[Event "Utrecht OKU op 46th"]
[Site "Utrecht"]
[Date "2019.05.31"]
[Round "1"]
[White "Haast, Mark"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "A14"]
[WhiteElo "2391"]
[BlackElo "1977"]
[PlyCount "51"]
[EventDate "2019.05.31"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 190 Extra"]
[Source "ChessBase"]
[SourceDate "2019.07.15"]
[SourceVersion "1"]
[SourceVersionDate "2019.07.15"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 e6 3. Bg2 d5 4. Nf3 Be7 5. 0-0 0-0 6. b3 c5 7. Bb2 Nc6 8. e3 Qb6 9. d3 Rd8 10. Qe2 Bd7 11. Nc3 Be8 12. Rac1 Rac8 13. Na4 Qa6 14. Bxf6 gxf6 15. cxd5 Rxd5 16. Ne1 Rdd8 17. Rxc5 Bxc5 18. Nxc5 Qb6 19. Qg4+ Kf8 20. d4 Ke7 21. Qh4 e5 22. Ne4 exd4 23. Nxf6 Kf8 24. Bh3 dxe3 25. Qh6+ Ke7 26. Ng8# 1-0

[Event "Utrecht OKU op 45th"]
[Site "Utrecht"]
[Date "2018.06.01"]
[Round "1"]
[White "De Groot, Pieter"]
[Black "Riemersma, Liafbern"]
[Result "0-1"]
[ECO "D37"]
[WhiteElo "2044"]
[BlackElo "2458"]
[PlyCount "64"]
[EventDate "2018.06.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. c4 e6 4. e3 Be7 5. Nc3 0-0 6. Be2 dxc4 7. 0-0 a6 8. Bxc4 b5 9. Bd3 Bb7 10. Qe2 c5 11. dxc5 Bxc5 12. e4 Nbd7 13. Bg5 h6 14. Bh4 Qb8 15. Rac1 Nh5 16. Bb1 Rc8 17. Rfd1 Nf4 18. Qe1 Ne5 19. Nxe5 Qxe5 20. Bg3 g5 21. Rd7 Bc6 22. Rd2 Bd4 23. Qd1 Bb6 24. Ne2 Bxe4 25. Nxf4 Rxc1 26. Qxc1 gxf4 27. Re2 fxg3 28. Bxe4 gxf2+ 29. Kh1 Kg7 30. Qf1 Rc8 31. g3 Qg5 32. Rxf2 Bxf2 0-1

[Event "Utrecht OKU op 44th"]
[Site "Utrecht"]
[Date "2017.06.10"]
[Round "3"]
[White "Elgersma, Simon"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "2142"]
[BlackElo "2097"]
[PlyCount "41"]
[EventDate "2017.06.09"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 Be7 8. Qd2 a6 9. dxc5 Nxc5 10. 0-0-0 Qc7 11. Kb1 b5 12. Qf2 Nd7 13. g4 Bb7 14. Bg2 g5 15. Nxg5 Bxg5 16. fxg5 Ncxe5 17. Bf4 Qd8 18. Rhe1 Ng6 19. Bxd5 Bxd5 20. Nxd5 Qc8 21. Nc7+ 1-0

[Event "Utrecht OKU op 44th"]
[Site "Utrecht"]
[Date "2017.06.09"]
[Round "1"]
[White "Lalic, Bogdan"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "E08"]
[WhiteElo "2445"]
[BlackElo "2097"]
[PlyCount "71"]
[EventDate "2017.06.09"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 Nbd7 7. Qc2 c6 8. Rd1 b6 9. Nc3 Bb7 10. b3 Rc8 11. e4 dxe4 12. Nxe4 Nxe4 13. Qxe4 Qe8 14. Bb2 Rc7 15. Qc2 Qc8 16. Bc1 Qa8 17. Bf4 Rcc8 18. c5 Rfd8 19. b4 Nf8 20. h4 bxc5 21. bxc5 a5 22. h5 h6 23. Ne5 Bf6 24. Rab1 Bxe5 25. dxe5 Rxd1+ 26. Rxd1 a4 27. Rd6 Qa5 28. Bd2 Qa7 29. a3 Qa8 30. Bb4 Rc7 31. Qd2 Rc8 32. Qd1 Re8 33. Be4 Nh7 34. Bc2 f6 35. Bxh7+ Kxh7 36. exf6 1-0

[Event "Utrecht OKU op 43rd"]
[Site "Utrecht"]
[Date "2016.06.04"]
[Round "2"]
[White "Van Overdam, Julian"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "C45"]
[WhiteElo "2351"]
[BlackElo "2160"]
[PlyCount "61"]
[EventDate "2016.06.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 172 Extra"]
[Source "ChessBase"]
[SourceDate "2016.06.21"]
[SourceVersion "1"]
[SourceVersionDate "2016.06.21"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nxc6 dxc6 6. Qxd8+ Kxd8 7. Bd3 Ne7 8. Nd2 a5 9. Nb3 Bb6 10. Bf4 Be6 11. Bg3 Kc8 12. 0-0 a4 13. Nd2 Bc5 14. Bc4 Bxc4 15. Nxc4 Re8 16. Ne5 f6 17. Nd3 Bd6 18. f4 Ng8 19. Rae1 Ra5 20. Re2 c5 21. c4 Rd8 22. Ne1 Bf8 23. Nc2 Ne7 24. Ree1 Ra6 25. Ne3 Re6 26. e5 fxe5 27. fxe5 Nc6 28. Nd5 Ne7 29. Rf7 c6 30. Nb6+ Kb8 31. Rxf8 1-0

[Event "NED-chT 1516"]
[Site "Netherlands"]
[Date "2015.10.10"]
[Round "2.8"]
[White "Vedder, Richard"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "2261"]
[BlackElo "2185"]
[PlyCount "51"]
[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 "En Passant"]
[BlackTeam "Utrecht"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 a6 8. a3 b5 9. dxc5 Bxc5 10. Bxc5 Nxc5 11. b4 Nd7 12. Bd3 Qb6 13. Qd2 Bb7 14. Qf2 Qxf2+ 15. Kxf2 Nb6 16. Rhb1 Rc8 17. a4 Ne7 18. Rb3 Bc6 19. axb5 axb5 20. Nxb5 0-0 21. Nd6 Rc7 22. Nd4 Rb8 23. Rc3 Nc4 24. Bxc4 Rxb4 25. Nxc6 Nxc6 26. Bb5 1-0

