[Event "Utrecht OKU op 48th"]
[Site "Utrecht"]
[Date "2023.05.21"]
[Round "5"]
[White "Ondersteijn, Niels"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A30"]
[WhiteElo "2375"]
[BlackElo "2099"]
[PlyCount "115"]
[EventDate "2023.05.19"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. c4 e6 2. g3 c5 3. Nf3 b6 4. Bg2 Bb7 5. 0-0 Nf6 6. Nc3 Be7 7. b3 0-0 8. d4 cxd4 9. Qxd4 Nc6 10. Qd2 Qb8 11. Bb2 Rd8 12. e4 Bb4 13. Qe2 Ne7 14. e5 Bxc3 15. Bxc3 Ne4 16. Bb2 a5 17. Rfd1 Nc5 18. Rd2 Ra7 19. Ba3 Ng6 20. Rd6 Bc6 21. Nd4 Bxg2 22. Kxg2 a4 23. Nb5 Qa8+ 24. f3 Rb7 25. b4 Na6 26. Rad1 Ne7 27. Qe4 Qc8 28. R6d3 Rb8 29. Nd6 Qc7 30. Qf4 Rf8 31. Nb5 Qc6 32. Rd6 Qc8 33. Na7 Qc7 34. Nb5 Qc8 35. Nc3 Nf5 36. R6d3 Nc7 37. b5 Rd8 38. g4 Nh4+ 39. Kg3 Ng6 40. Qe4 Ne8 41. f4 f5 42. gxf5 exf5 43. Qxf5 Qxc4 44. h4 d6 45. h5 Ne7 46. Qg4 Qf7 47. e6 Nf5+ 48. Kh2 Qf6 49. Nd5 Qxe6 50. Qxf5 Qxf5 51. Ne7+ Kf7 52. Nxf5 d5 53. Rxd5 Rxd5 54. Rxd5 Nf6 55. Nd6+ Ke6 56. Re5+ Kd7 57. Kh3 h6 58. Nc4 1-0

[Event "Utrecht OKU op 48th"]
[Site "Utrecht"]
[Date "2023.05.20"]
[Round "3"]
[White "Lombaers, Peter"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A96"]
[WhiteElo "2368"]
[BlackElo "2099"]
[PlyCount "120"]
[EventDate "2023.05.19"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Ne4 8. Nxe4 fxe4 9. Ne1 d5 10. Be3 Nc6 11. Rc1 Na5 12. b3 Ba3 13. Rb1 b6 14. f3 exf3 15. Nxf3 Be7 16. Qc2 Bb7 17. cxd5 Bxd5 18. Bf2 Nc6 19. e4 Nb4 20. Qe2 Bb7 21. Rfd1 Qe8 22. a3 Ba6 23. Qd2 Nd3 24. Be3 Qh5 25. Ne1 Nxe1 26. Rxe1 Rad8 27. Qc3 c5 28. b4 cxd4 29. Bxd4 Rc8 30. Qb2 Qg4 31. Rbc1 Rxc1 32. Qxc1 Rc8 33. Qf4 Qxf4 34. gxf4 Rd8 35. Rd1 g5 36. Bf3 gxf4 37. Be5 Rxd1+ 38. Bxd1 Bd3 39. Bf3 a5 40. bxa5 bxa5 41. Bb2 a4 42. Kg2 e5 43. Bxe5 Bxa3 44. Bxf4 Bb2 45. Bd6 a3 46. Bxa3 Bxa3 47. e5 Bc4 48. Bc6 Bb2 49. Bb7 Bxe5 50. Bc6 Be6 51. Bb7 Kg7 52. Bc6 Kf6 53. Be4 h6 54. Bc6 Kg5 55. Bb7 Kh4 56. Bc6 Bh3+ 57. Kg1 Bd4+ 58. Kh1 Bf2 59. Bg2 h5 60. Bxh3 Kxh3 1/2-1/2

[Event "Utrecht OKU op 48th"]
[Site "Utrecht"]
[Date "2023.05.19"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Zwirs, Nico"]
[Result "1/2-1/2"]
[ECO "B44"]
[WhiteElo "2099"]
[BlackElo "2447"]
[PlyCount "72"]
[EventDate "2023.05.19"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nxc6 bxc6 6. Bd3 d5 7. 0-0 Bd6 8. Qe2 Qc7 9. exd5 cxd5 10. Nc3 Ne7 11. Nb5 Qb8 12. Nxd6+ Qxd6 13. b3 0-0 14. Bb2 Ng6 15. g3 Bb7 16. h4 d4 17. Rfe1 Rfd8 18. Rad1 Rac8 19. Be4 Bxe4 20. Qxe4 e5 21. c3 Qa6 22. h5 Nf8 23. a3 dxc3 24. Rxd8 Rxd8 25. Bxc3 f6 26. Bb4 Ne6 27. Rc1 Ng5 28. Qc6 Rd1+ 29. Kh2 Qxc6 30. Rxc6 Nf3+ 31. Kh3 f5 32. g4 f4 33. Kg2 Nh4+ 34. Kh2 Nf3+ 35. Kg2 Nh4+ 36. Kh2 Nf3+ 1/2-1/2

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.08.04"]
[Round "9"]
[White "Roorda, Thijs"]
[Black "Shakhverdian, William"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2113"]
[BlackElo "2040"]
[PlyCount "49"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 c5 3. Bg2 Nf6 4. 0-0 Nc6 5. d4 cxd4 6. Nxd4 e5 7. Nxc6 bxc6 8. c4 Be6 9. Nc3 Rb8 10. cxd5 cxd5 11. Qa4+ Qd7 12. Qxd7+ Kxd7 13. Rd1 Bb4 14. Nxd5 Nxd5 15. Bxd5 Bxd5 16. Rxd5+ Ke6 17. e4 f5 18. Be3 Be7 19. Rad1 f4 20. gxf4 exf4 21. Bxf4 Rxb2 22. Re5+ Kf6 23. Rd7 Bb4 24. Rf5+ Ke6 25. Rxa7 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.08.03"]
[Round "8"]
[White "Saketh, Pedagandham"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "1928"]
[BlackElo "2113"]
[PlyCount "87"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. Nf3 e6 2. g3 f5 3. Bg2 Nf6 4. c4 Be7 5. 0-0 0-0 6. Nc3 d6 7. d4 Ne4 8. Nxe4 fxe4 9. Nd2 d5 10. f3 Nc6 11. e3 exf3 12. Nxf3 Bf6 13. b3 Qe7 14. Bb2 dxc4 15. bxc4 e5 16. dxe5 Rd8 17. exf6 Qxe3+ 18. Kh1 Rxd1 19. f7+ Kxf7 20. Raxd1 Kg8 21. Rde1 Qc5 22. Re8+ Kf7 23. Rh8 Rb8 24. Ng5+ Kg6 25. Be4+ Bf5 26. Rxf5 Qxf5 27. Rxb8 Nxb8 28. Bxf5+ Kxf5 29. h4 h6 30. Nf3 g5 31. hxg5 hxg5 32. Kg2 c5 33. Ne5 Na6 34. Kf3 Nc7 35. g4+ Ke6 36. Ke4 Ne8 37. Nf3 Nd6+ 38. Kd3 Nf7 39. Bg7 a6 40. a4 a5 41. Bc3 b6 42. Bg7 Ke7 43. Ke4 Ke6 44. Be5 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.08.01"]
[Round "6"]
[White "Roorda, Thijs"]
[Black "Albers, Sasa"]
[Result "0-1"]
[ECO "B11"]
[WhiteElo "2113"]
[BlackElo "2203"]
[PlyCount "106"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 c6 2. Nf3 d5 3. Nc3 Nf6 4. e5 Ne4 5. Ne2 Qb6 6. d4 e6 7. c3 c5 8. Qb3 Nc6 9. Be3 Bd7 10. dxc5 Qc7 11. Ned4 Nxc5 12. Nb5 Qb8 13. Bxc5 Bxc5 14. c4 Nxe5 15. 0-0-0 Nxf3 16. gxf3 0-0 17. cxd5 Qf4+ 18. Kb1 Rac8 19. Nc3 Bxf2 20. Bh3 Qxf3 21. dxe6 Bxe6 22. Bxe6 fxe6 23. Qxe6+ Kh8 24. Qd5 Qf6 25. Ne4 Qg6 26. Rd3 Bb6 27. Rhd1 h6 28. Qxb7 Rb8 29. Rd6 Qxd6 30. Nxd6 Rxb7 31. Nxb7 Rf2 32. a4 Rxh2 33. a5 Bc7 34. Rd5 Re2 35. Nd8 g5 36. Nf7+ Kg7 37. Rd7 Bxa5 38. Nxg5+ Kg6 39. Nh3 Re1+ 40. Kc2 Bb6 41. Rd6+ Kh5 42. Nf4+ Kg5 43. Nh3+ Kg4 44. Rxh6 Re2+ 45. Kb1 Rh2 46. Rc6 Rxh3 47. Ka2 Kf5 48. Rc4 Ke5 49. b3 Kd5 50. Kb2 Rh2+ 51. Kc3 Ba5+ 52. Kd3 Rd2+ 53. Ke3 Rb2 0-1

