[Event "NED-chT 8182"]
[Site "Netherlands"]
[Date "1982.01.09"]
[Round "5"]
[White "Van der Wiel, John"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C91"]
[WhiteElo "2470"]
[BlackElo "2450"]
[PlyCount "80"]
[EventDate "1981.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2011"]
[Source "ChessBase"]
[SourceDate "2010.11.26"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.26"]
[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. d4 Bg4 10. Be3 exd4 11. cxd4 Na5 12. Bc2 c5 13. dxc5 dxc5 14. Nbd2 Qc7 15. Rc1 Rad8 16. h3 Bxf3 17. Qxf3 Nc6 18. Bb1 c4 19. Qe2 Bb4 20. b3 Ba3 21. bxc4 Bxc1 22. Rxc1 Nd4 23. Qe1 Rfe8 24. Kh1 b4 25. c5 Nb5 26. Nc4 Nxe4 27. Qxb4 Nbc3 28. Nd6 Ng3+ 29. fxg3 Rxe3 30. Nf5 Ne2 31. Nxe3 Nxg3+ 32. Kg1 Ne2+ 33. Kf1 Nxc1 34. Qe4 Qxc5 35. Qxh7+ Kf8 36. Qh8+ Ke7 37. Qh4+ g5 38. Qe1 Kf8 39. Kf2 Nd3+ 40. Bxd3 Rxd3 0-1

[Event "Van Welzenes 1st"]
[Site "Willemstad"]
[Date "1976.09.05"]
[Round "4"]
[White "Van Schoor, Karl"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "A12"]
[BlackElo "2445"]
[PlyCount "94"]
[EventDate "1976.09.02"]
[EventType "schev"]
[EventRounds "4"]
[EventCountry "AHO"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 c6 3. Bg2 d5 4. b3 Bf5 5. Nf3 e6 6. 0-0 Be7 7. Bb2 0-0 8. d3 h6 9. Nbd2 Bh7 10. Rc1 Nbd7 11. Rc2 Bd6 12. Bh3 Qe7 13. Qa1 Ba3 14. Ne5 Nxe5 15. Bxe5 Ne8 16. f4 a5 17. Nf3 a4 18. Qb1 axb3 19. axb3 Nc7 20. Ra2 Bd6 21. Rxa8 Rxa8 22. Qb2 Bxe5 23. Qxe5 f6 24. Qc3 Ra2 25. Re1 Qc5+ 26. Qd4 Qxd4+ 27. Nxd4 Kf7 28. cxd5 exd5 29. Bc8 c5 30. Rc1 Na6 31. Nb5 Rxe2 32. Bxb7 Nb4 33. Rxc5 Re1+ 34. Kg2 Bxd3 35. Rc7+ Re7 36. Rxe7+ Kxe7 37. Nc3 Kd6 38. Kf2 Bc2 39. Bc8 Bxb3 40. Ke3 Kc5 41. Ne2 Bd1 42. Nc1 d4+ 43. Kd2 Ba4 44. Be6 Nd5 45. h4 Ne3 46. Bh3 Kd5 47. Nd3 Bb5 0-1

[Event "Van Welzenes 1st"]
[Site "Willemstad"]
[Date "1976.09.04"]
[Round "3"]
[White "Zuidema, Coen"]
[Black "Boey, Josef Martin"]
[Result "1/2-1/2"]
[ECO "B28"]
[WhiteElo "2445"]
[BlackElo "2415"]
[PlyCount "90"]
[EventDate "1976.09.02"]
[EventType "schev"]
[EventRounds "4"]
[EventCountry "AHO"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 a6 3. c3 d5 4. exd5 Nf6 5. c4 e6 6. dxe6 Bxe6 7. d4 cxd4 8. Nxd4 Bc5 9. Be3 Ng4 10. Nxe6 Qxd1+ 11. Kxd1 Bxe3 12. fxe3 fxe6 13. Kd2 Nc6 14. Be2 0-0-0+ 15. Kc3 Nxe3 16. Bf3 Ne5 17. Be4 N3xc4 18. Re1 Nd6 19. Na3 b5 20. b3 Nxe4+ 21. Rxe4 Rd3+ 22. Kc2 Rd5 23. Rf1 Kd7 24. Kb1 Rc8 25. Nc2 Rd2 26. Nb4 a5 27. Rxe5 axb4 28. Rxb5 Rcc2 29. Rd1 Rb2+ 30. Kc1 Rxd1+ 31. Kxb2 Rd2+ 32. Kb1 Rxg2 33. Rxb4 Rxh2 34. Rb7+ Kd6 35. Rxg7 h5 36. a4 Kc5 37. a5 Kb5 38. Rg5+ Ka6 39. Re5 h4 40. b4 h3 41. Rxe6+ Kb5 42. a6 Rg2 43. a7 h2 44. Rh6 Rg8 45. Rxh2 Ra8 1/2-1/2

[Event "Van Welzenes 1st"]
[Site "Willemstad"]
[Date "1976.09.03"]
[Round "2"]
[White "Rooze, Jan"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "C90"]
[WhiteElo "2360"]
[BlackElo "2445"]
[PlyCount "81"]
[EventDate "1976.09.02"]
[EventType "schev"]
[EventRounds "4"]
[EventCountry "AHO"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[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 Nc6 12. Nf1 Qc7 13. Ne3 Re8 14. h3 Bf8 15. Nh2 Be6 16. Nhg4 Nd7 17. Bb3 Nb6 18. Qf3 Ne7 19. Qg3 Kh8 20. Bd2 Qd7 21. Rad1 f6 22. f4 exf4 23. Qxf4 d5 24. c4 Ng6 25. Qf3 bxc4 26. dxc4 dxe4 27. Qf2 Qf7 28. Bc3 Kg8 29. Nd5 Nxd5 30. cxd5 Bxg4 31. hxg4 Bd6 32. Bc2 Qc7 33. Rxe4 Rxe4 34. Bxe4 Re8 35. Bf5 Bg3 36. Qd2 Qd6 37. Be6+ Kh8 38. Rf1 Bh2+ 39. Kh1 Bf4 40. Qc2 Nf8 41. Qa4 1-0

[Event "Van Welzenes 1st"]
[Site "Willemstad"]
[Date "1976.09.02"]
[Round "1"]
[White "Zuidema, Coen"]
[Black "De Bruycker, Bernard"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "2445"]
[BlackElo "2370"]
[PlyCount "71"]
[EventDate "1976.09.02"]
[EventType "schev"]
[EventRounds "4"]
[EventCountry "AHO"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 a6 5. Nf3 b5 6. Bd3 c6 7. 0-0 Bg4 8. Be3 Qb6 9. Qe1 Bxf3 10. d5 Qa5 11. Rxf3 b4 12. Nd1 cxd5 13. exd5 Nf6 14. c4 bxc3 15. Nxc3 Nbd7 16. Bf2 Ng4 17. Bh4 0-0 18. Qxe7 Qb6+ 19. Kh1 Nc5 20. Qe2 Rab8 21. Rb1 Rfe8 22. Qd2 Qa5 23. h3 Nf6 24. f5 Nfd7 25. fxg6 hxg6 26. Bc2 Ne5 27. Rf2 Rb7 28. Bf6 Bxf6 29. Rxf6 Ncd7 30. Rf4 Rc8 31. Rh4 Nf6 32. Qh6 Nh5 33. Rxh5 gxh5 34. Bh7+ Kh8 35. Bf5+ Kg8 36. Ne4 1-0

[Event "EU-chT 06th Group1 NED-ENG"]
[Site "Vlissingen"]
[Date "1975.12.21"]
[Round "2.8"]
[White "Bellin, Robert"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C95"]
[PlyCount "86"]
[EventDate "1975.12.20"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]
[WhiteTeam "England"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ENG"]
[BlackTeamCountry "NED"]

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 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 c5 13. Nf1 Re8 14. Ng3 Bf8 15. a4 g6 16. d5 c4 17. Bg5 h6 18. Be3 Nc5 19. Qe2 Rb8 20. Nd2 Bc8 21. axb5 axb5 22. b4 cxb3 23. Nxb3 Nxb3 24. Bxb3 Nd7 25. Reb1 Qc7 26. Qd2 Kh7 27. Ra7 Rb7 28. Rxb7 Bxb7 29. Bc2 Ba6 30. Bd3 Rb8 31. Ra1 Bc8 32. Ra7 Rb7 33. Rxb7 Qxb7 34. Qb2 Qc7 35. Bxb5 Nc5 36. Qb1 Be7 37. Qd1 Bh4 38. Qf3 Bxg3 39. Qxg3 Nxe4 40. Qh4 Nxc3 41. Bc6 Ne2+ 42. Kh2 Nf4 43. g3 g5 1/2-1/2

[Event "EU-chT 06th Group1 NED-ENG"]
[Site "Vlissingen"]
[Date "1975.12.20"]
[Round "1.8"]
[White "Zuidema, Coen"]
[Black "Bellin, Robert"]
[Result "1-0"]
[ECO "B66"]
[PlyCount "85"]
[EventDate "1975.12.20"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "England"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "ENG"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. 0-0-0 h6 9. Be3 Bd7 10. f4 b5 11. Bd3 b4 12. Nce2 Qb8 13. Kb1 Qb7 14. Nf3 e5 15. h3 Be6 16. f5 Bd7 17. g4 Na7 18. Bxa7 Rxa7 19. Ng3 Be7 20. Rhe1 a5 21. Bc4 Qc6 22. b3 Bc8 23. g5 hxg5 24. Nxg5 Bf8 25. Qe3 Rc7 26. Qd3 Qc5 27. Rc1 Nh5 28. Nxh5 Rxh5 29. Qg3 Qa7 30. c3 Ba6 31. Bxa6 Qxa6 32. cxb4 Rxc1+ 33. Rxc1 axb4 34. Nxf7 Kxf7 35. Qg6+ Kg8 36. Qxh5 Qd3+ 37. Rc2 Qxe4 38. Qg4 Qe1+ 39. Rc1 Qd2 40. Rd1 Qh6 41. Qxb4 Qxh3 42. Qc4+ Kh8 43. Qe4 1-0

[Event "NED-SWE m"]
[Site "telex"]
[Date "1975.09.06"]
[Round "1.6"]
[White "Liljedahl, Lennart"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "A03"]
[PlyCount "80"]
[EventDate "1975.09.06"]
[EventType "team"]
[EventRounds "1"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Sweden"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "SWE"]
[BlackTeamCountry "NED"]

1. b3 d5 2. Bb2 c6 3. e3 Nf6 4. f4 g6 5. Nf3 Bg4 6. Be2 Bg7 7. 0-0 0-0 8. Qe1 Bxf3 9. Rxf3 e6 10. Rh3 Ne4 11. Bxg7 Kxg7 12. d3 Qf6 13. c3 Nd6 14. d4 Nd7 15. Bd3 c5 16. g4 Qe7 17. Nd2 Rac8 18. Nf3 Nf6 19. Qh4 Rh8 20. Qh6+ Kg8 21. Ne5 cxd4 22. cxd4 Nfe4 23. Rf1 Qf8 24. Qh4 Qd8 25. Qh6 Qf8 26. Qh4 h6 27. Bxe4 Nxe4 28. f5 gxf5 29. gxf5 Qg7+ 30. Qg4 Qxg4+ 31. Nxg4 h5 32. Ne5 Rh7 33. f6 Rh6 34. Rhf3 Kf8 35. Rf4 Ke8 36. Kh1 Rc3 37. R1f3 Rc1+ 38. Rf1 Rxf1+ 39. Rxf1 Rxf6 40. Rg1 Nf2+ 0-1

[Event "NED-chT"]
[Site "Netherlands"]
[Date "1975.??.??"]
[Round "?"]
[White "Zuidema, Coen"]
[Black "Ligterink, Gert"]
[Result "1-0"]
[ECO "B83"]
[PlyCount "71"]
[EventDate "1975.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 d6 6. Be2 Nf6 7. 0-0 Be7 8. f4 0-0 9. Be3 Bd7 10. Nb3 Qc7 11. Bf3 Rfd8 12. Qe1 Be8 13. Nb5 Qb8 14. c4 a6 15. Nc3 Nd7 16. Qe2 Nc5 17. Nd4 Rc8 18. Rac1 b5 19. Nxc6 Bxc6 20. Bxc5 dxc5 21. e5 Qb7 22. Bxc6 Qxc6 23. Rfd1 b4 24. Ne4 Rd8 25. Qf3 Kf8 26. f5 exf5 27. Qxf5 Kg8 28. Qf3 Kf8 29. Rf1 Qe6 30. Rc2 Kg8 31. Nd6 Bxd6 32. exd6 Ra7 33. Rd2 Rxd6 34. Qf4 Rad7 35. Rfd1 g5 36. Qxg5+ 1-0

[Event "Clare Benedict Cup-21"]
[Site "Cala Galdana"]
[Date "1974.05.??"]
[Round "?"]
[White "Zuidema, Coen"]
[Black "Whiteley, Andrew Jonathan"]
[Result "0-1"]
[ECO "C19"]
[PlyCount "50"]
[EventDate "1974.05.03"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "ESP"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7 7. Nf3 Ne7 8. a4 b6 9. Bb5+ Bd7 10. Bd3 Nbc6 11. 0-0 h6 12. Re1 0-0 13. Qd2 f5 14. exf6 Rxf6 15. dxc5 bxc5 16. Qe3 c4 17. Bf1 Raf8 18. Ba3 R8f7 19. Rad1 Qa5 20. Qc5 Qxc3 21. Bxc4 dxc4 22. Re3 Qxc2 23. Rxd7 Rxf3 24. gxf3 Qb1+ 25. Kg2 Rf5 0-1

[Event "Hoogovens M-4K"]
[Site "Wijk aan Zee"]
[Date "1974.01.20"]
[Round "3"]
[White "Zuidema, Coen"]
[Black "Barendregt, Johan"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "56"]
[EventDate "1974.01.18"]
[EventType "tourn"]
[EventRounds "3"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. Bc4 Be7 6. 0-0 c6 7. a4 Qc7 8. Re1 Nb6 9. Bf1 Bg4 10. Be3 0-0 11. h3 Bh5 12. Be2 Bg6 13. Nd2 d5 14. a5 Nbd7 15. exd5 Nxd5 16. Nxd5 cxd5 17. c4 exd4 18. Bxd4 Bf6 19. Bxf6 Nxf6 20. Bf3 Rad8 21. Qb3 dxc4 22. Qxc4 Qxc4 23. Nxc4 Rd4 24. Rac1 Be4 25. Bxe4 Nxe4 26. f3 Nc5 27. Re7 Rc8 28. Ne5 g6 1-0

[Event "Hoogovens M-4K"]
[Site "Wijk aan Zee"]
[Date "1974.01.19"]
[Round "2"]
[White "Cortlever, Nicolaas"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C01"]
[PlyCount "23"]
[EventDate "1974.01.18"]
[EventType "tourn"]
[EventRounds "3"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. exd5 exd5 5. Qf3 Qe7+ 6. Nge2 Nf6 7. Bg5 Nbd7 8. a3 Bxc3+ 9. Qxc3 c6 10. 0-0-0 Ne4 11. Bxe7 Nxc3 12. Nxc3 1/2-1/2