[Event "NED-chT 1516"]
[Site "Netherlands"]
[Date "2015.09.26"]
[Round "1.10"]
[White "De Groot, Pieter"]
[Black "In't Veld, Daan"]
[Result "0-1"]
[ECO "A81"]
[WhiteElo "2185"]
[BlackElo "2202"]
[PlyCount "68"]
[EventDate "2015.09.26"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]
[WhiteTeam "Utrecht"]
[BlackTeam "Groningen Combinatie"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 f5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. 0-0 0-0 6. Nbd2 e6 7. c3 Qe7 8. Qc2 d5 9. Ne5 Nfd7 10. Ndf3 Nxe5 11. Nxe5 c5 12. Nf3 Nd7 13. c4 dxc4 14. Qxc4 cxd4 15. Nxd4 Nb6 16. Qc3 Rd8 17. e3 e5 18. Nb3 Be6 19. e4 f4 20. Re1 g5 21. Bd2 Rac8 22. Qb4 Qf7 23. Bc3 Qh5 24. Nd2 fxg3 25. hxg3 Rc6 26. Nf1 Bh3 27. Bh1 Bxf1 28. Rxf1 Rh6 29. Kg2 Rf8 30. f4 gxf4 31. Qb3+ Kh8 32. Bb4 f3+ 33. Rxf3 Qh2+ 34. Kf1 Qxh1+ 0-1

[Event "Utrecht OKU op 38th"]
[Site "Utrecht"]
[Date "2011.06.05"]
[Round "6"]
[White "De Groot, Pieter"]
[Black "Boulahfa, Hicham"]
[Result "0-1"]
[ECO "E19"]
[BlackElo "2079"]
[PlyCount "108"]
[EventDate "2011.06.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 Ne4 7. 0-0 0-0 8. Qc2 Nxc3 9. bxc3 f5 10. a4 Be4 11. Qa2 Bf6 12. Bd2 Nc6 13. Rad1 Na5 14. Ne1 Bxg2 15. Nxg2 Qe7 16. Nf4 Qd6 17. Nd3 Qc6 18. c5 Qd5 19. Qxd5 exd5 20. Bf4 c6 21. Ra1 Nc4 22. Ra2 Rfe8 23. Rb1 Rac8 24. Kg2 g5 25. Bc1 h6 26. h4 Kg7 27. hxg5 hxg5 28. f4 g4 29. cxb6 axb6 30. Ne5 Bxe5 31. fxe5 Rh8 32. Bf4 Rh3 33. Rh1 Rxh1 34. Kxh1 Ra8 35. Kg2 b5 36. a5 Rxa5 37. Rc2 Ra3 38. Kf2 Rb3 39. Ra2 Ra3 40. Rc2 Nb6 41. Bc1 Rb3 42. Bd2 Na4 43. Ke1 Kf7 44. Kd1 Nb2+ 45. Kc1 Nc4 46. Bf4 Na3 47. Ra2 Rxc3+ 48. Kd1 Rb3 49. e3 b4 50. e4 dxe4 51. Rh2 Rb1+ 52. Bc1 b3 53. Rh7+ Kg8 54. Rh2 Nc4 0-1

[Event "Utrecht OKU op 38th"]
[Site "Utrecht"]
[Date "2011.06.04"]
[Round "2"]
[White "De Groot, Pieter"]
[Black "Middelkoop, Erik"]
[Result "1-0"]
[ECO "E11"]
[PlyCount "49"]
[EventDate "2011.06.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Bb4+ 5. Bd2 Be7 6. Nf3 0-0 7. Qc2 Nbd7 8. 0-0 c5 9. Na3 cxd4 10. Nxd4 e5 11. Nf5 Bxa3 12. bxa3 Nb6 13. Bb4 Bxf5 14. Qxf5 Qc8 15. Qxe5 Re8 16. Qd4 Qxc4 17. Qxc4 Nxc4 18. e3 a5 19. Bc3 Ne4 20. Rac1 Nxa3 21. Rfd1 Nb5 22. Be1 Red8 23. a4 Na3 24. Rd3 Nc4 25. Bxe4 1-0

[Event "Utrecht OKU op 38th"]
[Site "Utrecht"]
[Date "2011.06.03"]
[Round "1"]
[White "Goudriaan, Etienne"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "E99"]
[WhiteElo "2307"]
[PlyCount "79"]
[EventDate "2011.06.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Nf3 e5 7. 0-0 Nc6 8. d5 Ne7 9. Ne1 Nd7 10. Nd3 f5 11. Bd2 Nf6 12. f3 f4 13. c5 g5 14. Rc1 Ng6 15. Nb5 Rf7 16. Ba5 b6 17. cxd6 cxd6 18. Be1 Bf8 19. Qc2 Ne8 20. Nb4 Qf6 21. Nc6 a6 22. Nba7 Bb7 23. Qb3 Bxc6 24. Nxc6 b5 25. a4 bxa4 26. Qxa4 Nc7 27. Bf2 h5 28. Rc3 Bh6 29. Rfc1 Qg7 30. R1c2 Nf8 31. Bb6 Ne8 32. Nd8 Re7 33. Rc8 Nd7 34. Ne6 Qg6 35. Rxa8 Nxb6 36. Qxa6 Nxd5 37. Qxd6 Ndc7 38. Qxe7 Nxa8 39. Rc8 Nac7 40. Qxc7 1-0

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2009.06.07"]
[Round "5"]
[White "De Groot, Pieter"]
[Black "Galje, Hans"]
[Result "1-0"]
[ECO "D40"]
[BlackElo "2152"]
[PlyCount "73"]
[EventDate "2009.06.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 130 Extra"]
[Source "ChessBase"]
[SourceDate "2009.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2009.07.15"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. e3 d5 5. Nc3 Nc6 6. Be2 cxd4 7. exd4 Be7 8. 0-0 0-0 9. Bf4 a6 10. Rc1 dxc4 11. Bxc4 b5 12. d5 Nh5 13. Be3 Na5 14. Bd3 Nf6 15. Bg5 b4 16. d6 Bxd6 17. Bxf6 gxf6 18. Ne4 Be7 19. Qd2 Bb7 20. Qe3 f5 21. Nc5 Bd5 22. Rfd1 Nc6 23. Bc4 Bf6 24. Bxd5 exd5 25. Ne6 fxe6 26. Qxe6+ Kh8 27. Rxc6 Qe8 28. Qxd5 Rd8 29. Rd6 Qh5 30. h4 Rxd6 31. Qxd6 Qe8 32. Re1 Qb8 33. Qxa6 Bxb2 34. Ng5 Bg7 35. Qe6 Rf6 36. Qd7 Rf8 37. Ne6 1-0

