[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.04"]
[Round "5"]
[White "De Haas, Piet"]
[Black "Leeuwenburgh, Evert"]
[Result "1-0"]
[ECO "C99"]
[WhiteElo "2171"]
[PlyCount "73"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Bd7 13. Nf1 cxd4 14. cxd4 Nc6 15. Be3 exd4 16. Nxd4 Nxd4 17. Bxd4 Bc6 18. Rc1 Qb7 19. Ng3 g6 20. Qf3 Nd7 21. Nf5 Ne5 22. Qg3 Rfe8 23. Nh6+ Kg7 24. Nf5+ Kf8 25. f4 gxf5 26. exf5 Bf6 27. fxe5 Bxe5 28. Rxe5 Rxe5 29. Bxe5 dxe5 30. f6 Bd5 31. Qg7+ Ke8 32. Bf5 Qb6+ 33. Kh1 Qd6 34. Rc7 Kd8 35. Re7 Bxg2+ 36. Qxg2 Qxf6 37. Rd7+ 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.04"]
[Round "6"]
[White "Schuil, Jeroen"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "E32"]
[BlackElo "2171"]
[PlyCount "36"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 0-0 5. e4 c5 6. d5 exd5 7. cxd5 Nxe4 8. Bd3 Re8 9. Nge2 Nf6 10. Bg5 h6 11. Bxf6 Qxf6 12. 0-0 d6 13. Nb5 Ba5 14. Nec3 a6 15. Ne4 Rxe4 16. Bxe4 axb5 17. b4 Bxb4 18. a4 Bd7 0-1

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.03"]
[Round "4"]
[White "De Haas, Piet"]
[Black "Strik, Aart"]
[Result "1/2-1/2"]
[ECO "C65"]
[WhiteElo "2171"]
[PlyCount "108"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. 0-0 Nf6 5. Bxc6 dxc6 6. Nxe5 Nxe4 7. Qe2 Qd5 8. d3 Qxe5 9. Qxe4 Qxe4 10. dxe4 Bd7 11. Nd2 0-0 12. Nb3 Bb6 13. Bd2 Be6 14. Bc3 Rad8 15. Rad1 Bg4 16. Rxd8 Rxd8 17. Re1 Bd1 18. Na1 Bh5 19. Kf1 f6 20. Nb3 Bf7 21. g3 Bh5 22. Bd2 Bf3 23. e5 fxe5 24. Rxe5 Bd1 25. Bc3 Rd7 26. Na1 Bf3 27. Bb4 c5 28. Be1 c4 29. Bb4 c5 30. Bc3 Rd1+ 31. Re1 Rd7 32. Be5 Kf7 33. Bf4 Rd1 34. Rxd1 Bxd1 35. Ke1 Bf3 36. c3 Bd8 37. Nc2 Bd5 38. Ne3 Be6 39. Bd6 b6 40. f4 g6 41. Kf2 Ke8 42. Kf3 Kd7 43. Be5 b5 44. Ke4 a5 45. g4 b4 46. f5 gxf5+ 47. gxf5 Bf7 48. Ng4 a4 49. a3 Bg5 50. cxb4 Kc6 51. Bc3 cxb4 52. Bxb4 Bd5+ 53. Ke5 h5 54. Nf2 Bd8 1/2-1/2

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.03"]
[Round "3"]
[White "Slings, Stefan"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "B11"]
[WhiteElo "2081"]
[BlackElo "2171"]
[PlyCount "105"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 c6 2. Nc3 d5 3. Qf3 e6 4. Qg3 Ne7 5. d3 Ng6 6. f4 d4 7. Nb1 c5 8. a4 Nc6 9. Bd2 f5 10. Be2 Be7 11. Nf3 0-0 12. e5 b6 13. h4 Nh8 14. Na3 Nf7 15. Nc4 Ba6 16. Ng5 Qd7 17. Qf3 Nxg5 18. hxg5 g6 19. Qh3 Rf7 20. Bf3 Bxc4 21. dxc4 Rd8 22. g4 Rg7 23. gxf5 gxf5 24. Bh5 Nb4 25. Bxb4 cxb4 26. Qd3 Bc5 27. Bf3 Kf8 28. Ke2 Ke7 29. Rh6 Rf8 30. b3 Kd8 31. Rah1 Kc7 32. Bg2 Rff7 33. R1h3 Kd8 34. Qf3 a5 35. Kd3 Ke7 36. Rf6 Rg6 37. Rxf7+ Kxf7 38. Rxh7+ Rg7 39. Qh5+ Kf8 40. Rh8+ Rg8 41. Qh6+ Qg7 42. Rxg8+ Kxg8 43. Qxe6+ Qf7 44. Bd5 Qxe6 45. Bxe6+ Kg7 46. Bxf5 Kf7 47. Ke4 Ke7 48. Kd5 Kf7 49. Bd3 Ke7 50. f5 Kf7 51. g6+ Kg7 52. f6+ Kf8 53. e6 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.02"]
[Round "1"]
[White "De Haas, Piet"]
[Black "Bakker, Rommert"]
[Result "1-0"]
[ECO "B57"]
[WhiteElo "2171"]
[PlyCount "31"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 g6 7. Nxc6 bxc6 8. e5 Nh5 9. Qf3 d5 10. Nxd5 cxd5 11. Bxd5 Rb8 12. Bxf7+ Kd7 13. Qd5+ Kc7 14. Qc5+ Kb7 15. Bd5+ Ka6 16. Qc6+ 1-0

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.07"]
[Round "6"]
[White "De Haas, Piet"]
[Black "Anink, Marco"]
[Result "1-0"]
[ECO "B33"]
[WhiteElo "2068"]
[BlackElo "1649"]
[PlyCount "111"]
[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. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5 Be7 10. c3 Nxe4 11. Nxb5 axb5 12. Bxb5 0-0 13. Be3 Bb7 14. Bb6 Qd7 15. a4 Bg5 16. 0-0 Nd2 17. f4 Nxf1 18. fxg5 Nxh2 19. Kxh2 Kh8 20. Qh5 Ba6 21. Rh1 Bxb5 22. axb5 Nb8 23. Qf3 Ra4 24. b4 Qe6 25. Qe4 Nd7 26. Kg3 Qg6 27. Qxg6 fxg6 28. Bc7 Rf5 29. b6 Rxg5+ 30. Kf3 Rf5+ 31. Ke3 Ra6 32. b7 Rf8 33. Ne7 Ra7 34. Nxg6+ Kg8 35. Nxf8 Rxb7 36. Ne6 Nf6 37. Rd1 d5 38. Ra1 h5 39. Ng5 Ng4+ 40. Kd3 g6 41. Bd6 Kg7 42. Ke2 Kf6 43. Nf3 Rb6 44. Bc5 Rc6 45. Ra7 Nh6 46. Kd2 Nf5 47. Bf2 Nd6 48. Be1 Nc4+ 49. Ke2 Nd6 50. Bg3 e4 51. Be5+ Kf5 52. Nd4+ Kxe5 53. Nxc6+ Kf4 54. Nd4 e3 55. Re7 Ne4 56. Rxe4+ 1-0

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.07"]
[Round "5"]
[White "Van Zutphen, Jimmy"]
[Black "De Haas, Piet"]
[Result "1/2-1/2"]
[ECO "C29"]
[WhiteElo "1902"]
[BlackElo "2068"]
[PlyCount "33"]
[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. Nc3 Nf6 2. e4 e5 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Be7 6. d4 0-0 7. Bd3 f5 8. exf6 Bxf6 9. 0-0 Nc6 10. Nxe4 dxe4 11. Bxe4 Nxd4 12. c3 Nxf3+ 13. Bxf3 c6 14. Be3 Be5 15. Bc5 Qxd1 16. Raxd1 Re8 17. Bd4 1/2-1/2

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.06"]
[Round "4"]
[White "De Haas, Piet"]
[Black "Sijpkens, Michiel"]
[Result "1-0"]
[ECO "C68"]
[WhiteElo "2068"]
[BlackElo "1721"]
[PlyCount "77"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. 0-0 Bd6 6. d4 Bg4 7. dxe5 Bxf3 8. Qxf3 Bxe5 9. Nd2 Qf6 10. Qxf6 Nxf6 11. c3 Nd7 12. Nc4 0-0-0 13. Be3 Rhe8 14. Rad1 Bf6 15. f3 Ne5 16. Nxe5 Bxe5 17. Kf2 g6 18. f4 Bg7 19. Kf3 Re6 20. Rxd8+ Kxd8 21. Bd4 Bxd4 22. cxd4 Rd6 23. Ke3 Kd7 24. g4 Ke7 25. g5 a5 26. Rc1 Rd8 27. Rc5 Ra8 28. d5 Kd6 29. Kd4 cxd5 30. Rxd5+ Ke7 31. f5 Rd8 32. a4 c6 33. Rxd8 Kxd8 34. Ke5 Ke7 35. h3 b5 36. axb5 cxb5 37. Kd5 gxf5 38. exf5 f6 39. h4 1-0

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.06"]
[Round "3"]
[White "Savchenko, Stanislav"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "E97"]
[WhiteElo "2537"]
[BlackElo "2068"]
[PlyCount "47"]
[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. 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. b4 Nh5 10. Re1 f5 11. Ng5 Nf6 12. Bf3 h6 13. Ne6 Bxe6 14. dxe6 c6 15. Qb3 fxe4 16. Nxe4 Nxe4 17. Bxe4 Rf6 18. b5 Kh7 19. Rd1 Rxe6 20. Rb1 Rc8 21. Be3 Qc7 22. Bxa7 c5 23. Qh3 Rf6 24. b6 1-0

[Event "Haarlem Nova College op 1st"]
[Site "Haarlem"]
[Date "2002.07.05"]
[Round "1"]
[White "De Haas, Piet"]
[Black "Lavrijsen, Barend"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "2068"]
[BlackElo "1650"]
[PlyCount "63"]
[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 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 4. Qe2 d5 5. d3 Bd6 6. Nf3 0-0 7. dxe4 dxe4 8. Nd4 a6 9. Be3 Qd7 10. g3 Be5 11. c3 c5 12. Nb3 b6 13. Bg2 Bb7 14. 0-0 a5 15. Rd1 Ba6 16. Qh5 Qc6 17. Qxe5 Re8 18. Qf4 Nd7 19. Rd6 Qb7 20. N1d2 Bd3 21. Rxd3 Nf6 22. Rd6 Nd5 23. Bxe4 Nxf4 24. Bxb7 Rad8 25. Bxf4 Rxd6 26. Bxd6 g6 27. Ne4 a4 28. Nf6+ Kg7 29. Nxe8+ Kh6 30. h4 axb3 31. Bf8+ Kh5 32. Bf3# 1-0

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.26"]
[Round "9"]
[White "De Haas, Piet"]
[Black "Van den Berg, Ad"]
[Result "1-0"]
[ECO "B38"]
[BlackElo "2210"]
[PlyCount "103"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[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 b6 9. 0-0 Bb7 10. f3 Qb8 11. Qd2 Rd8 12. Rfd1 d6 13. Rac1 Rd7 14. Bf1 Qf8 15. g3 Nxd4 16. Bxd4 Bh6 17. Be3 Bxe3+ 18. Qxe3 e6 19. Rd2 Rad8 20. Rcd1 Bc6 21. Bh3 Ne8 22. Ne2 Rc7 23. b3 Bd7 24. Nc3 Rc5 25. a4 h5 26. Bf1 a5 27. Ne2 Kh7 28. Nc1 Qh6 29. Kf2 Qxe3+ 30. Kxe3 e5 31. Ne2 Rc7 32. Nc3 Bc6 33. Bh3 Kg7 34. Bg2 Re7 35. h4 f5 36. Bh3 Rf7 37. Ne2 Bd7 38. Bg2 Re7 39. Nc3 Bc6 40. Bh3 Kf6 41. Bf1 Rf7 42. Be2 Rdd7 43. exf5 gxf5 44. f4 Rde7 45. Bxh5 exf4+ 46. Kxf4 Rh7 47. Nd5+ Bxd5 48. Rxd5 Nc7 49. Rxf5+ Ke6 50. Bg4 Kd7 51. Rf6+ Ne6+ 52. Kf3 1-0