[Event "Hoogovens M-4K"]
[Site "Wijk aan Zee"]
[Date "1974.01.18"]
[Round "1"]
[White "Kerkmeester, Jan"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C95"]
[PlyCount "56"]
[EventDate "1974.01.18"]
[EventType "tourn"]
[EventRounds "3"]
[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. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. Nf1 Bf8 14. Ng3 g6 15. Be3 exd4 16. Bxd4 c5 17. Bxf6 Qxf6 18. Nh2 h5 19. Re3 Ne5 20. Nxh5 gxh5 21. Rg3+ Kh8 22. Qxh5+ Qh6 23. Qe2 f5 24. f4 Ng6 25. Ng4 Qxf4 26. Rf3 Qg5 27. Rxf5 Qxf5 28. exf5 Rxe2 0-1

[Event "NED-ch28 playoff"]
[Site "Leeuwarden"]
[Date "1973.09.15"]
[Round "6"]
[White "Zuidema, Coen"]
[Black "Enklaar, Bert F"]
[Result "1/2-1/2"]
[ECO "B85"]
[PlyCount "117"]
[EventDate "1973.09.10"]
[EventType "tourn"]
[EventRounds "6"]
[EventCountry "NED"]
[EventCategory "8"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 d6 6. Be2 Nf6 7. 0-0 Be7 8. Be3 0-0 9. f4 a6 10. Qe1 Nxd4 11. Bxd4 b5 12. a3 Bb7 13. Qg3 g6 14. Bd3 Rc8 15. Kh1 Re8 16. f5 e5 17. Be3 Qd7 18. Qh3 Rxc3 19. bxc3 Nxe4 20. c4 Rc8 21. cxb5 axb5 22. Rae1 Nc3 23. Qh6 Bf8 24. Qg5 Be7 25. f6 Bf8 26. Bf5 Qc6 27. Bxc8 Qxc8 28. Qh4 h5 29. Bd2 Qc6 30. Rf2 Na4 31. Bb4 Nb6 32. Re3 Nc4 33. Rg3 Qe4 34. Qxh5 Nxa3 35. Qg4 Nxc2 36. Qxe4 Bxe4 37. Rg4 Bd3 38. Bc3 e4 39. Rg3 d5 40. Rd2 b4 41. Rgxd3 exd3 42. Be5 d4 43. Rxd3 Bc5 44. Kg1 Kf8 45. Kf2 Ke8 46. Ke2 Kd7 47. Kd2 Ke6 48. Kxc2 Kxe5 49. Rf3 Ke4 50. h4 Bd6 51. Rb3 Be5 52. Rxb4 Bxf6 53. Rb7 Bxh4 54. Rxf7 Ke3 55. Kd1 g5 56. Rf3+ Ke4 57. Ke2 g4 58. Rf8 d3+ 59. Kd1 1/2-1/2

[Event "NED-ch28 playoff"]
[Site "Leeuwarden"]
[Date "1973.09.14"]
[Round "5"]
[White "Sosonko, Gennadi"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "E05"]
[PlyCount "77"]
[EventDate "1973.09.10"]
[EventType "tourn"]
[EventRounds "6"]
[EventCountry "NED"]
[EventCategory "8"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. c4 e6 4. Nc3 Be7 5. g3 0-0 6. Bg2 dxc4 7. 0-0 c5 8. dxc5 Nc6 9. Qa4 Qa5 10. Qxc4 Qxc5 11. Qxc5 Bxc5 12. Bf4 Bd7 13. Rac1 Rac8 14. Nb5 Na5 15. Bd6 Bxd6 16. Nxd6 Rc6 17. Rxc6 Bxc6 18. b4 Rd8 19. Nxf7 Kxf7 20. bxa5 Ke7 21. Rc1 a6 22. e3 Ne8 23. h4 Kf6 24. Nd4 Bxg2 25. Kxg2 Rd5 26. Nb3 Nd6 27. Rc7 Rb5 28. g4 h6 29. f4 g5 30. fxg5+ hxg5 31. h5 Nf7 32. Kg3 Nh6 33. Nc5 Rb4 34. e4 Rb1 35. Rh7 Nf7 36. Nd7+ Ke7 37. Ne5 Kf6 38. Nxf7 Rg1+ 39. Kf2 1-0

[Event "NED-ch28 playoff"]
[Site "Leeuwarden"]
[Date "1973.09.12"]
[Round "3"]
[White "Enklaar, Bert F"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C95"]
[PlyCount "102"]
[EventDate "1973.09.10"]
[EventType "tourn"]
[EventRounds "6"]
[EventCountry "NED"]
[EventCategory "8"]
[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 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. Nf1 Bf8 14. Ng3 g6 15. a4 c5 16. d5 c4 17. Bg5 h6 18. Be3 Nc5 19. Qd2 Kh7 20. Ra3 Rb8 21. Rea1 Bc8 22. axb5 axb5 23. Qc1 Re7 24. Ra7 Rxa7 25. Rxa7 Nfd7 26. Qa1 Qb6 27. Nd2 Rb7 28. Ra8 Qc7 29. Ne2 Nb6 30. Ra3 f5 31. f3 f4 32. Bf2 Nd3 33. b4 Nxf2 34. Kxf2 Be7 35. Ra6 Bd7 36. Nf1 Bd8 37. Ng1 Nc8 38. Ne2 Ra7 39. Ke1 Qb6 40. Rxa7 Nxa7 41. Qa5 Qxa5 42. bxa5 Bxa5 43. Nd2 h5 44. Kd1 Bb6 45. Bb1 Kh6 46. Ba2 Kg5 47. Ke1 Bc5 48. Kf1 Nc8 49. Ke1 Nb6 50. Kd1 Kh4 51. Kc2 Bxh3 0-1

[Event "NED-ch28 playoff"]
[Site "Leeuwarden"]
[Date "1973.09.11"]
[Round "2"]
[White "Zuidema, Coen"]
[Black "Sosonko, Gennadi"]
[Result "1/2-1/2"]
[ECO "B67"]
[PlyCount "95"]
[EventDate "1973.09.10"]
[EventType "tourn"]
[EventRounds "6"]
[EventCountry "NED"]
[EventCategory "8"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. 0-0-0 Bd7 9. f4 b5 10. Bxf6 gxf6 11. Nxc6 Bxc6 12. Qe3 Qe7 13. Bd3 h5 14. Rhf1 Bh6 15. Kb1 h4 16. Qh3 0-0-0 17. f5 Kb8 18. Ne2 Rdg8 19. fxe6 fxe6 20. Qxh4 Rxg2 21. Qxf6 Qxf6 22. Rxf6 Bg7 23. Rxe6 Be5 24. Ng3 Rgxh2 25. Nf1 Rh1 26. c3 Rg8 27. Ne3 Rxd1+ 28. Nxd1 Rg1 29. Kc2 Rg2+ 30. Kb3 Rd2 31. Bc2 a5 32. Ne3 Bf4 33. Nf5 a4+ 34. Ka3 Bd7 35. Re7 Bxf5 36. exf5 Rxc2 37. f6 d5 38. Re6 Bc1 39. Rb6+ Kc7 40. Rxb5 Kc6 41. Kxa4 Rf2 42. Rb8 Rxf6 43. Rc8+ Kb6 44. Rd8 Rf5 45. c4 dxc4 46. Kb4 Rf4 47. b3 Kc7 48. Rd1 1/2-1/2

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.28"]
[Round "11"]
[White "Boersma, Paul"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "A13"]
[PlyCount "84"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. 0-0 a6 7. Qxc4 b5 8. Qc6 Rb8 9. Qc2 c5 10. a4 Bb7 11. axb5 axb5 12. d4 Qb6 13. Nbd2 cxd4 14. Nb3 e5 15. Ng5 Bxg2 16. Kxg2 h6 17. Ne4 Qb7 18. f3 Nxe4 19. Na5 Qd5 20. fxe4 Qe6 21. Bd2 Bd6 22. Nb7 0-0 23. Qc6 Rfc8 24. Qxd6 Rxb7 25. Qxe6 fxe6 26. Rfc1 Rbc7 27. Rxc7 Rxc7 28. Ra8+ Kf7 29. Bb4 Nf6 30. Kf3 Rc2 31. Ra7+ Kg8 32. Ba3 b4 33. Bxb4 Rxb2 34. Bd6 Rb3+ 35. Kg2 Re3 36. Ra8+ Kh7 37. Ra7 Rxe2+ 38. Kh3 Rxe4 39. Bf8 Nh5 40. g4 Nf4+ 41. Kg3 Kg8 42. Bxg7 d3 0-1

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.26"]
[Round "10"]
[White "Zuidema, Coen"]
[Black "Van der Vliet, Fredrik"]
[Result "1/2-1/2"]
[ECO "B69"]
[PlyCount "120"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. 0-0-0 Bd7 9. f4 Be7 10. Nf3 b5 11. Bxf6 Bxf6 12. Qxd6 Be7 13. Qd2 b4 14. Na4 Ra7 15. Qe3 Qa5 16. b3 Rb7 17. Nd2 Na7 18. Nc4 Qc7 19. Ncb6 Bb5 20. e5 0-0 21. Bd3 Rfb8 22. Nc4 Bxa4 23. bxa4 Bc5 24. Qe4 g6 25. Kb1 Rd8 26. Be2 Rbb8 27. Nb2 a5 28. Bc4 Rxd1+ 29. Rxd1 Rd8 30. Rxd8+ Qxd8 31. Nd3 Bb6 32. g4 Qd4 33. Qxd4 Bxd4 34. a3 bxa3 35. Ka2 Kf8 36. Kxa3 h6 37. Kb3 Ke7 38. Bb5 g5 39. fxg5 hxg5 40. c4 Bg1 41. h3 Be3 42. c5 Kd8 43. Kc4 Bg1 44. Ne1 Bh2 45. Nf3 Bf4 46. Kd3 Bc1 47. Nd2 Bxd2 48. Kxd2 Kc7 49. Kd3 Kd8 50. Ke4 Nc8 51. Bc6 Ne7 52. Ba8 Ng6 53. Kd4 Nf4 54. Kc4 Kc7 55. Kb5 Nxh3 56. Bc6 Nf2 57. Be8 Nxg4 58. Bxf7 Nxe5 59. Bxe6 g4 60. Bd5 Nd7 1/2-1/2

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.25"]
[Round "9"]
[White "Van der Weide, Piet"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C25"]
[PlyCount "54"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. h4 g4 6. Ng5 h6 7. Nxf7 Kxf7 8. Bc4+ d5 9. Nxd5 Kg7 10. Nxf4 Nf6 11. d3 Bc5 12. Rf1 Ne5 13. Be6 g3 14. Qe2 Bf2+ 15. Rxf2 gxf2+ 16. Qxf2 Qe8 17. Bxc8 Qxc8 18. Bd2 Qg4 19. Bc3 Nfd7 20. Kd2 Raf8 21. Rf1 Kh7 22. d4 Ng6 23. g3 Nxf4 24. gxf4 Nf6 25. Kd3 Rhg8 26. d5 Qh3+ 27. Kd4 c5+ 0-1

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.24"]
[Round "8"]
[White "Zuidema, Coen"]
[Black "Henneberke, Frans"]
[Result "1-0"]
[ECO "B05"]
[PlyCount "55"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 c6 6. Ng5 Bxe2 7. Qxe2 dxe5 8. dxe5 e6 9. 0-0 Nd7 10. c4 Ne7 11. Nc3 h5 12. Nce4 Nf5 13. Rd1 Qc7 14. Bf4 Nc5 15. Nd6+ Bxd6 16. exd6 Qd7 17. b4 Na4 18. Re1 c5 19. b5 Kf8 20. Qc2 Nb6 21. Rad1 Nd4 22. Qd3 f6 23. Ne4 Rc8 24. Be3 e5 25. f4 f5 26. Nxc5 Rxc5 27. fxe5 Rxc4 28. Bxd4 1-0

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.23"]
[Round "7"]
[White "Van Baarle, John"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C78"]
[PlyCount "117"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Bb7 7. Re1 Bc5 8. c3 0-0 9. d4 Bb6 10. Bg5 h6 11. Bh4 Qe7 12. Nbd2 Kh8 13. dxe5 Nxe5 14. Nxe5 Qxe5 15. Nf3 Qf4 16. Bg3 Qg4 17. Ne5 Qxd1 18. Raxd1 Nxe4 19. Nxd7 Rfe8 20. Nxb6 cxb6 21. Bc7 f6 22. Bxb6 Nd2 23. Rxe8+ Rxe8 24. Bf7 Re7 25. Bg6 Be4 26. Bxe4 Rxe4 27. b3 Re6 28. Bd4 Ne4 29. f3 Nd6 30. Kf2 Kg8 31. Bc5 Nf7 32. Rd2 g5 33. Be3 Kg7 34. Rc2 Kg6 35. Rd2 h5 36. Rd5 Nd6 37. g3 g4 38. Bf4 Nf5 39. Rd8 Rc6 40. Rd3 Re6 41. Bd2 Rc6 42. Rd8 Re6 43. a3 Rc6 44. fxg4 hxg4 45. Ke2 Ng7 46. Rd4 f5 47. Rd3 Ne6 48. Be3 Ng5 49. Bxg5 Kxg5 50. Kd1 f4 51. gxf4+ Kxf4 52. Kc2 Rh6 53. Rd2 Rh3 54. Kb2 Ke3 55. Rg2 Kf3 56. Rc2 Ke4 57. c4 bxc4 58. Rxc4+ Kd5 59. Rxg4 1/2-1/2

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.21"]
[Round "6"]
[White "Zuidema, Coen"]
[Black "Enklaar, Bert F"]
[Result "1-0"]
[ECO "B85"]
[PlyCount "79"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 d6 6. Be2 Nf6 7. 0-0 Be7 8. Be3 0-0 9. f4 Bd7 10. Nb3 Qc7 11. Kh1 a6 12. a4 b6 13. Bf3 Rab8 14. Qe2 Na5 15. Nd2 Bc8 16. Bf2 Nd7 17. Rad1 Bf6 18. Ndb1 Bb7 19. Bd4 Rbc8 20. Bxf6 Nxf6 21. Na3 Rfd8 22. Qf2 e5 23. f5 Nc6 24. Nd5 Nxd5 25. exd5 Nd4 26. f6 gxf6 27. Bh5 Qe7 28. Rd3 Rc7 29. Bd1 Bc8 30. c3 Nf5 31. Rf3 Ng7 32. Rxf6 Ne8 33. Rh6 f5 34. g4 f4 35. Bc2 Qf8 36. Bxh7+ Kg7 37. Qh4 Qe7 38. Rg6+ Kf7 39. Qh6 Qf8 40. Bg8+ 1-0