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2009.06.07"]
[Round "6"]
[White "Miezis, Normunds"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "A36"]
[WhiteElo "2579"]
[PlyCount "89"]
[EventDate "2009.06.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 130 Extra"]
[Source "ChessBase"]
[SourceDate "2009.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2009.07.15"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 c5 3. g3 Nc6 4. Bg2 g6 5. e4 Bg7 6. Nge2 d6 7. 0-0 0-0 8. a3 Bd7 9. h3 a6 10. Rb1 Rb8 11. b4 cxb4 12. axb4 b5 13. cxb5 axb5 14. d4 Qc8 15. d5 Ne5 16. f4 Nc4 17. Kh2 Qc7 18. Nd4 Rfc8 19. Nc6 Bxc6 20. dxc6 e6 21. Rb3 Qb6 22. Ne2 Ne8 23. f5 Nc7 24. Rd3 Ra8 25. fxe6 Nxe6 26. e5 Bxe5 27. Bd5 Ra2 28. Kh1 Rxc6 29. Rdf3 Rc7 30. Bxe6 fxe6 31. Bh6 Qb7 32. Kh2 Rf7 33. Rxf7 Qxf7 34. Rxf7 Kxf7 35. Qf1+ Ke7 36. h4 Rb2 37. Kh3 Kd7 38. Qf7+ Kc6 39. Qe8+ Kb6 40. Qb8+ Kc6 41. Qa8+ Kb6 42. Nf4 Bxf4 43. Bxf4 e5 44. Bg5 Rxb4 45. Bd8+ 1-0

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2009.06.06"]
[Round "2"]
[White "De Groot, Pieter"]
[Black "Van de Groep, William"]
[Result "1-0"]
[ECO "A87"]
[BlackElo "2025"]
[PlyCount "41"]
[EventDate "2009.06.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 130 Extra"]
[Source "ChessBase"]
[SourceDate "2009.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2009.07.15"]
[SourceQuality "1"]

1. d4 f5 2. g3 g6 3. Bg2 Bg7 4. Nf3 Nf6 5. c4 0-0 6. Nc3 d6 7. 0-0 Qe8 8. Nd5 Nxd5 9. cxd5 Nd7 10. Ng5 Nf6 11. Ne6 Bxe6 12. dxe6 c6 13. Qb3 Qc8 14. Bg5 d5 15. Rac1 Rd8 16. Bf4 Ne4 17. Qb4 Bf6 18. Rfd1 Kg7 19. g4 g5 20. Be5 a5 21. Qxe7+ 1-0

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2009.06.05"]
[Round "1"]
[White "Nijboer, Friso"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "C19"]
[WhiteElo "2562"]
[PlyCount "61"]
[EventDate "2009.06.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 130 Extra"]
[Source "ChessBase"]
[SourceDate "2009.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2009.07.15"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. a4 Nbc6 8. Nf3 Bd7 9. Bd3 a6 10. 0-0 b5 11. dxc5 bxa4 12. Re1 Qc7 13. h4 Na5 14. Qd2 Nc4 15. Qg5 Qxc5 16. Qxg7 0-0-0 17. Rb1 Kc7 18. Bg5 Rde8 19. Bf6 a3 20. Qxf7 Rhf8 21. Qxh7 Ng8 22. Bg5 a2 23. Ra1 Qa3 24. Bxc4 dxc4 25. Qe4 Qxc3 26. Bd2 Qa3 27. Qxc4+ Bc6 28. Nd4 Qa4 29. Bb4 Rf4 30. Nxe6+ Rxe6 31. Qxf4 1-0

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2007.06.10"]
[Round "5.8"]
[White "Aarts, Rob"]
[Black "De Groot, Pieter"]
[Result "0-1"]
[ECO "D02"]
[PlyCount "58"]
[EventDate "2007.06.08"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 118 Extra"]
[Source "ChessBase"]
[SourceDate "2007.07.04"]
[SourceVersion "1"]
[SourceVersionDate "2007.07.04"]
[SourceQuality "1"]

1. d4 d5 2. g3 Nf6 3. Bg2 e6 4. Nf3 c5 5. c3 Nc6 6. 0-0 Be7 7. Ne5 Qb6 8. e3 0-0 9. Re1 Qc7 10. f4 b5 11. Nxc6 Qxc6 12. Nd2 Qb6 13. a4 Bd7 14. axb5 Bxb5 15. c4 Bc6 16. cxd5 exd5 17. e4 dxe4 18. Nxe4 cxd4 19. Qd3 Bb5 20. Qb3 Rab8 21. Bd2 Ng4 22. Ba5 Qh6 23. h3 Ne3 24. Rxe3 dxe3 25. Qxe3 Qg6 26. Qxa7 Rfe8 27. Bc3 Bc6 28. Qd4 Rbd8 29. Qe3 Bxe4 0-1

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2007.06.09"]
[Round "3.15"]
[White "De Groot, Pieter"]
[Black "De Leur, Ben"]
[Result "1-0"]
[ECO "E63"]
[BlackElo "2081"]
[PlyCount "73"]
[EventDate "2007.06.08"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 118 Extra"]
[Source "ChessBase"]
[SourceDate "2007.07.04"]
[SourceVersion "1"]
[SourceVersionDate "2007.07.04"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 0-0 5. 0-0 a6 6. c4 d6 7. Nc3 Nc6 8. Bg5 h6 9. Bf4 Nh5 10. Be3 Kh7 11. d5 Na5 12. c5 dxc5 13. Bxc5 Nc4 14. Bd4 Nf6 15. e4 Rb8 16. b3 Nb6 17. Rc1 Nbd7 18. Re1 c5 19. dxc6 bxc6 20. e5 Nd5 21. Ne4 Bb7 22. e6 fxe6 23. Neg5+ hxg5 24. Nxg5+ Kg8 25. Nxe6 Qa5 26. Bxg7 Rf7 27. Bb2 N7f6 28. Qc2 Kh7 29. Ng5+ Kg7 30. h4 Bc8 31. Nxf7 Kxf7 32. Qxc6 Nb4 33. Qc4+ Kf8 34. Be5 Nxa2 35. Bxb8 Nxc1 36. Qxc8+ Kf7 37. Qe6+ 1-0

[Event "Utrecht OKU op"]
[Site "Utrecht"]
[Date "2005.06.??"]
[Round "?"]
[White "Drost, Peter"]
[Black "De Groot, Pieter"]
[Result "0-1"]
[ECO "C58"]
[PlyCount "112"]
[EventDate "2005.06.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 106 Extra"]
[Source "ChessBase"]
[SourceDate "2005.07.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Bd3 Be7 9. 0-0 h6 10. Ne4 Nd5 11. Re1 0-0 12. Nbc3 Qc7 13. a3 f5 14. Ng3 Be6 15. b4 Nxc3 16. dxc3 Nc4 17. Qe2 Nb6 18. Qxe5 Qxe5 19. Rxe5 Kf7 20. Bxf5 Bxf5 21. Rxf5+ Bf6 22. Be3 Rfd8 23. Bd4 Nd5 24. Rf3 a5 25. Bxf6 gxf6 26. c4 Nb6 27. c5 Nc4 28. c3 Rd5 29. h3 Ne5 30. Re3 Rad8 31. Rae1 Kg6 32. f4 Nc4 33. Re7 h5 34. f5+ Kh6 35. R1e6 Rf8 36. Rxc6 h4 37. Ne4 Rxf5 38. a4 Rf4 39. Ree6 Kg7 40. Nf2 Rd8 41. Re4 Rd1+ 42. Nxd1 Rxe4 43. Rc7+ Kg6 44. Rd7 axb4 45. cxb4 Ne5 46. Rb7 Re1+ 47. Kf2 Nd3+ 48. Kf3 Ne5+ 49. Kf4 Nd3+ 50. Kg4 Rxd1 51. Kxh4 Rc1 52. g4 Rc4 53. b5 Rxc5 54. b6 Rc3 55. Rc7 Rb3 56. a5 Nf2 0-1

