[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "2"]
[White "De Rooi, Paul"]
[Black "Karper, Jacob G"]
[Result "0-1"]
[ECO "C10"]
[PlyCount "94"]
[EventDate "1965.??.??"]
[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 e6 3. Nc3 d5 4. Bg5 Nbd7 5. e4 dxe4 6. Nxe4 Be7 7. Nxf6+ Nxf6 8. Bc4 Nd5 9. Bxe7 Qxe7 10. 0-0 Nb6 11. Bd3 Bd7 12. Re1 Kf8 13. c4 Re8 14. Qc2 g6 15. Re3 Qd8 16. Ne5 Rg8 17. Rf3 f5 18. Be4 Bc8 19. Rd3 fxe4 20. Re3 Nd7 21. Qxe4 Nxe5 22. Qxe5 Rg7 23. Rae1 Kg8 24. Re4 Rf8 25. h4 Qf6 26. Qg3 g5 27. h5 h6 28. R1e3 Qd8 29. f3 Qd6 30. Qe1 c6 31. c5 Qc7 32. b4 Rf4 33. a4 Rgf7 34. Qb1 R7f6 35. b5 Bd7 36. b6 axb6 37. cxb6 Qd6 38. a5 Rxe4 39. Rxe4 Qa3 40. Qe1 Kg7 41. Qg3 Qxa5 42. Qc7 Qd5 43. Qxb7 Qd6 44. Qa7 Rf5 45. Qa1 Kf7 46. Qa8 Rb5 47. Qh8 Qf8 0-1

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "4"]
[White "Enevoldsen, Jens"]
[Black "Karper, Jacob G"]
[Result "1/2-1/2"]
[ECO "B91"]
[PlyCount "62"]
[EventDate "1965.??.??"]
[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 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. g3 e5 7. Nb3 Be7 8. Bg2 0-0 9. 0-0 Nbd7 10. Re1 b6 11. Bg5 Bb7 12. Bxf6 Nxf6 13. Nd2 Qc7 14. Nf1 b5 15. a3 Rfd8 16. Ne3 Bc6 17. Qd3 Bf8 18. Bh3 Qb7 19. Ncd5 Nxd5 20. exd5 Bd7 21. Bxd7 Qxd7 22. c4 g6 23. cxb5 axb5 24. Nc2 Rdc8 25. Nb4 Rc5 26. Rad1 Bg7 27. Re2 f5 28. f3 Re8 29. Rde1 Qf7 30. Kg2 Bf6 31. Rd1 Kg7 1/2-1/2

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "1"]
[White "Karper, Jacob G"]
[Black "De Graaff, RAG"]
[Result "1-0"]
[ECO "E00"]
[PlyCount "103"]
[EventDate "1965.??.??"]
[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. g3 Bb4+ 4. Nd2 0-0 5. a3 Bxd2+ 6. Qxd2 d5 7. Qc2 Nc6 8. Nf3 dxc4 9. Qxc4 e5 10. dxe5 Be6 11. Qc2 Ng4 12. Bg2 f6 13. 0-0 fxe5 14. Ng5 Bf5 15. Qc4+ Kh8 16. Nf7+ Rxf7 17. Qxf7 Nd4 18. Qc4 b5 19. Qd5 Qxd5 20. Bxd5 Nxe2+ 21. Kg2 Rd8 22. Bf3 Nd4 23. Bxg4 Bxg4 24. f3 Bc8 25. Be3 Nc2 26. Bg5 Rf8 27. Rac1 Bf5 28. Rf2 h6 29. Be7 Ne3+ 30. Kg1 Re8 31. Bc5 Nd5 32. Re1 Nf6 33. Rfe2 e4 34. Bd4 Nd7 35. fxe4 Bg4 36. Rf2 c5 37. Bc3 a5 38. Rf7 b4 39. Bxg7+ Kg8 40. Rf4 h5 41. Bf6 Re6 42. e5 c4 43. axb4 axb4 44. Kg2 c3 45. h3 c2 46. hxg4 Nxe5 47. Bxe5 Rxe5 48. Rc1 b3 49. Rf3 hxg4 50. Rxb3 Re2+ 51. Kf1 Rh2 52. Ke1 1-0

