[Event "Alkmaar ACCOM op"]
[Site "Alkmaar"]
[Date "1993.??.??"]
[Round "?"]
[White "Meringa, Jan"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "D53"]
[PlyCount "61"]
[EventDate "1993.??.??"]
[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 e6 2. c4 d5 3. Nc3 Nc6 4. Nf3 Nf6 5. Bg5 Be7 6. e3 0-0 7. a3 b6 8. Qc2 h6 9. h4 Bb7 10. Bxf6 Bxf6 11. cxd5 exd5 12. b4 Re8 13. Be2 Bc8 14. Bb5 Re6 15. Ne2 Ne7 16. Ng5 hxg5 17. hxg5 Bxg5 18. Qh7+ Kf8 19. Qd3 Rh6 20. Kd2 Rxh1 21. Rxh1 Bf5 22. Rh8+ Ng8 23. Qxf5 g6 24. Qf3 a5 25. Bc6 Ra7 26. Bxd5 Qe7 27. Rh7 Nh6 28. Nf4 Bxf4 29. Qxf4 Nf5 30. Rxf7+ Qxf7 31. Bxf7 1-0

[Event "Alkmaar ACCOM op"]
[Site "Alkmaar"]
[Date "1993.??.??"]
[Round "?"]
[White "Otte, Marijn Willem"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "B45"]
[PlyCount "63"]
[EventDate "1993.??.??"]
[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 e6 5. Nc3 Bc5 6. Nb3 Bb4 7. Bd2 Nf6 8. Bd3 0-0 9. f4 d6 10. g4 d5 11. e5 Ne4 12. g5 Nxc3 13. bxc3 Ba3 14. h4 d4 15. c4 Ne7 16. h5 Bb2 17. Rb1 Bc3 18. Qg4 b6 19. Rg1 Nf5 20. g6 fxg6 21. hxg6 h6 22. Ke2 Bb7 23. Nc5 bxc5 24. Rxb7 Bxd2 25. Kxd2 Qh4 26. Qxh4 Nxh4 27. Rg4 Nf5 28. Bxf5 exf5 29. Rg1 Rfe8 30. Rgb1 Kf8 31. Rf7+ Kg8 32. Rbb7 1-0

[Event "Alkmaar ACCOM op"]
[Site "Alkmaar"]
[Date "1993.??.??"]
[Round "?"]
[White "Piersma, Jan"]
[Black "Doggers, Peter"]
[Result "0-1"]
[ECO "E83"]
[PlyCount "28"]
[EventDate "1993.??.??"]
[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 Bg7 4. e4 d6 5. Be3 0-0 6. f3 Nc6 7. Bd3 e5 8. d5 Nd4 9. Nge2 Nh5 10. Ng3 Nf4 11. Bxd4 exd4 12. Nce2 Nxg2+ 13. Kf2 Ne3 14. Qg1 Qh4 0-1

[Event "Alkmaar ACCOM op"]
[Site "Alkmaar"]
[Date "1992.??.??"]
[Round "?"]
[White "De Bruijn, Aad"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "C09"]
[PlyCount "99"]
[EventDate "1992.??.??"]
[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 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Ngf3 Nc6 6. dxc5 Bxc5 7. Nb3 b6 8. Bb5 Qe7+ 9. Kf1 Bd7 10. Bg5 f6 11. Qxd5 Qd6 12. Qxd6 Bxd6 13. Rd1 Bc7 14. Be3 Nge7 15. Ke2 Rd8 16. Rd2 0-0 17. Rhd1 Bg4 18. h3 Bh5 19. Rxd8 Rxd8 20. Rxd8+ Nxd8 21. Nbd4 Kh8 22. c4 Bf7 23. b3 Nb7 24. Nc6 Nxc6 25. Bxc6 Nc5 26. Nd2 a5 27. Ne4 Ne6 28. Nc3 Bh5+ 29. f3 Nf4+ 30. Bxf4 Bxf4 31. Nd5 Bd6 32. Nxb6 Bg6 33. Be4 Be8 34. Nd5 Kg8 35. Kd3 Kf7 36. Nc3 h6 37. Bd5+ Ke7 38. Ne2 Bg6+ 39. Be4 Be8 40. Nd4 Kf8 41. c5 Bb8 42. Kc4 g6 43. Bc6 Bf7+ 44. Bd5 Be8 45. c6 Ke7 46. Nb5 Kd8 47. Kc5 Bc7 48. a4 g5 49. Nxc7 Kxc7 50. Kb5 1-0

[Event "Alkmaar ACCOM op"]
[Site "Alkmaar"]
[Date "1992.??.??"]
[Round "?"]
[White "Otte, Marijn Willem"]
[Black "Piersma, Jan"]
[Result "0-1"]
[ECO "E61"]
[PlyCount "93"]
[EventDate "1992.??.??"]
[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 Bg7 4. Bg5 0-0 5. Nf3 d6 6. e3 b6 7. Be2 Bb7 8. 0-0 Nbd7 9. Qc2 Rc8 10. Rfd1 Qe8 11. a4 a5 12. Rab1 e5 13. d5 Nc5 14. b4 axb4 15. Rxb4 Ra8 16. Rdb1 Bc8 17. e4 Nh5 18. Nd2 Nf4 19. Bxf4 exf4 20. Nb5 Qe7 21. Bf3 g5 22. h3 Na6 23. R4b3 Qf6 24. Re1 Qg6 25. Qd1 Bd7 26. Rb1 Kh8 27. Nb3 Rfd8 28. N3d4 Bxd4 29. Qxd4+ Kg8 30. e5 Bxb5 31. axb5 Nc5 32. e6 Re8 33. Qd1 Kf8 34. Bh5 Qd3 35. exf7 Rxe1+ 36. Qxe1 Qe4 37. Ra1 Rc8 38. Kh1 Qe5 39. Qd1 Ne4 40. Ra2 Nc3 41. Qd3 Ne4 42. Re2 Qa1+ 43. Kh2 Nf6 44. Qf5 Nxh5 45. Qxg5 Nf6 46. Qxf4 Kxf7 47. g4 0-1

