[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.19"]
[Round "9"]
[White "Willemsen, Jos"]
[Black "Span, Paul"]
[Result "0-1"]
[ECO "B05"]
[WhiteElo "2263"]
[BlackElo "2295"]
[PlyCount "106"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 c6 6. 0-0 Bxf3 7. Bxf3 dxe5 8. dxe5 e6 9. Qe2 Nd7 10. c4 Ne7 11. Bg4 Qc7 12. f4 h5 13. Bh3 g6 14. Be3 Nf5 15. Bxf5 gxf5 16. Nc3 0-0-0 17. Rad1 h4 18. Kh1 h3 19. g3 Be7 20. Na4 c5 21. Qf3 Nb8 22. b4 Na6 23. b5 Nb4 24. Qe2 b6 25. a3 Nc6 26. Rxd8+ Rxd8 27. Kg1 Na5 28. Nb2 Qb7 29. Qf3 Bf8 30. Qxb7+ Kxb7 31. Kf2 Bg7 32. Ke2 f6 33. Bd2 Nb3 34. Bc3 fxe5 35. fxe5 Nd4+ 36. Bxd4 Rxd4 37. Nd3 Rxc4 38. Kd2 Bh6+ 39. Kd1 Rd4 40. Kc2 c4 41. Nf4 Re4 42. Nxe6 Rxe5 43. Nd4 f4 44. gxf4 Re4 45. Nc6 Rxf4 46. Rg1 Rf2+ 47. Kc3 Rxh2 48. Rg6 Bf4 49. Rg7+ Bc7 50. Rh7 Ra2 51. Kxc4 h2 52. Nd8+ Kc8 53. Ne6 Bg3 0-1

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.18"]
[Round "8"]
[White "Van Geffen, Ben"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "B35"]
[WhiteElo "2129"]
[BlackElo "2263"]
[PlyCount "43"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 Qa5 8. 0-0 0-0 9. Bb3 d6 10. h3 Re8 11. f4 Nxd4 12. Bxd4 e5 13. Be3 exf4 14. Rxf4 Be6 15. Qf1 Bh6 16. Rf3 Bxe3+ 17. Rxe3 Qc5 18. Qf2 Bxb3 19. axb3 Re6 20. Ree1 Qxf2+ 21. Kxf2 a6 22. Rad1 1/2-1/2

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.17"]
[Round "7"]
[White "Willemsen, Jos"]
[Black "Galje, Hans"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "2263"]
[BlackElo "2125"]
[PlyCount "40"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 c6 5. Nf3 Nf6 6. Bc4 Bf5 7. 0-0 e6 8. Qe2 Nbd7 9. Bb3 Bd6 10. Re1 0-0 11. Ne5 Qc7 12. h3 Nb6 13. Bg5 Nfd7 14. Nxd7 Nxd7 15. Ne4 Bf4 16. Be7 Rfe8 17. Ba3 Bxe4 18. Qxe4 Nf6 19. Qf3 Rad8 20. Rad1 Bd6 1/2-1/2

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.16"]
[Round "6"]
[White "Dogge, Marc"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "B38"]
[WhiteElo "2124"]
[BlackElo "2263"]
[PlyCount "49"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 0-0 8. Be2 d6 9. 0-0 Bd7 10. Nc2 a5 11. Rb1 Nb4 12. Nd4 Na6 13. Ndb5 Bc6 14. f3 Nd7 15. Qd2 Nac5 16. Kh1 a4 17. b4 axb3 18. axb3 b6 19. Qb2 Na6 20. b4 Re8 21. Qd2 Bb7 22. Nd5 Qb8 23. Rfc1 Bf8 24. Bd3 Bc8 25. Qf2 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.15"]
[Round "5"]
[White "Sawadkuhi, Massoud Amir"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "D01"]
[WhiteElo "2263"]
[BlackElo "2263"]
[PlyCount "116"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 d5 3. Bg5 h6 4. Bh4 g6 5. e3 Bg7 6. Nf3 b6 7. a4 a5 8. Ne5 Bb7 9. Bb5+ c6 10. Be2 0-0 11. 0-0 Ba6 12. Bxa6 Rxa6 13. Qd3 Ra7 14. f3 Qc8 15. e4 e6 16. g4 g5 17. Bg3 Na6 18. Kg2 Nb4 19. Qd2 Rd8 20. h4 Nh7 21. exd5 exd5 22. Nd1 c5 23. c3 Nc6 24. Ne3 Nxe5 25. Bxe5 f6 26. Bg3 Bf8 27. Nf5 h5 28. Rae1 hxg4 29. fxg4 Qc6 30. b3 c4 31. bxc4 dxc4+ 32. Rf3 Qxa4 33. Re6 Re8 34. Qe2 Rxe6 35. Qxe6+ Rf7 36. Ne3 Qd7 37. Qxc4 Kh8 38. Nf5 b5 39. Qa2 a4 40. h5 b4 41. cxb4 Bxb4 42. d5 Rf8 43. Bf2 Bd6 44. Rc3 Be5 45. Rc6 Rb8 46. Ra6 Rb3 47. Ra8+ Bb8 48. Ne3 Rb4 49. Bg3 Qc8 50. Rxb8 Rxb8 51. Bxb8 Qxb8 52. Qxa4 Nf8 53. Qe4 Qd6 54. Nc4 Qa6 55. h6 Qa2+ 56. Kf1 Ng6 57. Qxg6 Qxc4+ 58. Ke1 Qb4+ 1/2-1/2

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.14"]
[Round "4"]
[White "Willemsen, Jos"]
[Black "Van der Stricht, Geert"]
[Result "1/2-1/2"]
[ECO "B50"]
[WhiteElo "2263"]
[BlackElo "2403"]
[PlyCount "89"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 c5 2. b3 d6 3. Bb2 Nf6 4. Nc3 Nc6 5. Nf3 e6 6. d4 cxd4 7. Nxd4 Qa5 8. Bb5 Bd7 9. 0-0 Be7 10. Re1 0-0 11. Bf1 Rfd8 12. a3 a6 13. Qd2 Rac8 14. Rad1 Nxd4 15. Qxd4 Bf8 16. h3 b5 17. Qe3 Bc6 18. Qg3 Kh8 19. Bd3 Bb7 20. Nb1 e5 21. Nd2 Nh5 22. Qf3 Nf4 23. Nf1 Nxd3 24. cxd3 Rc2 25. Bc1 Qc7 26. Ne3 Rc3 27. b4 Qd7 28. Bb2 Rcc8 29. Rc1 Qe6 30. Nd5 f5 31. Nb6 fxe4 32. dxe4 Rb8 33. Nd5 Rd7 34. Rc2 Rf7 35. Qd3 g6 36. Bc1 Rc8 37. Rxc8 Qxc8 38. Bg5 Qe6 39. Rc1 h6 40. Be3 Kh7 41. f3 h5 42. Bg5 Bh6 43. Bxh6 Kxh6 44. Qd2+ Kg7 45. Rc3 1/2-1/2

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.13"]
[Round "3"]
[White "Willemsen, Jos"]
[Black "Meis, Eric"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2263"]
[BlackElo "2113"]
[PlyCount "79"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 c6 4. f4 Qa5 5. Bd2 Qb6 6. e5 Nd5 7. Nxd5 cxd5 8. Bc3 Nc6 9. Nf3 Bg4 10. Be2 e6 11. a3 0-0-0 12. Qd2 Rd7 13. Rf1 h6 14. h3 Bxf3 15. Rxf3 g6 16. b4 a6 17. Rb1 Be7 18. b5 dxe5 19. fxe5 axb5 20. Rxb5 Qa7 21. Bb2 Bg5 22. Qd1 f6 23. exf6 Rf8 24. Rc5 Rxf6 25. Bb5 Rdf7 26. Bxc6 bxc6 27. Rxc6+ Kd7 28. Rcc3 Qa5 29. Kf2 Qa7 30. Kg1 e5 31. Rxf6 Rxf6 32. Rc5 Qa6 33. Rxd5+ Kc7 34. Rxe5 Bh4 35. c4 Bg3 36. Rc5+ Kd8 37. Rd5+ Kc7 38. Qg4 Rf1+ 39. Kxf1 Qxc4+ 40. Kg1 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.12"]
[Round "2"]
[White "Timmermans, Ivo"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "B35"]
[WhiteElo "2180"]
[BlackElo "2263"]
[PlyCount "39"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 Qa5 8. 0-0 0-0 9. Nb3 Qd8 10. f4 d6 11. Be2 a6 12. Bf3 Rb8 13. Qe2 Nd7 14. Rad1 Na5 15. Ba7 Nxb3 16. axb3 Ra8 17. Bd4 Bxd4+ 18. Rxd4 Qb6 19. Qf2 e5 20. fxe5 1/2-1/2

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2002.10.11"]
[Round "1"]
[White "Willemsen, Jos"]
[Black "Dvoirys, Semen I"]
[Result "0-1"]
[ECO "B26"]
[WhiteElo "2263"]
[BlackElo "2567"]
[PlyCount "68"]
[EventDate "2002.10.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 090 Extra"]
[Source "ChessBase"]
[SourceDate "2002.11.07"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.07"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Be3 Qa5 7. Qd2 Bd7 8. Nge2 Nd4 9. h3 e6 10. 0-0 Ne7 11. Nc1 0-0 12. Nb3 Qc7 13. Nd1 f5 14. c3 Ndc6 15. f4 b6 16. Nf2 a5 17. a3 a4 18. Nc1 Rad8 19. Ne2 Na5 20. Rad1 fxe4 21. dxe4 Nc4 22. Qc1 e5 23. Kh2 Bb5 24. Nd3 d5 25. exd5 Nxd5 26. Bg1 Bc6 27. fxe5 Rxf1 28. Rxf1 Nde3 29. Bxe3 Bxg2 30. Kxg2 Rxd3 31. Bf4 Qc6+ 32. Kg1 Qe4 33. Rf2 g5 34. Bxg5 Nxe5 0-1