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.07.30"]
[Round "5"]
[White "Baselmans, Luuk"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "C07"]
[WhiteElo "2256"]
[BlackElo "2113"]
[PlyCount "51"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd6 7. 0-0 Nf6 8. Nb3 Nc6 9. Nbxd4 Nxd4 10. Nxd4 Be7 11. Re1 0-0 12. c3 Bd7 13. Qe2 Rac8 14. Bb3 Bd8 15. Bg5 Nd5 16. Bxd8 Rfxd8 17. Rad1 Bc6 18. Qf3 Nf6 19. Nxc6 Qxc6 20. Qxc6 bxc6 21. Rxd8+ Rxd8 22. Re5 Rd2 23. Rc5 Rxb2 24. f3 g6 25. Rxc6 Nd5 26. Bxd5 1/2-1/2

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.07.29"]
[Round "4"]
[White "Roorda, Thijs"]
[Black "De Boer, Bas"]
[Result "1/2-1/2"]
[ECO "D46"]
[WhiteElo "2113"]
[BlackElo "2136"]
[PlyCount "43"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. Nf3 d5 2. e3 Nf6 3. c4 c6 4. d4 e6 5. Nbd2 Nbd7 6. Bd3 Be7 7. 0-0 0-0 8. e4 dxe4 9. Nxe4 h6 10. Qe2 Re8 11. b3 c5 12. Bb2 Nxe4 13. Bxe4 cxd4 14. Nxd4 Nf6 15. Rad1 Nxe4 16. Nc6 Qc7 17. Nxe7+ Rxe7 18. Qxe4 e5 19. h3 f6 20. Ba3 Re8 21. Bd6 Qf7 22. Rfe1 1/2-1/2

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.07.28"]
[Round "3"]
[White "Vogel, Jaap"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A96"]
[WhiteElo "2147"]
[BlackElo "2113"]
[PlyCount "33"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 f5 3. g3 Nf6 4. Bg2 Be7 5. 0-0 0-0 6. c4 d6 7. Nc3 Ne4 8. Nxe4 fxe4 9. Nd2 d5 10. f3 Nc6 11. fxe4 Rxf1+ 12. Nxf1 dxc4 13. Be3 Bd7 14. e5 Rb8 15. Rc1 Be8 16. Rxc4 Nxe5 17. Rc1 1/2-1/2

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.07.27"]
[Round "2"]
[White "Mollema, Thomas"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "2235"]
[BlackElo "2113"]
[PlyCount "74"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nf6 5. Bd3 c5 6. 0-0 c4 7. Re1+ Be7 8. Bf1 0-0 9. b3 cxb3 10. axb3 Nc6 11. c3 Bg4 12. Nbd2 Bd6 13. Bd3 Qc7 14. h3 Bh5 15. Nf1 Rfe8 16. Rxe8+ Rxe8 17. Ne3 a6 18. Bd2 Ne7 19. Rc1 Ne4 20. Be1 Bh2+ 21. Kh1 Bf4 22. c4 Bxe3 23. fxe3 Nf5 24. cxd5 Qe7 25. Bxe4 Qxe4 26. Ng5 Bxd1 27. Nxe4 Bxb3 28. d6 Ba4 29. Nc5 Bc6 30. d7 Rb8 31. d5 Bb5 32. Ba5 Ng3+ 33. Kh2 Nf1+ 34. Kg1 Ng3 35. Kh2 Nf1+ 36. Rxf1 Bxf1 37. Nxb7 Rxb7 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2022.07.26"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Van Baar, Esper"]
[Result "0-1"]
[ECO "D00"]
[WhiteElo "2113"]
[BlackElo "2281"]
[PlyCount "76"]
[EventDate "2022.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 d5 3. Bf4 a6 4. e3 e6 5. g4 Bb4 6. Bd3 c5 7. dxc5 Nc6 8. Bd6 b6 9. a3 Bxc5 10. Bg3 h6 11. Qf3 e5 12. Bf5 e4 13. Qf4 g5 14. Qc7 Qxc7 15. Bxc7 Bxf5 16. gxf5 Rc8 17. Bg3 0-0 18. Nge2 d4 19. exd4 Nxd4 20. Nxd4 Bxd4 21. Ne2 Bxb2 22. Ra2 Bc3+ 23. Nxc3 Rxc3 24. h4 e3 25. Be5 exf2+ 26. Kf1 Re3 27. Bxf6 Re1+ 28. Kxf2 Rxh1 29. hxg5 hxg5 30. Bxg5 Rh5 31. Bf4 Rxf5 32. Kf3 Rc8 33. Ke4 Rfc5 34. Ra1 Rc4+ 35. Kf5 R8c5+ 36. Be5 Rxc2 37. Rg1+ Kf8 38. Re1 Ke7 0-1

[Event "Maastricht Limburg op 14th"]
[Site "Maastricht"]
[Date "2022.06.05"]
[Round "5"]
[White "Kopylov, Daniel"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "2326"]
[BlackElo "2104"]
[PlyCount "92"]
[EventDate "2022.06.03"]
[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. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Na3 cxd4 7. cxd4 Bd7 8. Nc2 Rc8 9. Be2 Bb4+ 10. Kf1 Na5 11. g3 Ba4 12. b3 Bb5 13. Kg2 Nc6 14. Bxb5 Qxb5 15. a4 Qb6 16. Qd3 Nge7 17. Nxb4 Nxb4 18. Qb5+ Nec6 19. Bd2 0-0 20. Rhc1 Na6 21. b4 Ncxb4 22. Rxc8 Rxc8 23. Rc1 Rc6 24. Rb1 Nc2 25. Ba5 Nxd4 26. Qxb6 axb6 27. Nxd4 Rc4 28. Bxb6 Rxa4 29. Rc1 f6 30. exf6 e5 31. Rc8+ Kf7 32. fxg7 Kxg7 33. Ne6+ Kf6 34. Nc5 Nxc5 35. Rxc5 Ra6 36. Bd8+ Ke6 37. Rc7 Rd6 38. Re7+ Kf6 39. Rd7+ Ke6 40. Rxd6+ Kxd6 41. Kf3 b5 42. Ke3 Kc5 43. f4 d4+ 44. Kd3 Kd5 45. fxe5 Kxe5 46. Bb6 Kf5 1-0

[Event "Maastricht Limburg op 14th"]
[Site "Maastricht"]
[Date "2022.06.04"]
[Round "3"]
[White "Van Dael, Siem"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C13"]
[WhiteElo "2317"]
[BlackElo "2104"]
[PlyCount "26"]
[EventDate "2022.06.03"]
[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. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 gxf6 7. Nf3 f5 8. Nc3 Bf6 9. Qd2 c6 10. 0-0-0 Nd7 11. h3 h5 12. Kb1 Nb6 13. Bd3 Bg7 1-0