[Event "Utrecht OKU op-A"]
[Site "Utrecht"]
[Date "2004.06.04"]
[Round "?"]
[White "De Groot, Pieter"]
[Black "Bettman, Jan"]
[Result "1-0"]
[ECO "A46"]
[PlyCount "57"]
[EventDate "2004.06.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "CBM 100 Extra"]
[Source "ChessBase"]
[SourceDate "2004.07.06"]
[SourceVersion "2"]
[SourceVersionDate "2004.07.06"]
[SourceQuality "1"]

1. d4 Nf6 2. g3 Nc6 3. Nf3 h5 4. Bg2 h4 5. Nxh4 e5 6. d5 Na5 7. Qd3 b6 8. Nc3 Bb7 9. Bg5 Rh5 10. Nf3 c5 11. g4 c4 12. Qf5 Rxg5 13. Nxg5 d6 14. Nh7 Be7 15. Nxf6+ Bxf6 16. Ne4 Be7 17. Qh7 Qd7 18. g5 Bf8 19. Nc3 a6 20. g6 f5 21. e4 f4 22. Bh3 Qe7 23. Qg8 Bc8 24. Be6 Bxe6 25. dxe6 0-0-0 26. Nd5 Qb7 27. e7 Bxe7 28. Qe6+ Rd7 29. Nxe7+ 1-0

[Event "Utrecht OKU op-A"]
[Site "Utrecht"]
[Date "2000.05.21"]
[Round "6"]
[White "De Groot, Pieter"]
[Black "Van de Fliert, Willem"]
[Result "1/2-1/2"]
[ECO "D02"]
[PlyCount "6"]
[EventDate "2000.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. g3 d5 1/2-1/2

[Event "Utrecht OKU op-A"]
[Site "Utrecht"]
[Date "2000.05.21"]
[Round "5"]
[White "Van der Vegt, Seth"]
[Black "De Groot, Pieter"]
[Result "0-1"]
[ECO "A48"]
[PlyCount "136"]
[EventDate "2000.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c3 Bg7 4. Bf4 0-0 5. Nbd2 d6 6. e4 Nbd7 7. Bc4 c6 8. Bb3 a5 9. 0-0 b5 10. Re1 Nh5 11. Be3 e5 12. dxe5 dxe5 13. c4 Nf4 14. cxb5 cxb5 15. Bxf4 exf4 16. Bd5 Rb8 17. Qc2 Nb6 18. Rad1 Nxd5 19. exd5 Qxd5 20. Nb3 Qa8 21. Nfd4 Bg4 22. f3 Bd7 23. Qc7 a4 24. Nc1 Rfd8 25. Qxf4 Qa7 26. Kh1 Be8 27. Nce2 Qc5 28. b3 Be5 29. Qe4 Qc7 30. h3 axb3 31. Nxb3 Bc6 32. Qc2 Qb6 33. Nc3 Bg3 34. Re2 Rxd1+ 35. Qxd1 Rd8 36. Rd2 Re8 37. Re2 Re3 38. Rxe3 Qxe3 39. Qd8+ Be8 40. Qd2 Qe6 41. Ne4 Be5 42. f4 Bg7 43. Nbc5 Qc4 44. Kh2 Bd4 45. Nb3 Bg7 46. Nd6 Qc6 47. Nxe8 Qxe8 48. Qd3 Qb8 49. g3 Qb6 50. Qe2 h5 51. h4 Qc6 52. Kg1 b4 53. Kh2 Bf8 54. Qg2 Qc3 55. Qd2 Qf3 56. Qg2 Qd1 57. Qd2 Qb1 58. Qg2 Kh7 59. Qe2 Bg7 60. Qg2 Bc3 61. Qe2 Kg7 62. Qf2 Bb2 63. Qd2 Qxa2 64. Nc1 Qa3 65. Nd3 Bc3 66. Qc2 Bf6 67. Nxb4 Qxb4 68. Qe2 Qb2 0-1

[Event "Utrecht OKU op-A"]
[Site "Utrecht"]
[Date "2000.05.20"]
[Round "3"]
[White "De Groot, Pieter"]
[Black "Winkel, Ruud"]
[Result "0-1"]
[ECO "D06"]
[PlyCount "26"]
[EventDate "2000.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 Bf5 3. Nc3 e6 4. Qb3 Nc6 5. Nf3 Nf6 6. Qxb7 Nb4 7. Qb5+ c6 8. Qa4 Nc2+ 9. Kd1 Qc7 10. Bf4 Bd6 11. Bxd6 Qxd6 12. Rc1 Ng4 13. c5 Nxf2+ 0-1

[Event "Utrecht OKU op-A"]
[Site "Utrecht"]
[Date "2000.05.20"]
[Round "2"]
[White "Jacobs, Eric"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "D17"]
[PlyCount "41"]
[EventDate "2000.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 dxc4 5. a4 Bf5 6. Ne5 Nbd7 7. Nxc4 e6 8. f3 Nd5 9. e4 Nxc3 10. bxc3 Bxe4 11. fxe4 Qh4+ 12. Kd2 Qxe4 13. Qf3 Nf6 14. Bd3 Qd5 15. Re1 Qd7 16. Rb1 Be7 17. Ne5 Qc7 18. Nxf7 Kxf7 19. Bc4 Rhe8 20. Rxe6 Kf8 21. Ba3 1-0

[Event "Utrecht OKU op-A"]
[Site "Utrecht"]
[Date "2000.05.19"]
[Round "1"]
[White "De Groot, Pieter"]
[Black "Van Eekhout, David"]
[Result "0-1"]
[ECO "D47"]
[PlyCount "74"]
[EventDate "2000.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bb3 Bb7 9. 0-0 Bd6 10. Re1 b4 11. Ne2 0-0 12. Ng3 c5 13. Bd2 Nb6 14. Rc1 Rc8 15. dxc5 Rxc5 16. Rxc5 Bxc5 17. Qc2 Qe7 18. Rc1 Bd6 19. Nd4 Ng4 20. Nde2 Rc8 21. Qd1 Qf6 22. Rxc8+ Nxc8 23. Be1 Qxb2 24. Nd4 Nxe3 25. Qd3 Nxg2 26. Bd2 Qa1+ 27. Nf1 Nh4 28. Qb5 Qxd4 29. Qxb7 Qg4+ 30. Ng3 Nf3+ 31. Kg2 Nxd2 32. Qxc8+ Bf8 33. Bc2 Qf3+ 34. Kg1 g6 35. Qd7 Qc3 36. Bd1 Qc1 37. Qa4 b3 0-1

