[Event "Cappelle op 27th"]
[Site "Cappelle la Grande"]
[Date "2011.03.02"]
[Round "6"]
[White "De Groot, Marco"]
[Black "Van Assendelft, Floris"]
[Result "0-1"]
[ECO "B42"]
[WhiteElo "2081"]
[BlackElo "2337"]
[PlyCount "78"]
[EventDate "2011.02.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "FRA"]
[SourceTitle "CBM 141 Extra"]
[Source "ChessBase"]
[SourceDate "2011.05.03"]
[SourceVersion "1"]
[SourceVersionDate "2011.05.03"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5 6. Nb3 Be7 7. Nc3 d6 8. 0-0 Nf6 9. f4 Nbd7 10. Be3 b5 11. a3 Bb7 12. Kh1 Rc8 13. Qe1 0-0 14. Qg3 e5 15. Rad1 Nh5 16. Qh3 exf4 17. Bc1 g6 18. Be2 Ng7 19. Bxf4 Qc7 20. e5 d5 21. e6 Ne5 22. Nxd5 Bxd5 23. Rxd5 fxe6 24. Bxe5 Qxc2 25. Rd2 Rxf1+ 26. Bxf1 Rf8 27. Qd3 Qxb3 28. Rd1 Qxd3 29. Bxd3 Rd8 30. Be2 Rxd1+ 31. Bxd1 Ne8 32. Be2 Bf6 33. Bxf6 Nxf6 34. a4 bxa4 35. Bxa6 Ne4 36. Kg1 Kf7 37. Kf1 Kf6 38. Ke2 Ke5 39. Bb5 a3 0-1

[Event "Cappelle op 27th"]
[Site "Cappelle la Grande"]
[Date "2011.02.28"]
[Round "4"]
[White "De Groot, Marco"]
[Black "Bernard, Christophe"]
[Result "0-1"]
[ECO "B53"]
[WhiteElo "2081"]
[BlackElo "2348"]
[PlyCount "86"]
[EventDate "2011.02.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "FRA"]
[SourceTitle "CBM 141 Extra"]
[Source "ChessBase"]
[SourceDate "2011.05.03"]
[SourceVersion "1"]
[SourceVersionDate "2011.05.03"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Bd7 6. Bxc6 Bxc6 7. Nc3 e6 8. Bg5 Nf6 9. 0-0-0 Be7 10. Rhe1 0-0 11. e5 dxe5 12. Qh4 Qc7 13. Nxe5 Rfe8 14. Rd3 Nd5 15. Bxe7 Qxe7 16. Qxe7 Nxe7 17. Nxc6 Nxc6 18. Nb5 Re7 19. a4 Kf8 20. c3 a6 21. Na3 Rc8 22. Red1 Rec7 23. Nc4 Nb4 24. Rd8+ Rxd8 25. Rxd8+ Ke7 26. Rd4 Nd3+ 27. Kd2 Nc5 28. Rh4 Nxa4 29. Ne3 b5 30. Rxh7 Nxb2 31. Rxg7 Na4 32. Nd1 Nc5 33. Rg8 a5 34. Kc2 Ne4 35. f3 Nxc3 36. Nxc3 b4 37. h4 Rxc3+ 38. Kd2 a4 39. Rg4 Rb3 40. Kc2 f5 41. Rc4 Kf6 42. g4 fxg4 43. fxg4 Rc3+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.30"]
[Round "7"]
[White "De Groot, Marco"]
[Black "Van Drunick, Jan Willem"]
[Result "1/2-1/2"]
[ECO "C01"]
[WhiteElo "2082"]
[BlackElo "1919"]
[PlyCount "54"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4 Bb4+ 5. Nc3 Qe7+ 6. Be2 dxc4 7. Nf3 Nf6 8. 0-0 0-0 9. Bg5 c6 10. Ne5 Nbd7 11. Nxc4 h6 12. Bd2 Nb6 13. Re1 Qd8 14. Qb3 Be7 15. Nxb6 Qxb6 16. Qxb6 axb6 17. Bf3 Be6 18. Bf4 Rfe8 19. Re2 Bc4 20. Re3 Bb4 21. a3 Rxe3 22. Bxe3 Bxc3 23. bxc3 Ra5 24. h4 Rb5 25. a4 Rb3 26. Bd2 Rb2 27. Bf4 Nd5 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.23"]
[Round "6"]
[White "De Groot, Marco"]
[Black "Termeulen, Albert"]
[Result "0-1"]
[ECO "B09"]
[WhiteElo "2082"]
[BlackElo "2061"]
[PlyCount "40"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 6. dxc5 Qa5 7. Qd4 0-0 8. cxd6 exd6 9. Bd2 Nc6 10. Qc4 Be6 11. Qb5 Qc7 12. Nd5 Bxd5 13. exd5 Rfe8+ 14. Be2 a6 15. Qb3 Na5 16. Qd3 Nc4 17. Bc3 Re3 18. Qd1 Rae8 19. Ng1 Rxc3 20. bxc3 Ne4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.16"]
[Round "5"]
[White "De Mooij, Marco"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "B08"]
[WhiteElo "1902"]
[BlackElo "2082"]
[PlyCount "68"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Be3 a6 5. Nf3 Nf6 6. a4 b6 7. Bc4 0-0 8. Qd2 Bb7 9. h4 Bxe4 10. Ng5 Bxg2 11. Rh2 d5 12. Be2 Be4 13. Ncxe4 dxe4 14. h5 Qd5 15. f3 e5 16. hxg6 hxg6 17. c4 Qd6 18. d5 exf3 19. Bxf3 e4 20. Bf4 e3 21. Qxe3 Qb4+ 22. Qc3 Re8+ 23. Re2 Rxe2+ 24. Kxe2 Qc5 25. Be5 Nbd7 26. Bd4 Re8+ 27. Kd2 Qd6 28. Rg1 Qf4+ 29. Kc2 Ne5 30. Re1 Qf5+ 31. Kb3 Nfd7 32. Qd2 Bh6 33. Be3 Nxf3 34. Nxf3 Qxf3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.09"]
[Round "4"]
[White "De Groot, Marco"]
[Black "Hellenberg, Jan Amerik"]
[Result "1/2-1/2"]
[ECO "C17"]
[WhiteElo "2082"]
[BlackElo "2010"]
[PlyCount "92"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 Nc6 6. Nb5 Bxd2+ 7. Qxd2 Nxd4 8. Nxd4 cxd4 9. Nf3 Ne7 10. Bd3 Bd7 11. Nxd4 Nc6 12. Qe3 Qb6 13. c3 Nxd4 14. cxd4 Qb4+ 15. Ke2 Rc8 16. Rab1 Bb5 17. Rhc1 0-0 18. Bxb5 Qxb5+ 19. Qd3 Qb6 20. Rc3 Rc6 21. Kf1 Rfc8 22. h4 Rc4 23. g3 R8c6 24. Rb3 Qa6 25. Kg2 b5 26. a4 b4 27. Qd1 Qb6 28. Rd3 a5 29. b3 Rc2 30. Qg4 R6c3 31. Rbd1 Rxd3 32. Rxd3 Rc3 33. Qe2 h6 34. Qd2 Qc6 35. Re3 Rxe3 36. Qxe3 Qc3 37. Kf3 Qc2 38. Kg2 Qd1 39. Kh3 h5 40. Kg2 Kh7 41. Kh2 Qc2 42. Kg2 Qf5 43. Qf3 Kg6 44. Qe2 Qg4 45. Qd3+ Qf5 46. Qe2 Qg4 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2009.06.02"]
[Round "3"]
[White "Weiland, Harro"]
[Black "De Groot, Marco"]
[Result "1/2-1/2"]
[ECO "A57"]
[WhiteElo "1944"]
[BlackElo "2082"]
[PlyCount "55"]
[EventDate "2009.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. f3 e6 5. e4 bxc4 6. Na3 exd5 7. exd5 d6 8. Bxc4 Nfd7 9. Ne2 Ne5 10. 0-0 Nxc4 11. Nxc4 Be7 12. Bf4 0-0 13. Qd2 Ba6 14. Rac1 Re8 15. Rfe1 Bxc4 16. Rxc4 Nd7 17. Nc3 Rb8 18. Re2 f5 19. Nd1 g5 20. Bxg5 Ne5 21. Bxe7 Qxe7 22. Rc2 Rb4 23. Ne3 Qg5 24. Kf1 Rh4 25. Nc4 Qxd2 26. Nxd2 Rb8 27. Nb1 Rxh2 28. Kg1 1/2-1/2

