[Event "Groninger Combinatie op"]
[Site "Groningen"]
[Date "2022.05.28"]
[Round "4"]
[White "De Groot, Hendrik"]
[Black "Maatman, Nick"]
[Result "0-1"]
[ECO "A05"]
[WhiteElo "2129"]
[BlackElo "2363"]
[PlyCount "68"]
[EventDate "2022.05.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d3 d5 3. g3 b6 4. Bg2 Bb7 5. c4 dxc4 6. Qa4+ Nbd7 7. Qxc4 e6 8. 0-0 Bd6 9. Nc3 a6 10. a4 0-0 11. Bg5 h6 12. Bxf6 Nxf6 13. e4 Rc8 14. Rfe1 Nd7 15. d4 c6 16. e5 Be7 17. Rad1 b5 18. Qb3 Qb6 19. Rd2 b4 20. Nd1 c5 21. Ne3 Bxf3 22. Bxf3 cxd4 23. Nc4 Qc5 24. Rc2 Qa7 25. Na5 Nc5 26. Qc4 d3 27. Rd2 Qb6 28. Nb3 Bg5 29. Rdd1 Nxa4 30. Qxd3 Nxb2 31. Qd6 Qxd6 32. Rxd6 Rc3 33. Nd4 Be7 34. Rc6 Bc5 0-1

[Event "Utrecht Keres Memorial"]
[Site "Utrecht"]
[Date "2022.05.27"]
[Round "1"]
[White "De Groot, Hendrik"]
[Black "Lammers, Anton"]
[Result "1/2-1/2"]
[ECO "D46"]
[WhiteElo "2129"]
[BlackElo "1864"]
[PlyCount "109"]
[EventDate "2022.05.27"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 208 Extra"]
[Source "ChessBase"]
[SourceDate "2022.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2022.07.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. b3 b6 7. Bd3 Bd6 8. Bb2 Bb7 9. 0-0 0-0 10. Rc1 Re8 11. Qe2 h6 12. Rfd1 Qe7 13. cxd5 Nxd5 14. Nxd5 cxd5 15. Rc2 Rac8 16. Rdc1 Nb8 17. Ne5 Bxe5 18. dxe5 Rxc2 19. Rxc2 Rc8 20. Rxc8+ Bxc8 21. Qc2 Qd7 22. Ba3 Ba6 23. Bxa6 Nxa6 24. Bd6 Qb7 25. h3 Nb8 26. Qc7 Qxc7 27. Bxc7 Nc6 28. Kf1 Kf8 29. Ke2 Ke8 30. Bd6 f6 31. f4 fxe5 32. fxe5 Kf7 33. Kf3 b5 34. a3 Kg6 35. Kg4 d4 36. exd4 Nxd4 37. Bc5 Nc6 38. Bd6 a6 39. a4 Nd4 40. axb5 axb5 41. b4 Kf7 42. Kf4 Kg6 43. Bf8 Kf7 44. Bd6 g6 45. Ke4 Nc6 46. Kf4 g5+ 47. Ke4 h5 48. g3 Kg6 49. Bf8 g4 50. hxg4 hxg4 51. Bd6 Kg5 52. Bc5 Nb8 53. Be7+ Kg6 54. Bd6 Nd7 55. Be7 1/2-1/2

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.30"]
[Round "9"]
[White "Rut, Vojtech"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "2140"]
[BlackElo "2128"]
[PlyCount "7"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 1/2-1/2

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.29"]
[Round "8"]
[White "De Groot, Hendrik"]
[Black "Hilwerda, Jonas"]
[Result "0-1"]
[ECO "A09"]
[WhiteElo "2128"]
[BlackElo "2128"]
[PlyCount "62"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 d4 3. e3 Nc6 4. d3 e5 5. Be2 Bb4+ 6. Nbd2 dxe3 7. fxe3 Nf6 8. 0-0 0-0 9. a3 Bc5 10. Nb3 Bd6 11. e4 a5 12. Bg5 Be7 13. a4 b6 14. Qd2 Nd7 15. Bxe7 Qxe7 16. d4 exd4 17. Nfxd4 Nxd4 18. Qxd4 Bb7 19. Rae1 Rad8 20. Qc3 Qe5 21. c5 Qxc3 22. bxc3 Bxe4 23. Bc4 Rde8 24. cxb6 Nxb6 25. Rf4 Bc6 26. Rxe8 Bxe8 27. Nxa5 Nxa4 28. Bb3 Nxc3 29. Rc4 Nb5 30. Nc6 Bxc6 31. Rxc6 Nd4 0-1

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.28"]
[Round "7"]
[White "Baselmans, Luuk"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B09"]
[WhiteElo "2191"]
[BlackElo "2128"]
[PlyCount "63"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 6. Bb5+ Bd7 7. e5 Ng4 8. e6 fxe6 9. Ng5 Bxb5 10. Nxe6 Bxd4 11. Nxb5 Qa5+ 12. Qd2 Bf2+ 13. Kd1 Ne3+ 14. Ke2 Qxb5+ 15. Kxf2 Ng4+ 16. Kg3 Qd7 17. Re1 Nf6 18. b3 Qc6 19. Bb2 Kd7 20. Qe2 Kc8 21. Ng7 Nbd7 22. Qxe7 Nd5 23. Qe4 Rf8 24. Rad1 Nxf4 25. Qxc6+ bxc6 26. Rxd6 Kc7 27. Rd2 Rf7 28. Rf2 g5 29. Kg4 Raf8 30. Rd2 Nf6+ 31. Bxf6 Rxf6 32. Ne8+ 1-0

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.27"]
[Round "6"]
[White "De Groot, Hendrik"]
[Black "Simet, Martin"]
[Result "1/2-1/2"]
[ECO "A13"]
[WhiteElo "2128"]
[BlackElo "2229"]
[PlyCount "70"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ c6 6. Qxc4 b5 7. Qc2 Bb7 8. 0-0 Be7 9. Nc3 a6 10. d4 Nbd7 11. e4 c5 12. e5 Nd5 13. Nxd5 Bxd5 14. dxc5 Bxc5 15. Bg5 Qb6 16. a3 h6 17. Bf4 g5 18. Bd2 Qb7 19. Ne1 Bxg2 20. Nxg2 Rc8 21. Bc3 Bd4 22. Qe2 Bxc3 23. bxc3 Rxc3 24. Rfc1 Qc7 25. Qe3 Rc4 26. a4 0-0 27. axb5 axb5 28. Rxc4 bxc4 29. Ra7 Qc6 30. h4 Qd5 31. hxg5 Nxe5 32. Nf4 Nf3+ 33. Kg2 Nh4+ 34. Kh2 Nf3+ 35. Kg2 Nh4+ 1/2-1/2

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.26"]
[Round "5"]
[White "Sparenberg, Erik"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "D79"]
[WhiteElo "2215"]
[BlackElo "2128"]
[PlyCount "48"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 Nf6 3. Bg2 g6 4. 0-0 Bg7 5. d4 0-0 6. c4 c6 7. cxd5 cxd5 8. Nc3 Nc6 9. Ne5 Be6 10. Bf4 Rc8 11. Nxc6 Rxc6 12. Be5 Qa5 13. a3 Rfc8 14. Qd2 Ne8 15. e4 Bxe5 16. exd5 Bxd5 17. Bxd5 Rxc3 18. Bxb7 Rxg3+ 19. hxg3 Qxd2 20. Bxc8 Bxd4 21. Bg4 Qg5 22. Bf3 Qxg3+ 23. Bg2 Nf6 24. Rad1 Ng4 0-1

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.24"]
[Round "4"]
[White "Wedda, Dries"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "A55"]
[WhiteElo "2208"]
[BlackElo "2128"]
[PlyCount "59"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. d4 d6 2. Nf3 Nd7 3. c4 e5 4. Nc3 Be7 5. e4 Ngf6 6. g3 0-0 7. Bg2 a5 8. 0-0 exd4 9. Nxd4 Nc5 10. h3 Re8 11. Re1 c6 12. b3 Bf8 13. a3 Bd7 14. Rb1 Qb6 15. Bg5 Be7 16. Be3 Qc7 17. b4 axb4 18. axb4 Ra3 19. Nde2 Ne6 20. f4 Nf8 21. Ra1 Rxa1 22. Qxa1 h5 23. c5 dxc5 24. bxc5 Qc8 25. f5 Bd8 26. Bd4 Bc7 27. Bxf6 gxf6 28. Nf4 h4 29. Nh5 Be5 30. Qc1 1-0

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.23"]
[Round "3"]
[White "De Groot, Hendrik"]
[Black "Duson, Robin"]
[Result "1-0"]
[ECO "A39"]
[WhiteElo "2128"]
[BlackElo "1951"]
[PlyCount "59"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c5 3. g3 Nc6 4. Bg2 g6 5. 0-0 Bg7 6. d4 cxd4 7. Nxd4 0-0 8. Nc3 Nxd4 9. Qxd4 d6 10. Qh4 Re8 11. Rd1 a6 12. c5 Qa5 13. cxd6 exd6 14. h3 Nd7 15. Bd2 g5 16. Qh5 Nf6 17. Qxg5 Re5 18. Qf4 Nh5 19. Qf3 Rf5 20. Qd3 Qe5 21. e4 Rf6 22. Nd5 Rg6 23. Bc3 Qg5 24. Bxg7 Kxg7 25. Rac1 Be6 26. Rc7 b5 27. h4 Qd8 28. Qc3+ Kf8 29. Ne7 Rg7 30. e5 1-0

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.23"]
[Round "2"]
[White "Zwirs, Nico"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2414"]
[BlackElo "2128"]
[PlyCount "81"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. f3 d5 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. c4 e6 8. cxd5 exd5 9. Nc3 cxd4 10. Nxd4 Bb4 11. Nc2 Bxc3+ 12. bxc3 Nb6 13. Bd3 Qh4+ 14. g3 Qg4 15. Be2 Qh3 16. Ba3 Bf5 17. Ne3 Be4 18. Bg4 Qh6 19. 0-0 Qg6 20. Bh5 Qe6 21. Bd6 g6 22. Be2 f5 23. a4 Kf7 24. a5 Nc8 25. Bc5 b6 26. axb6 Nxb6 27. Ra6 Nb8 28. Ra3 N8d7 29. Bd6 a5 30. Qd4 Rhc8 31. Rb3 Nc4 32. Nxc4 dxc4 33. Rb5 Kg7 34. Ra1 Nb8 35. Bxb8 Rcxb8 36. Bxc4 Qc6 37. Rc5 Qb6 38. Qd6 Qa7 39. Raxa5 Rb1+ 40. Kf2 Qb8 41. Rxa8 1-0

[Event "Groningen op 56th"]
[Site "Groningen"]
[Date "2018.12.22"]
[Round "1"]
[White "De Groot, Hendrik"]
[Black "Grooten, Herman"]
[Result "0-1"]
[ECO "A30"]
[WhiteElo "2128"]
[BlackElo "2374"]
[PlyCount "66"]
[EventDate "2018.12.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 188 Extra"]
[Source "ChessBase"]
[SourceDate "2019.02.26"]
[SourceVersion "1"]
[SourceVersionDate "2019.02.26"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c5 3. g3 b6 4. Bg2 Bb7 5. 0-0 e6 6. Nc3 Be7 7. b3 a6 8. Bb2 0-0 9. e3 Ra7 10. Qe2 d6 11. Rfd1 Nbd7 12. d4 Qa8 13. d5 exd5 14. cxd5 b5 15. e4 Re8 16. a4 b4 17. Nb1 Bf8 18. Qd3 Nxe4 19. Nbd2 Ndf6 20. Nc4 Bxd5 21. Bxf6 Nxf6 22. Nb6 Be4 23. Nxa8 Bxd3 24. Rxd3 Raxa8 25. Rad1 Ne4 26. Nd2 Nc3 27. Bxa8 Nxd1 28. Bb7 Re1+ 29. Kg2 Nb2 30. Rf3 Rd1 31. Ne4 d5 32. Ng5 f6 33. Ne6 c4 0-1

