[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.12"]
[Round "9"]
[White "Keessen, Aldert Jan"]
[Black "Grochal, Joey"]
[Result "0-1"]
[ECO "D36"]
[WhiteElo "2234"]
[PlyCount "76"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 Be7 6. e3 c6 7. Qc2 Nbd7 8. Bd3 0-0 9. Nge2 Re8 10. 0-0 Nf8 11. f3 Be6 12. Rae1 N6d7 13. Bxe7 Qxe7 14. f4 f6 15. f5 Bf7 16. Nf4 Qd6 17. Qf2 a6 18. Be2 Nb6 19. Bh5 Bxh5 20. Nxh5 Rad8 21. Qh4 Rd7 22. Rf3 Kh8 23. Ne2 Nc4 24. Nef4 Rde7 25. Qg4 Qd7 26. Kf2 Nd6 27. Nd3 Ne4+ 28. Kg1 b6 29. Rh3 c5 30. dxc5 bxc5 31. Ndf4 Re5 32. Ng6+ Nxg6 33. Qxg6 Ng5 34. Rh4 Re4 35. Nf4 Rxf4 36. exf4 Rxe1+ 37. Kf2 Qe7 38. Kg3 Kg8 0-1

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.11"]
[Round "8"]
[White "Kuijpers, Jos"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "A03"]
[WhiteElo "1930"]
[BlackElo "2234"]
[PlyCount "101"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. f4 d5 2. Nf3 g6 3. g3 Bg7 4. Bg2 Nh6 5. 0-0 0-0 6. d3 d4 7. c3 c5 8. Bd2 Nc6 9. Na3 Be6 10. Nc2 Rb8 11. c4 Nf5 12. Rb1 a5 13. a3 b5 14. b3 Qc7 15. g4 Nd6 16. h3 a4 17. cxb5 Rxb5 18. b4 Bb3 19. Qc1 Rfb8 20. Na1 Bd5 21. Qc2 Qa7 22. bxc5 Rxb1 23. Rxb1 Rxb1+ 24. Qxb1 Qxc5 25. Qc1 Qxc1+ 26. Bxc1 Nb5 27. Nd2 Bxg2 28. Kxg2 e5 29. fxe5 Bh6 30. Nc2 Nc3 31. h4 Bf4 32. e3 dxe3 33. Nc4 Nxe5 34. Nxe5 Bxe5 35. Bxe3 Bd6 36. Kf3 Nb5 37. Bc1 f5 38. gxf5 gxf5 39. Bb2 Kf7 40. h5 Ke6 41. Ke3 Bc5+ 42. Kf4 Be7 43. Ke3 Bg5+ 44. Kf3 Bd2 45. Kg3 f4+ 46. Kg4 h6 47. Bg7 Bc1 48. Bf8 Kf7 49. Bxh6 Nxa3 50. Nxa3 Bxa3 51. Bxf4 1/2-1/2

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.10"]
[Round "7"]
[White "Keessen, Aldert Jan"]
[Black "Serdijn, GO."]
[Result "1/2-1/2"]
[ECO "A40"]
[WhiteElo "2234"]
[BlackElo "2098"]
[PlyCount "62"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 b5 2. c4 bxc4 3. e4 e6 4. Bxc4 Bb7 5. Nc3 Bb4 6. Qe2 f5 7. Bd3 Nf6 8. Bg5 fxe4 9. Bxe4 Nxe4 10. Bxd8 Nxc3 11. bxc3 Bxc3+ 12. Kd1 Bxa1 13. Bxc7 0-0 14. Nf3 Bxf3 15. gxf3 Bxd4 16. Be5 Nc6 17. Bxd4 Nxd4 18. Qe4 Nxf3 19. h4 Rac8 20. Rh3 Rc3 21. Rg3 Rf5 22. Qa8+ Kf7 23. Qxa7 Rd5+ 24. Ke2 Re5+ 25. Kf1 Re1+ 26. Kg2 Rg1+ 27. Kh3 Rh1+ 28. Kg2 Rh2+ 29. Kf1 Rh1+ 30. Kg2 Rh2+ 31. Kf1 Rh1+ 1/2-1/2

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.09"]
[Round "6"]
[White "Van den Berg, Ad"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B34"]
[WhiteElo "2175"]
[BlackElo "2234"]
[PlyCount "61"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. Nge2 g6 4. d4 cxd4 5. Nxd4 Bg7 6. Be3 Nf6 7. Be2 0-0 8. f4 d5 9. e5 Ne4 10. Nxe4 dxe4 11. Nxc6 bxc6 12. Qxd8 Rxd8 13. Bc5 Rd7 14. Bc4 Kf8 15. 0-0 Ke8 16. Rae1 Rd2 17. Rf2 Rxf2 18. Kxf2 Bf5 19. Rd1 a5 20. Ke3 a4 21. a3 f6 22. e6 Rd8 23. Rxd8+ Kxd8 24. b3 axb3 25. cxb3 Bf8 26. a4 Kc7 27. a5 Kb7 28. a6+ Ka8 29. b4 g5 30. g3 Bg6 31. b5 1-0

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.08"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Laarhoven, Thijs"]
[Result "1/2-1/2"]
[ECO "E97"]
[WhiteElo "2234"]
[PlyCount "41"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Nf3 e5 7. 0-0 Nc6 8. d5 Ne7 9. b4 Nh5 10. Re1 f5 11. Ng5 Nf6 12. Bf3 c6 13. Be3 h6 14. Ne6 Bxe6 15. dxe6 fxe4 16. Nxe4 Nxe4 17. Bxe4 d5 18. cxd5 cxd5 19. Bc5 dxe4 20. Qxd8 Rfxd8 21. Bxe7 1/2-1/2

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.07"]
[Round "4"]
[White "Michiels, Bart"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B44"]
[WhiteElo "2455"]
[BlackElo "2234"]
[PlyCount "57"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. Na3 b6 9. Be2 Bb7 10. 0-0 Be7 11. Be3 0-0 12. f3 Re8 13. Qd2 d5 14. cxd5 exd5 15. Nxd5 Nxd5 16. Qxd5 Qxd5 17. exd5 Bxa3 18. dxc6 Bxc6 19. Kf2 Bxb2 20. Rab1 Be5 21. Rfc1 Bd5 22. Rxb6 Bxa2 23. Rxa6 Rxa6 24. Bxa6 g6 25. f4 Bf6 26. Bb7 Be6 27. Bf3 h5 28. Rd1 Rc8 29. Rd2 1/2-1/2

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.06"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Van der Wiel, John"]
[Result "1/2-1/2"]
[ECO "E91"]
[WhiteElo "2234"]
[BlackElo "2508"]
[PlyCount "34"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Nf3 Na6 7. 0-0 c6 8. Be3 Ng4 9. Bg5 Nc7 10. Rc1 f6 11. Bh4 Nh6 12. c5 d5 13. Bg3 dxe4 14. Nxe4 Nd5 15. h3 Be6 16. Bc4 Qd7 17. Re1 Bf7 1/2-1/2

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.06"]
[Round "2"]
[White "Straffon Loredo, Othon"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "A96"]
[BlackElo "2234"]
[PlyCount "78"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 f5 2. c4 e6 3. Nf3 Nf6 4. g3 Be7 5. Bg2 0-0 6. 0-0 d6 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3 a5 10. Bd2 Bf6 11. Qc2 Nc6 12. Rfd1 Nxd4 13. Nxd4 Bxd4 14. e3 Bf6 15. Bc3 Bxc3 16. Qxc3 Qf6 17. Rac1 Qxc3 18. Rxc3 Bd7 19. Bxb7 Rab8 20. c5 Rxb7 21. c6 Bxc6 22. Rxc6 Ra8 23. Rd3 Raa7 24. Rd2 Kf7 25. Kf1 Ke7 26. Ke2 Kd7 27. Rdc2 Rb6 28. Rxb6 cxb6 29. Kd3 Rc7 30. Rxc7+ Kxc7 31. f4 e5 32. fxe5 dxe5 33. Kc4 Kc6 34. a4 g5 35. Kd3 Kc5 36. h4 gxh4 37. gxh4 Kb4 38. h5 h6 39. e4 f4 0-1

[Event "Vlissingen HZ op 10th"]
[Site "Vlissingen"]
[Date "2006.08.05"]
[Round "1"]
[White "Keessen, Aldert Jan"]
[Black "Wiering, Jelle"]
[Result "1-0"]
[ECO "D85"]
[WhiteElo "2234"]
[PlyCount "41"]
[EventDate "2006.08.05"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 c5 8. Rb1 0-0 9. Be2 Nc6 10. d5 Bxc3+ 11. Bd2 Bxd2+ 12. Qxd2 Nb8 13. h4 e6 14. e5 exd5 15. h5 Bf5 16. Rxb7 Nc6 17. g4 Be4 18. Qh6 Nxe5 19. Ng5 gxh5 20. Nxe4 Nxg4 21. Qxh5 1-0

[Event "Amsterdam ACT op 3rd"]
[Site "Amsterdam"]
[Date "2006.07.17"]
[Round "3"]
[White "Van Oosterom, Chiel"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "2343"]
[BlackElo "2234"]
[PlyCount "118"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 e6 5. d4 cxd4 6. cxd4 d6 7. Bc4 Nb6 8. Bd3 dxe5 9. dxe5 N8d7 10. 0-0 Nc5 11. Bc2 Qxd1 12. Rxd1 Bd7 13. Nc3 Rc8 14. Be3 Nc4 15. Bc1 Bc6 16. Rd4 Nb6 17. Rf4 Be7 18. Nd4 0-0 19. Rg4 Rfd8 20. Nxc6 Rxc6 21. Bh6 Bf8 22. Bg5 Rd7 23. Rg3 Rd4 24. b3 Ncd7 25. Ne2 Rb4 26. Bb1 Nxe5 27. a3 Rg4 28. Rxg4 Nxg4 29. Be4 Nd5 30. Rd1 h6 31. Bc1 Bc5 32. Rf1 f5 33. Bxd5 exd5 34. h3 Nf6 35. b4 Bb6 36. Be3 Bxe3 37. fxe3 g6 38. Nd4 Rc3 39. g4 Rxe3 40. gxf5 gxf5 41. Nxf5 Rxh3 42. Kg2 Rxa3 43. Nxh6+ Kg7 44. Nf5+ Kf7 45. Nd6+ Ke6 46. Nxb7 Ne4 47. Re1 Kd7 48. Rd1 Nc3 49. Rd4 Kc6 50. Nd8+ Kd6 51. Rd3 Nb1 52. Rd1 Ra2+ 53. Kf3 Nd2+ 54. Ke3 Nc4+ 55. Kd4 Rf2 56. Ra1 Rf4+ 57. Kc3 Rf3+ 58. Kd4 Na3 59. Nf7+ Ke7 1/2-1/2

[Event "Amsterdam ACT op 3rd"]
[Site "Amsterdam"]
[Date "2006.07.16"]
[Round "2"]
[White "Keessen, Aldert Jan"]
[Black "Van der Weide, Karel"]
[Result "0-1"]
[ECO "A38"]
[WhiteElo "2234"]
[BlackElo "2446"]
[PlyCount "114"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c5 3. g3 g6 4. b3 Bg7 5. Bb2 0-0 6. Nc3 Nc6 7. Bg2 e5 8. 0-0 d6 9. Ne1 Be6 10. Nd3 Rc8 11. f4 b6 12. Nd5 Nd7 13. Ne3 Ne7 14. Rf2 f5 15. Qc2 Qc7 16. Rd1 Rf7 17. Qb1 e4 18. Bxg7 Rxg7 19. Ne1 d5 20. cxd5 Nxd5 21. Nxd5 Bxd5 22. d3 Nf6 23. dxe4 Bxe4 24. Bxe4 Nxe4 25. Rf3 c4 26. bxc4 Qxc4 27. Qb3 Qxb3 28. Rxb3 Re7 29. Rb2 Rec7 30. Kg2 Kf8 31. Nf3 Rc2 32. Rxc2 Rxc2 33. Rd7 Rxe2+ 34. Kh3 h6 35. Rxa7 g5 36. fxg5 hxg5 37. g4 f4 38. Rb7 Rb2 39. a4 Nf2+ 40. Kg2 Nxg4+ 41. Kg1 Rb1+ 42. Kg2 Ne3+ 43. Kf2 Rb2+ 44. Ke1 g4 45. Nd2 Rb4 46. Ra7 Nc2+ 47. Kf2 Nd4 48. a5 bxa5 49. Rxa5 Kf7 50. Ra2 Kg6 51. Ne4 Ne6 52. Nc3 Ng5 53. Ra6+ Kh5 54. Nd5 Ne4+ 55. Ke1 Rb1+ 56. Ke2 Rb2+ 57. Ke1 f3 0-1