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.17"]
[Round "9"]
[White "De Groot, Marco"]
[Black "Van der Lende, Ilias"]
[Result "0-1"]
[ECO "C17"]
[WhiteElo "2157"]
[BlackElo "1978"]
[PlyCount "56"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 Nh6 6. Bxh6 gxh6 7. Nf3 Bd7 8. Be2 cxd4 9. Qxd4 Nc6 10. Qf4 a6 11. 0-0 Be7 12. a4 Qb6 13. Nd1 Qb4 14. Qxh6 0-0-0 15. h3 Rhg8 16. Bd3 Nd4 17. Ne1 Nf5 18. Bxf5 exf5 19. Ra3 Be6 20. Rc3+ Kb8 21. Rb3 Qa5 22. Rd3 d4 23. b3 Qxe5 24. Nf3 Qc5 25. Qf4+ Bd6 26. Qd2 Bd5 27. c3 Qc6 28. Kh1 Rxg2 0-1

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.16"]
[Round "8"]
[White "Croese, Cornelis"]
[Black "De Groot, Marco"]
[Result "1/2-1/2"]
[ECO "B34"]
[WhiteElo "2363"]
[BlackElo "2157"]
[PlyCount "69"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 cxd4 5. Nxd4 Nc6 6. Nde2 Nf6 7. g3 b5 8. Bg2 Ng4 9. 0-0 Rb8 10. h3 Nge5 11. f4 Nc4 12. Kh1 Qa5 13. e5 0-0 14. b3 Na3 15. Nd5 d6 16. exd6 exd6 17. c3 Bf5 18. Ne3 Bd7 19. Qxd6 Rfd8 20. Qxa3 Qxa3 21. Bxa3 b4 22. Bb2 Re8 23. Rf3 bxc3 24. Bxc3 Bxc3 25. Nxc3 Nd4 26. Ned5 Nxf3 27. Nf6+ Kg7 28. Nxe8+ Rxe8 29. Rd1 Bc6 30. Rf1 Re3 31. Nd1 Rd3 32. Nb2 Rc3 33. Nd1 Rd3 34. Nf2 Rc3 35. Nd1 1/2-1/2

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.15"]
[Round "7"]
[White "Rubingh, Otto"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "A57"]
[WhiteElo "2267"]
[BlackElo "2157"]
[PlyCount "47"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. a4 bxc4 5. Nc3 d6 6. e4 e6 7. Bxc4 Ba6 8. Bb5+ Bxb5 9. axb5 exd5 10. Nxd5 Nxd5 11. Qxd5 Nd7 12. Ra6 Be7 13. Ne2 0-0 14. Nc3 Nb6 15. Qa2 Qd7 16. 0-0 Bf6 17. Bf4 Rfe8 18. h3 Bxc3 19. bxc3 Rxe4 20. Rxb6 Rxf4 21. Qd5 Rd8 22. Rb7 Qe8 23. Rxa7 Qe4 24. Rd7 0-1

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.14"]
[Round "6"]
[White "De Groot, Marco"]
[Black "Lathouwers, Rob"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2157"]
[BlackElo "2214"]
[PlyCount "59"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 Qc7 7. Qd2 e5 8. Nb3 Be7 9. f3 Be6 10. g4 h6 11. Rg1 Nbd7 12. h4 Nc5 13. 0-0-0 Nxb3+ 14. axb3 Nd7 15. f4 exf4 16. Bxf4 Ne5 17. Nd5 Bxd5 18. Bxe5 dxe5 19. exd5 Bxh4 20. d6 Qd7 21. Qd5 Bf6 22. Bd3 0-0 23. g5 Bxg5+ 24. Rxg5 hxg5 25. Rh1 g6 26. Qxe5 f6 27. Qh2 Qg7 28. Bc4+ Rf7 29. d7 Rd8 30. Re1 1-0

