[Event "Groningen op compact-A 51st"]
[Site "Groningen"]
[Date "2013.12.30"]
[Round "5"]
[White "Postma, Jan"]
[Black "Ratsma, Midas"]
[Result "1/2-1/2"]
[ECO "A31"]
[WhiteElo "1999"]
[BlackElo "2145"]
[PlyCount "68"]
[EventDate "2013.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 c5 3. c4 cxd4 4. Nxd4 e5 5. Nc2 Nc6 6. g3 d5 7. cxd5 Qxd5 8. Qxd5 Nxd5 9. Bg2 Be6 10. 0-0 Bc5 11. Bd2 0-0 12. Nc3 Rad8 13. Nxd5 Bxd5 14. Bc3 f6 15. Rfd1 Bxg2 16. Kxg2 Kf7 17. a3 Ke6 18. Rac1 g6 19. Na1 Nd4 20. Bxd4 Bxd4 21. Rc2 Bb6 22. Rxd8 Rxd8 23. Nb3 Rd5 24. Nd2 Rd7 25. Ne4 Rc7 26. Rxc7 Bxc7 27. Kf1 h6 28. Nc3 Ba5 29. b4 Bd8 30. e4 a5 31. Ke2 axb4 32. axb4 Bb6 33. f3 Bd4 34. Nd5 h5 1/2-1/2

[Event "Groningen op compact-A 51st"]
[Site "Groningen"]
[Date "2013.12.29"]
[Round "4"]
[White "Polee, Hans"]
[Black "Postma, Jan"]
[Result "0-1"]
[ECO "D33"]
[WhiteElo "2078"]
[BlackElo "1999"]
[PlyCount "76"]
[EventDate "2013.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 Nc6 3. Nc3 e6 4. g3 d5 5. cxd5 exd5 6. d4 c4 7. Bg2 Bb4 8. 0-0 Nge7 9. Ne5 0-0 10. Nxc6 bxc6 11. e4 Be6 12. Qc2 h6 13. Rd1 Re8 14. Ne2 Ng6 15. Be3 Qd7 16. Qa4 Rab8 17. a3 Bf8 18. Nc3 Qb7 19. Rd2 Bd6 20. f4 f5 21. e5 Bc7 22. b4 a5 23. Rb1 axb4 24. axb4 Ra8 25. Qc2 Ra3 26. b5 Ba5 27. bxc6 Qxc6 28. Nd1 Bxd2 29. Bxd2 Rea8 30. Nc3 Ra1 31. Kf2 Rxb1 32. Qxb1 Ne7 33. Qb4 Nc8 34. Qc5 Qxc5 35. dxc5 Ne7 36. Nb5 Ra2 37. Ke3 Bd7 38. Nd4 Ba4 0-1

[Event "Groningen op compact-A 51st"]
[Site "Groningen"]
[Date "2013.12.28"]
[Round "3"]
[White "Nicolai, Amir"]
[Black "Postma, Jan"]
[Result "0-1"]
[ECO "D40"]
[WhiteElo "2051"]
[BlackElo "1999"]
[PlyCount "68"]
[EventDate "2013.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c5 4. e3 Nf6 5. Nc3 Nc6 6. Bd3 a6 7. a3 dxc4 8. Bxc4 b5 9. Ba2 Be7 10. d5 exd5 11. Nxd5 0-0 12. Nxe7+ Qxe7 13. Qc2 g6 14. b3 Bf5 15. Qe2 Rfd8 16. Bb1 Be6 17. Bc2 c4 18. Rb1 Nd5 19. Bb2 c3 20. Bc1 Qf6 21. h3 Rd7 22. Nh2 b4 23. a4 Nc7 24. Ng4 Bxg4 25. hxg4 Rad8 26. g5 Qxg5 27. Qf3 Ne5 28. Qh3 Nd3+ 29. Bxd3 Rxd3 30. Qxh7+ Kf8 31. Rh4 Qxg2 32. Qh8+ Ke7 33. Qe5+ Ne6 34. Ba3 bxa3 0-1

[Event "Groningen op compact-A 51st"]
[Site "Groningen"]
[Date "2013.12.27"]
[Round "2"]
[White "Postma, Jan"]
[Black "Scharft, Johan"]
[Result "1-0"]
[ECO "D52"]
[WhiteElo "1999"]
[BlackElo "2032"]
[PlyCount "76"]
[EventDate "2013.12.26"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. Nd2 Bb4 8. Qc2 Ne4 9. Ndxe4 dxe4 10. Bh4 0-0 11. Be2 f5 12. 0-0 Bxc3 13. Qxc3 Qxc3 14. bxc3 Nf6 15. f3 exf3 16. gxf3 b6 17. a4 Ba6 18. a5 Nd7 19. Ra2 b5 20. c5 h6 21. f4 Kf7 22. Kh1 Rab8 23. Rg1 g6 24. Bf3 Rbc8 25. Rb2 Rg8 26. Rb4 Rc7 27. Rb2 Rcc8 28. e4 Nf6 29. Bxf6 Kxf6 30. h4 Rg7 31. e5+ Kf7 32. Rbg2 Bb7 33. a6 Bxa6 34. Ra1 Bb7 35. Rxa7 Kf8 36. Kg1 Rd8 37. Kf2 b4 38. Ke3 bxc3 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.07.02"]
[Round "7"]
[White "Postma, Jan"]
[Black "Wagemans, Ed"]
[Result "1/2-1/2"]
[ECO "B20"]