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.13"]
[Round "6"]
[White "De Groot, Hendrik"]
[Black "Pel, Bonno"]
[Result "0-1"]
[ECO "B08"]
[WhiteElo "2140"]
[BlackElo "2248"]
[PlyCount "80"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. h3 a6 6. a4 0-0 7. Be3 b6 8. Bd3 Nc6 9. 0-0 Bb7 10. Qd2 e5 11. d5 Nb4 12. Bc4 a5 13. Ne1 Nd7 14. Nb5 f5 15. f3 Nf6 16. c3 Na6 17. Qc2 Kh8 18. Nd3 Qe7 19. Nf2 Nh5 20. Rfb1 Ng3 21. b4 Bc8 22. bxa5 f4 23. Bd2 bxa5 24. Rb2 h5 25. Be1 g5 26. Qd1 Rf6 27. Rab1 Rg6 28. Na3 g4 29. Bxa6 Bxa6 30. Rb8+ Rxb8 31. Rxb8+ Kh7 32. Rb2 Ne2+ 33. Rxe2 gxf3 34. Rd2 Rxg2+ 35. Kh1 Qg5 36. Ng4 hxg4 37. Rxg2 fxg2+ 38. Kxg2 gxh3+ 39. Kxh3 Bf1+ 40. Kh2 Qg2# 0-1

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.13"]
[Round "7"]
[White "Seijen, Henk G"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "1806"]
[BlackElo "2140"]
[PlyCount "102"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 Bg7 5. f3 0-0 6. Qd2 e5 7. dxe5 dxe5 8. 0-0-0 Qxd2+ 9. Rxd2 Be6 10. Bb5 Nbd7 11. Nge2 c6 12. Ba4 Nb6 13. Bb3 Nc4 14. Bxc4 Bxc4 15. Rhd1 b5 16. Kb1 a5 17. Nc1 Rfc8 18. Nd3 Nd7 19. Nc5 Nxc5 20. Bxc5 Be6 21. Be7 f6 22. Rd8+ Kf7 23. Rxc8 Rxc8 24. Bc5 a4 25. a3 h5 26. Na2 Rc7 27. Nb4 Rd7 28. Rxd7+ Bxd7 29. Kc1 Bh6+ 30. Kd1 Ke8 31. Ke2 Be6 32. b3 axb3 33. cxb3 Kd7 34. a4 Bxb3 35. a5 Bc4+ 36. Kd1 Kc7 37. a6 Be6 38. a7 Kb7 39. Nxc6 Bd7 40. Nb4 f5 41. Nd5 Bc6 42. Ne7 Bf8 43. Nxc6 Bxc5 44. Nxe5 fxe4 45. fxe4 g5 46. Nd3 Bxa7 47. Kc2 Kc6 48. Kb3 Bb8 49. h3 Bd6 50. g4 hxg4 51. hxg4 Be7 1/2-1/2

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.12"]
[Round "5"]
[White "De Groot, Hendrik"]
[Black "Huizinga, Egbert"]
[Result "1-0"]
[ECO "A09"]
[WhiteElo "2140"]
[BlackElo "1772"]
[PlyCount "73"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 d4 3. e3 Nc6 4. d3 e5 5. a3 a5 6. Be2 Nf6 7. 0-0 Bc5 8. exd4 exd4 9. Re1 0-0 10. Bg5 h6 11. Bh4 Bf5 12. Qb3 b6 13. Nbd2 Qd6 14. Bg3 Qd7 15. Bh4 Qd6 16. Bg3 Qd7 17. h3 Rfe8 18. Bf1 Bd6 19. Bxd6 Qxd6 20. g4 Bg6 21. Nh4 Bh7 22. Bg2 Rad8 23. Nf1 g5 24. Nf3 Nd7 25. Rxe8+ Rxe8 26. Rd1 Nc5 27. Qb5 Re7 28. b4 axb4 29. axb4 Ne6 30. Ng3 Nf4 31. Nxg5 hxg5 32. Qxg5+ Ng6 33. Nf5 Qxb4 34. Bxc6 Re2 35. Qf6 Qf8 36. Bd5 Re5 37. Bxf7+ 1-0

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.12"]
[Round "4"]
[White "Maatman, Nick"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "A80"]
[WhiteElo "2354"]
[BlackElo "2140"]
[PlyCount "63"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. d4 d6 2. Nf3 f5 3. b3 Nf6 4. Bb2 g6 5. e3 Bg7 6. Be2 0-0 7. 0-0 c6 8. Nbd2 Ne4 9. c4 Nd7 10. Qc2 Ndf6 11. Bd3 Nxd2 12. Nxd2 Qe8 13. Rae1 Nh5 14. f3 e5 15. c5 d5 16. e4 fxe4 17. fxe4 Rxf1+ 18. Bxf1 exd4 19. Nf3 dxe4 20. Rxe4 Qf8 21. Ng5 h6 22. Bc4+ Kh8 23. Nf7+ Kh7 24. Nd6 Bf5 25. Nxf5 Qxf5 26. g4 Qg5 27. Bc1 Qh4 28. gxh5 Qxh5 29. Bd3 Rf8 30. b4 Be5 31. Qe2 Bxh2+ 32. Kg2 1-0

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.11"]
[Round "3"]
[White "De Groot, Hendrik"]
[Black "Waskowsky, Gregor"]
[Result "1-0"]
[ECO "A09"]
[WhiteElo "2140"]
[BlackElo "1497"]
[PlyCount "19"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 Bf5 3. cxd5 Qxd5 4. Nc3 Qd8 5. e4 Bg6 6. Qb3 Qc8 7. h4 h5 8. Ne5 Nh6 9. d4 Bh7 10. Bxh6 1-0

[Event "Groningen Combinatie op"]
[Site "Groningen"]
[Date "2018.05.10"]
[Round "1"]
[White "Konnen, Timo"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "B07"]
[WhiteElo "1888"]
[BlackElo "2140"]
[PlyCount "60"]
[EventDate "2018.05.10"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. d4 d6 2. e4 Nf6 3. Nc3 g6 4. Be3 a6 5. Qd2 b5 6. f3 Bg7 7. Bh6 0-0 8. h4 e5 9. d5 c5 10. g4 Nbd7 11. h5 Qe7 12. Bxg7 Kxg7 13. hxg6 fxg6 14. Nh3 Ra7 15. 0-0-0 c4 16. Ne2 Nc5 17. Ng3 Qc7 18. Ng5 Na4 19. Nxh7 Nxh7 20. Qh6+ Kg8 21. Qxg6+ Qg7 22. Qxd6 Rxf3 23. Nh5 Qe7 24. Qg6+ Kh8 25. Kb1 c3 26. Be2 Qb4 27. Qe8+ Rf8 28. Qxe5+ Kg8 29. Nf6+ Rxf6 30. Qe8+ Rf8 0-1

[Event "NED-chT 1718"]
[Site "Netherlands"]
[Date "2018.03.10"]
[Round "7.3"]
[White "Van de Oudeweetering, Arthur"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B09"]
[WhiteElo "2294"]
[BlackElo "2140"]
[PlyCount "99"]
[EventDate "2017.09.16"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2019"]
[Source "ChessBase"]
[SourceDate "2018.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2018.10.10"]
[SourceQuality "1"]
[WhiteTeam "Apeldoorn"]
[BlackTeam "SISSA"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 6. dxc5 Qa5 7. Bd3 Qxc5 8. Qe2 0-0 9. Be3 Qb4 10. 0-0 Qxb2 11. Nb5 Ne8 12. Rfb1 Qxa1 13. Rxa1 Bxa1 14. c3 a6 15. Na3 b5 16. Qd2 Bb7 17. Qc1 b4 18. cxb4 Bg7 19. Nc4 d5 20. exd5 Bxd5 21. Nfe5 Bxe5 22. Nxe5 Nd6 23. Qc7 Re8 24. a4 f6 25. Ng4 Nf7 26. Qc5 Be6 27. Be4 Nd7 28. Qc2 Rac8 29. Qe2 f5 30. Bb7 fxg4 31. Bxc8 Rxc8 32. Qxa6 Nd6 33. Qe2 Bf5 34. Bc5 Ne4 35. Qc4+ Kg7 36. Qd4+ Kh6 37. Kf1 Ndxc5 38. bxc5 Rxc5 39. Qd8 Rc1+ 40. Ke2 Rc2+ 41. Kf1 Rc1+ 42. Ke2 Nc3+ 43. Kf2 Rc2+ 44. Kf1 Kh5 45. a5 Be4 46. Qh8 Bxg2+ 47. Kg1 g3 48. Qxh7+ Kg4 49. Qxg6+ Kf3 50. Qd3+ 1-0

[Event "NED-chT 1718"]
[Site "Netherlands"]
[Date "2018.02.03"]
[Round "6.9"]
[White "De Groot, Hendrik"]
[Black "Kossen, Johannes"]
[Result "0-1"]
[ECO "D78"]
[WhiteElo "2140"]
[BlackElo "1975"]
[PlyCount "100"]
[EventDate "2017.09.16"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2019"]
[Source "ChessBase"]
[SourceDate "2018.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2018.10.10"]
[SourceQuality "1"]
[WhiteTeam "SISSA"]
[BlackTeam "En Passant"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. Nf3 d5 2. c4 c6 3. g3 Nf6 4. Bg2 g6 5. 0-0 Bg7 6. b3 Ne4 7. d4 Nd7 8. Bb2 0-0 9. Nfd2 Nxd2 10. Nxd2 Nf6 11. a4 Bf5 12. f3 Re8 13. e4 dxe4 14. fxe4 Bg4 15. Qc2 e5 16. dxe5 Nd7 17. e6 Bxe6 18. Bxg7 Kxg7 19. Qc3+ Kg8 20. Rf2 Qc7 21. Nf3 Bg4 22. Raf1 Bxf3 23. Rxf3 Ne5 24. Rf4 Rad8 25. c5 Rd3 26. Qc2 Qd7 27. R4f2 Qd4 28. Kh1 Re7 29. Rf6 Rc3 30. Rd6 Rxc2 31. Rxd4 Rxc5 32. b4 Rc2 33. Bf3 Nxf3 34. Rxf3 Re2 35. Rf4 g5 36. Rf5 h6 37. b5 R7xe4 38. Rxe4 Rxe4 39. bxc6 bxc6 40. Ra5 Re7 41. Kg2 Kf8 42. Kf3 Rc7 43. Rc5 Ke7 44. Ke3 Kd6 45. Rf5 Ke6 46. Ra5 f6 47. Kd4 c5+ 48. Kc4 h5 49. h3 Ke5 50. Ra6 h4 0-1

