd8 23. Bc4 Bxb2 24. Bc7 Rf8 25. Rd2 Bc3 26. Re2 Rc8 27. Bf4 Rd8 28. Bh6 Bg7 29. Bxg7 Kxg7 30. a3 Nc6 31. Rd2 Nd4 32. Rb2 Rd6 33. Rb7 Rb6 34. Rxb6 axb6 35. a4 Kf8 36. f4 Ke7 37. d6+ Kxd6 38. Bxf7 Ne2+ 39. Kf2 Nxf4 40. Kf3 Ke5 41. Bg8 h6 42. h4 Nd5 43. Bf7 g5 44. hxg5 hxg5 45. g3 c4 46. Bg6 c3 47. Ke2 Kd4 48. Bf7 Nf6 49. Bb3 Nh5 50. g4 Nf4+ 51. Kd1 Nd3 0-1

[Event "NED-chT 9697"]
[Site "Netherlands"]
[Date "1996.??.??"]
[Round "?"]
[White "Koster, Leon"]
[Black "Van Mil, Johan"]
[Result "0-1"]
[ECO "B06"]
[BlackElo "2395"]
[PlyCount "58"]
[EventDate "1996.??.??"]
[EventType "team"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Nf3 Nf6 5. h3 0-0 6. Bg5 d5 7. Bd3 dxe4 8. Nxe4 Nxe4 9. Bxe4 Qb6 10. 0-0 Qxb2 11. Bxe7 Re8 12. Qd3 Qb6 13. Bh4 Be6 14. Rfe1 Na6 15. Rab1 Qc7 16. Bg3 Qd7 17. Ne5 Bxe5 18. Bxe5 Bxa2 19. Rb2 Bd5 20. Bxd5 cxd5 21. Reb1 Nc5 22. dxc5 Rxe5 23. Rxb7 Qc6 24. Qg3 Rae8 25. Rxa7 Qxc5 26. Rbb7 Rf5 27. Rc7 Re1+ 28. Kh2 Qxf2 29. Ra5 Qg1# 0-1

[Event "NED-chT 9697"]
[Site "Netherlands"]
[Date "1996.??.??"]
[Round "?"]
[White "Visser, Eddy"]
[Black "Koster, Leon"]
[Result "0-1"]
[ECO "C57"]
[PlyCount "62"]
[EventDate "1996.??.??"]
[EventType "team"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 b5 6. Bf1 Nd4 7. c3 Nxd5 8. Ne4 Qh4 9. Ng3 Bg4 10. f3 Bd6 11. cxd4 e4 12. Bxb5+ Kd8 13. 0-0 exf3 14. Rxf3 Rb8 15. Be2 Bxf3 16. Bxf3 Qxd4+ 17. Kh1 Bxg3 18. hxg3 Rb6 19. d3 Ne3 20. Bxe3 Qxe3 21. Nc3 Rh6+ 22. Bh5 g6 23. g4 gxh5 24. g5 Qxg5 25. Qf3 Rg8 26. Rf1 Qh4+ 27. Kg1 Rxg2+ 28. Qxg2 Rg6 29. Rxf7 Rxg2+ 30. Kxg2 Qg5+ 31. Kh3 Qd2 0-1

[Event "NED-chT 9697"]
[Site "Netherlands"]
[Date "1996.??.??"]
[Round "?"]
[White "Voormans, Jan"]
[Black "Koster, Leon"]
[Result "1/2-1/2"]
[ECO "D85"]
[WhiteElo "2230"]
[PlyCount "95"]
[EventDate "1996.??.??"]
[EventType "team"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Be3 c5 8. Qd2 Qa5 9. Rc1 cxd4 10. cxd4 Qxd2+ 11. Kxd2 0-0 12. Nf3 Nc6 13. Bb5 f5 14. exf5 Bxf5 15. Bxc6 bxc6 16. Rxc6 Rfb8 17. Kc3 Rb6 18. Rxb6 axb6 19. Ra1 Ra4 20. Ne5 b5 21. a3 Bxe5 22. dxe5 b4+ 23. Kb3 Rxa3+ 24. Rxa3 bxa3 25. Kxa3 Kf7 26. Bg5 Be4 27. g3 e6 28. Bf6 Bf3 29. Kb4 Bd5 30. Kc5 Bf3 31. Kd4 Be2 32. Ke3 Bd1 33. Kf4 Be2 34. Bg5 h5 35. Bf6 Bd1 36. f3 Be2 37. g4 hxg4 38. fxg4 Bd3 39. Kg5 Bb1 40. h3 Bc2 41. h4 Bb1 42. Bd8 Bd3 43. Bc7 Be4 44. Bb6 Bb1 45. Ba5 Bc2 46. Bb4 Bd3 47. Ba3 Be4 48. Bb2 1/2-1/2