[Event "Utrecht Keres Memorial"]
[Site "Utrecht"]
[Date "2022.05.29"]
[Round "6"]
[White "Roorda, Thijs"]
[Black "Haver, Daan"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "2097"]
[BlackElo "2165"]
[PlyCount "53"]
[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. Nc3 Bf5 3. Bf4 Nf6 4. e3 e6 5. Nb5 Na6 6. Nf3 Be7 7. Ne5 Nd7 8. g4 Be4 9. Rg1 c5 10. c3 0-0 11. f3 Bg6 12. Nxg6 fxg6 13. g5 Qb6 14. a4 c4 15. h4 e5 16. Bh2 exd4 17. Qxd4 Bc5 18. Qxd5+ Kh8 19. Qxd7 Rad8 20. a5 Bxe3 21. axb6 Rxd7 22. bxa7 Bxg1 23. Bxg1 Re8+ 24. Kf2 Rd2+ 25. Kg3 Rxb2 26. Nd6 Rf8 27. Bxc4 1-0

[Event "Utrecht Keres Memorial"]
[Site "Utrecht"]
[Date "2022.05.28"]
[Round "5"]
[White "Roorda, Thijs"]
[Black "Kools, Thomas"]
[Result "1-0"]
[ECO "D46"]
[WhiteElo "2097"]
[BlackElo "2160"]
[PlyCount "67"]
[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. Nf3 Nf6 3. c4 e6 4. e3 c6 5. Nbd2 Be7 6. Bd3 Nbd7 7. 0-0 0-0 8. e4 dxe4 9. Nxe4 c5 10. Qe2 Nxe4 11. Bxe4 cxd4 12. Nxd4 Nf6 13. Rd1 Nxe4 14. Qxe4 e5 15. Qxe5 Bg4 16. Rd3 Bf6 17. Qg3 Bh5 18. Nb5 Qe7 19. Bd2 Bg6 20. Rd5 Qe2 21. Qb3 Rae8 22. h3 Re4 23. Nc3 Bxc3 24. Bxc3 Qxc4 25. Qxb7 Rfe8 26. Rad1 Qxa2 27. Rd8 R4e6 28. Ra8 Qa4 29. b3 Qh4 30. Rd4 Qg5 31. Bd2 Qf5 32. Rdd8 f6 33. Rxa7 Rxd8 34. Qxg7# 1-0

[Event "NED-chT Promotion Liga 1"]
[Site "Netherlands"]
[Date "2021.06.12"]
[Round "1.1"]
[White "Ratsma, Midas"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C18"]
[WhiteElo "2245"]
[BlackElo "2092"]
[PlyCount "81"]
[EventDate "2021.06.12"]
[EventType "team-k.o."]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]
[WhiteTeam "De Waagtoren"]
[BlackTeam "Leiden Philidor"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. Bd3 g6 9. Nf3 Bd7 10. Bg5 cxd4 11. 0-0 dxc3 12. Bf6 Rg8 13. Qh4 Nbc6 14. Rab1 h5 15. Rb3 d4 16. Nxd4 Nxd4 17. Qxd4 Nd5 18. Be4 Bc6 19. Bxd5 exd5 20. Rxc3 Qd7 21. e6 fxe6 22. Re1 Qf7 23. Rxe6+ Qxe6 24. Re3 Qxe3 25. Qxe3+ Kd7 26. Qe7+ Kc8 27. Qf7 Re8 28. f4 a5 29. Be5 Bd7 30. Qxg6 Ra6 31. Qxh5 a4 32. Qf7 Ree6 33. h4 Rac6 34. h5 Be8 35. Qg8 Kd7 36. c3 Ke7 37. f5 Rxe5 38. Qg7+ Kd6 39. Qf6+ Kc5 40. Qxe5 Bxh5 41. g4 1-0

[Event "Leiden Noteboom op 80th"]
[Site "Leiden"]
[Date "2020.02.29"]
[Round "2"]
[White "Pijpers, Arthur"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "B03"]
[WhiteElo "2470"]
[BlackElo "2112"]
[PlyCount "41"]
[EventDate "2020.02.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 195 Extra"]
[Source "ChessBase"]
[SourceDate "2020.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2020.05.31"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 Nb6 4. Nf3 d5 5. Bd3 Bg4 6. Nbd2 e6 7. h3 Bh5 8. Nb3 N8d7 9. 0-0 Be7 10. Be3 f6 11. exf6 Bxf6 12. g4 Bf7 13. c3 g5 14. Na5 Rb8 15. Qd2 h6 16. Rae1 c6 17. h4 Qc7 18. Kg2 h5 19. Nxg5 Bxg5 20. hxg5 hxg4 21. Bf4 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.01.24"]
[Round "4"]
[White "Hensbergen, Willem"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A85"]
[WhiteElo "2062"]
[BlackElo "2108"]
[PlyCount "34"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. Nc3 Nf6 4. Bg5 Bb4 5. Rc1 h6 6. Bxf6 Qxf6 7. a3 Bxc3+ 8. Rxc3 b6 9. Nf3 Bb7 10. e3 d6 11. Be2 Nd7 12. 0-0 0-0 13. b4 c5 14. Rd3 cxb4 15. axb4 Rfc8 16. c5 dxc5 17. dxc5 Ne5 1/2-1/2

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.12.20"]
[Round "3"]
[White "Roorda, Thijs"]
[Black "Van der Werf, Mark"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "2108"]
[BlackElo "2391"]
[PlyCount "63"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 d5 3. Bf4 e6 4. e3 Bb4 5. Bd3 c5 6. dxc5 Nbd7 7. Nge2 a6 8. a3 Bxc5 9. e4 d4 10. Nb1 e5 11. Bc1 0-0 12. Ng3 Re8 13. 0-0 Nf8 14. b4 Ba7 15. Nh5 Nxh5 16. Qxh5 Ng6 17. f4 exf4 18. Bxf4 Be6 19. Nd2 Rc8 20. e5 Rxc2 21. Ne4 Bd5 22. Kh1 Bxe4 23. Bxe4 d3 24. Rad1 Rc3 25. Rf3 Qd4 26. Qf5 d2 27. Be3 Qxe5 28. Qxf7+ Kh8 29. Bxg6 Rcc8 30. Rh3 h5 31. Bxd2 Rf8 32. Bxh5 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.29"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Van Wessel, Rudy"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "2108"]
[BlackElo "2368"]
[PlyCount "73"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 d5 3. Bf4 e6 4. e3 a6 5. g4 h6 6. Bg2 c5 7. h4 Bd6 8. dxc5 Bxf4 9. exf4 Qc7 10. g5 Nfd7 11. Qd4 Kf8 12. 0-0-0 Nc6 13. Qd2 Ne7 14. Nge2 Nxc5 15. Nd4 b5 16. f5 b4 17. Nce2 Rb8 18. fxe6 fxe6 19. Qe3 e5 20. Nb3 Nxb3+ 21. axb3 Bf5 22. Rd2 Rc8 23. Bh3 Bxc2 24. Bxc8 Be4+ 25. Kd1 Bxh1 26. Rc2 Qd6 27. Ng3 d4 28. Qd3 Bd5 29. Bxa6 hxg5 30. h5 Rh6 31. Bc4 g4 32. Nf5 Nxf5 33. Qxf5+ Ke7 34. Bxd5 Qxd5 35. Rc7+ Ke8 36. Rc8+ Ke7 37. Qf8+ 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.08"]
[Round "1"]
[White "Hubert, Michel1"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "A96"]
[WhiteElo "1840"]
[BlackElo "2108"]
[PlyCount "70"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Ne4 8. Bd2 Nc6 9. Qc2 d5 10. cxd5 exd5 11. Bf4 Be6 12. Rfd1 Rc8 13. Ne5 Qe8 14. f3 Nd6 15. e4 dxe4 16. fxe4 Nxe5 17. Bxe5 Nc4 18. exf5 Ne3 19. Qd3 Nxd1 20. fxe6 Nxc3 21. bxc3 c6 22. c4 Qh5 23. Re1 Bf6 24. Bxf6 Rxf6 25. d5 Re8 26. d6 Qa5 27. Re2 Rfxe6 28. Rxe6 Rxe6 29. d7 Qd8 30. Bh3 Rf6 31. c5 Rf8 32. Qb3+ Kh8 33. Qe6 Qg5 34. Qe8 Qc1+ 35. Kg2 Qf1# 0-1