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.13"]
[Round "5"]
[White "Klein, David"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "2135"]
[BlackElo "2157"]
[PlyCount "79"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Be3 a6 5. a4 Nd7 6. Nf3 b6 7. Bc4 Bb7 8. Ng5 e6 9. Bxe6 fxe6 10. Nxe6 Qe7 11. Nxc7+ Kd8 12. Nxa8 Bxa8 13. Qe2 Bb7 14. 0-0 Ngf6 15. f3 h6 16. a5 b5 17. Nb1 Re8 18. Nd2 Nd5 19. c3 g5 20. Rfe1 Nxe3 21. Qxe3 d5 22. e5 Nf8 23. b3 Ne6 24. Nf1 h5 25. Qd2 Rf8 26. Rad1 Rf4 27. Qb2 Bf8 28. Ng3 Qf7 29. Ne2 Rf5 30. c4 b4 31. c5 Bc6 32. Qd2 Qb7 33. Qd3 Rf7 34. Qg6 Qe7 35. Ng3 Be8 36. Nf5 Qd7 37. Nd6 Bxd6 38. exd6 Nf4 39. Qxg5+ Kc8 40. c6 1-0

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.12"]
[Round "4"]
[White "De Groot, Marco"]
[Black "Polak, Indra"]
[Result "1/2-1/2"]
[ECO "B53"]
[WhiteElo "2157"]
[BlackElo "2172"]
[PlyCount "35"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Bd7 6. Bxc6 Bxc6 7. Nc3 Nf6 8. Bg5 e6 9. 0-0-0 Be7 10. Rd3 0-0 11. Rhd1 Qc7 12. e5 dxe5 13. Qxe5 Rac8 14. Qxc7 Rxc7 15. Ne5 Ng4 16. Bxe7 Nxe5 17. Bxf8 Nxd3+ 18. Rxd3 1/2-1/2

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.11"]
[Round "3"]
[White "Rombaldoni, Andrea"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2219"]
[BlackElo "2157"]
[PlyCount "69"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nge2 Nf6 5. g3 0-0 6. Bg2 e5 7. h3 c6 8. a4 Nbd7 9. 0-0 Qc7 10. Be3 exd4 11. Bxd4 b6 12. g4 Bb7 13. Ng3 Nc5 14. f4 Rad8 15. g5 Ne8 16. Nce2 d5 17. e5 Ne6 18. Be3 c5 19. Bc1 Ba6 20. Rf2 d4 21. Ra3 c4 22. Ne4 d3 23. cxd3 cxd3 24. N2g3 Nd4 25. Bd2 Ne2+ 26. Kh2 Bxe5 27. fxe5 Qxe5 28. Bc3 Nxc3 29. Rxc3 Ng7 30. Qe1 Kh8 31. Rd2 Nf5 32. Qf2 Rd4 33. Kh1 Bb7 34. Nxf5 Bxe4 35. Qxd4 1-0

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.10"]
[Round "2"]
[White "De Groot, Marco"]
[Black "Overeem, Marc"]
[Result "0-1"]
[ECO "B18"]
[WhiteElo "2157"]
[BlackElo "2288"]
[PlyCount "104"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Bd3 Qxd4 7. N1e2 Qd6 8. Nf4 Nf6 9. Nxg6 hxg6 10. 0-0 Nbd7 11. Qe2 0-0-0 12. Rd1 Qc7 13. Be3 Kb8 14. c4 e6 15. Bc2 Bc5 16. Bxc5 Nxc5 17. b4 Ncd7 18. Rab1 c5 19. h3 cxb4 20. Rxb4 Nc5 21. Rdb1 Rd7 22. Qf3 Rh4 23. Ba4 Rd6 24. Qe3 b6 25. Bd1 Rhd4 26. Bf3 Rd3 27. Qg5 e5 28. Rb5 Kc8 29. Qh4 e4 30. Be2 Rd2 31. Qh8+ Rd8 32. Qxg7 Qe7 33. Qh6 Rxa2 34. R5b2 Rxb2 35. Rxb2 Qe5 36. Ra2 a5 37. Qc1 Kc7 38. Qb1 Rd6 39. Nf1 Nd3 40. Ne3 Nxf2 41. c5 bxc5 42. Rxa5 Nd7 43. Ra7+ Kd8 44. Qb7 Qd4 45. Ra8+ Ke7 46. Qc8 Nd3 47. Qd8+ Ke6 48. Bg4+ f5 49. Qe8+ Kf6 50. Qh8+ Kg5 51. h4+ Kf4 52. Kh2 Qxh8 0-1

[Event "Haarlem BDO-B"]
[Site "Haarlem"]
[Date "2008.08.09"]
[Round "1"]
[White "Duchene, Rene"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "E92"]
[WhiteElo "2221"]
[BlackElo "2157"]
[PlyCount "119"]
[EventDate "2008.08.09"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 125 Extra"]
[Source "ChessBase"]
[SourceDate "2008.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2008.09.01"]
[SourceQuality "1"]