[Event "NED-chT 1718"]
[Site "Netherlands"]
[Date "2017.11.04"]
[Round "3.10"]
[White "De Groot, Hendrik"]
[Black "De Groote, Ewoud"]
[Result "1-0"]
[ECO "A13"]
[WhiteElo "2140"]
[BlackElo "2291"]
[PlyCount "55"]
[EventDate "2017.09.16"]
[EventType "team-tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2019"]
[Source "ChessBase"]
[SourceDate "2018.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2018.10.10"]
[SourceQuality "1"]
[WhiteTeam "SISSA"]
[BlackTeam "BSG"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. Nf3 Nf6 2. c4 e6 3. g3 d5 4. Bg2 a6 5. 0-0 dxc4 6. Qc2 b5 7. Ne5 Nd5 8. a4 Bb7 9. b3 Nb4 10. Qc3 Bxg2 11. Kxg2 Qd5+ 12. f3 f6 13. Ng4 cxb3 14. axb5 axb5 15. e4 Qb7 16. Rxa8 Qxa8 17. Nxf6+ Kf7 18. Ng4 N8c6 19. Ba3 Qa7 20. Bxb4 Nxb4 21. Ne5+ Ke8 22. Qxb3 Qa2 23. Qc3 Bd6 24. Nc6 Nxc6 25. Qxc6+ Ke7 26. Qxb5 Ra8 27. e5 Ba3 28. Qb7 1-0

[Event "Groningen Vierkampen 1"]
[Site "Groningen"]
[Date "2015.12.23"]
[Round "3"]
[White "Wissmann, Dolf"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2040"]
[BlackElo "2153"]
[PlyCount "75"]
[EventDate "2015.12.21"]
[EventType "tourn"]
[EventRounds "3"]
[EventCountry "NED"]
[SourceTitle "EXT 2017"]
[Source "ChessBase"]
[SourceDate "2016.10.25"]
[SourceVersion "1"]
[SourceVersionDate "2016.10.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 a6 5. f3 b5 6. g4 Bb7 7. g5 Nh5 8. Qd2 Bg7 9. Nge2 Nd7 10. Ng3 Nxg3 11. hxg3 c5 12. dxc5 dxc5 13. 0-0-0 Bc6 14. Bh3 e6 15. Qd6 Ne5 16. Qxc5 Bd7 17. f4 Nc4 18. e5 Rc8 19. Qa7 Qc7 20. Rh2 Qxa7 21. Bxa7 h6 22. Bg2 hxg5 23. Rxh8+ Bxh8 24. Ne4 Rc7 25. Bc5 gxf4 26. gxf4 Nxe5 27. fxe5 Bxe5 28. b4 Bc6 29. Rh1 Bxe4 30. Bxe4 f5 31. Bd3 Rg7 32. Rh8+ Kd7 33. Ra8 Kc6 34. Rxa6+ Kd5 35. Bxb5 Rh7 36. Bc6+ Kc4 37. Bf3 Kb5 38. Be2# 1-0

[Event "Groningen Vierkampen 1"]
[Site "Groningen"]
[Date "2015.12.22"]
[Round "2"]
[White "De Groot, Hendrik"]
[Black "Beukema, Jasper"]
[Result "1-0"]
[ECO "E02"]
[WhiteElo "2153"]
[BlackElo "2040"]
[PlyCount "57"]
[EventDate "2015.12.21"]
[EventType "tourn"]
[EventRounds "3"]
[EventCountry "NED"]
[SourceTitle "EXT 2017"]
[Source "ChessBase"]
[SourceDate "2016.10.25"]
[SourceVersion "1"]
[SourceVersionDate "2016.10.25"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 d5 3. c4 e6 4. g3 dxc4 5. Qa4+ Bd7 6. Qxc4 Bc6 7. Bg2 Nbd7 8. 0-0 Bd6 9. Nc3 0-0 10. Re1 Ne4 11. d5 exd5 12. Nxd5 Ndf6 13. Nxf6+ Qxf6 14. Be3 Be7 15. Qc2 Rad8 16. Red1 Qe6 17. Nd4 Rxd4 18. Bxd4 f5 19. Rac1 f4 20. Qc4 Bd5 21. Qxc7 fxg3 22. hxg3 Bf6 23. Bxf6 Qxf6 24. Rxd5 Qxf2+ 25. Kh2 Qe3 26. Rd8 Qh6+ 27. Bh3 Ng5 28. Qc4+ Kh8 29. Rxf8# 1-0

[Event "Groningen Vierkampen 1"]
[Site "Groningen"]
[Date "2015.12.21"]
[Round "1"]
[White "Drill, Frank J"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "B09"]
[WhiteElo "2039"]
[BlackElo "2153"]
[PlyCount "50"]
[EventDate "2015.12.21"]
[EventType "tourn"]
[EventRounds "3"]
[EventCountry "NED"]
[SourceTitle "EXT 2017"]
[Source "ChessBase"]
[SourceDate "2016.10.25"]
[SourceVersion "1"]
[SourceVersionDate "2016.10.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. e5 Nfd7 6. Nf3 c5 7. Ng5 cxd4 8. e6 Nc5 9. Nxf7 Qa5 10. b4 Qxb4 11. Rb1 Qxc3+ 12. Bd2 Qa3 13. Bb5+ Nc6 14. Nxh8 Bxe6 15. 0-0 Bxh8 16. f5 gxf5 17. Qh5+ Kd7 18. Qxh7 Be5 19. Bg5 Re8 20. h4 Qg3 21. Rbe1 Qh2+ 22. Kf2 Bg3+ 23. Ke2 Qxg2+ 24. Kd1 Bxe1 25. Rxe1 Ne4 0-1

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Faber, Krine A"]
[Result "0-1"]
[ECO "B12"]
[WhiteElo "1691"]
[BlackElo "2112"]
[PlyCount "26"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. Be2 c5 6. Be3 cxd4 7. Nxd4 Ne7 8. c4 Nbc6 9. Qa4 a6 10. Na3 Qa5+ 11. Qxa5 Nxa5 12. cxd5 Nxd5 13. Nxf5 Bb4+ 0-1

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Holscher, Peter AC"]
[Result "0-1"]
[ECO "A04"]
[WhiteElo "1691"]
[BlackElo "2181"]
[PlyCount "8"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. Nf3 f5 2. d3 d6 3. e4 e5 4. Nc3 c5 0-1

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Koelewijn, Alex"]
[Result "0-1"]
[ECO "B47"]
[WhiteElo "1691"]
[PlyCount "10"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 0-1

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Peetoom, Frank F"]
[Result "0-1"]
[ECO "D90"]
[WhiteElo "1691"]
[BlackElo "1936"]
[PlyCount "10"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. g3 0-0 0-1

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "Faber, Krine A"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "E98"]
[WhiteElo "2112"]
[BlackElo "1691"]
[PlyCount "17"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. Be2 e5 7. 0-0 Nc6 8. d5 Ne7 9. Ne1 1-0

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "Holscher, Peter AC"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "E61"]
[WhiteElo "2181"]
[BlackElo "1691"]
[PlyCount "7"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 1-0

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "Koelewijn, Alex"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "E90"]
[BlackElo "1691"]
[PlyCount "9"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. d4 1-0

[Event "NED PRO2-E email"]
[Site "ICCF email"]
[Date "2015.01.05"]
[Round "?"]
[White "Peetoom, Frank F"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "E90"]
[WhiteElo "1936"]
[BlackElo "1691"]
[PlyCount "9"]
[EventDate "2015.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "NED"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 d6 3. c4 g6 4. Nc3 Bg7 5. e4 1-0

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.30"]
[Round "9"]
[White "Burcu, Cagatay"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "B08"]
[WhiteElo "2149"]
[BlackElo "2097"]
[PlyCount "62"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. d4 d6 2. e4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 0-0 6. 0-0 c6 7. h3 Qc7 8. a4 e5 9. dxe5 dxe5 10. Bc4 b6 11. Qe2 h6 12. Be3 Re8 13. Rad1 Be6 14. Bxe6 Rxe6 15. Qd2 h5 16. Qd8+ Qxd8 17. Rxd8+ Re8 18. Rfd1 Na6 19. Rxa8 Rxa8 20. Nxe5 Nxe4 21. Nxc6 Bxc3 22. bxc3 Nxc3 23. Ra1 Nd5 24. a5 Nxe3 25. fxe3 Kf8 26. Nxa7 bxa5 27. Nb5 Nb4 28. Nd4 Rc8 29. Rxa5 Nxc2 30. Kf2 Nxd4 31. exd4 Rc3 1/2-1/2

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.29"]
[Round "8"]
[White "De Groot, Hendrik"]
[Black "Chen, Yibo"]
[Result "1-0"]
[ECO "D11"]
[WhiteElo "2097"]
[BlackElo "2156"]
[PlyCount "67"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. d4 d5 2. g3 Nf6 3. Bg2 Bf5 4. c4 c6 5. Nc3 e6 6. Nf3 Bd6 7. 0-0 Nbd7 8. Re1 0-0 9. Nh4 Bg4 10. h3 Bh5 11. g4 Ne4 12. Nxe4 dxe4 13. g5 h6 14. Bxe4 hxg5 15. Bf3 g4 16. hxg4 Bxg4 17. Ng2 Bxf3 18. exf3 c5 19. Re4 Nf6 20. Bg5 Be7 21. Rh4 Nh7 22. Bxe7 Qxe7 23. Qd3 Nf6 24. Re1 cxd4 25. Nf4 g6 26. Qxd4 Qd8 27. Qe5 Kg7 28. Rg4 Kg8 29. Rg3 Nd7 30. Qh5 Nf6 31. Qh6 Qd2 32. Rxe6 Ne8 33. Rexg6+ fxg6 34. Qxg6+ 1-0

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.28"]
[Round "7"]
[White "Lyell, Mark"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "2236"]
[BlackElo "2097"]
[PlyCount "75"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. h3 0-0 6. Be3 a6 7. a4 d5 8. e5 Ne4 9. Bd3 Nxc3 10. bxc3 c5 11. dxc5 Nd7 12. 0-0 Nxe5 13. Nxe5 Bxe5 14. Bd4 Bg7 15. f4 Qc7 16. Qf3 Rd8 17. Rae1 f6 18. h4 e6 19. h5 f5 20. Re3 g5 21. Bxg7 Qxg7 22. fxg5 Qxg5 23. Qf2 Kf7 24. c4 d4 25. Rg3 Qf6 26. Be4 Rb8 27. h6 Qxh6 28. Rh3 Qg7 29. Qf4 Bd7 30. Qc7 Kf8 31. Qd6+ Kf7 32. Rxf5+ exf5 33. Bd5+ Ke8 34. Rg3 Qxg3 35. Qxg3 Bxa4 36. Qg7 Rxd5 37. cxd5 Rd8 38. Qe5+ 1-0

