[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.22"]
[Round "9"]
[White "Van der Vegt, Seth"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "A10"]
[WhiteElo "1900"]
[BlackElo "1835"]
[PlyCount "71"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. c4 f5 2. g3 Nf6 3. Bg2 d6 4. Qb3 c6 5. d4 e5 6. d5 cxd5 7. cxd5 Be7 8. Nf3 0-0 9. 0-0 Nbd7 10. a4 Nc5 11. Qc4 Bd7 12. a5 Kh8 13. Rd1 Rc8 14. b4 Na6 15. Qb3 Qc7 16. Be3 Qc4 17. Qxc4 Rxc4 18. Bxa7 Nxb4 19. Na3 Rc3 20. Nxe5 dxe5 21. d6 Bd8 22. Bxb7 Ba4 23. Nb1 Rxg3+ 24. hxg3 Bxd1 25. Nc3 Bc2 26. Bc5 Rf7 27. a6 Nxa6 28. Bxa6 Nd7 29. Bc4 Rf8 30. Bb4 Nb6 31. Bb5 f4 32. Bc5 h5 33. Ra6 Nc8 34. Ra8 Bf5 35. d7 fxg3 36. Bxf8 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.21"]
[Round "8"]
[White "Abma, Klaas"]
[Black "Kazarjan, Gachatur"]
[Result "1-0"]
[ECO "C62"]
[WhiteElo "1835"]
[BlackElo "1746"]
[PlyCount "155"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 e5 2. dxe5 d6 3. e4 Nc6 4. Nf3 Bg4 5. Bb5 dxe5 6. Qxd8+ Rxd8 7. Bxc6+ bxc6 8. 0-0 f6 9. Be3 a6 10. a3 g5 11. Nc3 Bd6 12. Nd2 Be6 13. Rfd1 Ne7 14. Na4 Ng6 15. Nb3 h5 16. Nac5 Bc8 17. Na5 Ke7 18. Nxc6+ Kf7 19. Nxd8+ Rxd8 20. b4 h4 21. h3 g4 22. hxg4 Bxg4 23. f3 Bc8 24. Kf2 Rg8 25. Rh1 Ke7 26. Rag1 Rh8 27. g3 h3 28. Rh2 f5 29. exf5 Bxf5 30. c3 Ke8 31. Rgh1 e4 32. Nxe4 Rf8 33. Nxd6+ cxd6 34. Ke2 Ne5 35. f4 Bg4+ 36. Kf1 Nc4 37. Bc1 Rh8 38. Kf2 Kd7 39. Re1 d5 40. Kg1 Rg8 41. Rf2 Bf5 42. Kh2 Kc6 43. a4 Nd6 44. Re5 Rf8 45. Rfe2 Ne4 46. Bb2 Bg4 47. R2xe4 dxe4 48. Rxe4 Rd8 49. Rd4 Re8 50. Rd2 Bf3 51. Rf2 Bg2 52. g4 Kd5 53. g5 Rg8 54. Re2 Kc4 55. Ba1 Kb3 56. b5 axb5 57. axb5 Kc4 58. Bb2 Kxb5 59. Ba3 Kc4 60. Bb4 Rg7 61. Rf2 Kd3 62. Rxg2 hxg2 63. Kxg2 Ke4 64. Kg3 Kf5 65. Bd6 Rd7 66. Be5 Rd3+ 67. Kf2 Rd8 68. Ke3 Rd7 69. c4 Ke6 70. Ke4 Rd1 71. f5+ Kf7 72. c5 Re1+ 73. Kd5 Rf1 74. g6+ Ke8 75. f6 Rf5 76. Ke6 Rf2 77. g7 Rxf6+ 78. Kxf6 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.20"]
[Round "7"]
[White "Huo, Da"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "1909"]
[BlackElo "1835"]
[PlyCount "93"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. d4 c5 6. Bc4+ Be6 7. Bxe6+ Kxe6 8. 0-0 cxd4 9. c3 Qd7 10. cxd4 Kf7 11. Qb3+ Ke8 12. e5 dxe5 13. dxe5 Ne4 14. Re1 Nc5 15. e6 Nxb3 16. exd7+ Kxd7 17. axb3 Nc6 18. Be3 Bb4 19. Nc3 Rhd8 20. h3 b6 21. Ra4 Kc7 22. Rc1 Kb7 23. Ne4 a5 24. Raa1 Rac8 25. Ng5 Rd3 26. Ne6 g6 27. Rc2 Rxb3 28. Rac1 Rd3 29. Kf1 Ne7 30. Rxc8 Nxc8 31. Ke2 Rd7 32. Kf3 Ne7 33. Nf8 Rc7 34. Rxc7+ Kxc7 35. Nxh7 Nd5 36. Bd4 Be7 37. Ke4 Kc6 38. f4 b5 39. g4 a4 40. f5 gxf5+ 41. gxf5 Nb6 42. f6 Bd6 43. Bxb6 Kxb6 44. f7 Kc5 45. Kd3 b4 46. Kc2 a3 47. b3 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.19"]
[Round "6"]
[White "Abma, Klaas"]
[Black "Tabak, Wesley"]
[Result "1/2-1/2"]
[ECO "E06"]
[WhiteElo "1835"]
[BlackElo "1506"]
[PlyCount "156"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. g3 c6 4. Bg2 e6 5. 0-0 Be7 6. b3 0-0 7. c4 dxc4 8. bxc4 c5 9. e3 Nc6 10. Nc3 cxd4 11. exd4 Rb8 12. Bf4 Bd6 13. Bg5 Be7 14. Rc1 h6 15. Be3 b6 16. Qa4 Na5 17. Ne5 Bb7 18. Bxb7 Rxb7 19. Rfd1 Nd7 20. Nf3 Nf6 21. d5 exd5 22. cxd5 Rc7 23. Ne4 Nxe4 24. Qxe4 Rxc1 25. Bxc1 Nb7 26. Ne5 Nc5 27. Qg4 Qc8 28. Qxc8 Rxc8 29. Nc6 Bf6 30. Nxa7 Ra8 31. Nb5 Nd7 32. a3 Ra5 33. Nd6 Be5 34. Nc4 Rc5 35. Nxe5 Nxe5 36. Be3 Ra5 37. Bxb6 Rxa3 38. Kg2 Nd7 39. Be3 f6 40. h3 Ra5 41. Kf3 Kf7 42. Ke4 Ra4+ 43. Rd4 Rxd4+ 44. Bxd4 g6 45. Bc3 Ke8 46. Bd2 h5 47. h4 Kf7 48. Bc3 Ke7 49. Bb4+ Kf7 50. Kd4 Ke8 51. Kc4 Ne5+ 52. Kd4 Nd7 53. Ke4 Kf7 54. f3 Ne5 55. Bc3 Nd7 56. g4 hxg4 57. fxg4 Nc5+ 58. Kf4 Nd7 59. h5 gxh5 60. gxh5 Kg7 61. Kf5 Kh6 62. Bxf6 Kxh5 63. Ke6 Nc5+ 64. Kd6 Ne4+ 65. Ke5 Kg6 66. Bh4 Nc5 67. d6 Kf7 68. Kd5 Nd7 69. Bg5 Ke8 70. Kc6 Nb8+ 71. Kc7 Nd7 72. Be3 Ne5 73. Bd4 Nf7 74. d7+ Ke7 75. Bc5+ Ke6 76. Kc8 Kd5 77. Bf8 Kc6 78. d8N+ Nxd8 1/2-1/2

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.18"]
[Round "4"]
[White "Boeren, Jurriaan"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "C43"]
[WhiteElo "1987"]
[BlackElo "1835"]
[PlyCount "59"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. dxe5 d5 5. Nbd2 Nxd2 6. Bxd2 Be7 7. Bd3 c5 8. c3 Nc6 9. 0-0 Bg4 10. Re1 Qd7 11. h3 Bf5 12. e6 fxe6 13. Bxf5 exf5 14. Ng5 0-0-0 15. Nf7 g5 16. Nxd8 Nxd8 17. Qh5 h6 18. Re2 g4 19. hxg4 fxg4 20. Bf4 Nc6 21. Rd1 d4 22. Be5 Rf8 23. cxd4 cxd4 24. Bg7 Rf5 25. Qxg4 h5 26. Qe4 Rg5 27. Bh6 Re5 28. Qc2 Rc5 29. Qh7 Qg4 30. Rde1 1-0