[Event "Amsterdam ACT op 3rd"]
[Site "Amsterdam"]
[Date "2006.07.15"]
[Round "1"]
[White "Pliester, Leon"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B40"]
[WhiteElo "2391"]
[BlackElo "2234"]
[PlyCount "107"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nf3 Nf6 6. Bd3 Qc7 7. 0-0 a6 8. Re1 d6 9. b3 Be7 10. Bb2 e5 11. c4 Qb8 12. Nc3 Bd8 13. Nd5 Bg4 14. h3 Bxf3 15. Qxf3 0-0 16. Rac1 Nd7 17. Qg3 Qa7 18. Bb1 Re8 19. h4 Re6 20. Qh3 Nf6 21. Qe3 Nd4 22. Bxd4 Qxd4 23. Qxd4 exd4 24. g3 Re8 25. Bd3 Nxd5 26. cxd5 Ba5 27. Re2 Bc3 28. Kg2 Rac8 29. f4 f6 30. Kf3 Kf8 31. g4 h6 32. Rg2 Rc7 33. g5 hxg5 34. hxg5 fxg5 35. Rxg5 Rf7 36. Rc2 Ke7 37. Rcg2 Rh8 38. Rxg7 Rxg7 39. Rxg7+ Kf6 40. Rg3 Be1 41. e5+ dxe5 42. Rg6+ Kf7 43. Ke2 Rh3 44. Kxe1 Rxd3 45. Rb6 exf4 46. Rxb7+ Kf6 47. Rb6+ Ke5 48. d6 Ke6 49. Rxa6 Re3+ 50. Kf2 d3 51. Ra4 Kxd6 52. Rxf4 Re2+ 53. Kf3 Rxa2 54. Rd4+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.07.07"]
[Round "7"]
[White "Keessen, Aldert Jan"]
[Black "Mellegers, Joost P"]
[Result "1/2-1/2"]
[ECO "D30"]
[WhiteElo "2166"]
[BlackElo "2260"]
[PlyCount "128"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c6 4. e3 Nf6 5. Nbd2 Nbd7 6. b3 Bd6 7. Bb2 0-0 8. Bd3 Qe7 9. Ne5 Ba3 10. Bxa3 Qxa3 11. Nxd7 Bxd7 12. c5 b6 13. Qc1 Qa5 14. f4 bxc5 15. Qxc5 Qxc5 16. dxc5 e5 17. fxe5 Ng4 18. Nf3 Rfe8 19. Kd2 Nxe5 20. Nxe5 Rxe5 21. Rhf1 Rh5 22. h3 Rg5 23. Rf2 Re8 24. Re1 f6 25. Ree2 Kf7 26. Rf4 Re7 27. b4 Bc8 28. a4 Rc7 29. Kc3 a5 30. bxa5 Ra7 31. a6 Bxa6 32. Bxa6 Rxa6 33. Kb4 Re5 34. Kc3 Ra5 35. Kb4 Ra6 36. Kc3 Re7 37. Rd4 Ra5 38. Kb4 Ra8 39. Kc3 f5 40. h4 Rae8 41. Kd3 Rb8 42. Ra2 Rb3+ 43. Kc2 Rexe3 44. a5 Rec3+ 45. Kd2 Rxc5 46. a6 Rb8 47. a7 Ra8 48. Rb4 Rb5 49. Rxb5 cxb5 50. Ra6 b4 51. Kd3 g6 52. Kd4 Kg7 53. h5 Kh6 54. hxg6 hxg6 55. Kxd5 b3 56. Ke6 b2 57. Rb6 Kg5 58. Rxb2 Rxa7 59. Rb3 Ra4 60. Kf7 Ra2 61. Rg3+ Kf4 62. Rxg6 Ra3 63. Kf6 Ra6+ 64. Kf7 Rxg6 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.30"]
[Round "6"]
[White "Van Ketel, Raoul"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "A68"]
[WhiteElo "2247"]
[BlackElo "2166"]
[PlyCount "134"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d6 2. c4 Nf6 3. Nc3 g6 4. e4 Bg7 5. f4 0-0 6. Nf3 c5 7. d5 e6 8. Be2 exd5 9. cxd5 Bg4 10. 0-0 Nbd7 11. Re1 Bxf3 12. Bxf3 Ne8 13. Be3 Nc7 14. a4 a6 15. Bf2 Re8 16. Qc2 Rb8 17. e5 dxe5 18. f5 e4 19. Bxe4 Nf6 20. Rad1 Nxe4 21. Nxe4 Bd4 22. Bxd4 cxd4 23. Qf2 Nxd5 24. Rxd4 Re5 25. Red1 Qf8 26. Rxd5 Rxe4 27. f6 Rbe8 28. h3 Qb4 29. Rd8 h6 30. Rxe8+ Rxe8 31. Rd4 Qb6 32. Kh2 Re6 33. Rf4 g5 34. Rf3 Qxf2 35. Rxf2 Kh7 36. Rc2 Kg6 37. a5 Kxf6 38. Rc7 Re7 39. Rc8 Re4 40. Rc2 Ra4 41. Rc7 Rb4 42. Kg3 Rb3+ 43. Kh2 h5 44. Rc5 h4 45. Kg1 Rxb2 46. Kf1 Rb5 47. Rc7 Rxa5 48. Rxb7 Rf5+ 49. Ke2 a5 50. Ra7 Kg6 51. Ra6+ f6 52. Ra7 Re5+ 53. Kf3 Kf5 54. Ra6 Rb5 55. Kf2 Rb2+ 56. Kg1 Ra2 57. Kh2 Ke5 58. Ra8 f5 59. Re8+ Kf4 60. Rc8 Re2 61. Rc4+ Re4 62. Rc3 a4 63. Kg1 g4 64. hxg4 fxg4 65. g3+ hxg3 66. Kg2 Rb4 67. Rc8 Rb2+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.23"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Oosterom, Erik"]
[Result "1-0"]
[ECO "D45"]
[WhiteElo "2166"]
[BlackElo "2028"]
[PlyCount "95"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 a6 5. Qc2 e6 6. Nf3 c5 7. cxd5 exd5 8. Be2 Nc6 9. 0-0 Be6 10. Rd1 cxd4 11. exd4 h6 12. Ne5 Bd6 13. Nxc6 bxc6 14. Na4 Qc7 15. h3 0-0 16. Nc5 Bc8 17. Be3 Nd7 18. Nd3 Nb6 19. Ne5 Bb7 20. Rac1 Rac8 21. Bg4 Rce8 22. Nxc6 f5 23. Na5 Qf7 24. Bxf5 Qxf5 25. Qxf5 Rxf5 26. Nxb7 Bf8 27. b3 Rf6 28. Rc7 Ra8 29. Na5 Bb4 30. Bd2 Bd6 31. Rc6 Nd7 32. Re1 Ba3 33. Rc7 Nf8 34. Rc6 Rxc6 35. Nxc6 Rc8 36. Nb4 Bxb4 37. Bxb4 Ng6 38. g3 Kf7 39. Bc5 h5 40. Re3 Rc6 41. b4 h4 42. a4 hxg3 43. fxg3 Re6 44. Kf2 Rxe3 45. Kxe3 Ke6 46. b5 axb5 47. axb5 Nh8 48. b6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "4"]
[White "Heemskerk, Wim"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "E68"]
[WhiteElo "2176"]
[BlackElo "2166"]
[PlyCount "94"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. Nf3 d6 2. g3 g6 3. d4 Nf6 4. Bg2 Bg7 5. 0-0 0-0 6. c4 Nbd7 7. Qc2 e5 8. Rd1 Qe7 9. Nc3 c6 10. e4 a5 11. Rb1 exd4 12. Nxd4 Re8 13. b3 Nc5 14. f3 Bd7 15. a3 Rad8 16. b4 axb4 17. axb4 Ne6 18. Nde2 Bc8 19. Be3 Nd7 20. f4 h5 21. Qd2 Nf6 22. Bb6 Rd7 23. Re1 Ng4 24. h3 Nh6 25. Nd4 Nxd4 26. Bxd4 Bxd4+ 27. Qxd4 h4 28. g4 f6 29. b5 Nf7 30. bxc6 bxc6 31. Qf2 Rc7 32. Qxh4 Ba6 33. Qf2 Bxc4 34. Qd4 Ba6 35. Qb6 Bb7 36. Rbc1 Rd7 37. e5 fxe5 38. Ne4 c5 39. fxe5 Bxe4 40. Bxe4 Qxe5 41. Kg2 Qg5 42. Qa5 Rde7 43. Bf3 Ne5 44. Bd5+ Kg7 45. Qa2 Nd3 46. Rxe7+ Rxe7 47. Qa1+ Kh7 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.02"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Oosthout, Wouter"]
[Result "1-0"]
[ECO "D10"]
[WhiteElo "2166"]
[BlackElo "1848"]
[PlyCount "117"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 a6 5. Qc2 g6 6. Bd3 Bg7 7. Nf3 e6 8. 0-0 0-0 9. b3 Re8 10. Bb2 Nbd7 11. Rfd1 b5 12. Ne2 Bb7 13. h3 Rc8 14. c5 Nf8 15. Ng3 Rc7 16. Bf1 Rce7 17. Nd2 N6d7 18. e4 f6 19. Bd3 Nb8 20. a4 f5 21. e5 Rc7 22. Bc3 Rf7 23. f4 Bh6 24. Ne2 g5 25. fxg5 Bxg5 26. Nf3 Be3+ 27. Kh1 Rg7 28. Bd2 Bxd2 29. Qxd2 Ree7 30. Nf4 Qe8 31. Ng1 Kh8 32. Be2 Bc8 33. Bf3 Nbd7 34. Nge2 Rg8 35. Rg1 Ng6 36. g3 Qf8 37. Kh2 Qe8 38. Rg2 Rf7 39. Nd3 Rfg7 40. Nef4 Qf7 41. Qf2 Qe7 42. axb5 Nxf4 43. Nxf4 axb5 44. Ra7 Qe8 45. Bh5 Qe7 46. Rc7 Rg5 47. Be2 Qe8 48. h4 R5g7 49. Bh5 Rg6 50. Bxg6 hxg6 51. Nh3 Rg7 52. Qe3 g5 53. Nxg5 Nf6 54. exf6 Rxc7 55. Qe5 Rf7 56. Ra2 Kg8 57. Nxf7 Kxf7 58. Ra7+ Bd7 59. Qd6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.05.26"]
[Round "2"]
[White "Keessen, Aldert Jan"]
[Black "Gruijters, Dirk"]
[Result "1-0"]
[ECO "D46"]
[WhiteElo "2166"]
[BlackElo "1918"]
[PlyCount "81"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 Bd6 7. Bd3 dxc4 8. Bxc4 b5 9. Be2 Bb7 10. 0-0 0-0 11. Rd1 a6 12. e4 Be7 13. e5 Nd5 14. Ne4 Rc8 15. a4 c5 16. axb5 cxd4 17. Qb1 axb5 18. Bxb5 Qc7 19. Bxd7 Qxd7 20. Bg5 f6 21. exf6 Nxf6 22. Rxd4 Bd5 23. Nc3 Qb7 24. Nxd5 Nxd5 25. Bxe7 Qxe7 26. Qe1 Rfe8 27. Rad1 Rb8 28. Re4 Nf6 29. Re2 Rb6 30. Red2 Nd5 31. Qe5 h6 32. h3 Kf8 33. Nd4 Qf6 34. Qe4 Kg8 35. Re1 Qf7 36. Nf3 Nf6 37. Qd4 Reb8 38. Ne5 Qe7 39. Re3 Qb4 40. Qd3 Qa5 41. Nc4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.05.19"]
[Round "1"]
[White "Van Splunter, Arjen"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "1933"]
[BlackElo "2166"]
[PlyCount "111"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bc4 Bg7 5. Nge2 0-0 6. f3 c6 7. a3 e5 8. dxe5 dxe5 9. Be3 Qe7 10. Nc1 b6 11. b4 Ne8 12. 0-0 Nd6 13. Bb3 Ba6 14. Nd3 Nc4 15. Qe2 Nxe3 16. Qxe3 Nd7 17. Rfd1 Nf6 18. Rd2 h5 19. Qg5 Kh7 20. Qxe5 Qxe5 21. Nxe5 Ng4 22. Nd7 Bxc3 23. Nxf8+ Rxf8 24. Rad1 Ne3 25. Rd8 Nxd1 26. Rxf8 Bd4+ 27. Kh1 Nf2+ 28. Kg1 Nxe4+ 29. Kh1 Nf2+ 30. Kg1 Nd1+ 31. Kh1 f5 32. Rf7+ Kh6 33. Rxa7 Be2 34. Rd7 c5 35. Rd6 h4 36. Bf7 Kg7 37. Rd7 Kf6 38. Bd5 g5 39. c4 g4 40. fxg4 fxg4 41. Rd6+ Kg5 42. Re6 Nf2+ 43. Kg1 Nh3+ 44. Kh1 Nf4 45. Rxb6 h3 46. Rb8 Bxc4 47. Bc6 Bf1 48. Rg8+ Kf5 49. gxh3 gxh3 50. bxc5 Bxc5 51. a4 Be2 52. Rg3 Bf2 53. Bd7+ Ke5 54. Rxh3 Nxh3 55. Bxh3 Kf4 56. Bg2 1/2-1/2

[Event "Oberliga NRW 9900 I"]
[Site "Germany"]
[Date "2000.03.01"]
[Round "6.8"]
[White "Keessen, Aldert Jan"]
[Black "Loyen, Egbert"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2110"]
[BlackElo "1998"]
[PlyCount "81"]
[EventDate "1999.10.26"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]
[WhiteTeam "Lohmar"]
[BlackTeam "Essen Borbeck"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 f6 9. exf6 Nxf6 10. 0-0 Bd6 11. Nf3 0-0 12. Bf4 Bxf4 13. Nxf4 Qc7 14. g3 Bd7 15. Re1 Qb6 16. b3 Rae8 17. Rc1 a5 18. Bb1 Re7 19. Rc3 Nd8 20. Rce3 Qd6 21. Ne5 Bc6 22. Nh5 Be8 23. Nxf6+ gxf6 24. Nd3 Rg7 25. Qc2 b6 26. Qe2 Bb5 27. Qh5 Be8 28. Qh4 Bg6 29. Qf4 Qd7 30. Qb8 Bxd3 31. Bxd3 Qc6 32. Qf4 e5 33. dxe5 Ne6 34. Qa4 Qxa4 35. bxa4 fxe5 36. Rxe5 Nf4 37. Bf1 d4 38. Re7 Ng6 39. Bc4+ Kh8 40. R7e4 Rd8 41. Re8+ 1-0

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.14"]
[Round "9"]
[White "Keessen, Aldert Jan"]
[Black "Azarov, Sergei Nikolaevich"]
[Result "1/2-1/2"]
[ECO "C45"]
[BlackElo "2432"]
[PlyCount "109"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[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. Bb3 Ng6 10. Na3 d6 11. Nc4 Bd7 12. f4 Qe7 13. Qd3 Rae8 14. Bc2 Nxd4 15. Bxd4 Bb5 16. Bxb6 axb6 17. a4 Bc6 18. Rae1 Qh4 19. Qg3 Qxg3 20. hxg3 Re7 21. Re3 Ra8 22. Nd2 b5 23. axb5 Bxb5 24. Rb1 Ree8 25. Kf2 Nf8 26. Nf3 c5 27. Bb3 Nd7 28. Ng5 c4 29. Bd1 Nc5 30. Bc2 Ba4 31. Bxa4 Rxa4 32. Kf3 Ra2 33. Nh3 b5 34. Nf2 f6 35. Re2 Na4 36. Nd1 Kf7 37. g4 Re7 38. b3 cxb3 39. Rxb3 Rxe2 40. Kxe2 Rxe4+ 41. Kf3 Rc4 42. Rxb5 Nxc3 43. Rb7+ Kf8 44. Ne3 Rc6 45. Nf5 g6 46. Nd4 Rc4 47. Ne6+ Ke8 48. Rxh7 Nb5 49. f5 gxf5 50. gxf5 Nd4+ 51. Nxd4 Rxd4 52. Ra7 Rb4 53. Ra8+ Ke7 54. Ra7+ Ke8 55. Ra8+ 1/2-1/2

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.13"]
[Round "7"]
[White "Keessen, Aldert Jan"]
[Black "Solleveld, Maarten"]
[Result "1/2-1/2"]
[ECO "C45"]
[BlackElo "2404"]
[PlyCount "59"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Bc4 0-0 8. 0-0 Bb6 9. Bb3 Na5 10. Bc2 Nc4 11. Bc1 d5 12. exd5 Bxd4 13. cxd4 Bf5 14. Bb3 Nb6 15. Nc3 Rad8 16. Bf4 Nbxd5 17. Be5 Qg6 18. Qf3 c6 19. Rfe1 Bg4 20. Qe4 Nxc3 21. bxc3 Qxe4 22. Rxe4 Bf5 23. Rf4 Bg6 24. c4 f6 25. Bc7 Rc8 26. Bd6 Rfe8 27. d5 Nf5 28. c5 Kh8 29. dxc6 bxc6 30. Ra4 1/2-1/2