[Event "Alkmaar ACCOM op"]
[Site "Alkmaar"]
[Date "1992.??.??"]
[Round "?"]
[White "Piersma, Jan"]
[Black "Schermer, Anton"]
[Result "0-1"]
[ECO "D52"]
[PlyCount "86"]
[EventDate "1992.??.??"]
[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 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Bb4 7. Qc2 Qa5 8. Bxf6 Nxf6 9. Nd2 0-0 10. Bd3 Re8 11. 0-0 e5 12. dxe5 Rxe5 13. Nf3 Re8 14. h3 dxc4 15. Bxc4 Qh5 16. Ne2 Bd6 17. Rfd1 Bc7 18. Rd4 g5 19. Kf1 Bxh3 20. gxh3 Qxh3+ 21. Ke1 Qxf3 22. Nc3 Ng4 23. Bxf7+ Kxf7 24. Qxh7+ Kf6 25. Rxg4 Qxg4 26. Qh6+ Ke7 27. Qg7+ Kd8 28. Rd1+ Kc8 29. Qf7 Rd8 30. Rxd8+ Bxd8 31. Qe8 Qd7 32. Qg6 b5 33. Ne4 Qd3 34. Qf5+ Qd7 35. Qg6 Ba5+ 36. Ke2 g4 37. Qh5 Kc7 38. Qe5+ Kb6 39. Qc5+ Kb7 40. Nd6+ Kb8 41. Qe5 Bc7 42. Qh8+ Qd8 43. Ne8 Kb7 0-1

[Event "Alkmaar ACCOM op"]
[Site "Alkmaar"]
[Date "1992.??.??"]
[Round "?"]
[White "Piersma, Jan"]
[Black "Strik, Aart"]
[Result "0-1"]
[ECO "A43"]
[PlyCount "70"]
[EventDate "1992.??.??"]
[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 c5 2. Nf3 cxd4 3. Nxd4 g6 4. c3 Bg7 5. e4 d6 6. Bd3 Nf6 7. f3 0-0 8. Be3 Nbd7 9. Nd2 d5 10. Ne2 Ne5 11. Bc2 dxe4 12. Nxe4 Nc4 13. Nxf6+ Bxf6 14. Qc1 Ne5 15. 0-0 b6 16. Be4 Rb8 17. Nd4 Bb7 18. Qc2 Nc4 19. Bf2 Bg5 20. Rfe1 e5 21. Nb3 Qc7 22. h4 Bh6 23. h5 Bxe4 24. Rxe4 f5 25. Re2 g5 26. Rd1 Qf7 27. Nd2 Nxd2 28. Rexd2 g4 29. Rd7 Qxh5 30. Qb3+ Kh8 31. Qd5 Bf4 32. g3 gxf3 33. gxf4 Rg8+ 34. Kf1 Qh1+ 35. Bg1 Qxg1# 0-1

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1991.??.??"]
[Round "4"]
[White "Piersma, Jan"]
[Black "Burggraaf, Jan Theodoor"]
[Result "0-1"]
[ECO "E80"]
[PlyCount "70"]
[EventDate "1991.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 d6 4. Nc3 g6 5. e4 Bg7 6. f3 0-0 7. Bd3 e6 8. Nge2 exd5 9. exd5 a6 10. a4 b6 11. 0-0 Ne8 12. Bf4 f5 13. Qd2 Ra7 14. Bg5 Bf6 15. Bxf6 Qxf6 16. Rfe1 g5 17. f4 g4 18. Ng3 Ng7 19. Re2 h5 20. Rae1 h4 21. Nf1 Nh5 22. g3 Rh7 23. Kg2 hxg3 24. hxg3 Qh6 25. Qe3 Ng7 26. Qg1 Nd7 27. Kf2 Nh5 28. Ke3 Ne5 29. Nh2 Nxf4 30. gxf4 Qh3+ 31. Kd2 Qxd3+ 32. Kc1 Nxc4 33. Qg2 Rh3 34. Rd1 Qg3 35. Qxg3 Rxg3 0-1

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1991.??.??"]
[Round "1"]
[White "Piersma, Jan"]
[Black "Seewald, Pieter C"]
[Result "0-1"]
[ECO "D94"]
[PlyCount "50"]
[EventDate "1991.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 d5 5. e3 0-0 6. Bd3 c5 7. 0-0 cxd4 8. exd4 Nc6 9. Be3 Bg4 10. h3 Bxf3 11. gxf3 dxc4 12. Bxc4 Na5 13. Bd3 Qd7 14. Kh2 Rac8 15. Qe2 Nd5 16. Rac1 Qd6+ 17. Kg2 Bxd4 18. Nxd5 Qxd5 19. Be4 Qd6 20. Rcd1 e5 21. Qb5 b6 22. b3 Rfd8 23. Qd3 f5 24. Bxf5 gxf5 25. Qxf5 Qg6+ 0-1

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1991.??.??"]
[Round "5"]
[White "Spaan, Hein"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "A00"]
[PlyCount "33"]
[EventDate "1991.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. Nc3 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nxd4 5. Qxd4 c5 6. Qa4 Nf6 7. e4 Be7 8. e5 Ng8 9. Bf4 g5 10. Bg3 Nh6 11. Bd3 0-0 12. Qe4 f5 13. exf6 Rxf6 14. Qxh7+ Kf8 15. 0-0-0 d6 16. Nd5 Re6 17. Bg6 1-0