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.27"]
[Round "6"]
[White "De Groot, Hendrik"]
[Black "Gelip, Ioana"]
[Result "1-0"]
[ECO "E18"]
[WhiteElo "2097"]
[BlackElo "2151"]
[PlyCount "77"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. g3 b6 4. Bg2 Bb7 5. 0-0 Be7 6. c4 0-0 7. Nc3 d6 8. Qc2 c5 9. d5 exd5 10. cxd5 Nbd7 11. e4 Re8 12. h3 Bf8 13. Re1 a6 14. a4 Rb8 15. Bf4 Nh5 16. Bg5 Be7 17. Be3 Bc8 18. Qe2 Qc7 19. g4 Nhf6 20. g5 Nh5 21. Nh2 g6 22. f4 f5 23. exf5 Ng3 24. Qf3 Nxf5 25. Bf2 Bb7 26. Re4 b5 27. axb5 axb5 28. Nxb5 Qb6 29. Nc3 Qxb2 30. Rb1 Qxb1+ 31. Nxb1 Bxd5 32. Nc3 Bxe4 33. Qxe4 Kg7 34. Qc6 Nb6 35. Ng4 Nc4 36. Nd5 Na5 37. Qc7 Rb1+ 38. Kh2 Ra1 39. Ngf6 1-0

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.26"]
[Round "5"]
[White "Maris, Ivo"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2232"]
[BlackElo "2097"]
[PlyCount "25"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. f3 d5 4. e5 Ng8 5. Be3 e6 6. Qd2 b6 7. a4 c5 8. a5 c4 9. axb6 Qxb6 10. Nc3 Bb4 11. g4 Nc6 12. Bg2 Nxe5 13. dxe5 1-0

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.24"]
[Round "4"]
[White "De Groot, Hendrik"]
[Black "Afek, Yochanan"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "2097"]
[BlackElo "2285"]
[PlyCount "119"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. d4 Nf6 2. g3 g6 3. Bg2 Bg7 4. e4 d6 5. Nc3 0-0 6. Nge2 Nbd7 7. 0-0 e5 8. dxe5 dxe5 9. h3 c6 10. a4 a5 11. Be3 Qe7 12. Qd2 Nc5 13. Rfd1 Be6 14. Qd6 Qxd6 15. Rxd6 Na6 16. Rad1 Rfe8 17. Bb6 Bf8 18. R6d2 Bh6 19. Rd8 Raxd8 20. Rxd8 Rxd8 21. Bxd8 Nd7 22. g4 f6 23. Bf1 Nb4 24. Bxa5 Nxc2 25. Bc7 Kf7 26. Bd6 Bb3 27. f4 Ke6 28. Bc7 Ke7 29. Nc1 Bf7 30. Nd3 exf4 31. Bxf4 Bxf4 32. Nxf4 Kd6 33. Kf2 Ne5 34. Nd3 Nxd3+ 35. Bxd3 Nb4 36. Be2 Kc5 37. Ke3 Nc2+ 38. Kf4 Nd4 39. Bd1 g5+ 40. Ke3 Bg6 41. e5 fxe5 42. Ne4+ Bxe4 43. Kxe4 Kd6 44. b4 Ke6 45. a5 Nb5 46. Bb3+ Kf6 47. Kd3 Nd6 48. Ba4 Nb5 49. Bb3 Nc7 50. Bg8 h6 51. Bh7 Ke6 52. Kc4 Kd6 53. Be4 Nd5 54. Bf3 Ne3+ 55. Kd3 Nd5 56. Kc4 Nf6 57. Kd3 Kc7 58. Kc4 Kd6 59. Kd3 Nd5 60. Kc4 1/2-1/2

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.23"]
[Round "3"]
[White "Vogel, Jaap"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "A88"]
[WhiteElo "2195"]
[BlackElo "2097"]
[PlyCount "60"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. d4 d6 2. Nf3 f5 3. g3 Nf6 4. Bg2 g6 5. 0-0 Bg7 6. c4 0-0 7. Nc3 c6 8. b3 Na6 9. Bb2 Qa5 10. a3 e5 11. b4 Qc7 12. d5 c5 13. b5 Nb8 14. Ng5 Qe7 15. Rb1 e4 16. h4 h6 17. Nh3 Nbd7 18. Nf4 Ne5 19. Na4 Nfg4 20. Qb3 g5 21. hxg5 hxg5 22. Nh3 Nh6 23. Nc3 Qe8 24. f3 Qh5 25. Nd1 f4 26. g4 Nhxg4 27. fxg4 Bxg4 28. Ndf2 Bxe2 29. Nxe4 f3 30. Nexg5 fxg2 0-1

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.22"]
[Round "2"]
[White "De Groot, Hendrik"]
[Black "Beerdsen, Thomas"]
[Result "0-1"]
[ECO "A34"]
[WhiteElo "2097"]
[BlackElo "2314"]
[PlyCount "40"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. 0-0 Nf6 5. c4 0-0 6. Nc3 d5 7. cxd5 Nxd5 8. Qc2 Nc6 9. d3 Nc7 10. Rd1 b6 11. e3 Bb7 12. d4 cxd4 13. exd4 Rc8 14. Be3 Nd5 15. Nxd5 Qxd5 16. Ng5 Qxg2+ 17. Kxg2 Nxd4+ 18. Qe4 Bxe4+ 19. Nxe4 Nc2 20. Rac1 Bxb2 0-1

[Event "Groningen op 52nd"]
[Site "Groningen"]
[Date "2014.12.21"]
[Round "1"]
[White "Berkovich, Mark A"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "A88"]
[WhiteElo "2362"]
[BlackElo "2097"]
[PlyCount "39"]
[EventDate "2014.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 164 Extra"]
[Source "ChessBase"]
[SourceDate "2015.03.02"]
[SourceVersion "1"]
[SourceVersionDate "2015.03.02"]
[SourceQuality "1"]

1. c4 f5 2. Nf3 Nf6 3. Nc3 g6 4. g3 Bg7 5. Bg2 0-0 6. 0-0 d6 7. d4 c6 8. d5 e5 9. dxe6 Bxe6 10. Qd3 Qe7 11. Bf4 d5 12. Ng5 dxc4 13. Qe3 Re8 14. Rad1 Bf7 15. Qf3 Ng4 16. e4 Nd7 17. exf5 gxf5 18. Nxf7 Qxf7 19. Bh3 h5 20. Bd6 1/2-1/2

[Event "W-ch WS/O/774 email"]
[Site "ICCF email"]
[Date "2014.10.22"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "McGahee, Ben"]
[Result "1-0"]
[ECO "B95"]
[WhiteElo "1677"]
[BlackElo "1532"]
[PlyCount "53"]
[EventDate "2014.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. Qf3 Be7 8. Be2 Nc6 9. Nxc6 bxc6 10. 0-0 Bb7 11. Rad1 Qc7 12. Qg3 0-0-0 13. Bf4 e5 14. Be3 Rhg8 15. Ba7 Ba8 16. Bxa6+ Kd7 17. Be3 Ke8 18. f4 Rb8 19. fxe5 dxe5 20. Bc4 Rxb2 21. Bd4 Rxc2 22. Bxe5 Qa7+ 23. Bd4 Bc5 24. Bxc5 Qxc5+ 25. Kh1 Qxc4 26. Qb8+ Ke7 27. Qd6+ 1-0

[Event "W-ch WS/O/774 email"]
[Site "ICCF email"]
[Date "2014.10.22"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Norlund, Laurs"]
[Result "1/2-1/2"]
[ECO "B76"]
[WhiteElo "1677"]
[BlackElo "1660"]
[PlyCount "27"]
[EventDate "2014.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. f3 Bg7 7. Be3 0-0 8. Qd2 Nc6 9. 0-0-0 d5 10. Kb1 Nxd4 11. e5 Nxf3 12. gxf3 Nh5 13. Nxd5 Be6 14. f4 1/2-1/2

[Event "W-ch WS/O/774 email"]
[Site "ICCF email"]
[Date "2014.10.22"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Ronderos, L Nicolas"]
[Result "0-1"]
[ECO "B48"]
[WhiteElo "1677"]
[PlyCount "12"]
[EventDate "2014.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3 Nf6 0-1

[Event "W-ch WS/O/774 email"]
[Site "ICCF email"]
[Date "2014.10.22"]
[Round "?"]
[White "Eife, Gunter"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "1876"]
[BlackElo "1677"]
[PlyCount "47"]
[EventDate "2014.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 0-0 6. 0-0 c6 7. Re1 Nbd7 8. Bf4 Qc7 9. e5 Nh5 10. Bg5 dxe5 11. Bxe7 Re8 12. d5 Qb6 13. d6 Qxb2 14. Ne4 Nb6 15. g3 Bg4 16. Rb1 Qxa2 17. c4 Qa3 18. Ra1 Qb4 19. Nfd2 Bxe2 20. Qxe2 Qb2 21. Reb1 Qc2 22. Rc1 Qb2 23. Rab1 Qa2 24. Qd1 1-0

[Event "W-ch WS/O/774 email"]
[Site "ICCF email"]
[Date "2014.10.22"]
[Round "?"]
[White "Hebrard, Jean Marc"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "A87"]
[WhiteElo "1816"]
[BlackElo "1677"]
[PlyCount "51"]
[EventDate "2014.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. b3 Bg7 5. Bb2 0-0 6. c4 d6 7. Nf3 c5 8. 0-0 cxd4 9. Nxd4 Na6 10. Nc3 Nc5 11. Nc2 Be6 12. Ne3 a5 13. Qc2 f4 14. gxf4 Nh5 15. f5 gxf5 16. Bf3 Nf4 17. Kh1 Bd7 18. Rad1 Rf7 19. Nb5 Bxb2 20. Qxb2 Rg7 21. Nd5 Ng6 22. Rg1 Bc6 23. Rg2 e5 24. Qd2 f4 25. Rdg1 Kh8 26. Nbc3 1-0

[Event "W-ch WS/O/774 email"]
[Site "ICCF email"]
[Date "2014.10.22"]
[Round "?"]
[White "Ranieri, Alberto"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "A25"]
[WhiteElo "1800"]
[BlackElo "1677"]
[PlyCount "73"]
[EventDate "2014.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2017"]
[Source "ChessBase"]
[SourceDate "2017.09.19"]
[SourceVersion "1"]
[SourceVersionDate "2017.09.19"]
[SourceQuality "1"]

1. c4 f5 2. g3 Nf6 3. Bg2 e5 4. Nc3 Nc6 5. d3 Bc5 6. e3 Bb6 7. Nge2 0-0 8. a3 d6 9. 0-0 Be6 10. b4 a6 11. Nd5 Bxd5 12. cxd5 Ne7 13. Qb3 Qe8 14. Bd2 Qf7 15. a4 Nexd5 16. b5 axb5 17. Qxb5 Ra6 18. Rfb1 c6 19. Qb3 Rfa8 20. Nc3 Nxc3 21. Bxc3 R8a7 22. Qxf7+ Kxf7 23. a5 Bc7 24. d4 exd4 25. Bxd4 c5 26. Bxf6 Kxf6 27. Rxb7 Rxb7 28. Bxb7 Rxa5 29. Rxa5 Bxa5 30. f4 c4 31. Bd5 c3 32. Bb3 d5 33. Kf1 Bc7 34. Ke2 Ke6 35. Kd3 Ba5 36. Kd4 Kd6 37. Bc2 1/2-1/2

