[Event "EU Corporate-ch"]
[Site "Rotterdam"]
[Date "2022.06.19"]
[Round "7"]
[White "Groenewold, Jan Joris"]
[Black "Beardsley, Benjamin"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "2134"]
[PlyCount "35"]
[EventDate "2022.06.18"]
[EventType "team-tourn (rapid)"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. Bf4 g6 3. e3 Bg7 4. Nc3 c6 5. h4 Nf6 6. h5 Nxh5 7. Rxh5 gxh5 8. Qxh5 Be6 9. Nf3 Nd7 10. Ng5 Nf6 11. Qh2 Qd7 12. Bd3 h6 13. Nf3 Ng4 14. Qg3 h5 15. 0-0-0 Bf6 16. Ne5 Bxe5 17. Bxe5 Nxe5 18. dxe5 1-0

[Event "EU Corporate-ch"]
[Site "Rotterdam"]
[Date "2022.06.19"]
[Round "8"]
[White "Groenewold, Jan Joris"]
[Black "Maral, Pranav"]
[Result "1-0"]
[ECO "E11"]
[WhiteElo "2134"]
[BlackElo "1329"]
[PlyCount "51"]
[EventDate "2022.06.18"]
[EventType "team-tourn (rapid)"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. g3 Bb4+ 5. Bd2 a5 6. Bg2 0-0 7. 0-0 Ra7 8. Qc2 b6 9. Rd1 dxc4 10. Bg5 h6 11. Bf4 Nd5 12. Bc1 b5 13. e4 Nf6 14. Nc3 Bxc3 15. bxc3 Qe7 16. Rb1 Bd7 17. Ne5 Be8 18. a4 Rb7 19. Nxc4 c6 20. axb5 cxb5 21. Nxa5 Ra7 22. Nb3 Nc6 23. d5 exd5 24. exd5 Na5 25. Be3 Ra6 26. Bc5 1-0

[Event "EU Corporate-ch"]
[Site "Rotterdam"]
[Date "2022.06.18"]
[Round "4"]
[White "Groenewold, Jan Joris"]
[Black "Malachi, Avraham"]
[Result "0-1"]
[ECO "A70"]
[WhiteElo "2134"]
[BlackElo "1997"]
[PlyCount "66"]
[EventDate "2022.06.18"]
[EventType "team-tourn (rapid)"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 c5 7. d5 e6 8. Bd3 exd5 9. cxd5 Nbd7 10. 0-0 Re8 11. Re1 a6 12. a4 Ne5 13. Nxe5 dxe5 14. Be3 Qd6 15. a5 Bd7 16. Nb1 Bb5 17. Qc2 Rac8 18. Na3 Bxd3 19. Qxd3 Nd7 20. Nc4 Qe7 21. Qb3 Rb8 22. Rac1 f5 23. f3 Kh8 24. Red1 fxe4 25. fxe4 Qh4 26. Qd3 Nf6 27. Nd2 Bh6 28. Bxh6 Qxh6 29. Rxc5 Nh5 30. d6 Nf4 31. d7 Nxd3 32. dxe8Q+ Rxe8 33. Rc3 Nxb2 0-1

[Event "EU Corporate-ch"]
[Site "Rotterdam"]
[Date "2022.06.18"]
[Round "2"]
[White "Groenewold, Jan Joris"]
[Black "Wisniewski, Jacek"]
[Result "0-1"]
[ECO "E90"]
[WhiteElo "2134"]
[BlackElo "1850"]
[PlyCount "86"]
[EventDate "2022.06.18"]
[EventType "team-tourn (rapid)"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 e5 7. d5 a5 8. Be3 Na6 9. g4 b6 10. Nd2 Nc5 11. b3 Ne8 12. g5 f5 13. gxf6 Nxf6 14. Be2 Bd7 15. a3 Qc8 16. b4 Nb7 17. h4 Ng4 18. Bxg4 Bxg4 19. f3 axb4 20. axb4 Rxa1 21. Qxa1 Bxf3 22. Nxf3 Rxf3 23. Kd2 Nd8 24. Qd1 Rh3 25. h5 gxh5 26. Rg1 Nf7 27. Qf1 Rh2+ 28. Kd3 Qh3 29. Nb5 Ng5 30. Nxc7 Nf3 31. Qxh3 Rxh3 32. Ra1 Nd4 33. Rg1 Kf7 34. Kd2 Nf3+ 35. Ke2 Nxg1+ 36. Bxg1 Rc3 37. Nb5 Rc1 38. Bxb6 Bf8 39. Kd3 h4 40. Be3 Rb1 41. c5 dxc5 42. Nc3 Rxb4 43. Bg1 h3 0-1

[Event "EU Corporate-ch"]
[Site "Rotterdam"]
[Date "2022.06.18"]
[Round "1"]
[White "Vosooghi Dizaji, Mehdi"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "B23"]
[WhiteElo "1878"]
[BlackElo "2134"]
[PlyCount "129"]
[EventDate "2022.06.18"]
[EventType "team-tourn (rapid)"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. Bc4 a6 4. a4 Nc6 5. f4 Nf6 6. e5 d5 7. exd6 Bxd6 8. d3 Qc7 9. Nge2 0-0 10. 0-0 Rb8 11. Ne4 Be7 12. Qe1 b5 13. axb5 axb5 14. Bb3 Nb4 15. Bd2 Nbd5 16. c3 b4 17. Bc4 Nb6 18. Bb3 c4 19. Nxf6+ Bxf6 20. dxc4 Nxc4 21. cxb4 Nxd2 22. Qxd2 Qb6+ 23. Kh1 Qxb4 24. Qxb4 Rxb4 25. Rf3 Bb7 26. Rg3 Bxb2 27. Rb1 Bf6 28. f5 Bd5 29. fxe6 fxe6 30. Nf4 Bxb3 31. Rgxb3 Rxb3 32. Rxb3 Be5 33. g3 Bxf4 34. gxf4 Rxf4 35. Rb8+ Kf7 36. Rb7+ Kf6 37. Kg2 h5 38. Kg3 g5 39. Rb8 Rg4+ 40. Kf3 Rh4 41. Kg3 Ra4 42. Rh8 Ra3+ 43. Kg2 h4 44. Rh6+ Kf5 45. Rh8 e5 46. Rf8+ Kg4 47. Re8 Ra2+ 48. Kg1 Kf4 49. Rf8+ Ke3 50. Rf5 h3 51. Rxe5+ Kf3 52. Re1 g4 53. Rf1+ Ke3 54. Re1+ Kf4 55. Rf1+ Kg5 56. Rc1 Ra4 57. Rc5+ Kf4 58. Rc1 Ra3 59. Rf1+ Rf3 60. Ra1 g3 61. Ra4+ Ke3 62. Ra3+ Kf4 63. hxg3+ Rxg3+ 64. Rxg3 Kxg3 65. Kh1 1/2-1/2

[Event "NED-chT 1516"]
[Site "Netherlands"]
[Date "2015.10.10"]
[Round "2.8"]
[White "Erwich, Frank"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "E19"]
[WhiteElo "2370"]
[BlackElo "2164"]
[PlyCount "112"]
[EventDate "2015.09.26"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 168 Extra"]
[Source "ChessBase"]
[SourceDate "2015.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.29"]
[SourceQuality "1"]
[WhiteTeam "BSG"]
[BlackTeam "SISSA"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 e6 5. 0-0 Be7 6. c4 0-0 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3 c5 10. Rd1 d6 11. d5 exd5 12. cxd5 Bf6 13. Qb3 Re8 14. e3 Nd7 15. Nd2 Qc7 16. Ne4 Be7 17. f4 Rac8 18. Nf2 c4 19. Qc2 b5 20. Bd2 Nc5 21. Bc3 Qd8 22. Re1 Bf6 23. e4 Bxc3 24. Qxc3 Qb6 25. Qd4 f6 26. e5 fxe5 27. fxe5 dxe5 28. Qe3 Rcd8 29. Rad1 Rd6 30. b4 Nd7 31. Ne4 Qxe3+ 32. Rxe3 Rb6 33. Nc5 Bc8 34. Rde1 Rd6 35. Nxd7 Bxd7 36. Rxe5 Rxe5 37. Rxe5 Kf7 38. Kf2 Ra6 39. Re2 Bf5 40. Ke3 Bb1 41. Kd4 Rxa2 42. Rxa2 Bxa2 43. Be4 g6 44. Kc5 Ke8 45. Kxb5 Bb3 46. Ka6 c3 47. Kxa7 c2 48. Bxc2 Bxc2 49. b5 Be4 50. d6 Kd7 51. b6 Kxd6 52. b7 Bxb7 53. Kxb7 Ke5 54. Kc7 Ke4 55. Kd6 Kf3 56. Ke6 Kg2 1-0

[Event "Groningen Atlantis op"]
[Site "Groningen"]
[Date "2015.08.30"]
[Round "6"]
[White "Groenewold, Jan Joris"]
[Black "Walinga, Eric Jan"]
[Result "0-1"]
[ECO "E73"]
[WhiteElo "2164"]
[BlackElo "2010"]
[PlyCount "56"]
[EventDate "2015.08.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Bg5 Nbd7 7. h4 c5 8. d5 Qa5 9. Qc2 a6 10. g3 b5 11. cxb5 Ne5 12. Bd2 axb5 13. Nxb5 Qb6 14. Na3 Ba6 15. g4 Nexg4 16. Bxa6 Qxa6 17. Nc4 Nd7 18. Ne2 Nb6 19. Nxb6 Qxb6 20. Bc3 Bxc3+ 21. Nxc3 Rfb8 22. Rb1 Qb4 23. Qd2 Qd4 24. Ke2 Qxf2+ 25. Kd1 Rb4 26. Rh3 Rd4 27. Rd3 Ne3+ 28. Rxe3 Qxd2# 0-1

[Event "Groningen Atlantis op"]
[Site "Groningen"]
[Date "2015.08.30"]
[Round "7"]
[White "Van Foreest, Lucas"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "A01"]
[WhiteElo "2293"]
[BlackElo "2164"]
[PlyCount "68"]
[EventDate "2015.08.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. b3 e5 2. Bb2 Nc6 3. e3 Nf6 4. Nf3 d6 5. c4 Be7 6. d4 exd4 7. exd4 Bg4 8. Be2 0-0 9. 0-0 Re8 10. h3 Bh5 11. d5 Nb8 12. Nd4 Bg6 13. Bd3 Nfd7 14. Bxg6 hxg6 15. Re1 Bf6 16. Rxe8+ Qxe8 17. Nd2 c5 18. dxc6 Nxc6 19. N2f3 Nde5 20. Nxe5 Qxe5 21. Nxc6 Qxb2 22. Rb1 Qxa2 23. Nb4 Qa5 24. Nd5 Re8 25. Nxf6+ gxf6 26. Qxd6 Re1+ 27. Rxe1 Qxe1+ 28. Kh2 Qxf2 29. Qb8+ Kg7 30. Qxb7 Qf4+ 31. Kh1 Qc1+ 32. Kh2 Qf4+ 33. Kh1 Qc1+ 34. Kh2 Qf4+ 1/2-1/2

[Event "Groningen Atlantis op"]
[Site "Groningen"]
[Date "2015.08.29"]
[Round "5"]
[White "Ernst, Sipke"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "E11"]
[WhiteElo "2544"]
[BlackElo "2164"]
[PlyCount "95"]
[EventDate "2015.08.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ 4. Nbd2 d5 5. Qa4+ Nc6 6. a3 Be7 7. e3 0-0 8. b4 Re8 9. Bb2 Bf8 10. Bd3 e5 11. dxe5 Ng4 12. cxd5 Qxd5 13. Qc2 Ngxe5 14. Bxh7+ Kh8 15. Be4 Nxf3+ 16. Bxf3 Nd4 17. Bxd4 Qxd4 18. 0-0 Qe5 19. Rac1 c6 20. Nc4 Qe7 21. Rfd1 Rd8 22. Rxd8 Qxd8 23. Na5 Qe7 24. Qd1 Qf6 25. Qd4 Be7 26. h3 Qg5 27. Kf1 Be6 28. Kg1 Bf6 29. Qc5 Qxc5 30. bxc5 Bb2 31. Rc2 Bxa3 32. Nxb7 Rc8 33. Na5 Bd7 34. Rc4 Rc7 35. Bg4 f5 36. Bf3 Be6 37. Rc2 Bd7 38. Nb3 Bb4 39. Ra2 Kg8 40. Ra4 Rb7 41. Na5 Rb5 42. Bxc6 Rxc5 43. Rxb4 Bxc6 44. Nxc6 Rxc6 45. Rb5 Rf6 46. Ra5 a6 47. g3 Kf7 48. Kg2 1-0

[Event "Groningen Atlantis op"]
[Site "Groningen"]
[Date "2015.08.29"]
[Round "4"]
[White "Groenewold, Jan Joris"]
[Black "Hummel, Paul"]
[Result "1/2-1/2"]
[ECO "A01"]
[WhiteElo "2164"]
[BlackElo "2037"]
[PlyCount "135"]
[EventDate "2015.08.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. b3 e5 2. Bb2 Nc6 3. e3 d5 4. c4 d4 5. Nf3 Bg4 6. d3 Bc5 7. e4 Nge7 8. a3 a5 9. Be2 Qd6 10. Ng5 Bxe2 11. Qxe2 0-0 12. Bc1 f6 13. Nh3 Ng6 14. g3 Rae8 15. f3 Nce7 16. Nd2 Ba7 17. 0-0 Qd7 18. Kg2 f5 19. exf5 Nxf5 20. Ne4 Ne3+ 21. Bxe3 dxe3 22. c5 Qd4 23. Rac1 Rd8 24. Rfd1 Ne7 25. Rc4 Qd7 26. Qxe3 Nf5 27. Qd2 Nd4 28. Ng1 b5 29. Rc3 Qd5 30. b4 a4 31. Rf1 c6 32. Rf2 Bb8 33. Qa2 Nb3 34. Ne2 Rf7 35. Qb1 h6 36. Qf1 Rdf8 37. Ng1 g5 38. h3 Nd4 39. Kh2 Rf5 40. g4 Rf4 41. h4 gxh4 42. Qh3 Qd8 43. Rc1 Qe7 44. Rcf1 R4f7 45. Kh1 Ne6 46. Rh2 Ng5 47. Qxh4 Nxe4 48. dxe4 Qxh4 49. Rxh4 Kg7 50. Rd1 Bc7 51. Rh2 Kg6 52. Rhd2 Kg5 53. Kg2 h5 54. gxh5 Kxh5 55. Rd7 Kg5 56. Nh3+ Kf6 57. Nf2 Ke6 58. Rxf7 Rxf7 59. Ng4 Rd7 60. Rxd7 Kxd7 61. Kg3 Ke6 62. Nf2 Bd8 63. Kg4 Bf6 64. Nd3 Bg7 65. Kg5 Bf6+ 66. Kg4 Bg7 67. Kg5 Bf6+ 68. Kg4 1/2-1/2

[Event "Groningen Atlantis op"]
[Site "Groningen"]
[Date "2015.08.28"]
[Round "3"]
[White "Groenewold, Jan Joris"]
[Black "Van der Meiden, Dirk"]
[Result "1-0"]
[ECO "E15"]
[WhiteElo "2164"]
[BlackElo "2104"]
[PlyCount "35"]
[EventDate "2015.08.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Ba6 5. Qa4 c6 6. Bg2 Be7 7. Nc3 0-0 8. Ne5 Qc8 9. 0-0 d5 10. Bf4 Nh5 11. cxd5 Nxf4 12. gxf4 b5 13. Qb3 b4 14. dxe6 fxe6 15. Bh3 Kh8 16. Bxe6 Qc7 17. Nd5 cxd5 18. Ng6+ 1-0

[Event "Groningen Atlantis op"]
[Site "Groningen"]
[Date "2015.08.27"]
[Round "1"]
[White "Piket, Roel"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "A01"]
[BlackElo "2164"]
[PlyCount "50"]
[EventDate "2015.08.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. b3 e5 2. Bb2 Nc6 3. e3 Nf6 4. Nf3 e4 5. Ne5 Ne7 6. d3 d6 7. Nc4 d5 8. Ncd2 Ng6 9. dxe4 dxe4 10. Nc3 Bf5 11. h3 h5 12. Qe2 c6 13. 0-0-0 Qc7 14. g3 0-0-0 15. Rg1 Ne5 16. Bg2 Qa5 17. Nc4 Nxc4 18. Qxc4 Rxd1+ 19. Rxd1 Be6 20. Qd4 Be7 21. Nxe4 Rd8 22. Qe5 Rxd1+ 23. Kxd1 Qxe5 24. Bxe5 Nxe4 25. Bxe4 Bf6 1/2-1/2