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.08.03"]
[Round "9"]
[White "Muhren, Willem"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "C00"]
[WhiteElo "2182"]
[BlackElo "2280"]
[PlyCount "128"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 c5 2. d3 e6 3. g3 d5 4. Nd2 Nc6 5. Bg2 Nf6 6. Ngf3 dxe4 7. dxe4 Be7 8. 0-0 0-0 9. c3 Qc7 10. Qe2 b6 11. b3 a5 12. a4 Ba6 13. Nc4 e5 14. Rd1 Rfd8 15. Bb2 Rxd1+ 16. Rxd1 Rd8 17. Rxd8+ Bxd8 18. Bh3 Be7 19. Qd3 h6 20. Ne1 b5 21. axb5 Bxb5 22. Nc2 Qb8 23. N2a3 Ba6 24. Qc2 Qd8 25. Bf1 Qb8 26. f3 Bc8 27. Ne3 Be6 28. Bc4 Bxc4 29. Naxc4 Ne8 30. Nd5 Bd8 31. Ba3 Qb5 32. Qf2 a4 33. Nb2 axb3 34. Qxc5 Qxc5+ 35. Bxc5 Nc7 36. Kf2 f6 37. Ke2 Kf7 38. Kd3 Ne6 39. Be3 Na5 40. h3 Be7 41. Nxe7 Kxe7 42. Bb6 Nb7 43. h4 h5 44. Kc4 g5 45. Be3 g4 46. fxg4 hxg4 47. Nd3 Nd6+ 48. Kd5 Nc7+ 49. Kc6 Nxe4 50. Kxc7 Nxc3 51. Kc6 Ne4 52. Bc1 Nxg3 53. Ba3+ Kf7 54. Nc1 Nf5 55. Kd5 Nd4 56. Ke4 g3 57. Ke3 f5 58. Ne2 f4+ 59. Kd3 Nxe2 60. Kxe2 e4 61. h5 f3+ 62. Ke3 g2 63. Kf2 e3+ 64. Kg1 e2 0-1

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.08.02"]
[Round "8"]
[White "Willemsen, Jos"]
[Black "Boersma, Jan"]
[Result "0-1"]
[ECO "C14"]
[WhiteElo "2280"]
[BlackElo "2230"]
[PlyCount "72"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 a6 8. Nf3 c5 9. Qd2 Nc6 10. 0-0-0 b5 11. dxc5 Nxc5 12. Nd4 Bb7 13. Nxc6 Bxc6 14. Qd4 b4 15. Ne2 0-0 16. Qe3 a5 17. Nd4 Bd7 18. g4 a4 19. Kb1 a3 20. b3 Ne4 21. Re1 f6 22. Bg2 fxe5 23. fxe5 Nc3+ 24. Ka1 Rac8 25. Rhf1 Nb5 26. Rxf8+ Qxf8 27. Nxb5 Bxb5 28. Kb1 Be8 29. Bf1 Bg6 30. Bd3 Bxd3 31. Qxd3 Qf2 32. Rc1 Rf8 33. Qa6 Qd4 34. Qxe6+ Kh8 35. c3 Qd3+ 36. Ka1 Qd2 0-1

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.08.01"]
[Round "7"]
[White "Van der Werf, Mark"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "A65"]
[WhiteElo "2422"]
[BlackElo "2280"]
[PlyCount "53"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 g6 4. Nc3 Bg7 5. e4 d6 6. Bd3 0-0 7. h3 e6 8. Bg5 h6 9. Be3 exd5 10. cxd5 Re8 11. Nf3 c4 12. Bc2 b5 13. a3 a6 14. 0-0 Nbd7 15. Qd2 Kh7 16. Rfe1 Qc7 17. Rad1 Bb7 18. Nh2 Nc5 19. Bd4 Nb3 20. Bxb3 cxb3 21. Rc1 Qd7 22. Re3 a5 23. Rf3 Ng8 24. Bxg7 Kxg7 25. Qd4+ f6 26. Ng4 Rf8 27. Nxb5 1-0

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.07.30"]
[Round "5"]
[White "Willemsen, Jos"]
[Black "De Saegher, Chris"]
[Result "1/2-1/2"]
[ECO "B16"]
[WhiteElo "2280"]
[BlackElo "2217"]
[PlyCount "35"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ gxf6 6. Nf3 Bg4 7. Be2 Qc7 8. h3 Bf5 9. 0-0 Rg8 10. Kh1 e6 11. Bd3 Bg6 12. Nh4 Nd7 13. Nxg6 hxg6 14. c3 0-0-0 15. Qe2 g5 16. f4 gxf4 17. Bxf4 Bd6 18. Bxd6 1/2-1/2

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.07.29"]
[Round "4"]
[White "Nicolai, Erik"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "E60"]
[WhiteElo "2238"]
[BlackElo "2280"]
[PlyCount "95"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 Nc6 3. g3 g6 4. Bg2 d6 5. 0-0 Bg7 6. Nc3 Nf6 7. d4 cxd4 8. Nxd4 Bd7 9. b3 0-0 10. Bb2 Nxd4 11. Qxd4 Bc6 12. Nd5 Nh5 13. Qd2 e6 14. Bxg7 Nxg7 15. Nc3 Bxg2 16. Kxg2 Qa5 17. Rfd1 Rfd8 18. Ne4 Qe5 19. Qd4 Nf5 20. Qxe5 dxe5 21. e3 Ne7 22. Kf1 Nc6 23. Ke2 Kf8 24. Rxd8+ Rxd8 25. Rd1 Rxd1 26. Kxd1 Ke7 27. Kd2 f5 28. Nc5 b6 29. Nd3 e4 30. Ne1 Ne5 31. h3 Kd6 32. Kc3 g5 33. b4 g4 34. h4 Nf3 35. Nc2 e5 36. a3 a6 37. a4 Kc6 38. b5+ axb5 39. axb5+ Kc5 40. Nb4 Ne1 41. Na6+ Kd6 42. c5+ bxc5 43. Kc4 Nd3 44. b6 Kc6 45. b7 Kxb7 46. Nxc5+ Kc6 47. Nxd3 exd3 48. Kxd3 1/2-1/2

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.07.28"]
[Round "3"]
[White "Willemsen, Jos"]
[Black "L'Ami, Erwin"]
[Result "0-1"]
[ECO "B22"]
[WhiteElo "2280"]
[BlackElo "2438"]
[PlyCount "86"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 cxd4 5. Nf3 Nc6 6. Bc4 Nb6 7. Bb3 d5 8. exd6 Qxd6 9. cxd4 Be6 10. 0-0 Bxb3 11. Qxb3 e6 12. Nc3 Be7 13. Rd1 Rd8 14. a3 0-0 15. g3 Bf6 16. Be3 Nd5 17. Ne4 Qe7 18. Nxf6+ Nxf6 19. Rac1 Nd5 20. Bg5 f6 21. Bd2 Rd6 22. Re1 Qd7 23. Re4 Re8 24. Rce1 a6 25. Bc3 Nce7 26. Nh4 Rc6 27. f4 g6 28. Nf3 Kh8 29. Bd2 Nf5 30. R4e2 Nd6 31. Qd3 Nc4 32. Bc1 b5 33. Kh1 a5 34. g4 Ra8 35. g5 f5 36. Rc2 a4 37. Kg1 Qd6 38. Ne5 Nxe5 39. Rxe5 Rxc2 40. Qxc2 Qb6 41. Qd3 Rc8 42. Bd2 Rc4 43. Bc3 Qc6 0-1

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.07.27"]
[Round "2"]
[White "Bertrem, Stijn"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "A68"]
[BlackElo "2280"]
[PlyCount "85"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 g6 4. Nc3 Bg7 5. e4 d6 6. f4 0-0 7. Nf3 e6 8. Be2 exd5 9. cxd5 Bg4 10. 0-0 Bxf3 11. Bxf3 Nbd7 12. Be3 Ne8 13. Qc2 a6 14. a4 Qa5 15. h4 h5 16. e5 dxe5 17. f5 Nd6 18. fxg6 f5 19. Bxh5 b5 20. axb5 Qb6 21. b4 axb5 22. bxc5 Nxc5 23. Rxa8 Rxa8 24. Nxb5 Qxb5 25. Qxc5 Qxc5 26. Bxc5 Ne4 27. Be7 Ng3 28. Bd1 Nxf1 29. Kxf1 Bf8 30. Bg5 Bc5 31. h5 Kg7 32. Bb3 Ra1+ 33. Ke2 Ra3 34. g4 f4 35. Bc2 f3+ 36. Kd2 Bb4+ 37. Kc1 f2 38. h6+ Kf8 39. g7+ Kg8 40. h7+ Kxg7 41. Bf6+ Kf7 42. h8Q f1Q+ 43. Bd1 0-1