[PlyCount "108"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. c4 Nc6 3. Nf3 g6 4. Nc3 Bg7 5. Be2 e6 6. d3 Nge7 7. Be3 b6 8. d4 cxd4 9. Nxd4 0-0 10. 0-0 f5 11. Nxc6 dxc6 12. Qxd8 Rxd8 13. Bg5 Kf7 14. exf5 gxf5 15. Bh5+ Kf8 16. Rad1 Ba6 17. Be2 h6 18. Be3 Ng6 19. Rxd8+ Rxd8 20. Rd1 Rxd1+ 21. Nxd1 Ke7 22. a4 c5 23. a5 Bb7 24. f4 Kd6 25. axb6 axb6 26. g3 Be4 27. Kf1 Ne7 28. Bd2 Nc6 29. Nc3 Bxc3 30. Bxc3 Nd4 31. Kf2 Bc6 32. Bd1 b5 33. cxb5 Bxb5 34. b4 Kd5 35. bxc5 Kxc5 36. Ke3 Nc6 37. Bg7 Kd6 38. Bxh6 Ke7 39. Bg7 Kf7 40. Bc3 Ne7 41. Bh5+ Kg8 42. Bf3 Kf7 43. Kd4 Ba6 44. Ke5 Bc4 45. Bh5+ Kg8 46. Bf3 Kf7 47. Bb7 Bb3 48. Bb4 Ng8 49. Bf3 Nf6 50. h3 Bc4 51. g4 fxg4 52. hxg4 Bd5 53. Bxd5 Nxg4+ 54. Kd4 exd5 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.25"]
[Round "6"]
[White "Verschoor, Marcel"]
[Black "Postma, Jan"]
[Result "0-1"]
[ECO "B41"]
[PlyCount "98"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Be2 Nc6 6. 0-0 Qc7 7. c3 Nf6 8. f3 h6 9. Be3 Be7 10. Nd2 d6 11. Rc1 Bd7 12. Nc4 b5 13. Nxc6 Bxc6 14. Nd2 d5 15. Bd3 Rd8 16. Qe2 0-0 17. Bb1 Bb7 18. Qf2 Rc8 19. Rfe1 dxe4 20. Bb6 Qxb6 21. Qxb6 Bc5+ 22. Qxc5 Rxc5 23. Bxe4 Bd5 24. Bxd5 Rxd5 25. Ne4 Nxe4 26. fxe4 Rd2 27. Rb1 Rfd8 28. Kf1 Rc2 29. Re2 Rdd2 30. Rxd2 Rxd2 31. a3 Kf8 32. b4 Rd3 33. Rb3 Re3 34. a4 Rxe4 35. axb5 axb5 36. Ra3 Rf4+ 37. Ke2 Ke7 38. Ke3 Rf5 39. Ra5 Kd6 40. c4 bxc4 41. Rxf5 exf5 42. Kd4 f4 43. Kxc4 g5 44. b5 g4 45. Kd4 f5 46. Kd3 Kc5 47. b6 Kxb6 48. h3 h5 49. Kd4 f3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.11"]
[Round "4"]
[White "Postma, Jan"]
[Black "De Jeu, Marcel"]
[Result "1/2-1/2"]
[ECO "B09"]
[PlyCount "37"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Bd3 0-0 6. Nf3 Na6 7. Qe2 c5 8. d5 Nc7 9. 0-0 Rb8 10. a4 Bg4 11. Nb5 a6 12. Nxc7 Qxc7 13. c4 b5 14. cxb5 axb5 15. axb5 Rfc8 16. Bc4 Nd7 17. Ra6 Nb6 18. b3 e6 19. Bb2 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.04"]
[Round "3"]
[White "Zeevaarder, Michael"]
[Black "Postma, Jan"]
[Result "1/2-1/2"]
[ECO "B23"]
[PlyCount "22"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. g3 d6 4. Bg2 Bd7 5. d3 Nc6 6. Be3 a6 7. Qd2 Be7 8. Nge2 Nf6 9. h3 Qc7 10. 0-0 Rd8 11. f4 Bc8 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.05.28"]
[Round "2"]
[White "Postma, Jan"]
[Black "Schoonman, Ivo"]
[Result "1-0"]
[ECO "B00"]
[PlyCount "57"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 Nc6 2. d4 e5 3. d5 Nce7 4. Nf3 Ng6 5. c4 Bc5 6. Nc3 Nf6 7. h3 d6 8. b4 Bb6 9. g3 Bd7 10. Bg2 a5 11. b5 Bc5 12. Qe2 Bb4 13. Bd2 b6 14. 0-0 Qc8 15. Kh2 h5 16. Ne1 h4 17. g4 Bxc3 18. Bxc3 Nf4 19. Qe3 Bxg4 20. Rg1 Bd7 21. Nd3 Nxg2 22. Rxg2 Rh7 23. Rag1 g6 24. f4 exf4 25. Nxf4 Qd8 26. e5 Qe7 27. e6 Kf8 28. Rxg6 fxg6 29. Nxg6+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.05.21"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2079"]
[PlyCount "69"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4 e6 5. 0-0 Nf6 6. b3 cxd4 7. Nxd4 Nxd4 8. Qxd4 Qc7 9. Bb2 Bd7 10. c4 dxc4 11. Rc1 Bc5 12. Qh4 Be7 13. Rxc4 Bc6 14. Qg5 0-0 15. Rg4 Ne8 16. Qe3 Bf6 17. Bxf6 Nxf6 18. Rc4 Qd7 19. Bxc6 bxc6 20. Qc1 Rfd8 21. Nc3 Rac8 22. Qa3 Nd5 23. Ne4 Nb6 24. Rcc1 Nd5 25. Rc2 Qe7 26. Qc5 Rc7 27. Rac1 Qxc5 28. Rxc5 Nb4 29. a3 Na6 30. Rxc6 Rxc6 31. Rxc6 Nb8 32. Rc7 a6 33. Nc5 g6 34. Ra7 Kg7 35. Nxe6+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.28"]
[Round "7"]
[White "Postma, Jan"]
[Black "De Leur, Ben"]
[Result "0-1"]
[ECO "B20"]
[WhiteElo "1742"]
[BlackElo "2060"]
[PlyCount "103"]
[EventDate "2011.05.17"]