[Event "Terre degli Elimi op 4th"]
[Site "Erice"]
[Date "2013.07.28"]
[Round "7"]
[White "Bartel, Marta"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "A84"]
[WhiteElo "2297"]
[BlackElo "2175"]
[PlyCount "53"]
[EventDate "2013.07.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "ITA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. Nf3 f5 2. d4 Nf6 3. g3 g6 4. c4 Bg7 5. b4 Ne4 6. Nbd2 c5 7. bxc5 Qa5 8. Bb2 Nxc5 9. Bg2 Nc6 10. 0-0 Na4 11. Qc1 Nxb2 12. Qxb2 0-0 13. Nb3 Qc7 14. Rac1 Rb8 15. Qa3 b5 16. cxb5 Rxb5 17. Qxe7 Qb6 18. Qa3 Nb4 19. e3 d6 20. Nfd2 Qa6 21. Qxa6 Bxa6 22. Rc7 Rb6 23. Ra1 Rf7 24. Rc3 Rd7 25. a3 Nd3 26. Rb1 d5 27. Bf1 1-0

[Event "Terre degli Elimi op 4th"]
[Site "Erice"]
[Date "2013.07.27"]
[Round "5"]
[White "Groenewold, Jan Joris"]
[Black "Cazacu, Gabriela"]
[Result "1-0"]
[ECO "A38"]
[WhiteElo "2175"]
[BlackElo "1845"]
[PlyCount "105"]
[EventDate "2013.07.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "ITA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 c5 3. c4 cxd4 4. Nxd4 Nc6 5. g3 g6 6. Bg2 Bg7 7. 0-0 0-0 8. Nc3 a6 9. Nc2 d6 10. Rb1 Qc7 11. Bg5 Be6 12. Ne3 Rab8 13. Bxf6 exf6 14. Ned5 Qd8 15. Ne4 Bxd5 16. Qxd5 f5 17. Nxd6 Ne7 18. Qc5 b6 19. Qa3 Qc7 20. Rfd1 Rfd8 21. Rd3 Nc6 22. Rbd1 Bf8 23. c5 bxc5 24. Qxc5 Qb6 25. Qxc6 Qxc6 26. Bxc6 Rb6 27. Nc4 Rxd3 28. Rxd3 Rxc6 29. b3 a5 30. a4 Bb4 31. Rd5 Kg7 32. Nxa5 Rc3 33. Nb7 Rxb3 34. Rb5 Rb2 35. a5 Bc3 36. Rxb2 Bxb2 37. e3 Be5 38. a6 Bb8 39. Nd6 Ba7 40. Nb5 Bb6 41. a7 Bxa7 42. Nxa7 Kf6 43. Kg2 Ke5 44. Kf3 f6 45. Nc6+ Ke6 46. Nd4+ Ke5 47. Ke2 g5 48. Nc6+ Kd5 49. Nd4 Ke5 50. Kd3 f4 51. gxf4+ gxf4 52. e4 h6 53. Nf5 1-0

[Event "Terre degli Elimi op 4th"]
[Site "Erice"]
[Date "2013.07.27"]
[Round "6"]
[White "Stirpe, Claudio"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "E32"]
[WhiteElo "2029"]
[BlackElo "2175"]
[PlyCount "142"]
[EventDate "2013.07.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "ITA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 b6 5. e4 c5 6. d5 exd5 7. exd5 Qe7+ 8. Qe2 Ne4 9. Bd2 Bxc3 10. Bxc3 Nxc3 11. Qxe7+ Kxe7 12. bxc3 d6 13. Bd3 Nd7 14. Nf3 Nf6 15. 0-0 Bg4 16. Nh4 Rae8 17. Nf5+ Bxf5 18. Bxf5 Kd8 19. Rfe1 Rxe1+ 20. Rxe1 Re8 21. Kf1 Rxe1+ 22. Kxe1 a6 23. a4 b5 24. cxb5 axb5 25. axb5 c4 26. Kd2 g6 27. Bc2 Nxd5 28. Be4 Nf6 29. Bf3 Kc7 30. Ke3 Kb6 31. Bc6 Kc5 32. f3 Ng8 33. g4 Ne7 34. Be8 Nd5+ 35. Kd2 f6 36. Bf7 Nb6 37. Be8 g5 38. Ke3 Nd5+ 39. Kd2 Nc7 40. b6 Kxb6 41. Ba4 Kc5 42. Bc2 h6 43. Bd1 d5 44. Bc2 d4 45. cxd4+ Kxd4 46. Be4 Ne6 47. Bf5 Nc7 48. Be4 c3+ 49. Kc2 Nb5 50. Bf5 Nd6 51. Bd7 Nc4 52. Bc6 Ne3+ 53. Kc1 Nc4 54. h3 Nd2 55. Kc2 Nc4 56. Bb7 Na3+ 57. Kb3 Nb5 58. Bc6 Nc7 59. Kc2 Ne6 60. Bb5 Nf4 61. Bf1 Nd5 62. Bb5 Nb4+ 63. Kb3 Nd3 64. Kc2 Ne1+ 65. Kd1 Nxf3 66. Kc2 Ng1 67. Bf1 Ke3 68. Kxc3 Kf2 69. Bb5 Kg3 70. Kd3 Nxh3 71. Bd7 Nf2+ 0-1

[Event "Terre degli Elimi op 4th"]
[Site "Erice"]
[Date "2013.07.26"]
[Round "4"]
[White "Piazza, Dario"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "B43"]
[WhiteElo "1881"]
[BlackElo "2175"]
[PlyCount "42"]
[EventDate "2013.07.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "ITA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Ne7 6. Be3 Nec6 7. Nb3 b5 8. Be2 d6 9. 0-0 Bb7 10. f4 Nd7 11. a3 Na5 12. Nxa5 Qxa5 13. Bf3 Rc8 14. Qd2 Be7 15. Rf2 Qc7 16. g4 0-0 17. g5 Nb6 18. Qd4 Nc4 19. Rd1 e5 20. fxe5 dxe5 21. Qd3 Nxb2 0-1

[Event "Terre degli Elimi op 4th"]
[Site "Erice"]
[Date "2013.07.25"]
[Round "3"]
[White "Groenewold, Jan Joris"]
[Black "Savalla, Pietro"]
[Result "1/2-1/2"]
[ECO "E01"]
[WhiteElo "2175"]
[BlackElo "1909"]
[PlyCount "52"]
[EventDate "2013.07.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "ITA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. g3 c6 5. Qc2 Bd6 6. Bg2 Nbd7 7. 0-0 0-0 8. Rd1 Qe7 9. cxd5 exd5 10. Nc3 Re8 11. a3 Nb6 12. Nh4 Ne4 13. Re1 Nxc3 14. bxc3 Be6 15. Nf5 Bxf5 16. Qxf5 Qd7 17. Qd3 Rad8 18. a4 Bc7 19. h4 Nc4 20. e4 f6 21. f4 f5 22. e5 h5 23. Ba3 g6 24. Reb1 Rb8 25. Bc1 a6 26. Ba3 b6 1/2-1/2

[Event "Terre degli Elimi op 4th"]
[Site "Erice"]
[Date "2013.07.25"]
[Round "2"]
[White "Van Weersel, Arlette"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "C41"]
[WhiteElo "2176"]
[BlackElo "2175"]
[PlyCount "109"]
[EventDate "2013.07.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "ITA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 d6 3. Bc4 Be7 4. c3 Nf6 5. d3 Nbd7 6. Bxf7+ Kxf7 7. Ng5+ Kg6 8. h4 h5 9. Qf3 Nc5 10. b4 Rf8 11. bxc5 Ng4 12. Qg3 Rxf2 13. Nf3 Qg8 14. Nbd2 Kh7 15. Nc4 b5 16. cxb6 axb6 17. a3 b5 18. Ncd2 Kh8 19. Nh2 Rf8 20. Nhf3 Bd7 21. c4 c6 22. 0-0 Ne3 23. Rf2 bxc4 24. Nxe5 dxe5 25. Qxe3 Bxh4 26. g3 Rxf2 27. Qxf2 Rf8 28. Qh2 Be7 29. Qxh5+ Qh7 30. Qxh7+ Kxh7 31. Nxc4 Bc5+ 32. Be3 Bxe3+ 33. Nxe3 Rf3 34. Re1 Rxg3+ 35. Kf2 Rh3 36. Rg1 Rh2+ 37. Rg2 Rh1 38. Nc4 Ra1 39. Nxe5 Ra2+ 40. Kg1 Ra1+ 41. Kh2 Be8 42. Rb2 Rxa3 43. Rb8 Bg6 44. Rc8 Bxe4 45. dxe4 Ra5 46. Nf7 Kg6 47. Nd6 Kf6 48. Rxc6 Ke6 49. Kg3 Ke5 50. Kf3 Ra4 51. Nf7+ Kd4 52. Rd6+ Kc5 53. Rd5+ Kc4 54. Ne5+ Kc3 55. Nd3 1-0

[Event "Terre degli Elimi op 4th"]
[Site "Erice"]
[Date "2013.07.24"]
[Round "1"]
[White "Groenewold, Jan Joris"]
[Black "Schlee, Ulrich"]
[Result "1-0"]
[ECO "E02"]
[WhiteElo "2175"]
[BlackElo "1802"]
[PlyCount "79"]
[EventDate "2013.07.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "ITA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. g3 Nbd7 5. Bg2 dxc4 6. Qa4 Be7 7. 0-0 0-0 8. Qxc4 c5 9. Rd1 Nb6 10. Qb3 c4 11. Qc2 Bd7 12. Nc3 Rc8 13. e4 Bc6 14. Ne5 Qc7 15. Bf4 Qd8 16. Nxc6 Rxc6 17. d5 exd5 18. exd5 Rd6 19. Bxd6 Bxd6 20. Nb5 Qd7 21. a4 a6 22. Nxd6 Qxd6 23. a5 Nbd7 24. Qxc4 Ne5 25. Qb3 h5 26. Rac1 h4 27. Qxb7 hxg3 28. hxg3 Neg4 29. Qc7 Qb4 30. Qc3 Qb8 31. d6 Nd7 32. Rc2 Qb5 33. Qc6 Qh5 34. Qxd7 Ne3 35. Rcd2 Nxd1 36. Qh3 Qxa5 37. Rxd1 Qa4 38. Qh5 Qc2 39. d7 Rd8 40. Re1 1-0

[Event "Oberhausen op"]
[Site "Oberhausen"]
[Date "2013.04.01"]
[Round "7"]
[White "Groenewold, Jan Joris"]
[Black "Coenen, Michael"]
[Result "1-0"]
[ECO "E18"]
[WhiteElo "2156"]
[BlackElo "2308"]
[PlyCount "93"]
[EventDate "2013.03.28"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 153 Extra"]
[Source "ChessBase"]
[SourceDate "2013.04.22"]
[SourceVersion "1"]
[SourceVersionDate "2013.04.22"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Be7 6. 0-0 0-0 7. Nc3 d6 8. Qc2 c5 9. e4 cxd4 10. Nxd4 Qc8 11. b3 a6 12. Bb2 Rd8 13. Qe2 Nbd7 14. Rac1 Qc7 15. Nd5 exd5 16. cxd5 Nc5 17. b4 Re8 18. bxc5 bxc5 19. Nf5 Bc8 20. Ne3 Bd7 21. Qc2 Rab8 22. Bc3 Ng4 23. Nc4 Bb5 24. Ba5 Qa7 25. h3 Bxc4 26. Qxc4 Ne5 27. Qe2 Bf6 28. f4 Nd3 29. Rc4 Nb2 30. Rc2 Bd4+ 31. Kh2 Na4 32. Qc4 Qd7 33. a3 Qb5 34. Bc7 Rb7 35. Bxd6 Qxc4 36. Rxc4 Nb2 37. Rc2 Rc8 38. e5 Rb3 39. Be7 c4 40. d6 Bb6 41. d7 Rb8 42. Rf3 Rb5 43. a4 Nxa4 44. Rxc4 Nc5 45. Rfc3 Ne6 46. Rc8+ Bd8 47. Bxd8 1-0

[Event "Oberhausen op"]
[Site "Oberhausen"]
[Date "2013.03.30"]
[Round "3"]
[White "Zaitsev, Mikhail"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B04"]
[WhiteElo "2515"]
[BlackElo "2156"]
[PlyCount "69"]
[EventDate "2013.03.28"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 153 Extra"]
[Source "ChessBase"]
[SourceDate "2013.04.22"]
[SourceVersion "1"]
[SourceVersionDate "2013.04.22"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nc3 g6 7. Be3 Bg7 8. Rc1 0-0 9. Nf3 Bg4 10. Be2 Nc6 11. d5 Bxf3 12. Bxf3 Ne5 13. b3 Nxf3+ 14. Qxf3 Nd7 15. 0-0 Qc8 16. Qe2 Ne5 17. h3 Qf5 18. Rfd1 g5 19. Qc2 Qxc2 20. Rxc2 h6 21. Nb5 a6 22. Nd4 Bf6 23. g3 Kh7 24. Kg2 Kg6 25. a4 Rac8 26. a5 Nd7 27. b4 Rc7 28. Nb3 Ne5 29. c5 Rfc8 30. f4 Nd7 31. Kf3 Kf5 32. Rdc1 Rg8 33. c6 gxf4 34. g4+ Kg6 35. cxd7 1-0

[Event "Ruhrgebiet Verbandsliga2 1112"]
[Site "Nordrheinwestfalen"]
[Date "2012.03.25"]
[Round "8"]
[White "Groenewold, Jan Joris"]
[Black "Remmler, Volker"]
[Result "0-1"]
[ECO "A53"]
[WhiteElo "2140"]
[BlackElo "2041"]
[PlyCount "102"]
[EventDate "2011.09.18"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]
[WhiteTeam "Recklinghausen Altstadt"]
[BlackTeam "Doppelbauer Brambauer"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 Nf6 2. Nf3 d6 3. c4 c6 4. Nc3 Qc7 5. e4 e5 6. d5 Be7 7. h3 0-0 8. g4 Nbd7 9. Be3 a6 10. Nd2 cxd5 11. cxd5 b5 12. Rc1 Qb8 13. g5 Ne8 14. h4 Bd8 15. Qf3 Bb6 16. Nd1 f5 17. exf5 e4 18. Qh5 Nc7 19. Bg2 Nxd5 20. Bxe4 Bb7 21. f6 N7xf6 22. gxf6 Nxf6 23. Qf5 Bxe3 24. Nxe3 Nxe4 25. Qe6+ Kh8 26. Nxe4 Re8 27. Qd7 Bxe4 28. Rg1 Ra7 29. Qg4 d5 30. Kf1 h6 31. f3 Bd3+ 32. Kf2 Rae7 33. Qd4 Bh7 34. Rc6 Qe5 35. Qxe5 Rxe5 36. Ng4 Re2+ 37. Kg3 Rxb2 38. Rd6 d4 39. Rc1 h5 40. Nf2 Bf5 41. Rc5 Rf8 42. Rcd5 Rb4 43. a3 Rb3 44. Rxd4 Bg4 45. Nxg4 Rfxf3+ 46. Kg2 Rg3+ 47. Kf2 hxg4 48. Rf4 Rgc3 49. Kg2 g3 50. Rg4 Rc2+ 51. Kh3 Rh2# 0-1