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "3"]
[White "Karper, Jacob G"]
[Black "Ghitescu, Theodor"]
[Result "1/2-1/2"]
[ECO "A81"]
[PlyCount "63"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nh3 Bg7 5. Nc3 d6 6. Nf4 e5 7. dxe5 dxe5 8. Qxd8+ Kxd8 9. Nfd5 c6 10. Nxf6 Bxf6 11. e4 Be6 12. Be3 Nd7 13. 0-0 Kc7 14. Na4 Rad8 15. Rfd1 b6 16. Rac1 Nb8 17. a3 Rxd1+ 18. Rxd1 Nd7 19. b4 Be7 20. Rd3 Bd6 21. Rc3 f4 22. gxf4 exf4 23. e5 Nxe5 24. Bxf4 Nc4 25. Bxd6+ Kxd6 26. Bf1 b5 27. Nc5 Bd5 28. Bxc4 bxc4 29. Re3 Rb8 30. Ne4+ Ke5 31. Nc3+ Kd6 32. Ne4+ 1/2-1/2

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "5"]
[White "Karper, Jacob G"]
[Black "Hartoch, Robert G"]
[Result "0-1"]
[ECO "A54"]
[PlyCount "258"]
[EventDate "1965.??.??"]
[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 d6 3. Nc3 e5 4. Nf3 Nbd7 5. Bg5 Be7 6. e3 0-0 7. Be2 Ne8 8. Bxe7 Qxe7 9. Qc2 c6 10. 0-0-0 a6 11. d5 c5 12. h4 f5 13. g3 Ndf6 14. Ng5 Rb8 15. Rdg1 h6 16. Nh3 Ng4 17. Qd2 e4 18. Nf4 Ne5 19. h5 Nf6 20. Qc2 Bd7 21. a4 Qe8 22. b3 Qe7 23. Kd2 Nh7 24. Ng6 Nxg6 25. hxg6 Nf6 26. Ra1 a5 27. Rh4 Be8 28. Bh5 Nxh5 29. Rxh5 Bxg6 30. Rh2 Bf7 31. Rah1 h5 32. Ne2 Qe5 33. Nf4 g6 34. Qc3 Qxc3+ 35. Kxc3 Kg7 36. Kd2 Kf6 37. Ne2 Rh8 38. Nc3 Be8 39. Ke2 Bd7 40. Rh4 Rh7 41. Kd2 Rbh8 42. R4h2 g5 43. Ne2 h4 44. Ke1 Be8 45. Nc3 Kg6 46. gxh4 Rxh4 47. Rxh4 Rxh4 48. Rg1 Kf6 49. Ne2 Bh5 50. Nc3 Bg4 51. Nb5 Ke5 52. Nc7 Rh5 53. Ne6 Kf6 54. Nd8 b6 55. Nc6 Bf3 56. Na7 Ke7 57. Nc6+ Kd7 58. Nb8+ Ke8 59. Nc6 Rh1 60. Rxh1 Bxh1 61. Na7 Bf3 62. Nb5 Ke7 63. Nc7 Bh5 64. Ne6 Kf6 65. Kd2 Bf7 66. Nc7 Ke7 67. Nb5 Be8 68. Nc3 Bd7 69. Ke1 Kf6 70. Kf1 Ke5 71. Kg2 f4 72. Kh2 Be8 73. Kg2 Bh5 74. Kh2 Bf3 75. Kg1 g4 76. Kf1 g3 77. exf4+ Kxf4 78. fxg3+ Kxg3 79. Ke1 Kf4 80. Nb5 Ke5 81. Kd2 e3+ 82. Kxe3 Bd1 83. Kd3 Bxb3 84. Kc3 Bxa4 85. Nc7 Bd7 86. Na8 b5 87. cxb5 Bxb5 88. Nc7 Bd7 89. Kc4 Kf6 90. Na6 a4 91. Nc7 Ke7 92. Kc3 Kd8 93. Na8 Kc8 94. Nb6+ Kc7 95. Nc4 Bb5 96. Ne3 Bd7 97. Kb2 Kd8 98. Kc3 Ke7 99. Kb2 Bb5 100. Nf5+ Kd7 101. Ne3 Bd3 102. Ka3 Ke7 103. Kxa4 Kf6 104. Kb3 Ke5 105. Kc3 Be2 106. Kd2 Bf3 107. Kd3 Bxd5 108. Ng4+ Ke6 109. Ne3 Ba2 110. Nd1 d5 111. Nc3 Bc4+ 112. Kd2 d4 113. Ne4 Kd5 114. Nf6+ Ke5 115. Nd7+ Kd6 116. Nf6 Bb5 117. Ne4+ Kd5 118. Nf6+ Ke5 119. Ng4+ Kd6 120. Nf2 c4 121. Kc2 Bd7 122. Kb2 Bf5 123. Ka3 Kc5 124. Nh1 d3 125. Kb2 Kd4 126. Nf2 c3+ 127. Kc1 d2+ 128. Kd1 Ke3 129. Nd3 Bg4+ 0-1