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.17"]
[Round "3"]
[White "Abma, Klaas"]
[Black "Clemens, Adrian HP"]
[Result "0-1"]
[ECO "A49"]
[WhiteElo "1835"]
[BlackElo "2082"]
[PlyCount "88"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 0-0 5. 0-0 d6 6. b3 c5 7. Bb2 cxd4 8. Nxd4 d5 9. c4 dxc4 10. Nd2 cxb3 11. Qxb3 Nc6 12. Nxc6 bxc6 13. Bxc6 Be6 14. Qf3 Rc8 15. Nb3 Bg4 16. Qg2 Bxe2 17. Rfe1 Bg4 18. Nd4 Qb6 19. Rab1 e5 20. Rxe5 Nh5 21. Rb5 Qa6 22. Bb7 Qxa2 23. Ra1 Qxa1+ 24. Bxa1 Rc1+ 25. Qf1 Rxf1+ 26. Kxf1 Rd8 27. Rd5 Rxd5 28. Bxd5 Nf6 29. Bc6 Bd7 30. Bb7 Ne8 31. Ke2 Nd6 32. Bd5 Nb5 33. Kd3 Kf8 34. Kc4 Bxd4 35. Bxd4 Nxd4 36. Kxd4 g5 37. h4 gxh4 38. gxh4 Ke7 39. Ke5 a5 40. f4 f6+ 41. Kd4 Kd6 42. Bg8 h6 43. Ba2 Be6 44. Bb1 a4 0-1

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.16"]
[Round "2"]
[White "Bellamy, Linda"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "C42"]
[WhiteElo "1401"]
[BlackElo "1835"]
[PlyCount "120"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. 0-0 0-0 8. c4 c6 9. c5 Bc7 10. Nbd2 f5 11. Ne5 Bxe5 12. dxe5 Qe7 13. b4 Nd7 14. f4 a5 15. Qb3 axb4 16. Nxe4 fxe4 17. Bxe4 Nxc5 18. Bxd5+ cxd5 19. Qxd5+ Be6 20. Qf3 Rxa2 21. Rxa2 Bxa2 22. Bb2 Be6 23. g4 Bd7 24. f5 Bc6 25. f6 Qd7 26. e6 Qxe6 27. Qf5 Qxf5 28. gxf5 gxf6 29. Bd4 Ne4 30. Rb1 b3 31. Rxb3 Kf7 32. Rh3 Rg8+ 33. Kf1 Kg7 34. Rh4 h6 35. Rg4+ Kh7 36. Rf4 Rd8 37. Be3 Nd2+ 38. Kf2 Ne4+ 39. Ke1 Ra8 40. Rh4 Ng5 41. Rf4 Ra1+ 42. Ke2 Ra2+ 43. Kd3 Be4+ 44. Kd4 Rxh2 45. Rf1 Ra2 46. Bxg5 Ra4+ 47. Kc5 hxg5 48. Kd6 Kg7 49. Ke7 Ra5 50. Re1 Re5+ 51. Kd6 Bxf5 52. Rc1 b5 53. Rc7+ Kg6 54. Rb7 Be4 55. Rb8 Kf5 56. Rg8 Bd3 57. Kc7 b4 58. Rb8 Rb5 59. Rd8 b3 60. Rxd3 b2 0-1

[Event "Hoogeveen op 25th"]
[Site "Hoogeveen"]
[Date "2022.10.15"]
[Round "1"]
[White "Abma, Klaas"]
[Black "Janse, Jan Jaap"]
[Result "0-1"]
[ECO "D02"]
[WhiteElo "1835"]
[BlackElo "2159"]
[PlyCount "66"]
[EventDate "2022.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 210 Extra"]
[Source "ChessBase"]
[SourceDate "2022.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.11.30"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Bf5 3. Bf4 c5 4. c4 e6 5. Bxb8 Rxb8 6. Qa4+ b5 7. cxb5 Qb6 8. e3 Bxb1 9. Rxb1 c4 10. Be2 Qxb5 11. Qxb5+ Rxb5 12. 0-0 Ra5 13. a3 Nf6 14. b3 cxb3 15. Rxb3 Bd6 16. Bb5+ Ke7 17. Ne5 Bxe5 18. dxe5 Ng4 19. f4 Rb8 20. a4 a6 21. Bc4 Rxb3 22. Bxb3 Rc5 23. e4 dxe4 24. Re1 f5 25. exf6+ Nxf6 26. h3 Rc3 27. Bd1 Nd5 28. Be2 a5 29. Bg4 Rc4 30. Rb1 Rxa4 31. Rb7+ Kf6 32. Bh5 Nxf4 33. Rf7+ Ke5 0-1

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.13"]
[Round "7"]
[White "Clemens, Adrian HP"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "2179"]
[BlackElo "1909"]
[PlyCount "73"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 a5 8. Qd3 Nc6 9. e4 e5 10. dxe5 dxe5 11. Qxd8 Rxd8 12. Nh4 fxe4 13. Nxe4 Nxe4 14. Bxe4 Nd4 15. Nf3 Nxf3+ 16. Bxf3 c6 17. Be3 Be6 18. b3 a4 19. Be4 axb3 20. axb3 Bh3 21. Rfc1 Be6 22. Kf1 g6 23. Ke2 Bg4+ 24. f3 Bf5 25. Bb6 Rdc8 26. Rd1 Be6 27. Ba5 Bf5 28. Bc3 Bxe4 29. fxe4 Bf6 30. h4 Rd8 31. Rxa8 Rxa8 32. Rd7 Ra2+ 33. Kd3 Rg2 34. Be1 Rb2 35. Rxb7 g5 36. hxg5 Bxg5 37. Bc3 1-0

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.10"]
[Round "1"]
[White "Abma, Klaas"]
[Black "De Boer, Bas"]
[Result "0-1"]
[ECO "B13"]
[WhiteElo "1909"]
[BlackElo "2164"]
[PlyCount "80"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. d4 d5 2. Bf4 c5 3. e3 cxd4 4. exd4 Nc6 5. c3 Bf5 6. Nf3 e6 7. Qb3 Qd7 8. Bb5 Nge7 9. Ne5 Qc8 10. Nd2 f6 11. Nef3 Ng6 12. Bg3 a6 13. Be2 Qd7 14. 0-0 Bd6 15. c4 Bxg3 16. hxg3 0-0 17. Rfe1 Rac8 18. cxd5 exd5 19. Rac1 Rfe8 20. Nf1 Be4 21. N1d2 Kh8 22. a3 f5 23. Kf1 f4 24. Nxe4 dxe4 25. Ng5 h6 26. Nf7+ Kh7 27. Bh5 Nxd4 28. Qb6 Nc6 29. Qb3 Rc7 30. Ng5+ hxg5 31. Bxg6+ Kxg6 32. gxf4 gxf4 33. Rcd1 Qe6 34. Qc3 Rd7 35. Rc1 Qd5 36. Kg1 Qd3 37. Qc5 Re5 38. Qf8 Rf7 39. Qc8 Qd7 40. Qg8 Re8 0-1

[Event "Groningen op-B 55th"]
[Site "Groningen"]
[Date "2017.12.29"]
[Round "8"]
[White "Pompstra, Henk"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "A40"]
[WhiteElo "1772"]
[BlackElo "1945"]
[PlyCount "66"]
[EventDate "2017.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. Bf4 f5 3. e4 fxe4 4. Qh5+ g6 5. Qe5 Nf6 6. Qxc7 Qxc7 7. Bxc7 Nc6 8. Bg3 Bg7 9. c3 0-0 10. Na3 d5 11. Nb5 Ne8 12. h4 a6 13. Nd6 Nxd6 14. Bxd6 Rf7 15. h5 e5 16. hxg6 hxg6 17. dxe5 Nxe5 18. 0-0-0 Be6 19. f4 Rxf4 20. Nh3 Rf5 21. Be2 Rd8 22. Bxe5 Bxe5 23. Bg4 Rf6 24. Bxe6+ Rxe6 25. Kd2 Rb6 26. b3 Rc6 27. c4 dxc4+ 28. Ke3 Rxd1 29. Rxd1 c3 30. Rc1 c2 31. Kd2 e3+ 32. Kd3 e2 33. Kd2 Bb2 0-1

[Event "Groningen op-B 55th"]
[Site "Groningen"]
[Date "2017.12.28"]
[Round "7"]
[White "Dekker, Jasper"]
[Black "Abma, Klaas"]
[Result "1/2-1/2"]
[ECO "C05"]
[WhiteElo "1700"]
[BlackElo "1945"]
[PlyCount "33"]
[EventDate "2017.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4 c5 6. Ngf3 Nc6 7. Nb3 cxd4 8. Nfxd4 Nc5 9. c3 Qb6 10. Be3 Nxb3 11. Qxb3 Bc5 12. Qxb6 Bxb6 13. Bb5 Bd7 14. Nc2 Bxe3 15. Bxc6 Bxf4 16. Bxd7+ Kxd7 17. 0-0 1/2-1/2

[Event "Groningen op-B 55th"]
[Site "Groningen"]
[Date "2017.12.27"]
[Round "6"]
[White "Abma, Klaas"]
[Black "Molanus, Lennart"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "1945"]
[BlackElo "1603"]
[PlyCount "31"]
[EventDate "2017.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. Bf4 Bf5 4. e3 e6 5. Ne5 c5 6. g4 Qa5+ 7. Nd2 g5 8. Bxg5 Ne4 9. gxf5 Nxg5 10. fxe6 Nxe6 11. Qh5 Qc7 12. Bh3 Ng7 13. Qf3 Bd6 14. Qxd5 f6 15. Ndc4 fxe5 16. Nxd6+ 1-0