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.13"]
[Round "8"]
[White "Lammens, Tim"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B76"]
[PlyCount "92"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[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. 0-0-0 d5 10. exd5 Nxd5 11. Nxc6 bxc6 12. Bd4 e5 13. Bc5 Be6 14. Ne4 Re8 15. h4 h6 16. g4 Qc7 17. Bc4 Red8 18. Qe1 Nf4 19. Bxe6 Nxe6 20. Be3 f5 21. gxf5 gxf5 22. Rxd8+ Rxd8 23. Nc3 Kh7 24. Rg1 Qf7 25. Qf1 Nd4 26. Qg2 Rg8 27. f4 exf4 28. Bxf4 Ne6 29. Qf3 Nxf4 30. Qxf4 Be5 31. Qf2 Rxg1+ 32. Qxg1 Bxc3 33. bxc3 Qxa2 34. Qc5 Qd5 35. Qxa7+ Kg6 36. Qf2 Qe4 37. Qg3+ Kh5 38. Qd6 f4 39. Qf6 f3 40. Kb2 c5 41. Kb3 Qe3 42. Kb2 Kg4 43. Qg6+ Kh3 44. Qf5+ Kh2 45. h5 f2 46. Kb3 Kg2 0-1

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.12"]
[Round "6"]
[White "Muhren, Bianca"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "A04"]
[PlyCount "122"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d3 g6 4. g3 Bg7 5. Bg2 Nc6 6. 0-0 e5 7. Nbd2 Nge7 8. c3 0-0 9. Nc4 h6 10. Nfd2 Be6 11. f4 exf4 12. gxf4 f5 13. Ne3 fxe4 14. dxe4 d5 15. Nb3 Qb6 16. exd5 Rad8 17. Nc4 Qb5 18. Na3 Qb6 19. Nc4 Qb5 20. Na3 Qb6 21. Be3 Bxd5 22. Bxc5 Qc7 23. Nb5 Qb8 24. Qg4 Bc4 25. Bxc6 Nxc6 26. Bxf8 Rxf8 27. Na3 Bxf1 28. Rxf1 Kh7 29. f5 Rf6 30. Qe4 gxf5 31. Rxf5 Rg6+ 32. Kh1 Qd8 33. Rd5 Qb6 34. Rd1 Ne5 35. Nc4 Nxc4 36. Qxc4 Qe3 37. Qd3 Qe6 38. Nd4 Qxa2 39. Ne6 Qxe6 40. Qd5 Qxd5+ 41. Rxd5 Rb6 42. Rd2 Kg6 43. Kg2 Kf5 44. Kf3 Be5 45. h3 Rd6 46. Rf2 Bf4 47. h4 Rd3+ 48. Kg2 Rd2 49. Rxd2 Bxd2 50. Kf3 Bc1 51. b3 Bb2 52. c4 a5 53. h5 Bd4 54. Ke2 Ke4 55. Kd2 b6 56. Kc2 Ke3 57. Kb1 Kd2 58. Ka2 Kc2 59. Ka3 Bc5+ 60. Ka4 Kc3 61. b4 axb4 0-1

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.11"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Middelburg, Tom"]
[Result "0-1"]
[ECO "B22"]
[BlackElo "2326"]
[PlyCount "68"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 e6 5. d4 cxd4 6. cxd4 b6 7. Nc3 Nxc3 8. bxc3 Qc7 9. Bd2 Bb7 10. Bd3 d6 11. 0-0 Nd7 12. Re1 dxe5 13. Nxe5 Nxe5 14. Rxe5 Bd6 15. Rh5 g6 16. Rh3 h5 17. Bg5 Be7 18. Bb5+ Kf8 19. Qd2 Kg7 20. Re1 Bxg5 21. Qxg5 Qd8 22. Qe5+ Qf6 23. Qc7 Bxg2 24. Kxg2 Qg5+ 25. Rg3 Qxb5 26. Re5 Qe8 27. d5 Qd8 28. Qc4 h4 29. Rf3 h3+ 30. Rxh3 Rxh3 31. Kxh3 Qf6 32. Qe2 exd5 33. Rxd5 Re8 34. Qd3 Qxf2 0-1

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.11"]
[Round "4"]
[White "Van Beek, Alexander"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B76"]
[WhiteElo "2294"]
[PlyCount "76"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[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. 0-0-0 d5 10. Qe1 e5 11. Nxc6 bxc6 12. exd5 Nxd5 13. Bc4 Be6 14. Ne4 Qc7 15. Bc5 Rfd8 16. g4 h6 17. h4 Nf4 18. Bxe6 Nxe6 19. Bd6 Qb6 20. g5 Nd4 21. Rd3 h5 22. Qd2 Nf5 23. Bc5 Rxd3 24. Qxd3 Qa5 25. Qc4 Rd8 26. Rd1 Rxd1+ 27. Kxd1 Qd8+ 28. Ke2 Nxh4 29. Bxa7 Qd7 30. Bf2 Ng2 31. Bg3 h4 32. Kf2 Qh3 33. Qxc6 hxg3+ 34. Nxg3 Nf4 35. Qe8+ Kh7 36. Qxf7 Qg2+ 37. Ke3 Qxg3 38. Kd2 e4 0-1

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.10"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Johannessen, Leif Erlend"]
[Result "0-1"]
[ECO "C02"]
[BlackElo "2356"]
[PlyCount "68"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Qb6 5. Nf3 Nc6 6. a3 f6 7. exf6 Nxf6 8. Be2 Bd6 9. b4 cxd4 10. cxd4 0-0 11. Be3 Bd7 12. 0-0 a5 13. b5 Na7 14. a4 Qd8 15. Nbd2 Qe7 16. Ne5 Nc8 17. Nb3 b6 18. Rc1 Ba3 19. Rc7 Qd8 20. Qc2 Bd6 21. Rb7 Ra7 22. Rxa7 Nxa7 23. Rc1 Qe7 24. Qd3 Bb8 25. g3 Ne4 26. Nc6 Nxc6 27. bxc6 Be8 28. Qc2 Bc7 29. Nd2 Nd6 30. Nf3 Nf5 31. Bg5 Qf7 32. Ne5 Bxe5 33. dxe5 Nd4 34. c7 Bd7 0-1

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.10"]
[Round "2"]
[White "Pluister, D."]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B50"]
[PlyCount "50"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Nc3 Nf6 4. Bc4 Nc6 5. 0-0 Bg4 6. h3 Bh5 7. Qe1 Bxf3 8. gxf3 Nd4 9. Qd1 Qd7 10. Bb5 Nxb5 11. Nxb5 Qxb5 12. d3 g6 13. f4 Qd7 14. Qf3 Bg7 15. Re1 0-0 16. e5 Ne8 17. b3 d5 18. Bb2 Nc7 19. Qe3 d4 20. Qf3 Qd5 21. Qg3 e6 22. c4 dxc3 23. Bxc3 Nb5 24. Bd2 Nd4 25. Re4 Qxe4 0-1

[Event "NED U20 op"]
[Site "Hengelo"]
[Date "1999.08.09"]
[Round "1"]
[White "Keessen, Aldert Jan"]
[Black "Van der Stap, Harry Sr"]
[Result "1-0"]
[ECO "B22"]
[PlyCount "55"]
[EventDate "1999.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 071 Extra"]
[Source "ChessBase"]
[SourceDate "1999.09.14"]
[SourceVersion "1"]
[SourceVersionDate "1999.09.14"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nc6 3. d4 cxd4 4. cxd4 d6 5. h3 g6 6. Nf3 Bg7 7. Nc3 Bd7 8. Be3 a6 9. Rc1 Rc8 10. Bd3 Nf6 11. 0-0 0-0 12. Qe2 e6 13. Rfd1 d5 14. Bg5 h6 15. Bh4 g5 16. Bg3 Nh5 17. Bh2 Re8 18. Bb1 Nf6 19. Ne5 Qb6 20. Qd3 Nb4 21. Qf3 Re7 22. Nxd7 Nxd7 23. Nxd5 exd5 24. Rxc8+ Nf8 25. e5 Qe6 26. Bf5 Qb6 27. Qb3 Qa5 28. Rc5 1-0

[Event "Haarlem AKN op 08th"]
[Site "Haarlem"]
[Date "1999.07.04"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Cliteur, Olaf"]
[Result "1-0"]
[ECO "B22"]
[PlyCount "64"]
[EventDate "1999.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 Nc6 5. Bc4 Nb6 6. Bb3 c4 7. Bc2 d6 8. exd6 Qxd6 9. 0-0 Bg4 10. h3 Bh5 11. Qe2 Qf6 12. b3 Bxf3 13. Qxf3 Qxf3 14. gxf3 e6 15. Na3 cxb3 16. axb3 0-0-0 17. d4 Nd5 18. Bd2 e5 19. dxe5 Nxe5 20. Kg2 Ng6 21. Rfd1 a6 22. Be4 Ndf4+ 23. Kf1 Bd6 24. Nc4 Bc7 25. Be3 Kb8 26. Rd4 Ne6 27. Rxd8+ Rxd8 28. Na5 Bxa5 29. Rxa5 Ngf4 30. Kg1 Ng6 31. Bg5 Rd6 32. c4 Kc8 1-0

[Event "Haarlem AKN op 08th"]
[Site "Haarlem"]
[Date "1999.07.04"]
[Round "6"]
[White "Strating, Sybolt"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "E76"]
[WhiteElo "2334"]
[PlyCount "65"]
[EventDate "1999.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[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 Bg7 4. e4 d6 5. f4 0-0 6. Nf3 Na6 7. Bd3 Bg4 8. Be3 e5 9. fxe5 dxe5 10. d5 Nh5 11. 0-0 Nf4 12. c5 Nb4 13. Bc4 c6 14. a3 cxd5 15. exd5 e4 16. Bxf4 exf3 17. gxf3 Bh3 18. axb4 Qh4 19. Qd2 g5 20. Rfe1 gxf4 21. Re4 Bh6 22. Kh1 Kh8 23. Rg1 Rg8 24. Ne2 f6 25. Qd4 Bf5 26. Re7 Rxg1+ 27. Nxg1 b5 28. Bb3 Bf8 29. Re2 Bh3 30. d6 Bf1 31. Qd5 Qg5 32. Qxa8 Qg7 33. Qd5 1-0

[Event "Haarlem AKN op 08th"]
[Site "Haarlem"]
[Date "1999.07.03"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Van Eijk, Jasper"]
[Result "1-0"]
[ECO "B22"]
[PlyCount "55"]
[EventDate "1999.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 e6 5. d4 cxd4 6. cxd4 b6 7. Nc3 Nxc3 8. bxc3 Qc7 9. Bd2 Bb7 10. Bd3 d6 11. 0-0 Nd7 12. Re1 dxe5 13. Nxe5 Bd6 14. f4 0-0 15. Re3 Nf6 16. Qe2 Rfd8 17. Rh3 g6 18. Re1 Bf8 19. Qf2 Qd6 20. Qh4 Bg7 21. Ng4 Qd5 22. Re2 Nh5 23. Ne5 Nf6 24. f5 gxf5 25. Bg5 Ne8 26. Bc4 Qd6 27. Be7 Qc7 28. Qxh7# 1-0

[Event "Haarlem AKN op 08th"]
[Site "Haarlem"]
[Date "1999.07.03"]
[Round "4"]
[White "Mitkov, Nikola"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B72"]
[WhiteElo "2509"]
[PlyCount "53"]
[EventDate "1999.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. Nf3 g6 4. d4 cxd4 5. Nxd4 Bg7 6. Be3 Nf6 7. Bc4 d6 8. h3 0-0 9. Bb3 Nxd4 10. Bxd4 b5 11. 0-0 a6 12. Re1 Bb7 13. Nd5 Bxd5 14. exd5 Nd7 15. Bxg7 Kxg7 16. Qd4+ Kg8 17. Re3 Rc8 18. c3 Re8 19. Rae1 Rc5 20. Qh4 Ne5 21. Re4 Nd3 22. R1e3 Nc1 23. Qh6 Nxb3 24. Rh4 e5 25. Qxh7+ Kf8 26. Rf3 Rc7 27. Qh8+ 1-0

[Event "Haarlem AKN op 08th"]
[Site "Haarlem"]
[Date "1999.07.02"]
[Round "1"]
[White "Meester, Andre"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "A65"]
[PlyCount "67"]
[EventDate "1999.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[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 Bg7 4. e4 d6 5. f3 0-0 6. Be3 c5 7. Nge2 Nc6 8. d5 Ne5 9. Nc1 e6 10. Be2 exd5 11. cxd5 h5 12. Qd2 Re8 13. 0-0 a6 14. b4 cxb4 15. Na4 Ned7 16. Rb1 b5 17. Nb2 Rb8 18. Nb3 Bb7 19. Nd3 Rc8 20. Nxb4 Nxe4 21. fxe4 Bc3 22. Qd1 Bxb4 23. Bxh5 Rxe4 24. Qd3 Qe8 25. Bd4 Nc5 26. Qh3 Qd7 27. Bg4 f5 28. Qh8+ Kf7 29. Rxf5+ Qxf5 30. Qg7+ Ke8 31. Bxf5 gxf5 32. Qg6+ Kd8 33. Qxd6+ Ke8 34. Bxc5 1-0

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.11"]
[Round "9"]
[White "Keessen, Aldert Jan"]
[Black "Lammens, Tim"]
[Result "1-0"]
[ECO "A42"]
[PlyCount "70"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. d4 g6 2. c4 Bg7 3. e4 d6 4. Nc3 Nc6 5. d5 Nd4 6. Be3 c5 7. Nge2 Qb6 8. Qd2 Nf6 9. f3 0-0 10. Rd1 Nxe2 11. Bxe2 e6 12. 0-0 exd5 13. cxd5 Bd7 14. Rb1 Qa5 15. a4 Rfe8 16. Bg5 Qb4 17. Qf4 Nh5 18. Qxd6 Bxa4 19. Nxa4 Qxa4 20. b3 Qd4+ 21. Kh1 Be5 22. Qd7 Bf4 23. Bxf4 Nxf4 24. Bc4 Qd2 25. Rg1 b6 26. d6 Rf8 27. Qe7 b5 28. Bxb5 Rad8 29. Rbd1 Qf2 30. Qf6 Nh5 31. Qg5 f6 32. Qd2 Qh4 33. g3 Qh3 34. d7 Ng7 35. Bf1 Qh5 1-0

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.10"]
[Round "8"]
[White "Vink, Nico"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B74"]
[WhiteElo "2252"]
[PlyCount "55"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. 0-0 0-0 8. Be3 Nc6 9. Nb3 Be6 10. f4 Rc8 11. Kh1 a6 12. Bd3 Na5 13. Nd4 Bd7 14. Qe2 Qc7 15. Rae1 Nc4 16. Bc1 e5 17. fxe5 Nxe5 18. Bg5 Qb6 19. Nb3 Bg4 20. Qd2 Ned7 21. Bxf6 Nxf6 22. Rxf6 Rxc3 23. Qxc3 Rc8 24. Qd2 Bxf6 25. Qf4 Bxb2 26. Qxg4 Rc7 27. Rf1 Qb4 28. Qg5 1-0