[Event "Lost Boys op"]
[Site "Amsterdam"]
[Date "2002.07.26"]
[Round "1"]
[White "Willemsen, Jos"]
[Black "De Vreugt, Dennis"]
[Result "0-1"]
[ECO "B22"]
[WhiteElo "2280"]
[BlackElo "2477"]
[PlyCount "92"]
[EventDate "2002.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 cxd4 5. Nf3 e6 6. Qxd4 Nc6 7. Qe4 f5 8. Qe2 Qc7 9. g3 d6 10. exd6 Bxd6 11. Bg2 Nf6 12. 0-0 0-0 13. Nd4 Nxd4 14. cxd4 Bd7 15. Nc3 Qb6 16. Rd1 Rae8 17. a4 a6 18. Qd3 h6 19. a5 Qb3 20. Ne4 Qxd3 21. Nxf6+ Rxf6 22. Rxd3 Rf7 23. Rb3 Bb5 24. Bf1 Bc6 25. Bg2 Bxg2 26. Kxg2 Rc8 27. Be3 Rd7 28. Rc1 Rxc1 29. Bxc1 Kf7 30. Bd2 g5 31. h3 Be7 32. Bc3 Bd8 33. Kf3 Ke7 34. Ke2 h5 35. f3 Kd6 36. Kd3 Kd5 37. Be1 g4 38. hxg4 hxg4 39. fxg4 fxg4 40. Rc3 Rc7 41. Bd2 Rc6 42. Rb3 b5 43. axb6 Rxb6 44. Rxb6 Bxb6 45. Be3 Ba7 46. b3 Bb6 0-1

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.07"]
[Round "5"]
[White "Doggers, Peter"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "A38"]
[WhiteElo "2176"]
[BlackElo "2002"]
[PlyCount "78"]
[EventDate "2002.07.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 d6 6. 0-0 Nf6 7. d4 cxd4 8. Nxd4 Bd7 9. Nc2 0-0 10. b3 Qc8 11. Re1 Bh3 12. e4 Bxg2 13. Kxg2 Ne8 14. Qd3 f5 15. exf5 Rxf5 16. Bd2 Ne5 17. Qe2 Nf3 18. Ne3 Nxe1+ 19. Rxe1 Rf7 20. Ned5 Bf8 21. Ne4 h6 22. Nf4 Kh7 23. h4 e5 24. Nd5 Qf5 25. g4 Qe6 26. Rh1 Nc7 27. Nxc7 Rxc7 28. h5 g5 29. f3 Be7 30. Qd3 Kh8 31. Re1 b5 32. cxb5 d5 33. Ng3 Rac8 34. Kh3 Bf8 35. Re2 Rc2 36. a4 Bg7 37. Nf5 e4 38. fxe4 dxe4 39. Qe3 R2c3 0-1

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.07"]
[Round "6"]
[White "Willemsen, Jos"]
[Black "Plukkel, Sjoerd"]
[Result "0-1"]
[ECO "B22"]
[WhiteElo "2002"]
[BlackElo "2045"]
[PlyCount "50"]
[EventDate "2002.07.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 Bg4 6. Be2 e6 7. h3 Bh5 8. 0-0 Nf6 9. Be3 cxd4 10. cxd4 Be7 11. Nc3 Qa5 12. a3 a6 13. b4 Qd8 14. Qb3 0-0 15. Rfd1 Nd5 16. Rac1 Rc8 17. Na4 Nxe3 18. fxe3 Bd6 19. Nc5 Qe7 20. Qa4 e5 21. Ne4 exd4 22. Nxd6 Qxe3+ 23. Kf1 d3 24. Bxd3 Bxf3 25. Qb3 Be2+ 0-1

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.06"]
[Round "4"]
[White "Willemsen, Jos"]
[Black "Janse, Paul"]
[Result "1-0"]
[ECO "B22"]
[WhiteElo "2002"]
[BlackElo "2178"]
[PlyCount "100"]
[EventDate "2002.07.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 cxd4 5. Nf3 e6 6. cxd4 d6 7. Nc3 Nxc3 8. bxc3 Qc7 9. Bd2 Bd7 10. exd6 Bxd6 11. Bd3 Bc6 12. 0-0 Nd7 13. c4 Nf6 14. Re1 0-0-0 15. Bc3 Bxf3 16. Qxf3 Bxh2+ 17. Kh1 Qf4 18. Qh3 Ng4 19. Re2 f5 20. Rb1 Rhf8 21. Qf3 Rd7 22. Qxf4 Bxf4 23. f3 Ne5 24. Bc2 Nxc4 25. Bb3 Rc7 26. Rbe1 Rf6 27. Rxe6 Rxe6 28. Rxe6 Nb6 29. Bb2 Bc1 30. Bxc1 Rxc1+ 31. Kh2 Kd7 32. Re2 g6 33. Bg8 Rd1 34. Bxh7 Rxd4 35. Bxg6 f4 36. Kh3 Nd5 37. Rb2 b6 38. Kh4 Kd6 39. Kg5 Ke5 40. Re2+ Ne3 41. g3 Rd1 42. gxf4+ Kd4 43. Be4 Rg1+ 44. Kh6 Rg3 45. Rd2+ Kc5 46. Rd3 Ng2 47. f5 Rh3+ 48. Kg7 Nf4 49. Rd2 Rg3+ 50. Kf7 b5 1-0

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.06"]
[Round "2"]
[White "Willemsen, Jos"]
[Black "Zult, Daan"]
[Result "0-1"]
[ECO "B25"]
[WhiteElo "2002"]
[BlackElo "2208"]
[PlyCount "62"]
[EventDate "2002.07.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. e4 c5 2. g3 g6 3. Bg2 Bg7 4. f4 Nc6 5. Nc3 e6 6. d3 Nge7 7. Nf3 d6 8. 0-0 0-0 9. Be3 Nd4 10. Qd2 Rb8 11. Nd1 b5 12. c3 Nxf3+ 13. Bxf3 b4 14. d4 bxc3 15. bxc3 Ba6 16. Re1 cxd4 17. cxd4 d5 18. Nc3 dxe4 19. Bxe4 Nf5 20. Bxf5 exf5 21. Rec1 Qa5 22. Rab1 Rbd8 23. Rc2 Rfe8 24. Bf2 Rd7 25. Nb5 Qd8 26. Rc4 Rde7 27. a4 Re2 28. Qc3 Qd5 29. Rc5 Qe4 30. Qb3 Bxb5 31. Qxb5 Rxf2 0-1

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.06"]
[Round "3"]
[White "Witkamp, Jarno"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "A00"]
[WhiteElo "1664"]
[BlackElo "2002"]
[PlyCount "96"]
[EventDate "2002.07.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. g3 d5 2. d3 e5 3. Nd2 Nf6 4. c4 c6 5. Ngf3 Nbd7 6. a3 a5 7. Bg2 a4 8. 0-0 Bd6 9. Ne1 0-0 10. Nc2 d4 11. Ne4 Nxe4 12. Bxe4 Nc5 13. Bg2 Nb3 14. Rb1 Bg4 15. Bd2 Nxd2 16. Qxd2 Qd7 17. b4 axb3 18. Rxb3 Qe7 19. Rfb1 Bc8 20. Nb4 Bc5 21. Qb2 h6 22. Rf1 f5 23. Nc2 Kh8 24. Ra1 Rd8 25. Nb4 e4 26. Qc2 Bxb4 27. Rxb4 Qxb4 28. axb4 Rxa1+ 29. Bf1 Be6 30. Qb2 Rda8 31. f4 exf3 32. exf3 f4 33. g4 b6 34. Qxd4 Rb1 35. Qe4 Bg8 36. Kf2 Ra2+ 37. Be2 Rbb2 38. Qxf4 Rxe2+ 39. Kg3 Rg2+ 40. Kh3 Rxh2+ 41. Qxh2 Rxh2+ 42. Kxh2 g5 43. Kg3 Kg7 44. Kf2 b5 45. cxb5 cxb5 46. Ke3 Bd5 47. f4 gxf4+ 48. Kxf4 Kf6 0-1

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.05"]
[Round "1"]
[White "Westera, Jeroen"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "A29"]
[WhiteElo "1549"]
[BlackElo "2002"]
[PlyCount "110"]
[EventDate "2002.07.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 089 Extra"]
[Source "ChessBase"]
[SourceDate "2002.09.10"]
[SourceVersion "2"]
[SourceVersionDate "2002.09.10"]
[SourceQuality "1"]

