[Event "NED-ch22"]
[Site "The Hague"]
[Date "1965.09.10"]
[Round "3"]
[White "Kuijpers, Frans"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "B80"]
[PlyCount "49"]
[EventDate "1965.09.08"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 Nf6 4. Bg2 e6 5. Nge2 Be7 6. 0-0 0-0 7. d4 cxd4 8. Nxd4 d6 9. b3 Bd7 10. Nde2 a6 11. Bb2 Qc7 12. h3 b5 13. Qd2 b4 14. Nd1 d5 15. exd5 Nxd5 16. c4 Nf6 17. Ne3 Rfd8 18. Qc2 Bc8 19. Rad1 Bb7 20. Nd5 Nxd5 21. cxd5 exd5 22. Bxd5 Bd6 23. Qf5 Rd7 24. Be4 f6 25. Qxh7+ 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "2"]
[White "Bergsma, Klaas"]
[Black "Gibbs, Peter Campbell"]
[Result "1-0"]
[ECO "B77"]
[PlyCount "43"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 0-0 8. Bb3 Qa5 9. f3 d6 10. Qd2 Nxd4 11. Bxd4 Be6 12. 0-0-0 Rfc8 13. Kb1 Rc6 14. g4 Rac8 15. h4 b5 16. a3 Ra6 17. Na2 Bxb3 18. cxb3 Qxd2 19. Rxd2 Rac6 20. Bxa7 Nd7 21. Nb4 R6c7 22. Nd5 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "9"]
[White "Bergsma, Klaas"]
[Black "Henneberke, Frans"]
[Result "1/2-1/2"]
[ECO "C76"]
[PlyCount "87"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 6. 0-0 g6 7. d4 Bg7 8. d5 Nb8 9. Bxd7+ Nxd7 10. c4 Ngf6 11. Nc3 0-0 12. Bg5 h6 13. Bh4 Qc8 14. Ne1 Nc5 15. Bxf6 Bxf6 16. b4 Nd7 17. Nd3 Be7 18. Qb3 Kh7 19. a4 a5 20. Rfb1 b6 21. bxa5 Rxa5 22. Nb4 Nc5 23. Qc2 Bg5 24. Nc6 Ra8 25. a5 bxa5 26. Rxa5 Rxa5 27. Nxa5 f5 28. Nc6 fxe4 29. Nxe4 Qf5 30. Re1 Ra8 31. f3 Nxe4 32. fxe4 Be3+ 33. Kh1 Qf2 34. Qxf2 Bxf2 35. Rf1 Ra2 36. Nd8 Rc2 37. Ne6 Rxc4 38. g4 Rc2 39. Nxc7 Rxc7 40. Rxf2 Rc4 41. Rf7+ Kg8 42. Rf6 Kg7 43. Rxd6 Rxe4 44. h3 1/2-1/2

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "11"]
[White "Bergsma, Klaas"]
[Black "Litmanowicz, Wladyslaw"]
[Result "1-0"]
[ECO "C88"]
[PlyCount "69"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 0-0 8. a4 Bb7 9. d3 d6 10. Bd2 Qd7 11. Nc3 Nd8 12. axb5 axb5 13. Rxa8 Bxa8 14. Qa1 Ne6 15. Qa5 Bc6 16. Bd5 Rb8 17. Qa6 Bxd5 18. exd5 Nc5 19. Qa2 Qc8 20. d4 Ncd7 21. dxe5 Nxe5 22. Nxe5 dxe5 23. Rxe5 Bd6 24. Re1 Qf5 25. Qa7 Rf8 26. Qd4 Qxc2 27. Bg5 Nd7 28. Nxb5 Be5 29. Qb4 Bxb2 30. Nxc7 Ne5 31. Qe7 Bd4 32. Bh4 Qc3 33. Rb1 Qc2 34. Qxf8+ Kxf8 35. Rb8# 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "7"]
[White "Bergsma, Klaas"]
[Black "Mueller, Hans"]
[Result "1-0"]
[ECO "B08"]
[PlyCount "55"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. Nc3 c6 5. Be2 Nf6 6. 0-0 0-0 7. a4 Qc7 8. Bf4 Nh5 9. Be3 e5 10. Qd2 Nd7 11. Rad1 Re8 12. Ng5 Nhf6 13. Bc4 Re7 14. f4 exd4 15. Bxd4 h6 16. Nxf7 Rxf7 17. Bxf7+ Kxf7 18. e5 Ne8 19. e6+ Kxe6 20. f5+ gxf5 21. Bxg7 Nxg7 22. Qxh6+ Nf6 23. Ne4 Nge8 24. Nxf6 Nxf6 25. Qg6 Qb6+ 26. Kh1 Qxb2 27. Rxf5 d5 28. Rxf6+ 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "4"]
[White "Bergsma, Klaas"]
[Black "Van Geet, Dick Daniel"]
[Result "0-1"]
[ECO "B08"]
[PlyCount "54"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. Nc3 Nf6 5. Be2 0-0 6. 0-0 c6 7. a4 d5 8. e5 Nfd7 9. Bf4 Re8 10. Qd2 Nf8 11. h3 Ne6 12. Bg3 a5 13. Rad1 Qb6 14. Nh4 f5 15. exf6 exf6 16. Bd6 Na6 17. f4 Bh6 18. Nf3 Qd8 19. Bxa6 Qxd6 20. Bd3 Bxf4 21. Qe1 Ng7 22. Ne2 Bf5 23. g3 Bh6 24. Kh2 Re3 25. Qf2 Rae8 26. Neg1 Bxd3 27. Rxd3 Nf5 0-1

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "5"]
[White "Flesch, Janos"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "A07"]
[PlyCount "89"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. 0-0 e5 5. d3 Ne7 6. e4 0-0 7. Nc3 dxe4 8. Nxe4 f5 9. Ned2 Nbc6 10. Re1 Be6 11. Qe2 Qd6 12. c3 Bd5 13. b4 a6 14. Bb2 Rad8 15. Bf1 Rfe8 16. a3 h6 17. Rad1 Nc8 18. Ne4 fxe4 19. dxe4 Qe6 20. exd5 Rxd5 21. Rxd5 Qxd5 22. c4 Qe6 23. c5 Kh7 24. Qe4 Qf5 25. Qxf5 gxf5 26. Bh3 N8e7 27. Nh4 Rf8 28. Rd1 f4 29. Rd7 Rd8 30. Rxc7 Rd1+ 31. Kg2 Rb1 32. Bf5+ Nxf5 33. Nxf5 Kg6 34. Nxg7 Rxb2 35. Ne8 Nd4 36. Rg7+ Kf5 37. Nd6+ Ke6 38. gxf4 exf4 39. Rg6+ Kd5 40. Nxb7 Rb3 41. c6 Rc3 42. Rd6+ Ke5 43. Rxd4 Kxd4 44. Nc5 f3+ 45. Kg3 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "3"]
[White "Kieninger, Georg"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "B70"]
[PlyCount "85"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. g3 g6 7. Bg2 Nxd4 8. Qxd4 Bg7 9. 0-0 0-0 10. Qd2 Bd7 11. Re1 Rc8 12. e5 dxe5 13. Bxb7 Rb8 14. Bg2 Ne8 15. b3 Nd6 16. Bb2 Nc4 17. bxc4 Rxb2 18. Red1 Qa5 19. Qxd7 Qxc3 20. Qxa7 Qxc2 21. a4 Bh6 22. Re1 Rd8 23. Rxe5 Bg7 24. Rd5 Rxd5 25. cxd5 Be5 26. Qe3 Bd6 27. Rc1 Rb1 28. Rxb1 Qxb1+ 29. Bf1 Qd1 30. Qe4 Bc5 31. Kg2 Qd4 32. Qxd4 Bxd4 33. a5 Kg7 34. a6 g5 35. f4 gxf4 36. gxf4 Kf6 37. Kf3 Ba7 38. Ke4 h6 39. Bh3 Bg1 40. Kd3 e5 41. d6 exf4 42. Ke4 Be3 43. Kd5 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "1"]
[White "Kramer, Haije J"]
[Black "Bergsma, Klaas"]
[Result "1/2-1/2"]
[ECO "A25"]
[PlyCount "100"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nc6 3. g3 Bc5 4. Bg2 d6 5. e3 Nge7 6. Nge2 0-0 7. 0-0 a6 8. a3 Bf5 9. d4 Ba7 10. d5 Na5 11. b3 Qd7 12. Bd2 Bh3 13. Ne4 Bxg2 14. Kxg2 Bb6 15. Qc2 c6 16. Ng5 f5 17. b4 Nxc4 18. Qxc4 cxd5 19. Qb3 h6 20. Nh3 g5 21. f4 gxf4 22. exf4 Kh7 23. Rac1 d4 24. fxe5 dxe5 25. Qf3 Rf6 26. Rfd1 Nc6 27. a4 Re8 28. Kh1 e4 29. Qh5 e3 30. Bxe3 Qd5+ 31. Kg1 Rxe3 32. Nef4 Qg8 33. b5 axb5 34. axb5 Ne5 35. Nf2 d3 36. Kf1 Qb3 37. Qe8 Rf3 38. Rd2 Bxf2 39. Rc7+ Nf7 40. Rxf2 Rxf2+ 41. Kxf2 d2 42. Rc8 Rg6 43. Rd8 d1Q 44. Rxd1 Qxd1 45. Qxf7+ Rg7 46. Qxf5+ Kg8 47. Qc8+ Kh7 48. Qf5+ Kg8 49. Qe6+ Kh7 50. Qe4+ Kg8 1/2-1/2