[Event "Ruhrgebiet Verbandsliga2 1112"]
[Site "Nordrheinwestfalen"]
[Date "2012.03.04"]
[Round "7.1"]
[White "Groenewold, Jan Joris"]
[Black "Hassenrueck, Helmut"]
[Result "0-1"]
[ECO "E01"]
[WhiteElo "2140"]
[BlackElo "2149"]
[PlyCount "96"]
[EventDate "2011.09.18"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]
[WhiteTeam "Recklinghausen Altstadt"]
[BlackTeam "Gladbeck SG"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 Nf6 2. Nf3 e6 3. g3 c5 4. Bg2 cxd4 5. Nxd4 d5 6. 0-0 e5 7. Nf3 Nc6 8. c4 d4 9. e4 Bc5 10. Ne1 0-0 11. Nd3 Be7 12. Nd2 Be6 13. h3 Nd7 14. f4 exf4 15. Nxf4 Nde5 16. b3 d3 17. Bb2 Bc5+ 18. Kh2 Bd4 19. Bxd4 Nxd4 20. Qh5 Qa5 21. Rf2 g6 22. Qh6 Nc2 23. Raf1 Ne3 24. Kg1 Nxf1 25. Bxf1 Rad8 26. Nh5 Nf3+ 27. Rxf3 Qxh5 28. Qxh5 gxh5 29. Kf2 f5 30. e5 Rd7 31. Bxd3 Rfd8 32. Ke2 Rd4 33. Nb1 f4 34. gxf4 Rxd3 35. Rxd3 Rxd3 36. Kxd3 Bf5+ 37. Kd4 Bxb1 38. e6 Kf8 39. a3 Bf5 40. h4 Bxe6 41. b4 Ke7 42. a4 Kf6 43. c5 Bb3 44. a5 a6 45. b5 Ke6 46. f5+ Kd7 47. c6+ bxc6 48. bxa6 Kd6 0-1

[Event "Ruhrgebiet Verbandsliga2 1112"]
[Site "Nordrheinwestfalen"]
[Date "2012.02.12"]
[Round "6.1"]
[White "Gohla, Ulf"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "E44"]
[WhiteElo "2199"]
[BlackElo "2140"]
[PlyCount "90"]
[EventDate "2011.09.18"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]
[WhiteTeam "Wattenscheid SV IV"]
[BlackTeam "Recklinghausen Altstadt"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Nge2 Bb7 6. a3 Be7 7. Ng3 c5 8. d5 d6 9. Be2 0-0 10. 0-0 Na6 11. e4 Nc7 12. b3 Nd7 13. Bb2 Bf6 14. Na4 exd5 15. exd5 b5 16. cxb5 Bxb2 17. Nxb2 Qf6 18. Nc4 Nxb5 19. Ne4 Qg6 20. Qd3 f5 21. Na5 Nd4 22. Nxb7 fxe4 23. Qd1 Ne5 24. Kh1 Rf7 25. Bh5 Qg5 26. Bxf7+ Nxf7 27. b4 Qxd5 28. bxc5 dxc5 29. Rb1 Ne5 30. Qa4 Nd3 31. Qa6 Qa2 32. Nd6 Nxf2+ 33. Rxf2 Qxb1+ 34. Rf1 Qd3 35. Qxd3 exd3 36. Rd1 Rb8 37. Kg1 Rb3 38. a4 Ne2+ 39. Kf2 Nc3 40. Rd2 c4 41. Ke3 Nb1 42. Rd1 d2+ 43. Ke4 c3 44. Kd3 Na3 45. Rf1 d1Q+ 0-1

[Event "Ruhrgebiet Verbandsliga2 1112"]
[Site "Nordrheinwestfalen"]
[Date "2012.01.08"]
[Round "5.1"]
[White "Groenewold, Jan Joris"]
[Black "Loyen, Egbert"]
[Result "0-1"]
[ECO "E90"]
[WhiteElo "2140"]
[BlackElo "2129"]
[PlyCount "64"]
[EventDate "2011.09.18"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]
[WhiteTeam "Recklinghausen Altstadt"]
[BlackTeam "Weisse Dame Borbeck"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 e5 7. d5 a5 8. Bg5 Na6 9. g4 Qe8 10. Nd2 Nd7 11. Be2 Ndc5 12. Nf1 f6 13. Be3 f5 14. gxf5 gxf5 15. exf5 Bxf5 16. Ng3 Bg6 17. a3 e4 18. 0-0 a4 19. Bg4 Qe5 20. Nxa4 Nxa4 21. Qxa4 h5 22. Be6+ Kh8 23. Qd1 Rf3 24. Re1 Raf8 25. Qd2 Nc5 26. Bxc5 dxc5 27. Re2 Kh7 28. Qe1 Qg5 29. Kh1 e3 30. Rxe3 Rxf2 31. h4 Qxh4+ 32. Kg1 Qh2# 0-1

[Event "Ruhrgebiet Verbandsliga2 1112"]
[Site "Nordrheinwestfalen"]
[Date "2011.12.11"]
[Round "4.1"]
[White "Martin, Andreas"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "A87"]
[WhiteElo "2190"]
[BlackElo "2140"]
[PlyCount "71"]
[EventDate "2011.09.18"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]
[WhiteTeam "Muelheim SC"]
[BlackTeam "Recklinghausen Altstadt"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. c4 Bg7 5. Nc3 d6 6. Nf3 0-0 7. 0-0 Qe8 8. d5 Na6 9. Nd4 Nc5 10. b4 Nce4 11. Ncb5 Qd8 12. f3 a6 13. fxe4 axb5 14. exf5 gxf5 15. cxb5 Ng4 16. h3 Ne5 17. a4 Ng6 18. Ra3 Kh8 19. Raf3 Rxa4 20. Qxa4 Bxd4+ 21. Be3 Bg7 22. b6 Ne5 23. Rf4 Bh6 24. Bd4 Rg8 25. bxc7 Qxc7 26. Qb3 Bg7 27. Kh1 Bf6 28. e4 fxe4 29. Rxe4 Bd7 30. Qe3 Qc2 31. Bxe5 dxe5 32. Rxe5 Qc7 33. Rxe7 Bxe7 34. Qd4+ Bf6 35. Rxf6 Qc1+ 36. Rf1+ 1-0

[Event "Ruhrgebiet Verbandsliga2 1112"]
[Site "Nordrheinwestfalen"]
[Date "2011.10.09"]
[Round "2.1"]
[White "Spyrou, Emmanouil"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "A83"]
[WhiteElo "2238"]
[BlackElo "2140"]
[PlyCount "76"]
[EventDate "2011.09.18"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]
[WhiteTeam "Hamm SVg"]
[BlackTeam "Recklinghausen Altstadt"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 Nc6 5. Bb5 a6 6. Ba4 b5 7. Bb3 Bb7 8. f3 e5 9. d5 Nd4 10. fxe4 Bc5 11. Nf3 d6 12. Qd3 0-0 13. 0-0-0 Qe8 14. Nxd4 Bxd4 15. Rdf1 Qg6 16. Bxf6 Rxf6 17. Rxf6 Qxf6 18. Nd1 Rf8 19. c3 Bb6 20. a4 Bc8 21. axb5 axb5 22. h3 Qg5+ 23. Qd2 Qg3 24. Re1 b4 25. Bc4 bxc3 26. bxc3 Bd7 27. Rf1 Ra8 28. Rf3 Qg6 29. Qe2 Bc5 30. Kd2 Bb5 31. Kd3 Bxc4+ 32. Kxc4 Qe8 33. Qc2 Ra3 34. Kd3 Qa8 35. Ne3 Bd4 36. Nd1 Bc5 37. Ne3 Qa6+ 38. Nc4 Bd4 0-1

[Event "Ruhrgebiet Verbandsliga2 1112"]
[Site "Nordrheinwestfalen"]
[Date "2011.09.18"]
[Round "1.1"]
[White "Groenewold, Jan Joris"]
[Black "Kummerow, Heiko"]
[Result "1/2-1/2"]
[ECO "E90"]
[WhiteElo "2140"]
[BlackElo "2287"]
[PlyCount "100"]
[EventDate "2011.09.18"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]
[WhiteTeam "Recklinghausen Altstadt"]
[BlackTeam "Recklinghausen Laeufer Ost"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 Na6 7. Bg5 c5 8. d5 Nc7 9. Bd3 e5 10. g4 Qe8 11. Nd2 Nd7 12. Qe2 Nb6 13. Bc2 Bd7 14. h4 Nc8 15. Bd3 Rb8 16. Be3 b5 17. h5 bxc4 18. Nxc4 Nb5 19. Qf3 Nxc3 20. bxc3 f5 21. gxf5 gxf5 22. h6 Bf6 23. exf5 e4 24. Bxe4 Kh8 25. Rc1 Rg8 26. Kd2 Bb5 27. Rb1 Bxc4 28. Rxb8 Qa4 29. Rc1 Ba6 30. Bd3 Bxd3 31. Kxd3 Qxa2 32. Rc2 Qa6+ 33. c4 Re8 34. Qh5 Rf8 35. Qg4 Qa1 36. Bc1 Re8 37. Qe4 Qa4 38. Qg4 Qa1 39. Qe4 Qa4 40. Re2 Rf8 41. Qe6 Qd1+ 42. Bd2 Qa1 43. Qxc8 Qd4+ 44. Kc2 Qxc4+ 45. Kd1 Qa4+ 46. Kc1 Qa1+ 47. Kc2 Qa4+ 48. Kb1 Qa1+ 49. Kc2 Qa4+ 50. Kb1 Qa1+ 1/2-1/2

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.16"]
[Round "9"]
[White "Groenewold, Jan Joris"]
[Black "Afek, Yochanan"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "2176"]
[BlackElo "2298"]
[PlyCount "58"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. f4 c5 2. Nf3 g6 3. g3 Bg7 4. Bg2 Nc6 5. d3 d5 6. 0-0 Nf6 7. Qe1 0-0 8. c3 b6 9. Na3 Bb7 10. Rb1 d4 11. b4 cxb4 12. cxb4 Nd5 13. b5 Na5 14. Nc2 Nc3 15. Rb2 Rc8 16. a4 Nxa4 17. Rb4 Rxc2 18. Rxa4 Qd7 19. Ne5 Bxe5 20. fxe5 Qxb5 21. Rxa5 bxa5 22. Bxb7 Qxb7 23. Bh6 Qd5 24. Bxf8 Kxf8 25. Qf2 a4 26. h4 a3 27. h5 gxh5 28. e6 Qxe6 29. Qxd4 Qb6 0-1

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.15"]
[Round "8"]
[White "Bedouin, Xavier"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "2410"]
[BlackElo "2176"]
[PlyCount "151"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Be7 5. Bb3 0-0 6. 0-0 d5 7. exd5 Nxd5 8. Re1 Bf6 9. h3 Be6 10. Nbd2 Nf4 11. Nc4 Ng6 12. Bd2 Bd5 13. Bc3 Re8 14. Ne3 Bxb3 15. axb3 e4 16. Bxf6 Qxf6 17. Nd5 Qxb2 18. dxe4 Rad8 19. c4 Nf4 20. Qd2 Qxd2 21. Nxd2 Ne6 22. Rf1 Ne5 23. Rxa7 c6 24. Rxb7 cxd5 25. exd5 Nc5 26. Rc7 Ned3 27. Ra1 Ra8 28. Rxa8 Rxa8 29. d6 Kf8 30. Nf3 Ne6 31. Rb7 Rd8 32. Rb6 f6 33. b4 Kf7 34. c5 Nef4 35. g3 Nd5 36. Rb7+ Kg6 37. Nd4 N3xb4 38. d7 Kf7 39. c6 Ke7 40. Nf5+ Ke6 41. Nxg7+ Kd6 42. c7 Nxc7 43. Rxb4 Rxd7 44. Nf5+ Ke5 45. Ne3 Ke6 46. Rb6+ Rd6 47. Rb7 Rd7 48. Kg2 Ne8 49. Rb4 Nd6 50. Rh4 Ne8 51. Rh6 Nd6 52. g4 Ke5 53. Rh5+ Ke6 54. Kf3 Nf7 55. h4 Rb7 56. Kg3 Ne5 57. Rh6 Ng6 58. g5 Rf7 59. Ng4 Ne7 60. Rxf6+ Rxf6 61. Nxf6 h6 62. Kg4 Kf7 63. f4 hxg5 64. hxg5 Kg6 65. Nd7 Nd5 66. Ne5+ Kg7 67. f5 Ne3+ 68. Kf4 Ng2+ 69. Ke4 Nh4 70. f6+ Kf8 71. g6 Kg8 72. Kf4 Kh8 73. Kg5 Ng2 74. Kh6 Ne1 75. g7+ Kg8 76. f7# 1-0

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.14"]
[Round "7"]
[White "De Jong, Migchiel"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "C41"]
[WhiteElo "2376"]
[BlackElo "2176"]
[PlyCount "83"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Be7 6. Nde2 0-0 7. g3 b5 8. Bg2 Bb7 9. 0-0 b4 10. Nd5 Nxd5 11. exd5 Nd7 12. a3 a5 13. Nd4 Bf6 14. Nc6 Bxc6 15. dxc6 Nc5 16. Qd5 Re8 17. axb4 axb4 18. Rxa8 Qxa8 19. Qc4 Qb8 20. Bd5 Re7 21. b3 Qb6 22. Bd2 Bc3 23. Bxc3 bxc3 24. b4 Ne6 25. Re1 Kf8 26. Qxc3 Qd4 27. Qxd4 Nxd4 28. Rxe7 Kxe7 29. c4 f6 30. h4 Kd8 31. Kg2 Kc8 32. g4 Kb8 33. Kg3 Ka7 34. Kf4 Kb6 35. h5 Nc2 36. b5 Kc5 37. h6 gxh6 38. Kf5 Nd4+ 39. Kxf6 Nxb5 40. cxb5 Kxd5 41. f4 Kc5 42. f5 1-0

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.13"]
[Round "6"]
[White "Groenewold, Jan Joris"]
[Black "Picard, Romain"]
[Result "1-0"]
[ECO "E12"]
[WhiteElo "2176"]
[BlackElo "2351"]
[PlyCount "57"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. Nf3 Bb7 4. Nc3 Nf6 5. g3 Bxf3 6. exf3 c6 7. d5 cxd5 8. cxd5 Nxd5 9. Nxd5 exd5 10. Bb5 Bb4+ 11. Kf1 0-0 12. Qxd5 Nc6 13. Kg2 Qf6 14. Rd1 Bc5 15. Rb1 h6 16. a3 a5 17. Bd2 Ne7 18. Qxd7 Rfd8 19. Qg4 Bd4 20. Bxh6 Qe5 21. a4 Ng6 22. Bg5 Rd6 23. Re1 Qc5 24. Rbc1 Qb4 25. Rc8+ Rd8 26. Rxa8 Rxa8 27. Re4 f5 28. Qxf5 Qxb2 29. Bc4+ 1-0

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.12"]
[Round "5"]
[White "Tate, Alan"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B42"]
[WhiteElo "2342"]
[BlackElo "2176"]
[PlyCount "33"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Ne7 6. 0-0 Nec6 7. c3 b6 8. Be3 d6 9. Nd2 Bb7 10. f4 Nd7 11. f5 e5 12. Ne6 fxe6 13. Qh5+ g6 14. fxg6 Nf6 15. g7+ Nxh5 16. gxh8Q Qe7 17. Bh6 1-0

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.11"]
[Round "4"]
[White "Groenewold, Jan Joris"]
[Black "Rietveld, Renze"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "2176"]
[BlackElo "2248"]
[PlyCount "105"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. f4 Nf6 2. Nf3 d5 3. g3 g6 4. Bg2 Bg7 5. d3 0-0 6. 0-0 c6 7. Qe1 Qb6+ 8. Kh1 Ng4 9. Nc3 Ne3 10. Na4 Nxg2 11. Kxg2 Qc7 12. e4 dxe4 13. dxe4 b6 14. Bd2 Nd7 15. Bc3 Nf6 16. Rd1 Bb7 17. Be5 Qc8 18. Nc3 Bh6 19. Bxf6 exf6 20. b4 Re8 21. Rf2 Bf8 22. b5 cxb5 23. Nd5 Bxd5 24. Rxd5 Qc4 25. Rd4 Qc6 26. Re2 Bc5 27. Rd3 Re7 28. e5 Rae8 29. Qc3 b4 30. Qb2 a5 31. Kh3 a4 32. g4 Rd7 33. Kg3 Rxd3 34. cxd3 fxe5 35. fxe5 Qd5 36. d4 Be7 37. Qc1 b3 38. axb3 Qxb3 39. Qc6 Rd8 40. e6 f6 41. d5 Qxd5 42. Qxa4 Ra8 43. Qc2 Ra3 44. Qe4 Qxe4 45. Rxe4 Kf8 46. Kf2 Bc5+ 47. Ke2 Ke7 48. g5 f5 49. Re5 f4 50. Nd2 Re3+ 51. Rxe3 fxe3 52. Ne4 Kxe6 53. h4 0-1