1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nc3 Nb6 6. d3 Be7 7. Nf3 Nc6 8. 0-0 0-0 9. Bd2 f5 10. Rc1 Be6 11. a3 Bf6 12. Na4 Nxa4 13. Qxa4 Bd5 14. e4 fxe4 15. dxe4 Be6 16. Rfd1 Qe7 17. Be3 a6 18. Bc5 Qf7 19. Rc3 Rfd8 20. Rdc1 Rd7 21. Be3 Nd4 22. Bxd4 exd4 23. Rd3 b5 24. Qd1 Bc4 25. Rd2 Bb3 26. Qe1 Re8 27. e5 Bd5 28. Rxd4 Bxf3 29. Rxd7 Qxd7 30. Bxf3 Rxe5 31. Qd1 Qxd1+ 32. Rxd1 Rc5 33. b3 Rc3 34. Bb7 a5 35. Bd5+ Kf8 36. Rb1 Bd4 37. Be4 g6 38. h4 Rxg3+ 39. Kh2 Rg4 40. f3 Be5+ 41. Kh1 Rxh4+ 42. Kg1 Rh5 43. Rd1 Bd6 44. a4 bxa4 45. bxa4 Rc5 46. Rd5 Rxd5 47. Bxd5 Ke7 48. Bc6 Bf4 49. Kg2 Kd6 50. Be4 c5 51. Kf2 c4 52. Ke2 Kc5 53. Kd1 Kb4 54. Bc6 Kb3 55. Bd5 h6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.07.02"]
[Round "7"]
[White "Willemsen, Jos"]
[Black "Van Dorp, Quirinius"]
[Result "1/2-1/2"]
[ECO "C45"]
[WhiteElo "2002"]
[BlackElo "1947"]
[PlyCount "53"]
[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. d4 exd4 4. Nxd4 Bc5 5. Nxc6 Qf6 6. Qe2 dxc6 7. Nc3 Ne7 8. Be3 Bxe3 9. Qxe3 Ng6 10. g3 Bg4 11. f4 0-0 12. h3 Bc8 13. Bg2 a5 14. 0-0 a4 15. a3 Ra5 16. e5 Qe7 17. Qf2 Qc5 18. Qxc5 Rxc5 19. Rf2 Rc4 20. Rd1 b5 21. Bf1 Rc5 22. Rd4 f6 23. exf6 gxf6 24. Rfd2 Ne7 25. Bg2 Nf5 26. Rd8 Nd6 27. Rxf8+ 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.06.25"]
[Round "6"]
[White "Van de Peut, Aart A"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "B25"]
[WhiteElo "1879"]
[BlackElo "2002"]
[PlyCount "70"]
[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. Nc3 Nc6 3. f4 d6 4. Nf3 g6 5. g3 Bg7 6. Bg2 Nf6 7. d3 e5 8. 0-0 exf4 9. Bxf4 0-0 10. Qd2 Ng4 11. Rad1 a6 12. Nd5 Be6 13. c3 Nge5 14. Bh6 Nxf3+ 15. Bxf3 Ne5 16. Bg2 Bxd5 17. exd5 Qa5 18. Bxg7 Kxg7 19. a3 Rae8 20. Rf4 f5 21. h3 Re7 22. Rh4 Nf7 23. Re1 Rxe1+ 24. Qxe1 Qd8 25. Rf4 Re8 26. Qd2 Qe7 27. Kf2 b5 28. b4 Qa7 29. d4 c4 30. g4 fxg4 31. Rxg4 Ne5 32. Rh4 Nd3+ 33. Kg3 Kg8 34. Re4 Rf8 35. Qe3 Qf7 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.06.18"]
[Round "5"]
[White "Willemsen, Jos"]
[Black "Van Rijn, Luuk"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "2002"]
[BlackElo "1844"]
[PlyCount "53"]
[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 e6 2. d4 d5 3. Nc3 Bb4 4. exd5 exd5 5. Qf3 Be6 6. a3 Be7 7. Bd3 Nf6 8. h3 0-0 9. Nge2 c5 10. dxc5 Bxc5 11. Bg5 Nbd7 12. 0-0 h6 13. Bf4 a6 14. Rad1 b5 15. g4 Qe7 16. Rfe1 Rae8 17. Ng3 Qd8 18. Nf5 Bxf5 19. Bxf5 Nb6 20. g5 hxg5 21. Bxg5 Rxe1+ 22. Rxe1 b4 23. axb4 Bxb4 24. Qg3 Qd6 25. Qh4 Nbd7 26. Bxd7 Qxd7 27. Qxb4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.06.11"]
[Round "4"]
[White "Smeets, Jan"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "B34"]
[WhiteElo "2338"]
[BlackElo "2002"]
[PlyCount "35"]
[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 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Be2 0-0 8. 0-0 d5 9. exd5 Nb4 10. d6 exd6 11. Ndb5 Bf5 12. Nxd6 Bxc2 13. Qd2 Bf5 14. Bc5 Na6 15. Ba3 Re8 16. Rad1 Re5 17. Qf4 Nd7 18. Bc4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2002.05.21"]
[Round "1"]
[White "Willemsen, Jos"]
[Black "Van Blitterswijk, Stefan"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "2002"]
[BlackElo "2381"]
[PlyCount "92"]
[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. f4 d5 2. e3 Nf6 3. Nf3 Bf5 4. b3 e6 5. Bb2 Nbd7 6. Be2 Bd6 7. 0-0 c6 8. Ne5 0-0 9. Bf3 Qc7 10. Nxd7 Nxd7 11. Kh1 Rae8 12. d3 Bg6 13. Nc3 b5 14. a3 a5 15. g3 e5 16. f5 Bxf5 17. Bxd5 Bh3 18. Bg2 Bxg2+ 19. Kxg2 f5 20. Ne2 Nf6 21. Qd2 Qa7 22. Rae1 Ng4 23. d4 c5 24. h3 Qa8+ 25. Kg1 Nh6 26. dxe5 Bxe5 27. Bxe5 Rxe5 28. Nc3 b4 29. axb4 cxb4 30. Na4 Re6 31. Qg2 Qd8 32. Rf2 f4 33. Nc5 Rxe3 34. Rxe3 fxe3 35. Rxf8+ Qxf8 36. Ne6 Qd6 37. Qa8+ Kf7 38. Nd8+ Ke7 39. Nc6+ Kf6 40. Qd8+ Qxd8 41. Nxd8 Nf5 42. Kg2 Nd4 43. Nb7 Ke5 44. Nxa5 Ke4 45. Nb7 Nxc2 46. Nc5+ Kd4 0-1

[Event "Haarlem AKN op 04th"]
[Site "Haarlem"]
[Date "1995.??.??"]
[Round "6"]
[White "De Vilder, Hans"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "B76"]
[BlackElo "2280"]
[PlyCount "104"]
[EventDate "1995.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[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 g6 6. Be3 Bg7 7. f3 0-0 8. Qd2 Nc6 9. g4 Nxd4 10. Bxd4 Be6 11. Nd5 Bxd5 12. exd5 e5 13. dxe6 fxe6 14. 0-0-0 d5 15. h4 Nd7 16. Bxg7 Kxg7 17. f4 Qf6 18. Bb5 Nc5 19. Rhf1 a6 20. Be2 Ne4 21. g5 Qe7 22. Qd4+ Kg8 23. Bd3 Rac8 24. h5 gxh5 25. Bxe4 Rc4 26. Qg1 Rxe4 27. g6 Rexf4 28. Rxf4 Rxf4 29. gxh7+ Kxh7 30. Qe3 Rf5 31. Kb1 Qf6 32. a3 Rf2 33. Qb6 Qf7 34. Rh1 Rf1+ 35. Rxf1 Qxf1+ 36. Ka2 Qf7 37. Qd4 Qf5 38. Qb6 h4 39. Qxb7+ Kh6 40. c3 h3 41. Qe7 Kh5 42. Qg7 Kh4 43. Qh6+ Kg4 44. Qd2 Qe4 45. Qd1+ Kf4 46. Qg1 Qc4+ 47. Ka1 Qd3 48. Qf2+ Qf3 49. Qd2+ Kg3 50. Qg5+ Kf2 51. Qd2+ Kg1 52. Qg5+ Kf1 0-1

[Event "Haarlem AKN op 04th"]
[Site "Haarlem"]
[Date "1995.??.??"]
[Round "2"]
[White "Knoppert, Erik"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "B73"]
[WhiteElo "2400"]
[BlackElo "2280"]
[PlyCount "61"]
[EventDate "1995.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Ne2 Nc6 3. Nbc3 g6 4. d4 cxd4 5. Nxd4 Bg7 6. Be3 d6 7. Be2 Nf6 8. 0-0 0-0 9. Kh1 Nxd4 10. Bxd4 Qa5 11. f4 e5 12. Be3 Qb4 13. Qd3 Be6 14. a3 Qa5 15. f5 Bd7 16. fxg6 fxg6 17. Qxd6 Bc6 18. Bc5 Kh8 19. b4 Qd8 20. b5 Nxe4 21. Qxd8 Rfxd8 22. bxc6 Nxc5 23. c7 Rd7 24. Nb5 Rc8 25. Rad1 h5 26. Rxd7 Nxd7 27. Rf7 Nb6 28. Nd6 Ra8 29. Bf3 e4 30. Bxe4 Be5 31. Bxb7 1-0

[Event "Haarlem AKN op 04th"]
[Site "Haarlem"]
[Date "1995.??.??"]
[Round "4"]
[White "Strating, Sybolt"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "A59"]
[WhiteElo "2310"]
[BlackElo "2280"]
[PlyCount "58"]
[EventDate "1995.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[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. d5 b5 4. cxb5 a6 5. f3 g6 6. e4 d6 7. Na3 Bg7 8. bxa6 0-0 9. Ne2 Bxa6 10. Nc3 Bxf1 11. Kxf1 Nbd7 12. Nc4 Nb6 13. Ne3 Nfd7 14. Qe2 Na4 15. Ncd1 e6 16. h4 Nab6 17. Nc3 Nf6 18. g4 exd5 19. Nexd5 Nfxd5 20. exd5 Re8 21. Qb5 Bxc3 22. bxc3 Qf6 23. Kf2 Qxc3 24. Bg5 Nxd5 25. Qb3 Qd4+ 26. Kg3 Re2 27. Rhf1 Qe5+ 28. f4 Re3+ 29. Kf2 Qe4 0-1

[Event "Haarlem AKN op 04th"]
[Site "Haarlem"]
[Date "1995.??.??"]
[Round "5"]
[White "Willemsen, Jos"]
[Black "Barsov, Alexei"]
[Result "1/2-1/2"]
[ECO "C01"]
[WhiteElo "2280"]
[BlackElo "2445"]
[PlyCount "71"]
[EventDate "1995.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Bd3 Bd6 5. Ne2 Nc6 6. c3 Nge7 7. Bf4 Bg4 8. Bxd6 Qxd6 9. Qd2 0-0-0 10. Na3 h5 11. 0-0-0 h4 12. h3 Bh5 13. Nc2 Ng6 14. Rde1 Nce7 15. Ne3 Kb8 16. Nf5 Nxf5 17. Bxf5 Bxe2 18. Bxg6 Bf3 19. gxf3 Qxg6 20. Qf4 f6 21. Re7 Rc8 22. Qg4 Qh6+ 23. Kc2 g6 24. Qe6 Qg5 25. Qg4 Qh6 26. Qe6 Rhd8 27. Re1 f5 28. Rd7 Rxd7 29. Qxd7 a6 30. Re8 Rxe8 31. Qxe8+ Ka7 32. Qe5 c6 33. Qd6 Qg5 34. f4 Qg2 35. Qc5+ Kb8 36. Qf8+ 1/2-1/2