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "6"]
[White "Lehmann, Heinz"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "D45"]
[PlyCount "79"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c6 3. Nc3 d5 4. e3 e6 5. Nf3 Nbd7 6. Qc2 Bd6 7. Bd2 0-0 8. 0-0-0 c5 9. cxd5 exd5 10. Be1 c4 11. h3 Re8 12. g4 Bb4 13. Bg2 Bxc3 14. Bxc3 Ne4 15. Be1 Nb6 16. Nd2 Bd7 17. Nxe4 dxe4 18. Ba5 Qe7 19. Rde1 Nd5 20. f3 exf3 21. Bxf3 Be6 22. Kb1 Rac8 23. e4 Nb4 24. Bxb4 Qxb4 25. Qc3 Qa4 26. Rhf1 b5 27. Bd1 Qa6 28. d5 Bd7 29. e5 Qb7 30. Qf3 Rf8 31. Bc2 b4 32. Qd1 a5 33. e6 fxe6 34. dxe6 Bc6 35. e7 Rfe8 36. Qd6 b3 37. Bf5 bxa2+ 38. Ka1 g6 39. Bxc8 Qxc8 40. Rf8+ 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "8"]
[White "Sandor, Bela"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "E05"]
[PlyCount "65"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. c4 e6 2. Nf3 Nf6 3. g3 Be7 4. Bg2 0-0 5. 0-0 d5 6. d4 dxc4 7. Na3 Bxa3 8. bxa3 Nbd7 9. a4 a5 10. Ba3 Re8 11. Rc1 Nb6 12. Ne5 Nfd7 13. Nxc4 Nxc4 14. Rxc4 Nb6 15. Rc5 Qd7 16. Qc2 Qxd4 17. Bb2 Qxa4 18. Qc3 f6 19. Rxc7 e5 20. f4 Qb4 21. fxe5 Qxc3 22. Bxc3 f5 23. e6 Bxe6 24. Rxg7+ Kf8 25. Rxh7 Na4 26. Ba1 Rac8 27. Bxb7 Rc2 28. e4 Rxa2 29. Bd5 Rxa1 30. Rxa1 Bxd5 31. exd5 Re4 32. d6 Rd4 33. Rb1 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1964.??.??"]
[Round "10"]
[White "Smederevac, Petar"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "C00"]
[PlyCount "145"]
[EventDate "1964.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e6 2. Qe2 e5 3. d3 Bc5 4. Be3 Bb6 5. Bxb6 axb6 6. Qg4 g6 7. Nc3 d6 8. Qd1 Nc6 9. Nf3 Nf6 10. Qd2 0-0 11. Be2 Kg7 12. 0-0 Nh5 13. d4 Nf4 14. dxe5 dxe5 15. Nd5 Bg4 16. c3 Bxf3 17. Bxf3 Ne7 18. Rfd1 Nexd5 19. exd5 Qf6 20. Qe3 Rfd8 21. g3 Nh3+ 22. Kf1 Ng5 23. Bg2 h5 24. h4 Nh7 25. Re1 Re8 26. c4 Qd6 27. Qc3 Nf6 28. a3 Kh7 29. Re2 Nd7 30. Rae1 f5 31. Kg1 Re7 32. b4 Rae8 33. f3 Nf6 34. Rd2 Rd7 35. Red1 e4 36. f4 Ng4 37. c5 Qf6 38. Qb3 e3 39. Re2 Nf2 40. Rde1 Qd4 41. d6 bxc5 42. Bxb7 c4 43. Qa4 Red8 44. dxc7 Rxc7 45. Bf3 Nd3 46. Rb1 c3 47. Qc2 Ra7 48. Rb3 Rc7 49. b5 Rb8 50. Bc6 Nf2 51. Qxc3 Qxc3 52. Rxc3 Rxb5 53. Rexe3 Rb2 54. Bf3 Rxc3 55. Rxc3 Nh3+ 56. Kf1 Ra2 57. Bd5 Rd2 58. Bb3 Nf2 59. Rc2 Ne4 60. Rc7+ Kh6 61. Bg8 Nf6 62. Bc4 Ne4 63. Rc6 Kg7 64. Ke1 Rg2 65. Rc7+ Kh6 66. Bg8 Nf6 67. Bf7 Rxg3 68. a4 Ra3 69. Ra7 Ne4 70. a5 Nd6 71. Bg8 g5 72. fxg5+ Kg6 73. Bh7# 1-0

[Event "Match/Nation ENG-NED"]
[Site "Birmingham"]
[Date "1963.11.24"]
[Round "2.6"]
[White "Bergsma, Klaas"]
[Black "Barden, Leonard William"]
[Result "1/2-1/2"]
[ECO "B57"]
[PlyCount "73"]
[EventDate "1963.11.23"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "ENG"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 Bd7 7. Bb3 g6 8. f3 Nxd4 9. Qxd4 Bg7 10. Be3 b5 11. g4 0-0 12. Qd2 b4 13. Ne2 a5 14. a4 bxa3 15. Rxa3 a4 16. Ba2 Qb8 17. Bd4 e5 18. Bc3 Be6 19. 0-0 Rd8 20. g5 Nh5 21. Ra1 Qb6+ 22. Kg2 Bd7 23. Bd5 Ra7 24. Bc4 Bf8 25. R3a2 Bc6 26. b3 Rda8 27. bxa4 Rxa4 28. Rxa4 Rxa4 29. Rxa4 Bxa4 30. Qd5 Be8 31. Ba5 Qe3 32. Bd2 Qb6 33. f4 exf4 34. Nxf4 Nxf4+ 35. Bxf4 Qc7 36. Qd3 Bc6 37. Bd5 1/2-1/2

[Event "Match/Nation ENG-NED"]
[Site "Birmingham"]
[Date "1963.11.23"]
[Round "1.6"]
[White "Barden, Leonard William"]
[Black "Bergsma, Klaas"]
[Result "1/2-1/2"]
[ECO "E27"]
[PlyCount "89"]
[EventDate "1963.11.23"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "ENG"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 0-0 6. f3 Ne8 7. e4 b6 8. Bd3 Ba6 9. Nh3 Nc6 10. Qe2 Na5 11. e5 f5 12. Bg5 Qc8 13. Be7 Rf7 14. Bb4 Qd8 15. 0-0 Nc6 16. Qe3 h6 17. Rfe1 Bb7 18. d5 a5 19. dxc6 Bxc6 20. Nf4 axb4 21. cxb4 Qg5 22. Kh1 h5 23. Nh3 Qxe3 24. Rxe3 g6 25. Ng5 Re7 26. Bc2 Ba4 27. Bd3 c6 28. h4 Nc7 29. Nh3 Kg7 30. Nf4 Rd8 31. Rae1 d6 32. exd6 Rxd6 33. g3 Kf6 34. c5 bxc5 35. bxc5 Rd4 36. Ne2 Rd8 37. Nc3 Bb3 38. f4 Nd5 39. Nxd5+ Bxd5+ 40. Kg1 Ra7 41. Bc2 Ra5 42. Rc3 Rb8 43. a4 Rb4 44. Kf2 Rc4 45. Rxc4 1/2-1/2

[Event "NED-ch21"]
[Site "The Hague"]
[Date "1963.06.01"]
[Round "8"]
[White "Langeweg, Kick"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "E13"]
[PlyCount "75"]
[EventDate "1963.05.22"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 h6 6. Bh4 Bxc3+ 7. bxc3 Bb7 8. e3 d6 9. Bd3 Nbd7 10. 0-0 Qe7 11. Nd2 g5 12. Bg3 0-0-0 13. a4 h5 14. f3 a5 15. Qe2 Rdg8 16. c5 dxc5 17. Ba6 h4 18. Be5 Nxe5 19. dxe5 Nd7 20. Bxb7+ Kxb7 21. Nc4 Ra8 22. Rab1 Nb8 23. f4 g4 24. Qxg4 Nc6 25. Qf3 Rhd8 26. Rb5 Rd5 27. Rfb1 Ra6 28. h3 Ka7 29. R5b2 Qd7 30. Na3 Ne7 31. Nb5+ Kb8 32. Qe2 Ra8 33. e4 Rd3 34. Nd6 c4 35. Rxb6+ cxb6 36. Rxb6+ Ka7 37. Qf2 Qd8 38. Nb5# 1-0

[Event "NED-ch21"]
[Site "The Hague"]
[Date "1963.05.28"]
[Round "6"]
[White "Van Oosterom, Henny"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "A29"]
[PlyCount "76"]
[EventDate "1963.05.22"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e5 3. g3 Nc6 4. Bg2 Bc5 5. d3 d6 6. Nf3 0-0 7. 0-0 h6 8. e3 a6 9. a3 Bf5 10. d4 Ba7 11. b4 Re8 12. d5 Ne7 13. Nh4 Bg4 14. Qc2 Qd7 15. Bd2 Bh3 16. e4 Bxg2 17. Kxg2 c6 18. Qd3 cxd5 19. cxd5 Rac8 20. f4 exf4 21. Bxf4 Rxc3 22. Qxc3 Nexd5 23. Qd2 Rxe4 24. Rae1 Rd4 25. Qc2 Nxf4+ 26. gxf4 Qg4+ 27. Kh1 Qxh4 28. Qc8+ Kh7 29. Qc2+ g6 30. Re7 Kg7 31. Qc7 Rd2 32. Rxf7+ Kg8 33. Rg7+ Kh8 34. Rh7+ Nxh7 35. Qc8+ Kg7 36. Qc7+ Kg8 37. Qc4+ d5 38. Qc8+ Nf8 0-1