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.20"]
[Round "5"]
[White "Zuidema, Coen"]
[Black "Scholl, Eddie C"]
[Result "1/2-1/2"]
[ECO "B93"]
[PlyCount "89"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 e5 7. Nf3 Nbd7 8. a4 Be7 9. Bc4 0-0 10. Qe2 b6 11. 0-0 Qc7 12. Kh1 Nc5 13. fxe5 dxe5 14. Bg5 Bb7 15. Bxf6 Bxf6 16. Bd5 Rac8 17. Bxb7 Qxb7 18. Nd5 Nd7 19. Rad1 Rfe8 20. Ne3 Nc5 21. Nd5 Nd7 22. Ne1 Re6 23. c3 Bd8 24. Nc2 Nf6 25. Ncb4 a5 26. Nxf6+ Rxf6 27. Rxf6 Bxf6 28. Nd5 Qc6 29. b3 Rb8 30. h3 h6 31. Qh5 Qe6 32. c4 Be7 33. Qf5 Bc5 34. Qxe6 fxe6 35. Nc7 Kf7 36. Rd7+ Be7 37. Kg1 Kf6 38. Kf2 g6 39. Ke2 Rc8 40. Nb5 Bc5 41. Nc3 Rf8 42. Rd3 Ke7 43. Rf3 Rd8 44. Nd1 h5 45. Rd3 1/2-1/2

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.19"]
[Round "4"]
[White "Sosonko, Gennadi"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "E02"]
[PlyCount "43"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Nf3 a6 7. Nc3 Rb8 8. Qxc4 b5 9. Qd3 Bb7 10. 0-0 Be7 11. Bf4 Rc8 12. Ne5 Bxg2 13. Kxg2 Nxe5 14. dxe5 Qxd3 15. exd3 Nd5 16. Nxd5 exd5 17. d4 Kd7 18. Rad1 Ke6 19. Be3 c5 20. f4 f5 21. exf6 Kxf6 22. dxc5 1/2-1/2

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.18"]
[Round "3"]
[White "Zuidema, Coen"]
[Black "Hartoch, Robert G"]
[Result "1/2-1/2"]
[ECO "B80"]
[PlyCount "61"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 a6 6. g3 d6 7. Bg2 Bd7 8. 0-0 Nf6 9. Re1 Be7 10. Nxc6 Bxc6 11. a4 0-0 12. a5 Nd7 13. Be3 Qc7 14. Na4 Rad8 15. Nb6 Rfe8 16. Qd2 Nf6 17. Qc3 Qb8 18. Bf4 Nh5 19. Be3 Nf6 20. Bf4 Nh5 21. Bd2 Nf6 22. Rad1 h6 23. Bf4 Nh5 24. Bc1 Nf6 25. Bf4 Nh5 26. Bc1 Nf6 27. b3 Nd7 28. Nxd7 Rxd7 29. Ba3 Red8 30. Qe3 Qc7 31. Bb4 1/2-1/2

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.17"]
[Round "2"]
[White "Van Scheltinga, Theo D"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C50"]
[PlyCount "45"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Bc5 5. Nc3 d6 6. Bg5 h6 7. Bxf6 Qxf6 8. Nd5 Qd8 9. c3 a6 10. d4 Ba7 11. h3 Be6 12. Bb3 0-0 13. 0-0 Re8 14. Re1 Na5 15. Bc2 c6 16. Ne3 Nc4 17. Nxc4 Bxc4 18. Bb3 Bxb3 19. Qxb3 Qb6 20. Qxb6 Bxb6 21. dxe5 dxe5 22. Rad1 Re7 23. Re2 1/2-1/2

[Event "NED-ch28"]
[Site "Leeuwarden"]
[Date "1973.04.16"]
[Round "1"]
[White "Zuidema, Coen"]
[Black "Marcus, Joost"]
[Result "1/2-1/2"]
[ECO "A03"]
[PlyCount "33"]
[EventDate "1973.04.16"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. b3 d5 2. Bb2 c5 3. e3 Nf6 4. f4 g6 5. Nf3 Bg7 6. Be2 0-0 7. 0-0 b6 8. Ne5 Bb7 9. Bf3 Nc6 10. Nxc6 Bxc6 11. Qe2 Qd7 12. d3 Ne8 13. Bxg7 Nxg7 14. c4 Rad8 15. Nc3 e6 16. g4 d4 17. Bxc6 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.02.03"]
[Round "15"]
[White "Tal, Mihail"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "D37"]
[PlyCount "79"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 Be7 5. Bf4 0-0 6. e3 c5 7. dxc5 Qa5 8. a3 dxc4 9. Bxc4 Qxc5 10. Qe2 a6 11. b4 Qh5 12. 0-0 b5 13. Bd3 Bb7 14. e4 Nbd7 15. h3 Rac8 16. Rac1 Nb6 17. Qe3 Nfd7 18. Ne2 f6 19. Bc7 Na8 20. Ba5 Ne5 21. Nxe5 Qxe5 22. Bb1 Bd6 23. f4 Qb2 24. Rcd1 Bb8 25. Kh2 f5 26. Rd2 Ba7 27. Nd4 Bxd4 28. Qxd4 Qxd4 29. Rxd4 fxe4 30. Bxe4 Bxe4 31. Rxe4 Rc6 32. Rfe1 Rf6 33. Bd8 Rf8 34. Be7 Re8 35. Bc5 Nc7 36. Rd4 Rc8 37. Rd7 Nd5 38. f5 Nf4 39. Re4 Nh5 40. Rxe6 1-0

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.02.01"]
[Round "14"]
[White "Zuidema, Coen"]
[Black "Enklaar, Bert F"]
[Result "1/2-1/2"]
[ECO "B79"]
[PlyCount "128"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 0-0 8. Qd2 Nc6 9. Bc4 Bd7 10. Bb3 Qa5 11. 0-0-0 Rfc8 12. Kb1 Ne5 13. Bg5 Rc5 14. Bxf6 Bxf6 15. Nd5 Qxd2 16. Nxf6+ Kg7 17. Nh5+ gxh5 18. Rxd2 a5 19. a4 Rac8 20. Rf1 Kf8 21. Re1 e6 22. f4 Nc4 23. Bxc4 Rxc4 24. b3 Rb4 25. Ka2 e5 26. fxe5 dxe5 27. Nf3 Be6 28. Nxe5 Rxa4+ 29. Kb2 Rb4 30. Nd3 Rd4 31. Rf2 Ke7 32. Nf4 Rc5 33. Nd5+ Kd6 34. Nf4 Re5 35. Rfe2 Kc6 36. c4 Bg4 37. Kc3 Rd8 38. Re3 h4 39. Nd5 Rg5 40. Rf1 Be6 41. Rf4 Rxg2 42. Rxh4 b5 43. Rxh7 bxc4 44. Nf4 Ra2 45. Nxe6 fxe6 46. Kxc4 Rdd2 47. Rh6 Rac2+ 48. Rc3 Kd6 49. h4 Ke5 50. Rxc2 Rxc2+ 51. Kd3 Rb2 52. Rh5+ Kf4 53. Kc3 Ra2 54. Rh6 e5 55. Kd3 Rb2 56. Rf6+ Kg4 57. Kc3 Re2 58. h5 Rxe4 59. h6 Re3+ 60. Kc4 Rh3 61. Ra6 e4 62. Kd4 Kf4 63. Rf6+ Kg5 64. Rb6 Kf5 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.31"]
[Round "13"]
[White "Ribli, Zoltan"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "C69"]
[PlyCount "51"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. 0-0 f6 6. d4 exd4 7. Nxd4 c5 8. Nb3 Qxd1 9. Rxd1 Bg4 10. f3 Bd7 11. Nc3 0-0-0 12. Bf4 c4 13. Na5 Bc5+ 14. Kh1 b5 15. Nd5 c6 16. b4 Ba7 17. Nc7 Bb8 18. Ne6 Bxf4 19. Nxc6 Bxe6 20. Nxd8 Bd7 21. Nf7 Ne7 22. Nxh8 Be6 23. a4 Be5 24. axb5 Bxa1 25. bxa6 Be5 26. Rd8+ 1-0

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.30"]
[Round "12"]
[White "Zuidema, Coen"]
[Black "Szabo, Laszlo"]
[Result "1/2-1/2"]
[ECO "C61"]
[PlyCount "14"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 exd4 5. 0-0 c6 6. Ba4 Nf6 7. c3 d5 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.29"]
[Round "11"]
[White "Balashov, Yuri S"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "C95"]
[PlyCount "89"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[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 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. Nf1 Bf8 14. Ng3 g6 15. Bd2 c5 16. d5 Bg7 17. b3 Nb6 18. Qc1 Bc8 19. a4 Qc7 20. Bd3 Bd7 21. a5 Nc8 22. b4 c4 23. Bc2 Kh8 24. Be3 Qd8 25. Qd2 Ng8 26. Nh2 Qh4 27. Nf3 Qe7 28. Rad1 Rf8 29. Nh2 f6 30. f4 Bh6 31. Nf3 exf4 32. Bxf4 Bxf4 33. Qxf4 Kg7 34. Nd4 Nh6 35. Ndf5+ Bxf5 36. exf5 Qa7+ 37. Kh2 Qf7 38. Re6 Ra7 39. fxg6 hxg6 40. Ne4 Ng8 41. Nxd6 Nxd6 42. Qxd6 Ne7 43. Rf1 Nc8 44. Qc5 Rd7 45. Rfxf6 1-0

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.28"]
[Round "10"]
[White "Zuidema, Coen"]
[Black "Planinc, Albin"]
[Result "1/2-1/2"]
[ECO "C16"]
[PlyCount "80"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 b6 5. a3 Bxc3+ 6. bxc3 Qd7 7. Qg4 f5 8. Qg3 Ba6 9. Bxa6 Nxa6 10. Ne2 0-0-0 11. a4 Nb8 12. a5 Nc6 13. axb6 cxb6 14. 0-0 h6 15. Qd3 Nge7 16. c4 dxc4 17. Qxc4 Kb8 18. Ba3 Nc8 19. Bb2 g5 20. Qb3 f4 21. c4 Rhf8 22. f3 Qb7 23. Rfd1 Rf7 24. d5 Na5 25. Qd3 Ne7 26. Rxa5 bxa5 27. Ba3 Ka8 28. Rb1 Qa6 29. Qe4 exd5 30. cxd5 Nxd5 31. Bd6 Qc6 32. Nc3 Rb7 33. Rxb7 Kxb7 34. Qxd5 Qxd5 35. Nxd5 Rc8 36. Ba3 Re8 37. Bd6 a4 38. Nf6 a3 39. Bxa3 Rxe5 40. Ne4 Kc6 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.27"]
[Round "9"]
[White "Zuidema, Coen"]
[Black "Ree, Hans"]
[Result "1/2-1/2"]
[ECO "B77"]
[PlyCount "42"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 0-0 8. Bb3 d6 9. f3 Bd7 10. Qd2 Nxd4 11. Bxd4 b5 12. 0-0 a5 13. a3 Rb8 14. Nd5 Nxd5 15. Bxg7 Kxg7 16. Bxd5 Be6 17. Qd4+ Kg8 18. Bxe6 fxe6 19. Rfd1 Qb6 20. Qxb6 Rxb6 21. Kf2 Rc8 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.24"]
[Round "8"]
[White "Hartoch, Robert G"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "D44"]
[PlyCount "79"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 c6 3. Nc3 d5 4. d4 e6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. Qf3 Bb7 12. Be2 Bh6 13. Bxf6 Nxf6 14. Qxf6 Qxf6 15. exf6 0-0-0 16. Rd1 b4 17. Na4 c5 18. Bxc4 Bxg2 19. Rg1 Bf3 20. Be2 Bxe2 21. Kxe2 cxd4 22. Rg4 e5 23. Nc5 Rd5 24. Ne4 Kd7 25. Rh4 Ra5 26. Ra1 Ke6 27. Kd3 Kf5 28. f3 Rd5 29. a3 b3 30. Rh5+ Kg6 31. Rh3 Kf5 32. Rg1 Rdd8 33. Rh5+ Ke6 34. Nc5+ Kxf6 35. Ke4 Bf4 36. Rf5+ Ke7 37. Rg7 Rdf8 38. Nxb3 Rxh2 39. Nxd4 exd4 40. Kxf4 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.23"]
[Round "7"]
[White "Zuidema, Coen"]
[Black "Ljubojevic, Ljubomir"]
[Result "1/2-1/2"]
[ECO "B93"]
[PlyCount "71"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 Nbd7 7. f4 Qb6 8. Bf3 g6 9. Nb3 Bg7 10. Qd3 0-0 11. Be3 Qc7 12. 0-0 Rb8 13. Ba7 Ra8 14. Bf2 Rb8 15. Ba7 Ra8 16. Bf2 Nb6 17. Nd2 Be6 18. Bd4 Rac8 19. Rf2 Ne8 20. Nd5 Bxd5 21. exd5 Na4 22. Bxg7 Nxg7 23. b3 Nc5 24. Qe2 b5 25. c3 Qb6 26. g3 Rfe8 27. Bg4 e6 28. dxe6 Ngxe6 29. Qf1 f5 30. Bf3 Kh8 31. Kg2 Nc7 32. Re2 d5 33. Rxe8+ Rxe8 34. Qf2 Qd6 35. Qd4+ Kg8 36. c4 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.22"]
[Round "6"]
[White "Hort, Vlastimil"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "A12"]
[PlyCount "46"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 c6 3. b3 d5 4. Bb2 Bf5 5. g3 e6 6. Bg2 Be7 7. 0-0 h6 8. d3 0-0 9. Nbd2 Bh7 10. Qc2 Nbd7 11. Rad1 Qb8 12. e4 dxe4 13. dxe4 a5 14. Rfe1 Nc5 15. Ne5 Rd8 16. Qc3 Ne8 17. Ba3 Qc7 18. Bxc5 Bxc5 19. Nd3 Bd4 20. Qc2 c5 21. Nf3 Nf6 22. Nf4 e5 23. Nxd4 Rxd4 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.19"]
[Round "5"]
[White "Zuidema, Coen"]
[Black "Andersson, Ulf"]
[Result "0-1"]
[ECO "C16"]
[PlyCount "88"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 b6 5. a3 Bf8 6. f4 Ne7 7. Be3 h5 8. Nf3 Qd7 9. Bf2 Nf5 10. Bd3 Ba6 11. Bxa6 Nxa6 12. Qd3 Nb8 13. Ne2 c5 14. b3 Nc6 15. c3 Rc8 16. 0-0 c4 17. bxc4 dxc4 18. Qb1 Nce7 19. a4 Nd5 20. Qb5 Rc6 21. Nd2 Nc7 22. Qb1 Be7 23. Ng3 Nd5 24. Ne2 a6 25. Ne4 h4 26. h3 Rc8 27. Kh2 Qc6 28. Be1 Rb8 29. Rf3 0-0 30. Nd2 b5 31. axb5 axb5 32. Bf2 Ra8 33. Rxa8 Rxa8 34. Ne4 Qa6 35. Ng1 Qa4 36. Nc5 Qa5 37. Ne4 g6 38. Qb2 Kg7 39. Qb1 Ra6 40. Nc5 Bxc5 41. dxc5 Nxc3 42. Qe1 Nd5 43. Bxh4 Qxe1 44. Bxe1 Nd4 0-1