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.21"]
[Round "9"]
[White "Ikonnikov, Vyacheslav"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A96"]
[WhiteElo "2499"]
[BlackElo "2108"]
[PlyCount "109"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Ne4 8. Nxe4 fxe4 9. Nd2 d5 10. f3 dxc4 11. Nxe4 Nd7 12. Be3 b5 13. a4 b4 14. Bf2 a5 15. Qc2 Nb6 16. f4 Rb8 17. Nc5 Qe8 18. b3 c3 19. Qd3 c6 20. Be4 g6 21. h4 Nd5 22. h5 gxh5 23. Bxh7+ Kh8 24. Bg6 Nxf4 25. Bxe8 Nxd3 26. Bxc6 Nxf2 27. Rxf2 Rxf2 28. Kxf2 Bxc5 29. dxc5 Bb7 30. Bxb7 Rxb7 31. Rh1 Kg7 32. Ke3 Rd7 33. Rh4 Kf6 34. Rc4 Ke5 35. c6 Rc7 36. Rc5+ Kd6 37. Rxh5 Rxc6 38. Rh1 c2 39. Kd2 Rc3 40. g4 Ke7 41. g5 Kf7 42. Kc1 Rxb3 43. Kxc2 Ra3 44. Rh7+ Kg6 45. Rh6+ Kxg5 46. Rxe6 Rxa4 47. Re3 Ra2+ 48. Kb1 Rd2 49. Re5+ Kf4 50. Rxa5 Rxe2 51. Rb5 Re4 52. Kb2 Ke3 53. Kb3 Ke2 54. Rxb4 Rxb4+ 55. Kxb4 1/2-1/2

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.20"]
[Round "8"]
[White "Roorda, Thijs"]
[Black "De Jong, Migchiel"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "2108"]
[BlackElo "2345"]
[PlyCount "83"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 e6 2. e4 d5 3. Nc3 Bb4 4. exd5 exd5 5. Bd3 Nc6 6. Nf3 Bg4 7. a3 Bxc3+ 8. bxc3 Nf6 9. Rb1 Qe7+ 10. Kf1 0-0-0 11. a4 Ne4 12. Bxe4 dxe4 13. h3 Bh5 14. g4 Bg6 15. Ne1 h5 16. Ng2 Ne5 17. Qe2 Nf3 18. Qb5 c6 19. Qa5 Kb8 20. Ne3 Qe6 21. Qa6 Rd7 22. Nc4 e3 23. Bxe3 Kc8 24. Nb6+ axb6 25. Qa8+ Kc7 26. Bf4+ Rd6 27. Qxh8 Bxc2 28. Rc1 Bd3+ 29. Kg2 hxg4 30. Qf8 Nh4+ 31. Kh2 g3+ 32. Bxg3 Nf5 33. Rhe1 Be4 34. Bxd6+ Nxd6 35. Qxg7 Qa2 36. Qg3 f5 37. c4 c5 38. dxc5 bxc5 39. Red1 Kb6 40. Qxd6+ Bc6 41. Qd8+ Ka6 42. Qa8+ 1-0

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.19"]
[Round "7"]
[White "Damen, Jip"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A96"]
[WhiteElo "2179"]
[BlackElo "2108"]
[PlyCount "87"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. Nf3 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. 0-0 0-0 6. d4 d6 7. b3 Ne4 8. Bb2 Bf6 9. Nbd2 Nc6 10. e3 Qe7 11. Ne1 Nxd2 12. Qxd2 e5 13. Nc2 a5 14. dxe5 Nxe5 15. Nd4 Kh8 16. Ne2 Bd7 17. Nf4 Bc6 18. Nd5 Bxd5 19. cxd5 Nd7 20. Rac1 Bxb2 21. Qxb2 Nc5 22. Rc4 b5 23. Rc2 b4 24. Rc4 Qf6 25. Qc2 Qe5 26. h4 Rae8 27. Rc1 Re7 28. Qd1 g6 29. Ra1 Rg7 30. Qd4 Qf6 31. Rb1 Re7 32. Qd2 Rb8 33. Kh2 Qg7 34. a3 bxa3 35. Qxa5 Rxb3 36. Rxb3 Nxb3 37. Qxa3 Nc5 38. Rb4 Re8 39. Qa7 Qf7 40. h5 gxh5 41. Rh4 Ne4 42. Rf4 Kg8 43. Qd4 Re5 44. Bxe4 1/2-1/2

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.18"]
[Round "6"]
[White "Roorda, Thijs"]
[Black "Ivanov, Sergey"]
[Result "1/2-1/2"]
[ECO "D00"]
[WhiteElo "2108"]
[BlackElo "2496"]
[PlyCount "108"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 d5 3. Bf4 e6 4. e3 a6 5. g4 c5 6. g5 Nfd7 7. Nf3 Nc6 8. h4 b5 9. Bg2 Bb7 10. 0-0 Be7 11. e4 cxd4 12. Nxd5 e5 13. Bg3 h6 14. c3 dxc3 15. bxc3 hxg5 16. hxg5 Rc8 17. a4 bxa4 18. Qb1 Ba8 19. Rd1 Qa5 20. Qa2 Qc5 21. Qxa4 a5 22. Rab1 Rh5 23. Rb5 Qa3 24. Qc4 Kf8 25. Nxe7 Qxe7 26. Nxe5 Ndxe5 27. Rxe5 Qb7 28. Rc5 Kg8 29. e5 Rxg5 30. Rxc6 Rxc6 31. Rd8+ Kh7 32. Qh4+ Rh6 33. Bxb7 Bxb7 34. Qxh6+ Kxh6 35. Rd7 Bc6 36. Rxf7 Rg4 37. Rf4 Rxf4 38. Bxf4+ Kg6 39. Bd2 Kf5 40. c4 a4 41. Bc3 Ke4 42. Ba1 Kd3 43. Kh2 Kxc4 44. Kg3 Kd5 45. Kf4 Ke6 46. Kg5 Be4 47. f4 a3 48. Bc3 a2 49. Bb2 g6 50. Ba1 Bf5 51. Bb2 Kd5 52. Kf6 Ke4 53. e6 Bxe6 54. Kxg6 Kxf4 1/2-1/2

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.17"]
[Round "5"]
[White "Lai, Hing Ting"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A04"]
[WhiteElo "2460"]
[BlackElo "2108"]
[PlyCount "90"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. Nf3 f5 2. d3 d6 3. e4 e5 4. Nc3 Nf6 5. exf5 Bxf5 6. d4 e4 7. Nh4 Qd7 8. Bg5 Be7 9. Bxf6 Bxf6 10. Nxf5 Qxf5 11. g4 Qa5 12. g5 Bxg5 13. Bb5+ Kd8 14. Qg4 Bf6 15. Qxe4 a6 16. Ba4 c6 17. 0-0-0 Nd7 18. Qe6 Kc7 19. h4 Rae8 20. Qg4 h5 21. Qg6 Re7 22. Kb1 Nf8 23. Qg3 Qf5 24. Bb3 Ng6 25. f3 Re3 26. Rhg1 Nxh4 27. Ne4 Rd8 28. Nxf6 Qxf6 29. Qxg7+ Qxg7 30. Rxg7+ Rd7 31. Rxd7+ Kxd7 32. Bf7 Nf5 33. Bxh5 Nxd4 34. Rg1 Nxf3 35. Bxf3 Rxf3 36. Rg7+ Ke6 37. b3 Rf7 38. Rg8 d5 39. Kb2 Kd6 40. Rg6+ Kc5 41. Rg5 a5 42. a4 Re7 43. Rh5 b5 44. axb5 cxb5 45. Rh8 Rd7 1/2-1/2