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.25"]
[Round "8"]
[White "Happel, Henk"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "E92"]
[WhiteElo "2224"]
[PlyCount "120"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 0-0 6. Be2 e5 7. d5 a5 8. 0-0 Na6 9. Bg5 h6 10. Bh4 Bd7 11. Nd2 Qe8 12. b3 Nh7 13. f3 h5 14. a3 Bh6 15. Bf2 Qe7 16. Qc2 Qg5 17. Rfd1 f5 18. Rab1 Nc5 19. b4 axb4 20. axb4 Na4 21. Nb5 Bxb5 22. cxb5 Rf7 23. Nc4 Qd8 24. Na5 Nb6 25. exf5 gxf5 26. Nxb7 Qg5 27. Nxd6 Rg7 28. Bf1 cxd6 29. Bxb6 Qg6 30. Bf2 Ng5 31. Kh1 Kh7 32. Ra1 Rag8 33. Ra7 h4 34. Rxg7+ Rxg7 35. h3 Nf7 36. b6 Nd8 37. Qc8 Qf6 38. Bd3 Rf7 39. Ba6 Qe7 40. Qc7 Bg5 41. Qxe7 Rxe7 42. Bc8 Kg6 43. Ra1 e4 44. Ra7 Re8 45. Rd7 e3 46. Be1 e2 47. b7 Nxb7 48. Bxb7 Bf4 49. Rc7 Re3 50. g3 Bxg3 51. Rc1 Rd3 52. Rc2 Bxe1 53. Rxe2 Bxb4 54. Kg2 Bc5 55. Rc2 Kg5 56. Rc4 Rd2+ 57. Kh1 Bd4 58. f4+ Kxf4 59. Rb4 Kg3 60. Rb3+ Kf2 0-1

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.23"]
[Round "7"]
[White "De Haas, Piet"]
[Black "Ludden, Gert Jan"]
[Result "0-1"]
[ECO "B32"]
[BlackElo "2263"]
[PlyCount "106"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 a6 6. Nd6+ Bxd6 7. Qxd6 Qf6 8. Qd1 Qg6 9. Nc3 Nge7 10. Be3 d5 11. Nxd5 Nxd5 12. Qxd5 Be6 13. Qd2 Qxe4 14. f3 Qa4 15. b3 Qh4+ 16. g3 Qe7 17. c3 0-0 18. Bg2 Rfd8 19. Qe2 Bf5 20. Kf2 Bd3 21. Qb2 e4 22. f4 f5 23. Rhe1 Qf6 24. a3 Rac8 25. Rac1 b5 26. Kg1 Qe6 27. Kh1 Kf7 28. Rcd1 Na5 29. b4 Nc4 30. Qc1 Nxe3 31. Rxe3 Qc4 32. Bh3 g6 33. g4 Be2 34. Re1 Bf3+ 35. Bg2 Bxg4 36. h3 Bh5 37. Qb2 Rd7 38. Bf1 Qd5 39. Qf2 Qd2 40. Qxd2 Rxd2 41. a4 Bf3+ 42. Kg1 bxa4 43. Bxa6 Rcd8 44. Bc4+ Kf6 45. b5 Rg2+ 46. Kf1 Rdd2 47. Ra1 Rh2 48. Ke1 Rb2 49. Bf1 a3 50. c4 a2 51. Rc3 Rb1+ 52. Rc1 Rxa1 53. Rxa1 Rb2 0-1

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.22"]
[Round "6"]
[White "Oosterom, Erik"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "E97"]
[WhiteElo "2199"]
[PlyCount "122"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[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. b4 Nh5 10. Re1 f5 11. Ng5 Nf6 12. Bf3 c6 13. b5 h6 14. Ne6 Bxe6 15. dxe6 f4 16. Ba3 Ne8 17. Qb3 c5 18. Red1 Qc8 19. Rd3 Qxe6 20. Rad1 b6 21. Nd5 Nxd5 22. Rxd5 Rf7 23. Bb2 Bf8 24. R5d2 Nf6 25. Qd3 g5 26. Be2 Rc8 27. Bf1 Rg7 28. a4 Qf7 29. Bc3 Qg6 30. Re1 Rcc7 31. a5 g4 32. axb6 axb6 33. Ra2 Ra7 34. Rxa7 Rxa7 35. Qc2 Qe8 36. Ra1 Rxa1 37. Bxa1 Qa8 38. Bc3 Qxe4 39. Bd3 Qb7 40. Qa2 Be7 41. Qa6 Qb8 42. Bf5 Kg7 43. Be6 h5 44. h3 Ne4 45. Be1 Ng5 46. Bd5 gxh3 47. gxh3 Nxh3+ 48. Kh2 Ng5 49. f3 Nh7 50. Qb7 Qxb7 51. Bxb7 Bf6 52. Bd5 Nf8 53. Bd2 Ng6 54. Be1 Kf8 55. Kh3 Ne7 56. Be6 Ke8 57. Bd2 Kd8 58. Be1 Kc7 59. Bh4 Bxh4 60. Kxh4 d5 61. cxd5 Kd6 0-1

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.21"]
[Round "5"]
[White "Wunnink, Michael"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "E97"]
[WhiteElo "2210"]
[PlyCount "91"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[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. b4 Nh5 10. Re1 f5 11. Ng5 Nf6 12. Bf3 c6 13. Bb2 h6 14. Ne6 Bxe6 15. dxe6 fxe4 16. Nxe4 Nxe4 17. Bxe4 Rf6 18. b5 Rxe6 19. Qb3 Kh8 20. Rad1 Qc7 21. bxc6 bxc6 22. Qh3 Rf6 23. Bc1 Qc8 24. Qa3 Nf5 25. Qa4 Ne7 26. Ba3 Qc7 27. Re2 Raf8 28. Red2 c5 29. Rb1 Rf4 30. f3 Nc8 31. Rb7 Qd8 32. Bxc5 Rxe4 33. fxe4 Qg5 34. Qd7 Rg8 35. Rf2 dxc5 36. Qd2 Qxd2 37. Rxd2 Nb6 38. Rxa7 Bf8 39. a4 Nxc4 40. Rdd7 Rg7 41. Rxg7 Bxg7 42. a5 Bf6 43. a6 Nb6 44. Rb7 c4 45. a7 c3 46. Rxb6 1-0

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.20"]
[Round "4"]
[White "De Haas, Piet"]
[Black "Termeulen, Albert"]
[Result "1/2-1/2"]
[ECO "B85"]
[BlackElo "2214"]
[PlyCount "102"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. 0-0 Be7 8. f4 0-0 9. Kh1 Qc7 10. a4 Nc6 11. Nb3 b6 12. Bf3 Rb8 13. Qe2 Bb7 14. Be3 Rfe8 15. Rad1 Bf8 16. Qf2 Nd7 17. Rd2 Ba8 18. Rfd1 Na5 19. Nxa5 bxa5 20. e5 Bxf3 21. Qxf3 d5 22. Bd4 Rec8 23. Ne2 Nc5 24. Bxc5 Bxc5 25. c3 g6 26. Qd3 Qc6 27. Ra1 Rb7 28. Nd4 Bxd4 29. Qxd4 Qc4 30. Qxc4 Rxc4 31. g3 Re4 32. Kg2 Rc7 33. Ra3 Rcc4 34. Rb3 Rxa4 35. Rb6 Ra2 36. Kf3 h5 37. Rxa6 Rc4 38. Ke3 a4 39. Kd3 Rc7 40. Rb6 a3 41. Rb3 axb2 42. Rdxb2 Rxb2 43. Rxb2 Ra7 44. c4 Ra3+ 45. Kd4 dxc4 46. Kxc4 h4 47. Rg2 Kg7 48. Kd4 Kh6 49. Ke4 Kh5 50. g4+ Kh6 51. Rf2 Rb3 1/2-1/2

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.18"]
[Round "3"]
[White "Popov, Luben"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "E61"]
[WhiteElo "2347"]
[PlyCount "59"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[SourceQuality "1"]

1. c4 g6 2. Nc3 Bg7 3. Nf3 d6 4. d4 Nf6 5. Bg5 0-0 6. e3 c6 7. Be2 Nbd7 8. Qc2 Qc7 9. 0-0 e5 10. Rfd1 b6 11. b4 Re8 12. Rac1 Bb7 13. dxe5 dxe5 14. Nd2 Bf8 15. Qb3 c5 16. Nd5 Nxd5 17. cxd5 Bd6 18. Ne4 Kg7 19. Bb5 Rec8 20. Qa4 Nb8 21. bxc5 bxc5 22. Bf6+ Kg8 23. Nxd6 Qxd6 24. Qh4 Rc7 25. Rc4 h5 26. Re4 Nd7 27. Bxd7 Rxd7 28. Rxe5 Rc8 29. g4 Qa6 30. Rxh5 1-0

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.17"]
[Round "2"]
[White "Piket, Joop J"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "A45"]
[WhiteElo "2228"]
[PlyCount "72"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 Ne4 3. Bf4 c5 4. d5 Qb6 5. Nd2 Nxd2 6. Bxd2 e6 7. e4 d6 8. Bc3 e5 9. a4 Be7 10. f4 exf4 11. a5 Bh4+ 12. Kd2 Qd8 13. Bxg7 Rg8 14. Bc3 Nd7 15. Nf3 Bf6 16. Bb5 Rxg2+ 17. Kc1 Bxc3 18. bxc3 a6 19. Qf1 Rg6 20. Bxd7+ Bxd7 21. e5 Bg4 22. exd6 Qxd6 23. Qe1+ Kf8 24. Ne5 Rg7 25. Nc4 Qf6 26. Nb6 Re8 27. Qd2 Kg8 28. Ra4 Re2 29. Qxf4 Qxf4+ 30. Rxf4 Bh3 31. Rf3 Bg2 32. d6 Bxh1 33. d7 Rg1+ 34. Kb2 Rd1 35. Rg3+ Kf8 36. Rg1 Red2 0-1

[Event "Corus reserve op"]
[Site "Wijk aan Zee"]
[Date "2001.01.16"]
[Round "1"]
[White "De Haas, Piet"]
[Black "Hartoch, Robert G"]
[Result "0-1"]
[ECO "B08"]
[BlackElo "2319"]
[PlyCount "80"]
[EventDate "2001.01.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 080 Extra"]
[Source "ChessBase"]
[SourceDate "2001.03.08"]
[SourceVersion "1"]
[SourceVersionDate "2001.03.08"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Nf3 d6 5. Be2 Nd7 6. 0-0 Qc7 7. a4 Ngf6 8. h3 0-0 9. Be3 b6 10. Qd2 Bb7 11. Rfd1 a6 12. Ne1 Rfd8 13. f4 e5 14. Nf3 exd4 15. Nxd4 c5 16. Nf3 Nxe4 17. Nxe4 Bxe4 18. Ng5 Nf6 19. Nxe4 Nxe4 20. Qd3 d5 21. c3 f5 22. Bf3 Kh8 23. Qc2 Qc6 24. Kh2 Rd7 25. Rd3 Rad8 26. Re1 Bf6 27. Bc1 Bh4 28. Rf1 b5 29. axb5 axb5 30. Bd1 Bf6 31. Bf3 Qa6 32. Rdd1 Qb7 33. g3 d4 34. cxd4 cxd4 35. Qb3 Qb6 36. Bd2 d3 37. Qb4 Rd4 38. Qb3 Rc4 39. Kg2 Rc2 40. Qb4 Rxb2 0-1

[Event "Utrecht op"]
[Site "Utrecht"]
[Date "1998.06.05"]
[Round "?"]
[White "Breuker, Dennis Michel"]
[Black "De Haas, Piet"]
[Result "1/2-1/2"]
[ECO "A65"]
[PlyCount "78"]
[EventDate "1998.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3 0-0 6. Bg5 c5 7. d5 e6 8. Bd3 exd5 9. cxd5 Re8 10. Nf3 a6 11. a4 h6 12. Be3 Nbd7 13. Qd2 Kh7 14. 0-0 Rb8 15. Qc2 Qc7 16. Nd2 Ne5 17. Be2 g5 18. f4 gxf4 19. Bxf4 Ng6 20. Bh2 Bd7 21. Nc4 Ne5 22. Bxe5 dxe5 23. a5 Qd8 24. Rf2 Qe7 25. Raf1 Rg8 26. Nd1 Rbf8 27. Nde3 Ne8 28. Qb3 Bc8 29. Qb6 Bh8 30. Bh5 Rg7 31. Rxf7 Rfxf7 32. Rxf7 Qg5 33. Rxg7+ Nxg7 34. Bg4 Bxg4 35. hxg4 Qh4 36. d6 Qe1+ 37. Kh2 Qh4+ 38. Kg1 Qe1+ 39. Kh2 Qh4+ 1/2-1/2