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Koster, Leon"]
[Black "Kroeze, Frank"]
[Result "0-1"]
[ECO "C42"]
[BlackElo "2400"]
[PlyCount "58"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. 0-0 Bg4 8. c4 Nf6 9. Nc3 Bxf3 10. Qxf3 Nxd4 11. Qe3+ Ne6 12. cxd5 Nxd5 13. Nxd5 Qxd5 14. Be4 Qb5 15. a4 Qa6 16. Rd1 Be7 17. b3 Bf6 18. Qf3 Rd8 19. Rxd8+ Nxd8 20. Ra2 0-0 21. Ba3 Re8 22. Re2 Re6 23. Rd2 Nc6 24. Rd5 g6 25. g4 h6 26. h4 Nd4 27. Qe3 Qe2 28. Qxh6 Qxg4+ 29. Kh2 Re8 0-1

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Koster, Leon"]
[Black "Lane, Gary William"]
[Result "0-1"]
[ECO "C99"]
[BlackElo "2405"]
[PlyCount "113"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 0-0 8. c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 cxd4 13. cxd4 Bd7 14. Nf1 Rac8 15. Ne3 Nc6 16. d5 Nb4 17. Bb1 a5 18. a3 Na6 19. b4 g6 20. Bd2 Nh5 21. Kh2 Nf4 22. Ng1 Qa7 23. Ra2 Kh8 24. g3 Nh5 25. Qe2 Ng7 26. Bd3 Nc7 27. Nc2 f5 28. Kg2 fxe4 29. Bxe4 Bf5 30. f3 a4 31. Ne3 Qd4 32. Nc2 Qc4 33. Qxc4 bxc4 34. Ne2 Bd7 35. Nc3 Nf5 36. Ne3 Nb5 37. Nxb5 Bxb5 38. Bxf5 gxf5 39. Nd1 Bd7 40. Nc3 Rg8 41. Kh2 h5 42. Nd1 h4 43. g4 Rcf8 44. Rc2 Bb5 45. Ne3 fxg4 46. fxg4 Rf2+ 47. Kg1 Rf3 48. Kg2 e4 49. Bc3+ Kh7 50. Nxc4 Rgf8 51. Rxe4 Bg5 52. Nxd6 Bf1+ 53. Kg1 Rg3+ 54. Kh2 Rxh3+ 55. Kg1 Bd3 56. Rf2 Rg3+ 57. Rg2 0-1

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Koster, Leon"]
[Black "Oosterom, Erik"]
[Result "1-0"]
[ECO "B58"]
[BlackElo "2205"]
[PlyCount "95"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nf3 h6 8. 0-0 Be7 9. h3 0-0 10. Re1 Be6 11. Bf1 Qa5 12. Bd2 Qd8 13. Bc1 Qa5 14. a3 Rfc8 15. Rb1 Nb8 16. Bd2 Qc7 17. Rc1 Nbd7 18. Be3 Nc5 19. Nd5 Bxd5 20. exd5 b5 21. Bxb5 Rab8 22. Bc6 e4 23. b4 exf3 24. bxc5 fxg2 25. Bf4 Bf8 26. c4 Qa5 27. cxd6 Rd8 28. c5 Qxa3 29. Re3 Qb4 30. Be5 Ne4 31. Qe1 Nd2 32. Bc3 Qxc5 33. Qxd2 Qxd6 34. Rg3 Rbc8 35. Qd4 f6 36. Ra1 Qb8 37. Kxg2 Rxc6 38. dxc6 Rxd4 39. Bxd4 Qd6 40. Rc1 Qd5+ 41. Kg1 Bd6 42. c7 Bxc7 43. Rxc7 Qxd4 44. Rgxg7+ Kf8 45. Rgd7 Qa1+ 46. Kg2 Ke8 47. Rh7 f5 48. Rc8# 1-0

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Koster, Leon"]
[Black "Overveld, Ronald"]
[Result "0-1"]
[ECO "A39"]
[PlyCount "72"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. g3 c5 2. Bg2 Nc6 3. c4 g6 4. Nf3 Bg7 5. Nc3 d6 6. 0-0 Nf6 7. d4 cxd4 8. Nxd4 Bd7 9. b3 Qb6 10. Nc2 0-0 11. Bb2 Ne5 12. Ne3 Bc6 13. Ned5 Bxd5 14. Na4 Qa5 15. cxd5 Rfc8 16. a3 Rc7 17. f4 Neg4 18. Qd3 Nh5 19. Bxg7 Nxg7 20. h3 Nf6 21. Kh2 Rac8 22. Bf3 Rc2 23. Rfb1 b5 24. Nc5 Qd2 25. Qxd2 Rxd2 26. Nd3 Rc3 27. Kg1 Nf5 28. Rc1 Rxb3 29. Rcb1 Rxb1+ 30. Rxb1 Nd4 31. Kf2 Ra2 32. Rb4 Nxf3 33. Kxf3 a6 34. a4 Nxd5 35. Rd4 Nc3 36. axb5 Nxe2 0-1