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.15"]
[Round "4"]
[White "Roorda, Thijs"]
[Black "De Niet, Gert Michiel"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "2108"]
[BlackElo "2208"]
[PlyCount "81"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 d5 3. Bf4 c6 4. e3 Bf5 5. f3 e6 6. g4 Bg6 7. h4 h6 8. Bd3 Bxd3 9. Qxd3 Qa5 10. Nge2 b5 11. Nc1 Nbd7 12. Kf2 Qd8 13. Nb3 Rc8 14. e4 b4 15. exd5 Nxd5 16. Nxd5 cxd5 17. g5 Qb6 18. g6 f6 19. Rae1 Rc6 20. Re2 Kd8 21. Kg2 Be7 22. h5 a5 23. Rhe1 a4 24. Nd2 Bd6 25. Bxd6 Rxd6 26. c4 bxc3 27. bxc3 Re8 28. f4 Qa6 29. Qxa6 Rxa6 30. c4 dxc4 31. Nxc4 Rc6 32. Ne3 Nb6 33. Rb2 Kd7 34. Kf2 Rec8 35. f5 exf5 36. d5 Rd6 37. Nxf5 Rxd5 38. Ne7 Re5 39. Rxe5 fxe5 40. Nxc8 Nxc8 41. Rb7+ 1-0

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.14"]
[Round "3"]
[White "Berrevoets, Jeroen"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "C06"]
[WhiteElo "1987"]
[BlackElo "2108"]
[PlyCount "52"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ngf3 Be7 8. 0-0 g5 9. h3 h5 10. g4 hxg4 11. hxg4 Qb6 12. Qb3 Qc7 13. Qc2 Nf8 14. Re1 cxd4 15. cxd4 Qb6 16. Nb3 Bd7 17. Bd2 a5 18. Rac1 Rh3 19. Be2 Rxf3 20. Bxf3 a4 21. Nc5 Nxd4 22. Nxd7 Nxf3+ 23. Kf1 Qb5+ 24. Kg2 Nxe1+ 25. Bxe1 Qxd7 26. Bd2 Ng6 0-1

[Event "Leiden op-A 13th"]
[Site "Leiden"]
[Date "2019.07.13"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Van Vliet, Jeffrey"]
[Result "0-1"]
[ECO "E05"]
[WhiteElo "2108"]
[BlackElo "2380"]
[PlyCount "108"]
[EventDate "2019.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. g3 d5 4. Bg2 Be7 5. 0-0 0-0 6. c4 dxc4 7. Qc2 a6 8. a4 c5 9. Rd1 Nc6 10. e3 cxd4 11. exd4 Bd7 12. Qxc4 Rc8 13. Qe2 Na5 14. Nbd2 Bc6 15. Bf1 Bd5 16. Ne5 Qb6 17. Qe3 Rfd8 18. b4 Bxb4 19. Rb1 Qd6 20. Bd3 Qe7 21. Ndf3 h6 22. h4 Nc4 23. Nxc4 Bxc4 24. Bxc4 Rxc4 25. Qb3 Rc3 26. Qxb4 Qxb4 27. Rxb4 Rxf3 28. Kg2 Rc3 29. Rxb7 Rc4 30. a5 Ra4 31. Bf4 Nd5 32. Bc7 Rc8 33. Bb6 Rc2 34. Rd3 Rb2 35. Ra7 g5 36. Rf3 f5 37. hxg5 hxg5 38. g4 Ra1 39. Bc7 f4 40. Be5 Ne3+ 41. Kh2 Nxg4+ 42. Kg2 Ne3+ 43. Kh2 Rbb1 44. Rxe3 fxe3 45. fxe3 Rxa5 46. Kg3 Rg1+ 47. Kf3 Ra2 48. Re7 g4+ 49. Kf4 g3 50. Kg5 g2 51. Bd6 Rf1 52. Re8+ Kg7 53. Re7+ Rf7 54. Be5+ Kf8 0-1

[Event "Pula op 33rd"]
[Site "Pula"]
[Date "2019.06.25"]
[Round "5"]
[White "Roorda, Thijs"]
[Black "Jelen, Igor"]
[Result "0-1"]
[ECO "D77"]
[WhiteElo "2111"]
[BlackElo "2353"]
[PlyCount "94"]
[EventDate "2019.06.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "CBM 191 Extra"]
[Source "ChessBase"]
[SourceDate "2019.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2019.09.30"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 0-0 5. 0-0 d5 6. c4 dxc4 7. Na3 Nc6 8. Nxc4 Be6 9. b3 a5 10. Bb2 a4 11. Ng5 Bd5 12. e4 Bxc4 13. bxc4 a3 14. Bc3 Nd7 15. Nf3 Nb6 16. Qd3 Nxd4 17. Nxd4 c5 18. Rfd1 cxd4 19. Bxd4 Bxd4 20. Qxd4 Qxd4 21. Rxd4 e5 22. Rd3 Nxc4 23. Rb3 Rfb8 24. Rd1 b5 25. Bf1 Nb2 26. Rd5 b4 27. Rxe5 Na4 28. Bc4 Nc3 29. Re7 Kh8 30. Rxf7 Ra5 31. Rc7 Nxe4 32. Re3 Rc5 33. Rxc5 Nxc5 34. Re5 Rc8 35. Re1 Kg7 36. Rb1 Rb8 37. Kf1 Ne4 38. Rd1 Kf6 39. f4 Rc8 40. Bb3 Rc3 41. Rd7 g5 42. Rb7 Nd2+ 43. Ke2 Nxb3 44. Rb6+ Kf5 45. axb3 Rxb3 46. Rb5+ Ke4 47. Kd2 a2 0-1

[Event "Pula op 33rd"]
[Site "Pula"]
[Date "2019.06.23"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Saric, Ante"]
[Result "0-1"]
[ECO "D73"]
[WhiteElo "2111"]
[BlackElo "2542"]
[PlyCount "54"]
[EventDate "2019.06.22"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "CBM 191 Extra"]
[Source "ChessBase"]
[SourceDate "2019.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2019.09.30"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. g3 c6 4. Bg2 g6 5. 0-0 Bg7 6. c4 dxc4 7. a4 Ne4 8. Na3 c3 9. bxc3 Nxc3 10. Qc2 Nd5 11. Rd1 0-0 12. Nc4 Nb4 13. Qb1 a5 14. e4 Bg4 15. Be3 Nd7 16. Ra3 b6 17. h3 Bxf3 18. Bxf3 Qc7 19. e5 Rad8 20. Qe4 c5 21. Rc1 cxd4 22. Bxd4 Nc5 23. Bxc5 Qxc5 24. Qe3 Qxe3 25. fxe3 Nd3 26. Rf1 Nxe5 27. Nxb6 Rd6 0-1

[Event "Leiden Noteboom Memorial 79th"]
[Site "Leiden"]
[Date "2019.02.23"]
[Round "3"]
[White "Roorda, Thijs"]
[Black "Cheung, Jan W"]
[Result "1-0"]
[ECO "B89"]
[WhiteElo "2110"]
[BlackElo "2015"]
[PlyCount "59"]
[EventDate "2019.02.22"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 189 Extra"]
[Source "ChessBase"]
[SourceDate "2019.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2019.05.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 e6 7. Be3 Be7 8. Qe2 a6 9. 0-0-0 Qc7 10. g4 Na5 11. Bd3 b5 12. g5 Nd7 13. f4 b4 14. Nb1 Nc5 15. Nd2 Nxd3+ 16. Qxd3 Bd7 17. Kb1 0-0 18. f5 Bb5 19. Nxb5 axb5 20. f6 gxf6 21. gxf6 Bxf6 22. Bh6 Nc4 23. Nxc4 bxc4 24. Qg3+ Kh8 25. Bxf8 Qa7 26. a3 Bxb2 27. Bxd6 Bc3 28. Be5+ Bxe5 29. Qxe5+ Kg8 30. Rhg1+ 1-0

[Event "Leiden Noteboom Memorial 79th"]
[Site "Leiden"]
[Date "2019.02.22"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Achuthan, Dylan"]
[Result "1-0"]
[ECO "B30"]
[WhiteElo "2110"]
[BlackElo "1863"]
[PlyCount "63"]
[EventDate "2019.02.22"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 189 Extra"]
[Source "ChessBase"]
[SourceDate "2019.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2019.05.31"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 Nc6 3. Bb5 e6 4. 0-0 Nge7 5. Re1 a6 6. Bf1 g6 7. c3 Bg7 8. d4 cxd4 9. cxd4 d6 10. Na3 0-0 11. h4 h5 12. Be3 b5 13. Nc2 Bb7 14. Qd2 Kh7 15. a4 Na5 16. Qd3 bxa4 17. Rxa4 Bc6 18. Ra2 Bb5 19. Qc3 Nec6 20. b4 Rc8 21. bxa5 Nxd4 22. Ng5+ Qxg5 23. Qxd4 Qxh4 24. Qxd6 Bxf1 25. Rxf1 Qxe4 26. Ne1 Be5 27. Nf3 Qc4 28. Qxe5 Qxa2 29. Qg5 Kg8 30. Qf6 Kh7 31. Ng5+ Kg8 32. Bd4 1-0