[Event "Utrecht Keres Memorial op"]
[Site "Utrecht"]
[Date "1999.??.??"]
[Round "5"]
[White "De Groot, Pieter"]
[Black "Dignum, Erik"]
[Result "1-0"]
[ECO "D45"]
[PlyCount "76"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. c4 c6 4. Nc3 e6 5. e3 Bd6 6. Bd3 Nbd7 7. cxd5 exd5 8. 0-0 0-0 9. a3 Re8 10. b4 a6 11. Bb2 Nf8 12. Re1 Ne4 13. Qc2 f5 14. Na4 Ng6 15. Nc5 Ra7 16. Bf1 b6 17. Nd3 Rc7 18. Rec1 Bd7 19. Nde5 c5 20. Nxd7 cxb4 21. Qb3 Rxd7 22. axb4 Nh4 23. Ne5 Bxe5 24. dxe5 Qg5 25. Qd1 f4 26. exf4 Qxf4 27. Bd4 Rf7 28. Rc2 Ng5 29. Ra3 Ne6 30. Bb2 Ref8 31. Qxd5 Qf5 32. Qd1 Rd8 33. Rd3 Rxd3 34. Qxd3 Qg4 35. Rc8+ Nf8 36. Rc4 Nf3+ 37. Qxf3 Rxf3 38. Rxg4 Rxf2 1-0

[Event "Utrecht Keres Memorial op"]
[Site "Utrecht"]
[Date "1999.??.??"]
[Round "1"]
[White "De Groot, Pieter"]
[Black "Glek, Igor Vladimirovich"]
[Result "0-1"]
[ECO "D78"]
[BlackElo "2536"]
[PlyCount "84"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 0-0 5. g3 c6 6. Bg2 d5 7. cxd5 cxd5 8. 0-0 Ne4 9. Bf4 Nxc3 10. bxc3 Nc6 11. Rb1 Na5 12. Nd2 b6 13. c4 Bb7 14. e3 Rc8 15. Rc1 Qd7 16. cxd5 Bxd5 17. Bxd5 Qxd5 18. Rc2 Rfd8 19. Rxc8 Rxc8 20. Nb3 Nc4 21. Qg4 f5 22. Qe2 h6 23. h4 a5 24. Rc1 Kh7 25. Rc2 Rc6 26. Nc1 b5 27. Nd3 b4 28. Rc1 Na3 29. Rxc6 Qxc6 30. g4 Qc4 31. gxf5 gxf5 32. h5 Nb5 33. Qf1 Nc3 34. Kh2 Nxa2 35. Qg2 Qf7 36. Qf3 a4 37. Be5 b3 38. e4 Nb4 39. Nxb4 b2 40. Qd1 Bxe5+ 41. dxe5 fxe4 42. Kg1 Qb3 0-1

[Event "Utrecht Keres Memorial op"]
[Site "Utrecht"]
[Date "1999.??.??"]
[Round "3"]
[White "De Groot, Pieter"]
[Black "Layman Sanijs, Frans J"]
[Result "1-0"]
[ECO "A49"]
[PlyCount "113"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. g3 c5 4. c3 Bg7 5. Bg2 0-0 6. 0-0 d6 7. Nbd2 Nc6 8. e4 Qc7 9. Re1 Bg4 10. Qa4 Nd7 11. h3 Bxf3 12. Nxf3 a6 13. Bf4 b5 14. Qd1 e5 15. Be3 h6 16. Qd2 Kh7 17. Rad1 Rad8 18. Qc1 f5 19. exf5 gxf5 20. Qb1 cxd4 21. cxd4 e4 22. Nh4 d5 23. Bf1 Ne7 24. Ng2 Qb6 25. Nf4 Nf6 26. Qc2 Rc8 27. Qb3 Rfd8 28. Rc1 Rc6 29. Rxc6 Nxc6 30. Rc1 Nxd4 31. Bxd4 Qxd4 32. Ne6 Qd2 33. Rd1 Qa5 34. Nxd8 Qxd8 35. a4 bxa4 36. Qxa4 a5 37. Qb5 Kg6 38. Ra1 d4 39. Rxa5 Qc8 40. Ra6 d3 41. Rc6 Qd8 42. Qb6 Qd5 43. Rd6 Qa2 44. Kg2 Qb1 45. b4 Qd1 46. Qe3 h5 47. b5 Qb3 48. b6 Bf8 49. Rc6 Qb5 50. Qc1 Qd5 51. Qc4 Qd8 52. Qg8+ Kh6 53. b7 d2 54. Be2 e3 55. Qh8+ Kg5 56. f4+ Kg6 57. Bxh5# 1-0

[Event "Utrecht Keres Memorial op"]
[Site "Utrecht"]
[Date "1999.??.??"]
[Round "4"]
[White "Konings, Frans"]
[Black "De Groot, Pieter"]
[Result "1/2-1/2"]
[ECO "C18"]
[WhiteElo "2196"]
[PlyCount "109"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Bd3 Qc7 8. Qg4 cxd4 9. Ne2 Nbc6 10. Qxg7 Rg8 11. Qxh7 Qxe5 12. Bf4 Qf6 13. Qh6 Qxh6 14. Bxh6 dxc3 15. Nxc3 Ne5 16. Nb5 Nxd3+ 17. cxd3 Kd7 18. Bf4 Nc6 19. h4 e5 20. Bg3 f5 21. h5 Rh8 22. f4 a6 23. Nc3 Ke6 24. fxe5 Nxe5 25. Kd2 Rg8 26. Ne2 Bd7 27. Nf4+ Kf7 28. Bh2 d4 29. Rhe1 Rae8 30. Rac1 Nc6 31. Rc5 Rxe1 32. Kxe1 Re8+ 33. Kd2 Be6 34. Ng6 Kf6 35. Bg3 Kg5 36. Nf4 Kg4 37. Bh2 Kg5 38. g3 Bf7 39. Bg1 Kg4 40. Ne2 Rd8 41. h6 Bg8 42. Nxd4 Nxd4 43. Bxd4 Rxd4 44. Rc8 Bh7 45. Rc7 Bg6 46. Rg7 Kh5 47. h7 Bxh7 48. Rxh7+ Kg4 49. Ke3 Ra4 50. Rg7+ Kh5 51. Rxb7 Rxa3 52. Rg7 a5 53. Kf4 Rxd3 54. Kxf5 Rf3+ 55. Ke4 1/2-1/2