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1991.??.??"]
[Round "6"]
[White "Visser, Paul Robert"]
[Black "Piersma, Jan"]
[Result "1/2-1/2"]
[ECO "C11"]
[PlyCount "77"]
[EventDate "1991.??.??"]
[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 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 a6 6. Nf3 c5 7. Be3 Nc6 8. Qd2 cxd4 9. Nxd4 Bb4 10. 0-0-0 Qa5 11. Nde2 0-0 12. h4 f6 13. Rh3 fxe5 14. fxe5 Ndxe5 15. Bh6 Rf7 16. Rg3 Qd8 17. Bg5 Qf8 18. Bf4 Nc4 19. Qd3 Rxf4 20. Nxf4 Qxf4+ 21. Kb1 N6e5 22. Nxd5 Nxd3 23. Nxf4 Nxf4 24. Rd8+ Kf7 25. Bxc4 Ke7 26. Rd4 Nh5 27. Rg5 g6 28. Bxe6 Bxe6 29. Rxb4 b5 30. Re4 Ng7 31. h5 Nxh5 32. Rc5 Rd8 33. b3 Nf6 34. Re1 h5 35. Rc7+ Rd7 36. Rc6 Rd6 37. Rc7+ Nd7 38. Rc8 Nf6 39. Rc7+ 1/2-1/2

[Event "Haarlem ACCOM op"]
[Site "Haarlem"]
[Date "1991.??.??"]
[Round "3"]
[White "Vlaming, Jos Pl"]
[Black "Piersma, Jan"]
[Result "0-1"]
[ECO "C02"]
[PlyCount "110"]
[EventDate "1991.??.??"]
[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 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3 Nh6 7. b4 cxd4 8. cxd4 Nf5 9. Bb2 a6 10. Be2 Bd7 11. 0-0 Be7 12. Qd2 0-0 13. Re1 Kh8 14. Bf1 Rac8 15. Qd3 Na7 16. Nc3 Qd8 17. g3 h5 18. Bh3 g5 19. g4 Nh6 20. Qf1 Kh7 21. Qg2 Rg8 22. Rac1 h4 23. Qf1 Qf8 24. Qd3+ Kh8 25. Rc2 Qg7 26. Bc1 Nb5 27. Nxb5 Bxb5 28. Qd2 Bc4 29. Nxh4 gxh4 30. Qxh6+ Qxh6 31. Bxh6 Rce8 32. Bf4 Rc8 33. f3 Bd3 34. Rxc8 Rxc8 35. Rc1 Bc4 36. Kf2 b5 37. Be3 Kg7 38. f4 Rf8 39. g5 Kg6 40. Bg4 a5 41. Bd2 axb4 42. Bxb4 Bxb4 43. axb4 Ra8 44. Rc2 Ra3 45. Be2 Rb3 46. Kg2 Bxe2 47. Rxe2 Rxb4 48. Rd2 Rb3 49. Rc2 b4 50. f5+ Kxf5 51. Rf2+ Kg6 52. Rf6+ Kg7 53. Rf4 h3+ 54. Kg1 Rd3 55. Rf2 Rd1+ 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1990.??.??"]
[Round "4"]
[White "Piersma, Jan"]
[Black "Duys, P."]
[Result "0-1"]
[ECO "A19"]
[PlyCount "70"]
[EventDate "1990.??.??"]
[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. Nc3 c5 4. e4 cxd4 5. Qxd4 Nc6 6. Qd1 Bb4 7. Bd3 0-0 8. Nf3 d5 9. exd5 exd5 10. 0-0 dxc4 11. Bxc4 Bg4 12. Nd5 Nxd5 13. Qxd5 Qf6 14. Qg5 Qxg5 15. Nxg5 Ne5 16. Bd5 Be2 17. Bf4 Nd3 18. Bxb7 Nxf4 19. Rfc1 Rad8 20. g3 Nd3 21. Rc2 Bh5 22. Be4 h6 23. Nf3 f5 24. Bb7 Rd7 25. Bc8 Rdd8 26. Bb7 Rf6 27. Nh4 g5 28. Ng2 Ne5 29. Ne3 Bf7 30. Rc7 f4 31. Nc2 Bd6 32. Rc3 fxg3 33. hxg3 Ng4 34. Bf3 Nxf2 35. Kxf2 g4 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1990.??.??"]
[Round "6"]
[White "Piersma, Jan"]
[Black "Kager, Kees"]
[Result "1/2-1/2"]
[ECO "D44"]
[PlyCount "51"]
[EventDate "1990.??.??"]
[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 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. Bg5 dxc4 6. a4 Bb4 7. e3 b5 8. Be2 Qb6 9. 0-0 Bxc3 10. bxc3 Ne4 11. Qc2 Nxg5 12. Nxg5 Qc7 13. f4 h6 14. Ne4 Nd7 15. Qb2 Bb7 16. Qa3 c5 17. Bf3 b4 18. cxb4 Bxe4 19. Bxe4 cxb4 20. Qxb4 Rb8 21. Qc3 Rb3 22. Qc1 0-0 23. Bc2 Rb4 24. Qd2 Rfb8 25. Rfb1 a5 26. Qd1 1/2-1/2

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1990.??.??"]
[Round "1"]
[White "Piersma, Jan"]
[Black "Rietveld, Johan"]
[Result "1/2-1/2"]
[ECO "D53"]
[PlyCount "50"]
[EventDate "1990.??.??"]
[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. Bg5 Be7 4. Nc3 d5 5. Nf3 Nbd7 6. e3 h6 7. Bh4 b6 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Qb3 Bb7 12. Rc1 Rc8 13. Bd3 0-0 14. 0-0 c5 15. Qa3 Rc7 16. dxc5 Nxc5 17. Bb1 Rfc8 18. Nd4 a6 19. Bf5 Re8 20. Rc2 g6 21. Bh3 Ne4 22. Qxe7 Rcxe7 23. Nb3 f5 24. g3 Ng5 25. Bg2 Ne6 1/2-1/2