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.30"]
[Round "9"]
[White "De Groot, Hendrik"]
[Black "Chernukhin, Alexander"]
[Result "1/2-1/2"]
[ECO "A40"]
[WhiteElo "2063"]
[BlackElo "2145"]
[PlyCount "93"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. d4 e6 2. Qd3 d5 3. Bf4 Bd6 4. e3 Bxf4 5. exf4 Ne7 6. Nd2 b6 7. Qa3 a5 8. Ngf3 0-0 9. Bd3 h6 10. h4 Ba6 11. g4 Qd6 12. Qxd6 cxd6 13. Bxa6 Nxa6 14. c3 f5 15. g5 Ng6 16. 0-0-0 Nxf4 17. Kb1 h5 18. Rhe1 Nc7 19. Nf1 Rfe8 20. Ng3 g6 21. Ne2 Nxe2 22. Rxe2 Re7 23. Ne1 e5 24. Nd3 e4 25. Nf4 Kf7 26. Kc1 a4 27. a3 Ra5 28. Kd2 Ne6 29. Nxe6 Rxe6 30. Ke3 Re7 31. Kf4 Ra8 32. Re3 Rc8 33. Rd2 Rec7 34. Rd1 Ke7 35. Rc1 Kd7 36. Re2 Rc4 37. Rd1 Kc6 38. Rdd2 Kb5 39. Rd1 R4c7 40. Rdd2 Kc4 41. Rd1 Kb3 42. Ra1 Rc6 43. Rb1 R6c7 44. Rc1 Re7 45. Ra1 Rec7 46. Rc1 Ra8 47. Ra1 1/2-1/2

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.29"]
[Round "8"]
[White "Schoehuys, Erik"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "A21"]
[WhiteElo "2180"]
[BlackElo "2063"]
[PlyCount "41"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. d4 d6 2. c4 e5 3. Nf3 e4 4. Ng5 f5 5. Nc3 Nf6 6. g3 Be7 7. Bg2 c6 8. d5 cxd5 9. cxd5 0-0 10. 0-0 h6 11. Nh3 Nbd7 12. Be3 Ng4 13. Bd4 Bf6 14. f3 exf3 15. exf3 Nge5 16. Nf4 Nc5 17. Nh5 g6 18. Nxf6+ Rxf6 19. f4 Ned3 20. Rf3 Nxb2 21. Qe2 1-0

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.28"]
[Round "7"]
[White "De Groot, Hendrik"]
[Black "Balje, Jan"]
[Result "0-1"]
[ECO "A12"]
[WhiteElo "2063"]
[BlackElo "2198"]
[PlyCount "90"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. b3 d5 2. Bb2 Nf6 3. e3 c6 4. c4 Bf5 5. Nf3 e6 6. Be2 Nbd7 7. 0-0 h6 8. d3 Be7 9. Nbd2 0-0 10. Re1 a5 11. a3 Bh7 12. Rc1 Qb6 13. Bf1 Rfd8 14. Qe2 a4 15. b4 Qc7 16. e4 dxe4 17. dxe4 e5 18. c5 Re8 19. g3 Bf8 20. Bh3 b6 21. Bxd7 Nxd7 22. cxb6 Qxb6 23. Nc4 Qb5 24. Kg2 c5 25. bxc5 Nxc5 26. Nfd2 Rad8 27. Rb1 Nd3 28. Red1 Nxb2 29. Rxb2 Qc5 30. f3 Rb8 31. Rdb1 Rxb2 32. Rxb2 Rd8 33. Qf2 f6 34. Qxc5 Bxc5 35. Kf1 Bg6 36. Rb5 Bxa3 37. Ke2 Be7 38. Ra5 Be8 39. h4 Bb4 40. Rd5 Rxd5 41. exd5 a3 42. Nxa3 Bxa3 43. Ke3 Bc1 44. Ke4 Bxd2 45. g4 Bg6# 0-1

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.27"]
[Round "6"]
[White "Maris, Ivo"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "E18"]
[WhiteElo "2161"]
[BlackElo "2063"]
[PlyCount "122"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 b6 3. g3 Bb7 4. Bg2 e6 5. c4 Be7 6. 0-0 0-0 7. Nc3 d6 8. Qc2 Nbd7 9. Rd1 c5 10. b3 Rc8 11. d5 exd5 12. cxd5 a6 13. a4 b5 14. axb5 axb5 15. e4 Qb6 16. Bf1 Ba6 17. h3 Ra8 18. Be3 b4 19. Na4 Qb7 20. Nb2 Bxf1 21. Rxf1 Rxa1 22. Rxa1 Nb6 23. Nd2 Nfd7 24. Nbc4 f5 25. Bf4 fxe4 26. Bxd6 Bxd6 27. Nxd6 Qxd5 28. N2xe4 Rf3 29. Qe2 Qxb3 30. Nd2 Rxg3+ 31. Kf1 Qd3 32. fxg3 Qxd6 33. Ne4 Qe6 34. Kg2 c4 35. Rf1 Qc6 36. Kh2 h6 37. Ng5 Qg6 38. Nf7 Nf6 39. Nd6 c3 40. Nf5 Kh7 41. Qe5 Nbd5 42. g4 Qe8 43. Qxe8 Nxe8 44. Nd4 Nd6 45. Rb1 Nc4 46. Ne2 c2 47. Rb3 Na5 48. Rd3 b3 49. Nc1 Ne3 50. Kg3 Kg6 51. h4 Nec4 52. Rxb3 Nxb3 53. Nxb3 Kf6 54. Kf4 g5+ 55. hxg5+ hxg5+ 56. Kg3 Ke5 57. Nc5 Kd4 58. Nb3+ Kc3 59. Nc1 Ne5 60. Ne2+ Kd2 61. Nd4 c1Q 0-1

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.26"]
[Round "5"]
[White "De Groot, Hendrik"]
[Black "Beukema, Stefan"]
[Result "0-1"]
[ECO "A80"]
[WhiteElo "2063"]
[BlackElo "2280"]
[PlyCount "92"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. d4 f5 2. Qd3 d5 3. g4 fxg4 4. h3 Nf6 5. hxg4 Bxg4 6. Bh3 Bxh3 7. Nxh3 Qd7 8. Ng5 Nc6 9. Bf4 e6 10. Nc3 0-0-0 11. 0-0-0 h6 12. Nf3 Ng4 13. Rdf1 Qf7 14. Bg3 Bd6 15. Rhg1 Bxg3 16. Rxg3 Nxf2 17. Qe3 Ne4 18. Nxe4 dxe4 19. Nd2 Qd7 20. Nxe4 Nxd4 21. c3 Qc6 22. Rg4 Qc4 23. Kb1 Nf5 24. Rxf5 Rd1+ 25. Kc2 Qa4+ 26. b3 Qxa2+ 27. Kxd1 exf5 28. Nd6+ cxd6 29. Qe6+ Kb8 30. Rxg7 Rc8 31. Qxd6+ Ka8 32. Rc7 Qxb3+ 33. Kd2 Qb2+ 34. Kd1 Rg8 35. Rg7 Qb1+ 36. Kd2 Qb2+ 37. Kd1 Re8 38. Re7 Qb1+ 39. Kd2 Qb2+ 40. Kd1 Rb8 41. Qd4 f4 42. Re5 a6 43. Ra5 Rc8 44. Qd5 Qb6 45. Kc2 Re8 46. Kd2 Qb2+ 0-1

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.24"]
[Round "4"]
[White "Efroimski, Marsel"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "2307"]
[BlackElo "2063"]
[PlyCount "164"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5 c6 5. Bxf6 exf6 6. Qd2 d5 7. exd5 cxd5 8. Nge2 Be6 9. Nf4 Bh6 10. h4 Qd6 11. Nce2 Nc6 12. h5 0-0-0 13. hxg6 Bxf4 14. Nxf4 hxg6 15. Rxh8 Rxh8 16. 0-0-0 Bf5 17. a3 g5 18. Ne2 a6 19. Nc3 Rh4 20. Qe3 Kc7 21. g3 Rh2 22. Re1 Qe6 23. Qd2 Qd6 24. Na4 Rh1 25. Nc5 a5 26. Na4 b6 27. Nc3 Qd7 28. Qe3 Qe6 29. Qd2 Qd7 30. Bb5 Rxe1+ 31. Qxe1 Qe6 32. Qd2 Ne7 33. Be2 Bg4 34. Nb5+ Kd7 35. f3 Bf5 36. Bf1 g4 37. fxg4 Bxg4 38. Nc3 Bf3 39. Bb5+ Kd8 40. b3 Nf5 41. Qh2 Nxd4 42. Qh8+ Kc7 43. Qa8 Kd6 44. Qd8+ Ke5 45. Bd7 Qd6 46. Qe8+ Ne6 47. Qxf7 Qxa3+ 48. Kb1 Bg4 49. Nb5 Qb4 50. Na7 Qd6 51. Nc6+ Ke4 52. Qh7+ Ke3 53. Ne7 Qxg3 54. Nxd5+ Kd2 55. Bxe6 Qe1+ 56. Ka2 Qxe6 57. Qh6+ Kxc2 58. Ne3+ Kc3 59. Nc4 Qe2+ 60. Ka3 Qf2 61. Qc1+ Kd4 62. Nxb6 Ke4 63. Qc6+ Kd3 64. Qc4+ Kd2 65. Nd5 Qf3 66. Qd4+ Ke1 67. Ne3 f5 68. Nc2+ Kf1 69. Qc4+ Kf2 70. Qc5+ Kg3 71. Nd4 Qe4 72. Qc3+ Kh4 73. Qd2 f4 74. Qh2+ Kg5 75. Qd2 Qe3 76. Qxa5+ Kh4 77. Qc5 Kg3 78. Kb4 Qe1+ 79. Kb5 f3 80. Qd6+ Kg2 81. Qf4 Qg3 82. Qxg3+ Kxg3 1/2-1/2

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.23"]
[Round "3"]
[White "De Groot, Hendrik"]
[Black "Donchenko, Alexander"]
[Result "0-1"]
[ECO "B25"]
[WhiteElo "2063"]
[BlackElo "2455"]
[PlyCount "70"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. 0-0 Bg7 5. e4 d6 6. d3 e5 7. Nc3 Nge7 8. Nh4 0-0 9. f4 exf4 10. Bxf4 h6 11. Nf3 Be6 12. Nb5 a6 13. Nc3 b5 14. Qd2 b4 15. Nd1 Kh7 16. c3 bxc3 17. bxc3 d5 18. e5 Qd7 19. d4 cxd4 20. cxd4 g5 21. Bxg5 hxg5 22. Nxg5+ Kg8 23. Qe2 Bg4 24. Qd2 f6 25. exf6 Bxf6 26. Nf2 Bxd4 27. Kh1 Bxa1 28. Rxa1 Qf5 29. Nxg4 Qxg4 30. Re1 Rf5 31. Ne6 Re5 32. Nc7 Qd4 33. Qc1 Rc8 34. Ne6 Rxe1+ 35. Qxe1 Qe4 0-1

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.22"]
[Round "2"]
[White "Bellia, Fabrizio"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "B08"]
[WhiteElo "2424"]
[BlackElo "2063"]
[PlyCount "46"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. d4 d6 2. e4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 0-0 6. 0-0 c6 7. h3 Nbd7 8. a4 e5 9. dxe5 dxe5 10. Bc4 Nh5 11. Qd6 Bf6 12. Bh6 Re8 13. Rfd1 Ng7 14. a5 Ne6 15. Bxe6 Rxe6 16. Qb4 Be7 17. Qc4 g5 18. Bxg5 Bxg5 19. Rd3 Be7 20. Rad1 Qe8 21. Na4 b5 22. axb6 axb6 23. Qb3 b5 0-1