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Bergsma, Klaas"]
[Black "Diemer, Emil Joseph"]
[Result "0-1"]
[ECO "B31"]
[PlyCount "124"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. c3 Nf6 5. Qe2 Qc7 6. 0-0 Ng4 7. h3 h5 8. d3 a6 9. Bxc6 dxc6 10. Bg5 Bh6 11. Bxh6 Rxh6 12. Qd2 Rh8 13. Qg5 f6 14. Qxg6+ Kf8 15. hxg4 hxg4 16. Nbd2 gxf3 17. Nxf3 Qf4 18. Qg3 Qh6 19. Qh2 Qg7 20. Nh4 Kf7 21. f4 Bg4 22. Kf2 Qh6 23. Rh1 e5 24. g3 Rad8 25. Ke3 f5 26. Nf3 exf4+ 27. gxf4 Rxd3+ 28. Kxd3 Qd6+ 29. Ke3 Rxh2 30. Ne5+ Qxe5 31. fxe5 Re2+ 32. Kf4 Rxe4+ 33. Kg5 Ke6 34. Rh7 Be2 35. Re1 Rg4+ 36. Kh6 Rh4+ 37. Kg7 Rxh7+ 38. Kxh7 Bd3 39. Rh1 f4+ 40. Kh6 f3 41. Rh2 Be2 42. Rf2 Kxe5 43. Kg5 Ke4 44. Kg4 c4 45. Kg3 Kd3 46. Rh2 Kc2 47. Rh7 b5 48. Rh6 Kxb2 49. Rxc6 Kxc3 50. Rxa6 b4 51. Rb6 Bd1 52. Kf2 b3 53. axb3 cxb3 54. Rc6+ Kb2 55. Ke3 Be2 56. Rc7 Ka3 57. Ra7+ Kb4 58. Rb7+ Bb5 59. Rh7 b2 60. Rh1 Kc3 61. Re1 Be2 62. Rh1 Kc2 0-1

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Bergsma, Klaas"]
[Black "Ditt, Egon H"]
[Result "1-0"]
[ECO "C35"]
[PlyCount "79"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Be2 Nf6 5. e5 Ng4 6. d4 d6 7. Bxf4 Nc6 8. h3 dxe5 9. dxe5 Qxd1+ 10. Bxd1 g5 11. Nxg5 Ngxe5 12. Nc3 Rg8 13. h4 Be6 14. Nxe6 fxe6 15. Bh5+ Kd7 16. 0-0-0+ Bd6 17. Rhe1 Kc8 18. g3 b6 19. Ne4 Be7 20. Ng5 Bd6 21. Nf3 Nxf3 22. Bxf3 Kd7 23. Bxc6+ Kxc6 24. Rxe6 Rad8 25. Rh6 Rd7 26. Rd3 a5 27. Kd2 Kc5 28. Bxd6+ cxd6 29. Ke2 b5 30. Kf2 b4 31. Rf3 Rc8 32. g4 Kd4 33. Rd3+ Ke5 34. Rh5+ Ke4 35. Rd2 Rf7+ 36. Kg2 Ke3 37. Rhd5 Rc4 38. R5d3+ Ke4 39. Re2+ Kf4 40. Rf3+ 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Bergsma, Klaas"]
[Black "Donk, Merlijn Silvester"]
[Result "1-0"]
[ECO "C83"]
[PlyCount "73"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7 10. Be3 0-0 11. Nbd2 Nxd2 12. Qxd2 Na5 13. Nd4 c5 14. Nxe6 fxe6 15. Bc2 Nc4 16. Qd3 Rf5 17. Bc1 Rh5 18. b3 Nb6 19. Qe2 Qe8 20. Bd2 c4 21. b4 Rd8 22. f4 Qf7 23. g4 Rh4 24. Be1 Rh6 25. f5 Na4 26. Qe3 Bh4 27. Bxh4 Rxh4 28. Qg5 Qa7+ 29. Kh1 Qa8 30. Qxh4 d4+ 31. Kg1 Nxc3 32. Qe1 Qa7 33. Qf2 Nd5 34. Rae1 Nxb4 35. Be4 c3 36. fxe6 Nxa2 37. Bxh7+ 1-0

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Bergsma, Klaas"]
[Black "Franx"]
[Result "0-1"]
[ECO "C02"]
[PlyCount "74"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3 c4 7. g3 Bd7 8. Bg2 Na5 9. Nbd2 h6 10. 0-0 0-0-0 11. Ne1 f5 12. exf6 gxf6 13. Nef3 Ne7 14. Re1 Ng6 15. Rb1 e5 16. Nf1 Bf5 17. Ra1 Nb3 18. Be3 e4 19. N3d2 Nxa1 20. Qxa1 Qe6 21. b3 Bh3 22. bxc4 Bxg2 23. Kxg2 Rg8 24. h3 f5 25. cxd5 Qd7 26. Kh2 Bd6 27. Nc4 f4 28. Nxd6+ Qxd6 29. Bc1 e3 30. Qa2 Nh4 31. gxh4 Qg6 32. Nxe3 fxe3 33. Qc4+ Kb8 34. Qf1 exf2 35. Bf4+ Ka8 36. Qxf2 Rdf8 37. Qg3 Qc2+ 0-1

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Bergsma, Klaas"]
[Black "Jovanovic, Velibor"]
[Result "1/2-1/2"]
[ECO "B17"]
[PlyCount "85"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[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 Nd7 5. Nf3 Ngf6 6. Ng3 Qc7 7. Bd3 e6 8. 0-0 Bd6 9. Qe2 0-0 10. Ne4 Bf4 11. Nxf6+ Nxf6 12. Ne5 Bxc1 13. Raxc1 c5 14. dxc5 Qxc5 15. Rcd1 Qc7 16. f4 b6 17. Rf3 Bb7 18. Rh3 g6 19. Rf1 Rad8 20. Qe1 Kg7 21. Qh4 h5 22. Qg5 Be4 23. Kh1 Rh8 24. Re3 Bxd3 25. cxd3 h4 26. Ng4 Nd5 27. Qe5+ Qxe5 28. Rxe5 Nb4 29. Nf2 Nxd3 30. Nxd3 Rxd3 31. Re2 Rhd8 32. Kg1 Rd1 33. Rxd1 Rxd1+ 34. Kf2 Kf6 35. Kf3 Rd3+ 36. Ke4 Rd5 37. Rc2 Rb5 38. Rd2 Ke7 39. Kf3 f5 40. Rc2 Kd6 41. Re2 Rd5 42. Rc2 a5 43. Ke3 1/2-1/2

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Crabbendam, Henrico"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "B45"]
[PlyCount "75"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Nxc6 bxc6 7. e5 Nd5 8. Ne4 Qc7 9. f4 Qb6 10. Qf3 Bb7 11. c3 Be7 12. Bd3 f5 13. exf6 gxf6 14. Qh5+ Kd8 15. Bd2 Rb8 16. b3 f5 17. Ng5 Kc7 18. Nf7 Rhg8 19. Qe2 Bf6 20. Rc1 Rg7 21. Ne5 Rbg8 22. g3 Bxe5 23. Qxe5+ d6 24. Qe2 c5 25. Rf1 e5 26. fxe5 Re7 27. Kd1 Rxe5 28. Qh5 Rge8 29. Rxf5 Ne3+ 30. Bxe3 Rxe3 31. Rf7+ Kb8 32. Kd2 Qa5 33. Qxh7 Qxa2+ 34. Rc2 Qxb3 35. Bc4 Qb6 36. Rc1 Be4 37. Rxa7 Bxh7 38. Rca1 0-1

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Durao, Joaquim Manuel"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "B24"]
[PlyCount "74"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 c5 3. Bg2 g6 4. 0-0 Bg7 5. d3 Nc6 6. Nc3 e6 7. e4 Nge7 8. Nd2 0-0 9. Ne2 b6 10. f4 Bb7 11. Nf3 dxe4 12. dxe4 Qc7 13. c3 Rad8 14. Qc2 Ba6 15. Ne1 Rd7 16. Be3 Rfd8 17. Rf2 Na5 18. b3 Nac6 19. Rc1 f5 20. e5 Nd5 21. Bxd5 Rxd5 22. c4 R5d7 23. a3 Bb7 24. h4 Bf8 25. Rh2 Nd4 26. Bxd4 cxd4 27. Nd3 Qc6 28. Ra1 Qf3 29. b4 Qe3+ 30. Kf1 Be4 31. Rd1 Rc7 32. Qb3 h5 33. Rf2 Kf7 34. Rh2 Be7 35. Rf2 Bf3 36. Ndc1 d3 37. Nxd3 Rcd7 0-1

[Event "Hoogovens-B"]
[Site "Beverwijk"]
[Date "1956.??.??"]
[Round "?"]
[White "Tilstra, Arjen"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "D93"]
[PlyCount "59"]
[EventDate "1956.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. Bf4 0-0 6. e3 c5 7. Rc1 cxd4 8. exd4 Nc6 9. Ne5 Nh5 10. Nxc6 bxc6 11. Be3 Rb8 12. cxd5 cxd5 13. b3 e5 14. dxe5 Bxe5 15. Nxd5 Re8 16. Bc4 Qh4 17. g3 Nxg3 18. fxg3 Bxg3+ 19. hxg3 Qxh1+ 20. Kd2 Qg2+ 21. Kc3 Qxg3 22. Qd4 Rb6 23. Kb2 Rxe3 24. Nxe3 Be6 25. Bxe6 fxe6 26. Rc8+ Kf7 27. Qd7+ Kf6 28. Qd8+ Ke5 29. Qc7+ Rd6 30. Nc4+ 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "9"]
[White "Bergsma, Klaas"]
[Black "Bouwmeester, Hans"]
[Result "0-1"]
[ECO "B17"]
[PlyCount "113"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Ng3 e6 7. Bd3 Be7 8. 0-0 0-0 9. Qe2 b6 10. Rd1 Bb7 11. c4 Qc7 12. Bd2 Rfe8 13. Bc3 c5 14. Rac1 cxd4 15. Bxd4 Qc6 16. Bb1 Bf8 17. b3 e5 18. Bb2 g6 19. Nf1 Nh5 20. Ne3 Nf4 21. Qf1 Bc5 22. Nd5 Nxd5 23. cxd5 Qf6 24. a3 a5 25. Qc4 Qe7 26. Be4 Bd6 27. a4 Ba6 28. Qc3 Nc5 29. Nd2 Qh4 30. Qg3 Qxg3 31. hxg3 Bb7 32. Bc2 Bf8 33. Nc4 Nd7 34. Ba3 Bxa3 35. Nxa3 Rec8 36. Nc4 Rc5 37. d6 Rac8 38. Re1 Kg7 39. Rcd1 f5 40. f3 Re8 41. Bd3 Bd5 42. Bf1 Kf6 43. Re3 Be6 44. Na3 Rec8 45. Bc4 Bxc4 46. Nxc4 b5 47. axb5 Rxb5 48. Ra1 Ra8 49. Kf2 Ke6 50. Rd1 Re8 51. Rd2 Reb8 52. Ke2 Rc5 53. Rc3 Rb4 54. Re3 a4 55. Na3 Rxb3 56. Rxb3 axb3 57. Rb2 0-1