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.18"]
[Round "4"]
[White "Vasiukov, Evgeni"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C95"]
[PlyCount "77"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[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 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. b4 Bf8 14. a4 d5 15. dxe5 Nxe4 16. Nxe4 dxe4 17. Bg5 f6 18. Bxe4 Bxe4 19. Rxe4 Nxe5 20. Rd4 Nxf3+ 21. Qxf3 Qc8 22. Be3 c5 23. Qd5+ Kh8 24. Rh4 cxb4 25. Qd3 h6 26. cxb4 bxa4 27. Rxa4 Re5 28. Rd4 Qe8 29. Ra1 Qb5 30. Qg6 Qe8 31. Qd3 Qb5 32. Qxb5 Rxb5 33. Bd2 Rab8 34. Ra4 R8b6 35. Rd8 Kg8 36. Kf1 Kf7 37. Rd7+ Ke6 38. Ra7 Bxb4 39. Bxb4 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.17"]
[Round "3"]
[White "Zuidema, Coen"]
[Black "Langeweg, Kick"]
[Result "1-0"]
[ECO "B47"]
[PlyCount "113"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. g3 a6 7. Bg2 Nf6 8. 0-0 Be7 9. Re1 Nxd4 10. Qxd4 Bc5 11. Qd1 d6 12. Be3 e5 13. Bxc5 Qxc5 14. Qd2 Be6 15. Rad1 Ke7 16. Re3 Rac8 17. Na4 Qc7 18. Rc3 Qb8 19. Nb6 Rc6 20. Rxc6 bxc6 21. Qa5 Qa7 22. c4 c5 23. b4 Qc7 24. bxc5 Qxc5 25. Qxa6 Rb8 26. Na4 Qc7 27. c5 dxc5 28. Nc3 Qb6 29. Qe2 Kf8 30. h3 c4 31. Kh2 Qa5 32. Qd2 Ke8 33. Qd6 Rc8 34. Nd5 Qc5 35. Qxe5 c3 36. Rc1 c2 37. Qf4 Nxd5 38. exd5 Bxd5 39. Qa4+ Ke7 40. Bxd5 Qxd5 41. Rxc2 Rxc2 42. Qxc2 h5 43. h4 g5 44. hxg5 Qxg5 45. Qe4+ Kf8 46. a4 Qc5 47. Qe3 Qb4 48. Qh6+ Kg8 49. Qg5+ Kf8 50. Qxh5 Qxa4 51. Qh8+ Ke7 52. Qh4+ Qxh4+ 53. gxh4 Kf6 54. Kg3 Kf5 55. Kf3 Kg6 56. Kg4 Kh6 57. h5 1-0

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.15"]
[Round "2"]
[White "Najdorf, Miguel"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "D59"]
[PlyCount "73"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 0-0 6. e3 h6 7. Bh4 b6 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Rc1 Be6 12. Qa4 Rc8 13. Bd3 c5 14. dxc5 bxc5 15. 0-0 Nd7 16. Qa3 Qf8 17. Ba6 Rcb8 18. b3 Rb4 19. h3 Qd6 20. Rfd1 Bf5 21. Bd3 Bxd3 22. Rxd3 a5 23. Qb2 a4 24. Qc2 axb3 25. axb3 Rab8 26. Rc3 Qf6 27. Qd1 Qd6 28. Ne1 d4 29. Nf3 Rd8 30. exd4 cxd4 31. Rc8 Rxc8 32. Rxc8+ Nf8 33. Qd3 g6 34. Nd2 Kg7 35. Ne4 Qe5 36. Rc5 Qb8 37. Rc4 1/2-1/2

[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1973.01.14"]
[Round "1"]
[White "Zuidema, Coen"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]
[ECO "B93"]
[PlyCount "45"]
[EventDate "1973.01.13"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[EventCategory "11"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 e5 7. Nf3 Nbd7 8. Bc4 b5 9. Bb3 Be7 10. Qe2 0-0 11. 0-0 Bb7 12. Kh1 Nc5 13. fxe5 Nfxe4 14. Nxe4 Bxe4 15. exd6 Qxd6 16. Bg5 Rae8 17. Rad1 Qg6 18. Bxe7 Rxe7 19. Bd5 Rfe8 20. Qf2 Bxd5 21. Rxd5 Ne4 22. Qd4 Nf6 23. Rg5 1/2-1/2

[Event "Amsterdam Seniors-Juniors"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "1"]
[White "Bouwmeester, Hans"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "D44"]
[PlyCount "80"]
[EventDate "1973.03.??"]
[EventType "team"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 c6 3. d4 Nf6 4. Nc3 e6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. Qf3 Bb7 12. Be2 Bh6 13. Bxh6 Rxh6 14. exf6 Qc7 15. Qe3 Rxh2 16. Rxh2 Qxh2 17. Ne4 0-0-0 18. 0-0-0 Nb6 19. g3 Nd5 20. Qg5 Qh7 21. Qe5 Nb4 22. a3 Qh6+ 23. f4 Rd5 24. Nd6+ Kd7 25. Nxf7 Qf8 26. axb4 Rxe5 27. dxe5+ Kc7 28. Nd6 c5 29. Nxb7 Kxb7 30. Rd7+ Kc8 31. Rxa7 Kb8 32. Ra5 cxb4 33. Rxb5+ Kc7 34. Bf3 c3 35. Rb7+ Kc8 36. Rb5 cxb2+ 37. Kxb2 Qd8 38. Bb7+ Kc7 39. Rxb4 Qd2+ 40. Kb3 Qd3+ 1/2-1/2

[Event "Netherlands"]
[Site "Netherlands"]
[Date "1973.??.??"]
[Round "?"]
[White "Zuidema, Coen"]
[Black "Kerkhoff, Leo"]
[Result "1-0"]
[ECO "C72"]
[PlyCount "89"]
[EventDate "1973.??.??"]
[EventType "game"]
[EventRounds "1"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. 0-0 Bg4 6. h3 h5 7. d4 b5 8. Bb3 Nxd4 9. hxg4 hxg4 10. Ng5 Nh6 11. f4 d5 12. Bxd5 Bc5 13. Be3 Qd6 14. Re1 0-0-0 15. b4 Nf3+ 16. Nxf3 Bxe3+ 17. Rxe3 Qb6 18. Nd4 exf4 19. Rc3 Nf5 20. Rc5 Ne3 21. Rc6 Nxd1 22. Rxb6 cxb6 23. Nd2 Ne3 24. Nc6 Rd6 25. Ne5 Rdh6 26. Kf2 Rh2 27. Rg1 Nxg2 28. Nxg4 Ne3+ 29. Nxh2 Rxh2+ 30. Ke1 Nxc2+ 31. Kd1 Ne3+ 32. Kc1 Nxd5 33. exd5 g6 34. Rg4 Rh5 35. Rxf4 Rxd5 36. Rxf7 Rd4 37. Rf6 Rxb4 38. Rxb6 Ra4 39. Kb2 g5 40. Nb3 g4 41. Rg6 g3 42. Rxg3 Rb4 43. Rg6 a5 44. Rd6 a4 45. Rd4 1-0

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.10.11"]
[Round "14"]
[White "Zuidema, Coen"]
[Black "Ribli, Zoltan"]
[Result "0-1"]
[ECO "B85"]
[PlyCount "62"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Hungary"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "HUN"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. 0-0 Be7 8. Be3 Qc7 9. f4 0-0 10. Bf3 Nc6 11. Qe2 Nxd4 12. Bxd4 e5 13. fxe5 dxe5 14. Bf2 b5 15. a3 Bb7 16. Kh1 Rac8 17. Rad1 Bxa3 18. Nxb5 axb5 19. bxa3 Qxc2 20. Qxb5 Nxe4 21. Bh4 Ba8 22. Qxe5 Nd2 23. Bxa8 Nxf1 24. Bf3 Rfe8 25. Qb5 Nd2 26. Bg4 Ne4 27. Qf1 Rb8 28. Rc1 Nd2 29. Qd1 Qxc1 30. Qxc1 Rb1 31. Qxb1 Nxb1 0-1

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.10.10"]
[Round "13"]
[White "Hug, Werner"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "D13"]
[PlyCount "23"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Switzerland"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "SUI"]
[BlackTeamCountry "NED"]

1. c4 Nf6 2. Nf3 c6 3. Nc3 d5 4. e3 Nbd7 5. cxd5 cxd5 6. d4 e6 7. Bd3 Bd6 8. 0-0 0-0 9. Bd2 a6 10. Rc1 e5 11. dxe5 Nxe5 12. Nxe5 1/2-1/2

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.10.09"]
[Round "12"]
[White "Zuidema, Coen"]
[Black "Ghitescu, Theodor"]
[Result "1/2-1/2"]
[ECO "B82"]
[PlyCount "114"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Romania"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "ROU"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 Nbd7 7. Bd3 e6 8. 0-0 Nc5 9. Nb3 Nxd3 10. Qxd3 Be7 11. Kh1 0-0 12. Be3 b5 13. a3 Bb7 14. Rad1 Rc8 15. Bd4 Qc7 16. e5 dxe5 17. Bxe5 Qc6 18. Qe2 Ba8 19. Rd3 g6 20. Nd4 Qb7 21. Rg3 Nd7 22. f5 Nxe5 23. Qxe5 Rc5 24. Qe3 Bd6 25. Rg4 exf5 26. Nxf5 Rxf5 27. Rxf5 Qd7 28. Qg5 h6 29. Qf6 Kh7 30. Rd4 Qxf5 31. Qxf5 gxf5 32. Rxd6 Rg8 33. Rd2 Rg5 34. Kg1 f4 35. b3 f3 36. g3 h5 37. Kf2 h4 38. Nd5 hxg3+ 39. hxg3 Rg6 40. c4 bxc4 41. bxc4 Rc6 42. Rd4 Kg7 43. g4 Rh6 44. a4 Rh2+ 45. Kxf3 Ra2 46. Kf4 Bb7 47. Nb6 Bc6 48. Ke5 f6+ 49. Ke6 Bxa4 50. Nxa4 Rxa4 51. Rd7+ Kg6 52. Kd5 a5 53. Ra7 Ra2 54. c5 a4 55. c6 a3 56. c7 Rc2 57. Kd6 Rd2+ 1/2-1/2

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.10.07"]
[Round "10"]
[White "Rubinetti, Jorge Alberto"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C95"]
[PlyCount "106"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Argentina"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ARG"]
[BlackTeamCountry "NED"]

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 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. Nf1 Bf8 14. Ng3 g6 15. Bd2 c5 16. d5 Bg7 17. Qc1 Kh8 18. Bg5 Qe7 19. Nh2 Qf8 20. Ng4 Ng8 21. h4 h5 22. Nh2 Nb6 23. Qd1 f6 24. Be3 Bh6 25. Nhf1 Bc8 26. Bd3 Bd7 27. Qd2 Bxe3 28. Nxe3 Qh6 29. f3 Qf4 30. Kf2 Qxh4 31. Rh1 Qg5 32. Rh2 Re7 33. Rah1 Rh7 34. Rh4 Rf8 35. Qd1 Ne7 36. Nef5 Nbc8 37. R1h2 Be8 38. Ne3 Nb6 39. Qh1 Rff7 40. Be2 Rfg7 41. Ngf1 f5 42. Nd2 f4 43. Nd1 Ng8 44. Bd3 c4 45. Bc2 Qd8 46. Ke2 Nf6 47. Nf2 Bd7 48. Nf1 g5 49. Rxh5 Nxh5 50. Rxh5 Qe8 51. Rh6 Kg8 52. Ng4 Bxg4 53. fxg4 Nd7 0-1

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.10.04"]
[Round "8"]
[White "Medina Garcia, Antonio Angel"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C90"]
[PlyCount "100"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Spain"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ESP"]
[BlackTeamCountry "NED"]

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 Nc6 12. Nf1 Re8 13. Bg5 h6 14. Bh4 Nd7 15. Bg3 Bf6 16. a4 Nb6 17. axb5 axb5 18. Rxa8 Nxa8 19. Ne3 Nb6 20. Bb3 Na5 21. Ba2 Be6 22. Qa1 Qa8 23. Bxe6 Rxe6 24. Qa2 Re7 25. Nf5 Ra7 26. Qb1 Qc6 27. Nd2 Bg5 28. Nf1 g6 29. h4 gxf5 30. hxg5 hxg5 31. exf5 f6 32. Ne3 Nb3 33. Qd1 Ra1 34. Qe2 Rxe1+ 35. Qxe1 Nd5 36. Ng4 Kg7 37. Qd1 c4 38. f3 Nc7 39. Ne3 Nd5 40. Nc2 Nc5 41. d4 Na4 42. Qa1 Ne7 43. Ne3 exd4 44. cxd4 Qb6 45. Bf2 d5 46. Qa3 Kf7 47. Qb4 Nc6 48. Qd6 Ne7 49. Qb4 Nc6 50. Qd6 Ne7 1/2-1/2

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.10.02"]
[Round "6"]
[White "Zuidema, Coen"]
[Black "Benko, Pal C"]
[Result "1/2-1/2"]
[ECO "B84"]
[PlyCount "148"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "United States"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "USA"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 7. f4 Qc7 8. 0-0 Be7 9. Be3 0-0 10. Qe1 b5 11. Bf3 Bb7 12. e5 Ne8 13. Qg3 Nd7 14. Rad1 b4 15. Bxb7 Qxb7 16. Nce2 Nc5 17. exd6 Nxd6 18. f5 Nce4 19. Qe1 e5 20. Nb3 Rac8 21. c3 Nc4 22. Bc1 Rfd8 23. Rxd8+ Rxd8 24. Ng3 Qb6+ 25. Kh1 Nxg3+ 26. Qxg3 a5 27. cxb4 axb4 28. Qf3 Qa6 29. Qe2 Qc6 30. Na1 h6 31. b3 Nd6 32. Nc2 Qe4 33. Qxe4 Nxe4 34. g3 Ra8 35. Ne1 Rxa2 36. Nd3 f6 37. Be3 Re2 38. Re1 Rxe1+ 39. Nxe1 Bc5 40. Bxc5 Nxc5 41. Nc2 Nxb3 42. Nxb4 Nd4 43. g4 h5 44. h3 Kh7 45. Kg2 Kh6 46. Kg3 Kg5 47. h4+ Kh6 48. Nd5 hxg4 49. Kxg4 g6 50. fxg6 f5+ 51. Kh3 Kxg6 52. Kg3 Nc6 53. Kh3 Nd8 54. Kg3 Nf7 55. Kh3 Nh6 56. Kg3 Ng4 57. Kh3 Kf7 58. h5 Ke6 59. Nc3 Nh6 60. Kh4 Nf7 61. Ne2 Kf6 62. Nc3 Kg7 63. Nd5 Kh6 64. Ne7 Nd6 65. Ng8+ Kg7 66. Ne7 Kf7 67. Nd5 Ke6 68. Nc7+ Kd7 69. Nd5 Nf7 70. Nc3 Ke6 71. Ne2 Kd5 72. h6 Nxh6 73. Kg5 Ke4 74. Kxh6 f4 1/2-1/2

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.09.30"]
[Round "4"]
[White "Ljubojevic, Ljubomir"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "A03"]
[PlyCount "37"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Yugoslavia"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "YUG"]
[BlackTeamCountry "NED"]

1. f4 d5 2. Nf3 Nf6 3. e3 c5 4. b3 Nc6 5. Bb5 Bd7 6. Bb2 e6 7. 0-0 Be7 8. a4 0-0 9. Ne5 Nxe5 10. fxe5 Ne8 11. Bd3 Bc6 12. Qg4 g6 13. Nc3 Ng7 14. Rf4 c4 15. bxc4 dxc4 16. Rxc4 Qa5 17. Ne4 Bxe4 18. Qxe4 Nf5 19. Bc3 1-0