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "9"]
[White "Karper, Jacob G"]
[Black "Orbaan, Constant"]
[Result "0-1"]
[ECO "A54"]
[PlyCount "70"]
[EventDate "1965.??.??"]
[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 d6 3. Nc3 e5 4. Nf3 Nc6 5. dxe5 Nxe5 6. Nxe5 dxe5 7. Qxd8+ Kxd8 8. Bg5 c6 9. 0-0-0+ Kc7 10. Bh4 Bb4 11. Bg3 Bxc3 12. bxc3 Re8 13. f3 Nd7 14. e4 f6 15. Kc2 Nf8 16. Bf2 Be6 17. a3 Nd7 18. c5 b6 19. cxb6+ axb6 20. Ra1 Ra5 21. Bd3 b5 22. Rhb1 Rea8 23. Kb2 c5 24. a4 bxa4 25. Ka3 Bb3 26. Rb2 Nb6 27. Be2 Rd8 28. Be3 Kc6 29. Rbb1 Ra7 30. c4 Rad7 31. Rc1 Rd3 32. Bxd3 Rxd3 33. Bg1 Nxc4+ 34. Rxc4 Bxc4+ 35. Kxa4 Bb5+ 0-1

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "7"]
[White "Karper, Jacob G"]
[Black "Plater, Kazimierz"]
[Result "1/2-1/2"]
[ECO "B08"]
[PlyCount "55"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 g6 2. e4 Bg7 3. Nc3 d6 4. Nf3 Nf6 5. Be2 0-0 6. 0-0 c6 7. Be3 Nbd7 8. Qd2 b5 9. e5 dxe5 10. dxe5 Ng4 11. e6 fxe6 12. Ng5 Nxe3 13. Qxe3 Ne5 14. Rad1 Qb6 15. Qg3 b4 16. Na4 Qa5 17. b3 c5 18. f4 Nc6 19. Bd3 Rf6 20. Qh4 h6 21. Ne4 Rf5 22. Ng3 Rf6 23. Be4 Qc7 24. Bd3 Nd4 25. Ne4 Rf5 26. Ng3 Rf6 27. Ne4 Rf5 28. Ng3 1/2-1/2