[Event "Groningen op-A 51st"]
[Site "Groningen"]
[Date "2013.12.21"]
[Round "1"]
[White "De Groot, Hendrik"]
[Black "Berkovich, Mark A"]
[Result "1/2-1/2"]
[ECO "B31"]
[WhiteElo "2063"]
[BlackElo "2366"]
[PlyCount "83"]
[EventDate "2013.12.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 158 Extra"]
[Source "ChessBase"]
[SourceDate "2014.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2014.02.28"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 Nc6 3. Bb5 g6 4. Bxc6 bxc6 5. d3 Bg7 6. 0-0 d6 7. Re1 e5 8. Na3 Ne7 9. Nc4 0-0 10. a4 f5 11. c3 Kh8 12. b4 cxb4 13. cxb4 Be6 14. Qc2 Qc7 15. Bb2 h6 16. Rac1 Rac8 17. Qd2 g5 18. exf5 Nxf5 19. Ncxe5 dxe5 20. Nxe5 Bd5 21. Ng6+ Kh7 22. Nxf8+ Rxf8 23. Bxg7 Qxg7 24. Qc3 Qf7 25. Qc5 Kg6 26. Re5 Nh4 27. f3 Nxf3+ 28. gxf3 Qxf3 29. Rxd5 Qg4+ 30. Kh1 Qf3+ 31. Kg1 cxd5 32. Qd6+ Rf6 33. Qg3 Qe2 34. b5 Qd2 35. Rf1 Rxf1+ 36. Kxf1 Qd1+ 37. Kg2 Qxa4 38. Qd6+ Kh5 39. Qxd5 Qg4+ 40. Kf2 Qh4+ 41. Kg2 Qg4+ 42. Kf2 1/2-1/2

[Event "W-ch WS/O/662 email"]
[Site "ICCF email"]
[Date "2013.07.20"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Bruce, Robert"]
[Result "0-1"]
[ECO "A11"]
[BlackElo "1884"]
[PlyCount "40"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 c6 3. g3 Nf6 4. Bg2 Bg4 5. Ne5 Bh5 6. cxd5 Nxd5 7. g4 Bg6 8. Nc3 Nf4 9. Bf3 Nd7 10. Nxg6 Nxg6 11. d4 e6 12. Qb3 Nb6 13. Be3 Be7 14. 0-0-0 0-0 15. Kb1 a5 16. Na4 Nxa4 17. Qxa4 Bg5 18. h3 Bxe3 19. fxe3 Qg5 20. Qb3 Qe7 0-1

[Event "W-ch WS/O/662 email"]
[Site "ICCF email"]
[Date "2013.07.20"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Durrett, Robert H"]
[Result "0-1"]
[ECO "B44"]
[BlackElo "1868"]
[PlyCount "42"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c5 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Nc6 6. e4 Bb4 7. Nxc6 bxc6 8. Bd3 e5 9. 0-0 0-0 10. Be3 d6 11. Qc1 Ng4 12. Bg5 Nf6 13. Be3 Be6 14. a3 Ba5 15. b4 Bb6 16. f3 Nd7 17. Rb1 Bxe3+ 18. Qxe3 Nb6 19. Qe2 a5 20. b5 cxb5 21. cxb5 Rc8 0-1

[Event "W-ch WS/O/662 email"]
[Site "ICCF email"]
[Date "2013.07.20"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Zvirgzdins, Alvis"]
[Result "0-1"]
[ECO "B52"]
[PlyCount "32"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. 0-0 Nc6 6. c4 g6 7. d4 cxd4 8. Nxd4 Bg7 9. Be3 Nf6 10. f3 0-0 11. Nc3 a6 12. Rc1 Rac8 13. b3 Nxd4 14. Bxd4 b5 15. cxb5 axb5 16. Qd3 b4 0-1

[Event "W-ch WS/O/662 email"]
[Site "ICCF email"]
[Date "2013.07.20"]
[Round "?"]
[White "Martinez Munoz, Javier"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "1700"]
[PlyCount "31"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 0-0 6. 0-0 c6 7. Bg5 d5 8. exd5 cxd5 9. Ne5 Nc6 10. Bb5 Qb6 11. b3 Ne4 12. Nxe4 Nxd4 13. a4 Bxe5 14. Rc1 dxe4 15. Bxe7 Nxb5 16. Bxf8 1-0

[Event "W-ch WS/O/662 email"]
[Site "ICCF email"]
[Date "2013.07.20"]
[Round "?"]
[White "Paul, Justin"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "A52"]
[PlyCount "34"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Bf4 Nc6 5. Nf3 Bb4+ 6. Nbd2 Qe7 7. e3 Ngxe5 8. Nxe5 Nxe5 9. Be2 0-0 10. 0-0 Bxd2 11. Qxd2 d6 12. b4 Rd8 13. Qc3 Bf5 14. Rad1 f6 15. Rd5 Be6 16. Rd2 b6 17. Rfd1 a5 1/2-1/2

[Event "W-ch WS/O/662 email"]
[Site "ICCF email"]
[Date "2013.07.20"]
[Round "?"]
[White "Thorsson, Bjarnsteinn"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B08"]
[PlyCount "41"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be2 Bg7 5. Nf3 0-0 6. 0-0 c6 7. h3 Qc7 8. a4 e5 9. dxe5 dxe5 10. Bc4 Na6 11. Be3 Nh5 12. Qd2 Rd8 13. Qc1 Nf4 14. Ng5 Ne6 15. Nxe6 Bxe6 16. Bxe6 fxe6 17. Qb1 Nb4 18. Na2 Nxa2 19. Qxa2 Qf7 20. Rfd1 a6 21. c3 1-0

[Event "W-ch WS/O/660 email"]
[Site "ICCF email"]
[Date "2013.07.16"]
[Round "?"]
[White "Acosta, Errol"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "B07"]
[WhiteElo "1646"]
[PlyCount "80"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. e4 d6 2. f4 d5 3. e5 e6 4. Nf3 Nh6 5. d4 c5 6. c3 Nc6 7. Be3 Qb6 8. b3 Bd7 9. a4 Rc8 10. Bb5 Nf5 11. Bf2 cxd4 12. Nxd4 Ncxd4 13. Bxd7+ Kxd7 14. 0-0 Qxb3 15. cxd4 Qxd1 16. Rxd1 h5 17. Na3 b6 18. Nb5 a6 19. Na3 Rc3 20. Nb1 Rc2 21. Na3 Rb2 22. Nb5 axb5 23. axb5 Be7 24. Ra7+ Ke8 25. Rc1 Bd8 26. Ra8 Rxb5 27. h4 Ra5 28. Rb8 Ra4 29. Rcc8 Kd7 30. Kh2 Rc4 31. Rxc4 dxc4 32. Be1 Kc7 33. Ra8 Kb7 34. Ra4 b5 35. Ra3 Bxh4 36. g3 Be7 37. Rf3 Nxd4 38. Rf2 b4 39. Kg2 c3 40. Ra2 Ra8 0-1

[Event "W-ch WS/O/660 email"]
[Site "ICCF email"]
[Date "2013.07.16"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Gutta, Srikrishna"]
[Result "1-0"]
[ECO "C41"]
[PlyCount "67"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 d6 3. d4 Bg4 4. dxe5 Bxf3 5. Qxf3 dxe5 6. Bc4 Nf6 7. Qb3 Bd6 8. Bxf7+ Kf8 9. Qxb7 Nbd7 10. Bb3 Nc5 11. Qb5 Nfxe4 12. 0-0 Rb8 13. Qc4 Qe7 14. Re1 Nxb3 15. axb3 Rb4 16. Qc6 Nxf2 17. Rf1 Bc5 18. Bg5 Qd6 19. Ra6 Rb6 20. Rxb6 axb6 21. Qa8+ Kf7 22. Qxh8 Kg6 23. h4 Nh3+ 24. Kh2 Nxg5 25. hxg5 e4+ 26. g3 Qe5 27. Qg8 Kxg5 28. Qxh7 Bd6 29. Rf4 e3 30. Nc3 Qxf4 31. Qxg7+ Kf5 32. Qf7+ Kg4 33. gxf4 Bxf4+ 34. Kg2 1-0

[Event "W-ch WS/O/660 email"]
[Site "ICCF email"]
[Date "2013.07.16"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Kasabasic, Djordje"]
[Result "0-1"]
[ECO "D46"]
[PlyCount "92"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 d5 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 Bb7 9. a3 Bd6 10. 0-0 0-0 11. Qc2 Rc8 12. Rd1 c5 13. Bxb5 Qc7 14. Qe2 Bxf3 15. Qxf3 Bxh2+ 16. Kh1 Bd6 17. Ba6 Rb8 18. Bd3 Rfc8 19. Nb5 Qb6 20. Nxd6 Qxd6 21. dxc5 Qxc5 22. b4 Qg5 23. Be2 Qh4+ 24. Kg1 Ne5 25. Qh3 Qxh3 26. gxh3 Rc2 27. Rd2 Rbc8 28. Rxc2 Rxc2 29. Bd1 Rc7 30. Bb2 Nd3 31. Bxf6 gxf6 32. b5 Nc5 33. a4 Nb7 34. Bf3 Na5 35. Rd1 f5 36. Kg2 Kg7 37. Rd6 Kf6 38. Ra6 Nb3 39. a5 Nc5 40. Rc6 Rxc6 41. Bxc6 Ke5 42. Kg3 Kd6 43. Kh4 Nd3 44. Bg2 Kc7 45. f4 Nc1 46. Kg5 Nb3 0-1

[Event "W-ch WS/O/660 email"]
[Site "ICCF email"]
[Date "2013.07.16"]
[Round "?"]
[White "De Groot, Hendrik"]
[Black "Ugulini, Michael"]
[Result "1-0"]
[ECO "D02"]
[PlyCount "47"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 Nf6 3. d4 Be6 4. Nc3 Qd6 5. c5 Qd8 6. Bf4 Nc6 7. e3 Bf5 8. Bb5 Bd7 9. 0-0 h5 10. Qb3 g6 11. Nxd5 Na5 12. Bxd7+ Nxd7 13. Qa4 c6 14. Nc7+ Qxc7 15. Bxc7 b6 16. cxb6 Nxb6 17. Qxa5 Bg7 18. Bxb6 Kd7 19. d5 axb6 20. dxc6+ Kd6 21. Rfd1+ Kxc6 22. Rac1+ Kb7 23. Rd7+ Kb8 24. Qxb6# 1-0

[Event "W-ch WS/O/660 email"]
[Site "ICCF email"]
[Date "2013.07.16"]
[Round "?"]
[White "Jokipii, Galen"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "B08"]
[WhiteElo "1315"]
[PlyCount "36"]
[EventDate "2013.??.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[SourceTitle "Corr 2015"]
[Source "ChessBase"]
[SourceDate "2015.07.17"]
[SourceVersion "1"]
[SourceVersionDate "2015.07.17"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. d5 0-0 6. Bd3 Nbd7 7. Bf4 c6 8. dxc6 bxc6 9. Nd4 Nc5 10. Be2 e5 11. Nxc6 Qc7 12. Nd5 Nxd5 13. Qxd5 exf4 14. Ne7+ Qxe7 15. Qxa8 Bxb2 16. Rb1 Bc3+ 17. Kf1 f3 18. gxf3 Bh3+ 0-1