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Nep, Ron"]
[Black "Koster, Leon"]
[Result "1/2-1/2"]
[ECO "D85"]
[PlyCount "131"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 g6 3. c4 Bg7 4. Nc3 d5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 c5 8. Rb1 0-0 9. Be2 cxd4 10. cxd4 Qa5+ 11. Bd2 Qxa2 12. 0-0 a5 13. Qc1 Qe6 14. Bc4 Qd6 15. Bf4 Qd8 16. Bc7 Qe8 17. d5 Bd7 18. Rxb7 Qc8 19. Qb1 Nc6 20. Qb6 Nd4 21. Rb1 Nxf3+ 22. gxf3 a4 23. Ba2 a3 24. Rb4 Ra4 25. Ra7 Rxa7 26. Qxa7 Bh3 27. Rc4 Bb2 28. Bf4 Qe8 29. Bh6 Qb8 30. Qxb8 Rxb8 31. f4 Bf6 32. e5 Rb2 33. exf6 Rxa2 34. f3 Rg2+ 35. Kh1 a2 36. Ra4 Rc2 37. Kg1 exf6 38. Ra8+ Rc8 39. Rxa2 Rc1+ 40. Kf2 Rc8 41. Ke3 Rd8 42. Rd2 Bd7 43. Kd4 Be6 44. Kc5 Rc8+ 45. Kd6 Rd8+ 46. Kc6 Rc8+ 47. Kb7 Rd8 48. d6 Kh8 49. Rd4 f5 50. Bg5 Rd7+ 51. Kc6 Kg7 52. Be7 f6 53. Ra4 h6 54. Ra8 g5 55. Rf8 Ra7 56. Rxf6 Bd7+ 57. Kb6 Ra2 58. Kc7 Ra7+ 59. Kb6 Ra2 60. fxg5 hxg5 61. Rf8 Be6 62. Kc7 Rc2+ 63. Kb6 Rxh2 64. Rf6 Bc8 65. Rf8 Be6 66. Rf6 1/2-1/2

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Obers, Frits"]
[Black "Koster, Leon"]
[Result "0-1"]
[ECO "B92"]
[WhiteElo "2130"]
[PlyCount "82"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nf3 h6 8. 0-0 Be6 9. Re1 Be7 10. Bf1 0-0 11. h3 b5 12. a3 Nbd7 13. Be3 Nb6 14. Qd2 Nc4 15. Bxc4 bxc4 16. a4 Rb8 17. a5 Qc8 18. Bb6 Qc6 19. Rad1 Nd7 20. Ra1 Nxb6 21. axb6 Rxb6 22. Ra2 Rfb8 23. Rea1 Rxb2 24. Rxa6 R2b6 25. Ra7 Bd8 26. R1a4 Bc7 27. Nd5 Rb1+ 28. Kh2 Bd8 29. R7a6 Qd7 30. Rxc4 Rf1 31. Rcc6 Rbb1 32. Rxd6 Qc8 33. Rac6 Qa8 34. Nc7 Bxc7 35. Rxc7 Qxe4 36. Rd8+ Kh7 37. Qd3 Qxd3 38. cxd3 Rxf2 39. Nxe5 Rbb2 40. d4 Rxg2+ 41. Kh1 Bxh3 0-1

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Schouten, Nico"]
[Black "Koster, Leon"]
[Result "1-0"]
[ECO "E99"]
[WhiteElo "2265"]
[PlyCount "59"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 0-0 6. Be2 e5 7. 0-0 Nc6 8. d5 Ne7 9. Ne1 Nd7 10. Nd3 f5 11. f3 f4 12. g4 Bf6 13. Kh1 h5 14. gxh5 gxh5 15. Rg1+ Kf7 16. Bxf4 exf4 17. Nxf4 Nc5 18. Qd2 Qd7 19. b4 Na4 20. Nb5 Bxa1 21. Rxa1 Rg8 22. Ne6 Rg6 23. Nbxc7 Ng8 24. Nxa8 Qe7 25. Nac7 Nh6 26. Qf4+ Kg8 27. Rg1 Rxg1+ 28. Kxg1 Nc3 29. Bd3 Bxe6 30. Nxe6 1-0