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1990.??.??"]
[Round "7"]
[White "Piersma, Jan"]
[Black "Temming, Jan"]
[Result "1-0"]
[ECO "E83"]
[PlyCount "117"]
[EventDate "1990.??.??"]
[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 Nc6 7. Bd3 e5 8. d5 Ne7 9. Nge2 Ne8 10. Qd2 f5 11. 0-0-0 a6 12. Kb1 Bd7 13. h4 Nf6 14. Bg5 b5 15. Bxf6 Bxf6 16. cxb5 axb5 17. Bxb5 Bxb5 18. Nxb5 Qb8 19. Nec3 Ra5 20. a4 Nc8 21. b3 Na7 22. Rc1 Qb6 23. Kb2 Nxb5 24. Nxb5 fxe4 25. Rc6 e3 26. Qb4 Rxb5 27. axb5 Qd4+ 28. Qxd4 exd4 29. Kc2 Rb8 30. b6 cxb6 31. Rxd6 Kg7 32. g3 Rc8+ 33. Rc6 Ra8 34. Kd3 Ra2 35. Rc2 Ra5 36. Ke4 Rb5 37. Rb1 h5 38. f4 Ra5 39. Rd1 Ra8 40. Rc7+ Kf8 41. Kd3 Rd8 42. Rc6 Ke7 43. Ke4 Rb8 44. Rdc1 Rb7 45. Rc7+ Rxc7 46. Rxc7+ Kd6 47. Rc6+ Ke7 48. Kd3 b5 49. Rb6 b4 50. Rxb4 Kd6 51. Rc4 Kxd5 52. b4 Bg7 53. Rc5+ Kd6 54. Rc2 Ke6 55. b5 Kf5 56. b6 Kg4 57. b7 Kxg3 58. b8Q Kxh4 59. Qd8+ 1-0

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1990.??.??"]
[Round "3"]
[White "Van Beusekom, Leo"]
[Black "Piersma, Jan"]
[Result "0-1"]
[ECO "E12"]
[PlyCount "106"]
[EventDate "1990.??.??"]
[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 e6 2. c4 d5 3. Nf3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Bd3 Nbd7 7. Nc3 b6 8. 0-0 Bb7 9. Qc2 dxc4 10. Bxc4 Bxf3 11. gxf3 Nh5 12. Bxe7 Qxe7 13. Bd3 g6 14. Be4 Rac8 15. Qa4 a5 16. Bc6 Nb8 17. Bb7 Rcd8 18. Qb5 Qb4 19. Rac1 c5 20. Qxb4 cxb4 21. Nb5 Rd7 22. Bc6 Rdd8 23. Bb7 Rd7 24. Ba8 Na6 25. Bc6 Rdd8 26. Bb7 Nb8 27. Rc7 Nf6 28. e4 Ne8 29. Re7 Nd6 30. Nxd6 Rxd6 31. d5 exd5 32. exd5 Nd7 33. Rc1 Nf6 34. Rd1 Rfd8 35. Re5 Nd7 36. Re7 Kf8 37. Rde1 Nf6 38. R7e5 Nxd5 39. Bxd5 Rxd5 40. Rxd5 Rxd5 41. Re2 b3 42. axb3 Rd3 43. b4 a4 44. Kg2 Rb3 45. Kf1 Rxb4 46. Kg2 Rb3 47. Kg3 b5 48. Kg2 Rd3 49. Re5 Rb3 50. Re2 Kg7 51. f4 b4 52. h3 a3 53. bxa3 bxa3 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1990.??.??"]
[Round "5"]
[White "Van der Wakker, Peter"]
[Black "Piersma, Jan"]
[Result "0-1"]
[ECO "A28"]
[PlyCount "54"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. d4 e4 6. Nd2 Bxc3 7. bxc3 d6 8. Qc2 Bf5 9. Qb3 b6 10. Qb5 Qd7 11. Be2 0-0 12. 0-0 a6 13. Qa4 Nxd4 14. Qd1 Nxe2+ 15. Qxe2 Rfe8 16. Nb3 c5 17. f3 exf3 18. gxf3 Qa4 19. Bb2 Nd7 20. e4 Be6 21. Qd2 Bxc4 22. Rf2 Re6 23. Kh1 Ne5 24. Nc1 Rf6 25. f4 Ng6 26. Nd3 Qc6 27. Re1 Re8 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1988.??.??"]
[Round "4"]
[White "Lemmen, Gerrit"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "C01"]
[PlyCount "127"]
[EventDate "1988.??.??"]
[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. exd5 exd5 4. Nf3 Nf6 5. Bg5 Be7 6. Bd3 Bg4 7. Nc3 c6 8. 0-0 0-0 9. Re1 Re8 10. h3 Bxf3 11. Qxf3 Nbd7 12. Ne2 Qb6 13. b3 a5 14. c3 Qc7 15. Ng3 h6 16. Bf4 Bd6 17. Bxd6 Qxd6 18. Nf5 Qc7 19. Re3 Rxe3 20. fxe3 Re8 21. Re1 Nf8 22. Qg3 Qxg3 23. Nxg3 g6 24. e4 dxe4 25. Nxe4 Nxe4 26. Rxe4 Rxe4 27. Bxe4 Nd7 28. d5 cxd5 29. Bxd5 b6 30. b4 axb4 31. cxb4 Kf8 32. a4 Nb8 33. a5 bxa5 34. bxa5 Ke7 35. Bb7 Kd7 36. Bd5 f6 37. Kf2 Kd6 38. Be4 f5 39. Bd3 Nc6 40. a6 Kc5 41. Kg3 Kd4 42. Bb5 Na7 43. Bd7 Ke5 44. Kf3 g5 45. g3 Kf6 46. h4 Ke5 47. Ke3 Kf6 48. Kd4 gxh4 49. gxh4 f4 50. Ke4 Ke7 51. Bg4 Kf6 52. Kxf4 Kf7 53. Bd7 Kf6 54. Kg4 Kg6 55. Be8+ Kg7 56. Kf5 Nc8 57. Bd7 Na7 58. h5 Kf7 59. Ke5 Ke7 60. Bg4 Nc6+ 61. Kf5 Kf7 62. Be2 Na7 63. Bc4+ Kg7 64. Ke6 1-0