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.22"]
[Round "9"]
[White "De Groot, Hendrik"]
[Black "Hoffman, Ron"]
[Result "0-1"]
[ECO "E92"]
[WhiteElo "1953"]
[BlackElo "2121"]
[PlyCount "100"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. Nf3 g6 2. c4 Bg7 3. Nc3 d6 4. e4 Nf6 5. d4 0-0 6. Be2 e5 7. dxe5 dxe5 8. Qxd8 Rxd8 9. Bg5 Nbd7 10. 0-0-0 Rf8 11. h3 c6 12. Be3 Re8 13. Nd2 Nf8 14. Nb3 Be6 15. Nc5 b6 16. Na6 Rec8 17. f3 Nh5 18. b3 Nd7 19. Kc2 Bf8 20. Rd2 Nf4 21. Bf1 Be7 22. h4 Nh5 23. Bf2 f5 24. Kb2 Nb8 25. c5 b5 26. Nb4 a5 27. Nd3 Nd7 28. exf5 gxf5 29. g4 Nf4 30. Nxf4 exf4 31. gxf5 Bxf5 32. Rg1+ Kf7 33. Ne4 Bxe4 34. Rxd7 Bf5 35. Rd1 Bf6+ 36. Kc1 a4 37. b4 Rd8 38. Be2 a3 39. Rd6 Bb2+ 40. Kd1 Rxd6+ 41. cxd6 Rd8 42. Bc5 Be5 43. Kc1 Bxd6 44. Rg5 Ke6 45. Bb6 Rb8 46. Bd4 Bxb4 47. Bd1 c5 48. Bb3+ c4 49. Bd1 Rd8 50. Bb6 Bd2# 0-1

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.21"]
[Round "8"]
[White "Stavast, Dick"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2097"]
[BlackElo "1953"]
[PlyCount "63"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. d4 d6 2. e4 Nf6 3. Nc3 g6 4. g3 Bg7 5. Bg2 0-0 6. Nge2 c6 7. 0-0 e5 8. h3 Nbd7 9. a4 a5 10. Be3 exd4 11. Bxd4 Re8 12. g4 h6 13. Ng3 Nf8 14. Qd2 Ne6 15. Be3 Kh7 16. Rad1 Bf8 17. f4 Nc7 18. g5 Ng8 19. f5 Qe7 20. Rde1 hxg5 21. Bxg5 Bh6 22. h4 Qe5 23. Nce2 Re7 24. h5 gxh5 25. Nxh5 f6 26. Bxh6 Nxh6 27. Rf4 Bd7 28. Rh4 Rg8 29. Nd4 Rg4 30. Rh3 Kg8 31. Nf3 Qc5+ 32. Kh1 1-0

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.20"]
[Round "7"]
[White "De Groot, Hendrik"]
[Black "Markus, John Raymond"]
[Result "1/2-1/2"]
[ECO "A30"]
[WhiteElo "1953"]
[BlackElo "2167"]
[PlyCount "30"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c5 3. g3 b6 4. Bg2 Bb7 5. 0-0 d6 6. Nc3 a6 7. a3 g6 8. b4 Bg7 9. Qc2 0-0 10. Bb2 Nbd7 11. Rab1 Rc8 12. d3 cxb4 13. axb4 d5 14. Nd2 Rc7 15. Qa4 d4 1/2-1/2

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.19"]
[Round "6"]
[White "Mellema, Andries"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "2182"]
[BlackElo "1953"]
[PlyCount "55"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f3 c6 5. Be3 b5 6. Qd2 Nbd7 7. g4 Nb6 8. h4 h5 9. g5 Nfd7 10. f4 b4 11. Nd1 Rb8 12. f5 Qc7 13. Nh3 c5 14. fxg6 fxg6 15. Nf4 Rg8 16. Be2 cxd4 17. Bxd4 Qc6 18. Nf2 Nc5 19. 0-0-0 b3 20. Kb1 bxa2+ 21. Ka1 Ne6 22. Nxe6 Bxe6 23. e5 Bf5 24. exd6 exd6 25. Rhe1 Kd7 26. Qa5 Qb7 27. Bb5+ Kc7 28. Qc3+ 1-0

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.18"]
[Round "5"]
[White "De Groot, Hendrik"]
[Black "Hendriks, Richard V"]
[Result "1-0"]
[ECO "A09"]
[WhiteElo "1953"]
[BlackElo "2136"]
[PlyCount "85"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 d4 3. g3 Nc6 4. Bg2 e5 5. d3 Nf6 6. 0-0 Bd6 7. e3 0-0 8. exd4 Nxd4 9. h3 Nxf3+ 10. Qxf3 h6 11. a3 Bc5 12. Nc3 Bd4 13. Ne2 Nh7 14. Nxd4 Qxd4 15. Qe2 c6 16. Be3 Qd6 17. b4 Rd8 18. Bc5 Qe6 19. a4 Ng5 20. h4 Nh3+ 21. Kh2 g5 22. hxg5 hxg5 23. Qh5 Kg7 24. Bxh3 Qf6 25. Bxc8 Rh8 26. Qxh8+ Kxh8 27. Bg4 Qg6 28. Rad1 f5 29. Be2 f4 30. b5 b6 31. Ba3 Kg7 32. g4 Qf6 33. Kg2 Rh8 34. Bf3 c5 35. Bb2 Re8 36. Rfe1 Kf8 37. Re2 Re7 38. Rde1 Qh6 39. Rxe5 Rxe5 40. Rxe5 Qg6 41. Be4 Qh6 42. Rf5+ Ke7 43. Bf6+ 1-0

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.17"]
[Round "4"]
[White "Lesman, Francis"]
[Black "De Groot, Hendrik"]
[Result "0-1"]
[ECO "A43"]
[WhiteElo "2074"]
[BlackElo "1953"]
[PlyCount "144"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. d4 c5 2. d5 g6 3. Nf3 Bg7 4. g3 b5 5. a4 b4 6. Bg2 d6 7. 0-0 Nf6 8. Re1 0-0 9. e4 Nbd7 10. Nbd2 Ba6 11. Nf1 Rc8 12. N3d2 e6 13. Ne3 exd5 14. exd5 c4 15. Bf1 Nb6 16. Bg2 c3 17. bxc3 bxc3 18. Nb3 Qd7 19. Nd4 Bb7 20. Nc6 Nbxd5 21. Nxd5 Nxd5 22. Na5 Ba8 23. Bxd5 Bxd5 24. Qxd5 Rc5 25. Qb7 Qf5 26. Nb3 Re5 27. Rxe5 Bxe5 28. Bh6 Rd8 29. f4 Bf6 30. Qg2 d5 31. g4 Qd7 32. Rd1 a5 33. h3 Bh4 34. Qf3 Qa7+ 35. Kg2 Re8 36. Bg5 Re3 37. Bxh4 Rxf3 38. Kxf3 f5 39. gxf5 gxf5 40. Bf2 Qf7 41. Rg1+ Kf8 42. Nd4 Qh5+ 43. Kg2 Qg6+ 44. Kh2 Qd6 45. Be3 Kf7 46. Rg7+ Ke8 47. Nb5 Qh6 48. Rg5 Qh4 49. Nd6+ Kd7 50. Nxf5 Qe1 51. Rg1 Qe2+ 52. Rg2 Qc4 53. Nd4 Qxa4 54. f5 Ke7 55. Rg7+ Kf6 56. Rxh7 Qe8 57. Rh6+ Kf7 58. Re6 Qb8+ 59. Kg2 Qg8+ 60. Kf2 Qb8 61. Kg2 Qg8+ 62. Kf3 Qb8 63. Bf4 Qb1 64. Re2 Qh1+ 65. Kg4 Qg1+ 66. Kf3 Qxd4 67. h4 Qf6 68. Kg4 Qg7+ 69. Bg5 Qd4+ 70. Kf3 a4 71. Re7+ Kf8 72. Rb7 Qe4+ 0-1

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.16"]
[Round "3"]
[White "De Groot, Hendrik"]
[Black "Vinke, Maarten"]
[Result "1/2-1/2"]
[ECO "A14"]
[WhiteElo "1953"]
[BlackElo "2032"]
[PlyCount "160"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 Nc6 3. Bg2 d5 4. c4 e6 5. 0-0 Nf6 6. b3 Be7 7. d3 0-0 8. Bb2 d4 9. e3 e5 10. exd4 exd4 11. Na3 Bf5 12. Nc2 a5 13. a3 Qc7 14. b4 axb4 15. axb4 Rxa1 16. Bxa1 b6 17. Re1 Bd6 18. Qd2 h6 19. Nh4 Bh7 20. bxc5 bxc5 21. Bh3 Ne5 22. Bf1 g5 23. Rxe5 Bxe5 24. Nf3 Ra8 25. Nxg5 hxg5 26. Qxg5+ Kh8 27. f4 Rg8 28. Qxe5 Qxe5 29. fxe5 Ng4 30. Nxd4 cxd4 31. Bxd4 Rd8 32. Bc3 Ne3 33. Be2 Nf5 34. Kf2 Kg8 35. g4 Nd4 36. Bxd4 Rxd4 37. Ke3 Rd8 38. d4 Kf8 39. d5 Ke7 40. Kd4 Ra8 41. Bf3 Ra3 42. d6+ Kd7 43. Bd5 Rd3+ 44. Kc5 Re3 45. Bc6+ Kd8 46. Kb6 Rxe5 47. c5 Be4 48. Bb5 Rg5 49. h3 Rg6 50. Bc4 Rf6 51. g5 Rf4 52. Bb5 Bd5 53. c6 Bxc6 54. Kxc6 Rh4 55. Kd5 Rxh3 56. Ke5 Rf3 57. Bc6 Rf1 58. Be4 Re1 59. Kd5 Rg1 60. Ke5 Rxg5+ 61. Kf6 Rg4 62. Bf5 Rf4 63. Ke5 Rf1 64. Kf6 Ke8 65. Ke5 Kf8 66. Kf6 Rf2 67. d7 Rd2 68. Bg4 Rd6+ 69. Ke5 Ke7 70. Bh3 Ra6 71. Bf5 Rb6 72. Kf4 f6 73. Bh3 Rb4+ 74. Kf5 Rd4 75. Kg6 Rd3 76. Bg4 Rg3 77. Kf5 Kxd7 78. Kf4+ Rxg4+ 79. Kxg4 Ke6 80. Kf4 f5 1/2-1/2

[Event "Hoogeveen Unive op 15th"]
[Site "Hoogeveen"]
[Date "2011.10.14"]
[Round "1"]
[White "Timmermans, Ivo"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "E97"]
[WhiteElo "2247"]
[BlackElo "1953"]
[PlyCount "57"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 144 Extra"]
[Source "ChessBase"]
[SourceDate "2011.10.28"]
[SourceVersion "1"]
[SourceVersionDate "2011.10.28"]
[SourceQuality "1"]

1. d4 d6 2. c4 Nf6 3. Nc3 g6 4. e4 Bg7 5. Nf3 0-0 6. Be2 e5 7. 0-0 Nc6 8. d5 Ne7 9. b4 Nh5 10. Re1 f5 11. Ng5 Nf4 12. Bxf4 exf4 13. Rc1 Bf6 14. Ne6 Bxe6 15. dxe6 a5 16. b5 b6 17. Bf3 Rb8 18. Nd5 Nxd5 19. cxd5 Bb2 20. Rc2 Ba3 21. exf5 Rxf5 22. e7 Qe8 23. Rxc7 Bb4 24. Bg4 Bxe1 25. Bxf5 Bxf2+ 26. Kxf2 gxf5 27. Qe2 Qf7 28. Rd7 Re8 29. Rd8 1-0