[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 g6 3. c4 Bg7 4. Nc3 Nc6 5. d3 Nf6 6. Be2 0-0 7. 0-0 d6 8. Rb1 Bg4 9. Ne1 Bd7 10. Nc2 Nd4 11. Nxd4 cxd4 12. Nd5 Ne8 13. Bg5 f6 14. Bd2 e6 15. Nb4 Qe7 16. Nc2 f5 17. f4 a5 18. Bf3 Bc6 19. Qe2 e5 20. exf5 gxf5 21. Nxd4 Bxf3 22. Nxf3 e4 23. Rfe1 d5 24. d4 Qc7 25. Ne5 dxc4 26. Rec1 b5 27. b3 Nd6 28. bxc4 bxc4 29. Be3 Rfc8 30. Rc3 Qe7 31. Rb6 Rc7 32. Qb2 Bf8 33. Qf2 Qd8 34. Bc1 Rg7 35. Rb2 Rc7 36. Be3 Qe8 37. Qe2 Rac8 38. Bd2 Qa4 39. Rg3+ Bg7 40. Bc3 Nb5 41. Qd2 Rd8 42. Rxb5 Qxb5 43. Bxa5 Qb1+ 44. Kf2 Rb8 45. Bc3 Ra7 46. Rxg7+ Rxg7 47. d5 Ra7 48. Kg3 Rg7+ 49. Kf2 Qh1 50. Ke3 Rxg2 51. Qe1 Qxe1+ 52. Bxe1 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.21"]
[Round "6"]
[White "De Ruyter, Wim"]
[Black "Postma, Jan"]
[Result "0-1"]
[ECO "A05"]
[WhiteElo "1591"]
[BlackElo "1742"]
[PlyCount "124"]
[EventDate "2011.05.17"]
[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. Nc3 e6 3. g3 b6 4. Bg2 Bb7 5. d3 Nf6 6. Nf3 d6 7. 0-0 Be7 8. Re1 0-0 9. Bg5 Nfd7 10. h4 Nc6 11. Qd2 Nde5 12. a3 Nxf3+ 13. Bxf3 Nd4 14. Bg2 Bxg5 15. hxg5 Qd7 16. f4 f5 17. Ne2 Nxe2+ 18. Qxe2 Rae8 19. e5 d5 20. c4 Rd8 21. Rad1 Qc7 22. b3 Rd7 23. Kf2 Rfd8 24. Rh1 g6 25. g4 dxc4 26. dxc4 Bxg2 27. Kxg2 Rd4 28. Kg3 Qd7 29. Rxd4 Qxd4 30. gxf5 exf5 31. Rf1 Kg7 32. Qf3 Rd7 33. Re1 Qd2 34. Re3 Qd4 35. e6 Re7 36. Re5 Qg1+ 37. Kh3 h6 38. Rd5 hxg5 39. Qc3+ Kh7 40. fxg5 Qxg5 41. Rd7 Qg4+ 42. Kh2 Qe2+ 43. Kg1 Qxe6 44. Qh3+ Kg7 45. Qc3+ Kf7 46. Rd5 Qe3+ 47. Qxe3 Rxe3 48. Rd7+ Re7 49. Rd3 a5 50. Kf2 Kf6 51. Kf3 g5 52. Rd8 f4 53. Rd5 Re3+ 54. Kg4 Rg3+ 55. Kh5 Rxb3 56. Rxg5 Rh3+ 57. Kg4 Rg3+ 58. Kxf4 Rxg5 59. Ke4 Ke6 60. Kf4 Rg2 61. Ke4 Rd2 62. Ke3 Rd4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.07"]
[Round "4"]
[White "Postma, Jan"]
[Black "Kuiper, Machiel"]
[Result "1-0"]
[ECO "B84"]
[WhiteElo "1742"]
[BlackElo "1263"]
[PlyCount "119"]
[EventDate "2011.05.17"]
[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 Nf6 5. Nc3 e6 6. Be2 a6 7. a4 Be7 8. 0-0 0-0 9. Be3 Nbd7 10. f4 Re8 11. Qd2 Nf8 12. Bf3 Qc7 13. Nde2 Bd7 14. a5 Bc6 15. Bb6 Qb8 16. Ng3 N8d7 17. Be3 b5 18. axb6 Nxb6 19. b3 Nbd7 20. e5 Bxf3 21. exf6 Bxg2 22. Qxg2 Bxf6 23. Nge4 Be7 24. Na4 d5 25. Ng5 Bd6 26. Qd2 Nf6 27. Bd4 Nh5 28. Nh3 Qd8 29. Qf2 e5 30. fxe5 Bxe5 31. Qxf7+ Kh8 32. Qxh5 Bxd4+ 33. Kh1 Bxa1 34. Rxa1 Qf6 35. Ng5 h6 36. Rg1 Kg8 37. Nf3 Re3 38. Qxd5+ Kh7 39. Qxa8 Rxf3 40. Qe4+ g6 41. Rxg6 Qxg6 42. Qxf3 Qxc2 43. Qf7+ Kh8 44. Qf6+ Kh7 45. Qc3 Qe2 46. Qc7+ Kg6 47. Qc6+ Kh7 48. Qc7+ Kg6 49. Qg3+ Kh7 50. h4 Qf1+ 51. Kh2 Qe2+ 52. Kg1 Qd1+ 53. Kg2 Qc2+ 54. Kh3 Qc6 55. Qd3+ Kg7 56. Qc3+ Qxc3+ 57. Nxc3 Kf6 58. Na4 Ke5 59. Nc5 a5 60. Nb7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.06.01"]
[Round "3"]
[White "Geertsma, Folkert Jan"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "D35"]
[WhiteElo "1976"]
[BlackElo "1742"]
[PlyCount "19"]
[EventDate "2011.05.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e6 2. Nc3 Nf6 3. Nf3 d5 4. cxd5 exd5 5. d4 c6 6. Bf4 Be7 7. e3 0-0 8. Qc2 Re8 9. Bd3 Ne4 10. Nxe4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.05.24"]
[Round "2"]
[White "Bingen, Stanley"]
[Black "Postma, Jan"]
[Result "0-1"]
[ECO "B40"]
[WhiteElo "1261"]
[BlackElo "1742"]
[PlyCount "108"]
[EventDate "2011.05.17"]