[Event "Leiden op-A 12th"]
[Site "Leiden"]
[Date "2018.07.21"]
[Round "8"]
[White "De Waele, Warre"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "2255"]
[BlackElo "2109"]
[PlyCount "45"]
[EventDate "2018.07.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 185 Extra"]
[Source "ChessBase"]
[SourceDate "2018.07.29"]
[SourceVersion "1"]
[SourceVersionDate "2018.07.29"]
[SourceQuality "1"]

1. Nf3 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. 0-0 0-0 6. d4 d6 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3 a5 10. b3 Bf6 11. Bb2 Qe8 12. Qd3 Nc6 13. e4 e5 14. dxe5 dxe5 15. Rfe1 f4 16. gxf4 exf4 17. e5 Be7 18. e6 Ra6 19. Rad1 Bf6 20. Bxf6 Rxf6 21. Ng5 g6 22. Bxc6 Qxc6 23. e7 1-0

[Event "Leiden op-A 12th"]
[Site "Leiden"]
[Date "2018.07.18"]
[Round "5"]
[White "Roorda, Thijs"]
[Black "Maiorov, Nikita"]
[Result "0-1"]
[ECO "E18"]
[WhiteElo "2109"]
[BlackElo "2526"]
[PlyCount "100"]
[EventDate "2018.07.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 185 Extra"]
[Source "ChessBase"]
[SourceDate "2018.07.29"]
[SourceVersion "1"]
[SourceVersionDate "2018.07.29"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 b6 3. g3 Bb7 4. Bg2 e6 5. 0-0 Be7 6. Nc3 0-0 7. d4 Ne4 8. Nxe4 Bxe4 9. Ne1 Bxg2 10. Nxg2 c5 11. d5 exd5 12. Qxd5 Nc6 13. Rd1 Bf6 14. e3 Qc8 15. Nf4 Re8 16. Qf5 Ne5 17. Nd5 Qc6 18. Rb1 Nxc4 19. b3 Ne5 20. f4 Ng6 21. Qxd7 Qxd7 22. Nxf6+ gxf6 23. Rxd7 Red8 24. Rd2 f5 25. Kf2 Kf8 26. Rbb2 Ke7 27. Kf3 Ke6 28. Rbc2 Ne7 29. Re2 Nc6 30. Rcd2 Rac8 31. Bb2 Rxd2 32. Rxd2 Rd8 33. Rxd8 Nxd8 34. h3 Nb7 35. g4 Nd6 36. Be5 Ne4 37. Ke2 b5 38. Bb2 fxg4 39. hxg4 f5 40. g5 Kd5 41. Ba1 a5 42. Kd3 a4 43. Bb2 Nd6 44. Be5 axb3 45. axb3 c4+ 46. bxc4+ bxc4+ 47. Kc3 Ne4+ 48. Kb4 Nxg5 49. Bf6 Nf3 50. Kc3 h5 0-1

[Event "Leiden op-A 12th"]
[Site "Leiden"]
[Date "2018.07.14"]
[Round "2"]
[White "Viani, Antonio Dcunha"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C00"]
[WhiteElo "2404"]
[BlackElo "2109"]
[PlyCount "61"]
[EventDate "2018.07.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 185 Extra"]
[Source "ChessBase"]
[SourceDate "2018.07.29"]
[SourceVersion "1"]
[SourceVersionDate "2018.07.29"]
[SourceQuality "1"]

1. e4 e6 2. d3 b6 3. g3 Bb7 4. Bg2 g6 5. Nc3 Bg7 6. Nf3 Ne7 7. Bf4 d6 8. d4 Qd7 9. Qe2 Nbc6 10. 0-0-0 0-0-0 11. h4 h6 12. Rhe1 Rde8 13. Qd2 Kb8 14. Bf1 a6 15. a3 d5 16. exd5 exd5 17. Bg2 Nf5 18. Bh3 Bc8 19. Ne5 Nxe5 20. dxe5 d4 21. Ne2 Bxe5 22. Bxe5 Rxe5 23. Nxd4 Rxe1 24. Qxe1 Re8 25. Qh1 Bb7 26. Nxf5 Qc8 27. Ne3 Bxh1 28. Bxc8 Bf3 29. Bd7 Rd8 30. Rd2 f5 31. Be6 1-0

[Event "Leiden op-A 12th"]
[Site "Leiden"]
[Date "2018.07.13"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Ricken, Katharina"]
[Result "1-0"]
[ECO "A04"]
[WhiteElo "2109"]
[BlackElo "1776"]
[PlyCount "65"]
[EventDate "2018.07.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 185 Extra"]
[Source "ChessBase"]
[SourceDate "2018.07.29"]
[SourceVersion "1"]
[SourceVersionDate "2018.07.29"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 g6 3. Bg2 Bg7 4. d4 cxd4 5. Nxd4 Nc6 6. Nxc6 bxc6 7. 0-0 Nf6 8. c4 0-0 9. Qa4 Qb6 10. Nc3 Bb7 11. Be3 Qc7 12. Rac1 d6 13. b4 Nd7 14. Rfd1 Rfc8 15. Bh3 Rd8 16. Nd5 cxd5 17. cxd5 Nb6 18. Rxc7 Nxa4 19. Rxb7 Nc3 20. Rd2 Ne4 21. Rc2 Nc3 22. Bg2 Rdc8 23. Rxe7 a5 24. bxa5 Rxa5 25. Bh3 Rca8 26. Rc7 Rxa2 27. R2xc3 Bxc3 28. Rxc3 Rxe2 29. Rc6 Raa2 30. Bd4 Kf8 31. Rxd6 Ke7 32. Bc5 Rec2 33. Rc6+ 1-0

[Event "Utrecht OKU op 45th"]
[Site "Utrecht"]
[Date "2018.06.02"]
[Round "2"]
[White "Geurink, Jasper"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "C02"]
[WhiteElo "2348"]
[BlackElo "2131"]
[PlyCount "88"]
[EventDate "2018.06.01"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2019"]
[Source "ChessBase"]
[SourceDate "2018.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2018.10.10"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7 6. a3 f6 7. Bd3 fxe5 8. Nxe5 Nxe5 9. dxe5 Ne7 10. 0-0 g6 11. c4 Bg7 12. Nc3 d4 13. Ne4 0-0 14. f4 b6 15. Qe2 Bc6 16. g4 Rc8 17. Bd2 Rc7 18. b4 Bxe4 19. Qxe4 Nc6 20. g5 Qc8 21. b5 Ne7 22. a4 Nf5 23. a5 h6 24. gxh6 Bxh6 25. axb6 axb6 26. Ra6 Rb7 27. Kh1 Rff7 28. Rg1 Kh7 29. Qg2 Rg7 30. Be4 Rb8 31. Rga1 Qd8 32. Ra7 Qh4 33. Rxg7+ Bxg7 34. Rg1 Qh5 35. Qf1 Rf8 36. Qd3 Bh6 37. Ra1 Rf7 38. Rf1 Ra7 39. Rg1 Ra2 40. Bc6 Ne3 41. Be4 Nf5 42. Bc6 Ne3 43. Be4 Nf5 44. Bc6 Ne3 1/2-1/2