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.09.29"]
[Round "3"]
[White "Zuidema, Coen"]
[Black "Smyslov, Vassily V"]
[Result "1/2-1/2"]
[ECO "C87"]
[PlyCount "66"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Soviet Union"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "URS"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. 0-0 Nf6 6. c3 Be7 7. d4 0-0 8. Nbd2 Bd7 9. Re1 exd4 10. cxd4 Nb4 11. Bxd7 Qxd7 12. Qb3 a5 13. a3 Na6 14. Nc4 a4 15. Qc2 d5 16. exd5 Nxd5 17. Ne3 Nxe3 18. Bxe3 Rfe8 19. Rac1 Bf6 20. Red1 Qb5 21. Nd2 Re6 22. Ne4 Qe8 23. Nxf6+ Rxf6 24. d5 h6 25. Rd4 Rd8 26. Bf4 Qb5 27. Rcd1 Re8 28. Be3 Rd6 29. h3 Red8 30. Qxa4 Qxa4 31. Rxa4 Rxd5 32. Rad4 Rxd4 33. Rxd4 Rxd4 1/2-1/2

[Event "Olympiad-20 Final A"]
[Site "Skopje"]
[Date "1972.09.27"]
[Round "1"]
[White "Pfleger, Helmut"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "D59"]
[PlyCount "83"]
[EventDate "1972.09.27"]
[EventType "team-tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "German Fed Rep"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 0-0 6. e3 h6 7. Bh4 b6 8. Bd3 Bb7 9. cxd5 Nxd5 10. Bxe7 Qxe7 11. Nxd5 Bxd5 12. 0-0 Nd7 13. Rc1 c5 14. e4 Bb7 15. Qe2 Rac8 16. Ba6 Nf6 17. dxc5 Rxc5 18. Rxc5 Bxa6 19. Qxa6 Qxc5 20. e5 Nd7 21. Re1 Qd5 22. h3 Ra8 23. b4 b5 24. a4 bxa4 25. Qxa4 Nb6 26. Qa5 Nc4 27. Qxd5 exd5 28. Ra1 Re8 29. Rxa7 Nxe5 30. Nxe5 Rxe5 31. Ra8+ Kh7 32. Ra1 Kg6 33. Rb1 Kf5 34. b5 Re7 35. Kf1 Ke5 36. b6 Rb7 37. Ke2 Kd4 38. Rb4+ Kc5 39. Rg4 g6 40. Rh4 h5 41. Rf4 Kxb6 42. g4 1/2-1/2

[Event "Olympiad-20 Preliminaries G"]
[Site "Skopje"]
[Date "1972.09.25"]
[Round "7"]
[White "Zuidema, Coen"]
[Black "Berrios, Angel"]
[Result "1/2-1/2"]
[ECO "C86"]
[PlyCount "21"]
[EventDate "1972.09.18"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Puerto Rico"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "PUR"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Be7 7. Qe2 d6 8. c3 0-0 9. d4 Bd7 10. Rd1 Qc8 11. Nbd2 1/2-1/2

[Event "Olympiad-20 Preliminaries G"]
[Site "Skopje"]
[Date "1972.09.23"]
[Round "5"]
[White "Zuidema, Coen"]
[Black "Taha, Ahmed"]
[Result "1-0"]
[ECO "C14"]
[PlyCount "75"]
[EventDate "1972.09.18"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Iraq"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "IRQ"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 0-0 8. Nf3 c5 9. Bd3 f5 10. exf6 Nxf6 11. dxc5 Qxc5 12. Qd2 Nc6 13. 0-0-0 Bd7 14. Kb1 a5 15. Rhe1 a4 16. a3 Rfb8 17. Nb5 Na5 18. Nbd4 b5 19. Qb4 Qxb4 20. axb4 Nc4 21. b3 axb3 22. cxb3 Nd6 23. Kb2 Nfe4 24. Ne5 Bc8 25. Ndc6 Rb7 26. Bxe4 g5 27. Bb1 gxf4 28. Rf1 Rg7 29. Rd2 Bb7 30. Rxf4 Rc8 31. Nd4 Rg5 32. Nef3 Rh5 33. Nxe6 Ne4 34. Bxe4 dxe4 35. Nfg5 e3 36. Rd7 Rxg5 37. Nxg5 Re8 38. Nxh7 1-0

[Event "Olympiad-20 Preliminaries G"]
[Site "Skopje"]
[Date "1972.09.22"]
[Round "4"]
[White "Zuidema, Coen"]
[Black "Fuller, Maxwell L"]
[Result "1-0"]
[ECO "B09"]
[PlyCount "74"]
[EventDate "1972.09.18"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Australia"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "AUS"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Nf6 5. Nf3 0-0 6. Bd3 Nc6 7. e5 dxe5 8. fxe5 Nh5 9. Be3 Bg4 10. Be2 f6 11. exf6 exf6 12. 0-0 f5 13. h3 Bxf3 14. Bxf3 Ng3 15. Bd5+ Kh8 16. Rf3 Ne4 17. Bxe4 fxe4 18. Rxf8+ Qxf8 19. Qd2 Rd8 20. Ne2 Qd6 21. c3 Rf8 22. Bf4 Qd7 23. Qe3 Re8 24. Rf1 b5 25. Bh6 Bxh6 26. Qxh6 Kg8 27. Ng3 Qd5 28. Qf4 e3 29. b3 Qd7 30. Ne4 Qe7 31. Nf6+ Kg7 32. Nxe8+ Qxe8 33. Re1 e2 34. d5 Nd8 35. Qxc7+ Nf7 36. Qxa7 Kg8 37. Qf2 Qe5 1-0

[Event "Olympiad-20 Preliminaries G"]
[Site "Skopje"]
[Date "1972.09.20"]
[Round "2"]
[White "Cuartas, Carlos Enrique"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "C45"]
[PlyCount "129"]
[EventDate "1972.09.18"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Columbia"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "COL"]
[BlackTeamCountry "NED"]

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. Nd2 Nb4 10. Nf3 c5 11. Bf4 Qe6 12. Qe4 Qc6 13. Qxc6 Nxc6 14. 0-0-0 h6 15. h4 0-0-0 16. b3 Be7 17. g3 Bb7 18. Bg2 Rhe8 19. Rhe1 Nd4 20. Nxd4 Bxg2 21. Nb5 g5 22. hxg5 hxg5 23. Be3 Kb7 24. f4 a6 25. Nc3 gxf4 26. Bxf4 d6 27. exd6 Bxd6 28. Rxe8 Bxf4+ 29. gxf4 Rxe8 30. Rd7 f6 31. Nd5 Bxd5 32. Rxd5 Kc6 33. Kb2 Re4 34. Rf5 Re6 35. Ka3 a5 36. Ka4 Kb6 37. a3 c6 38. b4 axb4 39. axb4 cxb4 40. Kxb4 Kc7 41. Kc5 Rd6 42. Rh5 Re6 43. Rh7+ Kd8 44. f5 Re5+ 45. Kxc6 Rxf5 46. c5 Rf1 47. Rd7+ Ke8 48. Kc7 f5 49. c6 f4 50. Kc8 Re1 51. c7 f3 52. Rd8+ Ke7 53. Kb7 Rb1+ 54. Ka7 Ra1+ 55. Kb6 Rb1+ 56. Ka5 Ra1+ 57. Kb4 Rb1+ 58. Ka3 f2 59. c8Q Ra1+ 60. Kb2 Rb1+ 61. Kxb1 f1Q+ 62. Kc2 Qg2+ 63. Rd2 Qe4+ 64. Kb3 Qb1+ 65. Rb2 1-0

[Event "Olympiad-20 Preliminaries G"]
[Site "Skopje"]
[Date "1972.09.19"]
[Round "1"]
[White "Calderon, D."]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "E38"]
[PlyCount "58"]
[EventDate "1972.09.18"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "YUG"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]
[WhiteTeam "Andorra"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "AND"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. Qc2 0-0 6. Bg5 cxd4 7. Nxd4 Nc6 8. e3 Nxd4 9. exd4 b6 10. Bd3 h6 11. Bh4 Bb7 12. 0-0 Be7 13. a3 d5 14. c5 bxc5 15. dxc5 Bxc5 16. Bxf6 gxf6 17. Ne2 Bd6 18. Qd2 Kg7 19. f4 Rg8 20. f5 e5 21. Rf3 Kh7 22. Rh3 Rg5 23. Rf1 e4 24. Bb1 Be5 25. Rb3 Ba6 26. Rd1 Rb8 27. Nc1 Rxb3 28. Nxb3 Qb6+ 29. Nd4 Bd3 0-1

[Event "Clare Benedict Cup-19"]
[Site "Vienna"]
[Date "1972.05.24"]
[Round "5.1"]
[White "Zuidema, Coen"]
[Black "Huebner, Robert"]
[Result "0-1"]
[ECO "B80"]
[PlyCount "76"]
[EventDate "1972.05.20"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "AUT"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "German Fed Rep"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "GER"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bd3 Be7 7. 0-0 Nc6 8. Nb3 Ne5 9. Be2 0-0 10. f4 Ng6 11. Bd3 b6 12. Qf3 Bb7 13. Bd2 Nd7 14. Qh3 Bf6 15. Rae1 a6 16. Nd1 a5 17. c3 a4 18. Nd4 e5 19. Ne2 Nc5 20. f5 Ne7 21. Nf2 d5 22. Ng3 dxe4 23. Ngxe4 Bxe4 24. Bxe4 Qxd2 25. Bxa8 Rxa8 26. Ng4 Kh8 27. Nxe5 Qxb2 28. Nxf7+ Kg8 29. Qf3 Rf8 30. Nd6 Qxa2 31. Rb1 Qd2 32. Rxb6 Qxc3 33. Qe2 Qd3 34. Qxd3 Nxd3 35. Nb5 Ra8 36. Rd6 Nc5 37. g4 a3 38. Rfd1 Nxf5 0-1

[Event "Clare Benedict Cup-19"]
[Site "Vienna"]
[Date "1972.05.23"]
[Round "4.1"]
[White "Pomar Salamanca, Arturo"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "E43"]
[PlyCount "84"]
[EventDate "1972.05.20"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "AUT"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]
[WhiteTeam "Spain"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ESP"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Nf3 Bb7 6. Bd3 0-0 7. Qc2 d5 8. a3 Bxc3+ 9. bxc3 dxc4 10. Bxc4 c5 11. a4 Nc6 12. Ba3 Na5 13. Be2 Qc7 14. 0-0 Rfd8 15. Rfd1 cxd4 16. Nxd4 a6 17. c4 Rac8 18. Rac1 h6 19. c5 bxc5 20. Qxc5 Qxc5 21. Bxc5 Nc6 22. Rb1 Ne4 23. Rdc1 Nxd4 24. Bxd4 Nd2 25. Rxc8 Rxc8 26. Rd1 Ne4 27. h3 a5 28. Rb1 Bd5 29. Bd3 f6 30. Rb5 Rc1+ 31. Kh2 Nxf2 32. Bg6 Rh1+ 33. Kg3 Ne4+ 34. Kh4 Kf8 35. Rxa5 Rb1 36. Ra7 Rb7 37. a5 Rxa7 38. Bxa7 Bb7 39. a6 Bc6 40. Bb6 Ke7 41. Ba5 f5 42. Bc7 Kf6 1/2-1/2

[Event "Clare Benedict Cup-19"]
[Site "Vienna"]
[Date "1972.05.22"]
[Round "3.1"]
[White "Zuidema, Coen"]
[Black "Lombard, Andre"]
[Result "0-1"]
[ECO "B15"]
[PlyCount "56"]
[EventDate "1972.05.20"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "AUT"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Switzerland"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "SUI"]

1. e4 c6 2. d4 d5 3. Nc3 g6 4. Nf3 Bg7 5. e5 Bg4 6. h3 Bxf3 7. Qxf3 Qb6 8. Ne2 e6 9. b3 Nd7 10. Bb2 Ne7 11. h4 h5 12. g3 c5 13. c3 Rc8 14. Qd3 Nc6 15. f4 Bf8 16. Bh3 cxd4 17. Nxd4 Nc5 18. Qb5 Qxb5 19. Nxb5 Nd3+ 20. Kd2 Nxb2 21. Kc2 a6 22. Nd6+ Bxd6 23. exd6 Nb4+ 24. Kxb2 Nd3+ 25. Kc2 Nf2 26. Rh2 Ne4 27. Kb2 Rxc3 28. Bg2 Rc6 0-1

[Event "Clare Benedict Cup-19"]
[Site "Vienna"]
[Date "1972.05.21"]
[Round "2.1"]
[White "Dueckstein, Andreas"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C44"]
[PlyCount "70"]
[EventDate "1972.05.20"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "AUT"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]
[WhiteTeam "Austria"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "AUT"]
[BlackTeamCountry "NED"]

1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d4 Nxe4 5. d5 Nb8 6. Bd3 Nc5 7. Nxe5 Nxd3+ 8. Nxd3 d6 9. Qf3 Be7 10. 0-0 0-0 11. Be3 Nd7 12. Bd4 Bf6 13. Nd2 Bxd4 14. cxd4 Nf6 15. h3 b6 16. Nb4 Bb7 17. Rac1 Qd7 18. Nc6 Rfe8 19. Rc3 Ba6 20. Rfc1 Be2 21. Qg3 Nxd5 22. Ra3 a5 23. Qb3 Qf5 24. Qc2 Qxc2 25. Rxc2 Bb5 26. Nf3 Kf8 27. Rc1 f6 28. Rb3 Nf4 29. Rxb5 Ne2+ 30. Kh2 Nxc1 31. d5 Kf7 32. Nfd4 g6 33. Ne6 Rxe6 34. dxe6+ Kxe6 35. Nd4+ Kd7 0-1

[Event "Clare Benedict Cup-19"]
[Site "Vienna"]
[Date "1972.05.20"]
[Round "1.1"]
[White "Keene, Raymond"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "A07"]
[PlyCount "146"]
[EventDate "1972.05.20"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "AUT"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]
[WhiteTeam "England"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ENG"]
[BlackTeamCountry "NED"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. 0-0 Bf5 5. d3 e6 6. Nbd2 Be7 7. Qe1 h6 8. e4 Bh7 9. Qe2 0-0 10. e5 Nfd7 11. Re1 c5 12. Nf1 Nc6 13. h4 Rc8 14. Bf4 Re8 15. N1h2 f5 16. c4 g5 17. Be3 d4 18. Bc1 g4 19. Nd2 Ndxe5 20. Bxc6 Nxc6 21. Qxe6+ Kg7 22. Nb3 Bf6 23. Nxc5 Ne5 24. Rxe5 Bxe5 25. Qxh6+ Kg8 26. Bg5 Qc7 27. b4 Bxg3 28. Nf1 Be5 29. Bf6 Bf4 30. Bg5 Be5 31. Bf6 Bf4 32. Bg5 Bxg5 33. Qxg5+ Qg7 34. Qxg7+ Kxg7 35. Nxb7 Rb8 36. Nd6 Red8 37. c5 Rxb4 38. Ng3 Kf6 39. Nh5+ Ke6 40. Nf4+ Kd7 41. Nd5 Ra4 42. Nf6+ Kc6 43. Nxh7 Rh8 44. Ng5 Rxh4 45. Rc1 g3 46. fxg3 Rg4 47. Nf3 Rxg3+ 48. Kf2 f4 49. Rc2 Rg8 50. Nf5 Rd8 51. Ne7+ Kd7 52. Ng6 Kc6 53. Nxf4 Re8 54. Ne2 Rf8 55. Kg3 Rg8+ 56. Kf2 Rf8 57. Nc1 Kd5 58. Nb3 Rf6 59. Ke2 Rfa6 60. Nfxd4 Rxa2 61. Kd2 Rxc2+ 62. Nxc2 Ra4 63. Kc3 Rh4 64. Nb4+ Ke6 65. d4 Rh3+ 66. Kc4 Rh4 67. Kb5 Kd7 68. d5 Rg4 69. Na5 Rd4 70. Nac6 a6+ 71. Kxa6 Rd1 72. Kb5 Kc7 73. Ne5 Rd2 1-0