[Event "Utrecht Keres Memorial op"]
[Site "Utrecht"]
[Date "1999.??.??"]
[Round "6"]
[White "L'Ami, Erwin"]
[Black "De Groot, Pieter"]
[Result "1/2-1/2"]
[ECO "C18"]
[PlyCount "124"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. h4 Nbc6 8. h5 h6 9. Qg4 Nf5 10. Bd3 Nce7 11. Qf3 c4 12. Be2 Nc6 13. g4 Nfe7 14. a4 Qa5 15. Qe3 Bd7 16. f4 0-0-0 17. Nf3 Kb8 18. Ba3 Rde8 19. Kd2 f6 20. Rhb1 fxe5 21. fxe5 Nc8 22. Nh4 N6e7 23. Rf1 Rhf8 24. Ng6 Rxf1 25. Rxf1 Nxg6 26. hxg6 Rg8 27. Rf7 Qd8 28. Qf4 Be8 29. Rf8 Rxf8 30. Bxf8 Qd7 31. Bb4 Bxg6 32. Qf8 Be8 33. g5 hxg5 34. Bg4 b6 35. a5 Qf7 36. axb6 axb6 37. Qxf7 Bxf7 38. Bf8 g6 39. Bh6 Ne7 40. Bxg5 Nc6 41. Bh4 Kb7 42. Ke3 b5 43. Kf4 b4 44. cxb4 Nxd4 45. c3 Nc6 46. Bf2 g5+ 47. Kxg5 Nxe5 48. Bd4 Nc6 49. Bc5 Ne5 50. Be2 Nd7 51. Bd4 Kc6 52. Bg4 Kd6 53. b5 e5 54. Ba7 Be6 55. Bd1 Kc7 56. Ba4 Nb6 57. Bxb6+ Kxb6 58. Kf6 Bc8 59. Kxe5 Kc5 60. Bd1 Bb7 61. Bf3 Ba8 62. b6 Bb7 1/2-1/2

[Event "Utrecht Keres Memorial op"]
[Site "Utrecht"]
[Date "1999.??.??"]
[Round "2"]
[White "Luijnenburg, Rogier R"]
[Black "De Groot, Pieter"]
[Result "1/2-1/2"]
[ECO "D13"]
[PlyCount "115"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bf4 e6 7. e3 a6 8. Rc1 Be7 9. h3 0-0 10. Bd3 Bd7 11. g4 b5 12. Ne5 Nxe5 13. dxe5 Ne8 14. 0-0 Rc8 15. a3 Nc7 16. Bg3 Na8 17. f4 Bc5 18. Bf2 Nb6 19. b4 Be7 20. e4 Bc6 21. Qe2 Bb7 22. Rfd1 Re8 23. Bb1 Na4 24. Nxa4 Rxc1 25. Rxc1 bxa4 26. Rd1 Qa8 27. Qc2 dxe4 28. Qxa4 Rd8 29. f5 exf5 30. gxf5 Qc8 31. Rxd8+ Qxd8 32. e6 fxe6 33. fxe6 Qf8 34. Qd7 Bc8 35. Qd5 Qf3 36. Qxe4 Qxe4 37. Bxe4 Bxe6 38. Bb7 Bc4 39. Bc5 Kf7 40. Kf2 Bd8 41. Ke3 Ke6 42. Kd4 Bf1 43. Be4 Kd7 44. Bb7 Bf6+ 45. Ke3 Kc7 46. Be4 Bxh3 47. Bxh7 g5 48. Bd3 Bc8 49. a4 Bb7 50. a5 Be5 51. b5 axb5 52. Bxb5 g4 53. a6 Ba8 54. Kf2 g3+ 55. Kg1 g2 56. Bf2 Kd6 57. Be2 Ke6 58. Bb5 1/2-1/2

[Event "Utrecht op"]
[Site "Utrecht"]
[Date "1998.06.05"]
[Round "1"]
[White "De Groot, Pieter"]
[Black "Vink, Nico"]
[Result "0-1"]
[ECO "E11"]
[BlackElo "2235"]
[PlyCount "92"]
[EventDate "1998.05.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Qe7 5. a3 Bxd2+ 6. Qxd2 d6 7. Nc3 0-0 8. e3 e5 9. 0-0-0 a5 10. h3 Nc6 11. g4 a4 12. Qc2 Bd7 13. g5 Ne8 14. h4 Bg4 15. Be2 exd4 16. Nxd4 Nxd4 17. Rxd4 Bxe2 18. Qxe2 f6 19. Rg1 Qf7 20. Rf4 Ra5 21. Qd3 Qe6 22. Nd5 f5 23. h5 c6 24. Nc3 Nc7 25. Rd4 Rd8 26. Rd1 Kf8 27. Ne2 Ke7 28. Nf4 Qe5 29. Qc3 Ra7 30. Nd3 Qa5 31. Nb4 Ne6 32. R4d2 Raa8 33. h6 Qe5 34. Qxe5 dxe5 35. hxg7 Rxd2 36. Rxd2 e4 37. Rd1 Rg8 38. Rh1 Rxg7 39. Nc2 c5 40. Kd2 Nxg5 41. Kc3 Nf3 42. Rh6 Kf8 43. Na1 Rd7 44. b4 Kg7 45. Rh1 Rd3+ 46. Kb2 Ne5 0-1

[Event "NED-chT 9596"]
[Site "Netherlands"]
[Date "1995.??.??"]
[Round "?"]
[White "Boesveld, Marco"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "E94"]
[WhiteElo "2240"]
[PlyCount "93"]
[EventDate "1995.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 0-0 6. Be2 c6 7. 0-0 Qc7 8. Bg5 Nbd7 9. Qd2 e5 10. b4 Re8 11. d5 c5 12. a3 Nh5 13. Nb5 Qd8 14. Rac1 a6 15. Nc3 Qc7 16. g3 Nhf6 17. Ne1 b6 18. Ng2 Nf8 19. f3 N6d7 20. Bd3 f6 21. Be3 Qd8 22. Rb1 Qe7 23. Rb2 Qf7 24. Qc2 h5 25. Na4 Nh7 26. Nxb6 Nxb6 27. bxc5 Nd7 28. cxd6 Rb8 29. c5 Rxb2 30. Qxb2 f5 31. c6 f4 32. cxd7 Qxd7 33. gxf4 Qxd6 34. Qb4 Qd7 35. fxe5 Bxe5 36. f4 Bd6 37. Qc3 Qg4 38. Qc6 Qd7 39. Qxd7 Bxd7 40. e5 Bxa3 41. Ra1 Bb2 42. Rxa6 Nf8 43. Rb6 Bc3 44. e6 Ba4 45. Nh4 Kg7 46. Rb7+ Kh6 47. Nxg6 1-0