[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. c3 e6 3. Nf3 Nf6 4. d3 d5 5. e5 Nfd7 6. Bf4 Nc6 7. Be2 Qc7 8. d4 a6 9. 0-0 Be7 10. Qc2 0-0 11. Bd3 h6 12. Nbd2 c4 13. Be2 b5 14. Rfe1 a5 15. Nf1 Ba6 16. Qd2 Rfb8 17. Ng3 Qd8 18. Bxh6 gxh6 19. Qxh6 Bf8 20. Qh5 Qe7 21. Ng5 f6 22. Qg6+ Qg7 23. Qxg7+ Bxg7 24. Nxe6 fxe5 25. Nc7 Ra7 26. Nxd5 Nf6 27. Nxf6+ Bxf6 28. Bf3 Ne7 29. dxe5 Bg7 30. Rad1 b4 31. Rd4 Bb5 32. Rg4 Be8 33. e6 bxc3 34. bxc3 Ra6 35. Rxc4 Rbb6 36. Bg4 Rc6 37. Rxc6 Rxc6 38. Ne2 Rc5 39. Rd1 Bb5 40. Nd4 Ba4 41. Rd3 Bxd4 42. Rxd4 Rxc3 43. Rd8+ Kg7 44. h4 Bc6 45. f4 Rc1+ 46. Kh2 Rc2 47. Bh3 Rxa2 48. Rd6 a4 49. Bg4 Rxg2+ 50. Kh3 Rc2 51. Rd3 Ra2 52. Rg3 Kf6 53. h5 Ra1 54. h6 Rh1# 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2011.05.17"]
[Round "1"]
[White "Postma, Jan"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1742"]
[BlackElo "2076"]
[PlyCount "52"]
[EventDate "2011.05.17"]
[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 e6 2. d4 d5 3. Bd3 dxe4 4. Bxe4 Nf6 5. Bd3 Bd7 6. Nf3 c5 7. 0-0 Nc6 8. dxc5 Bxc5 9. c3 h6 10. Nbd2 Qc7 11. Qe2 0-0-0 12. Nc4 Nd5 13. Nfe5 Be8 14. Nxc6 Bxc6 15. a4 Be7 16. Ne5 Bg5 17. g3 Be8 18. Bxg5 hxg5 19. a5 f6 20. Nc4 Kb8 21. Ne3 Bh5 22. f3 Qc5 23. Rfe1 f5 24. Kg2 Nxe3+ 25. Qxe3 Qxe3 26. Rxe3 f4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.29"]
[Round "7"]
[White "Bakker, Joop"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "A03"]
[WhiteElo "1942"]
[BlackElo "1745"]
[PlyCount "68"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. f4 d5 2. b3 c5 3. e3 Nc6 4. Bb5 Bd7 5. Nf3 Nf6 6. Bb2 e6 7. 0-0 a6 8. Bxc6 Bxc6 9. Ne5 Qc7 10. d3 h5 11. Nd2 b6 12. Nxc6 Qxc6 13. Nf3 Be7 14. Ne5 Qb7 15. Qf3 g6 16. Qh3 Rg8 17. a4 Nd7 18. Rae1 Bf6 19. e4 d4 20. Nc4 Be7 21. f5 e5 22. fxg6 Rxg6 23. Rf5 f6 24. Qxh5 Nf8 25. Rxf6 Bxf6 26. Nd6+ Kd7 27. Nxb7 Re8 28. Rf1 Re7 29. a5 Kc7 30. axb6+ Kxb7 31. Ba3 Kxb6 32. b4 Rh7 33. bxc5+ Kc7 34. Qf5 Rhg7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.22"]
[Round "6"]
[White "Postma, Jan"]
[Black "Zeevaarder, Michael"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1745"]
[BlackElo "1810"]
[PlyCount "73"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Bd3 c5 4. c3 Qb6 5. dxc5 Bxc5 6. Qe2 a5 7. exd5 Nf6 8. Nd2 0-0 9. Nc4 Qc7 10. d6 Bxd6 11. Nxd6 Qxd6 12. Bg5 e5 13. 0-0-0 Qe7 14. h4 h6 15. f4 Re8 16. fxe5 hxg5 17. exf6 Qxe2 18. Bxe2 gxf6 19. hxg5 fxg5 20. Bb5 Nc6 21. Rd5 f6 22. Nf3 Be6 23. Rd6 Rad8 24. Rhd1 Rxd6 25. Rxd6 Kf7 26. Bxc6 bxc6 27. Rxc6 Bxa2 28. Rc7+ Kg6 29. Kd2 Rb8 30. Kc1 a4 31. Ra7 Bb3 32. Nd4 Rh8 33. Nxb3 axb3 34. Re7 Rh1+ 35. Kd2 Rb1 36. c4 Rxb2+ 37. Kc3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.15"]
[Round "5"]
[White "Volders, Wessel"]
[Black "Postma, Jan"]
[Result "1/2-1/2"]
[ECO "B27"]
[WhiteElo "1851"]
[BlackElo "1745"]
[PlyCount "53"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 b6 3. Nc3 Bb7 4. Bc4 e6 5. 0-0 a6 6. a4 d6 7. Re1 Be7 8. d4 cxd4 9. Nxd4 Qc8 10. Bb3 Nc6 11. Be3 Nf6 12. Nxc6 Qxc6 13. f3 0-0 14. Qd2 Nd7 15. Qf2 Ne5 16. Bxb6 Nc4 17. Bxc4 Qxc4 18. a5 Rac8 19. Ra4 Qc6 20. Rd1 Qd7 21. Rad4 Rc6 22. R4d3 Rfc8 23. Bd4 Qc7 24. Qg3 Bf8 25. Kh1 Qxa5 26. h4 Qh5 27. Qg5 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.08"]
[Round "4"]