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.04.08"]
[Round "11"]
[White "Zuidema, Coen"]
[Black "Timman, Ton"]
[Result "1-0"]
[ECO "C16"]
[PlyCount "109"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Qd7 5. a3 Bxc3+ 6. bxc3 b6 7. Nh3 Ba6 8. Bxa6 Nxa6 9. Qg4 f5 10. Qh5+ g6 11. Qh4 h6 12. g4 Qf7 13. Rg1 Nb8 14. gxf5 Qxf5 15. Nf4 g5 16. Qh5+ Kd7 17. Ne2 Nc6 18. Rxg5 hxg5 19. Qxh8 Qf3 20. Kf1 Rf8 21. Be3 Nge7 22. Qg7 Rf5 23. Ng3 Qxe3 24. Nxf5 Qh3+ 25. Kg1 Qxf5 26. Re1 Na5 27. Re3 Nc4 28. Rd3 Qg4+ 29. Rg3 Qd1+ 30. Kg2 Nd2 31. Kh3 Ne4 32. Rxg5 Qf3+ 33. Rg3 Nxf2+ 34. Kh4 Qf4+ 35. Kh5 Ne4 36. Rg2 Qf5+ 37. Kh4 Qf4+ 38. Kh5 a5 39. h4 Qf5+ 40. Kh6 Qf4+ 41. Kh5 Nxc3 42. Rg4 Qf5+ 43. Rg5 Qf3+ 44. Kh6 Ne2 45. c3 Qxc3 46. Qf7 Qe3 47. Kg7 Nxd4 48. Kf8 Qf3 49. Qxf3 Nxf3 50. Rg7 Nxh4 51. Rxe7+ Kd8 52. Rxe6 Nf5 53. Kf7 d4 54. Re8+ Kd7 55. e6+ 1-0

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.04.06"]
[Round "10"]
[White "Scholl, Eddie C"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "A07"]
[PlyCount "64"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. 0-0 Bf5 5. b3 e6 6. Bb2 Be7 7. d3 0-0 8. Nc3 h6 9. h3 Nbd7 10. Nd2 Nc5 11. e4 Bh7 12. e5 Ne8 13. Qe2 a5 14. a4 Na6 15. f4 Nb4 16. Nf3 c5 17. Ne1 c4 18. dxc4 dxc4 19. bxc4 Qb6+ 20. Kh1 Nxc2 21. Nxc2 Qxb2 22. Ne4 Bxe4 23. Bxe4 Rc8 24. Rab1 Qc3 25. Rxb7 Qxc4 26. Qxc4 Rxc4 27. Bd3 Rc3 28. Rf3 Rc7 29. Rb8 Rc5 30. Nd4 Nc7 31. Rxf8+ Kxf8 32. Nb3 Rd5 1/2-1/2

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.04.05"]
[Round "9"]
[White "Zuidema, Coen"]
[Black "Timman, Jan H"]
[Result "1/2-1/2"]
[ECO "B09"]
[PlyCount "113"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Nf6 5. Nf3 c5 6. e5 Ng4 7. Bb5+ Bd7 8. e6 Bxb5 9. exf7+ Kd7 10. Nxb5 Qa5+ 11. Nc3 cxd4 12. Nxd4 Bxd4 13. Qxg4+ Qf5 14. Qf3 Qe6+ 15. Ne2 Nc6 16. Rf1 Rhf8 17. f5 gxf5 18. Qxf5 Qxf5 19. Rxf5 Bf6 20. Bg5 Bxg5 21. Rxg5 Rxf7 22. 0-0-0 Raf8 23. Ng3 Rf2 24. Rd2 Rxd2 25. Kxd2 Rf2+ 26. Kc3 Rxg2 27. Rh5 b5 28. Rxh7 d5 29. a3 a5 30. Nf5 Rf2 31. Nd4 b4+ 32. axb4 axb4+ 33. Kd3 Ne5+ 34. Ke3 Ng4+ 35. Kd3 Kd6 36. h3 Nf6 37. Ke3 Rh2 38. Rh6 Kc5 39. Kd3 Rf2 40. Ke3 Rh2 41. Nf5 e6 42. Rxf6 exf5 43. c3 Rxh3+ 44. Kd2 bxc3+ 45. bxc3 Rf3 46. Ke2 Rf4 47. Ke3 Re4+ 48. Kd2 f4 49. Kd3 Ra4 50. Rh6 Ra2 51. Rf6 Rf2 52. Rf8 Kd6 53. c4 Rf3+ 54. Ke2 Re3+ 55. Kd2 Re4 56. cxd5 Kxd5 57. Rd8+ 1/2-1/2

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.04.04"]
[Round "8"]
[White "Kuijpers, Frans"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "E14"]
[PlyCount "112"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2 d5 5. e3 0-0 6. Bd3 b6 7. 0-0 Bb7 8. b3 Ne4 9. Qc2 f5 10. Ne5 Nd7 11. Nxd7 Qxd7 12. Nf3 Bd6 13. Ne5 Qe8 14. f3 Nc5 15. Be2 Nd7 16. Bb2 c5 17. cxd5 exd5 18. Bb5 Bxe5 19. dxe5 a6 20. Be2 Rf7 21. f4 Nf8 22. Bh5 g6 23. Bf3 Ne6 24. Rad1 Rd8 25. h3 d4 26. Bxb7 Rxb7 27. exd4 cxd4 28. Rd3 Rc7 29. Qf2 Qb5 30. Rfd1 Rcd7 31. Kh2 Qd5 32. g3 Qe4 33. R3d2 h5 34. h4 Kf7 35. Ba3 Rc8 36. Bd6 Rc3 37. Re2 Re3 38. Rde1 Rxe2 39. Rxe2 Qd5 40. Qg2 Qxg2+ 41. Kxg2 Rd8 42. Rc2 Ke8 43. Rc6 d3 44. Rc1 Nc5 45. Rd1 Ne4 46. Rxd3 Kf7 47. b4 Ke6 48. Ra3 Nxd6 49. exd6 Rxd6 50. Rxa6 Kd5 51. a4 Ke4 52. a5 Rd2+ 53. Kh3 bxa5 54. bxa5 Kf3 55. Rb6 Ra2 56. a6 Ra1 1/2-1/2

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.04.03"]
[Round "7"]
[White "Zuidema, Coen"]
[Black "Enklaar, Bert F"]
[Result "1-0"]
[ECO "C18"]
[PlyCount "83"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Ba5 6. b4 cxd4 7. Nb5 Bc7 8. f4 Ne7 9. Nf3 0-0 10. Bd3 f6 11. 0-0 Bb6 12. Bb2 a6 13. Nbxd4 Nbc6 14. Kh1 f5 15. c4 Bd7 16. c5 Ba7 17. Qe2 Qe8 18. Rfc1 Qh5 19. Bc3 Nxd4 20. Bxd4 Qg4 21. g3 Ba4 22. Rab1 Bb8 23. Qe3 Nc6 24. Rb2 h6 25. Rg1 Bc7 26. h3 Qh5 27. Rh2 Ne7 28. g4 Qf7 29. Rhg2 Kh8 30. gxf5 Nxf5 31. Bxf5 Qxf5 32. Nh4 Qf7 33. Ng6+ Kh7 34. Nxf8+ Rxf8 35. f5 Rg8 36. fxe6 Qxe6 37. Rg6 Qxg6 38. Rxg6 Kxg6 39. Qd3+ Kf7 40. Qf5+ Ke7 41. Qh7 Kf8 42. c6 1-0

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.04.01"]
[Round "6"]
[White "Hartoch, Robert G"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "A07"]
[PlyCount "85"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 c6 3. Bg2 Nf6 4. 0-0 Bf5 5. b3 e6 6. d3 Be7 7. Bb2 0-0 8. Nbd2 h6 9. e3 Bh7 10. Qe2 a5 11. a3 Nbd7 12. e4 Qb6 13. Rab1 Qa6 14. e5 Ne8 15. Rfe1 Nc7 16. Bf1 b5 17. h4 c5 18. Nh2 a4 19. Rbc1 b4 20. axb4 cxb4 21. Ng4 Rfc8 22. Ne3 a3 23. Ba1 Qb6 24. Bh3 Ra7 25. Nf3 Rd8 26. g4 Nb5 27. g5 hxg5 28. hxg5 Nf8 29. Kh2 Bc5 30. Ng4 Ng6 31. Qd2 Kf8 32. d4 Be7 33. Nf6 gxf6 34. gxf6 Bxf6 35. exf6 Ke8 36. Qxb4 Qd6+ 37. Qxd6 Nxd6 38. Ng5 Nf8 39. Bg2 Rc7 40. c4 dxc4 41. bxc4 Nxc4 42. d5 Bf5 43. Rc3 1/2-1/2

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.03.31"]
[Round "5"]
[White "Zuidema, Coen"]
[Black "Ree, Hans"]
[Result "1-0"]
[ECO "B80"]
[PlyCount "95"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bd3 Nc6 7. Nb3 a6 8. a4 b6 9. 0-0 Bb7 10. f4 Be7 11. Qf3 0-0 12. Qh3 Re8 13. Kh1 Bf8 14. Bd2 Nd7 15. e5 g6 16. Ne4 f5 17. exf6 Nxf6 18. Ng5 Qd7 19. Bc3 Nd5 20. Bxg6 Re7 21. Nxh7 Rxh7 22. Bxh7+ Qxh7 23. Qxe6+ Qf7 24. Qg4+ Bg7 25. Bxg7 Qxg7 26. Qe6+ Qf7 27. Qg4+ Qg7 28. Qxg7+ Kxg7 29. Rae1 Rf8 30. f5 Bc8 31. g4 Ne5 32. h3 Rh8 33. Kg2 Nc4 34. Kg3 Nxb2 35. Re4 b5 36. axb5 axb5 37. Nd4 Bd7 38. Ne6+ Kf7 39. Nf4 Nc3 40. Re3 Nbd1 41. Ree1 Nb2 42. Ng6 Re8 43. Rxe8 Bxe8 44. Re1 Bc6 45. Re7+ Kf6 46. Rc7 Ne4+ 47. Kf4 Bd5 48. h4 1-0

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.03.30"]
[Round "4"]
[White "Bohm, Hans"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C15"]
[PlyCount "102"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd3 dxe4 5. Bxe4 Nf6 6. Bf3 Nc6 7. Nge2 e5 8. Bxc6+ bxc6 9. 0-0 0-0 10. Bg5 h6 11. Bh4 exd4 12. Nxd4 Qd6 13. a3 Bxc3 14. bxc3 Nd5 15. Qf3 Qc5 16. Rfe1 Qc4 17. Re5 Bd7 18. Qd3 Qxd3 19. cxd3 f6 20. Ree1 Nxc3 21. Rac1 Rfe8 22. Kf1 c5 23. Nb3 Rxe1+ 24. Kxe1 Re8+ 25. Kd2 Ne2 26. Rxc5 Nf4 27. Bg3 Re2+ 28. Kd1 Ba4 29. Bxf4 Rxf2 30. Bxc7 Bxb3+ 31. Ke1 Rxg2 32. Ra5 g5 33. Rxa7 f5 34. Be5 Bf7 35. a4 f4 36. h4 f3 37. hxg5 Re2+ 38. Kf1 Rxe5 39. gxh6 Bd5 40. a5 Rh5 41. Rd7 Rh1+ 42. Kf2 Rh2+ 43. Kf1 Be6 44. Rg7+ Kh8 45. Rg3 Bd5 46. Rg5 Bb7 47. Rf5 Rxh6 48. Rf7 Bd5 49. Rf5 Bc6 50. Kg1 Kg7 51. a6 Rf6 0-1

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.03.29"]
[Round "3"]
[White "Zuidema, Coen"]
[Black "Van den Berg, Ad"]
[Result "1-0"]
[ECO "B45"]
[PlyCount "77"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. exd5 exd5 10. Bd3 0-0 11. 0-0 d4 12. Ne2 Ng4 13. b4 a6 14. h3 Nge5 15. Bb2 Bxh3 16. gxh3 Nf3+ 17. Kh1 Qh4 18. Ng1 Nxg1 19. Kxg1 Qxh3 20. Be4 Rad8 21. Qf3 Qh4 22. Qh1 Qg5+ 23. Qg2 Qh4 24. Qh1 Qg5+ 25. Qg2 Qh4 26. Rad1 f5 27. Bd5+ Kh8 28. Rd3 Rd6 29. Re1 Qd8 30. c4 Rff6 31. Rg3 f4 32. Rg4 Rg6 33. Bf7 f3 34. Rxg6 Rxg6 35. Qxg6 hxg6 36. Re8+ Qxe8 37. Bxe8 Ne5 38. c5 d3 39. Bxe5 1-0

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.03.28"]
[Round "2"]
[White "Langeweg, Kick"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "D30"]
[PlyCount "32"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 c6 3. e3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. d4 e6 7. Bd3 Bd6 8. 0-0 0-0 9. b3 a6 10. Bb2 b5 11. a4 b4 12. Ne2 a5 13. Rc1 Ba6 14. Rc6 Nb8 15. Rc2 Qb6 16. Ne5 Ra7 1/2-1/2

[Event "NED-ch27"]
[Site "Leeuwarden"]
[Date "1972.03.27"]
[Round "1"]
[White "Van Dop, Arend J"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C15"]
[PlyCount "120"]
[EventDate "1972.03.27"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "4"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd3 dxe4 5. Bxe4 Nf6 6. Bf3 c5 7. Nge2 Nc6 8. Be3 cxd4 9. Nxd4 Bxc3+ 10. bxc3 Ne5 11. 0-0 Nxf3+ 12. Nxf3 Qxd1 13. Rfxd1 b6 14. Ne5 Bb7 15. a4 Nd5 16. a5 f6 17. Nc4 Ba6 18. Nd6+ Ke7 19. Nf5+ Kf7 20. c4 Nxe3 21. Nxe3 Ke7 22. axb6 axb6 23. f4 Rhb8 24. Ra3 Bb7 25. Rb3 Be4 26. Rb2 Rd8 27. Rxd8 Rxd8 28. Rxb6 h6 29. h4 Ra8 30. Kh2 Ra3 31. Rb3 Ra5 32. Kg3 g5 33. fxg5 hxg5 34. hxg5 Rxg5+ 35. Kf2 Rc5 36. g3 Rc8 37. Rb6 f5 38. Ra6 Rh8 39. c5 Rh2+ 40. Kf1 Bxc2 41. Ra7+ Kd8 42. c6 Be4 43. c7+ Kc8 44. Nc4 Bb7 45. Kg1 Rg2+ 46. Kf1 Rxg3 47. Kf2 Rb3 48. Ra3 Rxa3 49. Nxa3 Ba6 50. Ke3 Kxc7 51. Nc2 Kd6 52. Nb4 Bc8 53. Nd3 e5 54. Nf2 Ba6 55. Nh3 Bb7 56. Nf2 f4+ 57. Kd3 Ke6 58. Ng4 Bf3 59. Nh2 Bh5 60. Ke4 Be2 0-1