[Event "Utrecht op"]
[Site "Utrecht"]
[Date "1998.06.05"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Oosterom, Erik"]
[Result "0-1"]
[ECO "B01"]
[BlackElo "2290"]
[PlyCount "62"]
[EventDate "1998.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Nf6 3. d4 Nxd5 4. Nf3 Bg4 5. Be2 e6 6. c4 Nb6 7. 0-0 Be7 8. Be3 0-0 9. Nbd2 N8d7 10. Rc1 c5 11. Nb3 Qc7 12. Qc2 Rad8 13. Rfd1 a6 14. dxc5 Nxc5 15. Nxc5 Bxc5 16. Bxc5 Qxc5 17. Qe4 Bf5 18. Qxb7 Rb8 19. Qxa6 Ra8 20. Qb5 Qxb5 21. cxb5 Rxa2 22. Rd6 Rxb2 23. Nd4 Nc8 24. Rdc6 Ne7 25. R6c5 Be4 26. Bf1 h6 27. Nc6 Nd5 28. Re1 Bh7 29. Ne5 Rb8 30. Rec1 g5 31. Ra1 Rb7 0-1

[Event "Soest op"]
[Site "Soest"]
[Date "1998.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Bloemhard, Rudy"]
[Result "1-0"]
[ECO "C67"]
[PlyCount "132"]
[EventDate "1998.06.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. 0-0 Nxe4 5. d4 Nd6 6. Bxc6 dxc6 7. dxe5 Nf5 8. Qxd8+ Kxd8 9. Rd1+ Ke8 10. Nc3 Ne7 11. Ne4 Ng6 12. h3 Bf5 13. Re1 Rd8 14. Bg5 Be7 15. Bxe7 Kxe7 16. c3 Rd5 17. c4 Rdd8 18. Ng3 Be6 19. Rad1 Rxd1 20. Rxd1 h5 21. b3 h4 22. Nf1 Rh5 23. Re1 c5 24. N1d2 b6 25. Nb1 Bf5 26. Nc3 c6 27. Re3 Nf4 28. Ne4 Bxe4 29. Rxe4 Ng6 30. Kf1 Ke6 31. Ke2 a6 32. Kd3 b5 33. Ke3 a5 34. Ke2 Rh8 35. Ke3 b4 36. Ng5+ Ke7 37. f4 Ra8 38. Kf3 a4 39. Re3 axb3 40. axb3 Ra1 41. Ne4 Rf1+ 42. Ke2 Rxf4 43. Nxc5 Rf5 44. Nd3 Nf4+ 45. Nxf4 Rxf4 46. Rf3 Re4+ 47. Re3 Rxe3+ 48. Kxe3 Ke6 49. Kd4 g5 50. Kc5 Kxe5 51. Kxc6 f5 52. Kb6 g4 53. c5 gxh3 54. gxh3 f4 55. c6 f3 56. c7 f2 57. c8Q f1Q 58. Qc5+ Ke4 59. Qxb4+ Ke3 60. Qxh4 Qf7 61. Qe1+ Kd3 62. Qb4 Qe6+ 63. Ka5 Qc8 64. Qd6+ Ke3 65. b4 Qxh3 66. b5 Qh4 1-0

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "3"]
[White "De Haas, Piet"]
[Black "Horvath, Tamas1111"]
[Result "1/2-1/2"]
[ECO "B45"]
[BlackElo "2385"]
[PlyCount "47"]
[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. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 d6 7. Bf4 e5 8. Nd5 Nxd5 9. exd5 exf4 10. dxc6 bxc6 11. Qf3 Qb6 12. Qxf4 Rb8 13. Nxd6+ Bxd6 14. Qxd6 Qxb2 15. Rd1 Qc3+ 16. Qd2 Qe5+ 17. Be2 0-0 18. 0-0 Be6 19. Bf3 Rb6 20. a4 Qc5 21. Be4 Rb4 22. Bxc6 Rc4 23. Bb5 Rxc2 24. Qd4 1/2-1/2

[Event "Soest op"]
[Site "Soest"]
[Date "1998.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Los, Arend"]
[Result "1-0"]
[ECO "C09"]
[PlyCount "127"]
[EventDate "1998.06.??"]
[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. Nd2 c5 4. exd5 exd5 5. Ngf3 Nc6 6. Bb5 Bd6 7. 0-0 Nge7 8. dxc5 Bxc5 9. Nb3 Bd6 10. Nbd4 0-0 11. Be3 a6 12. Bd3 Ng6 13. c3 Nce5 14. Bf5 Nxf3+ 15. Qxf3 Nh4 16. Qh3 Nxf5 17. Nxf5 Qf6 18. g4 Bxf5 19. gxf5 Rfe8 20. f4 Rac8 21. Kh1 Bc5 22. Bxc5 Rxc5 23. Rae1 Re4 24. Rxe4 dxe4 25. Re1 Qd8 26. Qe3 Qd5 27. Qxe4 Kf8 28. f6 gxf6 29. Kg2 Rb5 30. Qxd5 Rxd5 31. Kf3 a5 32. c4 Rd2 33. Re2 Rd1 34. b3 Rc1 35. Ke4 a4 36. Kf5 a3 37. Kxf6 Rf1 38. f5 Rf3 39. h4 Rf1 40. h5 Rh1 41. Re7 Rxh5 42. Rxf7+ Ke8 43. Rxb7 Rh2 44. Ra7 Rxa2 45. Rxh7 Ra1 46. Ra7 a2 47. c5 Kd8 48. c6 Rc1 49. Rxa2 Rxc6+ 50. Kg5 Rc3 51. Rb2 Ke7 52. b4 Rg3+ 53. Kf4 Rg1 54. Re2+ Kf6 55. Re6+ Kf7 56. b5 Rf1+ 57. Ke5 Re1+ 58. Kd6 Rb1 59. Kc6 Rc1+ 60. Kb7 Rf1 61. Re5 Kf6 62. Rc5 Rh1 63. b6 Rh7+ 64. Ka6 1-0

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "5"]
[White "De Haas, Piet"]
[Black "Maas, Joop"]
[Result "1-0"]
[ECO "B17"]
[PlyCount "74"]
[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 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Bc4 Ngf6 6. Ng5 e6 7. Qe2 Nb6 8. Bb3 h6 9. N5f3 Qc7 10. c3 c5 11. Nh3 Bd6 12. dxc5 Bxc5 13. 0-0 Bd6 14. g3 0-0 15. Nf4 e5 16. Ng2 Bg4 17. Ne3 Bh5 18. Nf5 e4 19. Qd2 exf3 20. Qxd6 Qxd6 21. Nxd6 Rad8 22. Nxb7 Rb8 23. Nd6 Rbd8 24. Nf5 Bg4 25. Nd4 Rfe8 26. a4 Nbd7 27. Bf4 g5 28. Be3 Nc5 29. Bc4 Rxe3 30. fxe3 Nce4 31. Nxf3 Bh3 32. Rfd1 Re8 33. Rd4 g4 34. Nh4 Ng5 35. Re1 Nfe4 36. Bd5 Nc5 37. b4 Nxa4 1-0

[Event "Soest op"]
[Site "Soest"]
[Date "1998.??.??"]
[Round "?"]
[White "Homs, Guust"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C78"]
[PlyCount "49"]
[EventDate "1998.06.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Bb7 7. d4 Nxd4 8. Bxf7+ Kxf7 9. Nxe5+ Kg8 10. Qxd4 c5 11. Qd1 Qe7 12. Bf4 d6 13. Nf3 Qxe4 14. Bg3 g5 15. a4 b4 16. Nbd2 Qg6 17. Re1 Rd8 18. c3 bxc3 19. bxc3 h6 20. Rb1 Rh7 21. Nc4 Kh8 22. Nfe5 Qg8 23. Ne3 Ne4 24. Qd3 Nxg3 25. Ng6+ 1-0

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "4"]
[White "Jonkman, Harmen"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C31"]
[WhiteElo "2315"]
[PlyCount "79"]
[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 e5 2. f4 d5 3. exd5 c6 4. Nc3 exf4 5. Nf3 Bd6 6. d4 Ne7 7. dxc6 Nbxc6 8. Bc4 0-0 9. 0-0 Bg4 10. Ne4 Bc7 11. c3 Ng6 12. Nf2 Bh5 13. Qd3 Nh4 14. Nxh4 Qxh4 15. Qh3 Qg5 16. Ne4 Qg6 17. Bxf4 Bg4 18. Qg3 Qxe4 19. Rae1 Bxf4 20. Rxf4 Qc2 21. Rxg4 g6 22. Qf2 Qxf2+ 23. Kxf2 Kg7 24. Rg5 f6 25. Rb5 b6 26. Rd5 Rf7 27. Rd6 Rc7 28. Rxc6 Rxc6 29. Bd5 Rcc8 30. Bxa8 Rxa8 31. Re7+ Kh6 32. Rf7 f5 33. a4 a5 34. Rb7 Rc8 35. Rxb6 Rc4 36. Rb3 Rxa4 37. Ra3 Rxa3 38. bxa3 g5 39. h4 Kg6 40. hxg5 1-0

[Event "Soest op"]
[Site "Soest"]
[Date "1998.??.??"]
[Round "?"]
[White "Spanjersberg, Hans"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "A03"]
[PlyCount "62"]
[EventDate "1998.06.??"]
[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. Nf3 c5 3. e3 Nc6 4. Bb5 g6 5. 0-0 Bg7 6. d4 cxd4 7. exd4 Qb6 8. Bxc6+ bxc6 9. c3 Nf6 10. Re1 e6 11. Nbd2 0-0 12. Nb3 a5 13. Nc5 Nd7 14. Nxd7 Bxd7 15. Ne5 Bc8 16. Qc2 Ra7 17. Be3 Ba6 18. Nd3 Bxd3 19. Qxd3 Qxb2 20. Reb1 Qa3 21. Rb6 Rc8 22. Qc2 Qe7 23. Qa4 c5 24. Rab1 cxd4 25. cxd4 h5 26. Qd1 Rc4 27. Rb8+ Kh7 28. g4 Qh4 29. gxh5 Qxh5 30. Qxh5+ gxh5 31. Rd1 Rc2 0-1

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "1"]
[White "Van Run, Jan"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "A01"]
[PlyCount "117"]
[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. b3 e5 2. Bb2 Nc6 3. e3 d6 4. Nf3 Nf6 5. d4 e4 6. Nfd2 Bf5 7. c4 Qe7 8. Be2 h5 9. Nc3 g6 10. Qb1 Bg7 11. d5 Nb4 12. 0-0 0-0 13. a3 Nd3 14. Bxd3 exd3 15. Re1 Ng4 16. e4 Qh4 17. Nf3 Qxf2+ 18. Kh1 Qb6 19. Nd1 d2 20. Nxd2 Rfe8 21. Bxg7 Kxg7 22. Qb2+ Kg8 23. h3 Ne5 24. Qc3 Bd7 25. Nf3 Re7 26. Nxe5 Rxe5 27. Qe3 Rae8 28. Nf2 Bf5 29. Qf3 Bd7 30. Qe3 Qxe3 31. Rxe3 Kg7 32. Rae1 f5 33. Kg1 R8e7 34. Kf1 Be8 35. R3e2 Kf6 36. exf5 Kxf5 37. g3 g5 38. g4+ hxg4 39. hxg4+ Kf6 40. Nd3 Rxe2 41. Rxe2 Bg6 42. Ne1 Rxe2 43. Kxe2 Ke5 44. Ke3 Be4 45. b4 b5 46. cxb5 Kxd5 47. Nd3 Bxd3 48. Kxd3 Ke5 49. Ke3 d5 50. Kd3 d4 51. a4 Kd5 52. a5 Ke5 53. Ke2 Ke4 54. Kd2 d3 55. Ke1 Ke3 56. Kd1 d2 57. a6 Kd3 58. b6 cxb6 59. b5 0-1