[Event "Groningen op-B 55th"]
[Site "Groningen"]
[Date "2017.12.24"]
[Round "4"]
[White "Vandeputte, Samuel"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "1576"]
[BlackElo "1945"]
[PlyCount "65"]
[EventDate "2017.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. c4 f5 2. Nc3 Nf6 3. g3 e6 4. Bg2 Be7 5. d4 0-0 6. Nf3 d6 7. 0-0 a5 8. b3 Ne4 9. Bb2 Nxc3 10. Bxc3 Bf6 11. Qc2 Nc6 12. e4 fxe4 13. Qxe4 d5 14. Qe2 Ne7 15. Ne5 Bxe5 16. dxe5 d4 17. Rad1 c5 18. Qd3 Qc7 19. Bd2 Qxe5 20. Bf4 Rxf4 21. gxf4 Qxf4 22. Rfe1 Qc7 23. Bh3 e5 24. f4 Bxh3 25. Qxh3 Nc6 26. Qe6+ Kh8 27. fxe5 d3 28. Qd6 Qxd6 29. exd6 h6 30. d7 Kh7 31. Re8 Rd8 32. Rxd8 Nxd8 33. Kf2 1-0

[Event "Groningen op-B 55th"]
[Site "Groningen"]
[Date "2017.12.23"]
[Round "3"]
[White "Van Walraven, Arie"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "C19"]
[WhiteElo "1613"]
[BlackElo "1945"]
[PlyCount "76"]
[EventDate "2017.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Ne7 5. a3 Bxc3+ 6. bxc3 c5 7. Nf3 Nbc6 8. Bd3 c4 9. Be2 Qa5 10. Qd2 Qa4 11. 0-0 Bd7 12. Ne1 0-0-0 13. f4 f5 14. h4 Rdg8 15. Kf2 h6 16. Nf3 Be8 17. Bb2 Nd8 18. Rh1 Bh5 19. Rag1 g6 20. Ne1 Bxe2 21. Kxe2 Rh7 22. Rh2 Rhg7 23. Nf3 Nf7 24. Kd1 g5 25. hxg5 hxg5 26. fxg5 Nxg5 27. Nxg5 Rxg5 28. Rh8 Qe8 29. Qxg5 Rxh8 30. Qf6 Kd7 31. Qg5 Rg8 32. Qh6 Qg6 33. Bc1 Qg4+ 34. Kd2 Qe4 35. Qh3 f4 36. Kd1 Rg3 37. Qh2 Rxc3 38. Qxf4 Qxc2+ 0-1

[Event "NED-chT 1112"]
[Site "Netherlands"]
[Date "2012.04.22"]
[Round "9.10"]
[White "Heman, Frans"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "1600"]
[BlackElo "1969"]
[PlyCount "122"]
[EventDate "2011.09.17"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]
[WhiteTeam "Voerendaal"]
[BlackTeam "Groningen"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. f4 d5 2. Nf3 Nf6 3. e3 g6 4. b3 Bg7 5. Bb2 0-0 6. Bd3 c5 7. 0-0 Nc6 8. Bb5 Qc7 9. Bxc6 Qxc6 10. Ne5 Qc7 11. d3 Ng4 12. Qf3 Nxe5 13. fxe5 Bxe5 14. Bxe5 Qxe5 15. Nd2 Qc3 16. Qd1 Be6 17. Rc1 Rad8 18. Qe1 Bg4 19. Nb1 Qxe1 20. Rcxe1 e5 21. Nd2 Kg7 22. h3 Be6 23. Rf2 f6 24. h4 h6 25. g3 Bg4 26. Kg2 b6 27. Rc1 Be6 28. Re1 d4 29. e4 Bg4 30. Rc1 Bd7 31. Rcf1 Bc6 32. Rc1 Bb7 33. Kg1 Ba6 34. Kg2 Rf7 35. Rcf1 Rdf8 36. Kg1 Rd8 37. Nf3 Rdf8 38. Kg2 Bc8 39. Nd2 Be6 40. Nf3 Bg4 41. Nd2 b5 42. Nb1 f5 43. Nd2 Rf6 44. Kh2 f4 45. gxf4 Rxf4 46. Kg3 Rxf2 47. Rxf2 Rxf2 48. Kxf2 Bd1 49. Nf3 Bxf3 50. Kxf3 Kf6 51. Kg4 h5+ 52. Kf3 g5 53. hxg5+ Kxg5 54. Kg3 b4 55. Kh3 h4 56. Kg2 Kg4 57. Kh2 h3 58. Kg1 Kg3 59. Kh1 h2 60. c3 dxc3 61. d4 c2 0-1

[Event "NED-chT 1112"]
[Site "Netherlands"]
[Date "2011.11.26"]
[Round "3.9"]
[White "Klip, Hans"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "C17"]
[WhiteElo "2381"]
[BlackElo "1990"]
[PlyCount "57"]
[EventDate "2011.09.17"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]
[WhiteTeam "Utrecht"]
[BlackTeam "Groningen"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Nf3 Nc6 6. dxc5 Bxc5 7. Bd3 a6 8. 0-0 Bd7 9. a3 Nge7 10. Bf4 Ng6 11. Bg3 Be7 12. Re1 Nh4 13. Nxh4 Bxh4 14. Qh5 Bxg3 15. hxg3 g6 16. Qf3 h5 17. Rad1 Qe7 18. b4 0-0 19. g4 hxg4 20. Qxg4 Kg7 21. g3 f5 22. exf6+ Qxf6 23. f4 Ne7 24. Re5 Rh8 25. Rde1 Nc6 26. Nxd5 Nxe5 27. fxe5 Qf7 28. Rf1 Qe8 29. Nc7 1-0

[Event "Utrecht OKU op 38th"]
[Site "Utrecht"]
[Date "2011.06.04"]
[Round "4"]
[White "Abma, Klaas"]
[Black "Boulahfa, Hicham"]
[Result "1/2-1/2"]
[ECO "E14"]
[WhiteElo "1990"]
[BlackElo "2079"]
[PlyCount "56"]
[EventDate "2011.06.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 Nf6 3. e3 c5 4. Bd3 Nc6 5. 0-0 Be7 6. b3 b6 7. Bb2 Bb7 8. Nbd2 0-0 9. c4 d5 10. cxd5 Nxd5 11. Rc1 Bf6 12. Ne4 cxd4 13. Nxf6+ Qxf6 14. Nxd4 Nxd4 15. Bxd4 e5 16. Qh5 g6 17. Qxe5 Qxe5 18. Bxe5 Nb4 19. Bb1 Ba6 20. Rfd1 Rfd8 21. Bf6 Rdc8 22. Rxc8+ Rxc8 23. f3 Bb5 24. a3 Na6 25. Rd8+ Rxd8 26. Bxd8 Nc5 27. b4 Ne6 28. Bf6 Bc4 1/2-1/2

[Event "Utrecht OKU op 38th"]
[Site "Utrecht"]
[Date "2011.06.04"]
[Round "3"]
[White "Bekker, Stefan"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2162"]
[BlackElo "1990"]
[PlyCount "79"]
[EventDate "2011.06.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 f6 9. exf6 Nxf6 10. Nf3 Bd6 11. 0-0 Qc7 12. Bg5 0-0 13. Bh4 Nh5 14. Bg3 Nxg3 15. hxg3 Qe7 16. Nc3 Bd7 17. Re1 Qf6 18. Re2 Rae8 19. Bb5 Qf5 20. Qd2 Re7 21. Rae1 Rf6 22. Bxc6 bxc6 23. Na4 Rh6 24. Qg5 Qxg5 25. Nxg5 Rg6 26. Nf3 Rf6 27. Ne5 Rf8 28. Rc1 Bxe5 29. Rxe5 Rf5 30. Re3 Ref7 31. Rc2 R7f6 32. Nc5 Bc8 33. Nd3 Ba6 34. Ne5 Bb5 35. Nd7 Rh6 36. Rf3 Rxf3 37. gxf3 Kf7 38. Ne5+ Ke7 39. b3 Rf6 40. a4 1-0

[Event "Utrecht OKU op 38th"]
[Site "Utrecht"]
[Date "2011.06.03"]
[Round "1"]
[White "Abma, Klaas"]
[Black "Sekandar, Kambiz"]
[Result "1-0"]
[ECO "D05"]
[WhiteElo "1990"]
[BlackElo "1926"]
[PlyCount "33"]
[EventDate "2011.06.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. e3 b6 4. Bd3 Bb7 5. 0-0 d5 6. b3 Bd6 7. Bb2 0-0 8. Nbd2 Nbd7 9. Ne5 c5 10. f4 Ne4 11. Rf3 f6 12. Nxd7 Qxd7 13. Rh3 cxd4 14. Bxd4 e5 15. Nxe4 dxe4 16. Bc4+ Kh8 17. Rxh7+ 1-0