1. Nf3 g6 2. c4 Bg7 3. Nc3 d6 4. e4 Nf6 5. d4 0-0 6. Be2 e5 7. d5 a5 8. Bg5 h6 9. Bh4 Qe8 10. Nd2 Na6 11. 0-0 Bd7 12. Kh1 Nc5 13. Qc2 Nh7 14. Nb5 Qb8 15. f3 f5 16. b3 Nf6 17. a3 Nh5 18. b4 Bxb5 19. bxc5 Ba6 20. cxd6 cxd6 21. Rfe1 Qc7 22. Bf2 Qe7 23. Rab1 Nf4 24. Bf1 Rac8 25. Qa4 Qg5 26. Be3 Qh5 27. Rb6 Rfd8 28. Qxa5 Bf6 29. Qb4 Bh4 30. Rc1 Bg3 31. Bg1 Rc5 32. Rxd6 Rdc8 33. Rd8+ Rxd8 34. Qxc5 Qh4 35. Rb1 Be1 36. Qe3 Bg3 37. exf5 Nh5 38. fxg6 Bf4 39. Ne4 Bxe3 40. Bxe3 Kg7 41. g3 Qe7 42. Bc5 Qd7 43. Bd3 Rc8 44. Bd6 Re8 45. Rb6 Qa4 46. Nc5 Qd1+ 47. Kg2 Qd2+ 48. Kh3 Qe3 49. Be4 Qg1 50. Rb1 Qf2 51. Nxa6 bxa6 52. Rb7+ Kg8 53. Rf7 Ng7 54. c5 Qf1+ 55. Kh4 Qg2 56. Rxg7+ Kxg7 57. h3 Qd2 58. g4 h5 59. c6 hxg4 60. fxg4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.26"]
[Round "7"]
[White "Van Vliet, Harry"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "C45"]
[WhiteElo "2033"]
[BlackElo "2064"]
[PlyCount "48"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qf6 5. Be3 Bc5 6. c3 Nge7 7. g3 d5 8. Bg2 Bxd4 9. cxd4 dxe4 10. Nc3 Bf5 11. 0-0 0-0-0 12. d5 Nxd5 13. Nxd5 Qe5 14. Nb6+ axb6 15. Qa4 Qa5 16. Qb3 Be6 17. Qc2 f5 18. Rfc1 h6 19. a3 g5 20. Bf1 Qe5 21. Qa4 Kb8 22. Bb5 Na5 23. Re1 f4 24. Bc1 Rd4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.19"]
[Round "6"]
[White "Van der Hoeven, Peter"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "A57"]
[WhiteElo "1647"]
[BlackElo "2064"]
[PlyCount "76"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. Qc2 bxc4 5. e4 d6 6. Bxc4 g6 7. Nf3 Nbd7 8. Nc3 Bg7 9. a3 0-0 10. 0-0 Ng4 11. Bg5 Nde5 12. Nxe5 Nxe5 13. Be2 Rb8 14. h3 c4 15. Rfd1 Ba6 16. Rd2 Rb3 17. Kh1 Qb6 18. Be3 Qb7 19. Ra2 Nd3 20. Nd1 Rb8 21. Bxd3 Rxd3 22. Rxd3 cxd3 23. Qa4 Rc8 24. Ra1 Be5 25. Rc1 Kg7 26. Rxc8 Qxc8 27. Bd4 Qc2 28. Bxe5+ dxe5 29. Nc3 Qxa4 30. Nxa4 d2 31. Nc3 Be2 32. b4 d1Q+ 33. Nxd1 Bxd1 34. Kg1 f5 35. Kf1 Bc2 36. exf5 gxf5 37. f3 Bb3 38. b5 Ba4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.12"]
[Round "5"]
[White "De Groot, Marco"]
[Black "Van Vliet, Jeffrey"]
[Result "0-1"]
[ECO "B41"]
[WhiteElo "2064"]
[BlackElo "2226"]
[PlyCount "58"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Be2 Nf6 6. Qd3 Nc6 7. Nc3 Qc7 8. Nxc6 bxc6 9. Bg5 d5 10. Rd1 Be7 11. h4 h6 12. Bc1 Bb7 13. Qf3 Rd8 14. e5 Qxe5 15. Bf4 Qf5 16. Bd3 Qg4 17. Qxg4 Nxg4 18. f3 Nf6 19. g4 Nd7 20. Kf2 Nc5 21. Be2 h5 22. Rdg1 hxg4 23. Rxg4 g6 24. Be5 f6 25. Bc7 Rc8 26. Ba5 Kf7 27. Rhg1 Nd7 28. Na4 Rcg8 29. Rh1 f5 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.06.05"]
[Round "4"]
[White "Van der Maat, Niek"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "A58"]
[WhiteElo "1749"]
[BlackElo "2064"]
[PlyCount "68"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. Nf3 Bg7 8. g3 d6 9. Bg2 Nbd7 10. Rb1 0-0 11. 0-0 Qa5 12. Bd2 Rfb8 13. Qc2 Ne8 14. a4 c4 15. Na2 Qc5 16. Be3 Qc7 17. Bd4 Nef6 18. b4 Nxd5 19. Bxg7 Kxg7 20. Ne5 Nxe5 21. Bxd5 Bb7 22. Bxb7 Rxb7 23. f4 Qb6+ 24. Kh1 Qc6+ 25. Kg1 Qxa4 26. Qc3 Qa7+ 27. Kh1 Qxa2 28. fxe5 d5 29. e6+ f6 30. Qf3 Rb5 31. Rbd1 Ra3 32. Qg4 Re3 33. Ra1 Qxe2 34. Qxe2 Rxe2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.29"]
[Round "3"]
[White "De Groot, Marco"]
[Black "Coene, Igor"]
[Result "0-1"]
[ECO "C45"]
[WhiteElo "2064"]
[BlackElo "2108"]
[PlyCount "70"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Nxd4 6. Bxd4 Bxd4 7. Qxd4 Qf6 8. c3 d6 9. Be2 Qg6 10. 0-0 Ne7 11. Nd2 0-0 12. f4 Nc6 13. Qd5 Be6 14. Qb5 Bd7 15. Qb3 b5 16. Qd5 b4 17. Rf3 Qh6 18. Bc4 Rab8 19. Raf1 bxc3 20. Rxc3 Rxb2 21. Bb3 Nb4 22. Qd4 c5 23. Rxc5 dxc5 24. Qxb2 Nd3 25. Qc3 Nxf4 26. Qf3 Ne6 27. Qf2 Qg6 28. Bd5 Nd4 29. Nc4 Be6 30. Ne5 Qh5 31. Bxe6 Nxe6 32. Qf5 Qxf5 33. exf5 Nd4 34. Nd7 Rc8 35. Rd1 Rd8 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.22"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "A25"]
[WhiteElo "1921"]
[BlackElo "2064"]
[PlyCount "54"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 e5 3. Bg2 Nc6 4. Nc3 Bb4 5. Nd5 a5 6. a3 Bc5 7. e3 d6 8. Ne2 Bg4 9. Qb3 Nxd5 10. cxd5 a4 11. Qb5 Ra5 12. Qc4 Bxe2 13. Qxe2 Ne7 14. d3 Qd7 15. Bd2 Rb5 16. Bc3 Bb6 17. e4 0-0 18. f4 exf4 19. gxf4 Re8 20. Qh5 Nxd5 21. Bh3 Qe7 22. Bd2 Rxb2 23. Qxd5 Qh4+ 24. Kd1 Qxh3 25. Kc1 c6 26. Qc4 Rb5 27. Bb4 Be3+ 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2007.05.15"]
[Round "1"]
[White "De Groot, Marco"]
[Black "Van Dorp, Teun"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "2064"]
[BlackElo "1723"]
[PlyCount "51"]
[EventDate "2007.05.15"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 f5 3. Nc3 d6 4. Nf3 Be7 5. Bd3 c6 6. 0-0 Nf6 7. Re1 0-0 8. exf5 exf5 9. d5 c5 10. Ng5 Na6 11. Qe2 Nxd5 12. Ne6 Nxc3 13. bxc3 Qd7 14. Nxf8 Bxf8 15. Bf4 Nc7 16. a4 Kh8 17. Bb5 Qf7 18. Rad1 h6 19. Bxd6 Bxd6 20. Rxd6 a6 21. Rd8+ Kh7 22. Bc4 Qf6 23. Qe7 Qxc3 24. Bg8+ Kg6 25. Bf7+ Kh7 26. Rh8+ 1-0

