[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "Nibbering, S."]
[Black "Siekerman, Peter"]
[Result "0-1"]
[ECO "C08"]
[PlyCount "56"]
[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 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Bb5+ Nc6 6. Qe2+ Be6 7. Ngf3 Nf6 8. c4 Rc8 9. 0-0 Be7 10. Re1 0-0 11. cxd5 Nxd5 12. Ne4 Nxd4 13. Nxd4 cxd4 14. Bd3 Qb6 15. Nd2 Bb4 16. Qe4 Nf6 17. Qe2 Rfe8 18. Qf3 Bg4 19. Rxe8+ Rxe8 20. Qf4 Bd6 21. Qg5 Re5 22. Nc4 Re1+ 23. Bf1 Qa6 24. Qd2 Rd1 25. Qc2 d3 26. Qc3 Ne4 27. Qd4 Be2 28. Nd2 Nxd2 0-1

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Leydes, A."]
[Result "0-1"]
[ECO "B01"]
[PlyCount "60"]
[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. c4 c6 4. dxc6 Nxc6 5. Nc3 Bf5 6. Nf3 e5 7. a3 Rc8 8. d3 Bd6 9. Bg5 h6 10. Bh4 0-0 11. Be2 Re8 12. 0-0 g5 13. Bg3 Bb8 14. h4 g4 15. Ne1 Nd4 16. Kh1 a6 17. f3 Nh5 18. Kh2 Nxg3 19. Kxg3 e4+ 20. f4 Nxe2+ 21. Qxe2 exd3 22. Qd2 Qd4 23. Nc2 Qxc4 24. Ne3 Qc5 25. Nxf5 Qxf5 26. Rae1 Bc7 27. Re3 Bb6 28. Rxd3 Rcd8 29. Rxd8 Rxd8 30. Qc1 Rd3+ 0-1

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1984.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Van der Berg, Eddy"]
[Result "0-1"]
[ECO "C86"]
[PlyCount "60"]
[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. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Qe2 b5 7. Bb3 d6 8. h3 0-0 9. Rd1 Na5 10. d4 exd4 11. Nxd4 c5 12. Nf3 c4 13. e5 Ne8 14. exd6 Nxd6 15. Bf4 Nab7 16. Nc3 Be6 17. Ne4 Qb6 18. Neg5 Bxg5 19. Nxg5 Bf5 20. Rd5 h6 21. Nf3 Be4 22. Rh5 Rfe8 23. Qd2 Rad8 24. Bxh6 Nf5 25. Qg5 Nxh6 26. Re1 Bxf3 27. Rxe8+ Rxe8 28. gxf3 Qg6 29. Qxg6 fxg6 30. Rg5 cxb3 0-1

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Mulder, Rob"]
[Black "Siekerman, Peter"]
[Result "1-0"]
[ECO "D80"]
[PlyCount "71"]
[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. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bg5 Ne4 5. Bf4 Nxc3 6. bxc3 Bg7 7. Nf3 0-0 8. e3 c5 9. Bd3 Nc6 10. 0-0 Bg4 11. h3 dxc4 12. Bxc4 Bxf3 13. Qxf3 Na5 14. Bd5 Rb8 15. Bxb8 Qxb8 16. Rab1 cxd4 17. cxd4 b6 18. Rfc1 e6 19. Bc6 a6 20. Ba4 b5 21. Bb3 Nxb3 22. Rxb3 b4 23. Rcb1 a5 24. a3 Rc8 25. axb4 a4 26. Ra3 Qb5 27. Qd1 e5 28. Qxa4 Qxa4 29. Rxa4 exd4 30. exd4 Bxd4 31. b5 Be5 32. b6 Rb8 33. b7 Kf8 34. Ra8 Ke8 35. Rxb8+ Bxb8 36. Rc1 1-0

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Brugman, Nico"]
[Result "0-1"]
[ECO "B66"]
[PlyCount "44"]
[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. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. f4 0-0 9. 0-0-0 a6 10. h4 h6 11. Qe2 Nxd4 12. Rxd4 b5 13. e5 Ne8 14. Qh5 f5 15. Rh3 Qc7 16. Rg3 dxe5 17. Bxe7 exd4 18. Bxf8 Qxf4+ 19. Kb1 Qxf1+ 20. Nd1 Kxf8 21. Rd3 e5 22. Qg6 Ra7 0-1