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "8"]
[White "Milic, Borislav"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "B92"]
[PlyCount "97"]
[EventDate "1965.??.??"]
[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 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be6 8. 0-0 Nbd7 9. Be3 Be7 10. f3 0-0 11. a4 b6 12. Kh1 Qc7 13. Nd5 Nxd5 14. exd5 Bf5 15. c4 a5 16. f4 f6 17. fxe5 fxe5 18. Bg4 Bxg4 19. Qxg4 Nc5 20. Bxc5 bxc5 21. Qe6+ Kh8 22. Nd2 Rab8 23. b3 Rf6 24. Rxf6 Bxf6 25. Ne4 Qe7 26. Nxd6 Qxe6 27. dxe6 Rxb3 28. g3 Kg8 29. Rd1 Rb6 30. Kg2 e4 31. Nxe4 Rxe6 32. Nxf6+ gxf6 33. Kf3 Kf7 34. Rd5 Rc6 35. Rd7+ Ke6 36. Rxh7 Ke5 37. Rd7 Rb6 38. Rd5+ Ke6 39. Rxc5 Rb4 40. Rxa5 Rxc4 41. h4 f5 42. Ra6+ Ke5 43. Ra8 Rc3+ 44. Kg2 Ra3 45. a5 Ra2+ 46. Kh3 Ra3 47. a6 Kf6 48. a7 Kg7 49. Kg2 1-0

[Event "IBM-B"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "6"]
[White "Szilagyi, Gyorgy"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "A02"]
[PlyCount "143"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. f4 Nf6 2. Nf3 g6 3. b3 Bg7 4. Bb2 0-0 5. e3 d6 6. Qc1 Nbd7 7. Be2 Qe8 8. Na3 c6 9. 0-0 Qd8 10. c4 Re8 11. d3 e5 12. fxe5 Nxe5 13. Nxe5 dxe5 14. Nc2 Bg4 15. Qe1 Qd7 16. Rd1 Rad8 17. Bc3 Bxe2 18. Qxe2 Qe6 19. Be1 Qg4 20. Qxg4 Nxg4 21. Bh4 Rd6 22. h3 Nh6 23. g4 f5 24. g5 Nf7 25. Kf2 Rd7 26. Ke2 Nd8 27. Be1 Ne6 28. h4 Red8 29. Ba5 b6 30. Bb4 c5 31. Ba3 a5 32. Bc1 Nc7 33. e4 f4 34. Bb2 Ne6 35. Rf3 Rf7 36. Rdf1 Kf8 37. Ne3 Nc7 38. R3f2 Rdd7 39. Nd5 Nxd5 40. exd5 Ke7 41. Kf3 Kd6 42. Re1 Rf5 43. a4 Rd8 44. Rfe2 Rh8 45. Re4 h6 46. gxh6 Rxh6 47. b4 Rxh4 48. d4 cxd4 49. Bxd4 Rh3+ 50. Kg2 Rg3+ 51. Kf2 Rh5 52. Bxb6 Rh2+ 53. Kf1 Rh1+ 54. Kf2 Rh2+ 55. Kf1 axb4 56. a5 Rh1+ 57. Kf2 Rh2+ 58. Kf1 Bf6 59. a6 Ra3 60. a7 Bh4 61. Rd1 Rh1+ 62. Bg1 Bd8 63. c5+ Kc7 64. Kg2 Rh4 65. Rxe5 Rxa7 66. Re6 g5 67. Bd4 f3+ 68. Kxf3 Rxd4 69. Rxd4 Rb7 70. Ra6 b3 71. d6+ Kc8 72. c6 1-0

[Event "NED-ch18 sf"]
[Site "Amsterdam"]
[Date "1955.07.26"]
[Round "7"]
[White "Van den Berg, Carel"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "C19"]
[PlyCount "67"]
[EventDate "1955.07.19"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[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 Bd7 9. Be2 Qa5 10. 0-0 c4 11. Qd2 0-0 12. Ba3 Rfe8 13. h4 Qd8 14. g3 Nf5 15. Rfe1 Rc8 16. Bf1 Na5 17. Bc1 Rc6 18. Bh3 Ra6 19. h5 b6 20. Bxf5 exf5 21. h6 g6 22. Ng5 Nb7 23. Nh3 Bxa4 24. Nf4 b5 25. Qe2 Nd6 26. exd6 Rxe2 27. Rxe2 Rxd6 28. Ba3 Re6 29. Nxe6 fxe6 30. Rxe6 Bxc2 31. Bb4 Ba4 32. Rae1 Kf7 33. Re7+ Kf6 34. Rxh7 1-0