[Event "Haarlem AKN op 07th"]
[Site "Haarlem"]
[Date "1998.??.??"]
[Round "6"]
[White "Vigus, James"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "E97"]
[WhiteElo "2260"]
[PlyCount "116"]
[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. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. d4 0-0 6. Be2 e5 7. 0-0 Nc6 8. d5 Ne7 9. b4 Nh5 10. Re1 Nf4 11. Bf1 a5 12. Ba3 Bg4 13. Re3 axb4 14. Bxb4 c5 15. dxc6 Nxc6 16. Qxd6 Bxf3 17. Rxf3 Nd4 18. Rg3 Qc8 19. c5 Re8 20. Nd5 Bf8 21. Qc7 Nfe2+ 22. Bxe2 Nxe2+ 23. Kf1 Nxg3+ 24. hxg3 Re6 25. a3 Rb8 26. Qa5 Qc6 27. Rd1 Kh8 28. f3 Qd7 29. Ne3 Qe8 30. Bc3 Rc8 31. Rd5 f6 32. Nc4 Ra6 33. Qb4 Qa4 34. Nb6 Qxb4 35. Bxb4 Rc6 36. Nd7 Ra8 37. Nxf8 Rxf8 38. Rd7 Rb8 39. Ke2 b6 40. Rd6 Rxd6 41. cxd6 Kg8 42. d7 Kf7 43. Bd6 Rd8 44. Bc7 Rxd7 45. Bxb6 Rb7 46. Bc5 Rb2+ 47. Kf1 Ra2 48. g4 Ke6 49. Kg1 f5 50. gxf5+ gxf5 51. exf5+ Kxf5 52. Kh2 Kf4 53. Bd6 Rc2 54. Kh3 Rc6 55. Bf8 Rg6 56. Kh2 e4 57. fxe4 Kxe4 58. Bb4 Ke3 0-1

[Event "Dieren op"]
[Site "Dieren"]
[Date "1997.??.??"]
[Round "2"]
[White "De Haas, Piet"]
[Black "Brouwer, Jaap"]
[Result "1/2-1/2"]
[ECO "C18"]
[PlyCount "81"]
[EventDate "1997.07.??"]
[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 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Ba5 6. Bd2 Ne7 7. Nb5 Bxd2+ 8. Qxd2 0-0 9. f4 a6 10. Nd6 cxd4 11. Nf3 Nbc6 12. Bd3 f6 13. 0-0 Nf5 14. Nxf5 exf5 15. Rae1 Be6 16. Qf2 Qb6 17. b3 Rae8 18. Qh4 Qd8 19. Qf2 Bc8 20. exf6 Qxf6 21. Rxe8 Rxe8 22. Re1 Re6 23. Rxe6 Bxe6 24. Qe1 Bf7 25. g3 g6 26. Kf2 h6 27. h4 Kf8 28. Qe2 Be8 29. Qe1 Bd7 30. Bf1 Qd6 31. Qa1 Qc5 32. Bd3 Qc3 33. Qxc3 dxc3 34. Ke3 a5 35. Nd4 Ke7 36. Nxc6+ bxc6 37. Kd4 Kd6 38. b4 axb4 39. axb4 h5 40. Be2 Be8 41. Bd3 1/2-1/2

[Event "Haarlem AKN op 06th"]
[Site "Haarlem"]
[Date "1997.??.??"]
[Round "4"]
[White "De Haas, Piet"]
[Black "Pieters, Minko"]
[Result "1-0"]
[ECO "C88"]
[PlyCount "45"]
[EventDate "1997.06.26"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 0-0 8. a4 b4 9. d3 d6 10. Nbd2 Be6 11. c3 Bxb3 12. Qxb3 bxc3 13. Qxc3 Qd7 14. Nc4 Nh5 15. Ne3 h6 16. Nd5 Bd8 17. Bd2 Ne7 18. Nxe7+ Bxe7 19. d4 f6 20. Nh4 g5 21. Nf5 Kh7 22. Qh3 Qe8 23. g4 1-0

[Event "Haarlem AKN op 06th"]
[Site "Haarlem"]
[Date "1997.??.??"]
[Round "6"]
[White "De Haas, Piet"]
[Black "Plug, Arjan JH"]
[Result "1-0"]
[ECO "B00"]
[WhiteElo "1990"]
[BlackElo "1765"]
[PlyCount "81"]
[EventDate "1997.06.26"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 Nc6 2. Nf3 d6 3. d4 Nf6 4. Nc3 Bg4 5. d5 Nb8 6. Be3 g6 7. Qd3 c5 8. Nd2 a6 9. a4 Bg7 10. f4 Bc8 11. a5 0-0 12. Nc4 Nfd7 13. Be2 b5 14. axb6 Nxb6 15. Na5 Bd7 16. 0-0 Qc7 17. g4 c4 18. Qd2 Bb5 19. Bd4 N8d7 20. Kg2 e5 21. Bxb6 Nxb6 22. f5 f6 23. Kf3 Kf7 24. h4 Ke7 25. Ra2 Qc5 26. Rfa1 gxf5 27. gxf5 Be8 28. Qe3 Qxe3+ 29. Kxe3 Bh6+ 30. Kf2 Rg8 31. Nxc4 Nxc4 32. Bxc4 Bh5 33. Rxa6 Rxa6 34. Rxa6 Rg4 35. Ra7+ Kf8 36. Rxh7 Rf4+ 37. Ke1 Rxh4 38. Rxh6 Rh1+ 39. Kd2 Kg7 40. Rxh5 Rxh5 41. Nb5 1-0

[Event "Haarlem AKN op 06th"]
[Site "Haarlem"]
[Date "1997.??.??"]
[Round "1"]
[White "De Haas, Piet"]
[Black "Pouw, Pieter"]
[Result "1-0"]
[ECO "C78"]
[WhiteElo "1990"]
[BlackElo "1745"]
[PlyCount "117"]
[EventDate "1997.06.26"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Be7 7. Bd5 Nxd5 8. exd5 e4 9. dxc6 exf3 10. Qxf3 0-0 11. Nc3 dxc6 12. Qxc6 Bd7 13. Qf3 Bd6 14. d3 Qh4 15. h3 Rae8 16. Bd2 Re6 17. Ne4 Rg6 18. Nxd6 cxd6 19. Kh2 Rc8 20. Rae1 h6 21. Re4 Qd8 22. Qd1 d5 23. Rf4 Qc7 24. c3 d4 25. g3 dxc3 26. Bxc3 Qd6 27. Re1 Bc6 28. Qb3 Bd5 29. Qb4 Qxb4 30. Bxb4 Bxa2 31. d4 Re6 32. Rxe6 Bxe6 33. Bc5 f6 34. Re4 Kf7 35. Re3 Rc7 36. h4 Rc8 37. Kg1 a5 38. Kf1 a4 39. Ke1 Rc7 40. Kd2 Bc4 41. Kc3 f5 42. Kb4 Kf6 43. Re8 Rd7 44. f4 Kf7 45. Re3 g6 46. Ka5 Kf6 47. Kb6 g5 48. Kc6 gxf4 49. gxf4 Rf7 50. d5 b4 51. Bxb4 Ba6 52. Re6+ Kg7 53. d6 Bb7+ 54. Kb5 Bc8 55. Re3 Bd7+ 56. Kb6 h5 57. Kc7 Bb5+ 58. Kb6 Bd7 59. Kc5 1-0

[Event "Haarlem AKN op 06th"]
[Site "Haarlem"]
[Date "1997.??.??"]
[Round "3"]
[White "Movsziszian, Karen"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "E81"]
[WhiteElo "2490"]
[BlackElo "1990"]
[PlyCount "67"]
[EventDate "1997.06.26"]
[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 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 c6 7. Qd2 a6 8. h4 e5 9. dxe5 dxe5 10. Qxd8 Rxd8 11. Na4 Nbd7 12. Rd1 Re8 13. c5 Rb8 14. g4 Nf8 15. h5 N6d7 16. Bc4 Ne6 17. Ne2 Bf8 18. Bxe6 Rxe6 19. Nc1 Re8 20. Nb3 Be7 21. Na5 Bd8 22. Nc4 Bc7 23. hxg6 hxg6 24. Rd2 Nf8 25. Bg5 Kg7 26. Rdh2 Be6 27. Nd6 Bxd6 28. cxd6 b6 29. Bh6+ Kg8 30. g5 Nh7 31. Bg7 Nxg5 32. Bf6 Nxf3+ 33. Kf2 Nxh2 34. Rxh2 1-0

[Event "Haarlem AKN op 06th"]
[Site "Haarlem"]
[Date "1997.??.??"]
[Round "5"]
[White "Van Beek, Lucien"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "E74"]
[WhiteElo "2230"]
[PlyCount "45"]
[EventDate "1997.06.26"]
[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 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Bg5 c5 7. dxc5 dxc5 8. Qxd8 Rxd8 9. e5 Nfd7 10. Nd5 Nc6 11. f4 f6 12. Bh4 fxe5 13. 0-0-0 Bf6 14. Nxf6+ exf6 15. fxe5 Nd4 16. exf6 Kf7 17. Bf2 Nxe2+ 18. Nxe2 b6 19. Bg3 Re8 20. Nc3 Nxf6 21. Rhf1 Bb7 22. Bh4 Re6 23. Rd7+ 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "1997.??.??"]
[Round "1"]
[White "Van Wessel, Rudy"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C31"]
[WhiteElo "2315"]
[PlyCount "141"]
[EventDate "1997.07.??"]
[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 e5 2. f4 d5 3. exd5 c6 4. Nc3 exf4 5. Nf3 Bd6 6. d4 Ne7 7. dxc6 Nbxc6 8. Bc4 0-0 9. 0-0 Bg4 10. Ne4 Bc7 11. c3 Rc8 12. Nc5 Nf5 13. Nxb7 Qf6 14. Nc5 Rfe8 15. Bd5 Rcd8 16. Bxc6 Qxc6 17. Nd3 Qh6 18. Qc2 Bxf3 19. Rxf3 g5 20. Bd2 Re2 21. Rh3 Qg6 22. Re1 Rde8 23. Rxe2 Rxe2 24. Qd1 Qe6 25. Nc5 Qe7 26. Kf1 Re3 27. Qh5 Rxh3 28. Qxh3 Ne3+ 29. Bxe3 fxe3 30. Ke2 Bf4 31. g3 Bd6 32. Qf5 Bxc5 33. dxc5 h6 34. b4 Qb7 35. Kxe3 Qg2 36. Qf2 Qd5 37. Qd2 Qe5+ 38. Kf2 Qf5+ 39. Kg1 Qb1+ 40. Kg2 Qe4+ 41. Kf2 Qf5+ 42. Ke2 Qe4+ 43. Qe3 Qc2+ 44. Kf3 Qxh2 45. Ke4 Qxa2 46. Kd4 Qa4 47. Qf3 Qd7+ 48. Kc4 Kf8 49. b5 Qe6+ 50. Kb4 Qa2 51. b6 Qb2+ 52. Ka5 axb6+ 53. cxb6 Qa3+ 54. Kb5 Qb3+ 55. Kc5 Qa3+ 56. Kc6 Qa4+ 57. Kc7 Qa5 58. Qe3 h5 59. Qd4 Kg8 60. c4 h4 61. gxh4 gxh4 62. Qxh4 Qe5+ 63. Kb7 f6 64. Qg4+ Kf7 65. Qd7+ Kg6 66. Qc7 Qe4+ 67. Ka7 Qd4 68. c5 Qa4+ 69. Kb8 f5 70. Qd6+ Kg5 71. c6 1-0

[Event "Haarlem AKN op 03rd"]
[Site "Haarlem"]
[Date "1994.??.??"]
[Round "5"]
[White "Bos, Ivan"]
[Black "De Haas, Piet"]
[Result "1/2-1/2"]
[ECO "A40"]
[PlyCount "64"]
[EventDate "1994.07.??"]
[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. c4 Bg7 3. Nc3 a6 4. e4 Nc6 5. Nf3 e5 6. d5 Nd4 7. Nxd4 exd4 8. Ne2 c5 9. dxc6 dxc6 10. h4 Be6 11. Qd3 Qd6 12. Bd2 Ne7 13. Rc1 f5 14. c5 fxe4 15. cxd6 exd3 16. Nf4 Bxa2 17. dxe7 Kxe7 18. Bxd3 Rac8 19. Bxg6 hxg6 20. Nxg6+ Kf7 21. Nxh8+ Bxh8 22. b4 Bd5 23. 0-0 b6 24. Rfd1 c5 25. bxc5 bxc5 26. Bc3 Rg8 27. Ba1 Bxg2 28. Re1 Be4+ 29. Kf1 Bd3+ 30. Re2 Re8 31. Rce1 Kg6 32. f3 Bf6 1/2-1/2