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Van Blitterswijk, Stefan"]
[Black "Koster, Leon"]
[Result "1-0"]
[ECO "C97"]
[WhiteElo "2250"]
[PlyCount "49"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Bd7 13. Nf1 Nc4 14. d5 Nb6 15. Ng3 g6 16. Nh2 h5 17. Rf1 Rae8 18. Ne2 Nh7 19. f4 exf4 20. Nxf4 Bf6 21. Qf3 Nc4 22. Nxh5 gxh5 23. e5 Rxe5 24. Bxh7+ Kxh7 25. Qxf6 1-0

[Event "BEL-chT 9394"]
[Site "Belgium"]
[Date "1994.01.16"]
[Round "7"]
[White "Cools, Gorik"]
[Black "Koster, Leon"]
[Result "1-0"]
[ECO "B93"]
[WhiteElo "2275"]
[PlyCount "63"]
[EventDate "1993.10.03"]
[EventType "team-tourn"]
[EventRounds "11"]
[EventCountry "BEL"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 Nbd7 7. Bc4 g6 8. Qe2 Qc7 9. Nf3 Nb6 10. Bb3 Bg4 11. 0-0 e6 12. f5 gxf5 13. exf5 Bxf5 14. Ng5 0-0-0 15. Nxf7 Qxf7 16. Rxf5 d5 17. Rf1 Rg8 18. Be3 Nbd7 19. Bd4 Rg6 20. Rae1 Bc5 21. Qe3 Rdg8 22. Re2 Qg7 23. g3 Bxd4 24. Qxd4 Rxg3+ 25. Kh1 Rg2 26. Nxd5 exd5 27. Rfe1 Rxe2 28. Rxe2 Qg5 29. c4 Qc1+ 30. Bd1 Rg4 31. Qd3 dxc4 32. Rc2 1-0

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "2"]
[White "Koster, Leon"]
[Black "Bosch, Jeroen"]
[Result "1-0"]
[ECO "A53"]
[BlackElo "2370"]
[PlyCount "79"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 Bf5 4. g3 e5 5. Bg2 c6 6. e4 Bg6 7. d5 Nbd7 8. Be3 Be7 9. f3 0-0 10. Nh3 Qb8 11. Nf2 Bd8 12. Qe2 Bb6 13. Bxb6 Nxb6 14. Nfd1 a5 15. 0-0 Qa7 16. Rf2 a4 17. Ne3 Qa5 18. Qe1 Nfd7 19. Rd1 Qc5 20. Bf1 Rfd8 21. Rfd2 Nf6 22. Kh1 Qb4 23. Nc2 Qxb2 24. Rf2 Nxc4 25. Rb1 Qxb1 26. Qxb1 cxd5 27. Bxc4 dxc4 28. Qb4 d5 29. exd5 Nxd5 30. Nxd5 Rxd5 31. Qxc4 Rd1+ 32. Kg2 Rc1 33. Qc7 h5 34. Qxb7 Rd8 35. Ne3 Rd3 36. Re2 Rd4 37. Qb8+ Kh7 38. Qxe5 Rb4 39. Nf5 f6 40. Qe7 1-0

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "6"]
[White "Koster, Leon"]
[Black "Landtman, Milco"]
[Result "1-0"]
[ECO "C45"]
[PlyCount "39"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Bc4 Bb6 8. 0-0 0-0 9. Nc2 d6 10. Bxb6 axb6 11. Ne3 Be6 12. Bd5 Ng6 13. Na3 Rae8 14. Nb5 Re7 15. g3 Rd7 16. f4 Bh3 17. Rf2 Nge7 18. Qh5 Be6 19. f5 Bxd5 20. Ng4 1-0

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "9"]
[White "Koster, Leon"]
[Black "Riemersma, Liafbern"]
[Result "0-1"]
[ECO "B83"]
[BlackElo "2440"]
[PlyCount "72"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Be2 e6 7. Be3 Be7 8. 0-0 0-0 9. f4 Bd7 10. Qe1 Nxd4 11. Bxd4 Bc6 12. Qg3 g6 13. Bf3 b5 14. a3 a5 15. b4 d5 16. exd5 Nxd5 17. Nxd5 Bxd5 18. c3 Qd7 19. f5 axb4 20. f6 Bd6 21. Qg5 Rfe8 22. Bxd5 exd5 23. axb4 h5 24. Rae1 Rxe1 25. Rxe1 Re8 26. Rf1 Kh7 27. Rf3 Re4 28. Qd2 Qe6 29. Re3 Rxe3 30. Bxe3 Be5 31. Qd3 Bxf6 32. Bf2 Qe4 33. Qxb5 Bxc3 34. h3 Bxb4 35. Qd7 Kg7 36. Qa7 Bc3 0-1