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.10"]
[Round "3"]
[White "Van Assendelft, Floris"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "C41"]
[WhiteElo "2393"]
[BlackElo "2176"]
[PlyCount "73"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Be7 6. g3 0-0 7. Bg2 Nc6 8. 0-0 Bg4 9. Nxc6 bxc6 10. f3 Be6 11. f4 Qc8 12. b3 Bh3 13. Bb2 Bxg2 14. Kxg2 Nd7 15. Qf3 Re8 16. Rad1 Bf8 17. Ne2 c5 18. c4 Qb7 19. Nc3 Nb6 20. Nd5 Nxc4 21. Bxg7 Bxg7 22. bxc4 c6 23. Ne3 Qe7 24. e5 dxe5 25. Nf5 Qf6 26. fxe5 Qxe5 27. Nxg7 Qxg7 28. Rd7 Rf8 29. Qxc6 Rab8 30. Rf2 Rb2 31. Qxc5 Rfb8 32. Qxa7 Qg4 33. Rd8+ Rxd8 34. Qxf7+ Kh8 35. Qf6+ Kg8 36. Qxd8+ Kg7 37. Qf6+ 1-0

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.09"]
[Round "2"]
[White "Groenewold, Jan Joris"]
[Black "Geurink, Jasper"]
[Result "1/2-1/2"]
[ECO "E90"]
[WhiteElo "2176"]
[BlackElo "2293"]
[PlyCount "83"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d6 5. e4 0-0 6. h3 e5 7. d5 Na6 8. Bg5 Bd7 9. Nd2 Qe8 10. g4 Kh8 11. Qe2 c6 12. Nb3 Nc7 13. Na5 Rb8 14. Be3 c5 15. Nb3 b5 16. Nd2 h5 17. Qf3 h4 18. Bg5 Nh7 19. Bxh4 Bh6 20. Bf6+ Kg8 21. h4 Bf4 22. Bg5 Nxg5 23. hxg5 Kg7 24. cxb5 Qe7 25. 0-0-0 Qxg5 26. Be2 a6 27. a4 axb5 28. Kc2 b4 29. Nb5 Bxb5 30. Bxb5 b3+ 31. Qxb3 Bxd2 32. Rxd2 Qxg4 33. f3 Qf4 34. Rdh2 Kf6 35. Qd3 Ke7 36. Qe2 Rb6 37. Rh8 Qf6 38. Rxf8 Kxf8 39. Bc4 Rb7 40. Qe3 Ra7 41. b3 Ke7 42. Be2 1/2-1/2

[Event "Groningen Atlantis IM"]
[Site "Groningen"]
[Date "2011.08.08"]
[Round "1"]
[White "Lambrechts, Koen"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "B05"]
[WhiteElo "2255"]
[BlackElo "2176"]
[PlyCount "110"]
[EventDate "2011.08.08"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[EventCategory "3"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 c6 6. exd6 exd6 7. 0-0 Be7 8. c4 Nb6 9. b3 N8d7 10. Nbd2 0-0 11. Qc2 Nf6 12. Bd3 Nbd7 13. Bb2 Bh5 14. Nh4 Re8 15. Rfe1 Bf8 16. Nf1 d5 17. Rxe8 Qxe8 18. Ng3 Bg6 19. Nxg6 hxg6 20. c5 Be7 21. b4 Nf8 22. Bc3 Ne6 23. Rb1 a6 24. a4 Nh5 25. Nxh5 gxh5 26. Re1 Bf6 27. Qe2 h4 28. Bf5 Qd7 29. Bxe6 fxe6 30. Qxe6+ Qxe6 31. Rxe6 Kf7 32. Re1 Re8 33. Rxe8 Kxe8 34. Kf1 Kf7 35. Ke2 Ke6 36. Kf3 Kf5 37. g4+ hxg3 38. fxg3 g6 39. h4 g5 40. g4+ Kg6 41. h5+ Kh6 42. Ke3 Bd8 43. Be1 Bc7 44. Kd3 Kg7 45. Bd2 Kh6 46. Kc2 Bd8 47. Kb3 Bc7 48. b5 Bd8 49. Kb4 Bc7 50. Be1 Kh7 51. Kb3 Kg7 52. Bd2 Kh6 53. Be1 Kh7 54. Bd2 Kh6 55. Be1 Kh7 1/2-1/2

[Event "Paleochora op 4th"]
[Site "Paleochora"]
[Date "2011.07.27"]
[Round "9"]
[White "Groenewold, Jan Joris"]
[Black "Faibisovich, Vadim Z"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "2176"]
[BlackElo "2409"]
[PlyCount "48"]
[EventDate "2011.07.20"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GRE"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. f4 d5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. 0-0 0-0 6. d3 c5 7. Qe1 Nc6 8. c3 Bg4 9. e4 dxe4 10. dxe4 e5 11. f5 gxf5 12. exf5 Bxf5 13. Nxe5 Nxe5 14. Rxf5 Nd3 15. Qf1 Re8 16. Bd2 c4 17. Na3 Qb6+ 18. Kh1 Ng4 19. Bd5 Qxb2 20. Nxc4 Qc2 21. Bxf7+ Kh8 22. Bxe8 Rxe8 23. Nd6 Qxd2 24. Nxe8 Qxh2# 0-1

[Event "Paleochora op 4th"]
[Site "Paleochora"]
[Date "2011.07.26"]
[Round "8"]
[White "Skembris, Spyridon"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "A88"]
[WhiteElo "2475"]
[BlackElo "2176"]
[PlyCount "62"]
[EventDate "2011.07.20"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GRE"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. c4 f5 2. Nc3 Nf6 3. Nf3 d6 4. d4 g6 5. g3 Bg7 6. Bg2 0-0 7. 0-0 Qe8 8. b3 c6 9. Ba3 Na6 10. Qd3 Rb8 11. e4 b5 12. e5 b4 13. exf6 Bxf6 14. Bc1 bxc3 15. Bh6 e5 16. dxe5 dxe5 17. Bxf8 e4 18. Qe2 Qxf8 19. Ne1 c5 20. Nc2 Nb4 21. f3 Bb7 22. fxe4 Re8 23. a3 Nxc2 24. Qxc2 Bxe4 25. Bxe4 Rxe4 26. Rae1 Bd4+ 27. Kh1 Qe7 28. Rxe4 fxe4 29. Rf4 e3 30. Re4 Qf7 31. Kg2 a5 1/2-1/2

[Event "Paleochora op 4th"]
[Site "Paleochora"]
[Date "2011.07.21"]
[Round "2"]
[White "Svetushkin, Dmitry"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "E11"]
[WhiteElo "2576"]
[BlackElo "2176"]
[PlyCount "59"]
[EventDate "2011.07.20"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GRE"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2 0-0 5. a3 Bxd2+ 6. Bxd2 d6 7. Bg5 Nbd7 8. Qc2 e5 9. e3 Re8 10. Be2 Nf8 11. 0-0-0 h6 12. Bh4 Ng6 13. Bg3 e4 14. Nd2 c6 15. Rhe1 a5 16. h3 b5 17. Bh2 Ba6 18. f3 d5 19. c5 Nh4 20. fxe4 dxe4 21. Bf1 b4 22. Bxa6 Rxa6 23. Nc4 Qd5 24. a4 Nxg2 25. Rg1 b3 26. Qe2 Nh4 27. Be5 Re6 28. Nb6 Rxb6 29. cxb6 Qd7 30. Qc4 1-0

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.23"]
[Round "8"]
[White "Sparenberg, Erik"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B41"]
[WhiteElo "2090"]
[BlackElo "2189"]
[PlyCount "63"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 138 Extra"]
[Source "ChessBase"]
[SourceDate "2010.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2010.10.29"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nc6 6. Nc3 Bb4 7. Be3 Nf6 8. Nxc6 bxc6 9. e5 Ne4 10. Qd4 f5 11. f3 Bc5 12. Qd3 Qh4+ 13. g3 Nxg3 14. hxg3 Qxg3+ 15. Kd2 Qxe5 16. f4 Bxe3+ 17. Qxe3 Qxe3+ 18. Kxe3 c5 19. Bg2 Rb8 20. Na4 d6 21. Bc6+ Bd7 22. Bxd7+ Kxd7 23. Rag1 Rbg8 24. Rg2 Ke7 25. a3 Kf6 26. Rd1 g5 27. fxg5+ Ke5 28. Kf3 f4 29. Re2+ Kf5 30. Rxd6 Rxg5 31. Rdxe6 Rg3+ 32. Kf2 1-0

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.22"]
[Round "7"]
[White "Groenewold, Jan Joris"]
[Black "Mostertman, Conrad"]
[Result "1-0"]
[ECO "A86"]
[WhiteElo "2189"]
[BlackElo "2038"]
[PlyCount "54"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 138 Extra"]
[Source "ChessBase"]
[SourceDate "2010.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2010.10.29"]
[SourceQuality "1"]

1. d4 f5 2. g3 Nf6 3. Bg2 d6 4. c4 g6 5. Nh3 Bg7 6. Nf4 e5 7. dxe5 dxe5 8. Qxd8+ Kxd8 9. Nd3 Nbd7 10. Nc3 e4 11. Nf4 Ne5 12. Be3 c6 13. 0-0-0+ Kc7 14. b3 Neg4 15. Bd4 e3 16. f3 Nf2 17. Be5+ Kb6 18. c5+ Ka6 19. Nd3 Nxd1 20. Nb4+ Ka5 21. Rxd1 Ne8 22. Rd4 Bd7 23. Nc2 b5 24. b4+ Ka6 25. Bxg7 Nxg7 26. Rxd7 Ne6 27. f4 Rac8 1-0

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.21"]
[Round "6"]
[White "Geurink, Jasper"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B10"]
[WhiteElo "2307"]
[BlackElo "2189"]
[PlyCount "71"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 138 Extra"]
[Source "ChessBase"]
[SourceDate "2010.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2010.10.29"]
[SourceQuality "1"]

1. e4 c6 2. d3 d5 3. Nd2 e5 4. Ngf3 Bd6 5. g3 Nf6 6. Bg2 0-0 7. 0-0 Re8 8. Re1 Nbd7 9. b3 Nf8 10. Bb2 Ng6 11. a3 d4 12. b4 b6 13. Nc4 Bc7 14. a4 Qe7 15. c3 dxc3 16. Bxc3 Ba6 17. Qb3 Rad8 18. d4 Nd7 19. b5 Bb7 20. bxc6 Bxc6 21. d5 Nc5 22. Qc2 Bd7 23. Bb4 Rc8 24. a5 Qf6 25. axb6 Bxb6 26. Nxb6 axb6 27. Qb1 Bb5 28. Ra3 Bc4 29. Nd2 Nd7 30. Ra7 Ngf8 31. Bh3 Red8 32. Bxf8 Nxf8 33. Bxc8 Rxc8 34. Nxc4 Rxc4 35. Ra8 Qd6 36. Rc1 1-0

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.20"]
[Round "5"]
[White "Groenewold, Jan Joris"]
[Black "Zuiderweg, Edwin"]
[Result "0-1"]
[ECO "E05"]
[WhiteElo "2189"]
[BlackElo "2033"]
[PlyCount "90"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[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. g3 d5 4. Bg2 Be7 5. c4 0-0 6. 0-0 dxc4 7. Qc2 a6 8. Qxc4 b5 9. Qc2 Bb7 10. Bd2 Nbd7 11. Ba5 Nb6 12. Nbd2 Rc8 13. b4 Ne8 14. Ng5 Bxg5 15. Bxb7 Rb8 16. Bxa6 Bxd2 17. Qxd2 Nc4 18. Qc3 Nxa5 19. bxa5 Qd6 20. a4 Qxa6 21. axb5 Rxb5 22. Qc4 c6 23. Rfc1 Nf6 24. Qxc6 Qxc6 25. Rxc6 Ra8 26. a6 Kf8 27. Kg2 Nd5 28. e4 Nb4 29. Rc4 Rb6 30. a7 Na6 31. Rac1 Rxa7 32. Rc8+ Ke7 33. Rh8 h6 34. Rcc8 Kf6 35. g4 Kg6 36. h4 f5 37. gxf5+ exf5 38. e5 Rd7 39. Rc4 Nc7 40. Rf8 Ne6 41. h5+ Kxh5 42. Rxf5+ Kg4 43. Rf3 Nf4+ 44. Rxf4+ Kxf4 45. e6 Re7 0-1

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.19"]
[Round "4"]
[White "Slagter, Ruben"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B00"]
[WhiteElo "2069"]
[BlackElo "2189"]
[PlyCount "75"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 138 Extra"]
[Source "ChessBase"]
[SourceDate "2010.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2010.10.29"]
[SourceQuality "1"]

1. e4 b6 2. d4 Bb7 3. Bd3 e6 4. Nf3 d6 5. 0-0 Nd7 6. c4 e5 7. d5 Be7 8. Nc3 Ngf6 9. h3 0-0 10. Be3 a5 11. a3 Ne8 12. b4 g6 13. g4 Ng7 14. Bh6 Qe8 15. Kh2 Bc8 16. Ne2 Kh8 17. Ng3 Nf6 18. Qe2 Ng8 19. Be3 Bd8 20. c5 h5 21. gxh5 f5 22. exf5 Nxf5 23. hxg6 Nxe3 24. fxe3 axb4 25. Nh5 Bf6 26. Ng5 e4 27. Rxf6 Nxf6 28. g7+ Kg8 29. gxf8Q+ Kxf8 30. Ne6+ Bxe6 31. Nxf6 exd3 32. Qxd3 Qe7 33. dxe6 Rxa3 34. Qf5 Rxa1 35. Nd5+ Ke8 36. Nxe7 Kxe7 37. Qf7+ Kd8 38. Qd7# 1-0

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.18"]
[Round "3"]
[White "Groenewold, Jan Joris"]
[Black "Boulan, Laura"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2189"]
[BlackElo "2022"]
[PlyCount "71"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 138 Extra"]
[Source "ChessBase"]
[SourceDate "2010.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2010.10.29"]
[SourceQuality "1"]

1. f4 d6 2. e4 d5 3. exd5 c6 4. dxc6 Nxc6 5. Nf3 Nf6 6. d4 Bg4 7. c3 Qa5 8. Nbd2 Rd8 9. Qb3 Qc7 10. Bc4 e6 11. Ne5 Bh5 12. Qa4 Bd6 13. 0-0 0-0 14. Ndf3 Nd5 15. Bd3 f6 16. Nxc6 bxc6 17. Qc2 Nxf4 18. Bxh7+ Kh8 19. Bxf4 Bxf4 20. Bg6 Bg4 21. Qf2 Bxf3 22. Qxf3 Bh6 23. Rae1 Qd6 24. Qe4 e5 25. dxe5 Qc5+ 26. Kh1 fxe5 27. Qg4 Qb5 28. Bf5 Rf6 29. b3 Bf4 30. c4 Qb4 31. a3 Qxb3 32. Rxf4 exf4 33. Qh5+ Kg8 34. Re8+ Rxe8 35. Qxe8+ Rf8 36. Be6+ 1-0

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.17"]
[Round "2"]
[White "Van den Berg, Imme Pieter"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "A85"]
[WhiteElo "1982"]
[BlackElo "2189"]
[PlyCount "54"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 138 Extra"]
[Source "ChessBase"]
[SourceDate "2010.10.29"]
[SourceVersion "1"]
[SourceVersionDate "2010.10.29"]
[SourceQuality "1"]

1. Nf3 d6 2. d4 f5 3. c4 Nf6 4. Nc3 c6 5. Qc2 g6 6. e4 fxe4 7. Nxe4 Bg7 8. Bd3 Na6 9. Bd2 Qb6 10. c5 Qc7 11. cxd6 exd6 12. Bf4 Nxe4 13. Bxe4 0-0 14. Bd2 d5 15. Bd3 Qe7+ 16. Ne5 Nb4 17. Bxb4 Qxb4+ 18. Qc3 Qxc3+ 19. bxc3 Bxe5 20. dxe5 Bf5 21. Kd2 Bxd3 22. Kxd3 Rxf2 23. Rae1 Re8 24. Kd4 b6 25. Rhf1 Rd2+ 26. Ke3 Rxg2 27. Kf3 Rg5 0-1