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "3"]
[White "Bergsma, Klaas"]
[Black "Donner, Jan Hein"]
[Result "0-1"]
[ECO "C97"]
[PlyCount "54"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[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 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Re8 13. Nf1 Nc4 14. Bd3 cxd4 15. cxd4 exd4 16. Nxd4 Bb7 17. b3 Ne5 18. Bb2 d5 19. exd5 Nxd3 20. Qxd3 Nxd5 21. Rac1 Qf4 22. Nf5 Bf8 23. Rcd1 Nb4 24. Qd7 Bc6 25. Rxe8 Rxe8 26. Rd4 Bxd7 27. Rxf4 Nd3 0-1

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "5"]
[White "Bergsma, Klaas"]
[Black "Perez Perez, Francisco Jose"]
[Result "1/2-1/2"]
[ECO "D70"]
[PlyCount "52"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. e3 g6 4. c4 Bg7 5. cxd5 0-0 6. Be2 Nxd5 7. 0-0 c6 8. e4 Nb6 9. Be3 Bg4 10. Nbd2 f5 11. exf5 gxf5 12. Bg5 N8d7 13. Qb3+ Kh8 14. Rfe1 Nf6 15. h3 Bh5 16. Bd3 Nfd5 17. Qa3 Nc8 18. Bc4 b5 19. Bxd5 Qxd5 20. Bxe7 Nxe7 21. Rxe7 Rg8 22. Qb3 Rad8 23. Qxd5 Rxd5 24. Rc1 Bxd4 25. Nxd4 Rxd4 26. Nb3 Ra4 1/2-1/2

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "7"]
[White "Bergsma, Klaas"]
[Black "Prins, Lodewijk"]
[Result "0-1"]
[ECO "A57"]
[PlyCount "62"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 c5 3. d5 b5 4. c4 Bb7 5. a4 e6 6. dxe6 fxe6 7. axb5 Be7 8. e3 0-0 9. Be2 a6 10. Nc3 axb5 11. Rxa8 Bxa8 12. Nxb5 Ne4 13. 0-0 Bf6 14. Nd2 Ng5 15. f4 Nf7 16. Nb3 d6 17. Qc2 Bc6 18. Bd2 Qb6 19. Na5 Bxb5 20. cxb5 d5 21. Bd3 g6 22. b3 Bg7 23. Rc1 Rc8 24. Kh1 Nd6 25. Nc6 Nxc6 26. bxc6 Qxc6 27. Bb4 c4 28. Qe2 cxd3 29. Rxc6 Rxc6 30. Qe1 Bb2 31. Bd2 Ne4 0-1

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "2"]
[White "Czerniak, Moshe"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "B30"]
[PlyCount "123"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. g3 Nf6 4. d3 d5 5. exd5 Nxd5 6. Bg2 Bg4 7. h3 Bh5 8. 0-0 e6 9. Nbd2 Be7 10. a4 0-0 11. Nc4 Qc7 12. Re1 Rad8 13. c3 Bf6 14. a5 Bg6 15. Bf1 h6 16. Qb3 Rd7 17. Nh2 Ne5 18. Nxe5 Bxe5 19. Bd2 Rfd8 20. Ng4 Bd6 21. d4 cxd4 22. cxd4 Bc2 23. Qf3 Bb4 24. Bxb4 Nxb4 25. Rac1 Qxa5 26. Re5 Rd5 27. Bc4 Rxe5 28. Nxe5 Qc7 29. Qc3 a5 30. Bxe6 Qxc3 31. Bxf7+ Kf8 32. bxc3 Nd3 33. Rxc2 Nxe5 34. Bb3 Nc6 35. Ba4 Rc8 36. Rb2 Nd8 37. Rb3 Rc7 38. Kf1 Nf7 39. Ke2 Nd6 40. Kd3 Ke7 41. Bb5 Kd8 42. c4 Rf7 43. f4 Kc7 44. Ba4 b6 45. c5 bxc5 46. dxc5 Nb7 47. Kd4 Rf5 48. Rb6 Rf8 49. Rg6 Rf7 50. Rc6+ Kb8 51. Bb3 Rd7+ 52. Bd5 Ka7 53. Rc8 Re7 54. Kc4 a4 55. Kb4 Rd7 56. Bc6 Re7 57. Bxa4 Re1 58. Rc7 Rb1+ 59. Bb3 Kb8 60. Rxg7 Nxc5 61. Kxc5 Rxb3 62. f5 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "1"]
[White "Kovacs, Zoltan his"]
[Black "Bergsma, Klaas"]
[Result "1/2-1/2"]
[ECO "E28"]
[PlyCount "113"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[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 c5 5. a3 Bxc3+ 6. bxc3 b6 7. Bd3 Bb7 8. f3 Nc6 9. Ne2 0-0 10. e4 Ne8 11. Be3 d6 12. 0-0 Qd7 13. Nc1 f5 14. Bf2 Na5 15. exf5 exf5 16. Nb3 Nxb3 17. Qxb3 Nf6 18. Rfe1 g6 19. a4 Rfe8 20. Rxe8+ Rxe8 21. a5 Qc7 22. axb6 axb6 23. Rb1 Nd7 24. Qb2 Ba6 25. Ra1 Nb8 26. d5 Qd8 27. Bf1 Qc7 28. Bg3 Bc8 29. Qd2 Nd7 30. Bf4 Ne5 31. Ra3 Bd7 32. Qa2 Nf7 33. Ra7 Qd8 34. Qd2 Bc8 35. Bg3 Qf6 36. Bf4 g5 37. Bg3 f4 38. Bf2 Ne5 39. Qb2 g4 40. fxg4 Nxg4 41. Qd2 Qh6 42. h3 Ne3 43. Ra8 Qg5 44. Bxe3 fxe3 45. Qe2 Rf8 46. Kh2 Qf4+ 47. Kg1 Qg3 48. Kh1 h5 49. Qd3 h4 50. Be2 Qe1+ 51. Kh2 Qg3+ 52. Kh1 Qg5 53. Qe4 Bf5 54. Rxf8+ Kxf8 55. Qf3 Kg7 56. Kh2 Kh6 57. g3 1/2-1/2

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "4"]
[White "Kramer, Haije J"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "E58"]
[PlyCount "127"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[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 c5 5. Bd3 d5 6. Nf3 0-0 7. 0-0 Nc6 8. a3 Bxc3 9. bxc3 b6 10. cxd5 exd5 11. Ne5 Bb7 12. Nxc6 Bxc6 13. f3 Re8 14. Re1 Qd7 15. Bb2 Qb7 16. c4 dxc4 17. Bxc4 Rad8 18. Qc2 cxd4 19. Bxd4 Nd7 20. Qb2 Bd5 21. Bxd5 Qxd5 22. Bxg7 Ne5 23. Bxe5 Rxe5 24. e4 Qc5+ 25. Kh1 Qa5 26. Red1 Rc8 27. Rd3 Rce8 28. Rad1 b5 29. f4 R5e6 30. h3 Qb6 31. f5 Re5 32. Rg3+ Kh8 33. Rd5 f6 34. Rxe5 fxe5 35. Rd3 a6 36. Rd5 Qc7 37. Qd2 Qe7 38. Qh6 Rg8 39. Rd6 a5 40. Re6 Qd8 41. Rd6 Qe7 42. Qd2 Rf8 43. Qd5 b4 44. axb4 axb4 45. Rd7 Qf6 46. Rd6 Qe7 47. Rd7 Qf6 48. Qb7 Qh6 49. Qc7 Re8 50. Rd8 Rxd8 51. Qxd8+ Kg7 52. Qe7+ Kg8 53. Qe8+ Kg7 54. Qxe5+ Kg8 55. Qd5+ Kg7 56. Qd4+ Kf7 57. Qxb4 Qc1+ 58. Kh2 Qf4+ 59. Kg1 Qe3+ 60. Kf1 Qd3+ 61. Kf2 Qc2+ 62. Kf3 Qd3+ 63. Kf4 Qf1+ 64. Kg3 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "6"]
[White "Milic, Borislav"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "D30"]
[PlyCount "123"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 e6 3. b3 Be7 4. Bb2 0-0 5. g3 d5 6. Bg2 c5 7. 0-0 Nc6 8. cxd5 exd5 9. d4 Ne4 10. dxc5 Bxc5 11. Nc3 Nxc3 12. Bxc3 d4 13. Bb2 Bf5 14. Rc1 Bb6 15. Nh4 Be6 16. Ba3 Re8 17. Rxc6 bxc6 18. Bxc6 Bh3 19. Bxe8 Bxf1 20. Bc6 Rc8 21. Nf5 Bh3 22. Ne7+ Kh8 23. Nxc8 Qxc8 24. Bg2 Bf5 25. Qc1 Qe8 26. Qf4 Bg6 27. Bc6 Qd8 28. Qd6 Bb1 29. Qxd8+ Bxd8 30. Bc5 Bxa2 31. Bxa7 Bxb3 32. Bxd4 Be7 33. f4 Kg8 34. Kf2 Kf8 35. Kf3 Bd1 36. g4 Bb4 37. h4 Ba3 38. h5 Bb4 39. Be4 Kg8 40. Bd5 Kf8 41. Bc4 Ba3 42. g5 Ba4 43. h6 gxh6 44. gxh6 Bd7 45. e4 Kg8 46. f5 Bf8 47. Be3 Bd6 48. Bf4 Bxf4 49. Kxf4 Kf8 50. f6 Bc8 51. e5 Kg8 52. Bd3 Be6 53. Bf5 Bd5 54. Ke3 Bb3 55. Kd4 Bd1 56. Kc5 Be2 57. Kd6 Bf3 58. Ke7 Bh5 59. Bd7 Bg6 60. Be8 Kh8 61. e6 Bh5 62. Kd8 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1955.??.??"]
[Round "8"]
[White "Pilnik, Hermann"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "B45"]
[PlyCount "150"]
[EventDate "1955.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[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. Nxc6 bxc6 7. e5 Nd5 8. Ne4 Qc7 9. f4 Qb6 10. Bd3 Bb7 11. a3 Be7 12. Qe2 f5 13. Nf2 Bc5 14. 0-0 a5 15. c4 Ne7 16. b3 Bd4 17. Bb2 Bxb2 18. Qxb2 c5 19. Be2 Nc6 20. Bf3 Nd4 21. Bxb7 Qxb7 22. b4 a4 23. Nd3 Nb3 24. Rad1 0-0 25. Rf2 Rab8 26. bxc5 Rfc8 27. Qc3 Qa7 28. h3 Rc7 29. Rb2 Rbc8 30. Kh2 Qa8 31. Re2 Qa7 32. Re3 Rb8 33. Qe1 Nxc5 34. Nxc5 Qxc5 35. Red3 Qxc4 36. Qh4 h6 37. Rd4 Qc6 38. Rd6 Qc5 39. Qg3 Rb3 40. Qg6 Qf2 41. Rxe6 Qg3+ 42. Qxg3 Rxg3 43. Re7 Kf8 44. Rdxd7 Rxd7 45. Rxd7 Rxa3 46. Ra7 h5 47. e6 g6 48. Ra8+ Ke7 49. Rg8 Re3 50. Rxg6 Rxe6 51. Rg7+ Kd6 52. Rf7 Kc5 53. Rxf5+ Kb4 54. Rf8 a3 55. f5 Ra6 56. f6 Ka4 57. f7 Ra7 58. Re8 Rxf7 59. Re4+ Kb3 60. Re3+ Kb2 61. Re2+ Kc1 62. Kg3 Ra7 63. Kh4 a2 64. Re1+ Kb2 65. g4 hxg4 66. hxg4 a1Q 67. Rxa1 Rxa1 68. Kg5 Kc3 69. Kf6 Kd4 70. g5 Ra6+ 71. Kf5 Ra5+ 72. Kf6 Ke4 73. g6 Ra6+ 74. Kg5 Ke5 75. g7 Ra8 0-1