[Event "Haarlem Nova College op"]
[Site "Haarlem"]
[Date "2006.07.09"]
[Round "6"]
[White "Sprangers, Remco"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "B07"]
[WhiteElo "2138"]
[BlackElo "1940"]
[PlyCount "104"]
[EventDate "2006.07.07"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. e4 g6 2. d4 d6 3. Nc3 Nf6 4. Bg5 c6 5. Bd3 Nbd7 6. Nge2 Bg7 7. Qd2 h6 8. Bh4 Qc7 9. 0-0 e5 10. a4 Nh5 11. dxe5 dxe5 12. f3 0-0 13. Bf2 Rd8 14. Be3 Kh7 15. g4 Nf4 16. Nxf4 exf4 17. Bxf4 Ne5 18. Kh1 Qb6 19. a5 Qxb2 20. Rfb1 Rxd3 21. cxd3 Qxd2 22. Bxd2 Nxf3 23. Ra3 Nxd2 24. Rd1 Nf3 25. h3 Be6 26. Rb1 Rd8 27. Na4 Bc8 28. Kg2 Nd4 29. Ra2 Bf8 30. Rf2 Kg7 31. Nc3 Nb5 32. Nxb5 cxb5 33. Rxb5 Rxd3 34. Rc2 Be6 35. Rxb7 Re3 36. Rxa7 Rxe4 37. Rd2 Ra4 38. Ra8 Bb4 39. Rd4 Rxa5 40. Rxa5 Bxa5 41. Rd6 Kf6 42. Rd3 Ke5 43. Rd1 Bd5+ 44. Kf2 f5 45. gxf5 gxf5 46. Rb1 Bc3 47. Rb5 Ke4 48. Kg3 f4+ 49. Kg4 Be6+ 50. Kh4 Be1+ 51. Kh5 Bxh3 52. Rb7 Kf3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.27"]
[Round "7"]
[White "De Groot, Marco"]
[Black "Landheer, Ronald"]
[Result "1-0"]
[ECO "C43"]
[WhiteElo "1940"]
[PlyCount "67"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4 d5 6. exd6 Nxd6 7. Bg5 f6 8. Bf4 Be6 9. Bd3 Be7 10. 0-0 0-0 11. Re1 Nc6 12. Qe3 Bf7 13. Nc3 Re8 14. Nd2 Qd7 15. Nde4 b6 16. Rad1 a6 17. Qg3 Kh8 18. Nxd6 Bxd6 19. Rxe8+ Bxe8 20. Bxd6 Qxd6 21. Qh3 h6 22. Qf5 g6 23. Qh3 Qf8 24. Nd5 Qg7 25. Qe6 f5 26. Bc4 Nd4 27. Qe3 Nb5 28. Nf4 Nd6 29. Bd5 Rc8 30. Ne6 f4 31. Qxf4 g5 32. Qf3 Qxb2 33. c3 Kh7 34. Qf6 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.20"]
[Round "6"]
[White "Huizer, Olivier"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "1712"]
[BlackElo "1940"]
[PlyCount "45"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 g6 2. d4 d6 3. f4 Nf6 4. e5 dxe5 5. fxe5 Ng4 6. Bc4 c5 7. Qf3 Qxd4 8. Bxf7+ Kd8 9. Ne2 Qxe5 10. h3 Bh6 11. Nbc3 Ne3 12. Bxe3 Bxe3 13. Nd5 Bh6 14. Rd1 Nd7 15. 0-0 e6 16. Ndf4 Ke7 17. Bxe6 Rf8 18. Bxd7 Bxd7 19. Rxd7+ Ke8 20. Qxb7 Qe3+ 21. Kh1 Rxf4 22. Nxf4 Bxf4 23. Rxh7 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.06.06"]
[Round "4"]
[White "De Groot, Marco"]
[Black "Van 't Hof, Eric"]
[Result "0-1"]
[ECO "C71"]
[WhiteElo "1940"]
[BlackElo "2115"]
[PlyCount "56"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. h3 Bd7 6. d4 b5 7. Bb3 Nxd4 8. Nxd4 exd4 9. Nd2 Nf6 10. Nf3 Be7 11. 0-0 0-0 12. Re1 c5 13. a4 Bc6 14. e5 dxe5 15. Nxe5 Bb7 16. c4 b4 17. a5 Rc8 18. Bf4 Bd6 19. Qd3 Nh5 20. Bc2 f5 21. Bd2 Qc7 22. Bd1 Be4 23. Qb3 Bxe5 24. Bxh5 g6 25. Bf3 Rce8 26. Kh1 Qc6 27. Qd3 Bc7 28. Bh6 Qd6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.30"]
[Round "3"]
[White "De Groot, Marco"]
[Black "Zwinkels, Wim"]
[Result "1-0"]
[ECO "B91"]
[WhiteElo "1940"]
[BlackElo "1910"]
[PlyCount "69"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. g3 e5 7. Nb3 Be6 8. Bg2 Be7 9. 0-0 0-0 10. a4 b6 11. h3 Nc6 12. Kh2 Nb4 13. f4 Rc8 14. Rf2 Qc7 15. Be3 Rfd8 16. Rd2 g6 17. Qg1 Nd7 18. Nd5 Bxd5 19. exd5 exf4 20. gxf4 a5 21. Nd4 Bf6 22. c3 Na6 23. Nc6 Re8 24. Bf1 Nac5 25. Rg2 Bg7 26. Bb5 Re4 27. Rf1 Rce8 28. Bd4 Nb3 29. Bxg7 Kxg7 30. f5 Nf6 31. Bd3 Rxa4 32. fxg6 hxg6 33. Rxf6 Kxf6 34. Rxg6+ fxg6 35. Qxg6# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.23"]
[Round "2"]
[White "Ruijgrok, Dennis"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "2265"]
[BlackElo "1940"]
[PlyCount "77"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 g6 2. Nc3 d6 3. g3 Bg7 4. Bg2 Nf6 5. Nge2 0-0 6. 0-0 c5 7. h3 Nc6 8. f4 Nd7 9. g4 Nd4 10. Ng3 b5 11. e5 Rb8 12. exd6 e6 13. Nce4 Bb7 14. c3 Nc6 15. d3 b4 16. f5 exf5 17. gxf5 bxc3 18. bxc3 Nce5 19. d4 cxd4 20. cxd4 Qb6 21. f6 Bh8 22. Kh2 Bxe4 23. Nxe4 Nc4 24. Qd3 Rbc8 25. Rb1 Qc6 26. Bf4 Qd5 27. Bg3 Nde5 28. Qe2 Nc6 29. Rfd1 Rce8 30. Qd3 N4a5 31. Rb5 Qxa2 32. d5 Ne5 33. Qc3 Nac4 34. Rc5 Rb8 35. Bxe5 Rb2 36. Rg1 Rc2 37. Qd4 Re8 38. d7 Rd8 39. Rc8 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2006.05.16"]
[Round "1"]
[White "De Groot, Marco"]
[Black "Heshusius, Hans"]
[Result "1-0"]
[ECO "C14"]
[WhiteElo "1940"]
[BlackElo "1433"]
[PlyCount "57"]
[EventDate "2006.05.16"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6 Bxf6 6. Nf3 Nd7 7. exd5 exd5 8. Nxd5 0-0 9. Be2 c6 10. Ne3 Nb6 11. c4 Be6 12. 0-0 Re8 13. Qd2 Qc7 14. Rfd1 Rac8 15. a4 c5 16. a5 Na8 17. d5 Bd7 18. Ra3 Qd6 19. Bd3 Nc7 20. Bf5 Red8 21. Qc2 g6 22. Bxd7 Rxd7 23. Ng4 Ne8 24. Re3 Rdd8 25. Rde1 Kf8 26. Nfe5 Kg7 27. Rg3 h5 28. Nh6 Bxe5 29. Nf5+ 1-0