[Event "NED-chT 1011"]
[Site "Netherlands"]
[Date "2010.12.11"]
[Round "4.9"]
[White "Abma, Klaas"]
[Black "Besseling, Michiel"]
[Result "1/2-1/2"]
[ECO "D04"]
[WhiteElo "1990"]
[BlackElo "2226"]
[PlyCount "81"]
[EventDate "2010.09.25"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]
[WhiteTeam "Groningen"]
[BlackTeam "Rotterdam"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 4. Nbd2 e6 5. Ne5 Nfd7 6. g4 Bg6 7. Nxg6 hxg6 8. Nf3 Bd6 9. c4 dxc4 10. Bxc4 Nb6 11. Bb3 N8d7 12. e4 0-0 13. Bg5 Bb4+ 14. Kf1 Be7 15. Bf4 c5 16. d5 exd5 17. exd5 c4 18. Bc2 Re8 19. g5 Nc5 20. d6 Bf8 21. h4 Ne4 22. h5 Bxd6 23. Bxd6 Qxd6 24. Qxd6 Nxd6 25. hxg6 fxg6 26. Bxg6 Re6 27. Bc2 Rf8 28. Nd4 Re5 29. Re1 Rxe1+ 30. Kxe1 Nd5 31. a3 Nf4 32. Rh2 Re8+ 33. Kd2 Ne4+ 34. Bxe4 Rxe4 35. Kc3 Ne6 36. Nxe6 Rxe6 37. Kxc4 Kf7 38. f3 Kg6 39. Rg2 Kf5 40. Rd2 Rc6+ 41. Kd5 1/2-1/2

[Event "Remco Heite rap op 3rd"]
[Site "Wolvega"]
[Date "2010.11.27"]
[Round "1"]
[White "Brandenburg, Daan"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2515"]
[BlackElo "1990"]
[PlyCount "60"]
[EventDate "2010.11.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 139 Extra"]
[Source "ChessBase"]
[SourceDate "2011.01.05"]
[SourceVersion "1"]
[SourceVersionDate "2011.01.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. c3 c5 6. Bd3 Nc6 7. Ne2 cxd4 8. cxd4 f6 9. exf6 Nxf6 10. 0-0 Bd6 11. Nf3 Qc7 12. Bg5 0-0 13. Rc1 h6 14. Bd2 Bd7 15. Ng3 Rae8 16. Bc3 Qb8 17. Nh4 Ne7 18. Re1 g5 19. Nf3 Nf5 20. Ne5 Nh4 21. Nh5 Qd8 22. Qe2 a6 23. f4 Nxh5 24. Qxh5 Bxe5 25. fxe5 Nf5 26. Qg6+ Kh8 27. Bxf5 Rxf5 28. Qxh6+ Kg8 29. Qg6+ Kf8 30. Bb4+ Re7 1-0

[Event "Apeldoorn Homburg op"]
[Site "Apeldoorn"]
[Date "2010.09.10"]
[Round "1"]
[White "Abma, Klaas"]
[Black "Kabatianski, Alexander"]
[Result "0-1"]
[ECO "D05"]
[WhiteElo "1922"]
[BlackElo "2423"]
[PlyCount "63"]
[EventDate "2010.09.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 138 Extra"]
[Source "ChessBase"]
[SourceDate "2010.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2010.10.29"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. e3 b6 4. Bd3 Bb7 5. 0-0 d5 6. Ne5 Bd6 7. b3 0-0 8. Bb2 c5 9. Nd2 Nc6 10. a3 Ne7 11. f4 Qc7 12. Qe2 Rad8 13. Rae1 Ne4 14. Nxe4 dxe4 15. Bc4 cxd4 16. exd4 Nf5 17. b4 Kh8 18. Bb3 Rfe8 19. Ba4 Rf8 20. Bb3 Rfe8 21. Ba4 Re7 22. c4 Bxe5 23. dxe5 Rd3 24. Bc2 Re3 25. Qf2 Rxe1 26. Rxe1 Qxc4 27. Rd1 h5 28. Rd8+ Kh7 29. Bd1 g6 30. h3 e3 31. Qe1 Qxf4 32. Bc2 0-1

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.07.04"]
[Round "9"]
[White "Abma, Klaas"]
[Black "Van Brussel, Bert"]
[Result "1/2-1/2"]
[ECO "B08"]
[WhiteElo "1981"]
[BlackElo "1887"]
[PlyCount "53"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d6 3. Nc3 g6 4. e4 Bg7 5. Be3 c6 6. Qd2 b5 7. Bd3 Bb7 8. a3 0-0 9. Rd1 a6 10. h4 Ng4 11. Bg5 h6 12. Bf4 e5 13. dxe5 dxe5 14. Bg3 Qe7 15. h5 g5 16. Nh2 Nxh2 17. Bxh2 Rd8 18. 0-0 Nd7 19. Qe3 Nf8 20. Ne2 c5 21. Ng3 Bc8 22. Kh1 Be6 23. f3 Rac8 24. Bg1 c4 25. Be2 Nh7 26. Bf2 Bf8 27. Rxd8 1/2-1/2

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.07.03"]
[Round "8"]
[White "Bonoo, Iwan"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "1949"]
[BlackElo "1981"]
[PlyCount "112"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 f5 3. g3 Nf6 4. Bg2 Be7 5. c4 0-0 6. Nc3 d6 7. 0-0 a5 8. Ne1 Nbd7 9. e4 fxe4 10. Nxe4 Nxe4 11. Bxe4 d5 12. cxd5 Nf6 13. d6 Nxe4 14. dxe7 Qxe7 15. Qe2 Nf6 16. Bf4 b6 17. Nd3 Ba6 18. Rfe1 Nd5 19. Qe4 Bxd3 20. Qxd5 Rae8 21. Qc6 g5 22. Be5 Qf7 23. f4 Re7 24. Rac1 g4 25. Qb7 c5 26. Qxb6 Rb7 27. Qxc5 Rxb2 28. Qc3 Qb7 29. Qc6 Qxc6 30. Rxc6 Rxa2 31. Rxe6 Rc8 32. Bd6 Bg6 33. Bc5 Rb8 34. Rb6 Rxb6 35. Bxb6 a4 36. Bc5 Rb2 37. d5 Rb1 38. Rxb1 Bxb1 39. Kf2 Bf5 40. Ke3 Kf7 41. Kd4 Bd7 42. Ke5 Bc8 43. f5 h5 44. Kf4 Kf6 45. Bd4+ Kf7 46. Kg5 a3 47. f6 a2 48. Kxh5 Bd7 49. Kg5 Bc8 50. Kf4 Bd7 51. Ke5 Bc8 52. Kd6 Bb7 53. Bb2 Kf8 54. Kc5 Kf7 55. d6 Ke6 56. Kb6 Bc8 1-0

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.07.02"]
[Round "7"]
[White "Abma, Klaas"]
[Black "Van den Bergh, Ben G"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "1981"]
[BlackElo "2008"]
[PlyCount "99"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Nc3 Bg7 4. e4 d6 5. Be3 0-0 6. Qd2 Bg4 7. Be2 c6 8. h3 Bxf3 9. Bxf3 Nbd7 10. g4 e5 11. dxe5 Nxe5 12. Be2 d5 13. f4 Nc4 14. Bxc4 dxc4 15. Qxd8 Rfxd8 16. Ke2 b6 17. Rad1 h6 18. Rxd8+ Rxd8 19. Rd1 Rxd1 20. Kxd1 Nd7 21. Ke2 Bxc3 22. bxc3 f6 23. h4 g5 24. h5 Kf7 25. Kf3 Ke6 26. Kg3 a5 27. Kf3 b5 28. Ke2 c5 29. Kd2 Kf7 30. Ke2 Kg7 31. Kf3 a4 32. a3 Kf7 33. Ke2 Ke6 34. Kf3 gxf4 35. Kxf4 b4 36. cxb4 cxb4 37. axb4 a3 38. Bd4 a2 39. b5 Nb6 40. Ke3 Na4 41. Ba1 c3 42. Kd4 Kd6 43. Kc4 Ke5 44. Kb4 Nb6 45. Kxc3 Kxe4 46. Kb3 Kf4 47. c4 f5 48. gxf5 Kxf5 49. Bd4 Ke4 50. Ba1 1-0