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.09"]
[Round "7"]
[White "Keessen, Aldert Jan"]
[Black "Jens, Jelmer"]
[Result "1-0"]
[ECO "E99"]
[PlyCount "91"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[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. Bd2 Nf6 12. f3 f4 13. c5 g5 14. Rc1 Ng6 15. cxd6 cxd6 16. Nb5 Rf7 17. Qc2 Ne8 18. a4 Bf8 19. Nf2 h5 20. h3 Nh4 21. Qb3 Bd7 22. Rc2 a6 23. Na3 b6 24. Nc4 Rb8 25. Qa3 Rg7 26. Be1 Nf6 27. b4 g4 28. fxg4 hxg4 29. Bxg4 Bxg4 30. Nxg4 Nxg4 31. hxg4 Rxg4 32. Qh3 Qg5 33. Bxh4 Rxh4 34. Qe6+ Kh8 35. Nxd6 Bxd6 36. Qxd6 Rg8 37. Rf3 Qh5 38. Qf6+ Rg7 39. Rc7 Rh1+ 40. Kf2 Qh4+ 41. Qxh4+ Rxh4 42. d6 Rhh7 43. Rfc3 Rf7 44. Rxf7 Rxf7 45. Rc7 Kg8 46. d7 1-0

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.08"]
[Round "6"]
[White "Ernst, Sipke"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "E61"]
[WhiteElo "2428"]
[PlyCount "69"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. Nf3 g6 2. c4 Bg7 3. Nc3 d6 4. d4 Bg4 5. e3 Nc6 6. Be2 Nf6 7. 0-0 0-0 8. Re1 e5 9. d5 Ne7 10. e4 a5 11. Rb1 Ne8 12. a3 f5 13. Ng5 Bxe2 14. Rxe2 Qd7 15. b4 axb4 16. axb4 f4 17. f3 Bf6 18. Ne6 Rf7 19. Qb3 Nc6 20. dxc6 Qxe6 21. cxb7 Rb8 22. c5 Qxb3 23. Rxb3 Rxb7 24. c6 Ra7 25. Ra3 Rxa3 26. Bxa3 Ng7 27. Ra2 Ne6 28. Bb2 Bh4 29. Kf1 Nd4 30. Ra6 Nc2 31. Nd5 Rf8 32. b5 Rc8 33. Ra7 Rb8 34. Nxc7 Ne3+ 35. Ke2 1-0

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.07"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Amesz, Jaap"]
[Result "1/2-1/2"]
[ECO "A54"]
[BlackElo "2236"]
[PlyCount "50"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 Nc6 3. Nf3 d6 4. Nc3 e5 5. Bg5 Be7 6. e3 0-0 7. h3 Nd7 8. Bxe7 Nxe7 9. Qc2 exd4 10. Nxd4 Re8 11. Bd3 Nf8 12. 0-0 Nc6 13. Be4 Nxd4 14. exd4 Re6 15. f4 c6 16. d5 Rh6 17. dxc6 bxc6 18. Kh2 Qc7 19. Rad1 Bb7 20. Qd2 Nd7 21. Rfe1 Re6 22. Bf5 Rxe1 23. Rxe1 Nf6 24. Qe3 Kf8 25. Qd4 a6 1/2-1/2

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.06"]
[Round "4"]
[White "Wempe, Joost"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B22"]
[PlyCount "136"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 cxd4 5. Nf3 e6 6. cxd4 b6 7. Nc3 Nxc3 8. bxc3 Qc7 9. Bd2 d6 10. Bd3 Bb7 11. 0-0 Nd7 12. Ng5 dxe5 13. Qh5 g6 14. Qh3 Be7 15. Rae1 h6 16. f4 Bxg5 17. fxg5 h5 18. Qg3 Rf8 19. Bc1 Qxc3 20. dxe5 0-0-0 21. Re3 Qa5 22. Be2 Kb8 23. Kh1 Nc5 24. Bf3 Ba6 25. Be2 Bxe2 26. Rxe2 Qb5 27. Qf3 Nd3 28. Ba3 Nc5 29. Rb2 Qc4 30. Rbb1 Qd5 31. Rfc1 Ka8 32. Bxc5 bxc5 33. Rxc5 Qxf3 34. gxf3 Rc8 35. Rcb5 Rb8 36. Rxb8+ Rxb8 37. Rd1 a5 38. Kg1 Rb2 39. Rd7 Rb7 40. Rd4 Ka7 41. Kf2 Kb6 42. Ke3 Kc5 43. Ra4 Rb5 44. Rf4 Rb7 45. Ra4 Kb5 46. Rd4 Rc7 47. a4+ Kc5 48. Kd3 Rb7 49. Rc4+ Kd5 50. Re4 Rb3+ 51. Ke2 Rc3 52. Rf4 Rc7 53. h4 Kxe5 54. Re4+ Kd5 55. Kd3 e5 56. f4 Rc3+ 57. Kxc3 Kxe4 58. fxe5 Kf4 59. Kd4 Kg4 60. e6 fxe6 61. Ke5 Kxh4 62. Kf6 e5 63. Kxg6 e4 64. Kf5 e3 65. g6 e2 66. g7 e1Q 67. g8Q Qf2+ 68. Ke4 Qe2+ 0-1

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.05"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Van Ruitenburg, Joost"]
[Result "1-0"]
[ECO "D31"]
[PlyCount "51"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. cxd5 exd5 4. Nc3 c6 5. Bf4 Bd6 6. Bxd6 Qxd6 7. e3 f5 8. Bd3 Nf6 9. Nge2 0-0 10. Qc2 b6 11. 0-0 g6 12. f3 Ba6 13. e4 fxe4 14. fxe4 dxe4 15. Nxe4 Nxe4 16. Rxf8+ Kxf8 17. Bxe4 Bxe2 18. Qxe2 Qxd4+ 19. Kh1 Kg7 20. Bf3 Qf6 21. Qe8 a5 22. Re1 b5 23. Re7+ Kh6 24. Rf7 Qd4 25. Qf8+ Kg5 26. Qe7+ 1-0

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.04"]
[Round "2"]
[White "Berkvens, Joost"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B76"]
[WhiteElo "2215"]
[PlyCount "65"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Bc4 0-0 9. Qe2 Na5 10. Bd3 e5 11. Nb3 Be6 12. 0-0 Rc8 13. Nxa5 Qxa5 14. Nb5 d5 15. Nxa7 Ra8 16. Nb5 dxe4 17. fxe4 Rfc8 18. b3 Ng4 19. Bd2 Qb6+ 20. Kh1 f5 21. exf5 e4 22. Bxe4 gxf5 23. Bxb7 Bxa1 24. Bxa8 Rxa8 25. h3 Rxa2 26. hxg4 Bd7 27. Qc4+ Be6 28. Qd3 f4 29. Qe4 Bxb3 30. Qe8+ Kg7 31. Bxf4 Bc4 32. Qe7+ Kg8 33. Bd6 1-0

[Event "NED-ch U20 "]
[Site "Leiden"]
[Date "1999.05.03"]
[Round "1"]
[White "Keessen, Aldert Jan"]
[Black "Middelburg, Tom"]
[Result "1/2-1/2"]
[ECO "E01"]
[BlackElo "2266"]
[PlyCount "86"]
[EventDate "1999.05.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 070 Extra"]
[Source "ChessBase"]
[SourceDate "1999.07.10"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.10"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 e6 4. Nc3 dxc4 5. g3 Nf6 6. Bg2 b5 7. e4 Bb7 8. 0-0 Nbd7 9. e5 Nd5 10. Ng5 h6 11. Qh5 g6 12. Qh3 Be7 13. Bxd5 cxd5 14. Nxb5 Qb6 15. Nd6+ Bxd6 16. exd6 Qxd4 17. Nxe6 fxe6 18. Qxe6+ Kd8 19. Qe7+ Kc8 20. Bxh6 Qe4 21. Rae1 Qxe7 22. dxe7 Re8 23. Re6 Nc5 24. Rxg6 Rxe7 25. Bf8 Re6 26. Rg4 Nd3 27. Bg7 Kd7 28. Bc3 Rae8 29. h4 Re4 30. Rg7+ R8e7 31. h5 Rxg7 32. Bxg7 Ke8 33. f3 Re2 34. Bd4 Kf7 35. g4 Bc8 36. b3 Nf4 37. bxc4 dxc4 38. Rc1 Be6 39. Rb1 Bd5 40. Rb5 a6 41. Ra5 Re6 42. Kf1 Rc6 43. Be3 Bxf3 1/2-1/2

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Agter, Frank"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B06"]
[PlyCount "84"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 g6 2. d4 c6 3. h4 h5 4. Bd3 d5 5. e5 Na6 6. c3 Qb6 7. Ne2 Nc7 8. Nf4 Rh6 9. Qc2 Be6 10. Nxe6 Nxe6 11. Bxh6 Bxh6 12. Nd2 0-0-0 13. b4 Ng7 14. a4 e6 15. Nb3 Nf5 16. Nc5 Bf8 17. a5 Qc7 18. Qe2 Ngh6 19. Kd2 Ng4 20. Rhb1 Nxh4 21. f3 Bh6+ 22. Ke1 Ne3 23. g3 Nhg2+ 24. Kf2 h4 25. gxh4 Qe7 26. Rh1 Bf4 27. b5 Nxh4 28. bxc6 Qg5 29. cxb7+ Kc7 30. Na6+ Kd7 31. Rag1 Neg2 32. Rxh4 Be3+ 33. Kf1 Bxg1 34. Rg4 Ne3+ 35. Kxg1 Nxg4 36. fxg4 Qc1+ 37. Kg2 Rh8 38. b8Q Qh1+ 39. Kf2 Rh2+ 40. Ke3 Qc1+ 41. Kf3 Rh3+ 42. Kg2 Qh1+ 1/2-1/2

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Bakker, Sven"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "A81"]
[WhiteElo "2140"]
[PlyCount "99"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 0-0 5. 0-0 d5 6. b3 c5 7. e3 Ne4 8. Bb2 Nc6 9. Nbd2 f5 10. Ne5 Nxe5 11. dxe5 Qc7 12. f4 Be6 13. Nxe4 dxe4 14. Qe2 c4 15. Bd4 Rfc8 16. Rfd1 b5 17. b4 a5 18. Bc5 Rd8 19. a3 Bd5 20. Qd2 e6 21. Qd4 Ra6 22. bxa5 Qxa5 23. Bf1 Rda8 24. g4 Qd8 25. gxf5 gxf5 26. Be2 Bf8 27. Kh1 Bxc5 28. Rg1+ Kh8 29. Qxc5 Qf8 30. Qxb5 Rxa3 31. Rxa3 Rxa3 32. Bxc4 Bxc4 33. Qxc4 Qe8 34. Qc7 Qf8 35. Qd7 Rxe3 36. Qxe6 Ra3 37. Qd5 Qa8 38. c4 Ra1 39. Qxa8+ Rxa8 40. Rc1 Ra6 41. Kg1 Kg7 42. c5 Kf7 43. c6 Ra8 44. c7 Rc8 45. Rc6 Ke7 46. e6 Ke8 47. Kf2 Ke7 48. Ke3 Ke8 49. Kd4 Ke7 50. Ke5 1-0

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "3"]
[White "Blaas, Stefan"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B26"]
[PlyCount "60"]
[EventDate "1998.07.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Be3 Rb8 7. Qd2 b5 8. Nge2 Nd4 9. 0-0 Qa5 10. Nxd4 cxd4 11. Nd1 b4 12. Bg5 h6 13. f4 hxg5 14. fxg5 e5 15. Qf2 Be6 16. h4 Ne7 17. Qf3 0-0 18. g4 d5 19. Nf2 f6 20. gxf6 Rxf6 21. Qg3 Rf4 22. Bh3 Rbf8 23. g5 Qb6 24. Bg2 dxe4 25. Bxe4 Bd5 26. Bxd5+ Nxd5 27. Ne4 Ne3 28. Rxf4 Rxf4 29. Nf6+ Bxf6 30. gxf6 Rg4 0-1

[Event "Vlissingen HZ op 02nd"]
[Site "Vlissingen"]
[Date "1998.??.??"]
[Round "4"]
[White "Bliek, Wouter"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "D90"]
[PlyCount "68"]
[EventDate "1998.07.??"]
[EventType "swiss"]
[EventRounds "7"]
[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 d5 4. Nf3 Bg7 5. cxd5 Nxd5 6. Qb3 Nb6 7. Bg5 0-0 8. e3 a5 9. Bb5 c6 10. Be2 Re8 11. 0-0 Na6 12. Rac1 Be6 13. Qd1 Nb4 14. a3 N4d5 15. Ne4 h6 16. Bh4 Qb8 17. Bg3 Qa7 18. Nc5 Bg4 19. e4 Nf6 20. Ne5 Bxe2 21. Qxe2 Rad8 22. f4 Nbd7 23. Nxf7 Kxf7 24. Qc4+ e6 25. Nxe6 Rxe6 26. f5 Nf8 27. fxe6+ Nxe6 28. Bf2 Nxe4 29. d5 Nxf2 30. dxe6+ Ke7 31. Rxf2 Bd4 32. Qf1 Rf8 33. Rcc2 Rxf2 34. Rxf2 Bxf2+ 0-1

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "1"]
[White "Dekker, Jop"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B22"]
[PlyCount "115"]
[EventDate "1998.07.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 e6 5. Bc4 b6 6. Bxd5 exd5 7. d4 Ba6 8. dxc5 Bxc5 9. Qxd5 Nc6 10. Bg5 f6 11. exf6 gxf6 12. Be3 Qe7 13. Kd1 Bxe3 14. Re1 0-0-0 15. Rxe3 Qg7 16. Nd4 Kb8 17. Rg3 Qh6 18. Qd6+ Ka8 19. Rh3 Qg5 20. Rg3 Qh5+ 21. Kc2 Rhe8 22. Nd2 Nxd4+ 23. Qxd4 Qf5+ 24. Kb3 Re2 25. Rd1 Rde8 26. Re3 R8xe3 27. fxe3 Bd3 28. e4 Qb5+ 29. Qb4 Qc6 30. Qd4 Qb5+ 31. Qb4 Qxb4+ 32. cxb4 Rxg2 33. Kc3 Bb5 34. Nf3 Be2 35. Ne1 Bxd1 36. Nxg2 Bf3 37. Ne3 Bxe4 38. Ng4 Bf5 39. Nxf6 Kb7 40. a3 Kc6 41. Kd4 Kd6 42. Nd5 Bb1 43. Nf4 Ba2 44. Ke4 Bb1+ 45. Kd4 Bc2 46. Nd5 Ba4 47. Nf4 Bc6 48. Nd3 Ke6 49. Nf2 Kf5 50. Ke3 h5 51. Nd3 h4 52. Nf2 Bb7 53. Nh3 Bg2 54. Nf2 d5 55. Nd3 Kg4 56. Nf2+ Kf5 57. Nd3 Be4 58. Nf2 0-1

[Event "Vlissingen HZ op 02nd"]
[Site "Vlissingen"]
[Date "1998.??.??"]
[Round "2"]
[White "Gurevich, Mikhail"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "A59"]
[WhiteElo "2635"]
[PlyCount "71"]
[EventDate "1998.07.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. e4 Bxf1 8. Kxf1 d6 9. g3 Bg7 10. Kg2 0-0 11. Nf3 Nbd7 12. Re1 Ng4 13. Nd2 Nge5 14. Qe2 Nb6 15. f4 Ned7 16. Nf3 Na4 17. Nd1 Ndb6 18. Rb1 Ra7 19. Bd2 c4 20. b3 Nc5 21. Bc3 Qa8 22. Bxg7 Kxg7 23. bxc4 Rxa2 24. Rb2 Ra6 25. e5 Rb8 26. Nf2 Rb7 27. exd6 exd6 28. Qd2 Qd8 29. Ng4 Nbd7 30. Rxb7 Nxb7 31. Qb2+ Nf6 32. Nxf6 Qxf6 33. Qxb7 Ra2+ 34. Kg1 Qc3 35. Qb1 Qa5 36. Qe4 1-0