[Event "Haarlem AKN op 04th"]
[Site "Haarlem"]
[Date "1995.??.??"]
[Round "3"]
[White "Willemsen, Jos"]
[Black "Bouma, Albert"]
[Result "1-0"]
[ECO "B12"]
[WhiteElo "2280"]
[PlyCount "63"]
[EventDate "1995.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3 e6 5. g4 Bg6 6. Nge2 h6 7. h4 Nd7 8. Be3 Be7 9. h5 Bh7 10. Qd2 Nb6 11. b3 Qd7 12. f4 f6 13. 0-0-0 a5 14. a4 Bb4 15. Bh3 0-0-0 16. Rhg1 Rf8 17. f5 Ne7 18. fxe6 Qxe6 19. Nf4 Qd7 20. g5 Bf5 21. gxf6 gxf6 22. e6 Qd6 23. Bxf5 Nxf5 24. Ng6 Nxa4 25. Bf4 Ba3+ 26. Kb1 Nxc3+ 27. Qxc3 Qb4 28. Qxb4 Bxb4 29. Nxh8 Rxh8 30. Rg6 Bc3 31. Rxf6 Nxd4 32. e7 1-0

[Event "Haarlem AKN op 04th"]
[Site "Haarlem"]
[Date "1995.??.??"]
[Round "1"]
[White "Willemsen, Jos"]
[Black "Graaff, Rob"]
[Result "1-0"]
[ECO "B87"]
[WhiteElo "2280"]
[PlyCount "63"]
[EventDate "1995.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[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 a6 6. Bc4 e6 7. Bb3 b5 8. f3 Bb7 9. Be3 Be7 10. Qd2 Nbd7 11. 0-0-0 Nc5 12. g4 Nxb3+ 13. axb3 Nd7 14. h4 h6 15. g5 h5 16. g6 Qa5 17. gxf7+ Kxf7 18. Kb1 Ne5 19. Bg5 Qc7 20. f4 Ng4 21. f5 Bf6 22. Bxf6 gxf6 23. fxe6+ Ke7 24. Nd5+ Bxd5 25. exd5 Qc5 26. Nc6+ Ke8 27. Qd3 Rh6 28. Rhg1 Rc8 29. e7 Nf2 30. Rg8+ Kf7 31. Rxc8 Nxd3 32. e8Q+ 1-0

[Event "NED-chT 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "9"]
[White "Schendstok, Bernard"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "B79"]
[BlackElo "2280"]
[PlyCount "116"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 0-0 8. Bc4 Nc6 9. Bb3 Bd7 10. Qd2 Qa5 11. 0-0-0 Rfc8 12. h4 Ne5 13. Kb1 b5 14. Bg5 Nc4 15. Bxc4 bxc4 16. Bxf6 Bxf6 17. Nd5 Qxd2 18. Rxd2 Kg7 19. c3 h5 20. Nc2 Be6 21. Nxf6 Kxf6 22. Ne3 Rc5 23. Rhd1 Rb8 24. Rd4 a5 25. a4 Rbc8 26. Nd5+ Bxd5 27. exd5 R5c7 28. Rf4+ Kg7 29. Rdd4 Rc5 30. Rfe4 R5c7 31. Kc1 Kf6 32. g4 Kg7 33. gxh5 gxh5 34. Rf4 Kg6 35. Rd1 f6 36. Rdd4 Kf7 37. Rfe4 Rc5 38. f4 f5 39. Re2 Rg8 40. Kd2 Rg4 41. Rh2 Rc8 42. Ke3 Kf6 43. Kf3 Rg1 44. Rdd2 Rcg8 45. Rdg2 R8xg2 46. Rxg2 Rh1 47. Rg8 Rxh4 48. Rf8+ Kg6 49. Rc8 Rh3+ 50. Kg2 Rd3 51. Rxc4 Rd2+ 52. Kg3 Rxb2 53. Rc7 Rd2 54. Rxe7 Rxd5 55. Re6+ Kf7 56. Rh6 Rd3+ 57. Kh4 Kg7 58. Re6 Kf7 1/2-1/2

[Event "Staufer op"]
[Site "Schwaebisch Gmuend"]
[Date "1990.??.??"]
[Round "?"]
[White "Albrecht, Holger"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "A42"]
[BlackElo "2285"]
[PlyCount "65"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 e5 5. Be3 Nc6 6. d5 Nce7 7. Nge2 f5 8. f3 Bh6 9. Bxh6 Nxh6 10. Qd2 Nf7 11. h4 h6 12. g3 c6 13. b4 a5 14. b5 cxd5 15. cxd5 a4 16. h5 g5 17. f4 Qa5 18. Bg2 Bd7 19. Rb1 Rc8 20. 0-0 0-0 21. Qd3 Rc5 22. exf5 Rfc8 23. f6 Rxc3 24. Qe4 Qb6+ 25. Kh2 Nf5 26. fxe5 Nxe5 27. Rxf5 R8c4 28. Rxe5 Rxe4 29. Rxe4 Bf5 30. Re8+ Kf7 31. Re1 Qxb5 32. Rh8 Kxf6 33. Rf8+ 1-0

[Event "Staufer op"]
[Site "Schwaebisch Gmuend"]
[Date "1990.??.??"]
[Round "?"]
[White "Schoenfeld, Frank"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "A46"]
[BlackElo "2285"]
[PlyCount "89"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. Bf4 c5 4. e3 Qb6 5. b3 Nd5 6. Bxb8 Rxb8 7. c3 cxd4 8. exd4 Be7 9. Bc4 Nf4 10. 0-0 d5 11. Bd3 Nxd3 12. Qxd3 Qc7 13. Nbd2 b5 14. Rac1 0-0 15. Rfe1 Rd8 16. Re5 Bf6 17. Re3 Bd7 18. b4 Be8 19. Nb3 Rb6 20. Nc5 Be7 21. Rce1 h6 22. g4 Bxc5 23. dxc5 Ra6 24. g5 Qf4 25. gxh6 g6 26. h7+ Kxh7 27. Ne5 Rxa2 28. Rf3 Qg5+ 29. Kh1 Kg7 30. c6 Qd2 31. Qxd2 Rxd2 32. Ra1 Re2 33. Nxf7 Ra8 34. Ng5 Bxc6 35. Ra6 Rc8 36. Rf7+ Kh6 37. h4 Kh5 38. Kh2 Kg4 39. Raxa7 Rh8 40. Nh7 Be8 41. Nf6+ Kxh4 42. Rh7+ Rxh7 43. Rxh7+ Kg5 44. Nxe8 Rxf2+ 45. Kg3 1/2-1/2

[Event "Biel MTO op"]
[Site "Biel"]
[Date "1990.??.??"]
[Round "1"]
[White "Sher, Miron Naumovich"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "A20"]
[WhiteElo "2485"]
[BlackElo "2275"]
[PlyCount "65"]
[EventDate "1990.07.??"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "SUI"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. c4 e5 2. g3 c6 3. d4 exd4 4. Qxd4 d5 5. Nf3 dxc4 6. Qxc4 Nf6 7. Bg2 Be7 8. 0-0 0-0 9. e4 Na6 10. Nc3 Qa5 11. Bf4 Be6 12. Qe2 Rad8 13. h3 Nc5 14. Ng5 h6 15. Nxe6 Nxe6 16. Be3 Nd4 17. Qd1 Nf5 18. Bd2 Qb6 19. Na4 Qd4 20. Ba5 Qxd1 21. Rfxd1 Rd4 22. b3 Bd8 23. Bc3 Rxd1+ 24. Rxd1 Ne7 25. Nc5 Bb6 26. Nxb7 Rb8 27. Na5 Rd8 28. Rxd8+ Bxd8 29. Nc4 Nc8 30. Kf1 Kf8 31. Ke2 Ke8 32. Kd3 Ke7 33. Ne5 1-0

[Event "Staufer op"]
[Site "Schwaebisch Gmuend"]
[Date "1990.??.??"]
[Round "?"]
[White "Willemsen, Jos"]
[Black "Lauterbach, Ingrid"]
[Result "1-0"]
[ECO "A87"]
[WhiteElo "2285"]
[BlackElo "2155"]
[PlyCount "49"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. c4 f5 2. d4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3 c6 6. 0-0 d6 7. Nc3 Qc7 8. d5 h6 9. Re1 0-0 10. e4 fxe4 11. Nxe4 e5 12. dxe6 Nxe4 13. Rxe4 Qe7 14. Bf4 Rxf4 15. gxf4 Na6 16. Qc2 Nc5 17. Re2 Bxe6 18. Rae1 Qf7 19. Nh4 Bxc4 20. Re7 Bd3 21. Qd2 Qf6 22. b4 Ne4 23. Bxe4 Bxe4 24. R7xe4 d5 25. Re8+ 1-0

[Event "Staufer op"]
[Site "Schwaebisch Gmuend"]
[Date "1990.??.??"]
[Round "?"]
[White "Willemsen, Jos"]
[Black "Stillger, Bernhard"]
[Result "1/2-1/2"]
[ECO "D03"]
[WhiteElo "2285"]
[PlyCount "37"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. Nbd2 d5 5. e3 0-0 6. Bd3 c5 7. c3 cxd4 8. exd4 Nc6 9. 0-0 Bf5 10. Bxf5 gxf5 11. Bxf6 Bxf6 12. Ne1 e6 13. Nd3 Kh8 14. Qh5 Qc7 15. f4 Rg8 16. Nf3 Rg7 17. Rae1 Ne7 18. Nfe5 Nc8 19. Re3 1/2-1/2