[White "Postma, Jan"]
[Black "Straver, Robert"]
[Result "0-1"]
[ECO "B07"]
[WhiteElo "1745"]
[BlackElo "2110"]
[PlyCount "88"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. dxe5 dxe5 5. Qxd8+ Kxd8 6. Bc4 Be6 7. Bxe6 fxe6 8. Nf3 Nc6 9. Bg5 Bb4 10. Ke2 Ke7 11. Rad1 Rhd8 12. Rd3 a6 13. Rhd1 Rd6 14. Rxd6 cxd6 15. Nb1 h6 16. Bxf6+ gxf6 17. c3 Bc5 18. Nbd2 b5 19. Nb3 Bb6 20. a3 a5 21. Ra1 d5 22. exd5 exd5 23. Ne1 a4 24. Nd2 Ke6 25. Nc2 Rc8 26. Rf1 f5 27. f3 h5 28. Rd1 h4 29. g3 d4 30. cxd4 Nxd4+ 31. Nxd4+ Bxd4 32. Kd3 hxg3 33. hxg3 Bxb2 34. Rb1 Rc3+ 35. Ke2 Bxa3 36. Rxb5 Bc1 37. Nb1 Rc2+ 38. Kd3 Rf2 39. Rb6+ Kf7 40. Rc6 Bb2 41. Nd2 a3 42. Ra6 Bc1 43. Nc4 Rxf3+ 44. Kc2 Bb2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.06.01"]
[Round "3"]
[White "Scherpenisse, Kees"]
[Black "Postma, Jan"]
[Result "1/2-1/2"]
[ECO "D30"]
[WhiteElo "1915"]
[BlackElo "1745"]
[PlyCount "30"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 e6 2. c4 d5 3. Nf3 c6 4. e3 Nf6 5. b3 Bb4+ 6. Bd2 Be7 7. Bd3 0-0 8. Ne5 Nbd7 9. Nc3 Nxe5 10. dxe5 Nd7 11. f4 f6 12. exf6 Bxf6 13. 0-0 Nc5 14. Bc2 d4 15. exd4 Bxd4+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2010.05.18"]
[Round "1"]
[White "Oosterom, Erik"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "A40"]
[WhiteElo "2038"]
[BlackElo "1745"]
[PlyCount "67"]
[EventDate "2010.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. Nf3 Bb7 4. a3 c5 5. d5 Qc7 6. Nc3 a6 7. e4 e5 8. Bd3 Nf6 9. 0-0 Be7 10. Nh4 d6 11. Nf5 Bf8 12. b4 Nbd7 13. Na4 h5 14. bxc5 bxc5 15. f4 g6 16. Nh4 exf4 17. Bxf4 Bg7 18. Rb1 Ng4 19. Nf3 Nge5 20. Nxe5 Nxe5 21. Nb6 0-0 22. Nxa8 Rxa8 23. Qb3 Bc8 24. Be2 Ng4 25. Bxg4 Bxg4 26. Qb6 Bd4+ 27. Kh1 Qxb6 28. Rxb6 Be2 29. Re1 Bxc4 30. Bxd6 Kg7 31. Rc6 Re8 32. Bxc5 Bxc5 33. Rxc5 Bd3 34. e5 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.23"]
[Round "6"]
[White "Landsheer, Jos"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "B21"]
[WhiteElo "1704"]
[BlackElo "1668"]
[PlyCount "95"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 a6 5. Nf3 Nc6 6. Bc4 e6 7. 0-0 d6 8. Qe2 Be7 9. Bf4 Nf6 10. e5 Nh5 11. Be3 dxe5 12. Rfd1 Qc7 13. Rac1 Nf6 14. Bb3 0-0 15. Na4 Bd7 16. Nb6 Rad8 17. Nc4 Qb8 18. Bb6 Rc8 19. Nfxe5 Nxe5 20. Nxe5 Bb5 21. Qe3 Rxc1 22. Rxc1 Bd6 23. Ba7 Qe8 24. Rd1 Bxe5 25. Qxe5 Qc6 26. Bd4 Rc8 27. Qg5 Ne8 28. Be3 Ba4 29. Rc1 Qd7 30. Rxc8 Bxb3 31. Rxe8+ Qxe8 32. axb3 f6 33. Qc5 Qd7 34. Qd4 Qb5 35. Qc3 Qe2 36. h3 Qd1+ 37. Kh2 Qd6+ 38. g3 Qd5 39. b4 Kf7 40. Qd4 Qc6 41. Qd3 Qe8 42. Qxh7 Qc6 43. Bh6 Qf3 44. Qxg7+ Ke8 45. Qf8+ Kd7 46. Qf7+ Kd8 47. Be3 e5 48. Bb6+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.16"]
[Round "5"]
[White "Postma, Jan"]
[Black "Van Briemen, Willem Jan"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1668"]
[BlackElo "1894"]
[PlyCount "20"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Bd3 Nf6 4. e5 Nfd7 5. f4 c5 6. c3 Nc6 7. Nf3 Qb6 8. Bc2 f6 9. a3 a5 10. Ba4 Be7 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.09"]
[Round "4"]
[White "Van den Berg, Ad"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "B40"]
[WhiteElo "2185"]
[BlackElo "1668"]