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.07.01"]
[Round "6"]
[White "Abma, Klaas"]
[Black "De Groot, Rene"]
[Result "1-0"]
[ECO "A43"]
[WhiteElo "1981"]
[BlackElo "1814"]
[PlyCount "91"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 c5 3. d5 d6 4. Nc3 Nbd7 5. g3 e6 6. Bg2 exd5 7. Nxd5 Nxd5 8. Qxd5 Nf6 9. Qd3 Bd7 10. 0-0 Be7 11. Bg5 Bc6 12. Rad1 Qd7 13. Rfe1 h6 14. Bc1 0-0 15. e4 Rfe8 16. c4 Rad8 17. Nh4 Bf8 18. f3 b5 19. b3 bxc4 20. bxc4 Ba4 21. Rd2 d5 22. cxd5 Nxd5 23. Qf1 Qe7 24. Nf5 Qe6 25. Bh3 Kh8 26. Nxg7 Qb6 27. Nxe8 c4+ 28. Kh1 Ne3 29. Rxe3 Rxd2 30. Bxd2 Bc5 31. Bc3+ Kg8 32. Nf6+ Kf8 33. Re2 Bd4 34. Bxd4 Qxd4 35. Nd5 c3 36. Nxc3 Qxc3 37. Qf2 Bd1 38. Re3 Qc1 39. Kg2 Qb1 40. Qd2 Ba4 41. Qd8+ Be8 42. Rd3 Qxa2+ 43. Rd2 Qb3 44. Bd7 Qc3 45. Bxe8 Kg7 46. Qd4+ 1-0

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.06.30"]
[Round "5"]
[White "Wieringa, Helmer"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "2083"]
[BlackElo "1981"]
[PlyCount "59"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 Qa5 8. Qd2 a6 9. dxc5 Nxc5 10. Be2 b5 11. 0-0 b4 12. Nd1 Ne4 13. Qe1 Bc5 14. Bd3 Bxe3+ 15. Nxe3 Nc5 16. Kh1 Qb6 17. f5 Nxd3 18. cxd3 Bd7 19. Rc1 Rc8 20. Nxd5 Qb5 21. Nf4 g5 22. Nh5 g4 23. Nf6+ Ke7 24. Nxg4 exf5 25. Qh4+ Kf8 26. Qh6+ Ke8 27. Nf6+ Kd8 28. Nxd7 Kxd7 29. Qd6+ Ke8 30. e6 1-0

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.06.29"]
[Round "4"]
[White "Abma, Klaas"]
[Black "Kampman, Tijmen"]
[Result "0-1"]
[ECO "D05"]
[WhiteElo "1981"]
[BlackElo "2058"]
[PlyCount "80"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 Nf6 3. e3 b6 4. Bd3 Bb7 5. 0-0 d5 6. Ne5 c5 7. b3 Nc6 8. Bb2 Nxe5 9. dxe5 Nd7 10. f4 g6 11. Nd2 Bg7 12. Qg4 Qe7 13. e4 0-0 14. Rae1 c4 15. bxc4 dxe4 16. Nxe4 Bxe4 17. Rxe4 Rfd8 18. Qe2 Qb4 19. Bd4 Nc5 20. c3 Qa3 21. Re3 Nxd3 22. Rxd3 Rac8 23. Rh3 Qa4 24. g4 Qxc4 25. Qf2 h6 26. f5 g5 27. f6 Bf8 28. Rf3 Bc5 29. Bxc5 Rxc5 30. Rh3 Qxg4+ 31. Rg3 Qh4 32. Qg2 Qh5 33. Qb7 Rxe5 34. Qxa7 Re2 35. Rg2 Rxg2+ 36. Kxg2 Qe2+ 37. Rf2 Qe4+ 38. Kg1 Rd1+ 39. Rf1 Qg4+ 40. Kf2 Qf4+ 0-1

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.06.28"]
[Round "3"]
[White "Burton, Graham P"]
[Black "Abma, Klaas"]
[Result "1/2-1/2"]
[ECO "C02"]
[WhiteElo "2083"]
[BlackElo "1981"]
[PlyCount "34"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7 6. Be2 Nh6 7. 0-0 cxd4 8. cxd4 Nf5 9. Nc3 Be7 10. g4 Nh4 11. Nxh4 Bxh4 12. Be3 f6 13. f4 0-0 14. exf6 Bxf6 15. Qd2 g6 16. Rac1 Rc8 17. Bf3 Kh8 1/2-1/2

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.06.27"]
[Round "2"]
[White "Abma, Klaas"]
[Black "Henseler, Jorgen"]
[Result "1/2-1/2"]
[ECO "D11"]
[WhiteElo "1981"]
[BlackElo "2073"]
[PlyCount "61"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. e3 Bg4 4. c4 c6 5. Qb3 Qb6 6. Ne5 Bf5 7. Nc3 e6 8. c5 Qc7 9. Qd1 Nbd7 10. g4 Nxe5 11. gxf5 Ned7 12. fxe6 fxe6 13. f4 0-0-0 14. b4 h6 15. h4 g6 16. a4 Be7 17. Bd2 g5 18. b5 Kb8 19. a5 Bxc5 20. dxc5 Nxc5 21. b6 Qd6 22. bxa7+ Kxa7 23. a6 b6 24. Na4 Nxa4 25. Rxa4 gxf4 26. Rxf4 e5 27. Rf2 d4 28. e4 Nxe4 29. Rf7+ Rd7 30. Rxd7+ Qxd7 31. Bh3 1/2-1/2

[Event "Hilversum op-A"]
[Site "Hilversum"]
[Date "2010.06.26"]
[Round "1"]
[White "Nagtegaal, Kees"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "B43"]
[WhiteElo "2200"]
[BlackElo "1981"]
[PlyCount "61"]
[EventDate "2010.06.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 Qc7 6. Bd3 Bc5 7. Nb3 Be7 8. 0-0 Nf6 9. f4 d6 10. Qe2 Nbd7 11. Bd2 0-0 12. Rae1 e5 13. Nd5 Nxd5 14. exd5 f5 15. fxe5 Nxe5 16. Ba5 Qd7 17. Nd4 Qa4 18. Bc3 Nxd3 19. Qxd3 Bf6 20. Nf3 Bd7 21. Bxf6 Rxf6 22. b3 Qg4 23. Re7 Rg6 24. Rf2 f4 25. Nd4 f3 26. h3 Qg5 27. Rxd7 Qc1+ 28. Qf1 Qe3 29. Nxf3 Rf8 30. Qd3 Qe8 31. Rxb7 1-0

[Event "Waling Dijkstra Gr-A"]
[Site "Leeuwarden"]
[Date "2009.11.15"]
[Round "5"]
[White "Abma, Klaas"]
[Black "Kuiper, Willem"]
[Result "1/2-1/2"]
[ECO "D00"]
[WhiteElo "1977"]
[BlackElo "1791"]
[PlyCount "49"]
[EventDate "2009.11.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. Bf4 g6 4. Nc3 c6 5. Qd2 Nbd7 6. h3 a5 7. a4 Bg7 8. e3 Ne4 9. Nxe4 dxe4 10. Ng5 Nf6 11. Bc4 e6 12. f3 exf3 13. gxf3 Nd5 14. Bxd5 cxd5 15. h4 h6 16. Nh3 Qb6 17. c3 Bd7 18. Nf2 Rc8 19. Nd3 Qd8 20. Nc5 Bc6 21. Kf2 Bf6 22. h5 g5 23. Bg3 Be7 24. Nd3 0-0 25. Ne5 1/2-1/2

[Event "Waling Dijkstra Gr-A"]
[Site "Leeuwarden"]
[Date "2009.11.14"]
[Round "2"]
[White "Abma, Klaas"]
[Black "Lanchava, Tea"]
[Result "0-1"]
[ECO "B08"]
[WhiteElo "1977"]
[BlackElo "2350"]
[PlyCount "55"]
[EventDate "2009.11.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. d4 d6 2. e4 g6 3. Nc3 Bg7 4. Nf3 Nf6 5. Be3 c6 6. Bd3 0-0 7. Qd2 b5 8. h3 Nbd7 9. e5 Ne8 10. Bh6 dxe5 11. dxe5 Nc5 12. Bxg7 Kxg7 13. 0-0 Nc7 14. a4 Bf5 15. axb5 Bxd3 16. cxd3 Nb3 17. Qe3 Nxa1 18. Rxa1 cxb5 19. Rxa7 b4 20. Rxa8 Qxa8 21. Ne2 Qa1+ 22. Qc1 Ra8 23. Nfd4 Ra2 24. b3 Qxc1+ 25. Nxc1 Ra1 26. Nde2 Nd5 27. Kh2 Nc3 28. Kg3 0-1