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "4"]
[White "Koster, Leon"]
[Black "Van der Wiel, John"]
[Result "0-1"]
[ECO "E92"]
[BlackElo "2570"]
[PlyCount "68"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 0-0 5. Nf3 d6 6. Be2 e5 7. Be3 Ng4 8. Bg5 f6 9. Bh4 Nc6 10. d5 Ne7 11. Nd2 Nh6 12. f3 c5 13. Rb1 b6 14. b4 f5 15. bxc5 bxc5 16. Qa4 fxe4 17. Ndxe4 Nhf5 18. Bf2 Nd4 19. Bd3 Nef5 20. 0-0 Bh6 21. Nb5 Bd7 22. Qa3 Bxb5 23. cxb5 Ne3 24. Bxe3 Bxe3+ 25. Kh1 Nf5 26. Bc4 Bd4 27. Qd3 Rb8 28. Rb3 Rb7 29. Qd2 h5 30. a4 h4 31. a5 Rh7 32. b6 Ng3+ 33. Nxg3 hxg3 34. h3 Qd7 0-1

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "7"]
[White "Lemmers, Oscar"]
[Black "Koster, Leon"]
[Result "1-0"]
[ECO "C07"]
[WhiteElo "2375"]
[PlyCount "81"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd6 7. Qe2 Nf6 8. Nb3 Nc6 9. Bg5 Be7 10. 0-0-0 Nd5 11. Nbxd4 Bxg5+ 12. Nxg5 Qf4+ 13. Qd2 Qxd2+ 14. Rxd2 Nxd4 15. Bxd5 h6 16. Rxd4 hxg5 17. Bf3 Rh4 18. Rhd1 Rxd4 19. Rxd4 f5 20. Rc4 Kd8 21. Rc3 Rb8 22. Bh5 b6 23. Rg3 g4 24. f3 g5 25. fxg4 f4 26. Rd3+ Ke7 27. g3 e5 28. gxf4 exf4 29. Rd5 Kf6 30. Rd8 Ra8 31. Rf8+ Kg7 32. Rf7+ Kg8 33. Rf6 Kh7 34. Rf8 Kg7 35. Rf7+ Kg8 36. Rf6 Kh7 37. c4 Ba6 38. b3 Bc8 39. h3 Ba6 40. Kc2 Bc8 41. Kc3 1-0

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "3"]
[White "Nijboer, Friso"]
[Black "Koster, Leon"]
[Result "1/2-1/2"]
[ECO "B33"]
[WhiteElo "2530"]
[PlyCount "102"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 d6 7. Bf4 e5 8. Bg5 a6 9. Na3 b5 10. Nd5 Qa5+ 11. Bd2 Qd8 12. c4 Nxe4 13. cxb5 Be6 14. Nc3 Nxc3 15. Bxc3 axb5 16. Bxb5 Qb6 17. Qe2 d5 18. 0-0 Bxa3 19. bxa3 0-0 20. Bxc6 Qxc6 21. Qxe5 f6 22. Qd4 Rxa3 23. Bb4 Ra4 24. a3 Rc8 25. Rfe1 Qd7 26. Rad1 Ra6 27. Qf4 Re8 28. h3 Bf7 29. Rxe8+ Bxe8 30. Qb8 Re6 31. Rc1 Rc6 32. Re1 Re6 33. Rxe6 Qxe6 34. a4 Qe5 35. Qxe5 fxe5 36. a5 Bb5 37. Bd6 e4 38. Bc5 Kf7 39. Bd4 g6 40. Kh2 Ke6 41. g4 h5 42. Kg3 Be2 43. Kf4 hxg4 44. hxg4 Kd6 45. Kg5 Kc6 46. a6 Kc7 47. a7 Kb7 48. Kf4 Ka8 49. g5 Kb7 50. Ke5 Bg4 51. Kxd5 Bf5 1/2-1/2

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "8"]
[White "Sokolov, Ivan"]
[Black "Koster, Leon"]
[Result "1-0"]
[ECO "D85"]
[WhiteElo "2650"]
[PlyCount "67"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bb5+ Bd7 8. Be2 c5 9. Nf3 0-0 10. 0-0 Nc6 11. h3 Rc8 12. Rb1 Na5 13. Bg5 cxd4 14. cxd4 f5 15. Ne5 Be6 16. d5 Bxd5 17. Nxg6 hxg6 18. exd5 Rc5 19. Bf3 b6 20. Re1 Bf6 21. Re6 Kg7 22. Qd2 Nc4 23. Qf4 Rf7 24. Rbe1 Rc7 25. Qg3 Rd7 26. Bh5 gxh5 27. Rxf6 Rxf6 28. Bxf6+ Kxf6 29. Re6+ Kf7 30. Qg6+ Kf8 31. Qh6+ Kf7 32. Qh7+ Kf8 33. Rg6 Rxd5 34. Rg8# 1-0