[Event "Groningen op2"]
[Site "Groningen"]
[Date "1989.??.??"]
[Round "1"]
[White "Riemersma, Liafbern"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "C28"]
[WhiteElo "2380"]
[PlyCount "57"]
[EventDate "1989.??.??"]
[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. Bc4 Nf6 3. Nc3 Nc6 4. d3 Na5 5. Bg5 Nxc4 6. dxc4 h6 7. Be3 Bb4 8. Qd3 Bxc3+ 9. Qxc3 Qe7 10. f3 d6 11. Ne2 b6 12. Qd2 Be6 13. b3 a5 14. a4 Nd7 15. 0-0-0 Nc5 16. Nc3 0-0-0 17. Nd5 Qf8 18. b4 axb4 19. Qxb4 Bxd5 20. Rxd5 Nb7 21. Rhd1 Qe8 22. Rb5 Qc6 23. Bxb6 cxb6 24. Rxb6 Qc7 25. Rd5 Rhe8 26. a5 Re7 27. Qb5 Nxa5 28. Qxa5 Qxc4 29. Qa8+ 1-0

[Event "Groningen op2"]
[Site "Groningen"]
[Date "1989.??.??"]
[Round "5"]
[White "Visser, Yge"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "2345"]
[PlyCount "89"]
[EventDate "1989.??.??"]
[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 g6 2. d4 Bg7 3. Nf3 d6 4. Nc3 Bg4 5. Be3 Nd7 6. Be2 e5 7. Ng1 Bxe2 8. Ngxe2 Nh6 9. f3 f5 10. Qd2 Nf7 11. d5 c5 12. dxc6 bxc6 13. 0-0 Nb6 14. b3 0-0 15. Rad1 f4 16. Bf2 Qc7 17. Nc1 Rfd8 18. Qe2 d5 19. Nd3 d4 20. Nb1 c5 21. c4 a5 22. a4 Nd7 23. Na3 Nd6 24. Nb5 Qb6 25. g3 g5 26. h4 fxg3 27. Bxg3 gxh4 28. Bxh4 Re8 29. Qh2 Re6 30. Kf2 Rf8 31. Ke2 Rg6 32. Rg1 Nxb5 33. axb5 Kh8 34. Rxg6 Qxg6 35. Qg3 Qf7 36. Ra1 Ra8 37. Qg4 Bf8 38. Qg5 Bd6 39. Qf5 Qxf5 40. exf5 Kg7 41. Nf2 Kf7 42. Ne4 Be7 43. Bxe7 Kxe7 44. Rh1 Rg8 45. Rxh7+ 1-0

[Event "Zuerich op 12th"]
[Site "Zuerich"]
[Date "1988.??.??"]
[Round "3"]
[White "Schaack, Harry"]
[Black "Willemsen, Jos"]
[Result "0-1"]
[ECO "B06"]
[WhiteElo "2120"]
[BlackElo "2335"]
[PlyCount "94"]
[EventDate "1988.12.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "SUI"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. e4 g6 2. h4 h6 3. d4 Bg7 4. c3 d6 5. Be3 e5 6. d5 f5 7. exf5 gxf5 8. Qh5+ Kf8 9. f4 Nf6 10. Qd1 Qe8 11. Be2 Ng4 12. Qd2 Nxe3 13. Qxe3 exf4 14. Qxe8+ Kxe8 15. Nd2 Nd7 16. Nh3 Be5 17. 0-0-0 Nf6 18. Bf3 b5 19. Rhe1 Kf8 20. Rf1 Bd7 21. Nb3 Rg8 22. Nd4 Ng4 23. Rd2 Nh2 24. Re1 Nxf3 25. Nxf3 Re8 26. Rde2 Rg7 27. h5 Rg4 28. Kd1 Kf7 29. Kc1 Kf6 30. a3 c6 31. Kb1 cxd5 32. Ka2 a5 33. Kb1 b4 34. axb4 axb4 35. Kc2 bxc3 36. bxc3 Ba4+ 37. Kd2 Bb5 38. Rf2 Ra8 39. Nxe5 dxe5 40. Rb1 Bc4 41. Rb6+ Kg7 42. Kd1 Ra1+ 43. Kd2 Rg3 44. Rb7+ Kf8 45. Rh7 Ra2+ 46. Ke1 Re3+ 47. Kd1 Bb3+ 0-1

[Event "Zuerich op 12th"]
[Site "Zuerich"]
[Date "1988.??.??"]
[Round "4"]
[White "Willemsen, Jos"]
[Black "Van Riemsdijk, Herman Claudius"]
[Result "0-1"]
[ECO "A57"]
[WhiteElo "2335"]
[BlackElo "2330"]
[PlyCount "92"]
[EventDate "1988.12.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "SUI"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. d4 c5 2. d5 Nf6 3. c4 b5 4. Nf3 g6 5. a4 bxc4 6. Nc3 d6 7. e4 Ba6 8. Nd2 Qa5 9. Qc2 Bg7 10. Bxc4 Bxc4 11. Nxc4 Qb4 12. Nd2 0-0 13. a5 Na6 14. 0-0 Rab8 15. Ra4 Qb7 16. Qd3 Nb4 17. Qe2 Nc2 18. Nf3 Nb4 19. Nd2 Nd7 20. Nc4 Ne5 21. Nxe5 Bxe5 22. f4 Bd4+ 23. Kh1 Qa6 24. Qxa6 Nxa6 25. Nd1 Rb3 26. Rf3 Rfb8 27. Ra3 Rxa3 28. Rxa3 Rb4 29. Bd2 Rc4 30. Bc3 Bxc3 31. Nxc3 f5 32. Kg1 fxe4 33. Kf2 Nb4 34. Rb3 a6 35. g3 Kf7 36. Ke3 Rd4 37. Nxe4 Nxd5+ 38. Kf3 Rb4 39. Ng5+ Kg8 40. Rd3 Nf6 41. Re3 Kf8 42. Ne6+ Ke8 43. b3 Rb7 44. g4 Nd5 45. Rd3 Nb4 46. Re3 Nc6 0-1

[Event "Martigny op"]
[Site "Martigny"]
[Date "1988.??.??"]
[Round "9"]
[White "Willemsen, Jos"]
[Black "Van der Werf, Mark"]
[Result "1/2-1/2"]
[ECO "D38"]
[BlackElo "2260"]
[PlyCount "42"]
[EventDate "1988.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "SUI"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. c4 Nf6 2. d4 e6 3. Nf3 d5 4. Nc3 Bb4 5. Qb3 c5 6. cxd5 exd5 7. Bg5 h6 8. Bxf6 Qxf6 9. e3 0-0 10. dxc5 Bxc3+ 11. Qxc3 Qxc3+ 12. bxc3 Nd7 13. c4 dxc4 14. Bxc4 Nxc5 15. Rc1 b6 16. 0-0 Rd8 17. Rfd1 Be6 18. Nd4 Bxc4 19. Rxc4 Ne6 20. Kf1 Rd5 21. Ke2 Nxd4+ 1/2-1/2

[Event "Hilversum op"]
[Site "Hilversum"]
[Date "1984.06.10"]
[Round "4"]
[White "Borm, Frans"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "B83"]
[WhiteElo "2375"]
[PlyCount "65"]
[EventDate "1984.06.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e6 7. 0-0 Be7 8. Be3 0-0 9. f4 Bd7 10. Ndb5 Be8 11. a4 a6 12. Nd4 Qc7 13. Nb3 b6 14. Qd2 Nd7 15. Rfd1 Nc5 16. Nc1 Kh8 17. Bf3 Rc8 18. N1e2 Na5 19. Qc1 Ncb7 20. Kh1 b5 21. axb5 axb5 22. b4 Nc4 23. Bd4 Bc6 24. Ra6 e5 25. Bg1 Ra8 26. Qa1 Rac8 27. Nd5 Bxd5 28. Rxd5 exf4 29. Bd4 Ne5 30. Rxb5 Qd7 31. Rd5 Bf6 32. Bxe5 Bxe5 33. Qxe5 1-0

[Event "Hilversum op"]
[Site "Hilversum"]
[Date "1984.06.08"]
[Round "1"]
[White "Peek, Marcel"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "D86"]
[PlyCount "51"]
[EventDate "1984.06.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Be3 Nc6 9. Ne2 b6 10. h4 Na5 11. Bd3 c5 12. e5 Bb7 13. Nf4 cxd4 14. cxd4 Bd5 15. h5 Qd7 16. hxg6 hxg6 17. Nxg6 fxg6 18. Bxg6 Rf5 19. Qg4 e6 20. Rh7 Raf8 21. Bh6 R8f7 22. Rc1 Nc6 23. Rc3 Qe7 24. a3 Rxf2 25. Bxf7+ Rxf7 26. Rh3 1-0

[Event "NED Open-ch14"]
[Site "Dieren"]
[Date "1983.08.??"]
[Round "5"]
[White "Kremer, Mark"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "B31"]
[PlyCount "80"]
[EventDate "1983.08.??"]
[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 Nc6 3. Bb5 g6 4. 0-0 Bg7 5. Re1 Nf6 6. e5 Nd5 7. Nc3 Nc7 8. Bxc6 dxc6 9. Ne4 Ne6 10. d3 0-0 11. Be3 b6 12. Qd2 Qc7 13. Bh6 Rd8 14. Bxg7 Kxg7 15. Re3 Nd4 16. Rae1 Rd5 17. Ng3 Nxf3+ 18. Rxf3 Rxe5 19. Qc3 f6 20. Rxe5 Qxe5 21. Qxe5 fxe5 22. Re3 Bf5 23. Rxe5 Kf6 24. Re2 e5 25. Kf1 Rd8 26. Ke1 Rd4 27. Ne4+ Bxe4 28. dxe4 Ra4 29. a3 b5 30. Kd2 a5 31. Ke3 c4 32. c3 b4 33. axb4 axb4 34. cxb4 Rxb4 35. Rc2 Ke6 36. Kd2 Kd6 37. Kc3 Kc5 38. Rd2 Rb3+ 39. Kc2 Rb7 40. Rd8 Rf7 1/2-1/2