[Event "Dieren op reserve-A"]
[Site "Dieren"]
[Date "2005.07.29"]
[Round "4"]
[White "Burg, Brent"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B07"]
[PlyCount "73"]
[EventDate "2005.07.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 g6 2. d4 d6 3. Nc3 Nf6 4. f3 c6 5. Be3 Nbd7 6. Qd2 Qa5 7. h4 h5 8. Nge2 b5 9. Nf4 Rb8 10. a3 b4 11. Na2 c5 12. Nd3 cxd4 13. Bxd4 Bh6 14. Qd1 bxa3+ 15. Nc3 Qc7 16. Rxa3 a5 17. Nd5 Nxd5 18. exd5 Rg8 19. Bc3 Ra8 20. Nf2 Bb7 21. Ne4 f5 22. Ng5 Bxg5 23. hxg5 Qc5 24. Qd2 a4 25. Rh4 Qxd5 26. Bc4 Qxd2+ 27. Kxd2 d5 28. Bb5 Bc8 29. Bc6 Ra6 30. Bxd5 Rd6 31. Rd4 Rxd5 32. Rxd5 Nb6 33. Rc5 Kf7 34. Ba5 Nd7 35. Rc7 Ne5 36. Re3 Rd8+ 37. Ke1 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.07.07"]
[Round "7"]
[White "De Groot, Marco"]
[Black "De Leur, Ben"]
[Result "1-0"]
[ECO "B39"]
[WhiteElo "1947"]
[BlackElo "1971"]
[PlyCount "113"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 Ng4 8. Qxg4 Nxd4 9. Qd1 e5 10. Nb5 0-0 11. Bd3 Nxb5 12. cxb5 d6 13. 0-0 d5 14. exd5 Qxd5 15. b3 Bg4 16. f3 e4 17. Bxe4 Qxe4 18. fxe4 Bxd1 19. Raxd1 Rfe8 20. Bd4 Bf8 21. Rfe1 Bb4 22. Re2 Rad8 23. Kf2 Bc3 24. Ke3 f5 25. e5 Bxd4+ 26. Rxd4 Rxe5+ 27. Kf3 Rxd4 28. Rxe5 Kf7 29. Rc5 Rd7 30. Ke2 Kf6 31. a4 Re7+ 32. Kd3 g5 33. a5 f4 34. b4 g4 35. Rc8 f3 36. gxf3 gxf3 37. Rf8+ Rf7 38. Rxf7+ Kxf7 39. Ke3 Ke6 40. Kxf3 Kd5 41. Kg4 Kc4 42. a6 b6 43. Kh5 Kxb4 44. Kh6 Kxb5 45. Kxh7 Kxa6 46. Kg6 b5 47. Kf5 Kb6 48. h4 Kc5 49. h5 b4 50. Ke4 Kc4 51. Ke3 Kc3 52. h6 b3 53. h7 b2 54. h8Q+ Kc2 55. Qh7+ Kc3 56. Qd3+ Kb4 57. Kd2 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.04"]
[Round "6"]
[White "De Groot, Marco"]
[Black "Hoff, Pim H"]
[Result "1-0"]
[ECO "B17"]
[PlyCount "53"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Ng5 Ngf6 6. Bd3 e6 7. N1f3 Be7 8. Qe2 Nb6 9. 0-0 0-0 10. c3 h6 11. Ne4 Nbd7 12. Ne5 Re8 13. Bf4 Nf8 14. Rad1 Nxe4 15. Qxe4 Bg5 16. Bxg5 Qxg5 17. f4 Qd8 18. Qf3 Qc7 19. Qg3 c5 20. Ng4 Ng6 21. Bxg6 fxg6 22. Ne5 b6 23. Qxg6 Ba6 24. Rfe1 Re7 25. Re3 Rf8 26. Rg3 Rf6 27. Qxf6 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.04"]
[Round "5"]
[White "Perez Garcia, Hebert"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B24"]
[WhiteElo "2188"]
[PlyCount "69"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 e6 6. Be3 Nd4 7. Nce2 Ne7 8. c3 Nxe2 9. Nxe2 d6 10. Qd2 Rb8 11. Bh6 0-0 12. h4 Qc7 13. h5 Nc6 14. Bxg7 Kxg7 15. f4 f5 16. g4 b5 17. hxg6 hxg6 18. gxf5 exf5 19. 0-0-0 Be6 20. Rdg1 Rh8 21. Ng3 Kf7 22. exf5 gxf5 23. Nxf5 Bxf5 24. Bd5+ Kf6 25. Rxh8 Rxh8 26. Qg2 Rh5 27. Bxc6 d5 28. Qxd5 Qxf4+ 29. Kb1 Qb8 30. Ka1 Bg6 31. Qf3+ Rf5 32. Qg4 Bf7 33. Qg7+ Ke6 34. Re1+ Re5 35. Rf1 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.03"]
[Round "3"]
[White "De Groot, Marco"]
[Black "Schol Grin, Anneke"]
[Result "1-0"]
[ECO "B18"]
[PlyCount "59"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. f4 e6 7. Nf3 Nd7 8. Bd3 Be7 9. 0-0 Ngf6 10. f5 exf5 11. Bxf5 0-0 12. Bg5 Nd5 13. Bxe7 Nxe7 14. Bxd7 Qxd7 15. Qd2 Rad8 16. Rae1 Qd6 17. c3 c5 18. Qg5 Nd5 19. Ne4 Bxe4 20. Rxe4 Nf6 21. Re2 cxd4 22. Nxd4 Qb6 23. Kh1 Rxd4 24. cxd4 Qxd4 25. Qe5 Qh4 26. Qe7 Qh6 27. Rd1 g5 28. Rd6 Kg7 29. Rf2 Rc8 30. Qxf6+ 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.02"]
[Round "1"]
[White "De Groot, Marco"]
[Black "Vlug, Arthur"]
[Result "1-0"]
[ECO "C78"]
[PlyCount "65"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Be7 7. d4 exd4 8. e5 Ne4 9. Re1 Nc5 10. Nxd4 Nxd4 11. Qxd4 Nxb3 12. axb3 Bb7 13. Nc3 c5 14. Qg4 Qb6 15. Ne4 0-0-0 16. Bd2 Qc6 17. Qg3 h5 18. b4 h4 19. Qc3 f5 20. exf6 gxf6 21. bxc5 Rdg8 22. Bf4 Rg4 23. g3 Rhg8 24. Kf1 hxg3 25. hxg3 f5 26. Nd6+ Bxd6 27. cxd6 Qxc3 28. bxc3 R4g7 29. Re5 Rf8 30. Ke2 Rh7 31. c4 Kb8 32. cxb5 axb5 33. Rxb5 1-0