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "1"]
[White "Van Mil, Johan"]
[Black "Koster, Leon"]
[Result "0-1"]
[ECO "B19"]
[WhiteElo "2450"]
[PlyCount "147"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 Ngf6 11. Bd2 e6 12. 0-0-0 Be7 13. Qe2 0-0 14. Ne5 c5 15. dxc5 Nxc5 16. Kb1 Qc7 17. Bf4 Rfd8 18. Qf3 Rxd1+ 19. Rxd1 Rd8 20. Nd3 Qb6 21. Be3 Qc7 22. Bxc5 Bxc5 23. Ne4 Be7 24. g4 Qc4 25. Re1 Rd5 26. Nc3 Rd8 27. Qxb7 Bd6 28. f3 Bg3 29. Rg1 Bh2 30. Rh1 Qd4 31. Qc6 Rb8 32. Qc5 Qxc5 33. Nxc5 Be5 34. N5a4 Rb4 35. b3 Rf4 36. Rh3 Rd4 37. Kc1 Bf4+ 38. Kb2 Rd2 39. Nb1 Rf2 40. Nac3 Be5 41. b4 Nd5 42. Kb3 Nf4 43. Rh1 Rxf3 44. Kc4 Ng2 45. Nd1 f5 46. gxf5 Rxf5 47. b5 Bf6 48. Nbc3 Nf4 49. Ne4 Be7 50. a4 Nxh5 51. a5 Nf6 52. Ndf2 Nd5 53. Kd4 Bd8 54. c4 Bxa5 55. Nd3 Nc7 56. Ra1 Bb6+ 57. c5 Nxb5+ 58. Kc4 Nc7 59. cxb6 axb6 60. Ra7 Nd5 61. Kd4 h5 62. Nd6 Rf1 63. Ne5 Rd1+ 64. Kc4 Ne3+ 65. Kc3 Rxd6 66. Ra8+ Kh7 67. Nf7 Rd5 68. Re8 Kg6 69. Nd8 Kf6 70. Nxe6 Re5 71. Nxg7 Rc5+ 72. Kd4 Nc2+ 73. Kd3 Kxg7 74. Re6 0-1

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "5"]
[White "Winants, Luc"]
[Black "Koster, Leon"]
[Result "1-0"]
[ECO "A55"]
[WhiteElo "2495"]
[PlyCount "55"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c6 2. c4 e5 3. Nf3 d6 4. d4 Nd7 5. Nc3 Ngf6 6. Be2 Be7 7. 0-0 0-0 8. b3 a6 9. Qc2 Qc7 10. Ba3 Re8 11. Rac1 Bf8 12. Rfd1 exd4 13. Nxd4 Nc5 14. f3 a5 15. Bf1 g6 16. Rb1 Bd7 17. Kh1 Rad8 18. Qf2 Bg7 19. Nde2 Bf8 20. Bc1 Ne6 21. Be3 c5 22. g4 h6 23. h4 Bc6 24. Nd5 Bxd5 25. cxd5 Nd4 26. Nxd4 cxd4 27. Bxd4 Bg7 28. Bb6 1-0

[Event "BEL-chT 9394"]
[Site "Belgium"]
[Date "1993.12.19"]
[Round "6.4"]
[White "Henris, Luc"]
[Black "Koster, Leon"]
[Result "0-1"]
[ECO "B22"]
[WhiteElo "2270"]
[PlyCount "80"]
[EventDate "1993.10.03"]
[EventType "team-tourn"]
[EventRounds "11"]
[EventCountry "BEL"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. c3 e6 4. d4 d5 5. exd5 Qxd5 6. Na3 Nf6 7. Nb5 Qd8 8. dxc5 Bxc5 9. Qxd8+ Kxd8 10. Bf4 Ne4 11. Nbd4 Nxd4 12. Nxd4 e5 13. Bxe5 Re8 14. 0-0-0 Rxe5 15. Nc6+ Kc7 16. Nxe5 Nxf2 17. Bc4 Nxh1 18. Rxh1 f6 19. Nd3 Bd6 20. g3 Bd7 21. Re1 Re8 22. Rxe8 Bxe8 23. Nf4 Bxf4+ 24. gxf4 g5 25. fxg5 fxg5 26. Kd2 Kd6 27. Ke3 Ke5 28. b4 h5 29. Be2 g4 30. c4 Bd7 31. c5 a6 32. a3 Bb5 33. Bd1 Bc6 34. Be2 Bd7 35. Bd3 h4 36. Be2 g3 37. hxg3 hxg3 38. Bd1 Bc6 39. a4 g2 40. Kf2 Kd4 0-1