[Event "Delft Prinsenstad op 11th"]
[Site "Delft"]
[Date "2018.04.01"]
[Round "6"]
[White "Lopez, Jasel"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "A40"]
[WhiteElo "2333"]
[BlackElo "2120"]
[PlyCount "100"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 e6 2. Bf4 f5 3. h3 Nf6 4. g4 c5 5. e3 cxd4 6. exd4 Qb6 7. Nd2 Qxd4 8. Be3 Qxb2 9. Rb1 Qc3 10. Ngf3 Nc6 11. Rb3 Qa5 12. gxf5 Qxf5 13. Bd3 Qa5 14. Rb5 Qc7 15. Ng5 Nb4 16. Bxh7 Rxh7 17. Nxh7 Qc6 18. Nxf6+ gxf6 19. Qh5+ Kd8 20. 0-0 b6 21. Qf3 Qxf3 22. Nxf3 Ba6 23. Rxb4 Bxb4 24. Rb1 Bd6 25. Nd2 Ke7 26. f4 Rc8 27. Ne4 Rxc2 28. Nxd6 Kxd6 29. a4 Kd5 30. a5 Ke4 31. axb6 axb6 32. Bxb6 Kxf4 33. Ra1 Bb7 34. Ra4+ Kg3 35. Bf2+ Rxf2 36. Rg4+ Kxh3 37. Rg3+ Kh4 38. Kxf2 Bc6 39. Rg7 f5 40. Rg8 f4 41. Ke2 e5 42. Kd3 d5 43. Ke2 e4 44. Kf2 d4 45. Rd8 d3 46. Rd4 e3+ 47. Kg1 d2 48. Rxf4+ Kg3 49. Rd4 e2 50. Rd3+ Bf3 0-1

[Event "Delft Prinsenstad op 11th"]
[Site "Delft"]
[Date "2018.04.01"]
[Round "5"]
[White "Roorda, Thijs"]
[Black "Arnaudov, Petar G"]
[Result "0-1"]
[ECO "A75"]
[WhiteElo "2120"]
[BlackElo "2449"]
[PlyCount "68"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 d6 4. Nc3 g6 5. e4 Bg7 6. Nf3 0-0 7. Be2 e6 8. 0-0 exd5 9. cxd5 a6 10. a4 Bg4 11. Re1 Bxf3 12. Bxf3 Re8 13. Bf4 Qc7 14. g4 h6 15. h4 Nbd7 16. Bg2 Ne5 17. Bxe5 Rxe5 18. f4 Ree8 19. Bf3 c4 20. Kg2 Nd7 21. Qc2 Nc5 22. Be2 Bxc3 23. Qxc3 Rxe4 24. Bxc4 Rae8 25. Rxe4 Rxe4 26. Kf3 Qe7 27. b4 Qxh4 28. Bf1 g5 29. bxc5 Rxf4+ 30. Ke2 Qf2+ 31. Kd1 Qxf1+ 32. Kc2 Qg2+ 33. Kc1 Rf1+ 34. Qe1 Rxe1# 0-1

[Event "Delft Prinsenstad op 11th"]
[Site "Delft"]
[Date "2018.03.31"]
[Round "3"]
[White "Timmerman, Gert Jan"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "C18"]
[WhiteElo "2194"]
[BlackElo "2120"]
[PlyCount "110"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Ne7 5. a3 Bxc3+ 6. bxc3 c5 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2 Nbc6 11. f4 dxc3 12. Qd3 d4 13. Rb1 Bd7 14. h3 Nf5 15. g4 Nh4 16. Qh7 Nf3+ 17. Kf2 0-0-0 18. Kxf3 Nxe5+ 19. Kf2 Bc6 20. fxe5 Bxh1 21. Qd3 Qxe5 22. Bf4 Qe4 23. Qc4+ Qc6 24. Qxc6+ Bxc6 25. Ng3 f6 26. Bd3 e5 27. Bf5+ Kb8 28. Bh6 Rh8 29. g5 fxg5 30. Bg7 Rh4 31. Bxe5+ Ka8 32. Re1 Rf8 33. Kg1 Rf4 34. Be4 Re8 35. Bxc6 bxc6 36. Re2 Rf3 37. Kg2 d3 38. Kxf3 dxe2 39. Bxc3 e1Q 40. Bxe1 Rxe1 41. Ne4 Rg1 42. c3 Kb8 43. Kf2 Rc1 44. Kf3 Kc7 45. Kg4 Kd7 46. Kxg5 Ke6 47. Kf4 Kd5 48. Nd2 Rxc3 49. h4 Rxa3 50. h5 Rh3 51. Kg4 Rh1 52. Nf3 a5 53. Kg5 a4 54. h6 a3 55. Nd2 a2 0-1

[Event "Delft Prinsenstad op 11th"]
[Site "Delft"]
[Date "2018.03.30"]
[Round "1"]
[White "Meng, Roger"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "2415"]
[BlackElo "2120"]
[PlyCount "69"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 f5 3. g3 Nf6 4. Bg2 Be7 5. 0-0 0-0 6. c4 d6 7. Nc3 Ne4 8. Bd2 c5 9. dxc5 Nxc5 10. b4 Nca6 11. a3 Nc7 12. Qb3 a5 13. Rad1 axb4 14. axb4 Bd7 15. Bf4 e5 16. Be3 Nc6 17. Bb6 Qc8 18. Bxc7 Qxc7 19. c5+ Kh8 20. Nb5 Qc8 21. Nxd6 Be6 22. Qc3 Bxd6 23. Rxd6 e4 24. Ng5 Bg8 25. Rfd1 Qe8 26. Rd7 Qg6 27. h4 Rfd8 28. b5 Rxd7 29. Rxd7 Na5 30. Bh3 e3 31. Qxe3 h6 32. Nf3 Nc4 33. Qd4 Rf8 34. h5 Qh7 35. Nh4 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2017.07.26"]
[Round "2"]
[White "Mesman, Edwyn"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "2230"]
[BlackElo "2115"]
[PlyCount "109"]
[EventDate "2017.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 179 Extra"]
[Source "ChessBase"]
[SourceDate "2017.08.23"]
[SourceVersion "1"]
[SourceVersionDate "2017.08.23"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. Nf3 Nf6 4. g3 Be7 5. Bg2 0-0 6. 0-0 d6 7. b4 c6 8. a4 Qe8 9. Nbd2 Qh5 10. c5 d5 11. Nb3 Ne4 12. Bb2 Rf6 13. Nc1 g5 14. Nd3 Nd7 15. h4 h6 16. Bc1 Rf7 17. Nfe5 Nxe5 18. Nxe5 Nc3 19. Bf3 g4 20. Qc2 gxf3 21. exf3 Rg7 22. Qxc3 Bf6 23. Qe3 Kh7 24. Kg2 Bxe5 25. Qxe5 Bd7 26. Bf4 a6 27. Rae1 Rag8 28. Qd6 Bc8 29. Rb1 Rg6 30. Be5 Re8 31. Qc7+ Kg8 32. b5 cxb5 33. axb5 Qxh4 34. c6 Qe7 35. Qb6 axb5 36. c7 Qd7 37. Rxb5 Kh7 38. Qc5 Rgg8 39. Ra1 Rgf8 40. Rb6 Rg8 41. Rd6 Qe7 42. Rh1 Qf8 43. Bf4 Rg6 44. Qc1 Kg8 45. Rb6 Kh7 46. Rh2 Qf6 47. Qd2 Re7 48. Be5 Qf7 49. Rb1 Rxc7 50. Rbh1 f4 51. Bxf4 e5 52. Rxh6+ Rxh6 53. Rxh6+ Kg8 54. Bxe5 Bg4 55. Rh8# 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2017.07.25"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Beukema, Stefan"]
[Result "0-1"]
[ECO "A88"]
[WhiteElo "2115"]
[BlackElo "2400"]
[PlyCount "74"]
[EventDate "2017.07.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 179 Extra"]
[Source "ChessBase"]
[SourceDate "2017.08.23"]
[SourceVersion "1"]
[SourceVersionDate "2017.08.23"]
[SourceQuality "1"]