[Event "Vlissingen HZ op 02nd"]
[Site "Vlissingen"]
[Date "1998.??.??"]
[Round "6"]
[White "Kalisvaart, Peter"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B50"]
[PlyCount "82"]
[EventDate "1998.07.??"]
[EventType "swiss"]
[EventRounds "7"]
[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. c3 Nf6 4. Bd3 Nbd7 5. 0-0 Ne5 6. Nxe5 dxe5 7. Bc2 g6 8. d3 Bg7 9. Be3 b6 10. d4 exd4 11. cxd4 Ng4 12. Ba4+ Bd7 13. Qxg4 Bxa4 14. e5 cxd4 15. Qxd4 Qxd4 16. Bxd4 0-0-0 17. Bc3 Rd5 18. Re1 Rhd8 19. Na3 Rd1 20. Raxd1 Rxd1 21. Rxd1 Bxd1 22. Nb5 Ba4 23. e6 f6 24. Nd4 f5 25. b3 Be8 26. f4 Bf6 27. Kf2 Kc7 28. Ke3 Kd6 29. Kd3 a5 30. a3 Kd5 31. g3 b5 32. b4 a4 33. h4 h6 34. Ne2 Bxc3 35. Nxc3+ Kxe6 36. Kd4 Kd6 37. Ne2 Bf7 38. Nc3 Bc4 39. Nd1 Be2 40. Nc3 Bf1 41. Nd1 Be2 1/2-1/2

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Berkvens, Joost"]
[Result "0-1"]
[ECO "E38"]
[PlyCount "66"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 Bxc5 6. Nf3 Qb6 7. e3 Qc7 8. a3 b6 9. Be2 Bb7 10. 0-0 a6 11. Rd1 Be7 12. b4 0-0 13. Bb2 d6 14. Rac1 Nbd7 15. Bd3 Rac8 16. Qe2 Rfd8 17. Nb1 Qb8 18. Nbd2 Qa8 19. e4 Bf8 20. Bb1 g6 21. Nd4 Bg7 22. f3 Nh5 23. Nf1 Bh6 24. Ne3 Ne5 25. Nb3 Bxe3+ 26. Qxe3 Nxc4 27. Rxc4 Rxc4 28. g4 Ng7 29. Qh6 e5 30. Rd3 Qc8 31. Nd2 Rc1+ 32. Bxc1 Qxc1+ 33. Kf2 Ne6 0-1

[Event "Vlissingen HZ op 02nd"]
[Site "Vlissingen"]
[Date "1998.??.??"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Burgerhoff, Rinus"]
[Result "1-0"]
[ECO "A40"]
[PlyCount "57"]
[EventDate "1998.07.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. a3 Bb7 4. Nc3 f5 5. d5 Nf6 6. g3 Bd6 7. Bg2 Qe7 8. Nh3 Na6 9. 0-0 Nc5 10. Nb5 a5 11. Be3 Nce4 12. Nd4 0-0 13. dxe6 dxe6 14. Ng5 Nxg5 15. Bxb7 c5 16. Bxg5 Rab8 17. Bxf6 Qxb7 18. Nb5 Bxg3 19. fxg3 Rxf6 20. Qd3 Rh6 21. Qf3 Qf7 22. Rad1 Qf6 23. Rd2 Rf8 24. Qc3 e5 25. Rd6 Qg5 26. Rxh6 gxh6 27. Qxe5 Qd2 28. Qd5+ Qxd5 29. cxd5 1-0

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Dambacher, Martijn"]
[Result "0-1"]
[ECO "A40"]
[BlackElo "2135"]
[PlyCount "74"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. Nf3 Bb7 4. a3 f5 5. d5 Nf6 6. Nc3 Be7 7. g3 0-0 8. Bg2 Ne4 9. Nxe4 fxe4 10. Ne5 exd5 11. cxd5 Qe8 12. 0-0 Qh5 13. Nc4 Qxd5 14. Qxd5+ Bxd5 15. Nd2 Nc6 16. Nxe4 Rae8 17. Bf4 Bxe4 18. Bxe4 Bf6 19. Bd5+ Kh8 20. e4 Bxb2 21. Ra2 Be5 22. Be3 Na5 23. Rc2 c6 24. Ba2 Bd6 25. Rd1 Bxa3 26. Rxd7 Rxe4 27. Bd4 Re7 28. Rxe7 Bxe7 29. Re2 Ba3 30. Re6 c5 31. Be5 c4 32. f4 Kg8 33. Bc3 Nb3 34. Re5 Rd8 35. Rg5 g6 36. Rb5 Bc5+ 37. Kg2 a6 0-1

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "De Boer, Sybolt"]
[Result "1/2-1/2"]
[ECO "E91"]
[BlackElo "2285"]
[PlyCount "121"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. Be2 Bg4 7. 0-0 c5 8. Be3 Bxf3 9. Bxf3 cxd4 10. Bxd4 Nc6 11. Be3 Nd7 12. Qd2 Qa5 13. Rac1 Rfc8 14. Bg4 Nce5 15. Bxd7 Nxd7 16. Nd5 Qxd2 17. Bxd2 Kf8 18. Bc3 Bxc3 19. Rxc3 a6 20. Rfc1 e6 21. Ne3 Ke7 22. f3 Rc6 23. Nc2 Rac8 24. Nd4 R6c7 25. a4 Ne5 26. b3 Nc6 27. Ne2 Nb4 28. Rd1 b5 29. axb5 axb5 30. Nd4 Rc5 31. Rb1 e5 32. Ne2 Ke6 33. g4 bxc4 34. bxc4 Rxc4 35. Rxb4 Rxc3 36. Nxc3 Rxc3 37. Kf2 Rc7 38. g5 Rc8 39. Rb7 h6 40. h4 Rh8 41. Kg3 Ra8 42. gxh6 Rh8 43. Kg4 Rxh6 44. Rb8 Rh7 45. Ra8 Rh5 46. Re8+ Kd7 47. Rg8 Ke7 48. Ra8 f5+ 49. Kg3 Rh6 50. Rb8 Kf7 51. Rd8 Ke7 52. Ra8 Rh5 53. Rg8 Kf7 54. Rd8 g5 55. hxg5 Rxg5+ 56. Kh4 Rg1 57. Rxd6 fxe4 58. fxe4 Re1 59. Kg4 Rxe4+ 60. Kf5 Re1 61. Rf6+ 1/2-1/2

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "6"]
[White "Keessen, Aldert Jan"]
[Black "Drel, Nicolai"]
[Result "1-0"]
[ECO "E37"]
[PlyCount "105"]
[EventDate "1998.07.01"]
[EventType "swiss"]
[EventRounds "6"]
[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. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 0-0 8. Nf3 Nd7 9. cxd5 exd5 10. Bf4 c6 11. e3 Ndf6 12. Bd3 Re8 13. h3 h6 14. 0-0 Nh5 15. Bh2 Nhf6 16. Ne5 Be6 17. b4 a6 18. a4 Nd6 19. Rfc1 Qe7 20. Qb3 Bd7 21. Bb1 Nfe4 22. Nxd7 Qxd7 23. Qd3 g6 24. Be5 Qe7 25. Ra2 Nf6 26. Re2 Nc4 27. Bf4 Qf8 28. Qb3 b5 29. a5 Re6 30. f3 Rae8 31. Rce1 Nh5 32. Bh2 Qe7 33. e4 Qh4 34. Qd3 Nf4 35. Bxf4 Qxf4 36. e5 Qh4 37. Kh2 Kg7 38. g3 Qe7 39. Qc3 f5 40. f4 Qf8 41. Rf2 h5 42. Rg1 Qh8 43. Rgg2 Rf8 44. Kg1 Kf7 45. g4 hxg4 46. hxg4 Ke7 47. Rh2 Qg7 48. Qh3 fxg4 49. Qxg4 Ne3 50. Qg5+ Kd7 51. f5 Nxf5 52. Bxf5 Rxf5 53. Rxf5 1-0

[Event "NED-chT"]
[Site "Netherlands"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Hoogendoorn, Joost"]
[Result "1/2-1/2"]
[ECO "A57"]
[BlackElo "2300"]
[PlyCount "126"]
[EventDate "1998.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3 axb5 6. e4 b4 7. Nb5 d6 8. Nf3 Nxe4 9. Bc4 g6 10. Qe2 f5 11. Ng5 Bg7 12. f3 Nxg5 13. Bxg5 Kf7 14. 0-0 h6 15. Bh4 g5 16. Bf2 Bf6 17. a3 bxa3 18. Rxa3 Rxa3 19. bxa3 Kg7 20. Rb1 Nd7 21. Qa2 Ne5 22. Bf1 f4 23. Be1 h5 24. Na7 Bf5 25. Rb7 Qa8 26. Qb3 c4 27. Qb4 Kg6 28. Nc6 Nxc6 29. dxc6 c3 30. Bxc3 Qe8 31. Bxf6 exf6 32. Qc3 Qe6 33. c7 Rc8 34. Ba6 d5 35. Bb5 Qd6 36. Bd3 Bxd3 37. Qxd3+ Kg7 38. Qf5 Rxc7 39. Rxc7+ Qxc7 40. Qxd5 Qa7+ 41. Kf1 Qxa3 42. Qd7+ Kh6 43. Qd8 Qc1+ 44. Kf2 Qe3+ 45. Kf1 Qe6 46. Qd3 Kg7 47. h3 Kh6 48. Qd4 Kg7 49. Kf2 Qe5 50. Qd7+ Kg6 51. Qc8 Qd4+ 52. Kf1 h4 53. Qe6 Qa1+ 54. Kf2 Qa7+ 55. Kf1 Qf7 56. Qc8 Qe7 57. Kf2 Kf7 58. Kf1 Qe6 59. Qd8 Kg6 60. Qd3+ f5 61. Qd8 g4 62. fxg4 fxg4 63. hxg4 Qxg4 1/2-1/2

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "2"]
[White "Keessen, Aldert Jan"]
[Black "Khenkin, Igor"]
[Result "0-1"]
[ECO "D43"]
[BlackElo "2565"]
[PlyCount "52"]
[EventDate "1998.07.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 h6 6. Bxf6 Qxf6 7. Qb3 Nd7 8. e4 dxe4 9. Nxe4 Qf4 10. Bd3 e5 11. 0-0 Be7 12. Rfe1 exd4 13. Ng3 Nc5 14. Qc2 Qc7 15. Nf5 Bxf5 16. Bxf5 0-0 17. Nxd4 Bf6 18. Rad1 Rad8 19. Ne2 g6 20. Bg4 Qa5 21. Nc1 Na4 22. b3 Nb2 23. b4 Qxb4 24. a3 Qa5 25. Nb3 Rxd1 26. Rxd1 Qg5 0-1

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "4"]
[White "Keessen, Aldert Jan"]
[Black "Knoppert, Erik"]
[Result "0-1"]
[ECO "A57"]
[BlackElo "2385"]
[PlyCount "122"]
[EventDate "1998.07.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3 Qa5 6. Bd2 axb5 7. e4 b4 8. e5 bxc3 9. Bxc3 Qa4 10. Qxa4 Rxa4 11. exf6 gxf6 12. Bb5 Ra8 13. a4 Rg8 14. g3 Bb7 15. 0-0-0 Rg5 16. Nh3 Rxd5 17. Nf4 Bh6 18. Kc2 Bxf4 19. gxf4 Rxd1 20. Rxd1 Bc6 21. Rg1 Kf8 22. Bd3 Rxa4 23. Bxh7 e6 24. Bxf6 Be4+ 25. Bxe4 Rxe4 26. Be5 Nc6 27. Bd6+ Ne7 28. Ra1 f6 29. Ra7 Ke8 30. Ra8+ Kf7 31. Rd8 Nf5 32. b3 Re2+ 33. Kc3 Rxf2 34. Bxc5 Rf3+ 35. Kb2 d5 36. b4 Rxf4 37. b5 Ra4 38. Kb3 Rc4 39. Bf2 Ke7 40. Rh8 Nd6 41. Rh7+ Kd8 42. b6 Kc8 43. Re7 e5 44. h4 Ne4 45. h5 Nxf2 46. h6 Nd3 47. h7 Nc5+ 48. Ka3 Ra4+ 49. Kb2 Rh4 50. Rc7+ Kb8 51. Rxc5 Rxh7 52. Rxd5 Rh3 53. Rd6 f5 54. Rf6 f4 55. Kc2 Kb7 56. Kd2 Re3 57. Re6 e4 58. Rf6 Rd3+ 59. Ke1 f3 60. Kf1 Rb3 61. Rf8 Rxb6 0-1

[Event "NED-chT"]
[Site "Netherlands"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Lemmers, Oscar"]
[Result "0-1"]
[ECO "A67"]
[BlackElo "2365"]
[PlyCount "118"]
[EventDate "1998.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 c5 2. d5 Nf6 3. c4 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. Bb5+ Nfd7 9. a4 0-0 10. Nf3 Na6 11. 0-0 Nc7 12. Bd3 a6 13. Bd2 Rb8 14. Be1 b5 15. e5 dxe5 16. d6 Ne6 17. Bh4 Bf6 18. Bxf6 Qxf6 19. Nd5 Qg7 20. axb5 axb5 21. Ra7 c4 22. Ne7+ Kh8 23. Nxc8 Nec5 24. Bc2 Rbxc8 25. fxe5 Nxe5 26. Qd5 Nxf3+ 27. Rxf3 Ne6 28. Rb7 Rcd8 29. Kh1 Qd4 30. Qxb5 Rxd6 31. h3 Rd5 32. Qb4 Kg8 33. Rf1 Nf4 34. Rb8 Ne6 35. Rxf8+ Nxf8 36. Qb7 Rd7 37. Qc8 Qxb2 38. Qxc4 Qd4 39. Qc8 Qd5 40. Ba4 Re7 41. Qb8 Re2 42. Qg3 Rb2 43. Be8 Rb7 44. Qc3 Re7 45. Qc8 Qe6 46. Qxe6 Nxe6 47. Bb5 Nd4 48. Bc4 Nf5 49. Ra1 h5 50. g4 hxg4 51. hxg4 Nh6 52. Ra6 Kg7 53. g5 Ng4 54. Ra5 Re1+ 55. Kg2 Ne3+ 56. Kf2 Nxc4 57. Rc5 Re4 58. Kf3 Rd4 59. Rc7 Nd6 0-1