[Event "Groningen Atlantis-B"]
[Site "Groningen"]
[Date "2010.08.16"]
[Round "1"]
[White "Groenewold, Jan Joris"]
[Black "Ten Vergert, Paul"]
[Result "1-0"]
[ECO "E90"]
[WhiteElo "2189"]
[BlackElo "2117"]
[PlyCount "75"]
[EventDate "2010.08.16"]
[EventType "tourn"]
[EventRounds "9"]
[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 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 e6 7. d5 Nh5 8. Nh2 a5 9. g3 Na6 10. Be2 Nf6 11. g4 Nc5 12. Qc2 Bd7 13. Be3 Qe7 14. 0-0-0 a4 15. h4 a3 16. b3 Ne8 17. h5 g5 18. h6 Bh8 19. Nf3 f6 20. Rdg1 Qd8 21. Rh5 Rf7 22. Nd2 Na6 23. Nf3 Nb4 24. Qd2 c5 25. Ne1 Nc7 26. Nc2 Nxc2 27. Qxc2 Na6 28. f3 Nb4 29. Qd2 Qa5 30. Kb1 Qd8 31. Bf1 Ra6 32. Nd1 Kf8 33. Nf2 Ra8 34. Nd3 Nxd3 35. Bxd3 Be8 36. Kc2 b6 37. Rd1 Rb7 38. f4 1-0

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.30"]
[Round "9"]
[White "Groenewold, Jan Joris"]
[Black "Berkovich, Mark A"]
[Result "1/2-1/2"]
[ECO "D97"]
[WhiteElo "2145"]
[BlackElo "2406"]
[PlyCount "46"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. Qb3 dxc4 6. Qxc4 0-0 7. Bf4 c6 8. e4 b5 9. Qd3 Qa5 10. Nd2 Be6 11. Be2 Re8 12. 0-0 Nbd7 13. Qc2 Rac8 14. a4 Nf8 15. Nf3 Bg4 16. b4 Qb6 17. Be3 Qc7 18. Rac1 Red8 19. Rfd1 Ne8 20. e5 Qb7 21. h3 Bf5 22. Qb2 Nc7 23. g4 Bd7 1/2-1/2

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.29"]
[Round "8"]
[White "Racherbaeumer, Marcel"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "C36"]
[WhiteElo "2301"]
[BlackElo "2145"]
[PlyCount "80"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. e4 e5 2. f4 exf4 3. Nf3 Ne7 4. Bc4 d5 5. exd5 Nxd5 6. Bxd5 Qxd5 7. Nc3 Qd8 8. d4 Be7 9. Bxf4 0-0 10. 0-0 Bg4 11. Qd2 Nc6 12. d5 Bc5+ 13. Kh1 Ne7 14. Ne4 Qxd5 15. Qxd5 Nxd5 16. Nxc5 Nxf4 17. Ne5 Ne6 18. Ncd7 Rfd8 19. Nf6+ gxf6 20. Nxg4 Rd2 21. Nxf6+ Kg7 22. Nh5+ Kg8 23. Rf3 Rad8 24. Raf1 Rd1 25. Nf6+ Kh8 26. Kg1 R8d2 27. Rg3 Ng7 28. Rh3 h5 29. Rc3 Rxf1+ 30. Kxf1 Rd6 31. Ne4 Re6 32. Nc5 Rf6+ 33. Ke2 Rb6 34. b3 Kh7 35. Nd7 Re6+ 36. Kf3 Kh6 37. Rxc7 Nf5 38. Rc4 b5 39. Rf4 Kg5 40. h4+ Nxh4+ 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.28"]
[Round "7"]
[White "Lyell, Mark"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "C34"]
[WhiteElo "2245"]
[BlackElo "2145"]
[PlyCount "76"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. e4 e5 2. f4 exf4 3. Nf3 Ne7 4. Nc3 Ng6 5. Bc4 Be7 6. 0-0 d6 7. d3 Be6 8. Bxe6 fxe6 9. Nd4 Qd7 10. Qg4 e5 11. Nf5 Bf6 12. g3 fxg3 13. hxg3 Nc6 14. Nxg7+ Bxg7 15. Qxd7+ Kxd7 16. Rf7+ Nge7 17. Rxg7 Rag8 18. Rxg8 Rxg8 19. Ne2 Nb4 20. Bd2 Nxc2 21. Rc1 Nd4 22. Nxd4 exd4 23. Kg2 Nc6 24. Rh1 Rg7 25. Bh6 Rf7 26. Rd1 Ne5 27. Bf4 c5 28. Bxe5 dxe5 29. Rh1 b5 30. b3 c4 31. bxc4 bxc4 32. dxc4 Kc6 33. Rh5 d3 34. Rh1 Kc5 35. Rc1 d2 36. Rd1 Rd7 37. Kf2 Kxc4 38. Ke2 Kc3 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.27"]
[Round "6"]
[White "Groenewold, Jan Joris"]
[Black "Piasetski, Leon David"]
[Result "1/2-1/2"]
[ECO "E90"]
[WhiteElo "2145"]
[BlackElo "2269"]
[PlyCount "74"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 e5 7. d5 a5 8. Bg5 Qe8 9. g4 Na6 10. Nd2 Kh8 11. Bd3 Bd7 12. Qf3 Nb4 13. Bb1 Ng8 14. a3 f6 15. Be3 f5 16. axb4 axb4 17. Rxa8 Qxa8 18. gxf5 bxc3 19. bxc3 Qc8 20. Rg1 gxf5 21. exf5 Bxf5 22. Bxf5 Qxf5 23. Qxf5 Rxf5 24. c5 Ne7 25. c4 Rh5 26. cxd6 cxd6 27. Ke2 Nf5 28. Ra1 Bh6 29. Bxh6 Rxh6 30. Ra8+ Kg7 31. Ra7 Rxh3 32. Rxb7+ Kg6 33. Ne4 Rh4 34. Kd3 Rh3+ 35. Kd2 Rh4 36. Kd3 Rh3+ 37. Kd2 Rh4 1/2-1/2

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.26"]
[Round "5"]
[White "Groenewold, Jan Joris"]
[Black "Ten Vergert, Paul"]
[Result "1-0"]
[ECO "B12"]
[WhiteElo "2145"]
[BlackElo "2071"]
[PlyCount "55"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. d4 Na6 2. e4 c6 3. Nf3 g6 4. Be3 Bg7 5. h3 Nf6 6. Nfd2 Nc7 7. c4 0-0 8. Nc3 d6 9. g4 e5 10. d5 c5 11. Qf3 Bd7 12. Be2 a6 13. Qg2 b5 14. g5 Nfe8 15. h4 f5 16. gxf6 Bxf6 17. Nf3 b4 18. Nb1 Bg7 19. h5 gxh5 20. Rxh5 Nf6 21. Rg5 Rf7 22. Nbd2 Nce8 23. 0-0-0 Ra7 24. Rh1 b3 25. a3 Bc8 26. Rg3 Rfc7 27. Ng5 h6 28. Rxh6 1-0

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.24"]
[Round "4"]
[White "Thompson, Ian D"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "A85"]
[WhiteElo "2266"]
[BlackElo "2145"]
[PlyCount "86"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. Nf3 f5 2. d4 Nf6 3. Bg5 d5 4. c4 e6 5. Nc3 c6 6. e3 Nbd7 7. Bd3 Be7 8. cxd5 cxd5 9. Rc1 a6 10. 0-0 h6 11. Bf4 0-0 12. Na4 Qe8 13. Ne5 Nxe5 14. Bxe5 Nd7 15. Bc7 b5 16. Nb6 Nxb6 17. Bxb6 Rf6 18. Bc5 Bd8 19. Bd6 Bd7 20. Qb3 a5 21. Rc2 h5 22. Rfc1 h4 23. f4 b4 24. Be2 Ba4 25. Qd3 Bxc2 26. Qxc2 Qd7 27. Bc5 Be7 28. Qd1 Rff8 29. Qf1 Rfc8 30. Bb5 Qd8 31. Qd1 g6 32. Qa4 Rc7 33. Kf2 Qf8 34. Bc6 Rb8 35. Bb5 Bxc5 36. dxc5 Rxc5 37. Rxc5 Qxc5 38. Bd7 Kf7 39. Qd1 Rd8 40. Ba4 d4 41. Ke1 Rd6 42. Qf3 Qc1+ 43. Kf2 dxe3+ 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.23"]
[Round "3"]
[White "Jellema, Yme Jan"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "2193"]
[BlackElo "2145"]
[PlyCount "112"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Bd7 5. Nf3 Qc8 6. Be3 Nc6 7. d5 Nd8 8. Bd4 f6 9. Bb5 c6 10. Ba4 c5 11. Bxd7+ Qxd7 12. Be3 Nh6 13. h3 f5 14. e5 b5 15. a3 0-0 16. 0-0 a6 17. Qd2 Nb7 18. b3 Rfc8 19. Ne2 Qc7 20. Ng5 Nd8 21. Rfe1 Nhf7 22. Nxf7 Nxf7 23. e6 Nh6 24. c3 Kh8 25. Kh1 Qb7 26. Rg1 Ng8 27. g4 fxg4 28. hxg4 Nf6 29. Rad1 b4 30. axb4 cxb4 31. c4 a5 32. f5 a4 33. fxg6 axb3 34. Bh6 Rxc4 35. Qg5 Rg8 36. Nf4 Bxh6 37. Qxh6 Rg7 38. Rg2 b2 39. Rxb2 Nxg4 40. Qg5 Ne3 41. Rd3 Qa8 42. Rf2 Qa1+ 43. Kh2 Qe1 44. Ra2 Rc2+ 45. Rxc2 Nxc2 46. Qf5 Qe5 47. Qxe5 dxe5 48. d6 exd6 49. Rxd6 hxg6 50. e7 Rxe7 51. Nxg6+ Kg7 52. Nxe7 b3 53. Nf5+ Kf7 54. Rb6 Nd4 55. Nxd4 exd4 56. Kg3 Kg8 1-0

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.22"]
[Round "2"]
[White "Groenewold, Jan Joris"]
[Black "Genova, Liubka"]
[Result "0-1"]
[ECO "A40"]
[WhiteElo "2145"]
[BlackElo "2263"]
[PlyCount "82"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. d4 g6 2. Nf3 Bg7 3. c4 c5 4. d5 d6 5. g3 e6 6. dxe6 Bxe6 7. Na3 Nf6 8. Bg2 0-0 9. 0-0 h6 10. Bf4 d5 11. Nb5 Na6 12. Qc1 Kh7 13. Rd1 Qb6 14. a4 Rfd8 15. Ne5 dxc4 16. Rxd8 Rxd8 17. Nxc4 Bxc4 18. Qxc4 Rd7 19. Bh3 Rd5 20. e4 Rh5 21. Bg2 Ng4 22. Rd1 Qf6 23. Qe2 Ne5 24. Bc1 c4 25. f4 Nd3 26. e5 Qd8 27. Bf3 Rf5 28. Be4 Nac5 29. g4 Nxc1 30. Qf3 Qb6 31. gxf5 Nxe4+ 32. Kg2 Nd3 33. Qxe4 Qf2+ 34. Kh1 Qc2 35. fxg6+ fxg6 36. Rxd3 cxd3 37. Qd4 d2 38. Nc3 Qxb2 39. Qd3 Qxc3 40. Qxc3 d1Q+ 41. Kg2 Qxa4 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2009.12.21"]
[Round "1"]
[White "Pruijssers, Roeland"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "C41"]
[WhiteElo "2413"]
[BlackElo "2145"]
[PlyCount "71"]
[EventDate "2009.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 134 Extra"]
[Source "ChessBase"]
[SourceDate "2010.03.03"]
[SourceVersion "1"]
[SourceVersionDate "2010.03.03"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Be7 6. g3 0-0 7. Bg2 Re8 8. 0-0 Bf8 9. b3 Nc6 10. Nxc6 bxc6 11. Bb2 Rb8 12. Re1 Bd7 13. h3 Qc8 14. Kh2 h6 15. f4 d5 16. e5 Nh7 17. Qd4 Qa6 18. Na4 Rb4 19. Qf2 c5 20. Nxc5 Qb6 21. Nd3 Qxf2 22. Nxf2 Be6 23. Nd3 Rbb8 24. g4 c6 25. f5 Bc8 26. Rac1 Rd8 27. Bd4 a5 28. a4 h5 29. Re3 hxg4 30. hxg4 Ng5 31. Kg3 Ba6 32. Kf4 Ne4 33. Bxe4 dxe4 34. Kxe4 Bxd3+ 35. Rxd3 c5 36. Bc3 1-0

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.11"]
[Round "9"]
[White "Groenewold, Jan Joris"]
[Black "Knol, Geon"]
[Result "1-0"]
[ECO "B27"]
[WhiteElo "2117"]
[BlackElo "2070"]
[PlyCount "99"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. d4 b6 2. e4 Bb7 3. Bd3 e6 4. Nf3 c5 5. 0-0 cxd4 6. Nxd4 Nc6 7. Nxc6 Bxc6 8. f4 Bc5+ 9. Kh1 Nf6 10. Nd2 h5 11. Qf3 d5 12. e5 Ng4 13. Qg3 g6 14. Nb3 Nh6 15. Nxc5 bxc5 16. f5 h4 17. Qf2 Nxf5 18. Qxc5 Rc8 19. Kg1 h3 20. g4 Qh4 21. gxf5 gxf5 22. Rf4 Qe1+ 23. Rf1 Rg8+ 24. Kh1 Qh4 25. Rg1 Rg4 26. Bb5 Rxg1+ 27. Kxg1 Qg5+ 28. Kf2 Qg2+ 29. Ke1 Qh1+ 30. Kd2 Qxh2+ 31. Kd1 Qh1+ 32. Kd2 Qg2+ 33. Kd1 h2 34. Bxc6+ Rxc6 35. Qxc6+ Kf8 36. Bh6+ Kg8 37. Qe8+ Kh7 38. Qxf7+ Kxh6 39. Qf8+ Kh5 40. Qh8+ Kg4 41. Qg7+ Kf3 42. Qxg2+ Kxg2 43. Ke2 d4 44. b4 f4 45. Rf1 f3+ 46. Ke1 Kg3 47. b5 Kf4 48. Kf2 Kxe5 49. Kxf3 Kd5 50. Rh1 1-0

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.10"]
[Round "8"]
[White "Kroencke, Manfred"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "B30"]
[WhiteElo "2121"]
[BlackElo "2117"]
[PlyCount "28"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 Na5 4. 0-0 a6 5. Be2 e6 6. d4 cxd4 7. Nxd4 Qc7 8. c4 Nf6 9. Qd3 b6 10. Be3 Bb7 11. Nd2 Bb4 12. f3 Nc6 13. Nxc6 Qxc6 14. Rfd1 0-0 1/2-1/2

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.09"]
[Round "7"]
[White "Groenewold, Jan Joris"]
[Black "Mostertman, Milan"]
[Result "1/2-1/2"]
[ECO "E11"]
[WhiteElo "2117"]
[BlackElo "2119"]
[PlyCount "88"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ 4. Bd2 Bxd2+ 5. Nbxd2 d5 6. g3 0-0 7. Bg2 Qe7 8. 0-0 Rd8 9. Qc2 c6 10. Rfd1 Nbd7 11. e4 dxe4 12. Nxe4 Nxe4 13. Qxe4 Nf6 14. Qe2 Bd7 15. Ne5 Rac8 16. Rac1 h6 17. Rc3 b6 18. Ra3 Be8 19. Re3 Qc7 20. c5 b5 21. g4 Nd5 22. Rg3 Nf4 23. Qe3 Nxg2 24. Kxg2 f6 25. Nf3 e5 26. h4 exd4 27. Rxd4 Rxd4 28. Nxd4 Bf7 29. g5 Re8 30. Qc1 Bd5+ 31. Kf1 Qe5 32. Re3 Qb8 33. gxf6 Rxe3 34. Qxe3 gxf6 35. Nxc6 Bc4+ 36. Kg1 Qb7 37. Qe8+ Kg7 38. Ne7 Qe4 39. Qd7 Qe1+ 40. Kg2 Bf1+ 41. Kg3 Qe5+ 42. Kf3 Qe2+ 43. Kg3 Qe5+ 44. Kf3 Qe2+ 1/2-1/2

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.08"]
[Round "6"]
[White "Hoeksema, Hendrik Pieter"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "A81"]
[WhiteElo "2309"]
[BlackElo "2117"]
[PlyCount "64"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. Nf3 f5 2. d4 Nf6 3. g3 g6 4. Bg2 Bg7 5. 0-0 d6 6. b3 Ne4 7. Bb2 0-0 8. Nbd2 d5 9. c4 Be6 10. cxd5 Bxd5 11. Nc4 Nd7 12. Qc2 c6 13. Rad1 Qe8 14. Nce5 Nd6 15. Nd3 h6 16. Nf4 Nf6 17. Ne5 Bf7 18. Nxf7 Qxf7 19. Nd3 Nd5 20. e3 g5 21. Rfe1 Ne4 22. f3 Nd6 23. e4 fxe4 24. fxe4 Nb6 25. Nc5 e5 26. dxe5 Ne8 27. e6 Qe7 28. e5 Nc7 29. Nxb7 Nxe6 30. Nd6 Nd5 31. Qxc6 Ndc7 32. Qc2 Rf1+ 1-0