[Event "Hoogovens 11th"]
[Site "Beverwijk"]
[Date "1949.01.??"]
[Round "?"]
[White "Bergsma, Klaas"]
[Black "O'Kelly de Galway, Alberic"]
[Result "0-1"]
[ECO "A85"]
[PlyCount "82"]
[EventDate "1949.01.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. d4 f5 2. c4 e6 3. e3 Nf6 4. Bd3 b6 5. Nf3 Bb7 6. 0-0 Bd6 7. Nc3 0-0 8. b3 Ne4 9. Bb2 Rf6 10. Ne5 Rh6 11. f3 Qh4 12. fxe4 Qxh2+ 13. Kf2 fxe4 14. Be2 Rg6 15. Ke1 Rxg2 16. Kd2 Bxe5 17. dxe5 Nc6 18. Rh1 Qg3 19. Rg1 Nxe5 20. Rxg2 Qxg2 21. Qf1 Nf3+ 22. Kc2 Qg6 23. Rd1 Bc6 24. Nb5 Bxb5 25. cxb5 Rf8 26. Qh3 d5 27. Ba3 Rf5 28. Kb1 Rh5 29. Qf1 Rh2 30. Ka1 h5 31. Bb2 Qg2 32. Qxg2 Rxg2 33. Bf1 Rg1 34. Rc1 g5 35. a4 g4 36. Ka2 h4 37. Rxc7 Rxf1 38. Rg7+ Kf8 39. Rxg4 h3 40. Ba3+ Ke8 41. Rf4 e5 0-1

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.05.20"]
[Round "5"]
[White "Bergsma, Klaas"]
[Black "Van den Bosch, Johannes"]
[Result "1/2-1/2"]
[ECO "C86"]
[PlyCount "102"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[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. Qe2 b5 7. Bb3 0-0 8. c3 d6 9. d4 Bg4 10. Rd1 Qc8 11. Be3 Na5 12. Bc2 Nc4 13. Bc1 c5 14. dxc5 dxc5 15. Nbd2 Nxd2 16. Bxd2 Rd8 17. h3 Bh5 18. Bg5 Qe6 19. g4 Rxd1+ 20. Rxd1 Bg6 21. a3 h6 22. Bh4 h5 23. Nh2 Nxg4 24. hxg4 Bxh4 25. gxh5 Bh7 26. Qg4 Qxg4+ 27. Nxg4 Rd8 28. Rxd8+ Bxd8 29. Nxe5 c4 30. Nc6 Bg5 31. a4 Bc1 32. axb5 axb5 33. Nd4 b4 34. cxb4 Bxb2 35. Nc6 Ba3 36. b5 Bc5 37. Na5 c3 38. Nb3 Bb6 39. Kf1 Kf8 40. Ke2 f6 41. f3 Bg8 42. Kd3 Bf7 43. Kxc3 Bxh5 44. Bd1 Ke7 45. Be2 Kd7 46. Nd4 Bf7 47. Bc4 Bh5 48. Be6+ Kd6 49. Nf5+ Ke5 50. f4+ Kxf4 51. Nxg7 Be2 1/2-1/2

[Event "NED-chT 4041"]
[Site "Netherlands"]
[Date "1941.02.15"]
[Round "6.1"]
[White "Bergsma, Klaas"]
[Black "Prins, Lodewijk"]
[Result "1-0"]
[ECO "C97"]
[PlyCount "59"]
[EventDate "1940.10.19"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Rotterdam NRSV"]
[BlackTeam "Amsterdam Max Euwe"]
[WhiteTeamCountry "NED"]
[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 Na5 10. Bc2 c5 11. d4 Qc7 12. a4 Bd7 13. dxe5 dxe5 14. axb5 axb5 15. Nbd2 Nh5 16. Nf1 Rad8 17. Ne3 Nf4 18. Nd5 Nxd5 19. exd5 f6 20. Qd3 g6 21. Bh6 Rf7 22. Qe2 Nc4 23. b3 Nd6 24. Ra6 Qb7 25. Rea1 Qxd5 26. Rd1 Qe6 27. b4 cxb4 28. cxb4 Qc4 29. Bd3 Qc8 30. Qa2 1-0

[Event "NED-chT 4041"]
[Site "Netherlands"]
[Date "1941.01.25"]
[Round "5.1"]
[White "Cortlever, Nicolaas"]
[Black "Bergsma, Klaas"]
[Result "1/2-1/2"]
[ECO "A14"]
[PlyCount "101"]
[EventDate "1940.10.19"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam VAS"]
[BlackTeam "Rotterdam NRSV"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. 0-0 e6 5. b3 Be7 6. Bb2 c5 7. c4 0-0 8. Nc3 d5 9. Ne5 Nc6 10. f4 Rc8 11. Nb5 a6 12. Nxc6 Rxc6 13. Na3 Rc7 14. Be5 Bd6 15. e3 Qe7 16. Bxd6 Qxd6 17. Qe2 Rd8 18. d3 Rcd7 19. Rad1 Qc7 20. g4 dxc4 21. Nxc4 Bxg2 22. Kxg2 Nd5 23. Qd2 f6 24. a3 b5 25. Nb2 e5 26. fxe5 Qxe5 27. Rde1 Re7 28. e4 Nc7 29. Rf5 Qd6 30. Qc3 Ne6 31. Ref1 Rc7 32. h3 Nd4 33. Rd5 Qe7 34. Rxd8+ Qxd8 35. Nd1 Qd6 36. Rf2 Ne6 37. Ne3 Rd7 38. Nd5 Nc7 39. Rf5 Ne6 40. b4 cxb4 41. axb4 Rd8 42. Rf2 h6 43. Nxf6+ gxf6 44. Qxf6 Ng7 45. Qf7+ Kh7 46. Rf6 Qxd3 47. Qg6+ Kg8 48. Qf7+ Kh7 49. Qg6+ Kg8 50. Qf7+ Kh7 51. Qg6+ 1/2-1/2

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.01.06"]
[Round "7"]
[White "Bergsma, Klaas"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "A84"]
[PlyCount "81"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. c4 e6 2. Nc3 d5 3. d4 c6 4. e3 f5 5. g4 Nh6 6. gxf5 Nxf5 7. Nf3 Nd7 8. Bd3 Nf6 9. Qc2 g6 10. Bd2 Bg7 11. 0-0 0-0 12. Rad1 Ng4 13. Bc1 Qc7 14. Ne5 Bxe5 15. dxe5 Nxe5 16. f4 Nxc4 17. Bxc4 dxc4 18. Ne4 b5 19. b3 cxb3 20. Qxb3 a5 21. Bb2 a4 22. Qb4 c5 23. Nxc5 h6 24. e4 Ng7 25. Be5 Qa5 26. Qb2 Ra7 27. Rf3 b4 28. Qd4 Kh7 29. Qd6 Raf7 30. Qc6 Nh5 31. Nxe6 Bxe6 32. Qxe6 Qa7+ 33. Kh1 Qe7 34. Qxe7 Rxe7 35. Bd6 Rd7 36. Rd5 Rfd8 37. Bxb4 Rxd5 38. exd5 Rxd5 39. a3 Rd1+ 40. Kg2 Rd2+ 41. Bxd2 1-0

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "3"]
[White "Bergsma, Klaas"]
[Black "Kmoch, Hans"]
[Result "0-1"]
[ECO "C84"]
[PlyCount "72"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[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 b5 6. Bb3 Be7 7. a4 Bb7 8. axb5 axb5 9. Rxa8 Qxa8 10. d3 d6 11. Nc3 b4 12. Nd5 Nxd5 13. Bxd5 Nd8 14. Bxb7 Qxb7 15. Bd2 0-0 16. Qa1 Ne6 17. Qa4 b3 18. cxb3 Nc5 19. Qc4 Qxb3 20. Qxb3 Nxb3 21. Be3 Rb8 22. g3 g6 23. Re1 f5 24. Kg2 fxe4 25. dxe4 Rb4 26. Re2 Rxe4 27. Rc2 c5 28. Nd2 Nxd2 29. Rxd2 Kf7 30. Kf3 Rb4 31. Ke2 Ke6 32. Rc2 Rb5 33. Kd3 d5 34. f3 c4+ 35. Kd2 d4 36. Bf2 Kd5 0-1