[Event "Vlissingen HZ op 02nd"]
[Site "Vlissingen"]
[Date "1998.??.??"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Safin, Shukhrat"]
[Result "0-1"]
[ECO "E94"]
[BlackElo "2510"]
[PlyCount "66"]
[EventDate "1998.07.??"]
[EventType "swiss"]
[EventRounds "7"]
[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. Be2 0-0 6. Nf3 Na6 7. 0-0 e5 8. Be3 Ng4 9. Bg5 Qe8 10. Re1 exd4 11. Nxd4 Qe5 12. Nf3 Qc5 13. Bh4 Ne5 14. Rc1 Nxf3+ 15. Bxf3 Qb4 16. Rc2 Be6 17. e5 dxe5 18. b3 c6 19. Ne4 f6 20. Rd2 Nc5 21. Rd6 Nxe4 22. Bxe4 Rfe8 23. f3 Qa5 24. Re2 Rad8 25. Red2 Rxd6 26. Rxd6 Bf8 27. Rd2 Bb4 28. Re2 Rd8 29. Qb1 Kg7 30. Bd3 Qb6+ 31. Bf2 Bc5 32. Bxc5 Qxc5+ 33. Kh1 Qd4 0-1

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Sewkaransing, Vikash"]
[Result "1/2-1/2"]
[ECO "D20"]
[PlyCount "38"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. e4 e5 4. Nf3 exd4 5. Bxc4 Nc6 6. 0-0 Be6 7. Bxe6 fxe6 8. Ng5 Qd7 9. Qb3 0-0-0 10. Nxe6 Re8 11. Ng5 Nh6 12. Nd2 Be7 13. Ndf3 Ng4 14. h3 Nge5 15. Nxe5 Nxe5 16. Bf4 Bxg5 17. Bxg5 h6 18. Bf4 Nc6 19. f3 g5 1/2-1/2

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Van Beek, Alexander"]
[Result "1/2-1/2"]
[ECO "E06"]
[PlyCount "37"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. g3 Nf6 6. Bg2 Be7 7. 0-0 0-0 8. Ne5 c5 9. dxc5 Bxc5 10. Nxc4 Nc6 11. Bf4 Qe7 12. Bd6 Bxd6 13. Qxd6 Qxd6 14. Nxd6 e5 15. Rfd1 Rd8 16. h3 Kf8 17. Ncb5 Ke7 18. Nxc8+ Raxc8 19. Rac1 1/2-1/2

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Van Den Boomen, Ronny"]
[Result "1-0"]
[ECO "D13"]
[PlyCount "45"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Bf5 5. cxd5 cxd5 6. Qb3 b6 7. Bg5 e6 8. e4 dxe4 9. Bb5+ Ke7 10. Ne5 a6 11. Bc6 Ra7 12. d5 h6 13. 0-0-0 Qd6 14. Qxb6 Rc7 15. Nc4 Nbd7 16. Qa5 Rxc6 17. Nxd6 Rxd6 18. dxe6 Rxd1+ 19. Rxd1 fxe6 20. Bxf6+ gxf6 21. Qc7 e5 22. Nd5+ Ke8 23. Nxf6+ 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Van Veen, Oscar"]
[Result "0-1"]
[ECO "A04"]
[PlyCount "86"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. Nf3 h6 2. b3 Nf6 3. Bb2 d5 4. g3 g5 5. Bg2 Bg7 6. c4 dxc4 7. bxc4 0-0 8. Qc2 Na6 9. Nc3 c6 10. Rd1 Be6 11. d3 Qc8 12. 0-0 Bh3 13. d4 Rd8 14. Qb1 Nh5 15. d5 Bxg2 16. Kxg2 Bxc3 17. Bxc3 cxd5 18. Ba1 dxc4 19. Rxd8+ Qxd8 20. Qxb7 Nc5 21. Qc6 Ne6 22. Qxc4 Rc8 23. Qb3 Qc7 24. Qb2 Nf6 25. Ne5 Qc2 26. Qb7 Rc7 27. Qb8+ Kg7 28. e3 Qxa2 29. h4 Rc2 30. hxg5 Nxg5 31. Qa8 Qe6 32. Rh1 Qf5 33. Rf1 Ra2 34. Bd4 Ra5 35. g4 Qe6 36. f4 Ra2+ 37. Kh1 Qa6 38. Re1 Qa5 39. Rg1 Nh3 40. Rg2 Qe1+ 41. Kh2 Nf2 42. Kg3 N2e4+ 43. Kh2 Rxg2+ 0-1

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Van der Kuyl, Alexander"]
[Result "1-0"]
[ECO "E91"]
[PlyCount "47"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Nf3 Nbd7 7. 0-0 c6 8. Qc2 Qc7 9. Rd1 a6 10. Bg5 e5 11. Rac1 Re8 12. h3 h5 13. b4 b6 14. Qb1 Rb8 15. a4 c5 16. dxe5 dxe5 17. b5 a5 18. Nd5 Qb7 19. Nd2 Qa7 20. Nf1 Nh7 21. Ne7+ Rxe7 22. Bxe7 Nhf6 23. Bf3 Nf8 24. Bd6 1-0

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Keessen, Aldert Jan"]
[Black "Willemze, Jeroen"]
[Result "1/2-1/2"]
[ECO "A57"]
[BlackElo "2290"]
[PlyCount "36"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3 axb5 6. e4 b4 7. Nb5 d6 8. Bc4 Nbd7 9. Nf3 Nb6 10. Bd3 g6 11. b3 Bg7 12. Bb2 0-0 13. 0-0 Ra5 14. a4 Ba6 15. Re1 Qd7 16. Nd2 Qb7 17. Nc4 Nxc4 18. Bxc4 Nd7 1/2-1/2

[Event "Vlissingen HZ op 02nd"]
[Site "Vlissingen"]
[Date "1998.??.??"]
[Round "1"]
[White "Keessen, Aldert Jan"]
[Black "Zweedijk, Leon"]
[Result "1-0"]
[ECO "E91"]
[PlyCount "53"]
[EventDate "1998.07.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 g6 4. e4 Bg7 5. Nf3 0-0 6. Be2 c6 7. 0-0 a6 8. Qc2 Qc7 9. a4 Ne8 10. Be3 f5 11. Qd2 Nf6 12. exf5 Bxf5 13. d5 Ng4 14. Bd4 e5 15. dxe6 Bh6 16. Ng5 Qe7 17. f4 Bxg5 18. fxg5 Qxe6 19. Bxg4 Bxg4 20. Rxf8+ Kxf8 21. Re1 Qd7 22. Qf4+ Bf5 23. g4 c5 24. gxf5 cxd4 25. fxg6+ Kg8 26. Nd5 Qg7 27. Re8+ 1-0

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "5"]
[White "Leenhouts, Koen"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B15"]
[PlyCount "103"]
[EventDate "1998.07.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 g6 2. e4 c6 3. Nc3 d5 4. Be3 Nf6 5. e5 Ng4 6. Bf4 h5 7. h3 Nh6 8. g4 hxg4 9. hxg4 Bxg4 10. Qd2 Bh5 11. Be2 Nf5 12. 0-0-0 e6 13. Bg4 Nh4 14. f3 Be7 15. Nge2 Ng2 16. Bxh5 gxh5 17. Rdg1 Nh4 18. Rh3 Nd7 19. Bg5 Ng6 20. f4 Ndf8 21. Bxe7 Nxe7 22. Rg5 h4 23. Ng3 Qb6 24. Na4 Qa6 25. Nc5 Qxa2 26. Qb4 b6 27. Nb7 Nfg6 28. Nd6+ Kf8 29. Ne2 Qa1+ 30. Kd2 Qf1 31. f5 Nf4 32. Re3 Nxe2 33. f6 c5 34. fxe7+ Kxe7 35. dxc5 d4 36. Rxe2 Qf4+ 37. Kd1 Qxg5 38. cxb6 Qg1+ 39. Re1 Qg4+ 40. Kc1 Qf4+ 41. Kb1 f6 42. Nc8+ Kf7 43. Qe7+ Kg6 44. Rg1+ Kf5 45. Qxf6+ Ke4 46. Re1+ Qe3 47. Rxe3+ dxe3 48. Qxh8 e2 49. Qxh4+ Ke3 50. Qg3+ Kd2 51. Qf4+ Ke1 52. b7 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Markus, Aernout"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B25"]
[PlyCount "112"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 e6 7. Nf3 Nge7 8. 0-0 0-0 9. Be3 b6 10. Qd2 Bb7 11. Rae1 Qd7 12. Nd1 Rad8 13. c3 d5 14. e5 d4 15. cxd4 Nxd4 16. Bxd4 cxd4 17. Rf2 Rc8 18. Ng5 Bxg2 19. Rxg2 Qd5 20. a3 Qb3 21. Ne4 Rc6 22. Nd6 Nf5 23. Nc4 h5 24. h3 Rfc8 25. g4 Nh4 26. Rf2 Rxc4 27. dxc4 Nf3+ 28. Rxf3 Qxf3 29. Qxd4 Qg3+ 30. Kf1 Qxh3+ 31. Ke2 Qxg4+ 32. Kf1 Qh4 33. Nf2 Bh6 34. Re4 Qg3 35. Nd3 Qf3+ 36. Kg1 h4 37. Qe3 Qg4+ 38. Kh2 Rd8 39. Nf2 Qf5 40. Nh3 Rd1 41. Qe2 Rb1 42. Rd4 Rc1 43. Re4 a5 44. Qg2 Rd1 45. Qe2 Kh7 46. Qe3 Rd2+ 47. Qxd2 Qxe4 48. b3 Qf3 49. Qe1 Bxf4+ 50. Nxf4 Qxf4+ 51. Kg1 Kg7 52. Qe2 Qg3+ 53. Kh1 Qxb3 54. Qf2 Qb1+ 55. Kh2 Qf5 56. Qxh4 Qh5 0-1

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Pot, Erik"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B66"]
[PlyCount "44"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. 0-0-0 h6 9. Bf4 Bd7 10. Nxc6 Bxc6 11. f3 d5 12. Qe1 Bb4 13. Be5 Nxe4 14. fxe4 Qg5+ 15. Kb1 Qxe5 16. exd5 Qxe1 17. Rxe1 Bxc3 18. Re3 Bxd5 19. Rxc3 0-0 20. Rg3 Rad8 21. Bd3 e5 22. Re3 Rfe8 1/2-1/2

[Event "Vlissingen HZ op 02nd"]
[Site "Vlissingen"]
[Date "1998.??.??"]
[Round "7"]
[White "Van Driel, Eric"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "E12"]
[PlyCount "117"]
[EventDate "1998.07.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. a3 Nf6 4. Nc3 Bb7 5. Nf3 d5 6. Bg5 Be7 7. cxd5 Nxd5 8. Bxe7 Qxe7 9. Nxd5 exd5 10. e3 0-0 11. Bd3 Nd7 12. Qc2 Nf6 13. Rc1 c6 14. b4 a5 15. Qb3 axb4 16. axb4 b5 17. 0-0 Ra4 18. Rb1 Rfa8 19. Rfc1 Ra3 20. Qd1 R3a4 21. Qd2 R8a6 22. Qc3 Ra3 23. Rb3 Rxb3 24. Qxb3 Ra4 25. Rb1 h6 26. Qc3 Ne4 27. Bxe4 Qxe4 28. Ra1 Qc2 29. Qe1 Qb3 30. h3 Rxa1 31. Qxa1 Qxb4 32. Qa7 Qe7 33. Ne5 Qc7 34. Nd3 Qc8 35. Nc5 Ba8 36. Kf1 Qd8 37. Ke2 Qc8 38. Kd2 Qd8 39. Nd7 Qe8 40. Nb6 Bb7 41. Qxb7 Kh7 42. f3 Qe6 43. Nd7 Qd6 44. Qc8 Qb4+ 45. Ke2 Qb2+ 46. Kf1 Qc1+ 47. Kf2 Qd2+ 48. Kg3 Qxe3 49. Qxc6 Qg5+ 50. Kh2 Qf4+ 51. Kh1 Qxd4 52. Qxb5 h5 53. Qb1+ g6 54. Qb3 h4 55. Qxd5 Qa1+ 56. Kh2 Kg8 57. Ne5 Qa7 58. Nxg6 Qb8+ 59. Qe5 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Van Gils, Philip"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B25"]
[PlyCount "55"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Nce2 e5 7. c3 Nge7 8. Be3 0-0 9. f4 b6 10. Nf3 exf4 11. Nxf4 d5 12. Rc1 h6 13. 0-0 Bb7 14. Qe2 dxe4 15. dxe4 Ne5 16. Nxe5 Bxe5 17. Rcd1 Qe8 18. Nd3 Bg7 19. Bf4 Rd8 20. Nf2 Qa4 21. b3 Qc6 22. Ng4 Kh7 23. Rxd8 Rxd8 24. Bxh6 f5 25. Bxg7 Kxg7 26. exf5 Qxg2+ 27. Qxg2 Bxg2 28. f6+ 1-0

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Van Otten, Gerard J"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B74"]
[PlyCount "60"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Be2 g6 7. 0-0 Bg7 8. Nb3 0-0 9. Kh1 Be6 10. f4 Rc8 11. f5 Bd7 12. Be3 Ne5 13. Bd4 Nc4 14. Bxc4 Rxc4 15. Qe2 Qc7 16. Rad1 a6 17. Rf2 b5 18. a3 Qd8 19. Rff1 Qa8 20. Rd3 a5 21. Nd2 Rcc8 22. fxg6 fxg6 23. b4 axb4 24. axb4 Ng4 25. Bxg7 Kxg7 26. Rdf3 Rxf3 27. Rxf3 Rxc3 28. Rxc3 Qa1+ 29. Qf1 Qxc3 30. Nf3 Qe3 0-1

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Van Zutphen, Jimmy"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "B15"]
[PlyCount "98"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. Nc3 c6 2. e4 g6 3. d4 d5 4. f3 dxe4 5. Nxe4 Bg7 6. c3 Nd7 7. Bc4 Ngf6 8. Ne2 0-0 9. 0-0 Qb6 10. Qb3 Qxb3 11. Bxb3 Nxe4 12. fxe4 e5 13. Bg5 Kh8 14. Rxf7 Rxf7 15. Bxf7 Nf6 16. Ng3 exd4 17. cxd4 Ng4 18. Rd1 Bd7 19. e5 Be8 20. Be6 Nh6 21. Ne4 Nf7 22. Bf6 b6 23. a3 Nd8 24. Bxg7+ Kxg7 25. Bb3 Bd7 26. d5 cxd5 27. Bxd5 Rc8 28. Bb3 Bg4 29. Rd2 h5 30. h3 Bf5 31. Nd6 Rc1+ 32. Kf2 Be6 33. Bxe6 Nxe6 34. Ne4 Rc7 35. g4 hxg4 36. hxg4 Kf7 37. Nf6 Nc5 38. Ke3 g5 39. Ne4 Ke6 40. Nxg5+ Kxe5 41. Nf3+ Ke6 42. Nd4+ Ke5 43. b4 Na4 44. Nb5 Rh7 45. Rg2 Rh3+ 46. Kd2 a6 47. Nc7 Rxa3 48. Re2+ Kf4 49. Nd5+ Kxg4 1/2-1/2

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Vink, Nico"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B65"]
[WhiteElo "2235"]
[PlyCount "56"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. 0-0-0 Nxd4 9. Qxd4 0-0 10. f4 Qa5 11. Be2 Bd7 12. Kb1 Bc6 13. Bf3 Rad8 14. g4 Rd7 15. Qd2 Qb6 16. Rhe1 Rfd8 17. Qg2 h6 18. Bxh6 d5 19. exd5 Nxd5 20. Nxd5 Bxd5 21. Bxd5 Rxd5 22. Rxd5 Rxd5 23. Bg5 Ba3 24. c3 Bxb2 25. Qg1 Rc5 26. Bd8 Qb5 27. c4 Rxc4 28. a4 Qb3 0-1