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1988.??.??"]
[Round "1"]
[White "Piersma, Jan"]
[Black "De Waal, Jacobus"]
[Result "1/2-1/2"]
[ECO "A34"]
[PlyCount "108"]
[EventDate "1988.??.??"]
[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 e6 2. c4 c5 3. Nf3 Nf6 4. Nc3 Be7 5. Bg5 0-0 6. e3 b6 7. g3 Bb7 8. Bxf6 Bxf6 9. Bg2 Nc6 10. 0-0 a6 11. a3 Rb8 12. Re1 d5 13. cxd5 exd5 14. Rc1 c4 15. Nd2 Ne7 16. Ne2 h5 17. Nf4 g6 18. Nb1 Kg7 19. h4 Rh8 20. Nc3 b5 21. Bf3 Qd6 22. Kg2 Rbd8 23. b4 Rd7 24. Rb1 Qb8 25. Qe2 Qa8 26. Ra1 Re8 27. Bxh5 Nf5 28. Qg4 Rde7 29. Nxg6 Nh6 30. Nxe7+ Nxg4 31. Nf5+ Kf8 32. Bxg4 Bc8 33. Bh3 Qc6 34. Rh1 Be6 35. Nh6 Rd8 36. Ng4 Bg7 37. Nh2 Ke7 38. Bxe6 fxe6 39. f4 e5 40. fxe5 Bxe5 41. Nf3 Bc7 42. Rhf1 Qg6 43. Ne2 Rg8 44. Ng5 Kd6 45. Rf2 Bd8 46. Nf7+ Kc7 47. Nxd8 Kxd8 48. Kh2 c3 49. Rc1 Qd3 50. Rxc3 Qd2 51. Rg2 Re8 52. Rc5 Qxe3 53. Rxd5+ Kc7 54. Nf4 Qe4 1/2-1/2

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1988.??.??"]
[Round "3"]
[White "Piersma, Jan"]
[Black "Lansbergen, Aad"]
[Result "1-0"]
[ECO "A45"]
[PlyCount "77"]
[EventDate "1988.??.??"]
[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. Bg5 e6 3. Bxf6 Qxf6 4. e4 Bb4+ 5. c3 Ba5 6. Nf3 0-0 7. Nbd2 d5 8. Bd3 c6 9. Qc2 Nd7 10. e5 Qh6 11. 0-0-0 b5 12. h4 a6 13. g4 g6 14. g5 Qg7 15. h5 Re8 16. hxg6 fxg6 17. Nh2 Nf8 18. Ng4 Bd8 19. f4 Qa7 20. Nf3 c5 21. dxc5 Qxc5 22. Rh2 a5 23. Rdh1 Ra7 24. Nh4 Rg7 25. Nf6+ Bxf6 26. gxf6 Qe3+ 27. Kb1 Rc7 28. Nxg6 d4 29. Ne7+ Rcxe7 30. fxe7 Rxe7 31. Bxh7+ Kf7 32. Ka1 Ke8 33. Be4 Rg7 34. a3 b4 35. cxd4 Bd7 36. Bc6 b3 37. Bxd7+ Kxd7 38. Qc1 Qg3 39. Rh3 1-0

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1988.??.??"]
[Round "6"]
[White "Piersma, Jan"]
[Black "Zweers, T."]
[Result "0-1"]
[ECO "D58"]
[PlyCount "66"]
[EventDate "1988.??.??"]
[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 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 Be7 5. Nc3 0-0 6. e3 Nbd7 7. Bd3 dxc4 8. Bxc4 h6 9. Bh4 b6 10. 0-0 Bb7 11. Re1 c5 12. dxc5 Bxc5 13. Bb5 a6 14. Bxd7 Qxd7 15. Ne5 Qxd1 16. Raxd1 g5 17. Bg3 Rfd8 18. a3 Rac8 19. h4 Rxd1 20. Nxd1 Ne4 21. Bh2 Rd8 22. hxg5 hxg5 23. Ng4 f5 24. Ne5 Bd6 25. f3 Nd2 26. Kf2 Rc8 27. Ke2 Nb3 28. Kf2 Rc5 29. Nd7 Rc2+ 30. Kg1 Bxh2+ 31. Kxh2 Bxf3 32. Kg3 Bc6 33. Nf2 Bxd7 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1988.??.??"]
[Round "2"]
[White "Van der Sluijs, Lothar"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "C11"]
[PlyCount "53"]
[EventDate "1988.??.??"]
[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 Nf6 4. e5 Nfd7 5. Nf3 c5 6. dxc5 Bxc5 7. Bd3 Nc6 8. Bf4 Qb6 9. 0-0 Qxb2 10. Na4 Qb4 11. Nxc5 Qxf4 12. Nxd7 Bxd7 13. g3 Qa4 14. Re1 Rc8 15. a3 Ne7 16. Rb1 b6 17. Rb3 Rc5 18. Qe2 0-0 19. Rb4 Qxa3 20. Bxh7+ Kxh7 21. Ng5+ Kg6 22. Rh4 Rh8 23. Rxh8 f6 24. Qh5+ Kf5 25. Nh3+ g5 26. Nxg5 fxg5 27. Rf8# 1-0