[Event "NED Open-ch14"]
[Site "Dieren"]
[Date "1983.08.??"]
[Round "3"]
[White "Riemens, Michael"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "A77"]
[PlyCount "37"]
[EventDate "1983.08.??"]
[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 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. Nd2 Nbd7 8. e4 a6 9. a4 Bg7 10. Be2 0-0 11. 0-0 Re8 12. a5 b5 13. axb6 Nxb6 14. Ra3 Qc7 15. b3 Nh5 16. Ndb1 Nf6 17. Nd2 Nh5 18. Ndb1 Nf6 19. Nd2 1/2-1/2

[Event "NED Open-ch14"]
[Site "Dieren"]
[Date "1983.08.??"]
[Round "4"]
[White "Willemsen, Jos"]
[Black "Blaauw, Casper"]
[Result "1-0"]
[ECO "A40"]
[PlyCount "131"]
[EventDate "1983.08.??"]
[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. e4 Bb7 4. Nd2 Bb4 5. Qc2 Qh4 6. Bd3 f5 7. Ngf3 Qg4 8. 0-0 Bxd2 9. Nxd2 Nc6 10. Qc3 fxe4 11. Nxe4 Nf6 12. f3 Qh4 13. b4 0-0 14. Bb2 Ne7 15. Rae1 Rae8 16. Ng3 Ng6 17. Bxg6 hxg6 18. Qd3 g5 19. a3 Qh7 20. Qxh7+ Kxh7 21. h3 Kg6 22. Re5 d6 23. Re3 Ba6 24. b5 Bc8 25. a4 a6 26. Rfe1 Bd7 27. Ne4 Ra8 28. Nc3 axb5 29. axb5 Nh5 30. c5 bxc5 31. dxc5 d5 32. Re5 Nf4 33. c6 Bc8 34. Rd1 Rf5 35. Rxf5 Kxf5 36. g3 Nxh3+ 37. Kg2 g4 38. fxg4+ Kxg4 39. Rd4+ Kg5 40. Bc1+ Kf6 41. Ra4 Rxa4 42. Nxa4 Ng5 43. b6 cxb6 44. Nxb6 Ba6 45. Bb2+ e5 46. Nxd5+ Kf5 47. c7 Ke6 48. Nb6 Bb7+ 49. Kh2 Nf3+ 50. Kh3 Nd2 51. c8Q+ Bxc8 52. Nxc8 Nc4 53. Bc1 e4 54. Kg2 g6 55. Kf2 Ke5 56. Ne7 Kf6 57. Nd5+ Ke5 58. Ne3 Nd6 59. Bb2+ Ke6 60. Ba3 Nb5 61. Bb2 Nd6 62. g4 g5 63. Nf1 Nc4 64. Bc3 Nd6 65. Ke3 Kd5 66. Nd2 1-0

[Event "NED Open-ch14"]
[Site "Dieren"]
[Date "1983.08.??"]
[Round "7"]
[White "Willemsen, Jos"]
[Black "Galje, Hans"]
[Result "0-1"]
[ECO "B08"]
[PlyCount "60"]
[EventDate "1983.08.??"]
[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 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 0-0 6. 0-0 Bg4 7. h3 Bxf3 8. Bxf3 Nc6 9. Be3 e5 10. d5 Ne7 11. g3 Ne8 12. Qd2 f5 13. Bg2 Nf6 14. Bg5 Qd7 15. Rae1 fxe4 16. g4 h5 17. Bxf6 Bxf6 18. Rxe4 Rf7 19. f3 Raf8 20. Rb4 c6 21. Ra4 cxd5 22. Rxa7 d4 23. Ne2 Nd5 24. c3 Ne3 25. Rc1 Bd8 26. cxd4 Nxg2 27. Kxg2 Rxf3 28. Ng1 R3f4 29. dxe5 Rf2+ 30. Qxf2 Rxf2+ 0-1

[Event "NED Open-ch14"]
[Site "Dieren"]
[Date "1983.08.??"]
[Round "6"]
[White "Willemsen, Jos"]
[Black "Kuijf, Hans"]
[Result "1/2-1/2"]
[ECO "A56"]
[BlackElo "2345"]
[PlyCount "121"]
[EventDate "1983.08.??"]
[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 e5 4. Nc3 d6 5. e4 Be7 6. Nf3 0-0 7. Bd3 Ne8 8. 0-0 Bg4 9. h3 Bxf3 10. Qxf3 Bg5 11. Qe2 g6 12. g3 Bxc1 13. Raxc1 Ng7 14. Kh2 Nd7 15. a3 Qe7 16. Rce1 f5 17. exf5 Nxf5 18. Bxf5 Rxf5 19. f4 Raf8 20. Nb5 Qf6 21. fxe5 Nxe5 22. Rxf5 Qxf5 23. Kg2 Nxc4 24. Qe6+ Rf7 25. Qxf5 Rxf5 26. b3 Na5 27. Re8+ Kg7 28. b4 cxb4 29. axb4 Rxd5 30. Re7+ Kf6 31. Rxh7 Rxb5 32. bxa5 d5 33. h4 a6 34. Kf3 Rb3+ 35. Kf4 Rb4+ 36. Kf3 Rb5 37. Rd7 Ke6 38. Rg7 Kf6 39. Rd7 Rxa5 40. Rxb7 Rb5 41. Ra7 Rb6 42. g4 Ke5 43. h5 Rf6+ 44. Kg3 gxh5 45. gxh5 d4 46. Rd7 Ke4 47. Re7+ Kd5 48. Rd7+ Kc4 49. Rc7+ Kb3 50. Rb7+ Kc2 51. Rc7+ Kd2 52. Kg4 d3 53. Kg5 Rf8 54. Ra7 Rg8+ 55. Kh6 Kc3 56. Rxa6 Rd8 57. Ra1 Kd4 58. Kg7 Ke5 59. h6 Rd7+ 60. Kg6 Rd6+ 61. Kg7 1/2-1/2

[Event "NED Open-ch13"]
[Site "Dieren"]
[Date "1982.08.??"]
[Round "9"]
[White "Ejsing, Esben"]
[Black "Willemsen, Jos"]
[Result "1-0"]
[ECO "A04"]
[PlyCount "79"]
[EventDate "1982.06.??"]
[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 Nc6 3. d3 g6 4. g3 Bg7 5. Bg2 d6 6. 0-0 e6 7. c3 Nf6 8. Re1 e5 9. Nbd2 0-0 10. Nc4 Qc7 11. a4 b6 12. Bg5 h6 13. Bxf6 Bxf6 14. Ne3 Bg7 15. Nd2 Ne7 16. Ndc4 Bb7 17. Qb3 Bc6 18. Qa3 f5 19. Nd5 Bxd5 20. exd5 f4 21. Nd2 Kh7 22. b4 Rac8 23. Rac1 h5 24. bxc5 bxc5 25. Qa2 Bh6 26. Rb1 Rf7 27. Ne4 Qd7 28. Rb7 Rc7 29. Nxc5 Qc8 30. Rxc7 Qxc7 31. Ne4 f3 32. Bh3 Nf5 33. Rb1 g5 34. Bxf5+ Rxf5 35. Qa3 Bf8 36. Qb4 Kg6 37. Qb7 Qa5 38. Qb5 Qxb5 39. Rxb5 Rf7 40. a5 1-0

[Event "NED Open-ch13"]
[Site "Dieren"]
[Date "1982.08.??"]
[Round "4"]
[White "Pieterse, Gert"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "A77"]
[PlyCount "80"]
[EventDate "1982.06.??"]
[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 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. Nd2 Nbd7 8. Nc4 Nb6 9. Nxb6 Qxb6 10. e4 Bg7 11. Be2 0-0 12. 0-0 Re8 13. Qc2 Ng4 14. h3 Nh6 15. g4 f5 16. exf5 gxf5 17. g5 Nf7 18. f4 c4+ 19. Kg2 Qc5 20. Bf3 b5 21. a3 Bd7 22. Bd2 Nh8 23. h4 Ng6 24. Kg3 Ne7 25. Rad1 a5 26. Be1 b4 27. Bf2 Qc7 28. Ne2 Rac8 29. Bd4 Bxd4 30. Nxd4 Qc5 31. axb4 axb4 32. Rfe1 c3 33. Ne6 Bxe6 34. Rxe6 Ng6 35. Qxf5 Nf8 36. g6 hxg6 37. Rxg6+ Nxg6 38. Qxg6+ Kh8 39. Qf6+ Kg8 40. Qg6+ Kh8 1/2-1/2

[Event "NED Open-ch13"]
[Site "Dieren"]
[Date "1982.08.??"]
[Round "7"]
[White "Willemsen, Jos"]
[Black "Perrenet, Jacob"]
[Result "1-0"]
[ECO "B00"]
[PlyCount "85"]
[EventDate "1982.06.??"]
[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 Nc6 2. d4 e5 3. dxe5 Bc5 4. Nf3 Nge7 5. Bc4 0-0 6. Bd5 Qe8 7. 0-0 Ng6 8. Kh1 Ncxe5 9. Nxe5 Qxe5 10. f4 Qf6 11. Qh5 Qa6 12. Rd1 d6 13. f5 Ne5 14. Bf4 Nd7 15. Nc3 Nf6 16. Qh4 c6 17. Bb3 d5 18. e5 Ne8 19. f6 Kh8 20. Rd3 Rg8 21. Rf3 Be6 22. Raf1 gxf6 23. exf6 Rg4 24. Qh5 Rg6 25. h3 Bf8 26. Be3 Rd8 27. Rd1 b6 28. Qh4 Nd6 29. Qf2 Qc8 30. Bf4 Nf5 31. Ne2 Bc5 32. Qf1 Nh4 33. Rg3 Rdg8 34. c3 Nf5 35. Rxg6 Rxg6 36. Bc2 Qg8 37. g4 Ne3 38. Bxe3 Bxe3 39. Bxg6 Qxg6 40. Nf4 Qe4+ 41. Ng2 c5 42. Qe2 d4 43. Qxe3 1-0