[Event "NED-ch U20"]
[Site "Leiden"]
[Date "1998.??.??"]
[Round "?"]
[White "Wunnink, Michael"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "D91"]
[WhiteElo "2095"]
[PlyCount "85"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5 Ne4 6. cxd5 Nxg5 7. Nxg5 e6 8. Qd2 exd5 9. Qe3+ Kf8 10. Qf4 Qf6 11. Qxc7 Na6 12. Qg3 Nb4 13. Rc1 Bf5 14. e3 Qb6 15. Be2 Nc2+ 16. Rxc2 Bxc2 17. Nxd5 Qa5+ 18. Nc3 Bf6 19. h4 h6 20. Nf3 b5 21. 0-0 b4 22. Nb5 Kg7 23. Rc1 Rhc8 24. Nd6 Qxa2 25. e4 Qxb2 26. Qf4 Rf8 27. Bc4 Bb3 28. Ne5 Qxd4 29. Ng4 Be5 30. Qxh6+ Kg8 31. Qxg6+ Bg7 32. Nh6+ Kh8 33. Ndxf7+ Rxf7 34. Nxf7+ Kg8 35. Bxb3 Qb2 36. Nh6+ Kh8 37. Nf7+ Kg8 38. Ng5+ Qxb3 39. Qh7+ Kf8 40. Qf5+ Kg8 41. Rc7 Qd1+ 42. Kh2 Qd6+ 43. f4 1-0

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "8"]
[White "Dambacher, Martijn"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "A41"]
[WhiteElo "2115"]
[PlyCount "145"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. c4 g6 2. Nc3 Bg7 3. d4 d6 4. Nf3 Bg4 5. e3 Nc6 6. Be2 e5 7. 0-0 exd4 8. Nxd4 Bxe2 9. Ndxe2 Nf6 10. b3 0-0 11. Bb2 Nd7 12. Qc2 Nc5 13. Nd5 Nd7 14. Rad1 Ne7 15. Bxg7 Kxg7 16. Nef4 Nc8 17. e4 c6 18. Ne3 Qf6 19. Ne2 Kh8 20. f4 Qg7 21. Ng3 a5 22. e5 f5 23. exd6 b6 24. Rd2 Re8 25. Rf3 Re6 26. Qd1 Ra7 27. Nc2 Nc5 28. Nd4 Rxd6 29. Nxc6 Rad7 30. Rxd6 Rxd6 31. Qe2 Qd7 32. Ne5 Rd1+ 33. Nf1 Qd4+ 34. Qe3 Ne4 35. Qxd4 Rxd4 36. Rd3 Rxd3 37. Nxd3 Nc3 38. a3 Nd6 39. Nd2 Nde4 40. Nxe4 fxe4 41. Ne5 Nb1 42. a4 Nd2 43. Kf2 Kg7 44. Ke3 Nxb3 45. Nd7 Kf7 46. Kxe4 Ke6 47. Nxb6 Kd6 48. Kd3 Kc6 49. Nd5 Nc5+ 50. Kc2 Nxa4 51. Nf6 Nb6 52. Kc3 a4 53. Nxh7 a3 54. Nf8 Nxc4 55. Kb3 Ne3 56. g3 Nf1 57. Nxg6 Nxh2 58. Kxa3 Kd5 59. Kb4 Ke4 60. Kc5 Nf1 61. g4 Ne3 62. g5 Nf5 63. Kc6 Ng7 64. Kd7 Kf5 65. Nf8 Kxf4 66. g6 Kf5 67. Ke7 Ne6 68. Kf7 Ng5+ 69. Kg7 Ne4 70. Kh8 Ng5 71. g7 Nf7+ 72. Kh7 Ng5+ 73. Kh6 1-0

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "5"]
[White "Houben, Jaap"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B73"]
[PlyCount "93"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[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 g6 7. Be3 Bg7 8. 0-0 0-0 9. h3 d5 10. exd5 Nxd5 11. Nxd5 Qxd5 12. Bf3 Qa5 13. c3 Rd8 14. Bxc6 bxc6 15. Nxc6 Rxd1 16. Nxa5 Rd5 17. Nc6 Bf6 18. Rfd1 e6 19. Rxd5 exd5 20. Bxa7 Bb7 21. Bd4 Bxc6 22. Bxf6 Ba4 23. Re1 Ra6 24. Bd4 Re6 25. Rxe6 fxe6 26. Kf1 Kf7 27. Ke2 Bb5+ 28. Ke3 Bf1 29. Kf3 Bc4 30. b3 Bd3 31. g3 Bb1 32. a3 Bc2 33. b4 Ba4 34. Kf4 h5 35. Ke5 Ke7 36. Bc5+ Kd7 37. Kf6 Bc2 38. h4 Bd3 39. a4 Bc2 40. a5 Bd3 41. f4 Be2 42. Kxg6 Kc6 43. a6 Bf3 44. Bd4 Bg4 45. b5+ Kc7 46. b6+ Kc8 47. b7+ 1-0

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "6"]
[White "Keessen, Aldert Jan"]
[Black "Brouwers, Geert"]
[Result "1-0"]
[ECO "D52"]
[PlyCount "57"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Nd2 Be7 8. Bd3 0-0 9. 0-0 a6 10. e4 dxc4 11. Bxf6 Bxf6 12. Nxc4 Qc7 13. e5 Be7 14. f4 f5 15. g4 Nb6 16. Ne3 Nd5 17. Ncxd5 cxd5 18. gxf5 exf5 19. Nxd5 Qd8 20. Nxe7+ Qxe7 21. Qb3+ Kh8 22. Qb6 g5 23. d5 gxf4 24. e6 Qf6 25. Rae1 h5 26. Kh1 Rg8 27. Rxf4 Qg5 28. Qd4+ Kh7 29. Rg1 1-0

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "2"]
[White "Keessen, Aldert Jan"]
[Black "Kalisvaart, Peter"]
[Result "1/2-1/2"]
[ECO "D38"]
[PlyCount "72"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 Nf6 3. c4 Bb4+ 4. Nc3 d5 5. Bg5 h6 6. Bh4 c5 7. cxd5 Qa5 8. Bxf6 Bxc3+ 9. bxc3 Qxc3+ 10. Nd2 gxf6 11. e3 Nd7 12. Rc1 Qa5 13. dxe6 fxe6 14. dxc5 Ke7 15. Qg4 Ne5 16. Qg7+ Nf7 17. Be2 Bd7 18. Bh5 Be8 19. Rd1 Qxc5 20. Qxf6+ Kxf6 21. Ne4+ Ke7 22. Nxc5 Bc6 23. 0-0 Rhd8 24. f4 Rd5 25. Rxd5 Bxd5 26. e4 Rc8 27. exd5 Rxc5 28. dxe6 Rxh5 29. exf7 Kxf7 30. Rc1 Rb5 31. Rc7+ Kf6 32. Kf2 Rb2+ 33. Kf3 Rxa2 34. Rxb7 Ra3+ 35. Kg4 Ra2 36. g3 Rxh2 1/2-1/2

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "4"]
[White "Keessen, Aldert Jan"]
[Black "Remmel, Tim"]
[Result "0-1"]
[ECO "E94"]
[PlyCount "86"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[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 d6 5. Be2 0-0 6. Nf3 e5 7. 0-0 Nh5 8. Bg5 f6 9. Be3 Nf4 10. Qd2 Nxe2+ 11. Nxe2 Nc6 12. dxe5 dxe5 13. Qd5+ Rf7 14. Rfd1 Qe8 15. Ne1 Bf8 16. Qd3 Be6 17. Qc2 Nb4 18. Qc3 Qc6 19. c5 Qb5 20. Nc1 a5 21. a3 Nc6 22. Ncd3 Rd8 23. Nc2 Rfd7 24. a4 Qc4 25. Ra3 Nb4 26. Nce1 Qxe4 27. Rd2 Bd5 28. Nc1 Bc6 29. f3 Qf5 30. Qc4+ Bd5 31. Qe2 Qe6 32. Rc3 c6 33. Qf2 Bg7 34. Ned3 Nxd3 35. Rcxd3 h6 36. Ne2 f5 37. Rd1 Kh7 38. f4 Bc4 39. Rxd7 Rxd7 40. Rxd7 Qxd7 41. Nc3 Qd3 42. fxe5 Bxe5 43. g4 Bxc3 0-1

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "9"]
[White "Keessen, Aldert Jan"]
[Black "Velema, Sander"]
[Result "1-0"]
[ECO "A42"]
[PlyCount "33"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 Nd7 5. Be2 e5 6. Nf3 Ne7 7. 0-0 0-0 8. Be3 h6 9. Qd2 Kh7 10. Rad1 f5 11. dxe5 dxe5 12. exf5 gxf5 13. Qc2 Qe8 14. Nd5 Qd8 15. Ng5+ hxg5 16. Bxg5 Rf7 17. Bh5 1-0

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "1"]
[White "Marx, Gemma"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B72"]
[PlyCount "94"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[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 g6 7. Be3 Bg7 8. Qd2 0-0 9. 0-0-0 Nxd4 10. Bxd4 Be6 11. h3 Qa5 12. Kb1 Rfc8 13. a3 Rab8 14. g4 b5 15. Nd5 Qxd2 16. Rxd2 Bxd5 17. exd5 Ne4 18. Rdd1 b4 19. a4 Bxd4 20. Rxd4 Nc5 21. b3 g5 22. f4 gxf4 23. Rxf4 Nd7 24. Bb5 Nf6 25. Bc6 Kg7 26. Rhf1 Rf8 27. Re1 Ng8 28. a5 Rfc8 29. g5 e5 30. dxe6 fxe6 31. Bd7 e5 32. Bxc8 exf4 33. Ba6 Kg6 34. Rg1 Re8 35. Bd3+ Kg7 36. Rf1 Rf8 37. h4 Ne7 38. h5 h6 39. g6 Nd5 40. Bc4 Ne3 41. Rf3 Nxc4 42. bxc4 Rf5 43. Kb2 Kf6 44. Kb3 Ke5 45. Kxb4 Rxh5 46. Kc3 Rg5 47. Kb3 Rxg6 0-1

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "3"]
[White "Van Tellingen, Frank"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "B89"]
[PlyCount "70"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[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. Bc4 e6 7. Be3 Be7 8. Qe2 a6 9. 0-0-0 Qc7 10. Bb3 0-0 11. Rhg1 Nd7 12. g4 Nc5 13. g5 Bd7 14. Qh5 g6 15. Qh6 Rfc8 16. Rg3 Bf8 17. Qh4 Nxd4 18. Bxd4 Nxb3+ 19. axb3 e5 20. Rd2 Be6 21. Be3 b5 22. Rh3 Bg7 23. Qxh7+ Kf8 24. Nd5 Bxd5 25. exd5 a5 26. f4 a4 27. b4 a3 28. bxa3 Qc4 29. Bb6 Qa2 30. Kd1 Qb1+ 31. Ke2 exf4 32. Rhd3 Rxc2 33. Qh3 Re8+ 34. Kf3 Rxd2 35. Rxd2 Qe4+ 0-1

[Event "NED-ch U20"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "7"]
[White "Van de Laar, Clement"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "E38"]
[PlyCount "64"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[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 c5 3. Nf3 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Qc2 0-0 7. e3 d5 8. cxd5 exd5 9. Bd2 Be7 10. Be2 Nc6 11. Nxc6 bxc6 12. 0-0 Bb7 13. Bd3 c5 14. b3 Bd6 15. h3 Qe7 16. Ne2 Rac8 17. Qb2 Ne4 18. Bxe4 Qxe4 19. Rac1 d4 20. f3 Qe5 21. e4 c4 22. bxc4 Qh2+ 23. Kf2 d3 24. Rh1 Bc5+ 25. Be3 Bxe3+ 26. Kxe3 Qxg2 27. Qxb7 Qxe2+ 28. Kf4 Rc5 29. Qb4 Qf2 30. Rhg1 g5+ 31. Rxg5+ Rxg5 32. Kxg5 Qe3+ 0-1

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "4"]
[White "Aubel, Jochem"]
[Black "Keessen, Aldert Jan"]
[Result "1/2-1/2"]
[ECO "A59"]
[PlyCount "59"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. e4 Bxf1 8. Kxf1 d6 9. Nf3 Bg7 10. g3 0-0 11. Kg2 Nbd7 12. Re1 Ng4 13. Nd2 Nge5 14. Qe2 Nb6 15. f4 Ned7 16. a4 Qc8 17. a5 Qa6 18. Ra3 Nc8 19. Qxa6 Rxa6 20. Nb5 Ra8 21. Ra2 Na7 22. Nxa7 Rxa7 23. Nc4 Rb8 24. Re2 Rb4 25. Rc2 Rb3 26. Re2 Rb4 27. Rc2 Rb3 28. Ra3 Rxa3 29. bxa3 f5 30. e5 1/2-1/2

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "1"]
[White "Keessen, Aldert Jan"]
[Black "Bargboer, G."]
[Result "1-0"]
[ECO "D07"]
[PlyCount "51"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 d5 2. c4 Nf6 3. cxd5 Nxd5 4. Nf3 Nc6 5. e4 Nf6 6. d5 Na5 7. Qa4+ c6 8. b4 Nxe4 9. bxa5 Qxd5 10. Bc4 Qf5 11. Be3 Be6 12. Nd4 Qg4 13. Bxe6 fxe6 14. 0-0 Nc5 15. Qc4 e5 16. Qxc5 exd4 17. Bxd4 e6 18. Qe5 Rd8 19. Bc3 Rg8 20. Nd2 Bd6 21. Qe4 Bf4 22. g3 Rf8 23. f3 Qg5 24. Qxe6+ Qe7 25. Qxe7+ Kxe7 26. gxf4 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "7"]
[White "Keessen, Aldert Jan"]
[Black "Beljaars, Arno"]
[Result "1-0"]
[ECO "E20"]
[PlyCount "59"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. g3 Bb7 6. Bg2 c5 7. 0-0 cxd4 8. Qxd4 Nc6 9. Qd3 0-0 10. Bf4 Na5 11. b3 d6 12. Qc2 Rc8 13. a3 Bxc3 14. Qxc3 d5 15. Rfd1 b5 16. Ne5 bxc4 17. bxc4 Nxc4 18. Nxc4 Ba6 19. Qa5 Bxc4 20. Qxa7 Bxe2 21. Rdb1 Ra8 22. Qe3 Bc4 23. Rb7 Ra6 24. Qc5 Nd7 25. Qb4 Rb6 26. Rxd7 Qxd7 27. Qxb6 f6 28. Bh3 Re8 29. Re1 d4 30. Re4 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "9"]
[White "Keessen, Aldert Jan"]
[Black "Berendsen, Richard"]
[Result "1/2-1/2"]
[ECO "D27"]
[PlyCount "43"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 a6 6. a4 c5 7. 0-0 Nc6 8. Qe2 cxd4 9. Rd1 Be7 10. exd4 0-0 11. Nc3 Nb4 12. Ne5 b6 13. Bg5 Bb7 14. Rac1 h6 15. Bf4 Nfd5 16. Bd2 Bg5 17. Qg4 Bxd2 18. Rxd2 Rc8 19. Re1 Qg5 20. Qxg5 hxg5 21. Bxd5 Bxd5 22. Nd7 1/2-1/2