[Event "Haarlem Nova College op 3rd"]
[Site "Haarlem"]
[Date "2004.07.02"]
[Round "2"]
[White "Pliester, Leon"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "2389"]
[PlyCount "111"]
[EventDate "2004.07.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 101 Extra"]
[Source "ChessBase"]
[SourceDate "2004.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2004.09.01"]
[SourceQuality "1"]

1. d4 g6 2. e4 Bg7 3. Nf3 d6 4. Nc3 Nf6 5. Be2 0-0 6. 0-0 c5 7. dxc5 dxc5 8. Qxd8 Rxd8 9. Be3 b6 10. Rad1 Nc6 11. Rxd8+ Nxd8 12. Rd1 Bb7 13. Nd2 Ne6 14. f3 Rd8 15. Nb3 Rxd1+ 16. Nxd1 Nh5 17. Bc4 Nd4 18. c3 Nxb3 19. Bxb3 Kf8 20. Nf2 Nf6 21. Nh3 e6 22. Ba4 Ke7 23. Kf2 h6 24. Ke1 Nd7 25. Nf2 f5 26. Bc2 Ne5 27. Bc1 Nf7 28. Ke2 Ba6+ 29. Bd3 Bxd3+ 30. Kxd3 Ne5+ 31. Ke2 g5 32. f4 gxf4 33. Bxf4 Nd7 34. h3 e5 35. Bd2 Ke6 36. exf5+ Kxf5 37. g4+ Ke6 38. Ne4 Kd5 39. Ng3 Bf8 40. Nf5 h5 41. gxh5 Ke6 42. Ng3 c4 43. Ne4 Kf5 44. Kf3 Bc5 45. h4 Be7 46. Bg5 Bf8 47. Ng3+ Ke6 48. h6 Nc5 49. Ne4 Nd3 50. h7 Bg7 51. Bf6 Kf7 52. h8Q Bxh8 53. Bxh8 Ke6 54. h5 Kf5 55. Nd6+ Kg5 56. Nxc4 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.30"]
[Round "6"]
[White "Geertsma, Folkert Jan"]
[Black "De Groot, Marco"]
[Result "0-1"]
[ECO "A29"]
[WhiteElo "1931"]
[BlackElo "1947"]
[PlyCount "36"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 Bb4 5. Bg2 0-0 6. 0-0 Bxc3 7. bxc3 Re8 8. d3 e4 9. Nd4 d5 10. cxd5 Qxd5 11. Nxc6 Qxc6 12. Qd2 Bf5 13. Bb2 Qd7 14. d4 Ng4 15. Bxe4 Bxe4 16. f3 Bc6 17. fxg4 Qxg4 18. Rf4 Rxe2 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.23"]
[Round "5"]
[White "De Groot, Marco"]
[Black "Bakker, Joop"]
[Result "1-0"]
[ECO "C62"]
[WhiteElo "1947"]
[BlackElo "1879"]
[PlyCount "109"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. 0-0 Bd7 5. Re1 Nf6 6. d4 Nxd4 7. Nxd4 exd4 8. Bxd7+ Qxd7 9. Qxd4 Be7 10. Bg5 0-0 11. Nc3 Qg4 12. Be3 Rfe8 13. h3 Qh4 14. e5 Qxd4 15. Bxd4 dxe5 16. Bxe5 c6 17. Rad1 Rad8 18. Kf1 Rxd1 19. Rxd1 Rd8 20. Rxd8+ Bxd8 21. Ke2 Kf8 22. Kd3 Nd7 23. Bd4 Bb6 24. Ne4 Bxd4 25. Kxd4 Ke7 26. c4 Nf8 27. b4 Ne6+ 28. Ke3 f5 29. Nd2 Kd6 30. f4 c5 31. b5 Nd4 32. Nf3 Nxf3 33. Kxf3 Kc7 34. g4 fxg4+ 35. Kxg4 Kd6 36. Kf5 b6 37. a4 Ke7 38. h4 Kf7 39. Ke5 Kg6 40. Kd6 Kh5 41. Kc7 Kxh4 42. Kb7 Kg4 43. Kxa7 h5 44. a5 h4 45. axb6 h3 46. b7 h2 47. b8Q h1Q 48. Qe5 Qh7 49. b6 g5+ 50. b7 gxf4 51. Ka8 Qc2 52. b8Q Qa4+ 53. Qa7 Qc6+ 54. Qb7 Qa4+ 55. Kb8 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.09"]