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.07"]
[Round "5"]
[White "Hummel, Erik Jan"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "C55"]
[WhiteElo "2236"]
[BlackElo "2117"]
[PlyCount "78"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Be7 5. 0-0 d6 6. Re1 0-0 7. Nbd2 a6 8. a3 b5 9. Ba2 Bg4 10. h3 Bh5 11. c3 Rb8 12. Nf1 Nd7 13. Ng3 Bg6 14. d4 Bf6 15. Be3 Re8 16. d5 Ne7 17. c4 h5 18. h4 Nc8 19. Ng5 Be7 20. Nxh5 Nc5 21. Bxc5 Bxg5 22. Qg4 dxc5 23. hxg5 Nd6 24. cxb5 axb5 25. Rac1 Nxe4 26. Rxe4 Bxe4 27. Rc3 Bg6 28. Rh3 Kf8 29. Qh4 Ke7 30. Re3 Qd6 31. f4 Bxh5 32. Qxh5 e4 33. Rxe4+ Kd8 34. Qe2 Rxe4 35. Qxe4 Kc8 36. Qf5+ Kb7 37. a4 c4 38. g3 Re8 39. Bb1 Re2 0-1

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.06"]
[Round "4"]
[White "Groenewold, Jan Joris"]
[Black "Bijlsma, Nick"]
[Result "1-0"]
[ECO "A04"]
[WhiteElo "2117"]
[BlackElo "1982"]
[PlyCount "127"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. Nf3 c5 2. e3 Nf6 3. b3 g6 4. Ba3 d6 5. Bb5+ Nbd7 6. 0-0 Bg7 7. Re1 0-0 8. d4 Qc7 9. c3 a6 10. Bf1 b5 11. Nbd2 Bb7 12. e4 e5 13. Bb2 Rfe8 14. d5 Nb6 15. a4 bxa4 16. bxa4 Qe7 17. a5 Nbd7 18. Nc4 Nh5 19. Bc1 Rab8 20. Rb1 Bf8 21. Re2 Ba8 22. Reb2 Rxb2 23. Rxb2 Rb8 24. Rxb8 Nxb8 25. Nb6 Bb7 26. Qb3 h6 27. Qb1 Kh7 28. g3 Qc7 29. Bh3 Nf6 30. Nd2 Nbd7 31. Ndc4 Be7 32. Qd3 Nxb6 33. Nxb6 Bd8 34. Qe3 Ng8 35. f4 Qe7 36. Nc4 f6 37. Be6 g5 38. Qe2 Bc7 39. Qh5 Qg7 40. fxg5 fxg5 41. Qe8 Ne7 42. Bf7 Ng6 43. Qd7 Nh8 44. Qf5+ Ng6 45. Qd7 Nh8 46. Qf5+ Ng6 47. Ne3 Bxa5 48. Ng4 Bd8 49. Qd7 Nh8 50. Qf5+ Ng6 51. h4 h5 52. Nf2 Be7 53. Bxg6+ Qxg6 54. Qd7 Qg7 55. Qxb7 gxh4 56. g4 hxg4 57. Qd7 g3 58. Nh3 Bf6 59. Qf5+ Qg6 60. Ng5+ Bxg5 61. Bxg5 Qxf5 62. exf5 h3 63. Be7 e4 64. Bxd6 1-0

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.05"]
[Round "3"]
[White "Klinkhammer, Johan"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "A43"]
[WhiteElo "2046"]
[BlackElo "2117"]
[PlyCount "17"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. d4 c5 2. d5 f5 3. Nc3 Nf6 4. f3 d6 5. e4 e5 6. dxe6 Bxe6 7. exf5 Bxf5 8. Bd3 Be6 9. Qe2 1/2-1/2

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.04"]
[Round "2"]
[White "Groenewold, Jan Joris"]
[Black "Balje, Jan"]
[Result "1/2-1/2"]
[ECO "A02"]
[WhiteElo "2117"]
[BlackElo "2202"]
[PlyCount "66"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. f4 e5 2. fxe5 Nc6 3. Nf3 d6 4. exd6 Bxd6 5. d4 Bg4 6. Be3 Qe7 7. Bf2 f5 8. c3 Nf6 9. Qb3 0-0-0 10. Nbd2 h6 11. 0-0-0 Ne4 12. Bg1 Nxd2 13. Nxd2 Rde8 14. d5 Ne5 15. Nf3 Nd7 16. Qa4 a6 17. b4 Nb6 18. Qb3 Bf4+ 19. Kb2 Be3 20. h3 Bh5 21. Bh2 f4 22. g3 g5 23. Bg2 Bf7 24. gxf4 gxf4 25. Ne1 Rd8 26. Nc2 Rhg8 27. Bf3 Rg5 28. Nxe3 fxe3 29. d6 cxd6 30. Qc2 Bg6 31. Qb3 Bf7 32. Qc2 Bg6 33. Qb3 Bf7 1/2-1/2

[Event "Groningen-B"]
[Site "Groningen"]
[Date "2009.07.03"]
[Round "1"]
[White "Van der Marel, Bert"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "D32"]
[WhiteElo "2226"]
[BlackElo "2117"]
[PlyCount "62"]
[EventDate "2009.07.03"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 131 Extra"]
[Source "ChessBase"]
[SourceDate "2009.09.03"]
[SourceVersion "2"]
[SourceVersionDate "2009.09.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 c5 5. dxc5 Bxc5 6. Nc3 a6 7. e3 Nc6 8. Be2 0-0 9. 0-0 d5 10. cxd5 exd5 11. Rc1 Ba7 12. a3 Ne4 13. Be1 Be6 14. Nxe4 dxe4 15. Qxd8 Rfxd8 16. Ng5 Bd5 17. Bc4 Bxc4 18. Rxc4 f5 19. Bc3 Rd6 20. Bb4 Nxb4 21. axb4 h6 22. Nh3 Rad8 23. g3 g5 24. Rfc1 Rd1+ 25. Rxd1 Rxd1+ 26. Kg2 Rd7 27. Kf1 Kf7 28. Ke1 Bb8 29. b5 a5 30. b4 a4 31. Rc8 Bd6 0-1

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.24"]
[Round "8"]
[White "Tate, Alan"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B42"]
[WhiteElo "2144"]
[BlackElo "2106"]
[PlyCount "97"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Ne7 6. 0-0 Nec6 7. Nb3 d6 8. a4 b6 9. Be3 Qc7 10. N1d2 Nd7 11. f4 Be7 12. Kh1 Bb7 13. c3 0-0 14. Rf3 e5 15. f5 Nf6 16. Rg3 Kh8 17. Nc4 b5 18. Nb6 Rab8 19. axb5 axb5 20. Nd5 Qd8 21. Rh3 g6 22. Qf3 Ra8 23. Rf1 Rg8 24. Nxe7 Nxe7 25. Bg5 Nxf5 26. Rh6 Ra2 27. Qh3 Kg7 28. Rxf5 gxf5 29. Bxf6+ Qxf6 30. Rxf6 Kxf6 31. Qxf5+ Ke7 32. Qf2 Rg4 33. Bb1 Ra6 34. Qe2 Rf4 35. h3 Bc6 36. Kh2 Ra8 37. Bd3 Ra2 38. Bb1 Ra8 39. Nd2 h5 40. Bd3 Ra2 41. g3 Rf6 42. Nf1 d5 43. exd5 Bxd5 44. Qxe5+ Be6 45. Qe2 Ra1 46. Ne3 Kf8 47. Bxb5 Bc8 48. Bc4 h4 49. g4 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.23"]
[Round "7"]
[White "Groenewold, Jan Joris"]
[Black "Jellema, Yme Jan"]
[Result "0-1"]
[ECO "A06"]
[WhiteElo "2106"]
[BlackElo "2129"]
[PlyCount "68"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. Nf3 Nf6 2. b3 d5 3. Bb2 Bg4 4. e3 e6 5. Be2 Nbd7 6. d3 Bd6 7. h3 Bxf3 8. Bxf3 0-0 9. g4 Ne5 10. Bg2 c5 11. Nd2 Nc6 12. Qe2 Rc8 13. a3 b5 14. 0-0 d4 15. c4 dxc3 16. Bxc3 Be5 17. Rfc1 Nd5 18. Bxe5 Nxe5 19. Ne4 Qb6 20. Rc2 b4 21. a4 f5 22. gxf5 exf5 23. Ng5 Nc3 24. Rxc3 bxc3 25. Bd5+ Kh8 26. f4 Qg6 27. Kf2 Rcd8 28. Ne6 Nxd3+ 29. Kf1 Rxd5 30. Nxf8 Qe8 31. Rd1 Qe4 32. Rxd3 Qxd3 33. Qxd3 Rxd3 34. Ke2 Rd6 0-1

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.22"]
[Round "6"]
[White "Humphrey, Jonathan"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "C77"]
[WhiteElo "2330"]
[BlackElo "2106"]
[PlyCount "61"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 b5 6. Bb3 Bc5 7. a4 Rb8 8. 0-0 d6 9. h3 Qe7 10. axb5 axb5 11. c3 Bb6 12. Na3 Na5 13. Ba2 c6 14. b4 Nb7 15. c4 Bd7 16. Re1 0-0 17. Bb2 Ra8 18. d4 Rfd8 19. cxb5 cxb5 20. dxe5 dxe5 21. Nxe5 Be8 22. Nd3 Rxa3 23. Bxa3 Bd4 24. Rc1 Nxe4 25. Qf3 Nbd6 26. Bd5 Qa7 27. Rxe4 Nxe4 28. Qxe4 Bxf2+ 29. Nxf2 Qxa3 30. Re1 Rxd5 31. Qxe8# 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.21"]
[Round "5"]
[White "Groenewold, Jan Joris"]
[Black "Kuipers, Stefan"]
[Result "0-1"]
[ECO "D30"]
[WhiteElo "2106"]
[BlackElo "2292"]
[PlyCount "134"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Qc2 dxc4 5. Qxc4 b5 6. Qb3 e6 7. g3 Bb7 8. Bg2 Nbd7 9. 0-0 a6 10. Rd1 c5 11. Nc3 c4 12. Qc2 Be7 13. e4 b4 14. e5 bxc3 15. exf6 Bxf6 16. bxc3 Qa5 17. Rb1 Bc6 18. Nd2 Bxg2 19. Kxg2 0-0 20. f3 Nb6 21. Ne4 Nd5 22. Bd2 Rfb8 23. Rxb8+ Rxb8 24. Rb1 Rxb1 25. Qxb1 Qb5 26. Qxb5 axb5 27. Kf1 Be7 28. Ke2 Kf8 29. Kd1 Ke8 30. Kc2 Kd7 31. Be1 f5 32. Nf2 h5 33. Nd1 Bd6 34. Bf2 h4 35. Nb2 Nb6 36. Nd1 hxg3 37. hxg3 Nd5 38. Nb2 Ba3 39. Nd1 Ke7 40. Ne3 Nb6 41. g4 Kf6 42. gxf5 exf5 43. Bg3 Ke6 44. Bh4 Bd6 45. Bg5 Nd5 46. Nxd5 Kxd5 47. Kd2 Ke6 48. Ke2 Kf7 49. Bd8 Bf4 50. Bb6 Ke6 51. Bc5 g5 52. Bb4 Kd5 53. Kf2 g4 54. Kg2 Bc7 55. a3 Bb8 56. Kf2 Bc7 57. Kg2 Ke6 58. Bc5 Kf6 59. Kf2 Bb8 60. Kg2 Kg5 61. Be7+ Kf4 62. fxg4 fxg4 63. Bh4 Ke4 64. Bg3 Ba7 65. Bf2 Bb6 66. Kg3 Kf5 67. Kg2 Bd8 0-1

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.20"]
[Round "4"]
[White "Pruijssers, Roeland"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "C61"]
[WhiteElo "2458"]
[BlackElo "2106"]
[PlyCount "53"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 exd4 5. 0-0 c6 6. Bc4 Nf6 7. Re1 d6 8. c3 Ng4 9. h3 Ne5 10. Bf1 d3 11. Re3 Be7 12. f4 Nc4 13. Rf3 Qb6+ 14. Kh1 f5 15. exf5 Bxf5 16. b3 d5 17. bxc4 dxc4 18. Ba3 Bxa3 19. Nxa3 Qc5 20. Re3+ Kd7 21. Re5 Qxa3 22. Rxf5 Rae8 23. Qg4 Kd8 24. Rf7 Re7 25. Qxg7 Rhe8 26. Qd4+ Kc7 27. Qxc4 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.19"]
[Round "3"]
[White "Groenewold, Jan Joris"]
[Black "Prasanna Raghuram, Rao"]
[Result "1-0"]
[ECO "E04"]
[WhiteElo "2106"]
[BlackElo "2311"]
[PlyCount "89"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 e6 3. c4 d5 4. g3 dxc4 5. Bg2 Nc6 6. Qa4 Bb4+ 7. Bd2 Nd5 8. Bxb4 Ndxb4 9. a3 b5 10. Qd1 Nd5 11. e4 Nf6 12. Nc3 Rb8 13. 0-0 0-0 14. e5 Nd5 15. Ne4 Nde7 16. Qd2 Bb7 17. Rfd1 Nf5 18. Qf4 Nce7 19. Nc5 Bd5 20. Qd2 Nc6 21. g4 Nfe7 22. Qe3 Ng6 23. Rd2 Nce7 24. Ne1 Rb6 25. f4 f6 26. Rf2 fxe5 27. dxe5 Bxg2 28. Nxg2 Nd5 29. Qg3 Qe7 30. Ne4 b4 31. h4 bxa3 32. Rxa3 Qb4 33. f5 Ngf4 34. Nxf4 Qe1+ 35. Kh2 Qxe4 36. Nxe6 Rfb8 37. Nc5 Qd4 38. Ne6 Qd1 39. Qg2 Qe1 40. Re2 Qxh4+ 41. Rh3 Qe7 42. Qxd5 Rxb2 43. Ng5+ Kf8 44. Nxh7+ Ke8 45. Nf6+ 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.18"]
[Round "2"]
[White "Clemens, Adrian HP"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "E32"]
[WhiteElo "2261"]
[BlackElo "2106"]
[PlyCount "72"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 b6 5. e4 c5 6. dxc5 Bb7 7. e5 Ne4 8. cxb6 Qxb6 9. f3 Nxc3 10. bxc3 Bc5 11. Nh3 Qc7 12. Bf4 Nc6 13. Rb1 Rb8 14. Bd3 Nxe5 15. Ke2 Bb6 16. Rb5 d6 17. Bxe5 dxe5 18. Rhb1 0-0 19. Bxh7+ Kh8 20. c5 Bxc5 21. Qa4 g6 22. Qh4 Kg7 23. Bxg6 Rh8 24. Qg4 fxg6 25. Ng5 Bd5 26. c4 Rxb5 27. Rxb5 Qc6 28. a4 Bd4 29. Rb7+ Qxb7 30. cxd5 Qb2+ 31. Kd1 Qb3+ 32. Ke1 Qe3+ 33. Kd1 Qd3+ 34. Ke1 Bc3+ 35. Kf2 Qd2+ 36. Kg3 Qe1# 0-1