[Event "NED Team-ch"]
[Site "Netherlands"]
[Date "1972.??.??"]
[Round "?"]
[White "Van Weezel, Chr"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "D47"]
[PlyCount "102"]
[EventDate "1972.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 b4 9. Ne2 c5 10. 0-0 Bb7 11. Ng3 Be7 12. a3 0-0 13. axb4 cxd4 14. exd4 Bxb4 15. Ba6 Bd5 16. Bf4 Nb8 17. Bd3 Nc6 18. Ne5 Qb6 19. Bg5 Nxe5 20. dxe5 Nd7 21. Nh5 Nxe5 22. Bxh7+ Kh8 23. Bb1 f5 24. Nf4 Bc4 25. Qh5+ Kg8 26. Rd1 Rac8 27. Nh3 Bb3 28. Rf1 a5 29. Be3 Qc7 30. Bd4 Qf7 31. Qh4 Ng4 32. Ng5 Qg6 33. Qxg4 Bc4 34. Qf4 Bxf1 35. Kxf1 Rc4 36. Nf3 Qg4 37. Qxg4 Rc1+ 38. Ke2 fxg4 39. Nd2 g6 40. Bc3 Rb8 41. Bxb4 axb4 42. Nb3 Rh1 43. Bxg6 Rxh2 44. Be4 Rh5 45. Ra6 Re5 46. f3 gxf3+ 47. gxf3 Rc8 48. Kd3 Kf7 49. Rb6 Rd8+ 50. Kc2 Ra8 51. Rxb4 Kf6 1-0

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.26"]
[Round "11"]
[White "Minic, Dragoljub"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C95"]
[PlyCount "81"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[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 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. b4 Bf8 14. a4 c6 15. Bb2 Rc8 16. axb5 cxb5 17. d5 Nb6 18. Bb3 Nh5 19. g3 g6 20. Rc1 Bh6 21. Rc2 Rc7 22. Kg2 Nc4 23. Bc1 Qd7 24. Nxc4 bxc4 25. Ba4 Qxa4 26. Bxh6 f6 27. g4 Ng7 28. Kh2 Ra8 29. Rb2 Qxd1 30. Rxd1 Ne8 31. Be3 f5 32. Bb6 fxe4 33. Ng5 Rd7 34. Nxe4 h6 35. Be3 Kg7 36. f4 Nc7 37. Rbd2 exf4 38. Bxf4 Nb5 39. Rf1 g5 40. Be3 Rf7 41. Bd4+ 1/2-1/2

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.24"]
[Round "10"]
[White "Zuidema, Coen"]
[Black "Kurajica, Bojan"]
[Result "0-1"]
[ECO "B08"]
[PlyCount "92"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Nf3 d6 5. Be2 Nf6 6. 0-0 0-0 7. Re1 Qc7 8. Bf4 Nh5 9. Be3 e5 10. a4 Bg4 11. Qd2 Nf6 12. Rad1 Nbd7 13. dxe5 dxe5 14. Qd6 Qxd6 15. Rxd6 Rfe8 16. h3 Bxf3 17. Bxf3 Bf8 18. Rd2 Bb4 19. g4 Re7 20. g5 Ne8 21. Red1 Nb6 22. Rd8 Rxd8 23. Rxd8 Nc4 24. Bxa7 Nxb2 25. Na2 Ba5 26. Ra8 b6 27. Nc1 Kg7 28. Nb3 Nc7 29. Rc8 Ne6 30. Nxa5 bxa5 31. Be3 Rc7 32. Rxc7 Nxc7 33. Bg4 Nxa4 34. Bd7 Ne6 35. Bxc6 Nc3 36. Kf1 Nd4 37. Bd7 Nxc2 38. Bd2 Nxe4 39. Bxa5 Nxg5 40. Bc3 f6 41. Kg2 Ne4 42. Ba5 Nc5 43. Bc6 Nd4 44. Ba8 Nce6 45. Bb4 Nf4+ 46. Kg3 Nf5+ 0-1

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.23"]
[Round "9"]
[White "Van der Weide, Piet"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C25"]
[PlyCount "74"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. h4 g4 6. Ng5 d6 7. d4 h6 8. Nxf7 Kxf7 9. Bxf4 Nf6 10. Qd2 Qe7 11. 0-0-0 Nxe4 12. Nxe4 Qxe4 13. Bc4+ Kg7 14. Rhf1 Qg6 15. Rde1 Bf5 16. d5 Ne7 17. Re6 Bxe6 18. dxe6 Kg8 19. h5 Qxh5 20. Be3 Bg7 21. Rf7 Rh7 22. Bd3 Bxb2+ 23. Kxb2 Rxf7 24. exf7+ Kxf7 25. Qb4 Nc6 26. Qc4+ Ke7 27. Bd2 Qc5 28. Qxg4 Qd4+ 29. Qxd4 Nxd4 30. Bxh6 Rg8 31. Bf1 Nf5 32. Bd2 Ke6 33. Kc3 Rg3+ 34. Kb2 Ne3 35. Bd3 Nxg2 36. Be4 d5 37. Bh7 Ne3 0-1

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.21"]
[Round "8"]
[White "Zuidema, Coen"]
[Black "Kort, Jacob"]
[Result "1-0"]
[ECO "C72"]
[PlyCount "79"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. 0-0 Bd7 6. d4 Nge7 7. d5 Nb8 8. c4 Ng6 9. Bc2 Be7 10. Nc3 Bg4 11. h3 Bc8 12. Be3 Nd7 13. Qd2 Nf6 14. Kh2 h5 15. Ne1 Nf4 16. Bxf4 exf4 17. Qxf4 Ng4+ 18. Kg1 Ne5 19. Nd3 Nxc4 20. e5 Nxe5 21. Nxe5 dxe5 22. Qxe5 Kf8 23. Ne4 f5 24. Nc3 Bf6 25. Qe3 g6 26. Ne2 Kg7 27. Nf4 Bg5 28. Rfe1 Qd6 29. Qc3+ Bf6 30. Qf3 Bd7 31. Rad1 Be5 32. Ne6+ Kf6 33. Bb3 a5 34. a4 Ra6 35. Re2 g5 36. Rde1 g4 37. Qd3 Bxe6 38. Rxe5 Bd7 39. Re6+ Bxe6 40. Rxe6+ 1-0

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.20"]
[Round "7"]
[White "Ghitescu, Theodor"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "D55"]
[PlyCount "79"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 e6 3. d4 d5 4. Nc3 Be7 5. Bg5 0-0 6. e3 h6 7. Bxf6 Bxf6 8. Qd2 b6 9. 0-0-0 dxc4 10. Bxc4 Bb7 11. Qe2 Qe7 12. e4 e5 13. dxe5 Bxe5 14. Nd5 Bxd5 15. Rxd5 Nc6 16. Kb1 Qf6 17. Bb3 Rad8 18. Rc1 Nd4 19. Nxd4 Bxd4 20. Rxc7 Rxd5 21. Bxd5 a5 22. f3 Qd6 23. Rc4 Bc5 24. g3 Kh8 25. Rc1 Qe7 26. f4 Rd8 27. Rd1 f6 28. a3 Qe8 29. Bb3 Rxd1+ 30. Bxd1 g6 31. Bc2 Kg7 32. Qd3 h5 33. h3 Qe6 34. Bb3 Qe8 35. Qd5 Kh6 36. g4 hxg4 37. hxg4 Qe7 38. e5 fxe5 39. Qh1+ Kg7 40. g5 1-0

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.19"]
[Round "6"]
[White "Zuidema, Coen"]
[Black "Enklaar, Bert F"]
[Result "1-0"]
[ECO "B42"]
[PlyCount "80"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5 6. Nb3 Ba7 7. 0-0 Ne7 8. Qe2 Nbc6 9. Be3 Bxe3 10. Qxe3 0-0 11. N1d2 e5 12. Nc4 d5 13. exd5 Nxd5 14. Qc5 Nf4 15. Be4 Qg5 16. g3 Be6 17. Kh1 Nh3 18. Bg2 Rad8 19. Rae1 Qf6 20. Nxe5 Nxe5 21. Rxe5 Nxf2+ 22. Kg1 Rd1 23. Rxd1 Nxd1 24. Re1 Bxb3 25. Rxd1 b6 26. Qc7 Bxa2 27. b3 a5 28. Qd7 Qc3 29. Qc6 Qe3+ 30. Kh1 g6 31. Bd5 Qf2 32. Qc4 b5 33. Qxb5 Qxc2 34. Rf1 Qc7 35. Qa4 Qd8 36. Rd1 Qg5 37. Qxa2 Rd8 38. Qd2 Qxd2 39. Rxd2 Kg7 40. Rd3 Rb8 1-0

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.17"]
[Round "5"]
[White "Smejkal, Jan"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "A12"]
[PlyCount "115"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 c6 3. b3 d5 4. Bb2 Bf5 5. d3 Nbd7 6. g3 h6 7. Bg2 e6 8. 0-0 Be7 9. Nbd2 0-0 10. Qc2 Bh7 11. Bc3 Qb8 12. Qb2 Bd6 13. e4 dxe4 14. Nxe4 Bxe4 15. dxe4 e5 16. Nh4 b5 17. Qe2 b4 18. Bb2 Re8 19. Rad1 Bf8 20. f4 Qb6+ 21. Kh1 Rad8 22. Nf5 Re6 23. Bh3 Ne8 24. Ne3 Re7 25. Nf5 Re6 26. Ne3 Re7 27. fxe5 Nxe5 28. Nf5 Re6 29. Ne3 Re7 30. c5 Qc7 31. Nf5 Re6 32. Nd6 Re7 33. Nf5 Re6 34. Rxd8 Qxd8 35. Nd6 Rxd6 36. cxd6 Bxd6 37. Qa6 Qc7 38. Rc1 c5 39. Bxe5 Bxe5 40. Qb5 Qe7 41. Qxc5 Bd6 42. Qd4 Nf6 43. Rc6 Be5 44. Qc5 Qxc5 45. Rxc5 Bd6 46. Rc6 Be5 47. Rc4 Bd6 48. Rc6 Be5 49. Rc8+ Kh7 50. Kg2 g5 51. Kf3 h5 52. Bf5+ Kg7 53. h3 Ng8 54. Rc4 Bd6 55. Rd4 Be7 56. e5 Bf8 57. Ke4 Ne7 58. Rd7 1-0

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.16"]
[Round "4"]
[White "Zuidema, Coen"]
[Black "Van Geet, Dick Daniel"]
[Result "1/2-1/2"]
[ECO "B02"]
[PlyCount "17"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 Nc6 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 e6 5. Nxd5 exd5 6. Bb5 Be7 7. d4 0-0 8. 0-0 d6 9. Bf4 1/2-1/2

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.15"]
[Round "3"]
[White "Malich, Burkhard"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "E14"]
[PlyCount "49"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2 d5 5. e3 0-0 6. Bd3 b6 7. 0-0 Bb7 8. cxd5 exd5 9. Ne5 Bd6 10. b3 c5 11. Bb2 Qe7 12. Re1 Nc6 13. Nxc6 Bxc6 14. Rc1 Rac8 15. Qe2 Rfe8 16. Nf3 Bb7 17. Ba6 Bxa6 18. Qxa6 Ne4 19. dxc5 bxc5 20. Qd3 Qe6 21. Red1 Red8 22. Qc2 Be7 23. Nd2 Nxd2 24. Qxd2 Bf6 25. Bxf6 1/2-1/2

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.14"]
[Round "2"]
[White "Zuidema, Coen"]
[Black "Hecht, Hans Joachim"]
[Result "1/2-1/2"]
[ECO "B03"]
[PlyCount "80"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Be3 Bf5 8. Nc3 e6 9. Nf3 Bb4 10. Be2 0-0 11. 0-0 Bxc3 12. bxc3 Na5 13. Nd2 Qd7 14. Rf4 Bg6 15. Qf1 c5 16. Nb3 Qa4 17. dxc5 Nd7 18. c6 Nxb3 19. axb3 Qxc6 20. Bd4 Qc7 21. Rh4 Nxe5 22. Qf4 f6 23. Bxe5 fxe5 24. Qe3 b6 25. Re1 e4 26. Bh5 Qd8 27. Rh3 Bxh5 28. Rxh5 Qd3 29. Rh3 Rad8 30. Qxd3 exd3 31. Rd1 d2 32. Re3 Rd6 33. Re2 Rfd8 34. Kf2 Kf7 35. Re3 Rd3 36. Ke2 Rxe3+ 37. Kxe3 a5 38. Rxd2 Rxd2 39. Kxd2 e5 40. Ke3 Kf6 1/2-1/2

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1971.07.13"]
[Round "1"]
[White "Zuidema, Coen"]
[Black "Medina Garcia, Antonio Angel"]
[Result "1/2-1/2"]
[ECO "C87"]
[PlyCount "80"]
[EventDate "1971.07.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[EventCategory "7"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. 0-0 Bd7 6. d4 Nf6 7. c3 Be7 8. Re1 0-0 9. Nbd2 Re8 10. Nf1 h6 11. Ng3 Bf8 12. h3 g6 13. Bd2 Bg7 14. d5 Ne7 15. Bc2 Kh8 16. Nh2 c6 17. dxc6 bxc6 18. c4 Be6 19. Qc1 Nfg8 20. Ba4 Rf8 21. c5 d5 22. Ng4 Kh7 23. exd5 Bxg4 24. d6 Be6 25. dxe7 Nxe7 26. Ne4 Qc7 27. Nd6 Nf5 28. Nxf5 Bxf5 29. Bc3 Rad8 30. Re3 Rd3 31. Rxd3 Bxd3 32. Qe3 e4 33. Bxg7 Kxg7 34. Qd4+ f6 35. Qd6 Qxd6 36. cxd6 Rd8 37. Rc1 Rxd6 38. Rxc6 Rxc6 39. Bxc6 a5 40. f4 e3 1/2-1/2

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.30"]
[Round "15"]
[White "Jansa, Vlastimil"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C17"]
[PlyCount "74"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Qg4 Ne7 6. dxc5 Nbc6 7. Bd2 Bxc5 8. Nf3 Ng6 9. Bd3 0-0 10. Qh5 Bd7 11. 0-0 Be8 12. Rae1 h6 13. Qg4 Qd7 14. h4 f5 15. exf6 Rxf6 16. Bxh6 gxh6 17. h5 Qg7 18. hxg6 Bxg6 19. Qh3 Bf7 20. Kh1 Re8 21. Nh2 h5 22. g4 e5 23. gxh5 Be6 24. Qg3 Bxf2 25. Qxf2 Rxf2 26. Rxf2 Kh8 27. Rg1 Qe7 28. Rg6 e4 29. Rfg2 Qf8 30. Be2 d4 31. Bg4 Bxg4 32. Nxg4 dxc3 33. bxc3 e3 34. Rh6+ Qxh6 35. Nxh6 e2 36. Nf7+ Kh7 37. Ng5+ Kh6 0-1