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "3"]
[White "Duys, P."]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "C18"]
[PlyCount "63"]
[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 c4 7. a4 Ne7 8. Nf3 h6 9. Be2 Qa5 10. 0-0 Bd7 11. Qd2 Bxa4 12. Ba3 Nbc6 13. Rfb1 b5 14. Nh4 g5 15. Nf3 Kd7 16. h3 Rag8 17. Nh2 h5 18. g4 hxg4 19. Bxg4 Nf5 20. Nf3 Nh6 21. Nh2 Nxg4 22. Nxg4 Rg7 23. Kg2 Qd8 24. Nf6+ Kc8 25. Re1 Ne7 26. Bxe7 Qxe7 27. Re3 Rg6 28. Rg3 Kb7 29. Rxg5 Rxg5+ 30. Qxg5 Bxc2 31. h4 Kb6 32. Nxd5+ 1-0

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "6"]
[White "Piersma, Jan"]
[Black "Altena, R."]
[Result "0-1"]
[ECO "D55"]
[PlyCount "110"]
[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 e6 2. c4 d5 3. Nf3 Nf6 4. Bg5 Be7 5. Nc3 0-0 6. e3 b6 7. Bxf6 Bxf6 8. cxd5 exd5 9. h3 Re8 10. Bd3 c5 11. 0-0 Bb7 12. Qc2 h6 13. b3 Nc6 14. Ne2 Rc8 15. Qd2 Nb4 16. Bf5 Rc7 17. a3 Nc6 18. Rac1 Na5 19. Bc2 Ba6 20. Rfe1 Nc6 21. Nf4 cxd4 22. exd4 Rxe1+ 23. Rxe1 Nxd4 24. Nxd4 Bxd4 25. Qxd4 Rxc2 26. Qxd5 Qxd5 27. Nxd5 Rb2 28. Re3 Rb1+ 29. Kh2 Rb2 30. Kg3 Be2 31. Ne7+ Kh7 32. Nc6 Bd1 33. Nxa7 Rxb3 34. Rxb3 Bxb3 35. Nc8 b5 36. Nd6 Ba4 37. Nxf7 Kg6 38. Nd6 Kf6 39. Kf4 Ke6 40. Ne4 Kd5 41. Ke3 Kc4 42. Kd2 Kb3 43. Kc1 Kxa3 44. Nc3 Kb3 45. Nxa4 Kxa4 46. Kb2 Kb4 47. g4 Kc4 48. h4 Kd4 49. Kb3 Ke4 50. Kb4 Kf3 51. g5 Kxf2 52. gxh6 gxh6 53. Kxb5 Kg3 54. h5 Kg4 55. Kc4 Kxh5 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "4"]
[White "Piersma, Jan"]
[Black "Nibbering, S."]
[Result "0-1"]
[ECO "A52"]
[PlyCount "98"]
[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 e5 3. dxe5 Ng4 4. Nf3 Nc6 5. Bf4 Bb4+ 6. Nc3 Qe7 7. Qd5 Bc5 8. e3 Nb4 9. Qd1 d6 10. exd6 Bxd6 11. Bxd6 Qxd6 12. Qxd6 cxd6 13. Nd4 a6 14. a3 Nc6 15. Nxc6 bxc6 16. Be2 Nf6 17. 0-0-0 Ke7 18. h3 Be6 19. g4 h6 20. f4 g6 21. e4 Bc8 22. Rhe1 Bb7 23. Bf1 Rhd8 24. e5 dxe5 25. Rxe5+ Kf8 26. Rde1 Re8 27. Rxe8+ Rxe8 28. Rxe8+ Kxe8 29. Bg2 Ke7 30. Kc2 Kd6 31. Ne4+ Nxe4 32. Bxe4 Kc5 33. Kc3 Kd6 34. Kb4 c5+ 35. Ka5 Bxe4 36. Kxa6 Kc6 37. b4 cxb4 38. axb4 Bd3 39. b5+ Kc5 40. b6 Bxc4+ 41. Ka7 Bd5 42. b7 Bxb7 43. Kxb7 Kd5 44. Kc7 Ke4 45. g5 h5 46. Kd7 Kxf4 47. Ke8 Kxg5 48. Kxf7 Kf5 49. Kg8 g5 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "2"]
[White "Piersma, Jan"]
[Black "Schermer, Anton"]
[Result "0-1"]
[ECO "D36"]
[PlyCount "90"]
[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 d5 2. c4 Nf6 3. Nf3 e6 4. Bg5 Nbd7 5. Nc3 c6 6. cxd5 exd5 7. e3 Be7 8. Bd3 0-0 9. 0-0 Re8 10. Qc2 Nf8 11. h3 Nh5 12. Bxe7 Qxe7 13. Ne2 Nf6 14. Ne5 Ne4 15. Bxe4 dxe4 16. Ng3 Kh8 17. Rae1 f6 18. Nc4 Be6 19. b3 Rac8 20. Rd1 Bd5 21. Nf5 Qe6 22. Nfd6 Bxc4 23. Nxc4 Rcd8 24. f3 exf3 25. Rxf3 Ng6 26. Qf2 c5 27. a4 a6 28. Rd3 b5 29. axb5 axb5 30. Nd2 Ne5 31. dxe5 Rxd3 32. exf6 gxf6 33. e4 Rxf3 34. Qxf3 Qe5 35. Kh1 Rd8 36. Qe2 Qd4 37. Nf1 c4 38. bxc4 bxc4 39. Qc2 c3 40. Kh2 Kg7 41. Ng3 Qd2 42. Nf5+ Kf8 43. Qb3 Qb2 44. Qe6 Qb8+ 45. Kg1 Qe5 0-1