[Event "NED-ch17 sf"]
[Site "Amsterdam"]
[Date "1953.05.28"]
[Round "3"]
[White "Cortlever, Nicolaas"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "C02"]
[PlyCount "75"]
[EventDate "1953.05.26"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3 cxd4 7. cxd4 Nge7 8. b4 Nf5 9. Bb2 a5 10. b5 Be7 11. Qd2 Na7 12. Nc3 Bd7 13. Rb1 0-0 14. Bd3 g6 15. Na4 Qd8 16. Bc1 f6 17. 0-0 Be8 18. exf6 Bxf6 19. Nc5 Qb6 20. Bxf5 exf5 21. a4 Rc8 22. Ba3 Rf7 23. Rfe1 Bd7 24. Ne5 Bxe5 25. Rxe5 f4 26. Nxd7 Rxd7 27. Bc5 Qf6 28. Bxa7 b6 29. Bxb6 Qxb6 30. Qxf4 Rf7 31. Qe3 Rc4 32. Re8+ Kg7 33. Re7 Rxa4 34. Qe5+ Kg8 35. Qxd5 Qf6 36. Qxf7+ Qxf7 37. Rxf7 Kxf7 38. b6 1-0

[Event "NED-ch16 sf"]
[Site "Amsterdam"]
[Date "1951.08.16"]
[Round "4"]
[White "Vinken, Alex"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "A48"]
[PlyCount "77"]
[EventDate "1951.08.13"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Bf4 d6 4. Nbd2 Bg7 5. e3 0-0 6. Bd3 Nc6 7. c3 Qe8 8. Bg5 e5 9. 0-0 h6 10. Bxf6 Bxf6 11. h3 Bg7 12. d5 Ne7 13. e4 f5 14. Nh2 f4 15. Be2 h5 16. Ndf3 Bf6 17. Kh1 Kg7 18. Ng1 Rh8 19. c4 b6 20. b4 a5 21. a3 axb4 22. axb4 Rxa1 23. Qxa1 g5 24. f3 Ng8 25. Qa7 Qf7 26. Rc1 Nh6 27. c5 bxc5 28. bxc5 Bd7 29. cxd6 Rc8 30. Ba6 Bd8 31. Bxc8 Bxc8 32. dxc7 Bf6 33. Qa8 Qd7 34. Qc6 Qf7 35. Ra1 g4 36. Ra8 g3 37. Rxc8 gxh2 38. Qe8 hxg1Q+ 39. Kxg1 1-0

[Event "NED-chT 4041"]
[Site "Netherlands"]
[Date "1940.11.17"]
[Round "2.3"]
[White "Muller, WCAL"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "D30"]
[PlyCount "65"]
[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 "Amsterdam ASC"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 d5 2. c4 c6 3. e3 e6 4. Nf3 Nd7 5. Bd3 Ngf6 6. Qc2 Be7 7. 0-0 0-0 8. Nbd2 h6 9. b3 c5 10. Bb2 b6 11. e4 dxe4 12. Nxe4 Bb7 13. Rfd1 Qc7 14. dxc5 bxc5 15. Qe2 Rac8 16. Rd2 Qf4 17. Nxf6+ Bxf6 18. Ne1 Bd4 19. Rad1 e5 20. g3 Qg5 21. Be4 Bxe4 22. Qxe4 Nf6 23. Qg2 Qf5 24. Bxd4 cxd4 25. f4 Ng4 26. Nc2 Ne3 27. Nxe3 dxe3 28. Rd5 f6 29. Qf3 Qc2 30. Qxe3 exf4 31. gxf4 Qxa2 32. Rd7 Rf7 33. Qe6 1-0