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.28"]
[Round "14"]
[White "Zuidema, Coen"]
[Black "Adorjan, Andras"]
[Result "1/2-1/2"]
[ECO "B06"]
[PlyCount "18"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 a6 5. Nf3 b5 6. Bd3 Bb7 7. Qe2 Nd7 8. e5 e6 9. Bd2 Ne7 1/2-1/2

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.27"]
[Round "13"]
[White "Ciocaltea, Victor"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "C19"]
[PlyCount "53"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Nf3 Nbc6 8. a4 Qa5 9. Bd2 c4 10. Be2 Bd7 11. 0-0 f6 12. Re1 0-0-0 13. Bf1 Nf5 14. g3 h5 15. Bh3 Nce7 16. Qc1 Rdf8 17. Qa3 Rf7 18. Rab1 b6 19. Rb4 Re8 20. Qb2 Qa6 21. a5 Nc6 22. axb6 Nxb4 23. bxa7 Qxa7 24. Qxb4 Qa4 25. Qc5+ Qc6 26. Qa3 Qa4 27. Qc5+ 1/2-1/2

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.26"]
[Round "12"]
[White "Zuidema, Coen"]
[Black "Hecht, Hans Joachim"]
[Result "1-0"]
[ECO "C92"]
[PlyCount "113"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[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 Nd7 10. d4 Nb6 11. Nbd2 exd4 12. cxd4 Nb4 13. Qe2 c5 14. a3 Nc6 15. dxc5 dxc5 16. Nf1 c4 17. Bc2 Be6 18. Ng3 Re8 19. e5 g6 20. Bh6 Nd4 21. Nxd4 Qxd4 22. Be3 Qd8 23. f4 f5 24. exf6 Bxf6 25. Rad1 Qc7 26. Qf2 Nd5 27. Bd4 Qg7 28. Be4 Red8 29. f5 gxf5 30. Nxf5 Bxf5 31. Bxd5+ Rxd5 32. Bxf6 Qd7 33. Rxd5 Qxd5 34. Qg3+ Bg6 35. Re7 Rd8 36. Rg7+ Kf8 37. Rxh7 Qc5+ 38. Kh2 Bxh7 39. Qg7+ Ke8 40. Qh8+ Kf7 41. Qxd8 Be4 42. Bd4 Qc6 43. g4 Bh1 44. Kg3 Bg2 45. Qh8 Qf3+ 46. Kh2 Bf1 47. Qg7+ Ke8 48. Qe5+ Kd7 49. Qg3 Qe4 50. Qf2 Bd3 51. Qe3 Qd5 52. Bc3 Kc6 53. Kg3 Be4 54. Qd4 Qxd4 55. Bxd4 a5 56. Bc3 a4 57. Kf4 1-0

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.25"]
[Round "11"]
[White "Forintos, Gyozo Victor"]
[Black "Zuidema, Coen"]
[Result "1-0"]
[ECO "A07"]
[PlyCount "83"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. 0-0 Bg4 5. h3 Bh5 6. b3 Nbd7 7. Bb2 e6 8. d3 Bc5 9. Nbd2 0-0 10. e4 dxe4 11. dxe4 e5 12. a3 a5 13. Qe1 Re8 14. Nc4 Qc7 15. Bc3 Bxf3 16. Bxf3 Bd4 17. Rd1 b5 18. Ne3 Nc5 19. Nf5 Ncxe4 20. Bxe4 Bxc3 21. Qxc3 Nxe4 22. Qe3 g6 23. Qxe4 gxf5 24. Qxf5 Re6 25. Rfe1 Qe7 26. Re4 Rd8 27. Rde1 Re8 28. a4 Qd6 29. R1e3 bxa4 30. Rxa4 Rf6 31. Qg4+ Rg6 32. Qe2 Qd5 33. Qe1 f5 34. Rxa5 c5 35. Rd3 Qe6 36. Rxc5 f4 37. Kh2 e4 38. Rdd5 e3 39. g4 Qe4 40. Qe2 exf2 41. Qxf2 f3 42. Rf5 1-0

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.23"]
[Round "10"]
[White "Zuidema, Coen"]
[Black "Timman, Jan H"]
[Result "1-0"]
[ECO "B08"]
[PlyCount "91"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nf3 Nf6 5. Be2 0-0 6. 0-0 b6 7. e5 Nfd7 8. Bf4 Nc6 9. Re1 Bb7 10. Bf1 Nxd4 11. Nxd4 dxe5 12. Bg5 exd4 13. Bxe7 dxc3 14. Bxd8 cxb2 15. Rb1 Raxd8 16. Re3 Nc5 17. Qe1 Bd4 18. Re7 Bf6 19. Re3 Rd6 20. c3 Rfd8 21. Re8+ Rxe8 22. Qxe8+ Kg7 23. Rxb2 Re6 24. Qb8 Re1 25. Re2 Rd1 26. c4 Bc6 27. g4 Bd4 28. Qxc7 Be4 29. Qf4 f5 30. gxf5 gxf5 31. Rd2 Rxd2 32. Qxd2 Bf6 33. Bg2 Bd3 34. Bd5 Kg6 35. Qf4 Bb1 36. Qc7 Bd4 37. Qxa7 Nd3 38. Qf7+ Kg5 39. Qg8+ Kh6 40. Qe6+ Kg5 41. Qe7+ Kf4 42. Qh4+ Ke5 43. Qxh7 Bxf2+ 44. Kg2 Kd4 45. Qg7+ Ke3 46. Qh6+ 1-0

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.22"]
[Round "9"]
[White "Van Scheltinga, Theo D"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "D47"]
[PlyCount "39"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 b4 9. Ne4 Nxe4 10. Bxe4 Bb7 11. 0-0 Be7 12. b3 0-0 13. Bb2 Nf6 14. Bd3 c5 15. Qe2 Rc8 16. Rfd1 cxd4 17. Bxd4 Nd5 18. Bc4 Qa5 19. Bxd5 Bxd5 20. Nd2 1/2-1/2

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.21"]
[Round "8"]
[White "Zuidema, Coen"]
[Black "Krabbe, Tim"]
[Result "1/2-1/2"]
[ECO "C16"]
[PlyCount "99"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 b6 5. Qg4 Bf8 6. Nh3 Qd7 7. Nf4 Nc6 8. Be3 Bb7 9. Bb5 a6 10. Bxc6 Bxc6 11. h4 Nh6 12. Qf3 Ba4 13. Nfxd5 exd5 14. Bxh6 gxh6 15. Nxd5 0-0-0 16. Nf6 Bc6 17. Nxd7 Bxf3 18. gxf3 Rxd7 19. c3 Be7 20. Ke2 Rhd8 21. Ke3 c5 22. Rac1 Kb7 23. Rhd1 Bxh4 24. f4 f5 25. Rh1 Be7 26. Rxh6 cxd4+ 27. cxd4 Rxd4 28. Rxh7 R8d7 29. Kf3 Rd3+ 30. Kg2 Bc5 31. Rch1 Rxh7 32. Rxh7+ Kc6 33. Rh6+ Kc7 34. b4 Bxb4 35. Rf6 Ra3 36. Rxf5 Rxa2 37. Rf7+ Kd8 38. f5 Bc5 39. Kf3 Rxf2+ 40. Ke4 Rd2 41. f6 a5 42. Ra7 Rd7 43. Ra8+ Kc7 44. e6 Rd1 45. e7 Bxe7 46. fxe7 Re1+ 47. Kd5 Rxe7 48. Ra7+ Kd8 49. Ra8+ Kd7 50. Ra6 1/2-1/2

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.19"]
[Round "7"]
[White "Witkowski, Stefan"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "C53"]
[PlyCount "80"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 6. d5 Nd8 7. Bg5 f6 8. Be3 Nf7 9. Qe2 d6 10. Nbd2 f5 11. Bb5+ Bd7 12. Bxd7+ Qxd7 13. exf5 Ne7 14. c4 Qxf5 15. 0-0 0-0 16. Bxb6 axb6 17. a4 Ng6 18. Qe4 Qh5 19. Ra3 Nh6 20. g3 Rf5 21. Kg2 Raf8 22. h3 Rf4 23. Qe2 Nf5 24. Ng1 Qh6 25. Kh2 Nd4 26. Qe3 Nc2 27. Qe2 Nxa3 28. gxf4 Qxf4+ 29. Kh1 Nc2 30. Ne4 Ne3 31. fxe3 Qxf1 32. Qg4 Qf5 33. Kg2 Nf4+ 34. Kf3 Nd3+ 35. Qxf5 Rxf5+ 36. Kg4 Rf1 37. Nf3 Nxb2 38. Nfg5 Nxc4 39. Ne6 Nxe3+ 40. Kg3 Nxd5 0-1

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.18"]
[Round "6"]
[White "Zuidema, Coen"]
[Black "Danov, Kiril"]
[Result "0-1"]
[ECO "C77"]
[PlyCount "81"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Be7 7. d4 Nxe4 8. dxe5 0-0 9. Bd5 Nc5 10. Nd4 Bb7 11. Bxc6 dxc6 12. Be3 Ne6 13. Nxe6 fxe6 14. Qg4 Rf5 15. f4 c5 16. Nc3 Qe8 17. Rf2 h5 18. Qh3 Rd8 19. Ne2 h4 20. Qg4 Kf7 21. Kh1 Qc6 22. Ng1 Qe4 23. Qf3 Qxf3 24. Nxf3 g6 25. h3 Kg7 26. Re1 Rff8 27. Kh2 Rd7 28. Ref1 Be4 29. g4 hxg3+ 30. Kxg3 Bf5 31. h4 Rfd8 32. c3 Rd3 33. Re2 Rh8 34. Rfe1 Be4 35. Ng5 Bf5 36. Nf3 c4 37. Rh2 c5 38. Kf2 Bg4 39. Nd2 Bxh4+ 40. Rxh4 Rxh4 41. Ne4 0-1

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.17"]
[Round "5"]
[White "Hartoch, Robert G"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]
[ECO "A12"]
[PlyCount "113"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 c6 3. b3 d5 4. Bb2 Bg4 5. Ne5 Bh5 6. d4 Nbd7 7. Nd3 Bg6 8. e3 e6 9. Nd2 Bd6 10. Be2 0-0 11. 0-0 Bxd3 12. Bxd3 e5 13. cxd5 cxd5 14. e4 dxe4 15. Nxe4 Nxe4 16. Bxe4 exd4 17. g3 Nf6 18. Qxd4 Qd7 19. Rfd1 Rfd8 20. Bg2 Qe7 21. Qh4 Bc5 22. Bxf6 Qxf6 23. Qxf6 gxf6 24. Bxb7 Rab8 25. Be4 Bd4 26. Rac1 Rd6 27. Kf1 Rbd8 28. Rc4 h6 29. Ke2 Kf8 30. Ra4 Bb6 31. Rxd6 Rxd6 32. Rc4 Rd4 33. Rc8+ Ke7 34. f3 Rd8 35. Rc4 Rd4 36. Rc2 Ke6 37. Bd3 Rd6 38. Rc4 Rd4 39. Rc6+ Ke7 40. Rc2 Rd5 41. f4 Rd8 42. Bc4 Kf8 43. Kf3 Ba5 44. Ke4 Ke7 45. Kf5 Rd2 46. Rxd2 Bxd2 47. g4 a5 48. Ke4 Bc1 49. h3 Bd2 50. f5 Kd6 51. Kd4 Bc1 52. Bxf7 Bb2+ 53. Kc4 Ba3 54. Kb5 Bb4 55. Kb6 Be1 56. Kb7 Bg3 57. Kc8 1/2-1/2

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.15"]
[Round "4"]
[White "Zuidema, Coen"]
[Black "Kostro, Jerzy"]
[Result "1/2-1/2"]
[ECO "C92"]
[PlyCount "136"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[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 Qd7 10. d3 Na5 11. Bc2 c5 12. Nbd2 Bb7 13. Nf1 Rfe8 14. Ng3 g6 15. Bg5 Kg7 16. Qd2 Ng8 17. Bxe7 Qxe7 18. b4 Nc6 19. d4 a5 20. d5 Nb8 21. Reb1 Rc8 22. bxa5 Rxa5 23. a4 bxa4 24. Rxa4 Rxa4 25. Bxa4 Ba6 26. Rb6 Qc7 27. Qb2 Nf6 28. Nd2 Rd8 29. Ngf1 Qa7 30. Ne3 Bd3 31. Bc2 Bxc2 32. Nxc2 Ne8 33. Rb7 Qa4 34. Rb3 Qa7 35. Rb7 Qa4 36. Rb3 Qa7 37. Nc4 Nd7 38. N2a3 Rb8 39. Rxb8 Nxb8 40. Qb6 Qxb6 41. Nxb6 f5 42. exf5 gxf5 43. f3 Kf6 44. Nc8 Nd7 45. Kf2 f4 46. Ke2 Kf5 47. Nb5 e4 48. Ncxd6+ Nxd6 49. Nxd6+ Ke5 50. Nxe4 Kxd5 51. g3 fxg3 52. Nxg3 Nf6 53. Kd3 c4+ 54. Ke3 Ke5 55. f4+ Kd5 56. Kf3 Ke6 57. Ne2 Kd5 58. Ng3 Ke6 59. Ne4 Nd5 60. Ng5+ Kf5 61. Ne4 Kg6 62. h4 h5 63. Kg3 Kg7 64. f5 Kf7 65. Kf2 Ke7 66. Kf3 Kf7 67. Nd6+ Kf6 68. Nxc4 Nxc3 1/2-1/2

[Event "Hoogovens-B"]
[Site "Wijk aan Zee"]
[Date "1971.01.14"]
[Round "3"]
[White "Denker, Arnold Sheldon"]
[Black "Zuidema, Coen"]
[Result "0-1"]
[ECO "E21"]
[PlyCount "84"]
[EventDate "1971.01.12"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "NED"]
[SourceTitle "MCL"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Nf3 Bb7 6. Bd2 0-0 7. Qc2 d6 8. a3 Bxc3 9. Bxc3 Ne4 10. Bd3 f5 11. b4 a5 12. b5 Nd7 13. Bb2 Ng5 14. Nd2 Bxg2 15. Rg1 Be4 16. f4 Bxd3 17. Qxd3 Nf7 18. 0-0-0 Nh6 19. d5 e5 20. Nf3 Ng4 21. fxe5 Ndxe5 22. Nxe5 Nxe5 23. Bxe5 dxe5 24. d6 cxd6 25. Qxd6 Qxd6 26. Rxd6 Rac8 27. Rxb6 Rxc4+ 28. Kb2 Rc7 29. Ra6 f4 30. exf4 exf4 31. Rxa5 f3 32. a4 f2 33. Rf1 Re7 34. b6 Re1 35. Rxf2 Rxf2+ 36. Kc3 Rb1 37. Ra8+ Rf8 38. Ra6 Rc8+ 39. Kd4 Rd1+ 40. Ke3 Re8+ 41. Kf2 Rd6 42. a5 Rf6+ 0-1