[Event "Haarlem AKN op 03rd"]
[Site "Haarlem"]
[Date "1994.??.??"]
[Round "6"]
[White "De Haas, Piet"]
[Black "De Weerd, Warner"]
[Result "1/2-1/2"]
[ECO "B85"]
[PlyCount "77"]
[EventDate "1994.07.??"]
[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. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. 0-0 Be7 8. Be3 0-0 9. f4 Nc6 10. Qe1 Nxd4 11. Bxd4 e5 12. Be3 exf4 13. Rxf4 Be6 14. Rd1 Qa5 15. Rf1 Kh8 16. a3 Rad8 17. Bf3 b5 18. Qf2 Rb8 19. Ba7 Rb7 20. e5 Ng4 21. Bxg4 Bxg4 22. exd6 Bd8 23. Rd4 Rxa7 24. Rxg4 Bb6 25. Rd4 Bxd4 26. Qxd4 Rd7 27. Ne4 Qa4 28. Qe5 Qxc2 29. Nc5 Rdd8 30. d7 Qd2 31. h3 Rxd7 32. Nxd7 Qxd7 33. Re1 Kg8 34. Re2 h6 35. Re4 Rd8 36. Rg4 g6 37. Qe3 Qd2 38. Rxg6+ fxg6 39. Qe6+ 1/2-1/2

[Event "Haarlem AKN op 03rd"]
[Site "Haarlem"]
[Date "1994.??.??"]
[Round "1"]
[White "De Haas, Piet"]
[Black "O'Mahony, Cian"]
[Result "1/2-1/2"]
[ECO "C83"]
[PlyCount "83"]
[EventDate "1994.07.??"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2 Be7 10. c3 0-0 11. Qe2 Nc5 12. Bc2 d4 13. cxd4 Nxd4 14. Nxd4 Qxd4 15. Re1 Rad8 16. Nf3 Qc4 17. b3 Qxe2 18. Rxe2 Bg4 19. Be3 Ne6 20. Ree1 Bxf3 21. gxf3 b4 22. f4 c5 23. f5 Nd4 24. Be4 f6 25. e6 Kh8 26. Rac1 g6 27. fxg6 f5 28. g7+ Kxg7 29. Bb7 Rf6 30. Bxd4 Rxd4 31. Bxa6 Rg6+ 32. Kh1 Kf6 33. Re2 Rgg4 34. f3 Rh4 35. Bc4 Rd8 36. Ra1 Rhd4 37. Kg2 Rg8+ 38. Kh1 Rgd8 39. Rae1 Rd1 40. Kg2 Rxe1 41. Rxe1 Rd2+ 42. Re2 1/2-1/2

[Event "Haarlem AKN op 03rd"]
[Site "Haarlem"]
[Date "1994.??.??"]
[Round "3"]
[White "De Haas, Piet"]
[Black "Woestenburg, Jochem"]
[Result "1/2-1/2"]
[ECO "C85"]
[PlyCount "91"]
[EventDate "1994.07.??"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Bxc6 dxc6 7. d3 Bg4 8. Nbd2 0-0 9. h3 Bxf3 10. Qxf3 Nd7 11. Nc4 Bg5 12. Ne3 Nc5 13. Rd1 Ne6 14. c3 c5 15. g3 c6 16. Kg2 g6 17. Qe2 Bxe3 18. Bxe3 f5 19. exf5 Qd5+ 20. Kh2 Rxf5 21. Rf1 Raf8 22. c4 Qd7 23. Kg2 Nf4+ 24. Bxf4 exf4 25. gxf4 Qd6 26. Qe3 Rxf4 27. Rae1 Rd4 28. Qe6+ Qxe6 29. Rxe6 Rxd3 30. Re7 Rf7 31. Rfe1 Rd2 32. R7e2 Rxe2 33. Rxe2 Rd7 34. b3 Kf7 35. Kg3 Rd3+ 36. f3 b5 37. Rc2 b4 38. Re2 Kf6 39. Re8 Rd2 40. Rc8 Rxa2 41. Rxc6+ Kg7 42. Rxc5 a5 43. Rc6 Rb2 44. Ra6 Rxb3 45. Rxa5 Rc3 46. c5 1/2-1/2

[Event "Haarlem AKN op 03rd"]
[Site "Haarlem"]
[Date "1994.??.??"]
[Round "4"]
[White "Kloppers, Erik"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "D02"]
[PlyCount "108"]
[EventDate "1994.07.??"]
[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. Nf3 e6 3. Bf4 c5 4. e3 Qb6 5. Qc1 Nc6 6. c3 d5 7. Bd3 cxd4 8. exd4 Bd7 9. Nbd2 Rc8 10. Qb1 Na5 11. 0-0 Bb5 12. Bxb5+ Qxb5 13. Re1 Nc4 14. Nxc4 Rxc4 15. h3 Be7 16. Ne5 Rc8 17. Re3 Ne4 18. Qc2 Nd6 19. Qe2 Qxe2 20. Rxe2 0-0 21. Nd7 Rfd8 22. Bxd6 Bxd6 23. Ne5 b5 24. a3 a5 25. Nd3 Rc4 26. Ne5 Rc7 27. Nd3 Rdc8 28. Rd1 Kf8 29. g3 Rb7 30. Rdd2 Rc4 31. Ne5 Bxe5 32. dxe5 b4 33. axb4 axb4 34. Re3 bxc3 35. bxc3 Rb3 36. Rdd3 g5 37. g4 Kg7 38. Kg2 Ra3 39. Rf3 Re4 40. Rde3 Raa4 41. Kf1 Rf4 42. Ke2 Ra2+ 43. Kf1 Kg6 44. Kg2 Raa4 45. Kg3 h5 46. gxh5+ Kxh5 47. Kg2 Kg6 48. Rd3 Kf5 49. Rfe3 Rae4 50. Rxe4 Rxe4 51. Rf3+ Kg6 52. Rf6+ Kg7 53. Rf3 Rxe5 54. Kg3 Re4 0-1

[Event "Haarlem AKN op 03rd"]
[Site "Haarlem"]
[Date "1994.??.??"]
[Round "2"]
[White "Lokotar, Erkki"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "A52"]
[WhiteElo "2330"]
[PlyCount "89"]
[EventDate "1994.07.??"]
[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 e5 3. dxe5 Ng4 4. Bf4 Bb4+ 5. Nc3 Nc6 6. Nf3 Qe7 7. Qd5 Bxc3+ 8. bxc3 f6 9. exf6 Nxf6 10. Qd3 d6 11. e3 0-0 12. Bg5 Qf7 13. Be2 Be6 14. Bxf6 Qxf6 15. 0-0 Kh8 16. Nd2 b6 17. f4 Rae8 18. Rae1 Na5 19. Bf3 Re7 20. g3 Rfe8 21. Re2 Bg8 22. Bd5 h6 23. Bxg8 Kxg8 24. e4 Kh8 25. Rfe1 Nb7 26. Nb3 a5 27. Re3 Qg6 28. Qd5 Nd8 29. Nd4 Qf6 30. Nf3 Ne6 31. e5 dxe5 32. Nxe5 g6 33. Ng4 Qf7 34. Nxh6 Qf6 35. Ng4 Qf7 36. Nh6 Qf6 37. Qe5 Kg7 38. Qxf6+ Kxf6 39. Ng4+ Kf7 40. Ne5+ Kf6 41. Kg2 Nc5 42. Kf3 Re6 43. Rd1 Kg7 44. h4 Rf8 45. Ng4 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1987.??.??"]
[Round "5"]
[White "De Bruijn, Aad"]
[Black "De Haas, Piet"]
[Result "1/2-1/2"]
[ECO "C29"]
[PlyCount "135"]
[EventDate "1987.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Be7 6. d3 Nxc3 7. bxc3 c5 8. Be2 Nc6 9. 0-0 d4 10. Qe1 0-0 11. Qg3 f6 12. Bh6 Rf7 13. exf6 Bxf6 14. Ng5 Rf8 15. Ne4 Be5 16. Bf4 Bxf4 17. Rxf4 Rxf4 18. Qxf4 dxc3 19. Rf1 Be6 20. Nxc3 Qd4+ 21. Qxd4 Nxd4 22. Bf3 Rb8 23. Bd1 Rc8 24. Bf3 b5 25. Bd5 Bxd5 26. Nxd5 Re8 27. c3 Ne6 28. Re1 Kf7 29. Rf1+ Kg8 30. Re1 Nc7 31. Rxe8+ Nxe8 32. Ne7+ Kf7 33. Nc6 a6 34. Kf2 Ke6 35. Kf3 Kd5 36. Ne7+ Ke6 37. Nc6 Nd6 38. g4 Nb7 39. Ke4 a5 40. d4 Kd6 41. Ne5 c4 42. a4 bxa4 43. Nxc4+ Kc6 44. Na3 Nd6+ 45. Ke5 Nb5 46. d5+ Kc5 47. Nxb5 Kxb5 48. d6 a3 49. d7 a2 50. d8Q a1Q 51. Qd5+ Ka4 52. Qd4+ Kb3 53. Qd5+ Kc2 54. Qe4+ Kb2 55. Qe3 Qa3 56. Qd2+ Kb3 57. Qd4 Qe7+ 58. Kd5 Qd7+ 59. Kc5 Qc7+ 60. Kb5 Qxc3 61. Qd5+ Kc2 62. Qg2+ Kd3 63. Qf3+ Kd4 64. Qf4+ Kd5 65. Qf5+ Qe5 66. Qxh7 Ke6+ 67. Ka4 Kf6 68. h3 1/2-1/2

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1987.??.??"]
[Round "7"]
[White "De Geus, Gerard"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "E88"]
[PlyCount "89"]
[EventDate "1987.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[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. f3 0-0 6. Be3 c6 7. Bd3 e5 8. Nge2 Nbd7 9. 0-0 Ne8 10. d5 c5 11. Qd2 a6 12. Bh6 Qe7 13. a3 f6 14. Bxg7 Nxg7 15. b4 h6 16. Rab1 Rb8 17. Rb3 h5 18. Rfb1 Kh7 19. bxc5 Nxc5 20. Rb4 Qc7 21. Kh1 Bd7 22. f4 Rfc8 23. Rf1 Rf8 24. Rbb1 Qd8 25. Qe3 Qe7 26. Rb2 Rfe8 27. Rfb1 Qd8 28. Nc1 f5 29. N1e2 exf4 30. Nxf4 fxe4 31. Be2 Nf5 32. Qh3 h4 33. Bg4 Qg5 34. Ne6 Bxe6 35. dxe6 Rxe6 36. Nd5 Nd3 37. Ra2 e3 38. Bxf5 gxf5 39. Qf3 Nf2+ 40. Kg1 h3 41. Nf4 Re5 42. Nxh3 Nxh3+ 43. Qxh3+ Kg7 44. Qf3 f4 45. Re2 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1987.??.??"]
[Round "3"]
[White "De Haas, Piet"]
[Black "Bierenbroodspot, Paul"]
[Result "1/2-1/2"]
[ECO "C90"]
[BlackElo "2260"]
[PlyCount "83"]
[EventDate "1987.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. 0-0 b5 6. Bb3 Nf6 7. Re1 Be7 8. c3 Bg4 9. d3 0-0 10. Nbd2 Na5 11. Bc2 h6 12. Nf1 Nh7 13. h3 Bh5 14. g4 Bg6 15. Ng3 Ng5 16. Kh2 c5 17. Rg1 Ne6 18. Nf5 Bg5 19. Nxg5 hxg5 20. Be3 Nf4 21. Kg3 Qc7 22. Rh1 f6 23. h4 Rfd8 24. hxg5 fxg5 25. b4 Nb7 26. Rh2 Kf7 27. Qd2 Rh8 28. Rah1 Rxh2 29. Rxh2 a5 30. f3 Kf6 31. Bb1 Rd8 32. Qb2 Qb8 33. a3 Rh8 34. Qd2 axb4 35. cxb4 cxb4 36. axb4 Qa8 37. Qb2 Bf7 38. d4 Bc4 39. Nxd6 Nxd6 40. dxe5+ Ke6 41. exd6 Rxh2 42. Qxh2 1/2-1/2