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2008.10.17"]
[Round "1"]
[White "Groenewold, Jan Joris"]
[Black "Vedder, Henk"]
[Result "0-1"]
[ECO "D30"]
[WhiteElo "2106"]
[BlackElo "2358"]
[PlyCount "128"]
[EventDate "2008.10.17"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 126 Extra"]
[Source "ChessBase"]
[SourceDate "2008.11.05"]
[SourceVersion "1"]
[SourceVersionDate "2008.11.05"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. g3 c6 5. Qc2 b5 6. c5 Ne4 7. Bg2 Nd7 8. 0-0 Be7 9. Nfd2 Nxd2 10. Nxd2 f5 11. f3 Bf6 12. Nb3 a5 13. a4 Ba6 14. Be3 0-0 15. Bf2 bxa4 16. Rxa4 Bb5 17. Ra2 a4 18. Nc1 Qa5 19. Rd1 Bc4 20. Ra3 Rfb8 21. e4 fxe4 22. fxe4 Qb5 23. Bh3 Nf8 24. Rd2 e5 25. exd5 Bxd5 26. Bf1 Qa5 27. dxe5 Bxe5 28. Rxd5 cxd5 29. Nd3 Bf6 30. Bg2 Qd8 31. Rxa4 Rxa4 32. Qxa4 Bxb2 33. Qa2 Qf6 34. c6 Bc3 35. Nf4 Kh8 36. Nxd5 Qxc6 37. Qc2 Rb2 38. Qf5 Bf6 39. h3 Qe6 40. Qf3 Rb8 41. Nxf6 Qxf6 42. Qe4 Ne6 43. Be3 Rf8 44. Qd5 Rd8 45. Qe4 Ng5 46. Qg4 Nf7 47. Kh2 Ne5 48. Qe4 Nd3 49. Qg4 Ne1 50. Bg5 Qf2 51. Qe4 Rf8 52. Bf4 h6 53. Kh1 Nxg2 54. Qxg2 Qe1+ 55. Qg1 Qe2 56. Qg2 Qd3 57. Qc6 Rd8 58. h4 Rd5 59. Qe8+ Kh7 60. Kg2 Rc5 61. Qa8 Rc2+ 62. Kh3 Qf5+ 63. g4 Qxf4 64. Qa1 Qe3# 0-1

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.29"]
[Round "8"]
[White "Groenewold, Jan Joris"]
[Black "Bijlsma, Nick"]
[Result "0-1"]
[ECO "A03"]
[WhiteElo "2110"]
[PlyCount "86"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. f4 d5 2. Nf3 g6 3. g3 Bg7 4. Bg2 c5 5. d3 Nf6 6. 0-0 Nc6 7. c3 0-0 8. Be3 b6 9. Kh1 Bb7 10. d4 c4 11. Nbd2 e6 12. Bg1 b5 13. e4 dxe4 14. Ng5 Ne7 15. Ngxe4 Nxe4 16. Nxe4 Nd5 17. Qe2 Kh8 18. h3 Nf6 19. Nc5 Bxg2+ 20. Kxg2 Qd5+ 21. Rf3 a6 22. Kh2 Ng8 23. Bf2 Ne7 24. Rf1 Nc6 25. g4 b4 26. Qe4 bxc3 27. bxc3 Rfb8 28. Bg3 Rb2+ 29. R3f2 Rxf2+ 30. Rxf2 Ne7 31. Qb1 Bf8 32. Bh4 Kg7 33. Ne4 Ng8 34. f5 exf5 35. gxf5 Re8 36. Ng5 Bd6+ 37. Kg1 Nh6 38. fxg6 hxg6 39. Nf3 Nf5 40. Bg5 Bg3 41. Rf1 Re2 42. Qb6 Bh2+ 43. Kh1 Ng3# 0-1

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.28"]
[Round "7"]
[White "Banning, Cees"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "B46"]
[BlackElo "2110"]
[PlyCount "86"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Be3 Ne7 6. Nc3 Nec6 7. a3 Nxd4 8. Qxd4 b5 9. Be2 Nc6 10. Qd2 Bb7 11. Rd1 d6 12. 0-0 Rc8 13. f4 Na5 14. f5 Nc4 15. Bxc4 Rxc4 16. fxe6 fxe6 17. Qf2 Kd7 18. Qf7+ Be7 19. Rxd6+ Kxd6 20. Rd1+ Bd5 21. Nxd5 exd5 22. Rxd5+ Kc6 23. Rxd8 Bxd8 24. Qd5+ Kc7 25. Bf4+ Kb6 26. Qd6+ Rc6 27. Qb8+ Ka5 28. Bd2+ Ka4 29. Qf4 Rxc2 30. Qd6 Kb3 31. Bc3 Ka2 32. Qe6+ Kb1 33. Bxg7 Bh4 34. Bh6 Re2 35. g3 Rd8 36. Qb3 Rxb2 37. Qf3 Bf6 38. Be3 Be5 39. Kh1 Rd3 40. Qf1+ Kc2 41. Qc1+ Kb3 42. Qc5 Rd1+ 43. Bg1 Rbb1 0-1

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.27"]
[Round "6"]
[White "Groenewold, Jan Joris"]
[Black "Sparenberg, Erik"]
[Result "1/2-1/2"]
[ECO "E71"]
[WhiteElo "2110"]
[BlackElo "2024"]
[PlyCount "26"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3 c5 6. d5 Nbd7 7. Nge2 a6 8. Ng3 0-0 9. f4 Ne8 10. Bd3 e6 11. 0-0 Nc7 12. a4 exd5 13. cxd5 Rb8 1/2-1/2

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.26"]
[Round "5"]
[White "Pouw, Marcel Andre"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "E13"]
[WhiteElo "1925"]
[BlackElo "2110"]
[PlyCount "92"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 h6 6. Bh4 Bb7 7. Qc2 Be4 8. Qb3 Nc6 9. 0-0-0 Bxc3 10. Qxc3 Qe7 11. a3 g5 12. Bg3 d5 13. Ne5 Na5 14. f3 Bh7 15. e4 dxc4 16. Nxc4 Nxc4 17. Bxc4 0-0 18. h4 Nh5 19. Bf2 Bg6 20. g3 c6 21. hxg5 hxg5 22. Be2 c5 23. d5 exd5 24. Rxd5 Ng7 25. Rh6 Rad8 26. Bc4 Rxd5 27. Bxd5 Qd6 28. Qe1 Ne6 29. Qe3 Kg7 30. Rh1 Qe5 31. Bxe6 fxe6 32. Be1 Kf7 33. Rh6 Rd8 34. Rh2 Qd4 35. Qxd4 Rxd4 36. Bc3 Rd3 37. Rf2 Ke7 38. Kc2 c4 39. Bb4+ Kf7 40. g4 e5 41. Bc3 Ke6 42. b3 Rxf3 43. Re2 cxb3+ 44. Kxb3 Rf4 45. a4 Bxe4 46. Bd2 Rxg4 0-1

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.24"]
[Round "4"]
[White "Groenewold, Jan Joris"]
[Black "Zuiderweg, Edwin"]
[Result "1-0"]
[ECO "E90"]
[WhiteElo "2110"]
[BlackElo "1996"]
[PlyCount "87"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 e5 7. d5 a5 8. Bg5 h6 9. Be3 Na6 10. g4 Ne8 11. Rg1 Kh7 12. Qd2 Nc5 13. Be2 f5 14. gxf5 gxf5 15. exf5 Bxf5 16. 0-0-0 Qe7 17. Rg3 b6 18. Rdg1 Rg8 19. Ng5+ Kh8 20. Rf3 Qd7 21. Ne6 Bxe6 22. dxe6 Qxe6 23. Rfg3 Nf6 24. Rg6 Qf5 25. Bxh6 Bxh6 26. Qxh6+ Nh7 27. Nd5 Qf7 28. Bh5 Nd3+ 29. Kd2 Qxf2+ 30. Kxd3 Qd4+ 31. Kc2 Qxc4+ 32. Nc3 Raf8 33. Be2 Qf7 34. Bd3 Rxg6 35. Rxg6 Qf2+ 36. Kb3 Qf7+ 37. Ka3 d5 38. Nxd5 Rd8 39. Rf6 Qg8 40. Qxh7+ Qxh7 41. Bxh7 Rxd5 42. Bf5 Kg7 43. Rg6+ Kf8 44. Rc6 1-0

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.23"]
[Round "3"]
[White "Mostertman, Johan"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B02"]
[BlackElo "2110"]
[PlyCount "62"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. e4 Nf6 2. Bc4 Nxe4 3. Bxf7+ Kxf7 4. Qh5+ g6 5. Qd5+ e6 6. Qxe4 Bg7 7. d4 d5 8. Qf4+ Qf6 9. Nf3 Rf8 10. Qxc7+ Kg8 11. 0-0 Nc6 12. c3 h6 13. Na3 g5 14. Qg3 Ne7 15. Ne5 Nf5 16. Qg4 Nd6 17. Be3 Nf7 18. f4 Nxe5 19. fxe5 Qg6 20. h4 b6 21. Rxf8+ Bxf8 22. Rf1 Be7 23. hxg5 hxg5 24. Rf3 Ba6 25. Rg3 Rf8 26. Bxg5 Rf1+ 27. Kh2 Bxg5 28. Qxg5 Qxg5 29. Rxg5+ Kf7 30. Rg3 Ra1 31. Nc2 Be2 1-0

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.22"]
[Round "2"]
[White "Groenewold, Jan Joris"]
[Black "Slagter, Ruben"]
[Result "1-0"]
[ECO "A04"]
[WhiteElo "2110"]
[BlackElo "1895"]
[PlyCount "77"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. g3 Bg7 4. Bg2 Nc6 5. 0-0 e6 6. d3 Nge7 7. c3 0-0 8. a4 d5 9. Qe2 d4 10. Ra3 e5 11. Nbd2 b6 12. Nc4 Ba6 13. Bd2 h6 14. Be1 Qd7 15. cxd4 Nxd4 16. Nxd4 cxd4 17. b3 Nc6 18. f4 Bxc4 19. bxc4 exf4 20. gxf4 Rae8 21. Qf3 Kh7 22. Ra2 Qe7 23. Qg3 Nd8 24. a5 f5 25. axb6 axb6 26. Rb2 Qc7 27. Bb4 Rf7 28. e5 Ne6 29. Bd6 Qd8 30. Bc6 Rg8 31. Bd5 g5 32. Bxe6 gxf4 33. Rxf4 Bxe5 34. Bxe5 Rxg3+ 35. hxg3 Qa8 36. Bxd4 Re7 37. Bxf5+ Kg8 38. Be4 Qc8 39. Rbf2 1-0

[Event "Groningen Harmonie op-B"]
[Site "Groningen"]
[Date "2007.12.21"]
[Round "1"]
[White "Westermann, Natalia"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "B22"]
[BlackElo "2110"]
[PlyCount "52"]
[EventDate "2007.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 121 Extra"]
[Source "ChessBase"]
[SourceDate "2008.01.10"]
[SourceVersion "1"]
[SourceVersionDate "2008.01.10"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 cxd4 5. Nf3 Nc6 6. cxd4 e6 7. Bc4 Nc7 8. Nc3 d5 9. Bd3 Be7 10. 0-0 Bd7 11. a3 b5 12. Be3 Na5 13. Nd2 Nc4 14. Nxc4 bxc4 15. Bc2 Rb8 16. Rb1 h5 17. g4 g6 18. Kh1 Bc6 19. Rg1 hxg4 20. Rxg4 Kd7 21. Na4 Kc8 22. Nc5 Bxc5 23. dxc5 d4+ 24. Kg1 dxe3 25. Qxd8+ Rxd8 26. fxe3 Rd2 0-1

[Event "Arnhem op"]
[Site "Arnhem"]
[Date "2007.09.02"]
[Round "5"]
[White "Groenewold, Jan Joris"]
[Black "Wilgenhof, Otto"]
[Result "1/2-1/2"]
[ECO "E90"]
[WhiteElo "2110"]
[BlackElo "2230"]
[PlyCount "104"]
[EventDate "2007.08.31"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. h3 e5 7. d5 Nbd7 8. Bg5 h6 9. Be3 a6 10. g4 Nc5 11. Nd2 c6 12. b4 cxd5 13. cxd5 Ncd7 14. Nc4 Ne8 15. Qd2 Qh4 16. 0-0-0 f5 17. gxf5 gxf5 18. exf5 b5 19. Na5 Qxb4 20. Nc6 Qa3+ 21. Qb2 Qxb2+ 22. Kxb2 Ndf6 23. a4 Rf7 24. axb5 axb5 25. Bxb5 Bxf5 26. Ra1 Rxa1 27. Rxa1 Nc7 28. Bc4 Bxh3 29. Ra7 Nfe8 30. Nd8 Re7 31. Nc6 Rd7 32. Ne4 Bf5 33. f3 h5 34. Bg5 Bxe4 35. fxe4 Bf6 36. Be3 Rg7 37. Bb6 h4 38. Bf1 Kh7 39. Bh3 Kh6 40. Bf5 Bg5 41. Kc2 Bf4 42. Nd8 Nb5 43. Rxg7 Nxg7 44. Bh3 Bg5 45. Ne6 Nxe6 46. Bxe6 Na3+ 47. Kd3 Bc1 48. Ke2 Nc4 49. Bd8 Bg5 50. Bc7 Nd2 51. Bxd6 Nxe4 52. Bxe5 Bf6 1/2-1/2

[Event "Arnhem op"]
[Site "Arnhem"]
[Date "2007.09.01"]
[Round "3"]
[White "Groenewold, Jan Joris"]
[Black "Rijnaarts, Sjef"]
[Result "1-0"]
[ECO "E01"]
[WhiteElo "2110"]
[BlackElo "2292"]
[PlyCount "59"]
[EventDate "2007.08.31"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. g3 e6 4. Bg2 Bd6 5. 0-0 0-0 6. c4 c6 7. Qc2 h6 8. b3 Qe7 9. Bb2 dxc4 10. Qxc4 b5 11. Qc2 Bb7 12. Nc3 Na6 13. Rac1 Rac8 14. Qb1 Rfd8 15. Nd2 e5 16. Nf3 e4 17. Ne5 e3 18. fxe3 b4 19. Ne4 Bxe5 20. dxe5 Nxe4 21. Qxe4 Rd2 22. Ba1 Rxe2 23. Qg4 Rxe3 24. Rcd1 Rc7 25. Bd4 Rxe5 26. Bxe5 Qxe5 27. Rd8+ Kh7 28. Be4+ g6 29. Rxf7+ Rxf7 30. Qxg6# 1-0

[Event "Arnhem op"]
[Site "Arnhem"]
[Date "2007.09.01"]
[Round "4"]
[White "Van der Velden, A."]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "E32"]
[BlackElo "2110"]
[PlyCount "53"]
[EventDate "2007.08.31"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 b6 5. e4 Bxc3+ 6. bxc3 d6 7. e5 dxe5 8. dxe5 Nfd7 9. Qe4 c6 10. Ba3 Qg5 11. Nf3 Qg6 12. Qe3 Na6 13. Bd3 f5 14. exf6 Qxf6 15. 0-0 Nac5 16. Bc2 0-0 17. Ng5 g6 18. Ne4 Qf4 19. Qe2 Ba6 20. Bc1 Qf7 21. Bh6 Rfd8 22. Bg5 Rf8 23. Rad1 Nxe4 24. Qxe4 Nc5 25. Qh4 e5 26. Bb3 Rae8 27. Bh6 1/2-1/2

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.30"]
[Round "9"]
[White "Groenewold, Jan Joris"]
[Black "Schiffer, Kai Uwe"]
[Result "1/2-1/2"]
[ECO "E92"]
[WhiteElo "2159"]
[BlackElo "2319"]
[PlyCount "38"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3 0-0 6. Nf3 Na6 7. Be3 e5 8. d5 Nc5 9. Nd2 a5 10. g4 c6 11. Be2 a4 12. Qc2 Qa5 13. Kf1 Rb8 14. Kg2 Bd7 15. Rhb1 Qb4 16. a3 Qa5 17. b4 axb3 18. Nxb3 Nxb3 19. Rxb3 c5 1/2-1/2