[Event "NED Team-ch 1937/38"]
[Site "Netherlands"]
[Date "1938.03.06"]
[Round "5.9"]
[White "Karper, Jacob G"]
[Black "Goethart, Gerhard H"]
[Result "1/2-1/2"]
[ECO "A35"]
[PlyCount "110"]
[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 ASC"]
[BlackTeam "Den Haag DD"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. c4 c5 2. Nc3 Nc6 3. Nf3 g6 4. d4 cxd4 5. Nxd4 Bg7 6. e3 Qb6 7. Na4 Qa5+ 8. Bd2 Qd8 9. Bc3 Nf6 10. Qc2 d5 11. Rd1 Nxd4 12. Bxd4 Qc7 13. Qb3 dxc4 14. Bxc4 0-0 15. f4 Bd7 16. Nc5 Bc6 17. 0-0 b6 18. Be5 Qc8 19. Ne6 b5 20. Nxf8 bxc4 21. Qxc4 Bxf8 22. Rc1 Bb7 23. Qb3 Qd7 24. Rc7 Bd5 25. Rxd7 Bxb3 26. Bxf6 Be6 27. Rxe7 Bxe7 28. Bxe7 Bxa2 29. Bf6 Be6 30. Ra1 Kf8 31. Ra6 Ke8 32. Bd4 Rc8 33. Rxa7 Rc1+ 34. Kf2 Rc2+ 35. Kf3 Bd7 36. Bf6 Rc6 37. Ra8+ Bc8 38. g4 h5 39. gxh5 gxh5 40. e4 Kd7 41. Bc3 Kc7 42. f5 Rc4 43. f6 Kb6 44. Rb8+ Kc7 45. Rb4 Rc5 46. Kf4 h4 47. Ra4 h3 48. Ra1 Kb7 49. Re1 Be6 50. Re3 Rh5 51. Rg3 Rh4+ 52. Ke3 Kc6 53. Rg8 Rg4 54. Rxg4 Bxg4 55. Kd4 Be6 1/2-1/2

[Event "NED Team-ch 1937/38"]
[Site "Netherlands"]
[Date "1938.01.09"]
[Round "3.9"]
[White "Frank, Benjamin"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "D86"]
[PlyCount "99"]
[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 "Amsterdam ASC"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 c6 9. 0-0 b5 10. Bd3 Kh8 11. Be3 a6 12. Qd2 e6 13. f3 Nd7 14. Rf2 Qe7 15. Raf1 c5 16. Bh6 Rd8 17. h4 Bb7 18. h5 gxh5 19. Qf4 cxd4 20. cxd4 e5 21. Bxg7+ Kxg7 22. Qf5 h4 23. f4 Nc5 24. fxe5 Nxd3 25. Qxf7+ Qxf7 26. Rxf7+ Kg8 27. Rxb7 Re8 28. Rff7 Rac8 29. Rg7+ Kh8 30. Rxh7+ Kg8 31. Rbc7 Rxc7 32. Rxc7 Nxe5 33. dxe5 Rxe5 34. Nc3 b4 35. Nd5 Kf8 36. Nf6 Ra5 37. Rc2 Kf7 38. Nd5 Ra4 39. Re2 Ke6 40. Kh2 a5 41. Kh3 Ra3+ 42. Kxh4 b3 43. axb3 Rxb3 44. Ra2 Ke5 45. Ra4 Rb1 46. Kg5 Rb8 47. g4 Rg8+ 48. Kh4 Rh8+ 49. Kg3 Rh1 50. g5 1-0