[Event "Waling Dijkstra Gr-A"]
[Site "Leeuwarden"]
[Date "2009.11.14"]
[Round "4"]
[White "Abma, Klaas"]
[Black "Nicolai, Amir"]
[Result "0-1"]
[ECO "B08"]
[WhiteElo "1977"]
[BlackElo "1847"]
[PlyCount "76"]
[EventDate "2009.11.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Nc3 Bg7 4. e4 d6 5. Be3 c6 6. Bd3 b5 7. a4 b4 8. Ne2 a5 9. Qd2 h5 10. h3 Ba6 11. 0-0 Nfd7 12. c4 Nb6 13. b3 e6 14. Rad1 Ra7 15. Rfe1 0-0 16. Bg5 f6 17. Be3 e5 18. dxe5 dxe5 19. Nh4 Kh7 20. Ng3 N8d7 21. c5 Nxa4 22. bxa4 Bxd3 23. Qxd3 f5 24. Nxg6 f4 25. Nxf8+ Qxf8 26. Nxh5 fxe3 27. Qxe3 Bh6 28. Qf3 Qxf3 29. gxf3 Nxc5 30. Rd6 Nxa4 31. Rxc6 Nc3 32. Nf6+ Kh8 33. Nd5 Bd2 34. Ra1 Ne2+ 35. Kf1 Nf4 36. Rd1 Nxd5 37. Rxd2 a4 38. f4 a3 0-1

[Event "Waling Dijkstra Gr-A"]
[Site "Leeuwarden"]
[Date "2009.11.14"]
[Round "3"]
[White "Maris, Ivo"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "B43"]
[WhiteElo "1924"]
[BlackElo "1977"]
[PlyCount "75"]
[EventDate "2009.11.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. a4 Nf6 6. Nc3 Qc7 7. Bd3 Bc5 8. Be3 Qb6 9. a5 Qc7 10. 0-0 d6 11. Na4 Nbd7 12. c3 Ba7 13. b4 Ne5 14. b5 Bxd4 15. Bxd4 Nxd3 16. Qxd3 axb5 17. Nb6 Ra6 18. Rfb1 e5 19. Be3 Bd7 20. Rd1 Ke7 21. Bg5 Bc6 22. c4 b4 23. c5 dxc5 24. Qc4 Rxa5 25. Rxa5 Qxb6 26. Rxc5 Rd8 27. Rxe5+ Kf8 28. Rxd8+ Qxd8 29. Qxb4+ Kg8 30. h3 h6 31. Bxf6 Qxf6 32. Qd4 Qf4 33. Qc3 Bxe4 34. Re8+ Kh7 35. Qc4 f5 36. Qg8+ Kg6 37. Re6+ Kh5 38. Qf7+ 1-0

[Event "Waling Dijkstra Gr-A"]
[Site "Leeuwarden"]
[Date "2009.11.13"]
[Round "1"]
[White "Ootes, Lennart"]
[Black "Abma, Klaas"]
[Result "1/2-1/2"]
[ECO "B43"]
[WhiteElo "2128"]
[BlackElo "1977"]
[PlyCount "76"]
[EventDate "2009.11.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 Qc7 6. Bd3 Bc5 7. Nb3 Be7 8. 0-0 b5 9. a3 Bb7 10. Bd2 Nf6 11. f4 d6 12. Qe2 Nbd7 13. Kh1 Rc8 14. Nd4 0-0 15. Rae1 Nc5 16. e5 Nxd3 17. Qxd3 Nd7 18. Qh3 Qc4 19. Nf3 dxe5 20. fxe5 a5 21. Qg3 Kh8 22. Ng5 Bxg5 23. Qxg5 f6 24. exf6 gxf6 25. Qh6 Rg8 26. Rf2 Rg6 27. Qh3 Rcg8 28. Rg1 Rxg2 29. Rgxg2 Rxg2 30. Qxg2 Bxg2+ 31. Rxg2 b4 32. axb4 axb4 33. Ne2 Qxc2 34. Bh6 Qd1+ 35. Ng1 Qd5 36. h3 Ne5 37. Kh2 Nf3+ 38. Nxf3 Qxf3 1/2-1/2

[Event "Groningen op-B"]
[Site "Groningen"]
[Date "2008.12.30"]
[Round "9"]
[White "Abma, Klaas"]
[Black "Ten Vergert, Paul"]
[Result "0-1"]
[ECO "B01"]
[WhiteElo "1930"]
[BlackElo "1980"]
[PlyCount "30"]
[EventDate "2008.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 127 Extra"]
[Source "ChessBase"]
[SourceDate "2009.01.08"]
[SourceVersion "2"]
[SourceVersionDate "2009.01.28"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. Nf3 Bg4 5. Be2 e6 6. 0-0 Nc6 7. a3 0-0-0 8. Rb1 Nf6 9. b4 Qf5 10. Bb2 Bd6 11. Nb5 Bf4 12. Nfd4 Nxd4 13. Nxd4 Rxd4 14. Bxg4 Bxh2+ 15. Kxh2 Nxg4+ 0-1

[Event "Groningen op-B"]
[Site "Groningen"]
[Date "2008.12.28"]
[Round "7"]
[White "Abma, Klaas"]
[Black "Zuiderweg, Edwin"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "1930"]
[BlackElo "1952"]
[PlyCount "55"]
[EventDate "2008.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 127 Extra"]
[Source "ChessBase"]
[SourceDate "2009.01.08"]
[SourceVersion "2"]
[SourceVersionDate "2009.01.28"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Nf6 3. Nf3 Nxd5 4. d4 g6 5. c4 Nb6 6. Nc3 Bg7 7. c5 Nd5 8. Bc4 Nxc3 9. bxc3 0-0 10. 0-0 h6 11. Re1 Bg4 12. h3 Bxf3 13. Qxf3 c6 14. Bf4 e6 15. Rab1 Qc8 16. h4 Nd7 17. Bd6 Re8 18. h5 g5 19. Bb3 Nf6 20. c4 Nd7 21. Bc2 Nf8 22. d5 cxd5 23. cxd5 b6 24. dxe6 Rxe6 25. Rxe6 Nxe6 26. Be4 Nd4 27. Qd3 Nc6 28. Qd5 1-0

[Event "Groningen op-B"]
[Site "Groningen"]
[Date "2008.12.28"]
[Round "8"]
[White "Slagter, David"]
[Black "Abma, Klaas"]
[Result "1/2-1/2"]
[ECO "C17"]
[WhiteElo "1966"]
[BlackElo "1930"]
[PlyCount "50"]
[EventDate "2008.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 127 Extra"]
[Source "ChessBase"]
[SourceDate "2009.01.08"]
[SourceVersion "2"]
[SourceVersionDate "2009.01.28"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 Ne7 6. Nb5 Bxd2+ 7. Qxd2 0-0 8. dxc5 Nbc6 9. f4 f6 10. exf6 Rxf6 11. Bd3 e5 12. fxe5 Nxe5 13. 0-0-0 Nxd3+ 14. Qxd3 Bf5 15. Qb3 Rc8 16. Nd6 Bxc2 17. Qxc2 Rxd6 18. cxd6 Rxc2+ 19. Kxc2 Qxd6 20. Rd2 Qa6 21. Ne2 Qxa2 22. Nc3 Qc4 23. Kb1 d4 24. Ne2 d3 25. Nc1 Nc6 1/2-1/2

[Event "Groningen op-B"]
[Site "Groningen"]
[Date "2008.12.27"]
[Round "6"]
[White "Abma, Klaas"]
[Black "Davids, Bart"]
[Result "1-0"]
[ECO "B30"]
[WhiteElo "1930"]
[BlackElo "1930"]
[PlyCount "85"]
[EventDate "2008.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 127 Extra"]
[Source "ChessBase"]
[SourceDate "2009.01.08"]
[SourceVersion "2"]
[SourceVersionDate "2009.01.28"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 e6 4. Bxc6 bxc6 5. 0-0 c4 6. e5 f6 7. Qe2 Ba6 8. b3 fxe5 9. Nxe5 Bd6 10. Nxc4 Bc7 11. d3 Bxc4 12. bxc4 Qh4 13. g3 Qh3 14. Bb2 Nf6 15. Bxf6 gxf6 16. Nd2 h5 17. Qe4 0-0-0 18. c5 h4 19. Qg2 Qg4 20. Nc4 hxg3 21. fxg3 Rdg8 22. Nd6+ Bxd6 23. cxd6 Qd4+ 24. Qf2 Qxd6 25. Rab1 Rh5 26. Qf4 Qxf4 27. Rxf4 f5 28. Rfb4 Kc7 29. Rb7+ Kd6 30. Rxa7 f4 31. Rbb7 fxg3 32. Rxd7+ Ke5 33. Ra5+ Kf4 34. Rxh5 gxh2+ 35. Kxh2 Ra8 36. Rd4+ Kf3 37. Rh3+ Kf2 38. Rc4 Rg8 39. Rf4+ Ke2 40. Rg3 Rh8+ 41. Kg2 e5 42. Re4+ Kd2 43. Rxe5 1-0