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Coerts, Marten"]
[Result "1/2-1/2"]
[ECO "B18"]
[PlyCount "62"]
[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 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. Bd3 Bxd3 8. Qxd3 Qc7 9. Qb3 Ngf6 10. 0-0 e6 11. Re1 0-0-0 12. a4 h5 13. Ng5 h4 14. Nf1 Bd6 15. Nxf7 Ng4 16. Qh3 Nxf2 17. Nxd6+ Qxd6 18. Kxf2 Rhf8+ 19. Kg1 Qxd4+ 20. Qe3 Qf6 21. Bd2 Nb6 22. Bc3 e5 23. Qh3+ Nd7 24. Nd2 Qf2+ 25. Kh1 g5 26. Rf1 Qc5 27. Rxf8 Rxf8 28. Rf1 Rxf1+ 29. Nxf1 Qf2 30. Qf3 Qxc2 31. h3 Qxa4 1/2-1/2

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Van der Sluijs, A."]
[Result "0-1"]
[ECO "E61"]
[PlyCount "81"]
[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 c5 2. Nc3 Nf6 3. Nf3 g6 4. d4 cxd4 5. Nxd4 Bg7 6. Bg5 0-0 7. e3 Qa5 8. Bh4 d6 9. Rc1 Bg4 10. f3 Bd7 11. Bd3 Nc6 12. Nde2 Rac8 13. Bb1 Ne5 14. b3 Nxf3+ 15. gxf3 Qh5 16. Bf2 Qxf3 17. Ng3 Qc6 18. h4 d5 19. Nce2 dxc4 20. Rxc4 Qa6 21. Rxc8 Rxc8 22. h5 Bg4 23. hxg6 fxg6 24. e4 Nh5 25. 0-0 Nxg3 26. Bxg3 Bxe2 27. Qd5+ e6 28. Qd7 Bxf1 29. Qxc8+ Bf8 30. Qd7 Bh3 31. Bd3 Qxa2 32. Bf2 Qd2 33. Qd8 Qd1+ 34. Kh2 Qg4 35. Bg3 h5 36. Qf6 Bg7 37. Qd8+ Kh7 38. Qe7 Kh6 39. Qh4 Qxh4 40. Bxh4 Bg4 41. Kg3 0-1

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Zaal, R."]
[Result "1-0"]
[ECO "B18"]
[PlyCount "51"]
[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 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. Bd3 Bxd3 8. Qxd3 Ngf6 9. 0-0 e6 10. Qb3 Qc7 11. Re1 Be7 12. Ng5 Nd5 13. Nxe6 fxe6 14. Rxe6 0-0-0 15. c4 N7f6 16. cxd5 Rxd5 17. h3 Bd6 18. Bd2 Rxd4 19. Bg5 Bxg3 20. fxg3 Nd5 21. Rae1 Rb4 22. Qf3 Qb6+ 23. Kh2 Rxb2 24. Qf7 Qf2 25. Re8+ Rxe8 26. Rxe8# 1-0

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1983.??.??"]
[Round "?"]
[White "Spaan, Tigran"]
[Black "Siekerman, Peter"]
[Result "1-0"]
[ECO "B13"]
[PlyCount "27"]
[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 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nc6 5. Nf3 Bf5 6. cxd5 Qxd5 7. Nc3 Qd8 8. d5 Nb8 9. Bf4 Nf6 10. Bb5+ Bd7 11. 0-0 Bxb5 12. Nxb5 Nxd5 13. Qxd5 Na6 14. Qxb7 1-0