[Event "Biel-14 MTO op"]
[Site "Biel"]
[Date "1981.07.??"]
[Round "1"]
[White "Willemsen, Jos"]
[Black "Beilfuss, Wilfried"]
[Result "1-0"]
[ECO "D25"]
[PlyCount "81"]
[EventDate "1981.07.??"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "SUI"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Nbd7 5. Bxc4 Nb6 6. Bb3 Bf5 7. 0-0 e6 8. Qe2 c6 9. Nbd2 h6 10. Rd1 Bh7 11. Nf1 Be7 12. Ng3 0-0 13. e4 Qc7 14. Ne5 c5 15. Bf4 Bd6 16. Rac1 Qb8 17. Nc6 bxc6 18. Bxd6 Qxd6 19. dxc5 Qc7 20. cxb6 axb6 21. Qc4 c5 22. f3 Rfd8 23. Ne2 Rxd1+ 24. Rxd1 Rd8 25. Nc3 Rxd1+ 26. Bxd1 Qd8 27. Be2 Kf8 28. Qa6 Nh5 29. g3 f5 30. exf5 exf5 31. Na4 f4 32. g4 Nf6 33. b3 Qd4+ 34. Kg2 Nd5 35. Nxb6 Ne3+ 36. Kh3 h5 37. Qc8+ Ke7 38. Qc7+ Kf6 39. Nd7+ Kg5 40. Qd8+ Kg6 41. Bd3+ 1-0

[Event "Biel-14 MTO op"]
[Site "Biel"]
[Date "1981.07.??"]
[Round "1"]
[White "Willemsen, Jos"]
[Black "Fahnenschmidt, Gerhard"]
[Result "1-0"]
[ECO "E14"]
[BlackElo "2360"]
[PlyCount "127"]
[EventDate "1981.07.??"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "SUI"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 Bb7 5. Bd3 Be7 6. 0-0 0-0 7. b3 c5 8. Bb2 cxd4 9. exd4 d5 10. Nbd2 Nc6 11. Rc1 Rc8 12. a3 dxc4 13. bxc4 Qd6 14. Re1 Rfd8 15. Qe2 Qf4 16. Ne4 Na5 17. g3 Qh6 18. Neg5 Bxf3 19. Nxf3 Bf8 20. Bb1 Qh5 21. Kg2 Ne8 22. h3 Nd6 23. Ba2 Nc6 24. Rcd1 Qa5 25. d5 exd5 26. Rxd5 Qa6 27. c5 Qxe2 28. Rxe2 bxc5 29. Rxc5 h6 30. Rec2 Ne7 31. Ne5 Rxc5 32. Rxc5 Rb8 33. Bc1 Rb7 34. Ra5 Nec8 35. Bd5 Rb1 36. Be3 Nb6 37. Bxb6 axb6 38. Ra8 Rc1 39. Bxf7+ Nxf7 40. Ng6 Ng5 41. Nxf8 Kf7 42. Nd7 b5 43. Ra7 Ke6 44. Nb6 Rc2 45. Rxg7 Ne4 46. Kf3 Kf6 47. Rc7 Ng5+ 48. Kg2 Rd2 49. Nd7+ Ke7 50. Nc5+ Kd8 51. Rb7 Rc2 52. Rxb5 Kc7 53. h4 Kc6 54. a4 Nf7 55. Nb3 Ra2 56. Nd4+ Kc7 57. Rf5 Nd8 58. Rf6 Rxa4 59. Nb5+ Kd7 60. Rxh6 Nf7 61. Rf6 Ke7 62. Rb6 Kf8 63. Nc3 Rc4 64. Nd5 1-0

[Event "Biel-14 MTO op"]
[Site "Biel"]
[Date "1981.07.??"]
[Round "1"]
[White "Willemsen, Jos"]
[Black "Titz, Heimo"]
[Result "0-1"]
[ECO "A73"]
[PlyCount "96"]
[EventDate "1981.07.??"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "SUI"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. c4 Nf6 2. d4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 Bg4 9. h3 Bxf3 10. Bxf3 0-0 11. 0-0 Nbd7 12. Bf4 Qe7 13. Re1 Ne5 14. Be2 h6 15. a4 g5 16. Bh2 a6 17. a5 Rab8 18. Qb1 Nfd7 19. Nd1 b6 20. axb6 Rxb6 21. Rxa6 Rfb8 22. Rxb6 Rxb6 23. Qc2 Qd8 24. f4 gxf4 25. Bxf4 Qh4 26. Rf1 Ng6 27. Bh2 Nde5 28. Kh1 Rb4 29. Nf2 Qg5 30. Nd3 Nxd3 31. Qxd3 Be5 32. Qf3 Rb7 33. Bxe5 Nxe5 34. Qa3 Kg7 35. Bf3 Qd2 36. b3 Qd3 37. Rg1 Rxb3 38. Qa7 Rb1 39. Rxb1 Qxb1+ 40. Kh2 Qc1 41. Qe7 Qf4+ 42. Kg1 Nxf3+ 43. gxf3 Qg3+ 44. Kf1 Qxf3+ 45. Ke1 Qf6 46. Qd7 Qf4 47. Kd1 c4 48. Qc6 Qf1+ 0-1

[Event "NED Open-ch09 Reinbouw"]
[Site "Velp"]
[Date "1978.08.??"]
[Round "2"]
[White "Willemsen, Jos"]
[Black "Dieks, Roy G"]
[Result "0-1"]
[ECO "B30"]
[BlackElo "2250"]
[PlyCount "82"]
[EventDate "1978.08.??"]
[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 Nc6 3. Bb5 Qc7 4. 0-0 a6 5. Bxc6 Qxc6 6. Re1 d6 7. h3 e6 8. c3 Nf6 9. Qe2 c4 10. b3 cxb3 11. axb3 Qb6 12. b4 Be7 13. d3 0-0 14. Be3 Qc7 15. b5 b6 16. c4 a5 17. Nc3 Bb7 18. Na4 Nd7 19. Bg5 Bxg5 20. Nxg5 h6 21. Nf3 Nc5 22. Nd2 e5 23. Ra3 Ne6 24. Nb3 Rab8 25. Nc3 f5 26. Nd5 Bxd5 27. cxd5 Nf4 28. Qd2 Qd7 29. Nd4 Nxh3+ 30. gxh3 exd4 31. Qb2 f4 32. Kh2 Rbe8 33. Rg1 Re5 34. f3 Rh5 35. Rg4 Rxh3+ 36. Kxh3 h5 37. Qg2 Rf6 38. Kh2 hxg4 39. Qxg4 Qxb5 40. Qc8+ Kh7 41. Ra2 Qb1 0-1

[Event "Hoogovens TK Reserve-B"]
[Site "Wijk aan Zee"]
[Date "1969.01.25"]
[Round "4"]
[White "Willemsen, Jos"]
[Black "Rischbieth, Norman"]
[Result "0-1"]
[ECO "E82"]
[PlyCount "46"]
[EventDate "1969.01.22"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. e4 d6 4. d4 Bg7 5. f3 0-0 6. Be3 b6 7. Bd3 Bb7 8. Nge2 c5 9. d5 e6 10. Qd2 exd5 11. cxd5 Nbd7 12. a4 Re8 13. Kf2 Ne5 14. Rhb1 Nfd7 15. Nc1 f5 16. exf5 Qh4+ 17. Kf1 Qxh2 18. Bb5 Qh1+ 19. Kf2 a6 20. Bf1 gxf5 21. Nb3 Nf6 22. Be2 Qh4+ 23. Kg1 Nc4 0-1

[Event "NED-ch U18"]
[Site "Delft"]
[Date "1966.??.??"]
[Round "5"]
[White "Willemsen, Jos"]
[Black "Timman, Jan H"]
[Result "1/2-1/2"]
[ECO "A95"]
[PlyCount "28"]
[EventDate "1966.??.??"]
[EventType "tourn"]
[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 f5 3. Nf3 Nf6 4. g3 Be7 5. Bg2 0-0 6. 0-0 d5 7. Nc3 c6 8. Qd3 Qe8 9. Bf4 Ne4 10. Rad1 Nd7 11. Ne5 Bf6 12. Nxd7 Bxd7 13. f3 Nxc3 14. bxc3 Kh8 1/2-1/2

[Event "NED U18-ch"]
[Site "The Hague"]
[Date "1965.??.??"]
[Round "3"]
[White "Timman, Jan H"]
[Black "Willemsen, Jos"]
[Result "1/2-1/2"]
[ECO "C50"]
[PlyCount "39"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Bc5 5. Nc3 d6 6. a3 a5 7. Bg5 h6 8. Bxf6 Qxf6 9. Nd5 Qd8 10. c3 0-0 11. Qd2 Ne7 12. 0-0 Bg4 13. Ne3 Bxf3 14. gxf3 Ng6 15. Nf5 Nf4 16. Kh1 Kh7 17. d4 Bb6 18. Rg1 g6 19. Ne3 c6 20. Rad1 1/2-1/2