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.29"]
[Round "8"]
[White "Jelic, Bruno"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "A81"]
[BlackElo "2159"]
[PlyCount "148"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. d4 f5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. 0-0 0-0 6. b4 Ne4 7. c4 c6 8. Bb2 d5 9. Nbd2 Be6 10. cxd5 Bxd5 11. Qc2 Qd6 12. a3 Nd7 13. Nc4 Qe6 14. Nfd2 Nxd2 15. Nxd2 f4 16. Rae1 Bxg2 17. Kxg2 Qd5+ 18. Qe4 Nf6 19. Qxd5+ Nxd5 20. Nc4 Rad8 21. Ne5 Bxe5 22. dxe5 Kf7 23. Bc1 Ke6 24. Bb2 a5 25. bxa5 Ra8 26. Rb1 Rxa5 27. Rfc1 Rc8 28. Bd4 b5 29. Rb3 Ra4 30. e3 fxe3 31. fxe3 Rc4 32. Re1 Rc2+ 33. Kf3 c5 34. Ba1 Rb8 35. Reb1 Nc7 36. h4 Kd5 37. Rd3+ Kc6 38. Rbd1 Rf8+ 39. Kg4 Ne6 40. R1d2 Rc1 41. Rd1 h5+ 42. Kh3 Rf1 43. Rxf1 Rxf1 44. Bc3 c4 45. Rd2 Rc1 46. Bb4 Nc5 47. Rd8 Ne4 48. Kg2 c3 49. Kf3 Nd2+ 50. Ke2 Nc4 51. Bxe7 c2 52. Kd3 Nxe3 53. Kxe3 Re1+ 54. Kd3 c1Q 55. Rc8+ Kd5 56. Rxc1 Rxc1 57. Bg5 Rg1 58. Bf4 Ra1 59. Kc3 Rxa3+ 60. Kb4 Ra8 61. Kxb5 Rc8 62. Kb6 Ke6 63. Kb7 Rc2 64. Kb6 Kd5 65. Kb7 Rc6 66. Kb8 Ke6 67. Kb7 Rc5 68. Kb6 Rxe5 69. Kc7 Rd5 70. Kc8 Kf5 71. Kc7 Kg4 72. Kc6 Rd3 73. Bg5 Kxg3 74. Kc5 Kg4 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.28"]
[Round "7"]
[White "Groenewold, Jan Joris"]
[Black "Heemskerk, Wim"]
[Result "1/2-1/2"]
[ECO "A57"]
[WhiteElo "2159"]
[BlackElo "2269"]
[PlyCount "46"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. e3 g6 6. Nc3 Bg7 7. a4 0-0 8. Qb3 axb5 9. Bxb5 e6 10. Nge2 exd5 11. Nxd5 Nxd5 12. Qxd5 Qb6 13. e4 Bb7 14. Qc4 Nc6 15. 0-0 Rfe8 16. Nc3 Nd4 17. Be3 Re6 18. Bxd7 Ba6 19. Bb5 Rb8 20. Rfc1 Qa7 21. Nd5 Rxe4 22. Kh1 Re6 23. h3 Qb7 1/2-1/2

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.27"]
[Round "6"]
[White "Schulze, Joachim"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "B41"]
[WhiteElo "2046"]
[BlackElo "2159"]
[PlyCount "52"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 Bb4 7. f3 Nc6 8. Be3 0-0 9. Nc2 Bxc3+ 10. bxc3 d5 11. exd5 exd5 12. Be2 Qa5 13. Qd2 dxc4 14. Bxc4 Rd8 15. Nd4 Be6 16. Bxe6 fxe6 17. Nxc6 bxc6 18. Qc2 Nd5 19. Bd2 Qc5 20. Qe4 Nxc3 21. Bxc3 Qxc3+ 22. Kf2 Rd2+ 23. Kg3 Qf6 24. f4 Rd4 25. Qe5 Qg6+ 26. Kh3 Rd5 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.26"]
[Round "5"]
[White "Groenewold, Jan Joris"]
[Black "Florath, Patrick"]
[Result "0-1"]
[ECO "E09"]
[WhiteElo "2159"]
[BlackElo "2310"]
[PlyCount "132"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. Nf3 d5 4. g3 Be7 5. Bg2 0-0 6. 0-0 Nbd7 7. Qc2 c6 8. Nbd2 b6 9. b3 Bb7 10. Bb2 Rc8 11. Rac1 Qc7 12. Qb1 Qb8 13. cxd5 cxd5 14. Rxc8 Rxc8 15. Rc1 Ne8 16. Bf1 Ba6 17. Rc2 f6 18. Qc1 Rxc2 19. Qxc2 Qc7 20. Ne1 Nb8 21. Qxc7 Nxc7 22. Nc2 Nc6 23. e3 Kf7 24. Nb1 Bxf1 25. Kxf1 e5 26. Ke2 Ke6 27. Ba3 Bxa3 28. Nbxa3 Kf5 29. h3 h5 30. Nb1 exd4 31. exd4 Ne6 32. Ke3 Ng5 33. Nc3 Nxh3 34. Nxd5 g5 35. Ne1 Ng1 36. Ng2 Ke6 37. Nc7+ Kf5 38. Nd5 b5 39. f3 a5 40. Nc3 b4 41. Ne4 Ne7 42. g4+ hxg4 43. fxg4+ Kxg4 44. Nxf6+ Kf5 45. Nd7 Nd5+ 46. Kf2 Nh3+ 47. Kg3 Nhf4 48. Ne1 Ne2+ 49. Kf2 Nxd4 50. Nc5 Nc3 51. Nb7 Nc6 52. Nc2 Nxa2 53. Kg3 Nc1 54. Nc5 Ne2+ 55. Kf2 Ned4 56. Ne3+ Kg6 57. Nc4 Kh5 58. Kg3 Nf5+ 59. Kf2 Kh4 60. Nb7 g4 61. Nbxa5 Nxa5 62. Nxa5 Kh3 63. Nc4 g3+ 64. Kg1 Nd4 65. Nd2 Ne2+ 66. Kh1 g2# 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.24"]
[Round "4"]
[White "Hoeksema, Hendrik Pieter"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B46"]
[WhiteElo "2405"]
[BlackElo "2159"]
[PlyCount "65"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 a6 6. Be3 Nge7 7. Nb3 b5 8. a4 b4 9. a5 Bb7 10. Na4 Nc8 11. Nac5 Qc7 12. Qg4 Ne5 13. Qg3 d6 14. Nxb7 Qxb7 15. f4 Nd7 16. Bd3 h5 17. 0-0 h4 18. Qh3 Be7 19. Rad1 Bf6 20. e5 dxe5 21. f5 e4 22. Bc4 Ne5 23. Nc5 Qc6 24. Bb3 Nd6 25. fxe6 0-0 26. Bd5 Qc7 27. exf7+ Nexf7 28. Rxf6 gxf6 29. Qg4+ Kh8 30. Qh5+ Kg8 31. Ne6 Qc3 32. Qg6+ Kh8 33. Qg7# 1-0

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.23"]
[Round "3"]
[White "Groenewold, Jan Joris"]
[Black "Potze, Rudolf"]
[Result "1-0"]
[ECO "A03"]
[WhiteElo "2159"]
[BlackElo "2130"]
[PlyCount "49"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. f4 c5 2. Nf3 d5 3. g3 Nc6 4. Bg2 Nf6 5. d3 e6 6. 0-0 Be7 7. c3 0-0 8. Qc2 d4 9. e4 dxe3 10. Bxe3 Ng4 11. Bf2 Nxf2 12. Rxf2 Bf6 13. Nbd2 h6 14. Ne4 Be7 15. Ne5 Nxe5 16. fxe5 Qc7 17. Nf6+ Bxf6 18. exf6 g6 19. Qd2 Kh7 20. Rf4 Rh8 21. Rh4 Kg8 22. Rxh6 Rh7 23. Qg5 Qd8 24. Rxg6+ Kh8 25. Rg7 1-0

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.22"]
[Round "2"]
[White "Van der Velde, Werner"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "B46"]
[BlackElo "2159"]
[PlyCount "80"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 a6 6. Be2 Nge7 7. 0-0 Nxd4 8. Qxd4 Nc6 9. Qd1 b5 10. Be3 Bb7 11. f4 Rc8 12. a4 b4 13. Nb1 Na5 14. Nd2 Be7 15. Bd3 d5 16. exd5 Qxd5 17. Qe2 0-0 18. Be4 Qd7 19. Bxb7 Qxb7 20. Nf3 Qe4 21. Rf2 Nc4 22. Bc1 Qd5 23. Rf1 Bf6 24. Rb1 Rfd8 25. c3 bxc3 26. bxc3 Bxc3 27. Be3 Qe4 28. Rfe1 Bxe1 29. Rxe1 Qxe3+ 30. Qxe3 Nxe3 31. Rxe3 Rc2 32. h3 Ra2 33. Re4 Rc8 34. Rd4 f6 35. Re4 Rcc2 36. Rxe6 Rxg2+ 37. Kh1 Rgf2 38. Re3 Ra1+ 39. Ng1 Rff1 40. Rg3 Rxg1+ 0-1

[Event "Groningen op-A"]
[Site "Groningen"]
[Date "2004.12.21"]
[Round "1"]
[White "Groenewold, Jan Joris"]
[Black "Keizer, Theodoor"]
[Result "1/2-1/2"]
[ECO "B20"]
[WhiteElo "2159"]
[PlyCount "43"]
[EventDate "2004.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. c4 g6 2. Nc3 Bg7 3. e4 c5 4. Nf3 Nc6 5. Be2 d6 6. h3 e6 7. 0-0 Nge7 8. a3 0-0 9. Rb1 d5 10. d3 h6 11. Qc2 b6 12. Re1 Nd4 13. Nxd4 cxd4 14. Na2 dxe4 15. dxe4 Bb7 16. Nb4 a5 17. Nd3 Bxe4 18. f3 Bf5 19. g4 Bxd3 20. Bxd3 Qc7 21. f4 Rac8 22. Qf2 1/2-1/2

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2004.10.23"]
[Round "9"]
[White "Nagel, Yvette"]
[Black "Groenewold, Jan Joris"]
[Result "0-1"]
[ECO "B40"]
[WhiteElo "2051"]
[BlackElo "2159"]
[PlyCount "52"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. c3 Nf6 4. Bd3 Nc6 5. Bc2 Qa5 6. 0-0 c4 7. d4 cxd3 8. Qxd3 d5 9. e5 Nd7 10. Bf4 h6 11. h4 g5 12. hxg5 hxg5 13. Nxg5 Ndxe5 14. Qg3 Bd6 15. Nh7 Qd8 16. Qg7 Kd7 17. Re1 Nf3+ 18. Kf1 Nxe1 19. Bg5 Be7 20. Qxf7 Nxc2 21. Nf6+ Kc7 22. Na3 Nxa1 23. Bf4+ Kb6 24. Be3+ d4 25. cxd4 Nxd4 26. Nc4+ Ka6 0-1

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2004.10.22"]
[Round "8"]
[White "Groenewold, Jan Joris"]
[Black "Hemminga, Fokko"]
[Result "1-0"]
[ECO "A07"]
[WhiteElo "2159"]
[BlackElo "2089"]
[PlyCount "67"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 Nf6 3. Bg2 Bf5 4. 0-0 e6 5. d3 Bd6 6. Nbd2 e5 7. Re1 Qd7 8. e4 dxe4 9. dxe4 Bh3 10. Nc4 Bxg2 11. Kxg2 0-0 12. Ncxe5 Bxe5 13. Nxe5 Qxd1 14. Rxd1 Nxe4 15. Be3 a6 16. Rd4 Nd6 17. Bf4 f6 18. Nf3 Nb5 19. Rd2 g5 20. a4 gxf4 21. axb5 fxg3 22. hxg3 c6 23. b6 a5 24. b4 a4 25. c4 a3 26. Rd3 Ra4 27. Rb3 a2 28. Rb2 Na6 29. Raxa2 Rxa2 30. Rxa2 Nxb4 31. Ra7 Rf7 32. Nd4 c5 33. Ne6 Nc6 34. Ra8+ 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2004.10.21"]
[Round "7"]
[White "Van Geffen, Ben"]
[Black "Groenewold, Jan Joris"]
[Result "1-0"]
[ECO "B46"]
[WhiteElo "2181"]
[BlackElo "2159"]
[PlyCount "111"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 a6 6. g3 Nge7 7. Nb3 d6 8. Bg2 Bd7 9. 0-0 Nc8 10. f4 Be7 11. Qe2 0-0 12. Be3 b5 13. Rad1 Nb6 14. e5 d5 15. Nd4 Nc4 16. Nxc6 Bxc6 17. Bd4 b4 18. Nb1 Bb5 19. Qg4 Bd7 20. b3 Nb6 21. c4 bxc3 22. Nxc3 f5 23. exf6 Bxf6 24. Be5 Rc8 25. Ne2 Bxe5 26. fxe5 Qc7 27. Qd4 Rxf1+ 28. Bxf1 Qc5 29. Qxc5 Rxc5 30. Nd4 a5 31. Kf2 Nc8 32. Rd2 Ne7 33. Bd3 Rc1 34. Rc2 Rxc2+ 35. Bxc2 Kf7 36. Ke3 h6 37. h4 Ke8 38. Bd1 Kd8 39. Bg4 Ng6 40. Bxe6 Nxe5 41. Kf4 Nd3+ 42. Kf5 Be8 43. Bxd5 Ke7 44. Bc4 Nc5 45. Bb5 g6+ 46. Ke5 Bxb5 47. Nxb5 a4 48. bxa4 Nxa4 49. g4 Nb6 50. Nc3 Nd7+ 51. Kf4 Kd6 52. Ne4+ Kd5 53. a4 Kc4 54. Nd6+ Kb4 55. Nf7 g5+ 56. Nxg5 1-0

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2004.10.20"]
[Round "6"]
[White "Groenewold, Jan Joris"]
[Black "Giddins, Stephen"]
[Result "0-1"]
[ECO "E04"]
[WhiteElo "2159"]
[BlackElo "2248"]
[PlyCount "92"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Nc6 6. 0-0 Rb8 7. Nc3 b5 8. Ne5 Nxe5 9. dxe5 Nd7 10. Bc6 a6 11. Qd4 Bb7 12. Bg5 Be7 13. Bxe7 Qxe7 14. Bxd7+ Qxd7 15. Qg4 Qc6 16. f3 Qc5+ 17. Kg2 Qxe5 18. Qf4 Qxf4 19. gxf4 Ke7 20. Rfd1 Rhd8 21. Kf2 c5 22. Rxd8 Rxd8 23. Rd1 Rxd1 24. Nxd1 a5 25. Ke3 Kf6 26. Nf2 Kf5 27. Nh3 f6 28. Kd2 b4 29. e4+ Kg6 30. Nf2 Kh5 31. Nd1 Kh4 32. Ne3 Ba6 33. f5 e5 34. Nd5 Kh3 35. Nc7 c3+ 36. bxc3 Bc4 37. Ne8 Bxa2 38. Nxg7 Bf7 39. Ne6 bxc3+ 40. Kxc3 Kxh2 41. f4 exf4 42. Nxf4 Kg3 43. Nd5 h5 44. Nxf6 Kf4 45. Nxh5+ Bxh5 46. Kc4 a4 0-1

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2004.10.19"]
[Round "5"]
[White "Hulshof, Peter"]
[Black "Groenewold, Jan Joris"]
[Result "1/2-1/2"]
[ECO "B25"]
[WhiteElo "2209"]
[BlackElo "2159"]
[PlyCount "75"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 e6 6. f4 d6 7. Nf3 Nge7 8. 0-0 0-0 9. Be3 a6 10. Bf2 Ra7 11. d4 b6 12. dxc5 dxc5 13. e5 Rd7 14. Qe2 Bb7 15. Ne4 Kh8 16. c3 Nc8 17. g4 N6e7 18. Bh4 Bxe4 19. Qxe4 b5 20. Qe3 Qc7 21. Ng5 Nd5 22. Qh3 h6 23. Ne4 Re8 24. Nf6 Bxf6 25. Bxf6+ Nxf6 26. exf6 Kh7 27. Rf3 Rd5 28. f5 exf5 29. gxf5 Nd6 30. fxg6+ fxg6 31. Raf1 Nf7 32. Re3 Rxe3 33. Qxe3 Re5 34. Qf3 Rf5 35. Qb7 Rxf1+ 36. Kxf1 Qf4+ 37. Ke2 Qxf6 38. Bd5 1/2-1/2

[Event "Hoogeveen Essent op"]
[Site "Hoogeveen"]
[Date "2004.10.18"]
[Round "4"]
[White "Groenewold, Jan Joris"]
[Black "Westerkamp, Bert"]
[Result "1-0"]
[ECO "E18"]
[WhiteElo "2159"]
[BlackElo "2115"]
[PlyCount "65"]
[EventDate "2004.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. c4 e6 5. 0-0 Be7 6. d4 d6 7. Nc3 0-0 8. Qc2 Nbd7 9. Rd1 Qc8 10. Bf4 Re8 11. Rac1 Bf8 12. h3 e5 13. Be3 g6 14. b4 Bg7 15. Qb3 exd4 16. Bxd4 Nh5 17. Bxg7 Nxg7 18. Nd5 a5 19. a3 axb4 20. axb4 Bxd5 21. cxd5 Rxe2 22. Nd4 Re7 23. Nb5 Ne8 24. Qc3 Ra2 25. Ra1 Ree2 26. Rxa2 Rxa2 27. Rc1 Ndf6 28. Nxd6 Nxd6 29. Qxf6 Re2 30. Bf3 Ne4 31. Qe5 f6 32. Qe6+ Qxe6 33. dxe6 1-0