[Event "NED Team-ch 1936/37"]
[Site "Netherlands"]
[Date "1937.01.10"]
[Round "3.4"]
[White "De Groot, Adriaan"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "B21"]
[PlyCount "51"]
[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 "Amsterdam ASC"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. c3 dxc3 5. Nxc3 d6 6. Bc4 e6 7. 0-0 a6 8. a4 Be7 9. Qe2 Nf6 10. Rd1 Qc7 11. Bf4 e5 12. Bg5 Na5 13. Ba2 Be6 14. Nd5 Bxd5 15. exd5 b6 16. b4 Nb7 17. Bc4 a5 18. Bb5+ Nd7 19. Bxe7 Kxe7 20. Rac1 Qb8 21. Nd4 Nd8 22. Nf5+ Ke8 23. Nxg7+ Kf8 24. Nh5 Ra7 25. Qg4 Rg8 26. Qf5 1-0

[Event "NED Team-ch 1936/37"]
[Site "Netherlands"]
[Date "1936.12.06"]
[Round "2.4"]
[White "Fischer, Jan"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "E68"]
[PlyCount "95"]
[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 "Amsterdam ASC"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 0-0 5. 0-0 d6 6. c4 Nbd7 7. Nc3 e5 8. e4 Re8 9. Re1 c6 10. Be3 h6 11. Qd2 Kh7 12. b4 Ng4 13. d5 Nxe3 14. Rxe3 c5 15. b5 Nf6 16. Qc2 Nh5 17. Ree1 Rf8 18. a4 b6 19. Nd2 Kh8 20. Ra3 f5 21. Kf1 f4 22. Ke2 fxg3 23. fxg3 Bg4+ 24. Bf3 Qd7 25. Nd1 Rf7 26. Nf2 Bxf3+ 27. Nxf3 Raf8 28. Rf1 g5 29. a5 g4 30. Nh4 Nf6 31. Ng6+ Kh7 32. Nxf8+ Rxf8 33. axb6 axb6 34. Rfa1 Qf7 35. Ra7 Nd7 36. Rf1 h5 37. Qd1 Qf3+ 38. Ke1 Qe3+ 39. Qe2 Qc1+ 40. Qd1 Qe3+ 41. Qe2 Qc1+ 42. Nd1 Nf6 43. Qe3 Qxc4 44. Rf5 Nxd5 45. Rxg7+ Kxg7 46. Qg5+ Kh7 47. Qxh5+ Kg7 48. Qxg4+ 1-0

[Event "NED Team-ch 1936/37"]
[Site "Netherlands"]
[Date "1936.11.15"]
[Round "1.4"]
[White "Hamming, Adolf Willem"]
[Black "Karper, Jacob G"]
[Result "1-0"]
[ECO "B12"]
[PlyCount "45"]
[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 "Den Haag DD"]
[BlackTeam "Amsterdam ASC"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 c6 2. d4 d5 3. f3 e6 4. Be3 dxe4 5. Nd2 Bd6 6. fxe4 Qh4+ 7. Bf2 Qd8 8. Ngf3 Ne7 9. Bd3 Ng6 10. e5 Bc7 11. 0-0 0-0 12. Ne4 b6 13. Bg3 Ba6 14. Bxa6 Nxa6 15. Nfg5 h6 16. Qh5 Qxd4+ 17. Kh1 Bxe5 18. Rad1 Qxb2 19. Nxf7 Rxf7 20. Qxg6 Bf6 21. c3 Raf8 22. Nxf6+ Rxf6 23. Rxf6 1-0

[Event "NED Team-ch 1934/35"]
[Site "Netherlands"]
[Date "1935.02.03"]
[Round "4.7"]
[White "Karper, Jacob G"]
[Black "Van der Gaag, C."]
[Result "1-0"]
[ECO "A52"]
[PlyCount "33"]
[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 "Amsterdam ASC"]
[BlackTeam "Utrecht"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 Nxe5 5. f4 Ng6 6. Nf3 Bb4+ 7. Nc3 d6 8. Bd3 Bxc3+ 9. bxc3 Qf6 10. e5 dxe5 11. fxe5 Nxe5 12. Qe2 Nbc6 13. 0-0 0-0 14. Ng5 Qd6 15. Bxh7+ Kh8 16. Qh5 Bg4 17. Qh4 1-0