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Broek, Thomas"]
[Black "Siekerman, Peter"]
[Result "0-1"]
[ECO "C15"]
[PlyCount "60"]
[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 e6 2. d4 d5 3. Nc3 Bb4 4. Bd2 Ne7 5. Qg4 Bxc3 6. Bxc3 Ng6 7. e5 Nd7 8. f4 Qh4+ 9. Qxh4 Nxh4 10. 0-0-0 c5 11. g3 Ng6 12. Nf3 c4 13. b3 b5 14. b4 Nb6 15. Bd2 Bd7 16. c3 a5 17. Kb1 axb4 18. cxb4 Ke7 19. Ne1 Ra7 20. Nc2 Rha8 21. a3 Ke8 22. h4 Ne7 23. g4 Nc6 24. Ka2 Nxd4 25. Be3 Nxc2 26. Bxb6 Nxb4+ 27. Kb2 Rxa3 28. Bc5 Ra2+ 29. Kc3 R8a3+ 30. Kxb4 Rb3# 0-1

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "De Jong, Huib"]
[Black "Siekerman, Peter"]
[Result "1/2-1/2"]
[ECO "A38"]
[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. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 0-0 5. d3 c5 6. Nf3 Nc6 7. 0-0 e6 8. Bf4 d5 9. Nb5 Ne8 10. cxd5 exd5 11. Qd2 a6 12. Nc3 Be6 13. Rac1 Rc8 14. Ng5 Nf6 15. Nxe6 fxe6 16. Bh3 Qe7 17. Bg5 Rce8 18. e4 Qf7 19. exd5 exd5 20. Bg2 Rd8 21. Na4 c4 22. d4 b5 23. Nc3 Rd7 24. Rce1 1/2-1/2

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Boots, Arie"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "55"]
[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 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Be7 6. Bd3 0-0 7. 0-0 Nbd7 8. f4 Nc5 9. Qf3 c6 10. Kh1 Qc7 11. Bd2 b5 12. e5 dxe5 13. Ndxb5 Qd7 14. fxe5 Ne8 15. Na3 Rb8 16. Nc4 Ba6 17. Nd6 Nxd6 18. exd6 Bxd6 19. Bxa6 Nxa6 20. Rad1 Qc7 21. Qg4 Rxb2 22. Bh6 Be5 23. Rf3 f5 24. Rxf5 Rxf5 25. Qxf5 gxh6 26. Qe6+ Kh8 27. Rf1 Kg7 28. Qg4+ 1-0

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Van der Veen, L."]
[Result "1/2-1/2"]
[ECO "B02"]
[PlyCount "34"]
[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 Nf6 2. e5 Nd5 3. Nc3 Nb6 4. d4 d6 5. f4 dxe5 6. fxe5 e6 7. Ne4 Qd5 8. Ng3 c5 9. Be3 cxd4 10. Bxd4 Nc6 11. Nf3 Nxd4 12. Qxd4 Bc5 13. Qxd5 Nxd5 14. 0-0-0 Bd7 15. Bd3 0-0-0 16. Ne4 Be7 17. Kb1 h6 1/2-1/2

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Siekerman, Peter"]
[Black "Van der Wakker, Peter"]
[Result "1-0"]
[ECO "C66"]
[PlyCount "29"]
[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 Nf6 4. 0-0 d6 5. Re1 Bd7 6. d4 exd4 7. Nxd4 Ne5 8. Bxd7+ Qxd7 9. Nc3 Be7 10. Nf5 0-0 11. Bg5 Rfe8 12. Bxf6 Bxf6 13. f4 Nc6 14. Qg4 Ne7 15. Nh6+ 1-0

[Event "Alkmaar op-A"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Van Egmond, Joost"]
[Black "Siekerman, Peter"]
[Result "1/2-1/2"]
[ECO "C16"]
[PlyCount "62"]
[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 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Ne7 5. Qg4 Nf5 6. Bd3 h5 7. Qf4 c5 8. Bxf5 exf5 9. Nf3 Be6 10. 0-0 Bxc3 11. bxc3 Nc6 12. Qg5 Qc7 13. Ba3 c4 14. Rab1 b6 15. Bd6 Qd7 16. a4 Qd8 17. Qxd8+ Kxd8 18. Ng5 Kd7 19. f4 Rag8 20. h4 Re8 21. Kf2 Reg8 22. Nf3 Re8 23. Rb2 Ra8 24. Nd2 Rag8 25. Rb5 Rc8 26. Nxc4 Nxd4 27. Nxb6+ axb6 28. cxd4 Rxc2+ 29. Kg1 Rc4 30. Rxb6 Rxa4 31. Rb7+ Kd8 1/2-1/2