[Event "NED-chTB 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "2"]
[White "De Groot, Pieter"]
[Black "Clemens, Adrian HP"]
[Result "1-0"]
[ECO "D16"]
[PlyCount "79"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c6 3. Nc3 d5 4. Nf3 dxc4 5. a4 Bg4 6. e3 e6 7. Bxc4 Nbd7 8. 0-0 Bd6 9. Be2 0-0 10. a5 a6 11. Bd2 Qe7 12. h3 Bh5 13. Qb3 Rab8 14. Rfe1 e5 15. Nxe5 Nxe5 16. dxe5 Qxe5 17. f4 Qe7 18. e4 Bc5+ 19. Kh2 Rbd8 20. Bc1 Bf2 21. Rf1 Nxe4 22. Rxf2 Nxf2 23. Bxh5 Qe1 24. Be2 Rfe8 25. Be3 Ng4+ 26. Bxg4 Qxe3 27. Rf1 Rd4 28. Qb6 Qd2 29. Qxb7 Rxf4 30. Qxc6 Rf8 31. Bf3 Qxb2 32. Nd5 Rd4 33. Qc5 Rd8 34. Ne7+ Kh8 35. Nc6 h6 36. Nxd4 Rxd4 37. Qc8+ Kh7 38. Qf5+ Kg8 39. Be4 Qb8+ 40. Kh1 1-0

[Event "NED-chTB 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "5"]
[White "Tondivar, Babak"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "2345"]
[PlyCount "123"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 d5 3. Bxf6 exf6 4. e3 c6 5. Bd3 Qb6 6. b3 a5 7. c3 a4 8. b4 Qc7 9. a3 Bd6 10. h3 Be6 11. Qf3 Nd7 12. Nd2 Nf8 13. c4 Qe7 14. c5 Bc7 15. Ne2 Ng6 16. g3 Qd7 17. Qg2 Bf5 18. Bxf5 Qxf5 19. Nc3 Qc2 20. Nd1 0-0 21. Qf1 Rfe8 22. Qe2 Nf8 23. Nf3 Qf5 24. Nc3 Re7 25. 0-0-0 Nd7 26. g4 Qe6 27. Qc2 b6 28. cxb6 Nxb6 29. Nd2 Bd6 30. Kb1 Qc8 31. Qd3 Re8 32. Rc1 Qb7 33. Ka2 Bf8 34. Rc2 Nc8 35. Rhc1 Nd6 36. Ne2 Rac8 37. Rb2 Nb5 38. Qc2 Qd7 39. Nb1 h5 40. Qf5 Qxf5 41. gxf5 Nd6 42. Rbc2 Nxf5 43. Rxc6 Ra8 44. Nf4 Ne7 45. Rc7 h4 46. Rd7 Rec8 47. Rxc8 Rxc8 48. Kb2 g5 49. Nxd5 Nxd5 50. Rxd5 Kg7 51. Nc3 Kg6 52. e4 Rc4 53. f3 Bxb4 54. axb4 Rxb4+ 55. Kc2 a3 56. Kd3 Rb2 57. Ra5 Rh2 58. d5 f5 59. d6 Kf6 60. Rd5 fxe4+ 61. Nxe4+ Ke6 62. d7 1-0

[Event "NED-chTB 9495"]
[Site "Netherlands"]
[Date "1994.??.??"]
[Round "4"]
[White "Van der Lijn, Nick"]
[Black "De Groot, Pieter"]
[Result "0-1"]
[ECO "D00"]
[PlyCount "110"]
[EventDate "1994.??.??"]
[EventType "team"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. Nc3 c6 3. Bg5 Bf5 4. e3 Nd7 5. Bd3 Bxd3 6. cxd3 Qb6 7. Qc2 e6 8. Nf3 Ngf6 9. 0-0 Be7 10. a3 0-0 11. b4 Rfe8 12. h3 Bf8 13. Bf4 Qd8 14. Na4 Rc8 15. Nc5 Nxc5 16. bxc5 b6 17. a4 Nd7 18. Ne5 Nxe5 19. Bxe5 f6 20. Bg3 e5 21. Rab1 bxc5 22. dxc5 Qa5 23. Rfc1 Rb8 24. Rxb8 Rxb8 25. d4 Re8 26. dxe5 fxe5 27. Qf5 Qc7 28. Kh2 Qf7 29. Qg4 Qb7 30. Qf5 Qf7 31. Qg4 Qe6 32. Qb4 Qc8 33. f4 e4 34. a5 Qa6 35. f5 Be7 36. Rb1 Qc8 37. Rc1 Bf6 38. Rb1 Be7 39. Rc1 Bg5 40. Rc3 Rf8 41. Bd6 Rf7 42. a6 h5 43. Qa4 Be7 44. Kg1 h4 45. Bxe7 Rxe7 46. Rb3 Rf7 47. Qa5 Rf8 48. Rb7 Qxf5 49. Qc7 Qg5 50. Kh2 Kh7 51. Rb2 Rf1 52. Re2 Ra1 53. g4 Rxa6 54. Kg2 Ra3 55. Qxc6 Qe5 0-1

[Event "Utrecht"]
[Site "Utrecht"]
[Date "1990.??.??"]
[Round "?"]
[White "De Groot, Pieter"]
[Black "De Haan, Eric"]
[Result "1-0"]
[ECO "D40"]
[PlyCount "77"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. e3 d5 5. Nc3 Nc6 6. a3 Be7 7. dxc5 Bxc5 8. b4 Bb6 9. Bb2 0-0 10. Bd3 dxc4 11. Bxc4 Qe7 12. 0-0 Rd8 13. Qc2 Bd7 14. Ne4 Nxe4 15. Qxe4 Rac8 16. Rac1 Bc7 17. Rfd1 e5 18. h4 h6 19. g4 Be6 20. Rxd8+ Rxd8 21. Bxe6 fxe6 22. b5 Na5 23. Nxe5 Qxh4 24. Nf3 Qe7 25. Nd4 Re8 26. Qxe6+ Qxe6 27. Nxe6 Rxe6 28. Rxc7 Rg6 29. f3 h5 30. Bc3 Nb3 31. Rxb7 hxg4 32. f4 Nc1 33. Kg2 Ne2 34. Be5 g3 35. Rxa7 Rh6 36. Rxg7+ Kf8 37. Kf3 Rh2 38. b6 Rf2+ 39. Ke4 1-0

[Event "Utrecht"]
[Site "Utrecht"]
[Date "1990.??.??"]
[Round "?"]
[White "Van Rooijen, Rene"]
[Black "De Groot, Pieter"]
[Result "0-1"]
[ECO "B95"]
[PlyCount "57"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. Be2 Qc7 8. 0-0 Be7 9. a4 Bd7 10. Kh1 Nc6 11. f4 h6 12. Bxf6 Bxf6 13. Nf3 0-0 14. Bd3 Rac8 15. g4 Nb4 16. g5 hxg5 17. Nxg5 Bxg5 18. fxg5 Nxd3 19. cxd3 b5 20. axb5 axb5 21. Rc1 Qb7 22. Qh5 b4 23. Ne2 Rxc1 24. Rxc1 Bb5 25. Nf4 Bxd3 26. Nxd3 Qxe4+ 27. Kg1 Qxd3 28. Rd1 Qc2 29. Qh3 0-1