[PlyCount "79"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. b3 Qc7 4. Bb2 Nc6 5. g3 d6 6. Bg2 Nf6 7. Nc3 a6 8. 0-0 Be7 9. d4 cxd4 10. Nxd4 Bd7 11. a4 0-0 12. Nde2 Rab8 13. Nf4 Nb4 14. Re1 Rfd8 15. Qd2 a5 16. Rac1 b5 17. axb5 Bxb5 18. Nxb5 Rxb5 19. c4 Rbb8 20. Ra1 Nc6 21. Bxf6 Bxf6 22. Rab1 Qb6 23. h4 Qb4 24. Qa2 Bd4 25. Red1 Qb6 26. Nd3 Ne5 27. Nxe5 Bxe5 28. Kh2 Bd4 29. f4 Bf2 30. Rd3 Bc5 31. Rbd1 f6 32. Qe2 e5 33. Qg4 Qc7 34. Bh3 Qe7 35. h5 Qf8 36. h6 g6 37. fxe5 fxe5 38. Rf3 Qe7 39. Rdf1 Rf8 40. Qe6+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.02"]
[Round "3"]
[White "Postma, Jan"]
[Black "Lauer, Albert"]
[Result "1-0"]
[ECO "B12"]
[WhiteElo "1668"]
[BlackElo "1781"]
[PlyCount "97"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nd2 Nd7 4. e5 e6 5. f4 c5 6. Ngf3 cxd4 7. Nxd4 Bc5 8. N2b3 Ne7 9. c3 a6 10. Nxc5 Nxc5 11. Be3 Qc7 12. Be2 0-0 13. 0-0 Nf5 14. Nxf5 exf5 15. Qxd5 Ne4 16. Qc4 Qe7 17. Bf3 b5 18. Qe2 f6 19. Bd4 fxe5 20. fxe5 Bb7 21. a4 bxa4 22. Rxa4 a5 23. Rfa1 Qc7 24. Qc4+ Qxc4 25. Rxc4 Rfc8 26. Rca4 Rab8 27. Rxa5 Nd2 28. Bxb7 Rxb7 29. Ra8 Rcb8 30. Rxb8+ Rxb8 31. b4 Nb3 32. Rd1 Kf7 33. Kf2 Ke6 34. Ke3 Nxd4 35. Rxd4 Kxe5 36. h3 g5 37. Rc4 Rb5 38. Rc5+ Rxc5 39. bxc5 Kd5 40. c6 Kxc6 41. Kd4 Kd6 42. c4 h5 43. c5+ Ke6 44. c6 g4 45. Kc5 f4 46. Kb6 f3 47. gxf3 g3 48. c7 g2 49. c8Q+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.05.19"]
[Round "1"]
[White "Mourits, Wilbert"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "B49"]
[WhiteElo "2023"]
[BlackElo "1668"]
[PlyCount "59"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Nc6 6. Be2 Qc7 7. 0-0 Nf6 8. Be3 b5 9. Nxc6 dxc6 10. a3 Be7 11. f4 0-0 12. Qe1 Bb7 13. Bf3 Rad8 14. e5 Nd5 15. Nxd5 cxd5 16. Qf2 Rc8 17. c3 Qd7 18. Bd4 a5 19. b4 a4 20. Qg3 f6 21. exf6 Bxf6 22. Bc5 Bxc3 23. Rad1 Rxc5 24. bxc5 Qc7 25. Qf2 Rxf4 26. Qe3 Be5 27. Rfe1 Re4 28. Bxe4 Bxh2+ 29. Kh1 dxe4 30. Qh3 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.07.01"]
[Round "7"]
[White "Postma, Jan"]
[Black "Brouwer, Pieter"]
[Result "1-0"]
[ECO "C91"]
[WhiteElo "1719"]
[BlackElo "1649"]
[PlyCount "91"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. d4 Bg4 10. d5 Nb8 11. Nbd2 Nbd7 12. h3 Bh5 13. Nf1 Re8 14. Ng3 Bg6 15. Qe2 Nh5 16. Nxh5 Bxh5 17. Bc2 Bxf3 18. Qxf3 Bg5 19. Qe2 Bxc1 20. Rexc1 Nf6 21. a4 Qd7 22. Bd3 Rab8 23. axb5 axb5 24. Ra5 b4 25. Bb5 c6 26. Bxc6 Qc7 27. Bxe8 Qxa5 28. Bc6 bxc3 29. Rxc3 Qa2 30. Rc2 Nh5 31. g3 Nf6 32. Bb5 Kf8 33. Bd3 g6 34. Kg2 Rb4 35. Bc4 Qa7 36. Qd3 Qb6 37. b3 Kg7 38. g4 Nd7 39. Rc3 Nc5 40. Qe3 Qd8 41. f4 f6 42. fxe5 fxe5 43. Rc2 Qh4 44. Rf2 h5 45. Qf3 hxg4 46. Qf8+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.24"]
[Round "6"]
[White "Siero, Paul"]
[Black "Postma, Jan"]
[Result "0-1"]
[ECO "B46"]
[WhiteElo "1150"]
[BlackElo "1719"]
[PlyCount "54"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Nc6 6. Be2 Bb4 7. 0-0 Qc7 8. a3 Ba5 9. b4 Bb6 10. Nxc6 Qxc6 11. Bd2 Bd4 12. Qe1 Ne7 13. Rb1 b5 14. Kh1 Bb7 15. Bd3 0-0 16. f3 Rac8 17. Ne2 Bb6 18. c3 Qd6 19. Nc1 f5 20. exf5 Nxf5 21. Bxf5 Rxf5 22. Ne2 Rc4 23. Ng3 Re5 24. Qc1 Qe7 25. Qc2 Qh4 26. Be1 Qxh2+ 27. Kxh2 Rh4# 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.17"]
[Round "5"]
[White "Postma, Jan"]
[Black "De Ruyter, Wim"]
[Result "0-1"]
[ECO "C42"]
[WhiteElo "1719"]
[BlackElo "1538"]