[Event "NED-ch op U18"]
[Site "Enschede"]
[Date "2010.08.12"]
[Round "6"]
[White "De Groot, Hendrik"]
[Black "Manoch, Maurice"]
[Result "1-0"]
[ECO "A26"]
[WhiteElo "1758"]
[BlackElo "1765"]
[PlyCount "81"]
[EventDate "2010.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. 0-0 0-0 5. c4 d6 6. Nc3 e5 7. d3 h6 8. Rb1 a5 9. a3 Nc6 10. b4 Nh5 11. b5 Ne7 12. e4 Qe8 13. Bb2 f5 14. d4 Be6 15. dxe5 dxe5 16. Nd5 Nxd5 17. exd5 Bd7 18. Nxe5 Bxe5 19. Re1 Qf7 20. Bxe5 Rae8 21. Bf3 f4 22. g4 Ng7 23. Qd4 b6 24. Re4 g5 25. Rbe1 Bc8 26. c5 bxc5 27. Qxc5 Bb7 28. Bxc7 Rxe4 29. Rxe4 Qxd5 30. Qxd5+ Bxd5 31. Bxa5 Bxe4 32. Bxe4 Ne8 33. Bd5+ Kg7 34. Bb4 Rh8 35. b6 Nf6 36. Bc6 Kf7 37. a4 Ke6 38. a5 Nd5 39. Bc5 Ne7 40. Bf3 Nd5 41. a6 1-0

[Event "NED-ch op U18"]
[Site "Enschede"]
[Date "2010.08.11"]
[Round "5"]
[White "Bassant, Jesse"]
[Black "De Groot, Hendrik"]
[Result "1/2-1/2"]
[ECO "E65"]
[WhiteElo "1938"]
[BlackElo "1758"]
[PlyCount "57"]
[EventDate "2010.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 c5 3. d5 g6 4. c4 Bg7 5. Nc3 0-0 6. g3 d6 7. Bg2 Nbd7 8. 0-0 Ng4 9. e4 Nge5 10. Nd2 Nb6 11. Qe2 f5 12. f4 Ng4 13. e5 dxe5 14. h3 exf4 15. hxg4 Bd4+ 16. Kh1 fxg3 17. Nf3 fxg4 18. Nxd4 Rxf1+ 19. Bxf1 cxd4 20. Ne4 Qc7 21. Bg5 Bf5 22. Kg2 d3 23. Qxd3 Qe5 24. Re1 Bxe4+ 25. Qxe4 Qxg5 26. Qxe7 Qf4 27. Qe6+ Kf8 28. Qe7+ Kg8 29. Qe6+ 1/2-1/2

[Event "NED-ch op U18"]
[Site "Enschede"]
[Date "2010.08.10"]
[Round "4"]
[White "De Groot, Hendrik"]
[Black "Damen, Igor"]
[Result "1/2-1/2"]
[ECO "C55"]
[WhiteElo "1758"]
[BlackElo "1937"]
[PlyCount "86"]
[EventDate "2010.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Be7 5. 0-0 0-0 6. c3 d6 7. Bb3 Na5 8. Bc2 c5 9. h3 Qc7 10. Re1 Nc6 11. Nbd2 Ne8 12. Nf1 f5 13. Bb3+ Kh8 14. exf5 Bxf5 15. Ne3 Qd7 16. Nxf5 Qxf5 17. Qe2 Nc7 18. Qe4 Rad8 19. d4 Qxe4 20. Rxe4 d5 21. Rxe5 Bf6 22. Re1 cxd4 23. Bf4 Nb5 24. Ba4 Nxc3 25. bxc3 dxc3 26. Bxc6 bxc6 27. Ne5 c5 28. Rac1 d4 29. Nc4 d3 30. Red1 d2 31. Nxd2 cxd2 32. Rxd2 Bd4 33. Bg3 Kg8 34. Bh4 Rde8 35. Bg5 Re5 36. Be3 Rxe3 37. Rxd4 cxd4 38. fxe3 dxe3 39. Rc2 Re8 40. Kf1 Re5 41. Ke2 Re7 42. Rc4 Rb7 43. Rc2 Kf7 1/2-1/2

[Event "NED-ch op U18"]
[Site "Enschede"]
[Date "2010.08.10"]
[Round "2"]
[White "De Groot, Hendrik"]
[Black "Leentvaar, Maurits"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "1758"]
[BlackElo "1481"]
[PlyCount "51"]
[EventDate "2010.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. Bb5 Nf6 4. Bxc6 bxc6 5. f4 e6 6. Nf3 Be7 7. 0-0 Qc7 8. d3 Rb8 9. Qe1 0-0 10. f5 exf5 11. e5 Nd5 12. Qg3 g6 13. Bh6 Rxb2 14. Nxd5 cxd5 15. Ng5 Bxg5 16. Bxg5 f6 17. Rxf5 fxg5 18. Rxf8+ Kxf8 19. Rf1+ Ke8 20. Qf3 d6 21. Qf8+ Kd7 22. Rf7+ Kc6 23. Rxc7+ Kxc7 24. Qxd6+ Kb7 25. Qxc5 Be6 26. Qe7+ 1-0

[Event "NED-ch op U18"]
[Site "Enschede"]
[Date "2010.08.10"]
[Round "3"]
[White "Klapwijk, Bram"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "A40"]
[WhiteElo "2013"]
[BlackElo "1758"]
[PlyCount "35"]
[EventDate "2010.08.09"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 137 Extra"]
[Source "ChessBase"]
[SourceDate "2010.09.01"]
[SourceVersion "1"]
[SourceVersionDate "2010.09.01"]
[SourceQuality "1"]

1. d4 e5 2. dxe5 Qe7 3. Nc3 Nc6 4. g3 Nxe5 5. Bg2 c6 6. Nf3 d5 7. Nxe5 Qxe5 8. Bf4 Qe6 9. 0-0 Nf6 10. e4 dxe4 11. Nxe4 Nxe4 12. Bxe4 Bd7 13. Bc7 Bc5 14. Re1 Kf8 15. Bg2 Qf5 16. Bd6+ Bxd6 17. Qxd6+ Kg8 18. Rad1 1-0

[Event "Enschede op-A U18"]
[Site "Enschede"]
[Date "2009.08.07"]
[Round "8"]
[White "De Groot, Hendrik"]
[Black "Van Ee, Winston"]
[Result "1-0"]
[ECO "C54"]
[WhiteElo "1578"]
[BlackElo "1330"]
[PlyCount "83"]
[EventDate "2009.08.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 132 Extra"]
[Source "ChessBase"]
[SourceDate "2009.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2009.11.03"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 0-0 6. Bb3 d6 7. h3 Re8 8. Nbd2 d5 9. Bc2 d4 10. cxd4 Nxd4 11. Nxd4 Qxd4 12. 0-0 Bb6 13. Nc4 Be6 14. Be3 Qd7 15. Bxb6 axb6 16. Nxe5 Qc8 17. f4 Nd7 18. Bb3 Nxe5 19. fxe5 Bxb3 20. Qxb3 Qe6 21. Qxe6 Rxe6 22. d4 c5 23. dxc5 bxc5 24. Rad1 Rae8 25. Rd7 R6e7 26. Rxe7 Rxe7 27. Rd1 h6 28. Rd5 b6 29. Kf2 Kf8 30. Rd8+ Re8 31. Rxe8+ Kxe8 32. Kf3 Ke7 33. Kf4 Ke6 34. h4 g5+ 35. hxg5 hxg5+ 36. Ke3 Kxe5 37. g3 f5 38. exf5 Kxf5 39. Kf3 g4+ 40. Ke3 c4 41. Kd4 b5 42. a3 1-0

[Event "Enschede op-A U18"]
[Site "Enschede"]
[Date "2009.08.05"]
[Round "5"]
[White "Beijen, Mark2222"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B09"]
[WhiteElo "1544"]
[BlackElo "1578"]
[PlyCount "47"]
[EventDate "2009.08.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 132 Extra"]
[Source "ChessBase"]
[SourceDate "2009.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2009.11.03"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 6. dxc5 Qa5 7. Bd2 Qxc5 8. Bb5+ Bd7 9. Bxd7+ Nfxd7 10. Qe2 Nc6 11. Na4 Qxc2 12. Bc3 Qxe2+ 13. Kxe2 0-0 14. Bxg7 Kxg7 15. Nc3 Rac8 16. Rad1 Nf6 17. e5 dxe5 18. fxe5 Ng4 19. Rd7 Rb8 20. Rhd1 Rfd8 21. h3 Nh6 22. Ne4 b6 23. Neg5 e6 24. Nxe6+ 1-0

[Event "Enschede op-A U18"]
[Site "Enschede"]
[Date "2009.08.05"]
[Round "6"]
[White "De Groot, Hendrik"]
[Black "Hummel, Thomas"]
[Result "1/2-1/2"]
[ECO "C41"]
[WhiteElo "1578"]
[BlackElo "1751"]
[PlyCount "36"]
[EventDate "2009.08.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 132 Extra"]
[Source "ChessBase"]
[SourceDate "2009.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2009.11.03"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7 4. Nf3 e5 5. Bc4 h6 6. 0-0 Be7 7. h3 c6 8. a4 Qc7 9. Be3 Nf8 10. Qe2 g5 11. dxe5 dxe5 12. Nh2 Ng6 13. Rad1 Bd7 14. Rd2 Rd8 15. Rfd1 Bb4 16. Qf3 Be7 17. Ng4 Bxg4 18. hxg4 b6 1/2-1/2

[Event "Enschede op-A U18"]
[Site "Enschede"]
[Date "2009.08.04"]
[Round "2"]
[White "Van Akkeren, Arno"]
[Black "De Groot, Hendrik"]
[Result "1-0"]
[ECO "B09"]
[WhiteElo "1773"]
[BlackElo "1578"]
[PlyCount "39"]
[EventDate "2009.08.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 132 Extra"]
[Source "ChessBase"]
[SourceDate "2009.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2009.11.03"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 6. dxc5 Qa5 7. Qd3 Qxc5 8. Be3 Qa5 9. h3 Nc6 10. Kf2 0-0 11. g4 Nb4 12. Qd2 d5 13. e5 Ne4+ 14. Nxe4 dxe4 15. Ng5 Rd8 16. Qc3 b6 17. Bc4 Rf8 18. a3 Nc6 19. b4 Qa4 20. Bb3 1-0

[Event "Enschede op-A U18"]
[Site "Enschede"]
[Date "2009.08.03"]
[Round "1"]
[White "De Groot, Hendrik"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1578"]
[BlackElo "1939"]
[PlyCount "36"]
[EventDate "2009.08.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 132 Extra"]
[Source "ChessBase"]
[SourceDate "2009.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2009.11.03"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Bd3 Nf6 4. exd5 exd5 5. Nf3 Bg4 6. Bg5 Be7 7. Nbd2 Nc6 8. c3 Qd7 9. Qc2 0-0-0 10. h3 Be6 11. Bb5 Bf5 12. Qa4 Qe6+ 13. Be3 Nb8 14. Ng5 Qb6 15. Nxf7 a6 16. Be2 Qxb2 17. 0-0 Bc2 18. Rab1 Qxb1 0-1