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "1"]
[White "De Jong, Theodoor"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "E94"]
[PlyCount "80"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. Be2 Nbd7 7. 0-0 e5 8. d5 a5 9. Nd2 Ne8 10. Nb3 b6 11. Be3 Qe7 12. Nd2 f5 13. f3 Ndf6 14. exf5 gxf5 15. Qa4 Bd7 16. Qc2 Nh5 17. Rfe1 Qf6 18. Bf1 Bh6 19. Bxh6 Qxh6 20. Nb3 Kh8 21. Nc1 Rg8 22. Nd3 Rg7 23. Qf2 Nef6 24. Re2 Re8 25. Rae1 Rge7 26. Qh4 Qg6 27. Kh1 Qf7 28. Kg1 Ng7 29. Qf2 f4 30. g3 fxg3 31. hxg3 Qg6 32. Ne4 Nf5 33. Nxf6 Qxf6 34. f4 e4 35. Nc1 Nxg3 36. Re3 Nf5 37. Rc3 Rg7+ 38. Kh1 e3 39. Qh2 Ng3+ 40. Kg1 Qxf4 0-1

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "6"]
[White "Euwe, Max"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "E38"]
[PlyCount "83"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 Nc6 6. Nf3 Bxc5 7. Bg5 Nd4 8. Nxd4 Bxd4 9. Nb5 Bc5 10. 0-0-0 Qa5 11. Bd2 Qb6 12. Bf4 0-0 13. e3 a6 14. Nc3 Qa5 15. g4 d5 16. g5 Nh5 17. Qa4 Qxa4 18. Nxa4 Ba7 19. Bd6 Bd7 20. Nc3 Rfc8 21. cxd5 exd5 22. Bg2 Bc6 23. Bxd5 Bxd5 24. Rxd5 Rc4 25. Rhd1 f6 26. Be7 fxg5 27. Bxg5 Rc5 28. Rd8+ Rxd8 29. Rxd8+ Kf7 30. Rd7+ Ke6 31. Rxb7 Rxg5 32. Rxa7 Rg2 33. Rxa6+ Kf5 34. Ra5+ Kg6 35. Ne4 Rxh2 36. Rg5+ Kf7 37. a4 h6 38. Rd5 Ke6 39. Rd4 g5 40. a5 Nf6 41. Nxf6 Kxf6 42. Ra4 1-0

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "4"]
[White "Kramer, Haije J"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "E11"]
[PlyCount "124"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Be7 5. Bg2 d5 6. Qb3 0-0 7. Nf3 c6 8. 0-0 b6 9. cxd5 cxd5 10. Nc3 Nc6 11. Bf4 Bb7 12. Rfc1 Rc8 13. Qd1 Nh5 14. Bd2 f5 15. e3 Nf6 16. Ng5 Qd7 17. f4 Ne4 18. Ngxe4 fxe4 19. Bf1 Kh8 20. Be2 g5 21. Kh1 gxf4 22. gxf4 Bf6 23. Be1 Rg8 24. Bg3 Qg7 25. Qd2 Nxd4 26. exd4 Bxd4 27. Bf1 Qf6 28. Ne2 Bxb2 29. Rxc8 Bxa1 30. Rxg8+ Kxg8 31. Bf2 e3 32. Bxe3 d4+ 33. Bg2 Bxg2+ 34. Kxg2 dxe3 35. Qxe3 Qf5 36. a3 Bf6 37. Ng3 Qd5+ 38. Kh3 Bd4 39. Qe2 b5 40. Qg4+ Kh8 41. Qh4 Qd7 42. Qh5 a5 43. Qh6 Bg7 44. Qg5 Qd5 45. Qe7 Kg8 46. Qa7 b4 47. axb4 axb4 48. Qb8+ Bf8 49. Kg4 b3 50. f5 Qd4+ 51. Kh3 Qe3 52. fxe6 Qxe6+ 53. Kg2 Qc4 54. Kh3 Qc2 55. Qb5 Qc8+ 56. Kg2 Qe6 57. Qg5+ Kh8 58. Qb5 Bg7 59. Nf5 b2 60. Qb8+ Qg8 61. Qb5 Be5+ 62. Kf3 Qb8 0-1

[Event "NED-chT 4041"]
[Site "Netherlands"]
[Date "1940.12.01"]
[Round "3.1"]
[White "Bergsma, Klaas"]
[Black "Euwe, Max"]
[Result "0-1"]
[ECO "C47"]
[PlyCount "72"]
[EventDate "1940.10.19"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Rotterdam NRSV"]
[BlackTeam "Amsterdam ASC"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Bb4 6. Nxc6 bxc6 7. Bd3 d5 8. exd5 cxd5 9. 0-0 0-0 10. Bg5 Be6 11. Qf3 Be7 12. Rae1 Rb8 13. Nd1 d4 14. Qg3 g6 15. f4 Nh5 16. Qh4 Bxg5 17. fxg5 Ng7 18. Rf4 c5 19. Qh6 f5 20. Rh4 Rb6 21. Qxh7+ Kf7 22. Qh6 Bd5 23. b3 Re6 24. Rxe6 Nxe6 25. Qh7+ Ng7 26. Qh6 Re8 27. Nb2 Qe7 28. Rf4 Qe3+ 29. Rf2 Qc1+ 30. Rf1 Re1 31. Qh4 Rxf1+ 32. Bxf1 Qxb2 33. Qf4 d3 34. Bxd3 Ne6 35. Qf1 Qd4+ 36. Kh1 Nf4 0-1

[Event "NED-chT 4041"]
[Site "Netherlands"]
[Date "1940.10.27"]
[Round "1.1"]
[White "Van Doesburgh, Gerrit RD"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "C45"]
[PlyCount "110"]
[EventDate "1940.10.19"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Bussum"]
[BlackTeam "Rotterdam NRSV"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Nc2 d6 8. Be2 Qg6 9. Bf3 0-0 10. 0-0 Ne5 11. Re1 Bb6 12. Bh5 Qf6 13. Bxb6 axb6 14. Ne3 Be6 15. b3 Ra5 16. Nd2 Nd3 17. Rf1 Qxc3 18. Ndc4 Nb2 19. Qe2 Nxc4 20. Rac1 Qd2 21. Nxc4 Qxe2 22. Bxe2 Rxa2 23. Bf3 Ng6 24. Ne3 c5 25. Rfd1 Rd8 26. Nd5 Bxd5 27. Rxd5 Rb2 28. Rcd1 Rxb3 29. e5 Nf8 30. Rxd6 Re8 31. Bd5 Rb4 32. f4 Rxf4 33. Rxb6 Rb4 34. Rxb4 cxb4 35. Rb1 Rxe5 36. Bxb7 Rb5 37. Bc6 Rb6 38. Bd5 Ne6 39. Kf2 Kf8 40. Ke3 Ke7 41. g3 Kd6 42. Bc4 Ke5 43. Re1 f5 44. Kd3+ Kf6 45. Bd5 g5 46. Kc4 b3 47. Rb1 Ke5 48. Re1+ Kf6 49. Rb1 b2 50. Bf3 g4 51. Bd5 h5 52. Bg2 h4 53. Bd5 hxg3 54. hxg3 Rb8 55. Kc3 Nc5 0-1

[Event "Rotterdam Maas Cup"]
[Site "Rotterdam"]
[Date "1940.04.06"]
[Round "2"]
[White "Voorwinde, FJ."]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "B83"]
[PlyCount "52"]
[EventDate "1940.04.05"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Be7 7. 0-0 0-0 8. Kh1 Nc6 9. f4 Bd7 10. b3 Qb6 11. Ndb5 Rfd8 12. Na4 Qa5 13. Bd2 Nb4 14. c4 Nxe4 15. Be1 d5 16. Qb1 Bxb5 17. cxb5 Qc7 18. Bd1 Rac8 19. a3 Nc2 20. b6 axb6 21. Bxc2 Qxc2 22. Qxc2 Rxc2 23. Nxb6 Bf6 24. Rb1 Rd6 25. Na4 b5 26. Bb4 Rdc6 0-1

[Event "Rotterdam Maas Cup"]
[Site "Rotterdam"]
[Date "1940.04.05"]
[Round "1"]
[White "Kramer, Haije J"]
[Black "Bergsma, Klaas"]
[Result "1/2-1/2"]
[ECO "E95"]
[PlyCount "91"]
[EventDate "1940.04.05"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 0-0 5. Nf3 d6 6. Be2 Nbd7 7. 0-0 e5 8. Re1 c6 9. Bf1 Qc7 10. g3 Re8 11. Bg2 Nf8 12. d5 Bd7 13. h3 cxd5 14. cxd5 b5 15. a3 a5 16. Bd2 Qb7 17. b4 Rec8 18. bxa5 Rxa5 19. Qb3 Rca8 20. Nb1 R5a6 21. Bb4 Nh5 22. Nc3 f5 23. Ng5 Bf6 24. Ne6 Ng7 25. Nxg7 Kxg7 26. Ra2 f4 27. Ne2 g5 28. Rc1 Bd8 29. Rac2 Ng6 30. Kh2 R8a7 31. Ng1 Ba5 32. Bxa5 Rxa5 33. Rc7 Qb6 34. Rxa7 Qxa7 35. Qc3 Rxa3 36. Qc7 Ra6 37. Qd8 Nf8 38. Rc7 fxg3+ 39. fxg3 Qb6 40. Rxd7+ Nxd7 41. Qxd7+ Kg8 42. Qe8+ Kg7 43. Qe7+ Kg8 44. Qxg5+ Kh8 45. Qf6+ Kg8 46. h4 1/2-1/2