[PlyCount "50"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. 0-0 Nc6 8. c3 Bg4 9. Nbd2 f5 10. Qc2 0-0 11. Ne5 Nxe5 12. dxe5 Bc5 13. Nb3 Bb6 14. Kh1 Qh4 15. Nd4 c5 16. Nb5 c4 17. Bxe4 fxe4 18. Nd4 Bc7 19. Qd2 Bxe5 20. g3 Bxg3 21. f4 exf3 22. Nxf3 Rxf3 23. Rxf3 Bxf3+ 24. Kg1 Re8 25. hxg3 Qh1+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.10"]
[Round "4"]
[White "Volders, Wessel"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "1925"]
[BlackElo "1719"]
[PlyCount "97"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Be7 4. d4 d6 5. c3 Nf6 6. 0-0 0-0 7. Re1 h6 8. h3 Nh7 9. Nbd2 Ng5 10. Nxg5 Bxg5 11. Nf3 Bf6 12. a3 Kh7 13. b4 a6 14. Qb3 Qe7 15. Bb2 Bd7 16. Rad1 Rad8 17. Bd3 g5 18. Nh2 Rg8 19. Be2 Bg7 20. Bh5 Rgf8 21. d5 Nb8 22. c4 f5 23. Bf3 Kh8 24. exf5 Bxf5 25. Be4 Nd7 26. Bxf5 Rxf5 27. Ng4 Rdf8 28. f3 h5 29. Nf2 R5f6 30. Qe3 Rg6 31. Bc1 Bh6 32. Qa7 Rb8 33. c5 dxc5 34. bxc5 Rgg8 35. d6 Qd8 36. c6 Nb6 37. cxb7 cxd6 38. Qxa6 Qc7 39. Ne4 Bf8 40. Bxg5 Nc4 41. Rc1 d5 42. Bf6+ Bg7 43. Ng5 Qc5+ 44. Kh1 Qf8 45. Bxg7+ Qxg7 46. h4 Rxb7 47. Rb1 Rd7 48. Qe6 Rc8 49. Qa6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.06.03"]
[Round "3"]
[White "Postma, Jan"]
[Black "Verheijen, Jan"]
[Result "1-0"]
[ECO "B38"]
[WhiteElo "1719"]
[BlackElo "1598"]
[PlyCount "79"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 c5 2. c4 d6 3. Nc3 Nf6 4. Nf3 Nc6 5. d4 cxd4 6. Nxd4 g6 7. Be2 Bg7 8. Be3 0-0 9. 0-0 Bd7 10. Rc1 Rc8 11. b3 Re8 12. f3 Nh5 13. Nxc6 Rxc6 14. g4 Nf6 15. Nb5 Qa5 16. a3 a6 17. b4 Qd8 18. Na7 Rb6 19. Qd4 Rc6 20. Nxc6 Bxc6 21. Qd3 Nd7 22. f4 e5 23. f5 Nf6 24. Bf3 h5 25. g5 Ng4 26. Bxg4 hxg4 27. f6 Bf8 28. Rfd1 b6 29. c5 Qa8 30. cxd6 Bxe4 31. Qf1 Bd5 32. Bxb6 Bxd6 33. Bc5 Bxc5+ 34. Rxc5 Bf3 35. Rd6 Qe4 36. Rd2 Ra8 37. Rc1 Kf8 38. Qf2 Qb7 39. Qc5+ Ke8 40. Rc3 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.05.27"]
[Round "2"]
[White "Hortensius, Nick"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "1606"]
[BlackElo "1719"]
[PlyCount "64"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 c5 2. c3 e6 3. d4 d5 4. e5 Nc6 5. Nf3 Qc7 6. a3 a5 7. a4 Bd7 8. Na3 Rc8 9. Nb5 Qb8 10. Be2 Na7 11. Bd2 Nxb5 12. Bxb5 Bxb5 13. axb5 b6 14. 0-0 c4 15. b3 Be7 16. bxc4 Rxc4 17. Ra4 Qc7 18. Qb3 Rxa4 19. Qxa4 Bd8 20. Rc1 Ne7 21. c4 dxc4 22. Qxc4 Qd7 23. Bg5 0-0 24. h3 h6 25. Bh4 g5 26. Bg3 Nd5 27. Nd2 Nc7 28. Rb1 Be7 29. Ne4 Rc8 30. Rc1 Kg7 31. Nd6 Nxb5 32. Qxc8 Qa7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2003.05.20"]
[Round "1"]
[White "Postma, Jan"]
[Black "Van der Marel, Eric J"]
[Result "0-1"]
[ECO "C86"]
[WhiteElo "1719"]
[BlackElo "1964"]
[PlyCount "60"]
[EventDate "2003.05.20"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 095 Extra"]
[Source "ChessBase"]
[SourceDate "2003.09.04"]
[SourceVersion "1"]
[SourceVersionDate "2003.09.04"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Qe2 b5 7. Bb3 0-0 8. c3 d6 9. d4 Bg4 10. d5 Na5 11. Bc2 c6 12. b4 cxd5 13. Bg5 dxe4 14. Bxf6 gxf6 15. bxa5 exf3 16. gxf3 Bh5 17. Be4 Kh8 18. Rd1 Rg8+ 19. Kf1 Qc8 20. Bxa8 Qh3+ 21. Ke1 Rxa8 22. Rd3 f5 23. Nd2 Rg8 24. Nf1 Rg1 25. Kd2 e4 26. Ng3 Bg5+ 27. Kc2 exd3+ 28. Qxd3 Rxa1 29. Nxf5 Qxf5 30. Qxf5 Bg6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.07.02"]
[Round "7"]