[Event "IECC KO-3038"]
[Site "IECC email"]
[Date "2006.11.03"]
[Round "?"]
[White "Abma, Klaas"]
[Black "Stripes, James"]
[Result "1-0"]
[ECO "D31"]
[WhiteElo "1841"]
[BlackElo "1717"]
[PlyCount "49"]
[EventDate "2004.??.??"]
[EventType "match (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2011"]
[Source "ChessBase"]
[SourceDate "2010.08.31"]
[SourceVersion "1"]
[SourceVersionDate "2010.08.31"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "US of America"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "USA"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 Bb4 5. e5 c5 6. Bd2 Ne7 7. Nb5 Qa5 8. Bxb4 Qxb4+ 9. Qd2 Qxd2+ 10. Kxd2 Kd8 11. dxc5 Nd7 12. Nf3 Nc6 13. cxd5 exd5 14. Rc1 Ndxe5 15. Nxe5 Nxe5 16. Nd6 Kc7 17. f4 Nc6 18. Bb5 Bd7 19. Rhe1 f6 20. Bxc6 bxc6 21. Re7 Rab8 22. Rxg7 Rxb2+ 23. Kc3 Rbb8 24. Re1 Rbg8 25. Rf7 1-0

[Event "IECC KO-3038"]
[Site "IECC email"]
[Date "2006.11.03"]
[Round "?"]
[White "Stripes, James"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "D34"]
[WhiteElo "1707"]
[BlackElo "1851"]
[PlyCount "52"]
[EventDate "2004.??.??"]
[EventType "match (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2011"]
[Source "ChessBase"]
[SourceDate "2010.08.31"]
[SourceVersion "1"]
[SourceVersionDate "2010.08.31"]
[SourceQuality "1"]
[WhiteTeam "US of America"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "USA"]
[BlackTeamCountry "NED"]

1. d4 d5 2. c4 e6 3. Nf3 c5 4. Nc3 Nc6 5. cxd5 exd5 6. g3 Nf6 7. Bg2 Be7 8. 0-0 0-0 9. Be3 c4 10. b3 Bb4 11. Qc2 Qa5 12. Rfc1 Rd8 13. Ne5 Nxe5 14. dxe5 d4 15. Nd1 dxe3 16. exf6 Bf5 17. Be4 Rd2 18. Qb1 Bxe4 19. Qxe4 exf2+ 20. Nxf2 c3 21. fxg7 Qb5 22. Nd3 Ba5 23. Rf1 Re8 24. Qf3 Bb6+ 25. Kh1 Qc6 26. Qxc6 bxc6 0-1

[Event "IECG CP.2004.P.00011 email"]
[Site "IECG email"]
[Date "2004.10.03"]
[Round "1"]
[White "Abma, Klaas"]
[Black "Lahdenmaeki, Leo"]
[Result "1/2-1/2"]
[ECO "C59"]
[WhiteElo "1780"]
[BlackElo "1705"]
[PlyCount "65"]
[EventDate "2004.10.01"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Be2 h6 9. Nh3 Bc5 10. 0-0 0-0 11. d3 Nb7 12. Nd2 Nd6 13. Bf3 Qc7 14. c3 Re8 15. Qa4 Bxh3 16. gxh3 Rac8 17. Bg2 Qd7 18. Qd1 Qf5 19. Qf3 Qxf3 20. Bxf3 e4 21. dxe4 Ndxe4 22. Nxe4 Nxe4 23. Kg2 Rcd8 24. h4 Rd6 25. Re1 Rg6+ 26. Kf1 Rge6 27. Re2 Kf8 28. Bf4 Rf6 29. Rxe4 Rxe4 30. Bxe4 Rxf4 31. f3 Rxh4 32. Kg2 Bd6 33. h3 1/2-1/2

[Event "IECG CP.2004.P.00011 email"]
[Site "IECG email"]
[Date "2004.10.01"]
[Round "?"]
[White "Abma, Klaas"]
[Black "Adorjan, Attila"]
[Result "1-0"]
[ECO "B17"]
[PlyCount "67"]
[EventDate "2004.10.01"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Bc4 Ngf6 6. Ng5 e6 7. Qe2 Nb6 8. Bd3 h6 9. N5f3 c5 10. dxc5 Bxc5 11. Ne5 0-0 12. Ngf3 Nbd5 13. a3 a5 14. 0-0 Qc7 15. c4 Ne7 16. Bf4 Qb6 17. Rad1 Nh5 18. Be3 Bxe3 19. Qxe3 Qxe3 20. fxe3 Nf6 21. b3 b6 22. Bc2 Bb7 23. Nd7 Nxd7 24. Rxd7 Bxf3 25. gxf3 Rfe8 26. Rfd1 Nf5 27. Kf2 g6 28. Rb7 Rab8 29. Rdd7 Rf8 30. Rxf7 Rxb7 31. Rxb7 Rd8 32. Bxf5 exf5 33. Rxb6 Rd2+ 34. Kg3 1-0

[Event "IECG CP.2004.P.00011 email"]
[Site "IECG email"]
[Date "2004.10.01"]
[Round "?"]
[White "Altmann, Eduard"]
[Black "Abma, Klaas"]
[Result "1-0"]
[ECO "C06"]
[PlyCount "63"]
[EventDate "2004.10.01"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 f6 9. exf6 Nxf6 10. Nf3 Bd6 11. 0-0 Qc7 12. Bg5 0-0 13. Rc1 h6 14. Bd2 Ng4 15. Ng3 e5 16. dxe5 Ngxe5 17. Nxe5 Bxe5 18. Bb1 Qd7 19. Qb3 Qd6 20. Qc2 Bd7 21. Be3 Qf6 22. f4 Bd4 23. Bxd4 Qxd4+ 24. Kh1 Ne7 25. Qh7+ Kf7 26. Rc7 Ke8 27. Rxb7 Bc6 28. Rb3 Rxf4 29. Re1 Kf8 30. Rbe3 Ng8 31. Bf5 Be8 32. Rxe8+ 1-0

[Event "IECG CP.2004.P.00011 email"]
[Site "IECG email"]
[Date "2004.10.01"]
[Round "?"]
[White "Furman, Slavomir"]
[Black "Abma, Klaas"]
[Result "1/2-1/2"]
[ECO "A58"]
[PlyCount "53"]
[EventDate "2004.10.01"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. g3 g6 8. Nf3 Bg7 9. Bg2 Nbd7 10. 0-0 Nb6 11. Rb1 Bc4 12. Nd2 Bxa2 13. Nxa2 Rxa2 14. Qb3 Ra7 15. Qb5+ Nfd7 16. b4 Na4 17. Ne4 0-0 18. Bd2 Qa8 19. bxc5 Naxc5 20. Nxc5 Nxc5 21. Rfc1 Rc8 22. Bg5 h6 23. Bf4 Ra5 24. Qb4 Ra4 25. Qb5 Ra5 26. Qb4 Ra4 27. Qb5 1/2-1/2

[Event "IECG CP.2004.P.00011 email"]
[Site "IECG email"]
[Date "2004.10.01"]
[Round "?"]
[White "Krueger, Hilmar"]
[Black "Abma, Klaas"]
[Result "1/2-1/2"]
[ECO "C06"]
[PlyCount "119"]
[EventDate "2004.10.01"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 f6 9. exf6 Nxf6 10. Nf3 Bd6 11. 0-0 Qc7 12. h3 0-0 13. Be3 Bd7 14. Rc1 Rae8 15. a3 Qb8 16. Nc3 a6 17. Re1 b5 18. Bg5 h6 19. Be3 e5 20. Bg6 e4 21. Bxe8 Qxe8 22. Nd2 Qg6 23. Kh1 b4 24. Ne2 Ne7 25. axb4 Nf5 26. Nf4 Qf7 27. Qb3 Bb5 28. Rc5 Bxf4 29. Bxf4 Nxd4 30. Qe3 Ne6 31. Be5 Nxc5 32. bxc5 Re8 33. Bd6 Nh7 34. Nb3 Ng5 35. Nd4 Bd3 36. c6 Qf6 37. Bf4 Ne6 38. Nxe6 Qxe6 39. c7 Bb5 40. Qd4 Bd7 41. Rd1 Bc6 42. Be5 Qd7 43. Kg1 Bb7 44. Rc1 Qe7 45. Qb6 Bc8 46. Bd4 Qd7 47. Rc5 Re7 48. Qb3 Kh7 49. Qg3 Rf7 50. b4 Re7 51. Qb3 Qe6 52. Qc3 Qf5 53. Rc6 Qf7 54. Qc5 Rd7 55. Qb6 Qh5 56. Kh2 Re7 57. Qc5 Qf7 58. Qd6 Rd7 59. Qg3 Re7 60. Rc5 1/2-1/2

[Event "IECC KO-3038"]
[Site "IECC email"]
[Date "2004.04.16"]
[Round "?"]
[White "Abma, Klaas"]
[Black "Washburn, David"]
[Result "1-0"]
[ECO "C43"]
[WhiteElo "1809"]
[BlackElo "1607"]
[PlyCount "23"]
[EventDate "2004.??.??"]
[EventType "match (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2020"]
[Source "ChessBase"]
[SourceDate "2019.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2019.09.30"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "United States"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "USA"]