[Event "Bussum"]
[Site "Bussum"]
[Date "1940.03.10"]
[Round "3"]
[White "Euwe, Max"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "B83"]
[PlyCount "80"]
[EventDate "1940.03.09"]
[EventType "tourn"]
[EventRounds "3"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 d6 6. Be2 Nf6 7. 0-0 Be7 8. Kh1 0-0 9. f4 Bd7 10. Nb3 a6 11. Bf3 b5 12. e5 Ne8 13. a4 b4 14. Ne4 d5 15. Nec5 Na5 16. f5 Nxb3 17. Nxb3 Rc8 18. Nd4 Bc5 19. c3 a5 20. cxb4 Bxb4 21. Bg4 Qb6 22. f6 Rc4 23. Be3 Bc5 24. Rf4 g5 25. Nxe6 Bxe6 26. Rxc4 Bxe3 27. Rc2 d4 28. Bxe6 fxe6 29. Rc8 Qb7 30. Qc2 Qd7 31. Rd1 Bf4 32. Rc5 Nxf6 33. exf6 Rxf6 34. Rxa5 Be3 35. Qe4 Kg7 36. h3 h6 37. Qxe3 Rf1+ 38. Kh2 Qc7+ 39. Qe5+ Qxe5+ 40. Rxe5 Rxd1 1-0

[Event "NED Team-ch 1938/39"]
[Site "Netherlands"]
[Date "1939.01.15"]
[Round "2.1"]
[White "Bergsma, Klaas"]
[Black "Landau, Salo"]
[Result "1-0"]
[ECO "A29"]
[PlyCount "67"]
[EventDate "1938.12.04"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Rotterdam NRSV"]
[BlackTeam "Amsterdam VAS"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6 7. 0-0 Be7 8. a4 a5 9. d3 Be6 10. Be3 Nd5 11. Nxd5 Bxd5 12. Rc1 0-0 13. Bc5 Bxc5 14. Rxc5 Qd6 15. Qc1 f6 16. Qe3 Nd8 17. Nxe5 Bxg2 18. Nc4 Qd7 19. Kxg2 Ne6 20. Rxa5 Rxa5 21. Nxa5 Nd4 22. Qd2 Qxa4 23. Rc1 Nxe2 24. Rxc7 Re8 25. Nc4 Qa1 26. Ne3 Qg1+ 27. Kf3 Nd4+ 28. Kg4 Qxh2 29. Qa5 g5 30. Qd5+ Kh8 31. Qxd4 h5+ 32. Kf5 Qxf2+ 33. Kg6 Qf3 34. Rh7+ 1-0

[Event "NED Team-ch 1938/39"]
[Site "Netherlands"]
[Date "1938.12.11"]
[Round "1.1"]
[White "Bergsma, Klaas"]
[Black "Van Doesburgh, Gerrit RD"]
[Result "1-0"]
[ECO "C83"]
[PlyCount "75"]
[EventDate "1938.12.04"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Rotterdam NRSV"]
[BlackTeam "Bussum"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7 10. Nbd2 0-0 11. Bc2 f5 12. Nb3 Qd7 13. Re1 a5 14. Nbd4 Nxd4 15. Nxd4 c5 16. Nxe6 Qxe6 17. f3 Ng5 18. a4 b4 19. cxb4 axb4 20. Be3 c4 21. Qd2 Nf7 22. f4 b3 23. Bd1 Rfd8 24. Bf3 Rac8 25. Bd4 Rd7 26. Red1 Nd8 27. Kh1 Nc6 28. a5 Bb4 29. Bc3 Bxc3 30. Qxc3 d4 31. Qe1 Na7 32. Qb4 Kf7 33. a6 Rcd8 34. Bb7 d3 35. Qc5 d2 36. Ra4 Rd4 37. Qxa7 Qd7 38. Rxc4 1-0

[Event "NED Team-ch 1937/38"]
[Site "Netherlands"]
[Date "1938.02.13"]
[Round "4.1"]
[White "Landau, Salo"]
[Black "Bergsma, Klaas"]
[Result "1/2-1/2"]
[ECO "E46"]
[PlyCount "92"]
[EventDate "1937.11.07"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam VAS"]
[BlackTeam "Rotterdam NRSV"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 0-0 5. Nge2 d5 6. a3 Be7 7. Nf4 c6 8. Be2 Nbd7 9. cxd5 exd5 10. 0-0 Bd6 11. Qc2 Re8 12. b4 Nf8 13. b5 Qc7 14. bxc6 bxc6 15. g3 g5 16. Ng2 Ne4 17. Nxe4 dxe4 18. f4 h6 19. Bb2 Rb8 20. Qc3 Be6 21. d5 Rxb2 22. Qxb2 Bxd5 23. Qf6 Ng6 24. Bh5 Re6 25. Qd4 gxf4 26. Nxf4 Nxf4 27. gxf4 f5 28. Kf2 Bxf4 29. exf4 Qxf4+ 30. Ke1 Qh4+ 31. Kd2 e3+ 32. Kc3 Qxh5 33. Rg1+ Rg6 34. Rab1 Rg4 35. Qxa7 Bf7 36. Rb8+ Kh7 37. Rxg4 fxg4 38. Rb7 Qe5+ 39. Qd4 Qe6 40. Rb4 c5 41. Qe4+ Kg7 42. Qxg4+ Kh7 43. Qe4+ Kg7 44. Qg2+ Kh7 45. Qc2+ Kg7 46. Qg2+ Kh7 1/2-1/2

[Event "Den Haag Keusbeker-06"]
[Site "The Hague"]
[Date "1937.12.25"]
[Round "1"]
[White "Bergsma, Klaas"]
[Black "Fontein, George Salto"]
[Result "0-1"]
[ECO "C90"]
[PlyCount "62"]
[EventDate "1937.12.25"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[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 Na5 9. Bc2 c5 10. d4 Qc7 11. a4 b4 12. cxb4 cxb4 13. h3 0-0 14. Nbd2 Be6 15. Nf1 Rfc8 16. Ne3 g6 17. b3 Nh5 18. Bb2 f6 19. Rc1 Qb7 20. Kh2 Rc7 21. Ng1 Rac8 22. Ne2 Kf7 23. g3 Bf8 24. d5 Bd7 25. f4 Qb6 26. Qd3 Rxc2 27. Rxc2 Rxc2 28. Nxc2 Qf2+ 29. Kh1 Bxh3 30. Rg1 Bg4 31. Ncd4 exd4 0-1

[Event "Match/Nation NED-ENG (4,5-5,5) (6-4)"]
[Site "Amsterdam"]
[Date "1937.05.16"]
[Round "1.8"]
[White "Lenton, Alfred"]
[Black "Bergsma, Klaas"]
[Result "1/2-1/2"]
[ECO "A14"]
[PlyCount "105"]
[EventDate "1937.05.16"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "England"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ENG"]
[BlackTeamCountry "NED"]

1. Nf3 Nf6 2. c4 e6 3. b3 Be7 4. Bb2 0-0 5. g3 d5 6. Bg2 c5 7. 0-0 Nc6 8. cxd5 Nxd5 9. e4 Ndb4 10. d4 Nxd4 11. Nxd4 cxd4 12. Bxd4 e5 13. Bxe5 Qxd1 14. Rxd1 Nc2 15. Nc3 Nxa1 16. Nd5 Bd8 17. Rxa1 Be6 18. Rc1 Rc8 19. Rd1 Re8 20. Bd4 Rc2 21. Nb4 Rc8 22. Bxa7 Be7 23. Nd5 Bc5 24. Bxc5 Rxc5 25. f4 Kf8 26. Rd2 Rec8 27. Ne3 Re8 28. Kf2 f6 29. Bf1 Ke7 30. b4 Rc1 31. Bg2 Rd8 32. Nd5+ Bxd5 33. exd5 Kd6 34. Re2 Rdc8 35. Re6+ Kd7 36. Be4 Re8 37. Rxe8 Kxe8 38. d6 b6 39. Bxh7 Ra1 40. Bg8 Rb1 41. Bb3 Rb2+ 42. Kf3 Rxh2 43. Ba4+ Kd8 44. Bc6 Rxa2 45. b5 Rd2 46. d7 Kc7 47. g4 Rh2 48. Ke4 g6 49. f5 g5 50. Kf3 Rh3+ 51. Kg2 Rh8 52. Kf3 Kd6 53. Ke4 1/2-1/2

[Event "NED Team-ch 1936/37"]
[Site "Netherlands"]
[Date "1936.12.06"]
[Round "2.1"]
[White "Landau, Salo"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "E08"]
[PlyCount "39"]
[EventDate "1936.11.08"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam VAS"]
[BlackTeam "Rotterdam NRSV"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d5 7. Bf4 c6 8. Nbd2 Ne4 9. Qc2 Nd7 10. Ne5 Nxe5 11. Bxe5 Bd7 12. Rac1 Qa5 13. Nb3 Qd8 14. Nc5 Nxc5 15. dxc5 Bf6 16. Bd6 Be7 17. Be5 Bf6 18. Qc3 Be8 19. Rfd1 Bxe5 20. Qxe5 1-0

[Event "NED Team-ch 1936/37"]
[Site "Netherlands"]
[Date "1936.11.15"]
[Round "1.1"]
[White "Van Doesburgh, Gerrit RD"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "A85"]
[PlyCount "47"]
[EventDate "1936.11.08"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Bussum"]
[BlackTeam "Rotterdam NRSV"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 e6 2. c4 f5 3. Nc3 Nf6 4. Bg5 Bb4 5. Qc2 h6 6. Bxf6 Qxf6 7. a3 Bxc3+ 8. Qxc3 Nc6 9. e3 a5 10. g3 0-0 11. f4 d6 12. Bg2 Re8 13. Ne2 e5 14. d5 Nd8 15. 0-0-0 b6 16. Rde1 Nb7 17. Kd2 Nc5 18. b3 exf4 19. Qxf6 fxe3+ 20. Kc3 gxf6 21. Rhf1 Bd7 22. Nd4 Re5 23. Nf3 e2 24. Rf2 0-1