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1987.??.??"]
[Round "6"]
[White "De Haas, Piet"]
[Black "Smorenberg, Jeroen"]
[Result "1-0"]
[ECO "B80"]
[PlyCount "89"]
[EventDate "1987.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[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. f3 Qc7 7. Be3 e6 8. Qd2 Be7 9. 0-0-0 Nc6 10. Kb1 0-0 11. g4 Nd7 12. f4 b5 13. h4 b4 14. Nce2 Bb7 15. Bg2 Rfb8 16. h5 Nxd4 17. Qxd4 Nf8 18. h6 e5 19. Qd2 g6 20. f5 a5 21. fxg6 fxg6 22. Rdf1 a4 23. Rf2 Bc8 24. Qd5+ Ne6 25. Rhf1 Ra5 26. Qd2 Bd7 27. g5 Rf8 28. Ng3 Qd8 29. Rxf8+ Bxf8 30. Qf2 Qe7 31. Bb6 Rb5 32. Be3 b3 33. cxb3 axb3 34. a3 Rb8 35. Ne2 Bb5 36. Re1 Bxe2 37. Qxe2 Nxg5 38. Qd2 Nf7 39. Bf1 Kh8 40. Bc4 Rb7 41. Rf1 Bxh6 42. Bxh6 Qh4 43. Rxf7 Rxf7 44. Bxf7 Qxe4+ 45. Ka1 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1987.??.??"]
[Round "1"]
[White "De Haas, Piet"]
[Black "Spaan, Tigran"]
[Result "1-0"]
[ECO "C88"]
[PlyCount "67"]
[EventDate "1987.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Be7 7. Re1 0-0 8. a4 Bb7 9. d3 Re8 10. c3 Bf8 11. Bg5 g6 12. h3 h6 13. Be3 Na5 14. Bc2 d5 15. Nbd2 c5 16. exd5 Nxd5 17. Ne4 Nxe3 18. Rxe3 f5 19. Ned2 Qf6 20. Qe1 Bd6 21. axb5 axb5 22. d4 cxd4 23. cxd4 Bxf3 24. Nxf3 Nc4 25. Rxa8 Rxa8 26. dxe5 Qd8 27. exd6 Nxe3 28. Qxe3 Qxd6 29. g3 Kh7 30. Qb3 Qd7 31. Bd3 Rb8 32. Bf1 b4 33. Ne5 Qe7 34. Nc6 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1987.??.??"]
[Round "4"]
[White "Hauwert, Nicolaas"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C85"]
[WhiteElo "2220"]
[PlyCount "91"]
[EventDate "1987.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Bxc6 dxc6 7. d3 Nd7 8. Nbd2 f6 9. Nh4 0-0 10. Nf5 Nc5 11. Qg4 Bxf5 12. Qxf5 Qc8 13. b3 Ne6 14. Bb2 Rd8 15. Rae1 Bb4 16. Rd1 Bxd2 17. Rxd2 c5 18. g3 Nd4 19. Qh5 g6 20. Qd1 Qh3 21. f4 Qd7 22. Rdf2 Rf8 23. Bc1 Rae8 24. Be3 b6 25. Qd2 f5 26. exf5 Nxf5 27. fxe5 Nxe3 28. Rxf8+ Rxf8 29. Rxf8+ Kxf8 30. Qxe3 Qe6 31. Qe4 Kf7 32. c3 a5 33. Kf2 Qh3 34. Kg1 Qe6 35. Qc4 Qxc4 36. bxc4 c6 37. Kf2 b5 38. cxb5 cxb5 39. Ke3 b4 40. cxb4 axb4 41. d4 c4 42. d5 Ke7 43. Kd4 c3 44. Kd3 Kd7 45. Kc2 Kc7 46. a3 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1987.??.??"]
[Round "2"]
[White "Vlaming, Jos Pl"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "E90"]
[PlyCount "70"]
[EventDate "1987.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d6 5. e4 0-0 6. Bd3 Bg4 7. h3 Bxf3 8. Qxf3 Nc6 9. Be3 e5 10. d5 Nd4 11. Qd1 Nh5 12. 0-0 Nf4 13. g3 Nxd3 14. Qxd3 Nf3+ 15. Kg2 f5 16. Kxf3 fxe4+ 17. Kxe4 Qf6 18. Bc1 Qf5+ 19. Ke3 e4 20. Nxe4 Rae8 21. f4 Qxh3 22. Rg1 Rxf4 23. Kxf4 Qf5+ 24. Ke3 Bh6+ 25. Ke2 Rxe4+ 26. Kd1 Bg7 27. Qf1 Qg4+ 28. Kc2 Rxc4+ 29. Kb3 Rb4+ 30. Ka3 a5 31. Bf4 Qd7 32. b3 Qf5 33. Qb1 Qxd5 34. Rd1 Qc5 35. Qc1 Rc4+ 0-1

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "2"]
[White "De Geus, Gerard"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C18"]
[PlyCount "67"]
[EventDate "1986.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[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. Nc3 Bb4 4. e5 Ne7 5. a3 Bxc3+ 6. bxc3 c5 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Qd3 Nbc6 11. f4 dxc3 12. Ne2 Bd7 13. Rb1 0-0-0 14. Nxc3 Na5 15. Nb5 Bxb5 16. Qxb5 d4 17. Bd2 Nac6 18. g3 Nd5 19. Bd3 f6 20. exf6 Nxf6 21. Kd1 Ng4 22. Kc1 Rd5 23. Qb3 Nf2 24. Be4 Nxh1 25. Bxd5 Rh8 26. Bxh1 Rxh2 27. Qxe6+ Kd8 28. Bxc6 bxc6 29. Qf6+ Ke8 30. Qe5+ Qxe5 31. fxe5 c5 32. Bf4 c4 33. Rb4 c3 34. Rxd4 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "4"]
[White "De Haas, Piet"]
[Black "Meijer, Willem"]
[Result "1-0"]
[ECO "C18"]
[PlyCount "77"]
[EventDate "1986.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[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. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2 Nbc6 11. f4 Bd7 12. Qd3 dxc3 13. Rb1 0-0-0 14. Nxc3 Na5 15. Be3 b6 16. Nb5 Bxb5 17. Qxb5 Nec6 18. Qa6+ Qb7 19. h4 Kc7 20. Qb5 Rg3 21. Bf2 Rxa3 22. h5 d4 23. h6 Rh8 24. Bd3 Rxd3 25. cxd3 a6 26. Qb2 b5 27. Bxd4 Nxd4 28. Qxd4 Qxg2 29. Rc1+ Nc6 30. Rg1 Qd5 31. Qa7+ Kc8 32. Qxa6+ Kc7 33. Qa7+ Kc8 34. Qa8+ Kc7 35. Qxh8 Qxd3 36. Rxc6+ Kxc6 37. Qc8+ Kb6 38. Qc1 Qe4+ 39. Kf2 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "3"]
[White "De Haas, Piet"]
[Black "Spaan, Tigran"]
[Result "0-1"]
[ECO "C45"]
[PlyCount "44"]
[EventDate "1986.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. e5 Qe7 7. Qe2 Nd5 8. c4 Ba6 9. b3 0-0-0 10. g3 Re8 11. Bb2 f6 12. f4 fxe5 13. fxe5 Qg5 14. Nd2 Ne3 15. Qd3 Bc5 16. Bh3 Re7 17. a3 Qh5 18. Bf1 Nxf1 19. Nxf1 Rxe5+ 20. Kd2 Rd5 21. cxd5 Bxd3 22. Kxd3 Qxd5+ 0-1

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "1"]
[White "Holscher, Peter AC"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "A62"]
[PlyCount "94"]
[EventDate "1986.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[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. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. g3 Bg7 8. Bg2 0-0 9. 0-0 Re8 10. Bf4 a6 11. a4 h6 12. Re1 g5 13. Bd2 Bf5 14. h4 g4 15. Nh2 h5 16. e4 Bg6 17. Bf4 Qb6 18. Re2 Nbd7 19. Nf1 Ne5 20. a5 Qc7 21. Nd2 Nfd7 22. Qa4 b5 23. axb6 Qxb6 24. Nb3 Rec8 25. Na5 Kh7 26. Rd2 Bf6 27. Nc6 Qb7 28. Qa2 Re8 29. Kh1 Qc8 30. Na4 Bg7 31. Bxe5 Bxe5 32. Nxe5 Rxe5 33. Qc4 Qe8 34. Nc3 Qc8 35. f4 gxf3 36. Bh3 Qb7 37. Qf1 Nf6 38. Ra4 Rae8 39. Qxf3 Nxe4 40. Nxe4 Rxe4 41. Rxe4 Rxe4 42. Bf5 Re1+ 43. Kh2 Kg7 44. Bxg6 fxg6 45. Rf2 Qe7 46. Qc3+ Qe5 47. Qb3 Qe7 0-1

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "5"]
[White "Rijnbergen, Michel"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "C24"]
[PlyCount "86"]
[EventDate "1986.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Bc4 Nf6 3. d3 c6 4. Nf3 d5 5. Bb3 Bd6 6. Nc3 Be6 7. Ng5 0-0 8. Qf3 Nbd7 9. exd5 cxd5 10. Bxd5 Nxd5 11. Nxd5 h6 12. h4 Nc5 13. Bd2 Bxd5 14. Qxd5 hxg5 15. hxg5 g6 16. 0-0-0 Kg7 17. g4 Qc7 18. f4 Qc6 19. Qxc6 bxc6 20. f5 Rh8 21. f6+ Kg8 22. Rhe1 Rh4 23. Re3 Rb8 24. b3 Ne6 25. Re4 Rh2 26. Be3 Rb5 27. Ra4 a5 28. c4 Rb8 29. Rxa5 Bb4 30. Rxe5 Ra8 31. a4 Ba3+ 32. Kb1 Rb2+ 33. Ka1 Rxb3 34. Rb1 Rxd3 35. a5 Bd6 36. Re4 Rxa5+ 37. Kb2 Raa3 38. Re1 Rab3+ 39. Ka2 Rb8 40. c5 Nxc5 41. Bxc5 Bxc5 42. Re8+ Rxe8 43. Rxe8+ Bf8 0-1

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "7"]
[White "Roggeveen, Pieter"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C29"]
[PlyCount "69"]
[EventDate "1986.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Nc6 6. Bb5 Nxc3 7. bxc3 Bd7 8. 0-0 Be7 9. d4 0-0 10. Bd3 f6 11. exf6 Bxf6 12. Rb1 b6 13. Ba3 Re8 14. Qd2 Bg4 15. Qf4 Bh5 16. g4 Bg6 17. Bxg6 hxg6 18. Rf2 Re4 19. Qg3 Qd7 20. h3 Rae8 21. Rbf1 Re3 22. Bb2 R8e4 23. Qg2 Qd6 24. Kh1 Qe6 25. Nd2 Na5 26. Nxe4 dxe4 27. Bc1 Rxc3 28. Re2 Bxd4 29. Bb2 Rc4 30. Rxe4 Qd7 31. Rxd4 Rxd4 32. Qf2 Rd2 33. Qf8+ Kh7 34. Qf3 Qd6 35. Rf2 1-0

[Event "Alkmaar ACCOM op-B"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "2"]
[White "De Haas, Piet"]
[Black "Carrion Lara, Luis"]
[Result "0-1"]
[ECO "B12"]
[PlyCount "81"]
[EventDate "1985.??.??"]
[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 c6 2. d4 d5 3. e5 Bf5 4. h4 h6 5. Nc3 e6 6. g4 Bh7 7. Bd3 Bxd3 8. Qxd3 c5 9. Qb5+ Nd7 10. Be3 Qc7 11. dxc5 a6 12. Qa4 Bxc5 13. Nf3 Bxe3 14. fxe3 Rc8 15. Rd1 Qb6 16. Rd4 Qxb2 17. Ne4 Qc1+ 18. Kf2 Qxc2+ 19. Kg3 Qxa4 20. Nd6+ Kf8 21. Rxa4 Rc7 22. Rb1 Nc5 23. Rab4 b5 24. Nd4 g5 25. h5 Ne7 26. Rf1 Nc8 27. Nxc8 Rxc8 28. Rbb1 Ne4+ 29. Kh3 Kg7 30. Rbc1 Nf2+ 31. Kg3 Nd3 32. Rb1 Nxe5 33. a4 Rc3 34. axb5 Rxe3+ 35. Kg2 Re4 36. Nf3 Rxg4+ 37. Kf2 Nxf3 38. Kxf3 Rf4+ 39. Ke2 Rxf1 40. Kxf1 axb5 41. Rxb5 0-1