1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Nd7 6. Qe2 Nxe5 7. Bxe4 dxe4 8. Qxe4 Bd6 9. dxe5 Qe7 10. 0-0 Bxe5 11. Re1 Bd6 12. Qa4+ 1-0

[Event "IECC KO-3038"]
[Site "IECC email"]
[Date "2004.04.16"]
[Round "?"]
[White "Washburn, David"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "C06"]
[WhiteElo "1616"]
[BlackElo "1800"]
[PlyCount "32"]
[EventDate "2004.??.??"]
[EventType "match (corr)"]
[EventRounds "2"]
[SourceTitle "Corr 2020"]
[Source "ChessBase"]
[SourceDate "2019.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2019.09.30"]
[SourceQuality "1"]
[WhiteTeam "United States"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "USA"]
[BlackTeamCountry "NED"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 f6 9. Nf4 Nxd4 10. Qh5+ Ke7 11. Ng6+ hxg6 12. exf6+ Nxf6 13. Qxh8 Kf7 14. f4 Nh5 15. 0-0 Ne2+ 16. Kh1 Qh4 0-1

[Event "IECG CC.2004.0.00091 email"]
[Site "IECG email"]
[Date "2004.03.24"]
[Round "?"]
[White "Abma, Klaas"]
[Black "Gladis, Daniel"]
[Result "0-1"]
[ECO "C43"]
[PlyCount "100"]
[EventDate "2004.03.24"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Nd7 6. Qe2 Qe7 7. Bxe4 dxe4 8. Bf4 Nxe5 9. Bxe5 Bf5 10. Nc3 0-0-0 11. Nb5 c6 12. Nxa7+ Kd7 13. 0-0 Ra8 14. Nb5 cxb5 15. f3 Qe6 16. fxe4 Bg6 17. Qxb5+ Qc6 18. Qd3 f6 19. d5 Bc5+ 20. Kh1 Qb6 21. b4 fxe5 22. bxc5 Qxc5 23. Rab1 b6 24. Rb5 Qd6 25. Rfb1 Ra3 26. Qd1 Rb8 27. c4 Rc3 28. Qe2 Qf6 29. c5 Qf4 30. c6+ Kc7 31. d6+ Kxc6 32. Qb2 Qe3 33. Rxe5 Kxd6 34. Qb4+ Rc5 35. Rd5+ Kc7 36. Rbd1 Rxd5 37. Qe7+ Kc8 38. Qe6+ Kb7 39. Qxd5+ Ka6 40. Qc4+ b5 41. Qe6+ Ka5 42. Qd7 Qc5 43. e5 Qxe5 44. Qa7+ Kb4 45. Rd4+ Kc3 46. Rd1 Kb2 47. Qf2+ Bc2 48. Qd2 Qc5 49. Qc1+ Kxa2 50. Rd2 Rc8 0-1

[Event "IECG CC.2004.0.00091 email"]
[Site "IECG email"]
[Date "2004.03.24"]
[Round "?"]
[White "Abma, Klaas"]
[Black "Wirth, Reinhard"]
[Result "1/2-1/2"]
[ECO "C54"]
[WhiteElo "1780"]
[BlackElo "1700"]
[PlyCount "139"]
[EventDate "2004.03.24"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.19"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. 0-0 Bxc3 9. d5 Bf6 10. Re1 Ne7 11. Rxe4 d6 12. Bg5 Bxg5 13. Nxg5 h6 14. Qe2 hxg5 15. Re1 Be6 16. dxe6 f6 17. Re3 c6 18. Ra3 d5 19. Bd3 Qd6 20. g3 a6 21. Qg4 0-0-0 22. Rc3 d4 23. Rc2 Rh6 24. h3 Kb8 25. Rd2 Rhh8 26. a3 c5 27. b4 cxb4 28. axb4 Nc6 29. b5 axb5 30. e7 Nxe7 31. Bxb5 Ng6 32. Bf1 Ne5 33. Qd1 Rhe8 34. Bg2 Qa3 35. Rf1 d3 36. Qb1 Rd7 37. Ra2 Qc5 38. Qa1 Kc7 39. Rb1 b5 40. Rc1 Nc4 41. Bf1 d2 42. Rd1 Qd4 43. Qb1 Re5 44. Qb4 Qc5 45. Qc3 Re1 46. Rxe1 b4 47. Qa1 dxe1Q 48. Qxe1 Ne5 49. Bg2 Rd4 50. Qa1 Kd8 51. Kh2 Ke7 52. Qb1 Kf7 53. Qh7 Rd8 54. Qh5+ Kg8 55. Be4 Nf7 56. Rc2 Qd4 57. Bg6 Qd7 58. Rb2 Rb8 59. Bc2 Nh6 60. Qg6 Kf8 61. Qh7 Nf7 62. Bb3 Qc6 63. Rd2 Qc3 64. Rd3 Qe1 65. Qf5 Qe5 66. Qg6 Qc7 67. Rd4 Qa7 68. Rd2 Qb7 69. Bd5 Qa7 70. Re2 1/2-1/2

[Event "IECG CC.2004.0.00091 email"]
[Site "IECG email"]
[Date "2004.03.24"]
[Round "?"]
[White "Caridi, Nicolo"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "D34"]
[PlyCount "96"]
[EventDate "2004.03.24"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c5 4. cxd5 exd5 5. g3 Nc6 6. Bg2 Nf6 7. 0-0 Be7 8. Nc3 0-0 9. Bg5 cxd4 10. Nxd4 h6 11. Be3 Re8 12. Qb3 Na5 13. Qc2 Bg4 14. Nf5 Bb4 15. Bd4 Bxc3 16. Bxc3 Rxe2 17. Qd3 Re8 18. Ne3 Be6 19. Qb5 b6 20. Rad1 Rc8 21. Rfe1 Rc5 22. Qd3 Nc4 23. Nxc4 Rxc4 24. Bxf6 Qxf6 25. Bxd5 Rcc8 26. Bxe6 Rxe6 27. Rxe6 Qxe6 28. Qd7 Rc2 29. Qxe6 fxe6 30. Rd7 a5 31. b3 Rxa2 32. Rb7 Rb2 33. Rxb6 a4 34. b4 e5 35. b5 a3 36. Ra6 a2 37. Kg2 e4 38. Kh3 Rxf2 39. b6 Rb2 40. b7 Rxb7 41. Rxa2 Rb5 42. Re2 Re5 43. Kg4 g5 44. h4 Kf7 45. Kh5 Kf6 46. Kxh6 gxh4 47. gxh4 e3 48. h5 Kf7 0-1

[Event "IECG CC.2004.0.00091 email"]
[Site "IECG email"]
[Date "2004.03.24"]
[Round "?"]
[White "Coates, Stephen"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "C18"]
[PlyCount "50"]
[EventDate "2004.03.24"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7 7. Qg4 f6 8. Nf3 c4 9. Qg3 Nc6 10. exf6 Qxg3 11. f7+ Kxf7 12. hxg3 Nf6 13. Ng5+ Kg6 14. Be2 e5 15. dxe5 Nxe5 16. Bf4 Nc6 17. 0-0-0 h6 18. Nf3 Re8 19. Rhe1 Bg4 20. Be3 Kf7 21. Bd4 Bxf3 22. Bxf3 Nxd4 23. Rxe8 Rxe8 24. cxd4 g5 25. Rh1 c3 0-1

[Event "IECG CC.2004.0.00091 email"]
[Site "IECG email"]
[Date "2004.03.24"]
[Round "?"]
[White "Suarez, Ron"]
[Black "Abma, Klaas"]
[Result "0-1"]
[ECO "C02"]
[PlyCount "86"]
[EventDate "2004.03.24"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2008"]
[Source "ChessBase"]
[SourceDate "2008.06.24"]
[SourceVersion "1"]
[SourceVersionDate "2008.06.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Bd3 cxd4 7. cxd4 Bd7 8. Nc3 Nxd4 9. Nxd4 Qxd4 10. 0-0 a6 11. Kh1 Ne7 12. f4 Nc6 13. a3 Na5 14. Rf3 Qb6 15. b4 Nc4 16. Bxc4 dxc4 17. Be3 Qc7 18. Qg1 b5 19. Bb6 Qb7 20. Rg3 Bc6 21. Rd1 h5 22. h4 Rc8 23. Kh2 g6 24. Qf2 Be7 25. Kh3 Be4 26. Nxe4 Qxe4 27. Rc3 Qf5+ 28. Kh2 Qg4 29. Qd2 0-0 30. g3 f6 31. exf6 Bxf6 32. Rcc1 Bxh4 33. Qe3 Be7 34. Re1 Rc6 35. Bd4 h4 36. Rg1 Bd6 37. Be5 Bxe5 38. Qxe5 Rd8 39. Rc2 Rcd6 40. Qe2 hxg3+ 41. Rxg3 Qxf4 42. Qe3 Rd2+ 43. Rxd2 Rxd2+ 0-1