[Event "Haarlem ACCOM op2"]
[Site "Haarlem"]
[Date "1986.??.??"]
[Round "1"]
[White "Veel, Elbert"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "C16"]
[PlyCount "84"]
[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 Nd7 5. Nf3 b6 6. Bd2 Ne7 7. Bd3 c5 8. Nb5 Bxd2+ 9. Qxd2 0-0 10. c3 cxd4 11. cxd4 f6 12. Rc1 fxe5 13. Nc7 e4 14. Nxe6 Qe8 15. Bb5 exf3 16. Qg5 Nf5 17. Rc6 Rf6 18. Kd2 h6 19. Nxg7 hxg5 20. Nxe8 Rxc6 21. Bxc6 Nxd4 22. Bxa8 fxg2 23. Bxd5+ Kf8 24. Bxg2 Kxe8 25. h4 g4 26. Re1+ Kf8 27. Re4 Nf3+ 28. Bxf3 gxf3 29. Rf4+ Kg7 30. Rxf3 Ne5 31. Rc3 Bg4 32. Rg3 Kf6 33. f4 Nf3+ 34. Ke3 Nxh4 35. Rxg4 Nf5+ 36. Ke4 Nd6+ 37. Kd5 Nf5 38. Kc6 Nd4+ 39. Kb7 Kf5 40. Rg8 Kxf4 41. Kxa7 b5 42. Kb6 Ke3 1-0

[Event "Alkmaar ACCOM op-A"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "5"]
[White "Adema, Ruud"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "A28"]
[PlyCount "123"]
[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. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Nxd4 6. Qxd4 Be7 7. g3 0-0 8. Bg2 c6 9. 0-0 Re8 10. e4 d6 11. h3 Be6 12. Rd1 Qa5 13. Ne2 Rad8 14. Be3 d5 15. cxd5 cxd5 16. exd5 Nxd5 17. Qxa7 Qxa7 18. Bxa7 Rd7 19. Nd4 Red8 20. Nxe6 fxe6 21. Bxd5 Rxd5 22. Rxd5 Rxd5 23. Be3 Bf6 24. Rb1 Kf7 25. Kg2 Bd4 26. Rd1 Bxb2 27. Rb1 Bc3 28. Rxb7+ Kf6 29. Ra7 Ra5 30. Rxa5 Bxa5 31. Kf3 g6 32. Ke4 Kf7 33. g4 Bb4 34. a4 Ba5 35. Bc5 Kg7 36. Ke5 Kf7 37. Kd6 Kf6 38. f4 Bd2 39. Bd4+ Kf7 40. Be5 h6 41. Kc6 Ke7 42. Kb5 Kd7 43. a5 Bxa5 44. Kxa5 Kc6 45. h4 h5 46. gxh5 gxh5 47. Bf6 Kd5 48. Kb5 Ke4 49. Bg5 Kd5 50. Kb6 e5 51. fxe5 Kxe5 52. Kc7 Ke6 53. Kd8 Kf7 54. Kd7 Kg6 55. Ke6 Kh7 56. Kf6 Kh8 57. Kg6 Kg8 58. Bf6 Kf8 59. Kxh5 Kf7 60. Kg5 Kg8 61. Kg6 Kf8 62. h5 1-0

[Event "Alkmaar ACCOM op-A"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "1"]
[White "De Raad, H."]
[Black "Piersma, Jan"]
[Result "0-1"]
[ECO "D53"]
[PlyCount "72"]
[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 e6 2. c4 d5 3. Nf3 Nf6 4. Bg5 Be7 5. Nc3 0-0 6. e3 Nc6 7. a3 b6 8. Bd3 Ba6 9. cxd5 Bxd3 10. Qxd3 exd5 11. 0-0 Na5 12. Nd2 c6 13. Rac1 Qd7 14. h3 Rfe8 15. Ne2 Nb7 16. Ng3 Nd6 17. f3 Rac8 18. Bf4 Nb5 19. a4 Nc7 20. e4 dxe4 21. fxe4 Ne6 22. Be5 c5 23. Nf5 cxd4 24. Nxe7+ Qxe7 25. Rxc8 Rxc8 26. Qf3 Nd7 27. Qg3 Nxe5 28. Qxe5 Rc2 29. Nf3 d3 30. Nd4 Qc5 31. Qb8+ Nf8 32. Qe8 Qxd4+ 33. Kh1 Qd7 34. Qe5 d2 35. Rd1 Rc1 36. Qh5 Qxa4 0-1

[Event "Alkmaar ACCOM op-A"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "2"]
[White "Piersma, Jan"]
[Black "Duijs, Peter"]
[Result "1-0"]
[ECO "B14"]
[PlyCount "79"]
[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 Nf6 2. c4 e6 3. Nf3 c5 4. e3 Nc6 5. Nc3 cxd4 6. exd4 d5 7. Bg5 Be7 8. Bd3 h6 9. Bh4 dxc4 10. Bxc4 0-0 11. 0-0 a6 12. Re1 b5 13. Bb3 Bb7 14. a3 Rc8 15. Bxf6 Bxf6 16. Ne2 Na5 17. Ng3 Nxb3 18. Qxb3 Bxf3 19. Qxf3 Bxd4 20. Rad1 Qb6 21. Rd2 Rc4 22. Red1 Rfc8 23. Ne2 Bf6 24. h3 b4 25. b3 R4c6 26. a4 a5 27. Kf1 Qa6 28. Kg1 Rc2 29. Rxc2 Rxc2 30. Nf4 Rc3 31. Rd3 Rc1+ 32. Kh2 Be5 33. Rd8+ Kh7 34. Qe4+ f5 35. Qxe5 Qf1 36. Qxe6 Qg1+ 37. Kg3 Rc3+ 38. Nd3 f4+ 39. Kxf4 Qh2+ 40. Kf3 1-0