[Event "Alkmaar ACCOM op-B"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "3"]
[White "Kayser, Eddy"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "D02"]
[PlyCount "44"]
[EventDate "1985.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. Nf3 g6 2. g3 Bg7 3. Bg2 Nc6 4. d4 d5 5. 0-0 Bg4 6. c3 Qd7 7. Re1 0-0-0 8. Nbd2 h5 9. h4 Nf6 10. Ng5 e5 11. Nb3 e4 12. Nc5 Qe7 13. Qa4 Nd7 14. b4 Nb6 15. Qd1 Rde8 16. a4 Bh6 17. Qb3 Bxg5 18. Bxg5 f6 19. Bc1 Bf5 20. b5 Na5 21. Qb4 Nbc4 22. Ba3 g5 0-1

[Event "Alkmaar ACCOM op-B"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "1"]
[White "Ordelman, H."]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "B08"]
[PlyCount "67"]
[EventDate "1985.??.??"]
[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 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 0-0 6. 0-0 c6 7. Bg5 h6 8. Be3 b5 9. b4 a5 10. a3 Nbd7 11. h3 Qc7 12. Qd2 Kh7 13. Bd3 Bb7 14. Nh4 e5 15. d5 Rfc8 16. f3 Qd8 17. g3 cxd5 18. Nxb5 d4 19. Bf2 Qb6 20. bxa5 Qc6 21. Rfb1 Ba6 22. a4 Nc5 23. Rb4 Bf8 24. Rab1 d5 25. Nxd4 exd4 26. Rb6 Nfxe4 27. fxe4 Qxa4 28. Bxa6 Nxa6 29. Qf4 Qd7 30. Rb7 Nc7 31. Bxd4 Ra6 32. Bb6 Bd6 33. e5 Rxb6 34. axb6 1-0

[Event "Alkmaar ACCOM op-B"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "7"]
[White "Van Zutphen, P."]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "A10"]
[PlyCount "44"]
[EventDate "1985.??.??"]
[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 g6 2. c4 Bg7 3. Nc3 a6 4. Nf3 Nc6 5. d4 e5 6. Be3 d6 7. Be2 Bg4 8. Nxe5 dxe5 9. Bxg4 exd4 10. Qb3 dxe3 11. Nd5 Nd4 12. Qxb7 exf2+ 13. Kf1 Be5 14. Rd1 Kf8 15. h4 h5 16. Bh3 Kg7 17. Rxd4 Bxd4 18. Nxc7 Qe7 19. Qxa8 Qb4 20. Ne8+ Kh7 21. g3 Qe1+ 22. Kg2 Qg1+ 0-1

[Event "Alkmaar ACCOM op-B"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "4"]
[White "Wagenaar, J."]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "A40"]
[PlyCount "54"]
[EventDate "1985.??.??"]
[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 g6 2. c4 Bg7 3. Nc3 a6 4. e4 Nc6 5. d5 Nd4 6. Nf3 e5 7. Be3 c5 8. dxc6 dxc6 9. Be2 Ne7 10. Qd2 f5 11. 0-0-0 c5 12. Bxd4 cxd4 13. Nxe5 Bxe5 14. f4 Qa5 15. fxe5 dxc3 16. Qxc3 Qxc3+ 17. bxc3 Be6 18. Rd6 Kf7 19. exf5 Nxf5 20. Rf1 Ke7 21. Rb6 Rab8 22. g4 Ne3 23. Rf4 Rhc8 24. Rf6 Bxc4 25. Bxc4 Nxc4 26. Rbe6+ Kd7 27. h4 Rf8 0-1

[Event "NED Open-ch15"]
[Site "Dieren"]
[Date "1984.08.07"]
[Round "8"]
[White "Schlenga, Klaus"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "D66"]
[PlyCount "97"]
[EventDate "1984.07.30"]
[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 Be7 4. Nf3 Nf6 5. Bg5 0-0 6. e3 h6 7. Bh4 c6 8. Rc1 Nbd7 9. Bd3 dxc4 10. Bxc4 Nd5 11. Bg3 N7f6 12. Ne5 Nxc3 13. bxc3 Ne4 14. 0-0 Bf6 15. Ng4 Bg5 16. Qd3 Nd6 17. Bb3 Nf5 18. Bc2 Qd7 19. Rcd1 g6 20. e4 Nxg3 21. fxg3 f5 22. exf5 exf5 23. Rde1 Qg7 24. Bb3+ Kh7 25. Ne5 Bf6 26. Qc4 Re8 27. Ng4 Bd7 28. Qf7 fxg4 29. Rxe8 Bxd4+ 30. cxd4 Bxe8 31. Qc4 Rd8 32. Rf4 Rd7 33. Rxg4 Bf7 34. Qc3 Bxb3 35. axb3 c5 36. Qxc5 Rc7 37. Qa3 Qf6 38. Rf4 Qe6 39. h4 Qe3+ 40. Kh2 Qe7 41. Qxa7 g5 42. hxg5 hxg5 43. Rf1 Qe2 44. Qb6 Re7 45. Qf6 g4 46. Qh4+ Kg8 47. Qg5+ Rg7 48. Qd5+ Kh7 49. Rf8 1-0

[Event "NED Open-ch15"]
[Site "Dieren"]
[Date "1984.08.01"]
[Round "3"]
[White "Timmerman, Gert Jan"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C45"]
[WhiteElo "2275"]
[PlyCount "57"]
[EventDate "1984.07.30"]
[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 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nb3 Bb6 6. Nc3 Nge7 7. g3 a6 8. Bg2 d6 9. 0-0 Be6 10. Nd5 Ba7 11. Bg5 f6 12. Be3 Qd7 13. Bxa7 Nxa7 14. Nd4 0-0-0 15. Nf4 Bg4 16. f3 g5 17. fxg4 gxf4 18. Rxf4 Rhf8 19. Qf1 Ng6 20. Rxf6 Rxf6 21. Qxf6 Qxg4 22. Qf5+ Qxf5 23. exf5 Ne5 24. Ne6 Rg8 25. Rf1 c6 26. f6 Nf7 27. Bh3 Kb8 28. Bf5 Re8 29. Bxh7 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "Broek, Thomas"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C54"]
[PlyCount "45"]
[EventDate "1984.??.??"]
[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 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Bd2 Bxd2+ 8. Nbxd2 d5 9. exd5 Nxd5 10. Qb3 Nce7 11. 0-0 0-0 12. Ne4 b6 13. Rfe1 a5 14. Rad1 Ba6 15. Bxa6 Rxa6 16. Neg5 Ra8 17. Qc2 g6 18. Qe4 h6 19. Nh3 Qd6 20. Ne5 Rad8 21. Nd3 Nc6 22. Ne5 Nf6 23. Qxc6 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "De Geus, Gerard"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C56"]
[PlyCount "35"]
[EventDate "1984.??.??"]
[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 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. 0-0 Nf6 6. e5 d5 7. exf6 dxc4 8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. Nce4 Bb6 12. Ng3 Qa5 13. fxg7 Rg8 14. Rxe6+ fxe6 15. Qh5+ Kd7 16. Qf7+ Ne7 17. Qxe6+ Ke8 18. Nh5 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Kayser, Eddy"]
[Result "1-0"]
[ECO "B33"]
[PlyCount "63"]
[EventDate "1984.??.??"]
[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 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5 Be7 10. Bxf6 Bxf6 11. c3 0-0 12. Nc2 Bg5 13. h4 Be7 14. Nce3 Rb8 15. b4 a5 16. a3 Kh8 17. Bd3 Bd7 18. Qe2 axb4 19. axb4 Rb7 20. g3 Re8 21. 0-0 Bxh4 22. gxh4 Qxh4 23. Ng2 Qh6 24. f3 g5 25. Kf2 Rg8 26. Rh1 Qg6 27. Nge3 f6 28. Ra6 Re8 29. Ng4 Bxg4 30. fxg4 Ne7 31. Nxe7 Rexe7 32. Bxb5 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Pielaet, S."]
[Result "1/2-1/2"]
[ECO "B01"]
[PlyCount "36"]
[EventDate "1984.??.??"]
[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 d5 2. exd5 Nf6 3. d4 Qxd5 4. Nc3 Qa5 5. Nf3 Bf5 6. Bd2 c6 7. Bc4 e6 8. Ne5 Qd8 9. Bg5 Be7 10. g4 Bg6 11. h4 Ne4 12. Nxg6 Nxc3 13. Bxe7 Qxe7 14. Nxe7 Nxd1 15. Rxd1 Kxe7 16. a4 Nd7 17. a5 Rad8 18. Rh3 Nf6 1/2-1/2

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Van 't Veen, Ger"]
[Result "1/2-1/2"]
[ECO "B92"]
[PlyCount "66"]
[EventDate "1984.??.??"]
[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. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. 0-0 0-0 9. Be3 b5 10. Nd5 Nbd7 11. a4 Bb7 12. axb5 axb5 13. Qd3 Nxd5 14. exd5 Nf6 15. Bf3 Qc7 16. Nd2 Rfc8 17. Qxb5 Rcb8 18. Qd3 Ra5 19. c4 Ba6 20. b3 Ra8 21. Qc3 Bb7 22. Qb2 Nd7 23. h3 f5 24. Rxa5 Qxa5 25. Nb1 f4 26. Bd2 Qc5 27. Bc3 Nf6 28. Nd2 Bc8 29. Ne4 Qa3 30. Ra1 Qxa1+ 31. Qxa1 Rxa1+ 32. Bxa1 Bf5 33. Nxf6+ Bxf6 1/2-1/2

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "Van Zutphen, P."]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "C54"]
[PlyCount "119"]
[EventDate "1984.??.??"]
[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 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 d5 8. Bxd5 Nxd5 9. exd5 Qxd5 10. 0-0 Bxc3 11. bxc3 Bg4 12. Re1+ Kf8 13. Ba3+ Kg8 14. Qe2 f6 15. Qb2 Bxf3 16. gxf3 b6 17. Re4 h5 18. Rae1 h4 19. h3 Kf7 20. Qe2 Qd7 21. Qc4+ Kg6 22. Rg4+ Kh5 23. Ree4 g5 24. Re6 Na5 25. Qe2 Rae8 26. f4 Kg6 27. Rxg5+ Kf7 28. Qe4 c5 29. Rxe8 Rxe8 30. Qh7+ Ke6 31. Qf5+ Kd6 32. dxc5+ Kc6 33. Qxd7+ Kxd7 34. Rg7+ Kc6 35. Rxa7 Nc4 36. cxb6 Kxb6 37. Ra4 Re1+ 38. Kg2 Re4 39. Rb4+ Kc6 40. Bc1 Kd5 41. Rb8 Re1 42. Rd8+ Kc6 43. Be3 Kc7 44. Re8 Ra1 45. Bd4 f5 46. Rf8 Rxa2 47. Rxf5 Kd6 48. Rf8 Nb2 49. Re8 Nd3 50. f5 Ra1 51. Kf3 Kd7 52. Re4 Rg1 53. f6 Rg5 54. Ke2 Nc1+ 55. Kd1 Rg1+ 56. Re1 Rxe1+ 57. Kxe1 Nd3+ 58. Kf1 Nf4 59. Bc5 Nd5 60. f7 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "Van der Bruinhorst, G."]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "A08"]
[PlyCount "68"]
[EventDate "1984.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. 0-0 Bg4 5. c3 e5 6. d3 b5 7. h3 Bf5 8. Nh4 Be6 9. Kh2 Be7 10. Nf3 g5 11. Rh1 h5 12. d4 e4 13. Ne5 Nxe5 14. dxe5 Qc7 15. f4 exf3 16. exf3 Qxe5 17. f4 Qf5 18. Re1 gxf4 19. Bxf4 h4 20. Qf3 hxg3+ 21. Kg1 Qh5 22. Qxh5 Rxh5 23. Bxg3 Bxh3 24. Bf3 Rg5 25. Kh2 Be6 26. a4 b4 27. cxb4 cxb4 28. Nd2 Nf6 29. Re2 Kd7 30. Rae1 Rh8+ 31. Kg2 Bh3+ 32. Kh1 Rxg3 33. Rxe7+ Kd8 34. Kh2 Rgg8 0-1