[Event "Utrecht"]
[Site "Utrecht"]
[Date "1990.??.??"]
[Round "?"]
[White "Van der Heuvel, Peter"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "B06"]
[PlyCount "48"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 g6 3. Nc3 Bg7 4. Bc4 a6 5. Nf3 Nf6 6. Qe2 0-0 7. e5 Ne8 8. Bg5 dxe5 9. dxe5 c6 10. Rd1 Qc7 11. e6 f6 12. Rd7 Qa5 13. Bd2 Qc5 14. Na4 Qf5 15. Nb6 Nd6 16. Rxd6 Qxc2 17. 0-0 Kh8 18. Nxa8 b5 19. Bb3 Qc5 20. Rd3 Qa7 21. Be3 Qxa8 22. Rfd1 c5 23. Bxc5 Nc6 24. Bd5 Bb7 1-0

[Event "NED Open-ch16"]
[Site "Dieren"]
[Date "1985.08.08"]
[Round "9"]
[White "De Groot, Pieter"]
[Black "Storms, Laurens"]
[Result "0-1"]
[ECO "D31"]
[PlyCount "60"]
[EventDate "1985.07.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c6 4. Nc3 dxc4 5. a4 Bb4 6. e3 b5 7. Bd2 Qb6 8. Ne4 Bxd2+ 9. Qxd2 Nh6 10. Nd6+ Kd7 11. a5 Qd8 12. Qb4 Qf8 13. Ne5+ Kc7 14. Nxb5+ cxb5 15. Qxb5 Ba6 16. Qa4 Qe8 17. Qa3 Nc6 18. Qc5 f6 19. Bxc4 Bxc4 20. Nxc4 Qe7 21. Qxe7+ Nxe7 22. Ke2 Rab8 23. Rhc1 Kd7 24. Rc2 Rhc8 25. Rac1 Nhf5 26. Rc3 Nd5 27. R3c2 Nb4 28. Rd2 Nd6 29. b3 Ne4 30. Rb2 Nxf2 0-1

[Event "NED Open-ch16"]
[Site "Dieren"]
[Date "1985.08.05"]
[Round "7"]
[White "De Groot, Pieter"]
[Black "Peek, Marcel"]
[Result "0-1"]
[ECO "D32"]
[PlyCount "52"]
[EventDate "1985.07.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c5 4. cxd5 exd5 5. e3 a6 6. Be2 Nf6 7. 0-0 Nc6 8. Nc3 Bd6 9. a3 0-0 10. dxc5 Bxc5 11. Qc2 Qe7 12. Re1 Ba7 13. b3 Bg4 14. Bb2 Rac8 15. Qd1 Rfd8 16. Nd4 Ne5 17. Rc1 Bb8 18. Bxg4 Nfxg4 19. Nxd5 Qh4 20. Rxc8 Rxc8 21. h3 Qxf2+ 22. Kh1 Qg3 23. hxg4 Nxg4 24. Kg1 Qh2+ 25. Kf1 Qh1+ 26. Ke2 Qxg2+ 0-1

[Event "NED Open-ch16"]
[Site "Dieren"]
[Date "1985.08.01"]
[Round "4"]
[White "De Groot, Pieter"]
[Black "Kuijf, Hans"]
[Result "0-1"]
[ECO "D13"]
[BlackElo "2275"]
[PlyCount "45"]
[EventDate "1985.07.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 c5 3. c3 cxd4 4. cxd4 d5 5. Nc3 Nc6 6. g3 Bf5 7. Bg2 e6 8. 0-0 h6 9. a3 Be7 10. b4 0-0 11. Bb2 Nd7 12. b5 Na5 13. Nd2 Nb6 14. e4 dxe4 15. Ndxe4 Rc8 16. Bc1 Nd5 17. Ne2 b6 18. h3 Qc7 19. a4 Qc2 20. Qxc2 Rxc2 21. Nf4 Nb3 22. Rb1 Nxd4 23. Rb2 0-1

[Event "NED Open-ch16"]
[Site "Dieren"]
[Date "1985.07.31"]
[Round "3"]
[White "De Groot, Pieter"]
[Black "Hegeler, Frank"]
[Result "1-0"]
[ECO "D59"]
[PlyCount "66"]
[EventDate "1985.07.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nc3 h6 7. Bh4 b6 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Bd3 c5 11. 0-0 Nxc3 12. bxc3 Bb7 13. Qe2 Nd7 14. e4 Rfd8 15. a4 Nf6 16. Rfe1 Qc7 17. e5 Nd7 18. Nh4 Nf8 19. Rad1 Qe7 20. Qg4 cxd4 21. cxd4 Rac8 22. h3 Nh7 23. f4 Qb4 24. Bxh7+ Kxh7 25. f5 exf5 26. Nxf5 g6 27. Nd6 Rc7 28. Nxb7 Rxb7 29. d5 Qc5+ 30. Kh1 Rxd5 31. Rc1 Qd4 32. Qc8 Re7 33. Qf8 Red7 1-0

[Event "Alkmaar op-C"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Grondsma, Henk"]
[Black "De Groot, Pieter"]
[Result "1-0"]
[ECO "C32"]
[PlyCount "49"]
[EventDate "1982.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. f4 d5 3. exd5 e4 4. Bc4 Nf6 5. Ne2 c6 6. dxc6 Nxc6 7. 0-0 Bc5+ 8. Kh1 Ng4 9. Qe1 Qb6 10. d4 Bxd4 11. Nxd4 Qxd4 12. Bb3 e3 13. Qe2 0-0 14. Rf3 Nf2+ 15. Kg1 Bg4 16. Bxe3 Bxf3 17. Qxf2 Qd1+ 18. Qf1 Qxf1+ 19. Kxf1 Rfe8 20. Bf2 Be2+ 21. Kg1 Rad8 22. Nc3 a6 23. Bb6 Rd6 24. Re1 Ne7 25. Bc5 1-0

[Event "Alkmaar op-C"]
[Site "Alkmaar"]
[Date "1982.??.??"]
[Round "?"]
[White "Solowjew, W."]
[Black "De Groot, Pieter"]
[Result "0-1"]
[ECO "D30"]
[PlyCount "72"]
[EventDate "1982.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c5 4. e3 Nf6 5. b3 Nc6 6. Ba3 Qa5+ 7. Nfd2 cxd4 8. Bxf8 Rxf8 9. cxd5 exd5 10. Be2 dxe3 11. fxe3 Ne4 12. 0-0 Be6 13. a3 0-0-0 14. Qc2 Nxd2 15. Nxd2 Qc7 16. Rfb1 Qe5 17. Nf1 Bf5 18. Bd3 Bxd3 19. Qxd3 h5 20. Rc1 Kb8 21. Rd1 Qe4 22. Qc3 h4 23. h3 g5 24. Rac1 g4 25. Nd2 Qg6 26. e4 d4 27. Qd3 Ne5 28. Qb5 f6 29. Rc7 Kxc7 30. Qa5+ Kb8 31. Rc1 Rc8 32. Nc4 gxh3 33. Rc2 Nxc4 34. bxc4 Rxc4 35. Rb2 Rc1+ 36. Kf2 Qxg2# 0-1