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.18"]
[Round "9"]
[White "Skalik, Przemyslaw"]
[Black "Koster, Leon"]
[Result "1/2-1/2"]
[ECO "E45"]
[WhiteElo "2340"]
[PlyCount "22"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Nge2 Ba6 6. a3 Bxc3+ 7. Nxc3 d5 8. b3 Nc6 9. Be2 dxc4 10. bxc4 Qd7 11. Qb3 0-0 1/2-1/2

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.17"]
[Round "8"]
[White "Koster, Leon"]
[Black "Jelen, Igor"]
[Result "1-0"]
[ECO "B33"]
[BlackElo "2305"]
[PlyCount "67"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5 11. Bd3 Be6 12. Qh5 Rg8 13. c3 b4 14. Nc4 bxc3 15. bxc3 Rc8 16. Ncb6 fxe4 17. Bxe4 Rg4 18. Bf5 Rg5 19. Bxe6 Rxh5 20. Bd7+ Qxd7 21. Nxd7 Rh6 22. N7f6+ Kd8 23. 0-0 Bg7 24. Ng4 Rg6 25. Nge3 Ne7 26. Rab1 e4 27. Rb7 Re6 28. c4 Be5 29. Rfb1 h5 30. Nb6 Rc5 31. Ned5 f5 32. Nxe7 Rxe7 33. Rb8+ Kc7 34. Nd5+ 1-0

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.16"]
[Round "7"]
[White "Adamson, Robby"]
[Black "Koster, Leon"]
[Result "1/2-1/2"]
[ECO "C84"]
[PlyCount "41"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d4 exd4 6. 0-0 Be7 7. Re1 b5 8. e5 Nxe5 9. Nxe5 bxa4 10. Qxd4 0-0 11. Bg5 Re8 12. Nc3 Rb8 13. Nd5 Bb7 14. Nxe7+ Qxe7 15. Nd3 Qd6 16. Qxd6 cxd6 17. Bxf6 gxf6 18. Rxe8+ Rxe8 19. Kf1 Be4 20. Ne1 Bc6 21. b3 1/2-1/2

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.15"]
[Round "6"]
[White "Koster, Leon"]
[Black "Van Amerongen, Marleen"]
[Result "1-0"]
[ECO "B88"]
[PlyCount "49"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 Be7 8. Be3 Qc7 9. f4 Nc6 10. Qf3 0-0 11. 0-0 Nd7 12. Qg3 Nc5 13. Nxc6 Qxc6 14. Bd4 f6 15. f5 Nxb3 16. axb3 b5 17. Qd3 Rb8 18. fxe6 Bxe6 19. Nd5 Bxd5 20. exd5 Qc8 21. Rae1 Qd7 22. Re6 Kh8 23. Rf3 Rf7 24. Rh3 f5 25. Reh6 1-0

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.14"]
[Round "5"]
[White "Brouwer, Dennis"]
[Black "Koster, Leon"]
[Result "1/2-1/2"]
[ECO "D38"]
[PlyCount "93"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 d5 5. cxd5 exd5 6. Bg5 h6 7. Bh4 c5 8. e3 Nc6 9. Bd3 c4 10. Bc2 0-0 11. 0-0 Bxc3 12. bxc3 Re8 13. Nd2 g5 14. Bg3 Qa5 15. Rc1 Qxa2 16. h3 Qa3 17. Bb1 b5 18. Re1 b4 19. Bd6 Re6 20. Bc5 Nd7 21. Qc2 Nxc5 22. Qh7+ Kf8 23. dxc5 bxc3 24. Nf3 Qxc5 25. Bf5 Qd6 26. Bxe6 Qxe6 27. Qh8+ Ke7 28. Nd4 Qg6 29. Nxc6+ Qxc6 30. e4 dxe4 31. Qe5+ Be6 32. Qxe4 Qxe4 33. Rxe4 Kd6 34. Rxc3 Kc5 35. Kf1 a5 36. Ree3 a4 37. Ke2 Kb4 38. Ra3 Rd8 39. Rac3 Bf5 40. g4 Bg6 41. Rc1 a3 42. Re7 Bd3+ 43. Ke3 c3 44. Rb7+ Kc4 45. Rc7+ Kb4 46. Rb7+ Kc4 47. Rc7+ 1/2-1/2

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.12"]
[Round "4"]
[White "Koster, Leon"]
[Black "Sievers, Stefan"]
[Result "0-1"]
[ECO "B78"]
[BlackElo "2330"]
[PlyCount "52"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Qd2 0-0 9. Bc4 Bd7 10. 0-0-0 Rc8 11. Bb3 Ne5 12. h4 h5 13. Bg5 Rc5 14. g4 hxg4 15. h5 Nxh5 16. Nd5 Re8 17. Rxh5 gxh5 18. Qh2 Rxd5 19. Bxd5 Qb6 20. Qxh5 e6 21. Bb3 gxf3 22. Bh6 Qc5 23. Nf5 exf5 24. Qg5 Nd3+ 25. Rxd3 Qe5 26. Rxf3 Qxb2+ 0-1