[Round "4"]
[White "Fructuoso, Vincent"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B38"]
[WhiteElo "2106"]
[BlackElo "1947"]
[PlyCount "77"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 Nf6 5. Nf3 0-0 6. Be2 c5 7. 0-0 cxd4 8. Nxd4 Nc6 9. Be3 Bd7 10. Rc1 Rc8 11. b3 Qc7 12. h3 Nxd4 13. Bxd4 Bc6 14. Nd5 Bxd5 15. exd5 e5 16. dxe6 fxe6 17. Bg4 Nxg4 18. Qxg4 e5 19. Be3 Rf5 20. Rcd1 Re8 21. Qe4 Bf8 22. Rd5 b6 23. Rfd1 Qf7 24. a4 Rf6 25. a5 Qb7 26. axb6 axb6 27. f3 Rf7 28. Rb5 Rb8 29. Ra1 Kg7 30. Qh4 Ra8 31. Rxa8 Qxa8 32. Rxb6 Qa1+ 33. Kh2 Qb1 34. Bh6+ Kg8 35. Rb8 Qf5 36. Qd8 e4 37. Qxf8+ Rxf8 38. Rxf8+ Qxf8 39. Bxf8 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.06.02"]
[Round "3"]
[White "De Groot, Marco"]
[Black "Van der Laan, Dinard"]
[Result "0-1"]
[ECO "B01"]
[WhiteElo "1947"]
[BlackElo "2201"]
[PlyCount "91"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 Nc6 2. Nf3 d5 3. exd5 Qxd5 4. Nc3 Qa5 5. d3 e5 6. Be2 Nf6 7. 0-0 Be7 8. Be3 Nd5 9. Nxd5 Qxd5 10. d4 e4 11. c4 Qd6 12. Ne1 0-0 13. f3 Bf5 14. fxe4 Bxe4 15. Bf3 Bxf3 16. Nxf3 Bf6 17. d5 Ne5 18. Nd2 Be7 19. Bd4 f5 20. Qe2 Ng4 21. Nf3 Rae8 22. Qd3 Bf6 23. Rae1 Bxd4+ 24. Qxd4 Re4 25. c5 Qg6 26. Qd3 Rfe8 27. h3 Ne3 28. Rf2 Nxg2 29. Rxg2 Rxe1+ 30. Kh2 Qf6 31. Nxe1 Rxe1 32. Qg3 Qe5 33. Qxe5 Rxe5 34. Rd2 Kf7 35. Kg3 g5 36. Kf2 Ke7 37. b4 Kd7 38. b5 h6 39. Kf3 Re8 40. c6+ bxc6 41. dxc6+ Kc8 42. Rd5 f4 43. Kg4 Rf8 44. Rd3 a6 45. a4 Kb8 46. Rf3 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2004.05.19"]
[Round "1"]
[White "Ruijgrok, Dennis"]
[Black "De Groot, Marco"]
[Result "1-0"]
[ECO "B50"]
[WhiteElo "2171"]
[BlackElo "1947"]
[PlyCount "95"]
[EventDate "2004.05.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. h3 e6 5. Bd3 Be7 6. 0-0 Qc7 7. Bc2 b6 8. d4 Bb7 9. Re1 Nbd7 10. Na3 Rd8 11. Qe2 a6 12. e5 dxe5 13. dxe5 Nd5 14. Bg5 Nxc3 15. bxc3 Bxf3 16. Qxf3 Bxg5 17. Qg3 Bh6 18. f4 b5 19. Rad1 0-0 20. Rd6 c4 21. Nb1 Nb6 22. Rd2 Rd5 23. Rf2 g6 24. Nd2 Rxd2 25. Rxd2 Nd5 26. Rd4 Qc5 27. Kh1 b4 28. f5 exf5 29. Qh4 Ne3 30. Qxh6 Nxc2 31. Rh4 Re8 32. Qxh7+ Kf8 33. Qh8+ Ke7 34. Qf6+ Kd7 35. Qxf7+ Re7 36. Rd1+ Kc7 37. Rxc4 Rxf7 38. Rxc5+ Kb6 39. e6 Re7 40. Re5 bxc3 41. Rd3 Nb4 42. Rxc3 Nc6 43. Re1 Kc7 44. Kh2 Kd6 45. Kg3 Nb4 46. Ra3 Kd5 47. Kf4 Rxe6 48. Rxe6 1-0