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Blom, Gerben"]
[Result "1-0"]
[ECO "E21"]
[PlyCount "59"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. g3 Bb7 6. Bg2 0-0 7. 0-0 c5 8. Bg5 h6 9. Bf4 d5 10. cxd5 Bxc3 11. bxc3 Nxd5 12. Bd2 Nd7 13. Qa4 Qc7 14. Rfd1 Bc6 15. Qa3 Qb7 16. dxc5 Nxc5 17. Nd4 Ne7 18. Nxc6 Nxc6 19. Be3 Nd7 20. Qd6 Ndb8 21. a4 Rc8 22. a5 b5 23. Rab1 Rc7 24. Rxb5 Qc8 25. Rc5 a6 26. Rc4 Qb7 27. Bb6 Rd7 28. Qxd7 Nxd7 29. Bxc6 Qb8 30. Rxd7 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Van Essen, Mark"]
[Result "1-0"]
[ECO "E99"]
[PlyCount "83"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[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. Bd2 f4 12. Rc1 g5 13. f3 h5 14. Qc2 Rf7 15. a4 Bf8 16. Nb5 Nf6 17. c5 Ng6 18. cxd6 cxd6 19. Nf2 a6 20. Nc7 Rb8 21. Ne6 Bxe6 22. dxe6 Rg7 23. h3 Nh4 24. Qb3 Kh8 25. Rc2 d5 26. Rd1 d4 27. Rdc1 Bd6 28. Bb4 Qb6 29. Rc4 a5 30. Bxd6 Qxb3 31. Bxb8 Ng6 32. Nd3 g4 33. Kh2 gxf3 34. gxf3 Nh4 35. Bxe5 Rg2+ 36. Kh1 Rxe2 37. Bxf6+ Kh7 38. Rc7+ Kg6 39. e7 Qxa4 40. Bxh4 Kf7 41. e8Q+ Kxe8 42. Re7+ 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "6"]
[White "Lytchak, Alexander"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "A57"]
[WhiteElo "2265"]
[PlyCount "209"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. b6 e6 6. Nc3 Nxd5 7. Nxd5 exd5 8. Qxd5 Nc6 9. Nf3 Rb8 10. Bg5 Be7 11. Ne5 0-0 12. Nxc6 dxc6 13. Qxd8 Bxd8 14. Bxd8 Rxd8 15. e3 Be6 16. b3 c4 17. bxc4 Rxb6 18. c5 Rb2 19. Bxa6 Ra8 20. Bd3 Raxa2 21. Rxa2 Rxa2 22. 0-0 Ra3 23. Rb1 g5 24. Be4 Rc3 25. Bxc6 Rxc5 26. Be4 Bf5 27. Bxf5 Rxf5 28. g3 Kg7 29. Kg2 g4 30. Rb4 h5 31. Rf4 Ra5 32. h3 gxh3+ 33. Kxh3 Kg6 34. Rb4 Ra2 35. Kg2 Ra5 36. Rb6+ Kg5 37. Kh3 Ra4 38. Rd6 Rb4 39. Rd5+ Kg6 40. Kg2 Ra4 41. Kf3 Rb4 42. e4 Rb2 43. Ke3 Ra2 44. f4 Ra3+ 45. Rd3 Ra4 46. Rd6+ Kg7 47. f5 Ra1 48. Kf4 f6 49. Rd7+ Kg8 50. Rd2 Rh1 51. Rf2 Kf7 52. Kf3 Kg7 53. Re2 Kh6 54. Ra2 Kg7 55. Kg2 Re1 56. Ra7+ Kg8 57. Re7 Ra1 58. Kf2 Ra3 59. Rb7 h4 60. gxh4 Rh3 61. Rb8+ Kg7 62. Rb7+ Kg8 63. Ke2 Rxh4 64. Kd3 Rh1 65. Kc4 Rd1 66. Rb3 Kf7 67. Rd3 Rc1+ 68. Kd4 Ra1 69. Kc5 Ke7 70. Rg3 Rc1+ 71. Kd4 Rd1+ 72. Ke3 Kf7 73. Rh3 Kg7 74. Rh2 Ra1 75. Rc2 Ra4 76. Rc7+ Kf8 77. Rb7 Ke8 78. Kf4 Kf8 79. Kg4 Rxe4+ 80. Kh5 Ra4 81. Kg6 Rg4+ 82. Kxf6 Kg8 83. Rb8+ Kh7 84. Re8 Ra4 85. Kf7 Kh6 86. f6 Ra7+ 87. Re7 Ra8 88. Rb7 Ra1 89. Rd7 Ra8 90. Rd1 Ra7+ 91. Ke6 Ra6+ 92. Rd6 Ra1 93. Rd2 Ra6+ 94. Ke7 Ra7+ 95. Rd7 Ra1 96. f7 Re1+ 97. Kf8 Ra1 98. Kg8 Rg1+ 99. Kh8 Rf1 100. Rd6+ Kh5 101. Kg7 Rg1+ 102. Kh7 Rf1 103. Rd5+ Kh4 104. Kg6 Kg4 105. Kg7 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "2"]
[White "Willemze, Jeroen"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B70"]
[PlyCount "121"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Bc4 Bg7 7. h3 0-0 8. 0-0 Nxe4 9. Bxf7+ Kxf7 10. Nxe4 h6 11. c4 Nc6 12. Ne2 Be6 13. Qc2 Rc8 14. Nf4 Ne5 15. Nxe6 Kxe6 16. b3 Kf7 17. Bb2 Kg8 18. f4 Nd7 19. Bxg7 Kxg7 20. Rae1 Qb6+ 21. Kh1 Rf7 22. f5 Rcf8 23. Ng3 Ne5 24. Qe4 Qc6 25. Qb1 Qb6 26. fxg6 Rxf1+ 27. Rxf1 Rxf1+ 28. Qxf1 Nxg6 29. Nh5+ Kg8 30. Qf5 Nf8 31. Qg4+ Kf7 32. Qf4+ Kg8 33. Qxh6 Qd4 34. Qg5+ Kf7 35. Qf5+ Ke8 36. Kh2 Nd7 37. Ng3 b6 38. Qg5 Nf6 39. Qg6+ Kd8 40. Qf7 Qf4 41. Qf8+ Kd7 42. Qa8 a5 43. Qb7+ Ke6 44. Qc8+ Ke5 45. Qb7 e6 46. Qxb6 Ne4 47. Qxa5+ Kf6 48. Qe1 d5 49. cxd5 exd5 50. a4 Kg5 51. a5 Kh4 52. Qe3 Qd6 53. Qf3 Kg5 54. Qh5+ Kf4 55. Qf3+ Kg5 56. a6 Qxa6 57. Nxe4+ dxe4 58. Qxe4 Qd6+ 59. g3 Qd2+ 60. Qg2 Qd3 61. Qb2 1-0

[Event "Hengelo U20 op"]
[Site "Hengelo"]
[Date "1996.??.??"]
[Round "8"]
[White "Zult, Daan"]
[Black "Keessen, Aldert Jan"]
[Result "0-1"]
[ECO "A36"]
[PlyCount "74"]
[EventDate "1996.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 c5 3. e4 Nc6 4. g3 g6 5. Bg2 Bg7 6. Nge2 0-0 7. 0-0 Ne8 8. d3 Nc7 9. Rb1 Rb8 10. Be3 Ne6 11. a3 d6 12. b4 Ned4 13. h3 b6 14. Kh2 Bb7 15. f4 e6 16. Bg1 Qd7 17. b5 Nxe2 18. Nxe2 Nd4 19. Nxd4 cxd4 20. f5 Qe7 21. Qd2 Be5 22. Qf2 Kg7 23. Kh1 Qg5 24. Bh2 Rbe8 25. h4 Qe7 26. g4 f6 27. Bg1 gxf5 28. exf5 Bxg2+ 29. Qxg2 Kh8 30. Rbe1 Rg8 31. h5 Rg5 32. Bh2 Reg8 33. Bxe5 dxe5 34. Qc6 Rxg4 35. Re2 Qg7 36. Qf3 Rg3 37. Qf2 Rh3+ 0-1

[Event "NED-ch U16"]
[Site "Hengelo"]
[Date "1995.??.??"]
[Round "4"]
[White "Dambacher, Martijn"]
[Black "Keessen, Aldert Jan"]
[Result "1-0"]
[ECO "B76"]
[PlyCount "81"]
[EventDate "1995.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. Nc3 c5 2. Nf3 Nf6 3. e4 d6 4. d4 cxd4 5. Nxd4 g6 6. Be3 Bg7 7. f3 0-0 8. Qd2 Nc6 9. 0-0-0 d5 10. Qe1 e5 11. Nxc6 bxc6 12. exd5 cxd5 13. Bg5 Bb7 14. Qxe5 Qb6 15. Be3 Qa5 16. Bd4 Rfc8 17. a3 Rc6 18. Qe3 Rac8 19. Bd3 Ne8 20. Ne2 Ba6 21. Bxg7 Nxg7 22. Nd4 Qb6 23. Rhe1 Re8 24. Qxe8+ Nxe8 25. Rxe8+ Kg7 26. Bxa6 Rc7 27. Be2 Rb7 28. b3 Qc5 29. Kb2 a5 30. f4 a4 31. b4 Qc7 32. g3 Qd7 33. Re5 Qh3 34. Rxd5 Qxh2 35. Bf3 Rc7 36. b5 Qf2 37. b6 Rxc2+ 38. Nxc2 Qxb6+ 39. Kc1 Qf2 40. R1d3 Qg1+ 41. Bd1 1-0

[Event "NED-ch U16"]
[Site "Hengelo"]
[Date "1995.??.??"]
[Round "6"]
[White "Keessen, Aldert Jan"]
[Black "Bardelmeijer, Niels"]
[Result "1/2-1/2"]
[ECO "A87"]
[PlyCount "86"]
[EventDate "1995.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 g6 2. c4 f5 3. g3 Nf6 4. Bg2 Bg7 5. Nc3 d6 6. Nf3 0-0 7. d5 Nbd7 8. Nd4 Ne5 9. b3 Kh8 10. Bb2 Bd7 11. 0-0 c5 12. dxc6 Nxc6 13. Nxc6 Bxc6 14. Nd5 e6 15. Nxf6 Bxf6 16. Bxf6+ Rxf6 17. Qd3 Qc7 18. Rad1 Bxg2 19. Kxg2 Qc6+ 20. Kg1 e5 21. Qd5 Kg7 22. Rd2 Kf8 23. Rfd1 Ke7 24. c5 Qxd5 25. Rxd5 Rd8 26. cxd6+ Rfxd6 27. Rxe5+ Kf6 28. Rxd6+ Rxd6 29. Rc5 Rd2 30. Rc7 Rxe2 31. Rxb7 Rxa2 32. Rxh7 a5 33. h4 Rb2 34. Ra7 Rxb3 35. Rxa5 Rb6 36. Kg2 Rc6 37. Ra4 Rb6 38. Kf3 g5 39. h5 Rb3+ 40. Kg2 g4 41. Ra1 Kg5 42. Rh1 Rb6 43. f4+ Kh6 1/2-1/2

[Event "NED-ch U16"]
[Site "Hengelo"]
[Date "1995.??.??"]
[Round "9"]
[White "Keessen, Aldert Jan"]
[Black "Ketelaars, Tom"]
[Result "1-0"]
[ECO "E98"]
[PlyCount "65"]
[EventDate "1995.??.??"]
[EventType "swiss"]
[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 d6 5. Be2 0-0 6. Nf3 e5 7. 0-0 Nc6 8. d5 Ne7 9. Ne1 Ne8 10. f4 f5 11. fxe5 Bxe5 12. Bh6 Bg7 13. Bxg7 Nxg7 14. Nf3 fxe4 15. Nxe4 Nef5 16. Qd2 Qe7 17. Bd3 Qd7 18. Rae1 a6 19. Qc3 Qd8 20. Nd4 Nxd4 21. Rxf8+ Qxf8 22. Qxd4 Ne8 23. Ng5 Bd7 24. Rf1 Qg7 25. Qf4 Bf5 26. Ne6 Bxe6 27. dxe6 b6 28. Be4 Rb8 29. Bd5 h6 30. e7+ Kh7 31. Qf8 Qd4+ 32. Kh1 g5 33. Qg8# 1-0

[Event "NED-ch U16"]
[Site "Hengelo"]
[Date "1995.??.??"]
[Round "1"]
[White "Keessen, Aldert Jan"]
[Black "Kordel, Mathias"]
[Result "0-1"]
[ECO "D36"]
[PlyCount "58"]
[EventDate "1995.??.??"]
[EventType "swiss"]
[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 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 c6 6. Qc2 Bd6 7. e3 0-0 8. Bd3 h6 9. Bh4 Qe7 10. Nge2 Re8 11. 0-0-0 Bg4 12. h3 Bxe2 13. Nxe2 Na6 14. Bxa6 bxa6 15. g4 Rab8 16. Rd3 c5 17. dxc5 Bxc5 18. Nc3 Ba3 19. Bxf6 Bxb2+ 20. Qxb2 Qxf6 21. Qd2 Rec8 22. Kd1 Qf3+ 23. Ke1 Qxh1+ 24. Ke2 Qxh3 25. Rd4 Rc4 26. Nxd5 Rxd4 27. Qxd4 Qh4 28. Qe5 Qxg4+ 29. Kd2 Rd8 0-1

[Event "NED-ch U16"]
[Site "Hengelo"]
[Date "1995.??.??"]
[Round "5"]
[White "Keessen, Aldert Jan"]
[Black "Van Rossum, Marloes"]
[Result "1-0"]
[ECO "D35"]
[PlyCount "39"]
[EventDate "1995.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 c5 7. Rb1 b6 8. Bd3 Bb7 9. Nf3 Be7 10. 0-0 0-0 11. Be3 Nd7 12. Nd2 Ne5 13. Be2 cxd4 14. cxd4 Nc6 15. Nc4 Qd7 16. d5 exd5 17. exd5 Rfd8 18. Bf3 Nb4 19. d6 Bxd6 20. Qxd6 1-0

[Event "NED-ch U16"]
[Site "Hengelo"]
[Date "1995.??.??"]
[Round "3"]
[White "Keessen, Aldert Jan"]
[Black "Winter, R."]
[Result "1-0"]
[ECO "A50"]
[PlyCount "47"]
[EventDate "1995.??.??"]
[EventType "swiss"]
[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 e6 3. Nc3 b6 4. e4 d6 5. f4 Bb7 6. d5 Nbd7 7. Nf3 Nc5 8. Qc2 Be7 9. b4 Ncd7 10. Bb2 c5 11. b5 a6 12. Bd3 h6 13. a4 Rg8 14. bxa6 Bxa6 15. Nb5 g5 16. e5 dxe5 17. fxe5 Bxb5 18. exf6 Bxf6 19. cxb5 exd5 20. 0-0 g4 21. Rae1+ Kf8 22. Bxf6 Nxf6 23. Ne5 Rg7 24. Rxf6 1-0