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.11"]
[Round "3"]
[White "De Jager, Jaap"]
[Black "Koster, Leon"]
[Result "1/2-1/2"]
[ECO "A03"]
[PlyCount "41"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. f4 d5 2. b3 Bg4 3. h3 Bh5 4. g4 Bg6 5. Nf3 e6 6. e3 Be7 7. Bb2 Bh4+ 8. Ke2 Bf6 9. Qc1 c5 10. d3 Nc6 11. Nbd2 Qc7 12. c3 0-0-0 13. d4 cxd4 14. cxd4 Nb4 15. Ne1 Qxc1 16. Rxc1+ Kb8 17. a3 Nc6 18. Nd3 Bxd3+ 19. Kxd3 g6 20. Be2 Nge7 21. Bf3 1/2-1/2

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.10"]
[Round "2"]
[White "Koster, Leon"]
[Black "Mihevc Mohr, Narcisa"]
[Result "1-0"]
[ECO "B33"]
[BlackElo "2135"]
[PlyCount "53"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5 11. c3 Bg7 12. exf5 Bxf5 13. Nc2 Ne7 14. Nxe7 Kxe7 15. Ne3 Be6 16. Nd5+ Kf8 17. g3 Rc8 18. Bg2 Rc5 19. a4 f5 20. axb5 axb5 21. Ra7 e4 22. Nf4 Bc4 23. Bf1 Bf7 24. Be2 Be5 25. Qd2 Qb8 26. Ne6+ Ke8 27. Qg5 1-0

[Event "Sas van Gent ECI op U20"]
[Site "Sas van Gent"]
[Date "1990.08.09"]
[Round "1"]
[White "Van de Vorst, Christel"]
[Black "Koster, Leon"]
[Result "0-1"]
[ECO "B07"]
[PlyCount "110"]
[EventDate "1990.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. c3 d6 3. d4 Nf6 4. Bd3 Nc6 5. Nf3 Bg4 6. d5 Bxf3 7. Qxf3 Ne5 8. Bb5+ Ned7 9. 0-0 a6 10. Be2 g6 11. a4 Bg7 12. Nd2 0-0 13. a5 b5 14. axb6 Nxb6 15. Rxa6 Nfd7 16. Rxa8 Qxa8 17. Qd3 Rb8 18. f4 Qa2 19. Bd1 c4 20. Qe2 Nc5 21. Bc2 Bxc3 22. Bb1 Bd4+ 23. Kh1 Qa6 24. b4 c3 25. Qxa6 Nxa6 26. Nb3 Bg7 27. b5 Nb4 28. Ba3 Nc4 29. Bxb4 Rxb5 30. Bxc3 Rxb3 31. Bxg7 Kxg7 32. Re1 Nd2 33. Bc2 Rc3 34. Bd1 Rc1 35. Kg1 Nxe4 36. Rxe4 Rxd1+ 37. Kf2 Kf6 38. g4 Rxd5 39. g5+ Kf5 40. Rxe7 Kxf4 41. Rxf7+ Kxg5 42. Rxh7 Re5 43. Rd7 d5 44. Kf3 Rf5+ 45. Ke3 Kg4 46. Kd4 Rh5 47. Rxd5 Rxh2 48. Ke3 g5 49. Rd1 Kg3 50. Rd3 g4 51. Ke4+ Kh4 52. Kf4 Rf2+ 53. Ke4 Rf8 54. Rd7 Kh3 55. Rh7+ Kg2 0-1

[Event "FRG corr"]
[Site "GER corr"]
[Date "1984.??.??"]
[Round "?"]
[White "Timmerman, Gert Jan"]
[Black "Koster, Leon"]
[Result "1-0"]
[ECO "C18"]
[PlyCount "53"]
[EventDate "1984.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "Corr 2000"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 cxd4 8. Qxg7 Rg8 9. Qxh7 Qc7 10. Ne2 Nbc6 11. f4 Bd7 12. Qd3 dxc3 13. h3 0-0-0 14. g4 d4 15. Rb1 Be8 16. Bg2 Nd5 17. 0-0 f6 18. Nxd4 Nxf4 19. Bxf4 Rxd4 20. Qxc3 fxe5 21. Be3 Rd5 22. Rf6 Qe7 23. Rbf1 Kb8 24. Bxd5 exd5 25. Bc5 d4 26. Bxe7 dxc3 27. Rf8 1-0