[White "De Waard, Ad"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "1331"]
[BlackElo "1766"]
[PlyCount "69"]
[EventDate "2002.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 c5 2. c3 e6 3. d4 d5 4. e5 Nc6 5. Nf3 Be7 6. Bd3 Qb6 7. 0-0 Bd7 8. Bc2 f6 9. Re1 0-0-0 10. Na3 a6 11. c4 cxd4 12. cxd5 exd5 13. e6 Be8 14. Bb3 Bh5 15. Bd2 Kb8 16. Rc1 Bc5 17. Bf4+ Ka8 18. Re2 Nge7 19. Ba4 g5 20. Bg3 Bg6 21. Bc7 Qxc7 22. Rxc5 Qf4 23. Bxc6 Nxc6 24. Rd2 Bh5 25. Rxc6 Bxf3 26. Rxa6+ bxa6 27. gxf3 Qe5 28. Re2 Qf4 29. e7 Rde8 30. Re6 Ka7 31. Qa4 Qc1+ 32. Kg2 Qc8 33. Nb5+ Kb8 34. Rxa6 Qd7 35. Ra8+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.06.25"]
[Round "6"]
[White "Postma, Jan"]
[Black "Van Dorp, Quirinius"]
[Result "0-1"]
[ECO "C77"]
[WhiteElo "1766"]
[BlackElo "1947"]
[PlyCount "82"]
[EventDate "2002.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Qe2 b5 6. Bb3 Bc5 7. c3 0-0 8. 0-0 d6 9. d3 h6 10. Be3 Ba7 11. Nbd2 Bg4 12. Bd5 Nxd5 13. exd5 Ne7 14. c4 f5 15. Bxa7 Rxa7 16. h3 Bh5 17. b3 c6 18. dxc6 Nxc6 19. Qe3 Qa8 20. d4 e4 21. Ne1 Re7 22. Nc2 f4 23. Qc3 Be2 24. Rfe1 Bd3 25. Nb4 Nxb4 26. Qxb4 Rf6 27. Qc3 Qe8 28. f3 Qg6 29. Nxe4 Bxe4 30. Re2 Bxf3 31. Qxf3 Rxe2 32. Qxe2 f3 33. Qf2 Qd3 34. g3 bxc4 35. bxc4 Re6 36. Re1 Re2 37. Rxe2 fxe2 38. Qe1 Qxd4+ 39. Kg2 Qxc4 40. Kf2 Qd4+ 41. Kf3 Qd1 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.06.18"]
[Round "5"]
[White "Janssen, Arthur"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "B45"]
[WhiteElo "1828"]
[BlackElo "1766"]
[PlyCount "59"]
[EventDate "2002.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 a6 6. Be3 Bb4 7. Qd2 Nf6 8. f3 0-0 9. g4 Qc7 10. a3 Bc5 11. Nxc6 Qxc6 12. 0-0-0 Bxe3 13. Qxe3 d6 14. Qd3 Ne8 15. Be2 b5 16. f4 Rb8 17. f5 b4 18. axb4 Rxb4 19. g5 Qc5 20. Rhf1 Bb7 21. h4 Qa5 22. b3 Qa3+ 23. Kb1 Qa5 24. fxe6 fxe6 25. Rf3 Qe5 26. Rdf1 Rxf3 27. Qxf3 Nf6 28. gxf6 Bxe4 29. Nxe4 Rxe4 30. fxg7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.06.11"]
[Round "4"]
[White "Postma, Jan"]
[Black "Vernooy, Daan"]
[Result "1-0"]
[ECO "B40"]
[WhiteElo "1766"]
[BlackElo "1511"]
[PlyCount "56"]
[EventDate "2002.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. c4 e6 4. Nc3 Nge7 5. d3 d5 6. Bf4 a6 7. Be2 d4 8. Nb1 Ng6 9. Bg3 Bd6 10. 0-0 Nf4 11. Bxf4 Bxf4 12. g3 Bd6 13. Ne1 e5 14. Bg4 0-0 15. Nd2 Qg5 16. Bxc8 Raxc8 17. Ng2 Qd8 18. f4 exf4 19. Nxf4 Ne5 20. Qe2 Qg5 21. Nd5 Qg4 22. Nf3 Rce8 23. Rae1 Nxf3+ 24. Rxf3 f6 25. Qg2 Be5 26. Ref1 Qe6 27. Qc2 Qc6 28. a3 Rb8 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.05.21"]
[Round "1"]
[White "Postma, Jan"]
[Black "Van Baardewijk, Frans"]
[Result "0-1"]
[ECO "B33"]
[WhiteElo "1766"]
[PlyCount "94"]
[EventDate "2002.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nb3 Bb4 7. Bg5 h6 8. Bxf6 Qxf6 9. Bd3 d6 10. 0-0 Bxc3 11. bxc3 0-0 12. Qd2 Qf4 13. Rfd1 Be6 14. Qe2 Rac8 15. Rd2 Rc7 16. Rb1 Qf6 17. Bb5 Bc8 18. Rbd1 Rd8 19. Rd3 a6 20. Rf3 Qe7 21. Bxc6 Rxc6 22. Rfd3 Be6 23. Qd2 f5 24. exf5 Bxf5 25. Rg3 Kh8 26. Re1 Rc4 27. Nd4 Bh7 28. Qe2 Ra4 29. Qf3 Qd7 30. Ne6 Qxe6 31. Qxb7 Qd7 32. Qb3 Bg8 33. Qb6 Bxa2 34. Rd1 Bg8 35. Rg6 d5 36. h4 Bf7 37. Rxh6+ gxh6 38. Qxh6+ Kg8 39. Qg5+ Kf8 40. Qxe5 Re4 41. Qf6 Qd6 42. Qg5 Rde8 43. g3 Re1+ 44. Rxe1 Rxe1+ 45. Kg2 d4 46. Qd2 Qe6 47. cxd4 Qe4+ 0-1