[Event "NED Team-ch 1935/36"]
[Site "Netherlands"]
[Date "1936.01.12"]
[Round "3.2"]
[White "Bergsma, Klaas"]
[Black "Van Steenis, Hendrik Jan"]
[Result "0-1"]
[ECO "B14"]
[PlyCount "62"]
[EventDate "1935.11.03"]
[EventType "team-tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Rotterdam NRSV"]
[BlackTeam "Utrecht"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Nc6 7. Be3 Be7 8. c5 0-0 9. Bb5 Bd7 10. 0-0 Rc8 11. a3 Ne4 12. Rc1 f5 13. b4 f4 14. Bd2 g5 15. Bxc6 Bxc6 16. Ne5 Bf6 17. f3 Nxd2 18. Qxd2 Bxe5 19. dxe5 d4 20. Ne2 d3 21. Nc3 Qd4+ 22. Kh1 Rf5 23. Rce1 Rd8 24. Ne4 Rxe5 25. Nd6 Re3 26. h3 h5 27. Kh2 Rd7 28. Rd1 g4 29. fxg4 Re2 30. Qxe2 dxe2 31. Rxd4 exf1Q 0-1

[Event "NED Team-ch 1934/35 relegation"]
[Site "Netherlands"]
[Date "1935.07.06"]
[Round "2.4"]
[White "Van der Velden, B."]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "D24"]
[PlyCount "70"]
[EventDate "1935.06.29"]
[EventType "team"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]
[WhiteTeam "Haarlem HSG"]
[BlackTeam "Bussum"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 d5 2. Nf3 Nf6 3. c4 dxc4 4. Nc3 a6 5. a4 c5 6. d5 e6 7. e4 exd5 8. exd5 Bd6 9. Qe2+ Be7 10. Qxc4 0-0 11. Be3 b5 12. Qd3 b4 13. Ne4 Nxd5 14. Bxc5 Bxc5 15. 0-0-0 Qe7 16. Qxd5 Bb7 17. Qxc5 Rc8 18. Qxc8+ Bxc8 19. Bc4 Be6 20. Rhe1 Nd7 21. Nd6 Nb6 22. Bxe6 fxe6 23. Ne5 Nxa4 24. Ndf7 b3 25. Rd2 Rc8+ 26. Kb1 Nb6 27. Rd6 Nd5 28. Rc1 Rxc1+ 29. Kxc1 g6 30. g3 Qc7+ 31. Rc6 Qa5 32. Kd1 Qa1+ 33. Ke2 Qxb2+ 34. Kf3 Qb1 35. Rxe6 Qf5+ 0-1

[Event "NED Team-ch 1934/35"]
[Site "Netherlands"]
[Date "1935.03.10"]
[Round "5.4"]
[White "Verweij de Winter, JM."]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "A48"]
[PlyCount "66"]
[EventDate "1934.11.04"]
[EventType "team"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]
[WhiteTeam "Utrecht"]
[BlackTeam "Bussum"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. Nf3 Nf6 2. d4 g6 3. b3 Bg7 4. Bb2 0-0 5. e3 d6 6. Be2 Nbd7 7. 0-0 e5 8. Nbd2 Re8 9. c4 b6 10. Qc2 Bb7 11. d5 Qe7 12. b4 Nh5 13. a4 f5 14. Ra3 Nhf6 15. a5 Nf8 16. a6 Bc8 17. Rd1 h6 18. Nf1 Bd7 19. c5 Rec8 20. Bc4 Kh8 21. Qe2 Ne4 22. Ng3 bxc5 23. Nxe4 fxe4 24. Nd2 cxb4 25. Ra5 Bf5 26. Bb5 Nd7 27. Bxd7 Qxd7 28. Qc4 c5 29. dxc6 Qxc6 30. Qxb4 Rab8 31. Qa3 Qc2 32. Qa1 Rxb2 33. Nf1 Qxf2+ 0-1

[Event "NED Team-ch 1925/26"]
[Site "Netherlands"]
[Date "1926.01.24"]
[Round "3.6"]
[White "Rueb, Alexander"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "B56"]
[PlyCount "81"]
[EventDate "1925.11.01"]
[EventType "team"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]
[WhiteTeam "The Hague DD"]
[BlackTeam "Amsterdam VAS"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bb5 Bd7 7. 0-0 e6 8. Be3 Be7 9. f4 Qc7 10. Kh1 0-0 11. Nf3 Rac8 12. a3 a6 13. Bd3 Na5 14. Nd2 b5 15. Qe2 Nc4 16. Bxc4 bxc4 17. Rae1 Rfd8 18. e5 Nd5 19. Bd4 Nxc3 20. Bxc3 Be8 21. exd6 Bxd6 22. Qg4 Bf8 23. Ne4 f5 24. Nf6+ Kh8 25. Nxe8 Rxe8 26. Qh5 Bd6 27. Rf3 Kg8 28. Rg3 Bf8 29. Qg5 Rcd8 30. Rge3 Qf7 31. Qg3 Bc5 32. Rxe6 Rxe6 33. Rxe6 Bf2 34. Qxf2 Qxe6 35. h3 Rd7 36. Qf3 h6 37. Kh2 Kh7 38. h4 Re7 39. Qf2 Rf7 40. Qd4 Rd7 41. Qf2 0-1

[Event "NED Team-ch 1925/26"]
[Site "Netherlands"]
[Date "1925.12.20"]
[Round "2.5"]
[White "Spaans, DCW"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "B62"]
[PlyCount "82"]
[EventDate "1925.11.01"]
[EventType "team"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam ASC"]
[BlackTeam "Amsterdam VAS"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e6 7. Nxc6 bxc6 8. e5 dxe5 9. Qxd8+ Kxd8 10. Bg5 Be7 11. 0-0-0+ Nd7 12. Be3 Kc7 13. Bf3 Ba6 14. a3 f5 15. g3 Nb6 16. Bxb6+ axb6 17. Rhe1 Bg5+ 18. Kb1 Bf6 19. Bg2 e4 20. f3 exf3 21. Bxf3 e5 22. Bg2 Rad8 23. Bh3 g6 24. g4 Bc8 25. gxf5 gxf5 26. Rxd8 Rxd8 27. Rf1 f4 28. Bxc8 Rxc8 29. Ne4 Rf8 30. Rg1 Rf7 31. Kc1 Be7 32. Kd2 Kd7 33. Ke2 Ke6 34. Kf3 Rf5 35. a4 Rh5 36. Nf2 Bc5 37. Rg2 Bxf2 38. Rxf2 Kf5 39. b4 Rh3+ 40. Ke2 Ra3 41. Rf3 Rxa4 0-1

[Event "Amsterdam VAS Winter 1925/26 +"]
[Site "Amsterdam"]
[Date "1925.12.??"]
[Round "1"]
[White "Euwe, Max"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "C56"]
[PlyCount "39"]
[EventDate "1925.12.??"]
[EventType "tourn"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. 0-0 Bc5 6. e5 Ng4 7. c3 d5 8. exd6 Qxd6 9. Re1+ Kf8 10. b4 Bb6 11. b5 Nce5 12. Nxe5 Nxe5 13. Ba3 Bc5 14. Rxe5 Bxa3 15. Rd5 Qe7 16. Nxa3 Be6 17. Rxd4 Qxa3 18. Bxe6 fxe6 19. Rd8+ Kf7 20. Rd7+ 1-0

[Event "Alekhine sim"]
[Site "Amsterdam"]
[Date "1925.??.??"]
[Round "?"]
[White "Alekhine, Alexander"]
[Black "Bergsma, Klaas"]
[Result "1-0"]
[ECO "C12"]
[PlyCount "69"]
[EventDate "1925.??.??"]
[EventType "simul"]
[EventRounds "1"]
[EventCountry "NED"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 e6 2. e4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. Nge2 dxe4 6. a3 Be7 7. Bxf6 gxf6 8. Nxe4 b6 9. Nf4 Bb7 10. Bb5+ c6 11. Bc4 Qc7 12. Nh5 Nd7 13. Ng7+ Kf8 14. Bxe6 Qf4 15. Ng3 Rg8 16. N7h5 Qc7 17. Bf5 Re8 18. Qc1 Bd6+ 19. Kd1 Ke7 20. Qh6 Kd8 21. Qxh7 Rgf8 22. Bxd7 Qxd7 23. Qf5 Re6 24. Nxf6 Qe7 25. Nge4 Bc7 26. f3 Kc8 27. Nh7 Rd8 28. Nhg5 Rxd4+ 29. Kc1 c5 30. Nxe6 fxe6 31. Qg4 Bxe4 32. fxe4 Qf7 33. Kb1 Qf6 34. Ka2 Qe5 35. Rae1 1-0

[Event "Lasker Emanuel sim"]
[Site "Amsterdam"]
[Date "1924.??.??"]
[Round "?"]
[White "Lasker, Emanuel"]
[Black "Bergsma, Klaas"]
[Result "0-1"]
[ECO "C11"]
[PlyCount "62"]
[EventDate "1924.??.??"]
[EventType "simul"]
[EventRounds "1"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Nc6 7. g3 Bxc5 8. Qg4 0-0 9. Bd3 f5 10. Qh3 Nd4 11. g4 h6 12. Nge2 Qh4+ 13. Qxh4 Nf3+ 14. Kd1 Nxh4 15. h3 Be7 16. gxf5 Nxf5 17. Bxf5 Rxf5 18. Nd4 Rh5 19. Nxe6 Nxe5 20. Nc7 Bg4+ 21. Ke1 Rc8 22. N7xd5 Bh4+ 23. Kf1 Bf3 24. Rh2 Bxd5 25. Nxd5 Nf3 26. Rf2 Rxd5 27. Rxf3 Rxc2 28. Be3 Rd3 29. Rb1 Rh2 30. Rc1 Kh7 31. Kg1 Rxb2 0-1