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Carrion Lara, Luis"]
[Black "De Haas, Piet"]
[Result "0-1"]
[ECO "B76"]
[PlyCount "82"]
[EventDate "1983.??.??"]
[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 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 cxd4 5. Nxd4 d6 6. Be3 Nf6 7. f3 Nc6 8. Qd2 0-0 9. a3 Bd7 10. g4 Qa5 11. Nb3 Qc7 12. Be2 Ne5 13. g5 Ne8 14. Nd5 Qd8 15. f4 Nc6 16. 0-0-0 Rc8 17. h4 e6 18. Nc3 Na5 19. Nxa5 Qxa5 20. Nb5 Qa4 21. Nxa7 Ra8 22. Qb4 Rxa7 23. Bxa7 Qxa7 24. Kb1 Bc6 25. Bd3 Qc5 26. Qd2 Nc7 27. h5 Ra8 28. hxg6 hxg6 29. c3 Nb5 30. Bxb5 Qxb5 31. Rhe1 Rxa3 32. Qxd6 Ra8 33. e5 Qa4 34. Qa3 Be4+ 35. Ka1 Qe8 36. Rxe4 Rxa3+ 37. bxa3 Qc6 38. Rdd4 Qxc3+ 39. Ka2 Bf8 40. Ra4 Qc2+ 41. Ka1 Bxa3 0-1

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Adema, Ruud"]
[Result "1-0"]
[ECO "B02"]
[PlyCount "77"]
[EventDate "1983.??.??"]
[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 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. Nc3 Nxc3 7. dxc3 d6 8. cxd6 cxd6 9. exd6 Bxd6 10. Qg4 Qf6 11. Nf3 0-0 12. Bg5 Qf5 13. Qxf5 exf5 14. 0-0-0 Bc5 15. Rhe1 Nc6 16. b4 Bxf2 17. Re2 Bb6 18. b5 Na5 19. Bd5 h6 20. Be7 Re8 21. Rde1 f4 22. Nd4 Bg4 23. Re4 g5 24. h3 Bd7 25. a4 Rac8 26. Kc2 Bxd4 27. Rxd4 a6 28. Bxf7+ Kxf7 29. Rxd7 axb5 30. Bb4+ Kf6 31. Rd6+ Kf5 32. Rxe8 Rxe8 33. Bxa5 Re2+ 34. Rd2 Re5 35. Bc7 Rc5 36. Bd6 Rc4 37. axb5 h5 38. Rd4 Rc8 39. c4 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Kayser, Eddy"]
[Result "0-1"]
[ECO "C90"]
[PlyCount "118"]
[EventDate "1983.??.??"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. d3 Na5 10. Bc2 c5 11. Nbd2 Re8 12. Nf1 Nc6 13. h3 Bf8 14. d4 h6 15. Ng3 Qc7 16. Be3 Bd7 17. Rc1 g6 18. Qd2 Kh7 19. Rcd1 Rad8 20. d5 Na5 21. b3 Nb7 22. Nh2 Qc8 23. f3 Bg7 24. Kf2 Rf8 25. Ng4 Ng8 26. Rh1 h5 27. Nh2 h4 28. Ne2 f5 29. Bg5 Rde8 30. Bxh4 f4 31. Ng4 Nd8 32. Rdg1 Nf7 33. Ke1 g5 34. Bf2 Ngh6 35. g3 Nxg4 36. hxg4+ Kg8 37. gxf4 exf4 38. Rh5 Ne5 39. Rh3 Rf6 40. Kd1 Rh6 41. Rgh1 Rxh3 42. Rxh3 Kf7 43. Ng1 Rh8 44. Bd3 Kg6 45. Be2 Rxh3 46. Nxh3 Qh8 47. Nxf4+ gxf4 48. Qxf4 Qh1+ 49. Be1 Nf7 50. Bd3 Ne5 51. Be2 c4 52. Qe3 Bh6 53. Qb6 Bf4 54. Qxd6+ Kg5 55. Qe7+ Kg6 56. Qh4 Qg1 57. Qf2 Qh1 58. bxc4 bxc4 59. Qh4 Ba4# 0-1

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Kleyn, H."]
[Result "1-0"]
[ECO "C56"]
[PlyCount "57"]
[EventDate "1983.??.??"]
[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 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. 0-0 Bc5 6. e5 d5 7. exf6 dxc4 8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. Nce4 Bf8 12. Nxf7 Kxf7 13. Ng5+ Kg8 14. Nxe6 gxf6 15. Nxd4 Nxd4 16. Qxd4 b5 17. Be3 Bd6 18. a4 Kf7 19. axb5 Qxb5 20. Qh4 Rag8 21. g3 h5 22. Bd4 Rg6 23. Rxa7 Rhh6 24. Qe4 f5 25. Rxc7+ Bxc7 26. Qe7+ Kg8 27. Qxc7 Rf6 28. Qd8+ Rf8 29. Qg5+ 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Rietveld, Johan"]
[Result "0-1"]
[ECO "B22"]
[PlyCount "35"]
[EventDate "1983.??.??"]
[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. d4 cxd4 3. c3 Nc6 4. cxd4 d5 5. exd5 Qxd5 6. Nc3 Qxd4 7. Be3 Qxd1+ 8. Rxd1 e6 9. Nb5 Bb4+ 10. Ke2 Ba5 11. Bc5 Nge7 12. Nd6+ Kf8 13. Nf3 f6 14. Kd3 b6 15. Ba3 Bb4 16. Ke4 Bxa3 17. bxa3 Nd5 18. Bb5 0-1

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Meijer, Willem"]
[Black "De Haas, Piet"]
[Result "1/2-1/2"]
[ECO "A25"]
[PlyCount "13"]
[EventDate "1983.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. g3 g6 2. Bg2 Bg7 3. c4 e5 4. Nc3 Nc6 5. e3 d6 6. Nge2 Nf6 7. 0-0 1/2-1/2

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Van 't Veen, Ger"]
[Black "De Haas, Piet"]
[Result "1/2-1/2"]
[ECO "A25"]
[PlyCount "20"]
[EventDate "1983.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. c4 g6 2. Nc3 Bg7 3. g3 e5 4. Bg2 Nc6 5. e3 f5 6. Nge2 h5 7. h4 Nh6 8. d4 e4 9. Nf4 Ne7 10. b3 d6 1/2-1/2

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "De Geus, Gerard"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "B22"]
[PlyCount "61"]
[EventDate "1982.??.??"]
[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. c3 Nf6 3. e5 Nd5 4. d4 e6 5. Bd3 Nc6 6. Nf3 cxd4 7. cxd4 Qb6 8. 0-0 Nxd4 9. Be4 Nxf3+ 10. Qxf3 Ne7 11. Nd2 Nc6 12. Nc4 Qc5 13. Nd6+ Bxd6 14. exd6 Qxd6 15. Bf4 Qe7 16. Qg3 Qf6 17. Rac1 Nd4 18. Bd3 Nc6 19. Bd6 Qxb2 20. Rfd1 b6 21. Rxc6 dxc6 22. Be5 Qb4 23. Qxg7 Rf8 24. Be4 Qxe4 25. Bd6 c5 26. Qxf8+ Kd7 27. Qe7+ Kc6 28. a4 Bd7 29. Bb8 Kb7 30. Rxd7+ Ka6 31. Rxa7+ 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Appel, Dirk BA"]
[Result "1/2-1/2"]
[ECO "C71"]
[PlyCount "81"]
[EventDate "1982.??.??"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c4 Bd7 6. d4 exd4 7. Nxd4 Nf6 8. Nxc6 Bxc6 9. Bxc6+ bxc6 10. Nc3 g6 11. Bg5 h6 12. Be3 Bg7 13. 0-0 0-0 14. f3 Qe7 15. Qc1 Kh7 16. Rd1 Rfe8 17. Rd3 Nd7 18. Bd4 Ne5 19. Rd1 Rab8 20. c5 dxc5 21. Be3 Nc4 22. Ne2 Nxe3 23. Qxe3 Bxb2 24. Rab1 c4 25. Qa7 Rb6 26. Kf1 c3 27. Nd4 Rd8 28. Nc2 Rd2 29. Rxd2 cxd2 30. Ke2 Qd6 31. Rd1 Bc1 32. Qa8 Qc5 33. Qe8 Qc4+ 34. Kf2 Qxa2 35. h4 Qe6 36. Qd8 Qd6 37. Qe8 Kg7 38. Ne3 Qd4 39. Ke2 Rb3 40. Ng4 Bb2 41. Rxd2 1/2-1/2

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Pover, Piet"]
[Result "1-0"]
[ECO "C71"]
[PlyCount "59"]
[EventDate "1982.??.??"]
[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 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c4 Bd7 6. d4 exd4 7. Nxd4 Nxd4 8. Bxd7+ Qxd7 9. Qxd4 Ne7 10. 0-0 Nc6 11. Qd1 0-0-0 12. Nc3 f5 13. exf5 Qxf5 14. Nd5 Be7 15. Be3 Rde8 16. b4 Bf6 17. Rb1 Re4 18. b5 axb5 19. Rxb5 Qe6 20. Qa4 Kd7 21. Qb3 b6 22. Bxb6 cxb6 23. Rxb6 Rc8 24. Rxc6 Rxc6 25. Qb7+ Kd8 26. Qxc6 Bd4 27. g3 Bc5 28. Kg2 Rxc4 29. Qa8+ Qc8 30. Qa5+ 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Veenstra, Wopke"]
[Result "1-0"]
[ECO "B33"]
[PlyCount "61"]
[EventDate "1982.??.??"]
[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 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. a4 a6 8. Na3 Be6 9. Bg5 Be7 10. Nc4 Rc8 11. Bxf6 gxf6 12. Nd5 f5 13. exf5 Bxf5 14. c3 Nb8 15. Qf3 Be6 16. Rd1 Rc6 17. Be2 Nd7 18. 0-0 h5 19. Nce3 Nf6 20. Rd2 Nxd5 21. Nxd5 Bg5 22. Rdd1 Rc5 23. b4 Bg4 24. Qe4 f5 25. Qc2 Bxe2 26. Qxe2 Rc6 27. f4 Bf6 28. fxe5 Bxe5 29. Rxf5 Qh4 30. Rxe5+ dxe5 31. Qxe5+ 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "De Haas, Piet"]
[Black "Wouterson, R."]
[Result "1-0"]
[ECO "B73"]
[PlyCount "63"]
[EventDate "1982.??.??"]
[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. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. 0-0 Nc6 8. Be3 0-0 9. f4 Nd7 10. Nb3 Nb6 11. Qd2 Be6 12. f5 Nc4 13. Bxc4 Bxc4 14. Rf2 Re8 15. Rd1 Ne5 16. h3 Ba6 17. Bh6 Bh8 18. Nd5 Nc4 19. fxg6 hxg6 20. Qf4 Ne5 21. Nd4 e6 22. Bg5 Qc8 23. Nf6+ Kf8 24. Qh4 Bg7 25. Qh7 Qc5 26. Qg8+ Ke7 27. Nxe8+ Kd7 28. Qxg7 Rxe8 29. Rxf7+ Kc8 30. Rf8 Bb5 31. Rxe8+ Bxe8 32. Qe7 1-0

[Event "Alkmaar op-B"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Stortelder, Louis"]
[Black "De Haas, Piet"]
[Result "1-0"]
[ECO "A87"]
[PlyCount "47"]
[EventDate "1982.??.??"]
[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 g6 2. Nf3 Bg7 3. g3 f5 4. Bg2 Nf6 5. 0-0 d6 6. b3 c6 7. Bb2 0-0 8. c4 h6 9. Qc2 Be6 10. Nc3 Bf7 11. Rfe1 Na6 12. Rad1 e6 13. e4 Nd7 14. d5 cxd5 15. exf5 Nb4 16. Qd2 exf5 17. a3 Nc6 18. Nxd5 Nde5 19. Nd4 Bxd5 20. Bxd5+ Kh7 21. Ne6 Qb6 22. Nxg7 Kxg7 23. Bxc6 Qxc6 24. Qxd6 1-0