[Event "Alkmaar ACCOM op-A"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "6"]
[White "Piersma, Jan"]
[Black "Plooijer, Johan"]
[Result "1/2-1/2"]
[ECO "A85"]
[PlyCount "86"]
[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 e6 2. c4 f5 3. Nf3 Nf6 4. Bg5 Be7 5. Nc3 d6 6. e3 0-0 7. Bd3 Nbd7 8. Qc2 h6 9. Bh4 Qe8 10. 0-0-0 c6 11. h3 Nh5 12. g4 g5 13. gxh5 Qxh5 14. Bxg5 hxg5 15. Be2 Qh6 16. Rdg1 Kf7 17. h4 g4 18. Nd2 Rg8 19. h5 Nf6 20. Nf1 Bd7 21. Kb1 Rg5 22. Ng3 e5 23. Qb3 b6 24. dxe5 dxe5 25. c5+ Kf8 26. cxb6 axb6 27. Qxb6 f4 28. Nge4 Rxh5 29. Rxh5 Qxh5 30. Nxf6 Bxf6 31. Qb7 Rd8 32. e4 Ke8 33. Rd1 f3 34. Bc4 Qh2 35. Qb6 Bh4 36. Qc5 Bxf2 37. Qd6 Qh5 38. Be6 Bd4 39. Bxd7+ Rxd7 40. Qxc6 g3 41. Qe6+ Re7 42. Qg8+ Kd7 43. Qxg3 f2 1/2-1/2

[Event "Alkmaar ACCOM op-A"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "3"]
[White "Piersma, Jan"]
[Black "Van der Meiden, Dirk"]
[Result "1-0"]
[ECO "D37"]
[PlyCount "59"]
[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 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. e3 d5 6. Be2 Be7 7. Qc2 0-0 8. 0-0 c5 9. dxc5 bxc5 10. Rd1 Qc7 11. cxd5 exd5 12. b3 Nc6 13. a3 Rad8 14. Bb2 a6 15. Rac1 Rc8 16. Na4 Nb8 17. Bxf6 Bxf6 18. Bd3 g6 19. Nxc5 Be7 20. Nxb7 Qxb7 21. Qa2 Rxc1 22. Rxc1 Rc8 23. Rxc8+ Qxc8 24. b4 Qc3 25. Qxd5 Qxa3 26. Ne5 Qxb4 27. g3 Qd6 28. Qxf7+ Kh8 29. Nxg6+ hxg6 30. Bxg6 1-0

[Event "Alkmaar ACCOM op-A"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "4"]
[White "Ruiter, N."]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "C02"]
[PlyCount "61"]
[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 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 f6 6. Bd3 cxd4 7. cxd4 Qb6 8. 0-0 Bd7 9. Nc3 fxe5 10. dxe5 0-0-0 11. Nb5 Kb8 12. Qe2 Be8 13. Be3 d4 14. Bg5 Rd7 15. a4 h6 16. Bd2 a6 17. a5 Qd8 18. Na3 Bxa3 19. Rxa3 Qe7 20. Rb3 Ka7 21. Bxa6 bxa6 22. Rb6 Nb8 23. Nxd4 Rxd4 24. Be3 Bb5 25. Qf3 Nc6 26. Rxc6 Bxc6 27. Qxc6 Qb7 28. Bxd4+ Ka8 29. Qe8+ Qb8 30. Qxe6 Qb7 31. Bc5 1-0

[Event "Alkmaar ACCOM op-A"]
[Site "Alkmaar"]
[Date "1985.??.??"]
[Round "7"]
[White "Van der Berg, A."]
[Black "Piersma, Jan"]
[Result "1/2-1/2"]
[ECO "D33"]
[PlyCount "55"]
[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 e6 2. c4 d5 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nf6 6. g3 Nc6 7. Bg2 Bg4 8. Ne5 cxd4 9. Nxc6 bxc6 10. Qxd4 Qd7 11. 0-0 Be7 12. Bg5 0-0 13. e3 Rab8 14. Rfc1 Rb4 15. Qd2 Rfb8 16. b3 a5 17. Na4 R4b5 18. Bf4 Rc8 19. f3 Bf5 20. Bf1 Bb4 21. Qd1 Ba3 22. Bxb5 Bxc1 23. Rxc1 cxb5 24. Nb6 Rxc1 25. Qxc1 Qb7 26. Qc5 Nd7 27. Nxd7 Qxd7 28. Qc7 1/2-1/2

[Event "Alkmaar op-C"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Ooyevaar"]
[Black "Piersma, Jan"]
[Result "1-0"]
[ECO "C57"]
[PlyCount "44"]
[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. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 Kxf7 7. Qf3+ Ke6 8. Nc3 Ncb4 9. Qe4 c6 10. a3 Na6 11. d4 Qd6 12. Bf4 Kf7 13. Bxe5 Qg6 14. Bxd5+ cxd5 15. Qxd5+ Qe6 16. Qf3+ Qf5 17. Qe2 Bd6 18. Bxd6 Re8 19. Be5 Nc5 20. Qc4+ Ne6 21. 0-0-0 Qg5+ 22. f4 b5 1-0

[Event "Alkmaar op-C"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Piersma, Jan"]
[Black "Boots, Arie"]
[Result "1-0"]
[ECO "D38"]
[PlyCount "77"]
[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 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 h6 5. Bh4 Bb4+ 6. Nc3 Nc6 7. a3 Ba5 8. b4 Bb6 9. c5 Bxc5 10. bxc5 0-0 11. e3 Qe8 12. Bxf6 g6 13. Bb5 Bd7 14. Bxc6 Bxc6 15. 0-0 Qd7 16. Ne5 Qe8 17. Qd2 h5 18. e4 Kh7 19. exd5 exd5 20. Rfe1 Qe6 21. Bh4 Be8 22. Nf3 Qf5 23. Re5 Qd7 24. Rxd5 Qc6 25. Qd3 a6 26. Rxh5+ Kg8 27. Rg5 Kg7 28. Ne5 Qf6 29. Rxg6+ fxg6 30. Bxf6+ Rxf6 31. Nd5 Rf5 32. g4 Bb5 33. Qe4 Rg5 34. h4 Rxe5 35. Qxe5+ Kh7 36. Qxc7+ Kh6 37. g5+ Kh5 38. Nf6+ Kxh4 39. Qh7+ 1-0