1. Nf3 f5 2. b3 d6 3. d4 g6 4. Bb2 Bg7 5. c4 Nf6 6. g3 0-0 7. Bg2 Na6 8. 0-0 Rb8 9. Nc3 c6 10. Qc1 b5 11. Nd2 b4 12. Na4 Qe8 13. e4 f4 14. e5 Nh5 15. Qd1 dxe5 16. dxe5 Bh6 17. Ne4 Qf7 18. Qd4 Be6 19. Qxa7 f3 20. Bh1 Ra8 21. Qb7 Qf5 22. Qxe7 Rae8 23. Qh4 Nf4 24. Rfe1 Ne2+ 25. Rxe2 fxe2 26. Re1 Rd8 27. f4 Rd1 28. Kf2 Bxf4 29. Kxe2 Qg4+ 30. Bf3 Rxe1+ 31. Kxe1 Qxf3 32. Nf6+ Rxf6 33. exf6 Qe3+ 34. Kf1 Qd3+ 35. Kf2 Be3+ 36. Kg2 Qe2+ 37. Kh1 Qf3# 0-1

[Event "Delft Prinsenstad op 10th"]
[Site "Delft"]
[Date "2017.04.16"]
[Round "6"]
[White "Hortensius, Lisa"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "C11"]
[WhiteElo "2161"]
[BlackElo "2118"]
[PlyCount "55"]
[EventDate "2017.04.14"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 177 Extra"]
[Source "ChessBase"]
[SourceDate "2017.04.27"]
[SourceVersion "1"]
[SourceVersionDate "2017.04.27"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. Nc3 Nf6 4. e5 Nfd7 5. d4 c5 6. dxc5 Bxc5 7. Bd3 Nc6 8. Bf4 a6 9. Qe2 Nb4 10. 0-0 Nxd3 11. cxd3 b5 12. Rac1 Bb7 13. Rc2 h6 14. Be3 Rc8 15. Bxc5 Rxc5 16. Rfc1 0-0 17. d4 Rc8 18. b3 Qb6 19. Nd1 Nb8 20. Nb2 Rxc2 21. Rxc2 Nc6 22. Qd2 a5 23. Rc5 Rc8 24. Qe3 Rc7 25. Nd3 b4 26. Rc1 Ba6 27. Nc5 Bb5 28. h3 1/2-1/2

[Event "Leiden Noteboom Memorial 77th"]
[Site "Leiden"]
[Date "2017.02.24"]
[Round "1"]
[White "Spoelman, Wouter"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "A10"]
[WhiteElo "2584"]
[BlackElo "2097"]
[PlyCount "100"]
[EventDate "2017.02.24"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 177 Extra"]
[Source "ChessBase"]
[SourceDate "2017.04.27"]
[SourceVersion "1"]
[SourceVersionDate "2017.04.27"]
[SourceQuality "1"]

1. c4 e6 2. Nc3 f5 3. g3 Nf6 4. Bg2 Be7 5. e3 0-0 6. Nge2 d6 7. 0-0 c6 8. b3 Qe8 9. Bb2 e5 10. f4 Na6 11. d3 Qh5 12. Qd2 Nc7 13. Nd1 Ne6 14. Nf2 exf4 15. gxf4 Qh6 16. Ng3 Nh5 17. Bf3 Nxg3 18. hxg3 Bf6 19. Kg2 Bxb2 20. Qxb2 Qf6 21. Qxf6 Rxf6 22. g4 Nc5 23. d4 fxg4 24. Bxg4 Na6 25. Kf3 Be6 26. e4 Nc7 27. f5 Re8 28. Kg3 Bc8 29. Rae1 Rf7 30. Bh5 g6 31. Ng4 gxh5 32. Nh6+ Kg7 33. Nxf7 Kxf7 34. Kf4 Rg8 35. Rg1 Rxg1 36. Rxg1 Ne8 37. c5 d5 38. e5 Ng7 39. f6 Nf5 40. Kg5 h4 41. Rh1 Nxd4 42. Kxh4 Bf5 43. Kg5 Bg6 44. Kf4 Ne6+ 45. Ke3 d4+ 46. Kd2 Nxc5 47. Rc1 Nd3 48. e6+ Kxf6 49. Rc4 c5 50. b4 b5 0-1

[Event "Dieren op"]
[Site "Dieren"]
[Date "2016.07.27"]
[Round "2"]
[White "Sagar, Shah"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "2433"]
[BlackElo "2115"]
[PlyCount "39"]
[EventDate "2016.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 173 Extra"]
[Source "ChessBase"]
[SourceDate "2016.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2016.08.29"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Ne4 8. Qc2 Nxc3 9. bxc3 Nc6 10. d5 Na5 11. dxe6 Bxe6 12. Nd4 Bxc4 13. Nxf5 Bf6 14. Rd1 Qe8 15. e4 Qh5 16. Bf4 Rae8 17. Ne3 Qf7 18. e5 Bxe5 19. Nxc4 Nxc4 20. Bd5 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2016.07.26"]
[Round "1"]
[White "Zwirs, Nico"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A85"]
[WhiteElo "2374"]
[BlackElo "2115"]
[PlyCount "89"]
[EventDate "2016.07.26"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 173 Extra"]
[Source "ChessBase"]
[SourceDate "2016.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2016.08.29"]
[SourceQuality "1"]

1. Nf3 e6 2. c4 f5 3. d4 Nf6 4. Nc3 Bb4 5. Qb3 Qe7 6. a3 Bxc3+ 7. Qxc3 b6 8. g3 Bb7 9. Bg2 d6 10. 0-0 Nbd7 11. b4 0-0 12. a4 a5 13. b5 Ne4 14. Qc2 e5 15. Bb2 Ng5 16. Nxg5 Bxg2 17. Kxg2 Qxg5 18. dxe5 Nxe5 19. c5 f4 20. cxd6 cxd6 21. Rad1 Rf6 22. Rd5 Raf8 23. Bxe5 dxe5 24. Qe4 fxg3 25. hxg3 Re8 26. Rh1 h6 27. Rh4 Rg6 28. e3 Ree6 29. Rd7 Kh7 30. Rh1 Qg4 31. Qxg4 Rxg4 32. Rh4 Reg6 33. Rxg4 Rxg4 34. f4 exf4 35. exf4 Rg6 36. Kf3 Re6 37. f5 Re1 38. Kf4 Ra1 39. Rd4 Kg8 40. Ke5 Rc1 41. Rd6 Ra1 42. Rxb6 Rxa4 43. Ra6 Kf7 44. Ra7+ Kf8 45. b6 1-0

[Event "Delft Prinsenstad op 9th"]
[Site "Delft"]
[Date "2016.03.27"]
[Round "5"]
[White "Roorda, Thijs"]
[Black "Van den Doel, Erik"]
[Result "0-1"]
[ECO "D79"]
[WhiteElo "2125"]
[BlackElo "2564"]
[PlyCount "116"]
[EventDate "2016.03.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 171 Extra"]
[Source "ChessBase"]
[SourceDate "2016.04.26"]
[SourceVersion "1"]
[SourceVersionDate "2016.04.26"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c6 3. g3 d5 4. Bg2 g6 5. 0-0 Bg7 6. d4 0-0 7. cxd5 cxd5 8. Ne5 e6 9. Nc3 Nfd7 10. Nxd7 Bxd7 11. Bf4 Nc6 12. e3 Na5 13. e4 dxe4 14. Bxe4 Bc6 15. Bxc6 Nxc6 16. d5 exd5 17. Nxd5 Nd4 18. Nc3 Re8 19. Be3 Nf5 20. Qf3 Bxc3 21. bxc3 Nxe3 22. fxe3 Qe7 23. Rf2 Rac8 24. Raf1 Rc7 25. Qf4 g5 26. Qf5 Qxe3 27. c4 h6 28. Qf6 Qe6 29. Qd4 b6 30. Rf6 Qe3+ 31. Qxe3 Rxe3 32. Rxh6 Rxc4 33. Rd6 Re7 34. Rd5 g4 35. Rf2 Ra4 36. Kg2 a6 37. Kf1 b5 38. Rc2 f6 39. Rd6 Kg7 40. Rf2 Rf7 41. Rf4 Rxa2 42. Rxg4+ Kf8 43. Rb6 Rc7 44. Rxf6+ Ke7 45. Rg7+ Kxf6 46. Rxc7 b4 47. Ke1 Ke5 48. Kd1 Kd4 49. h4 a5 50. h5 Rh2 51. g4 a4 52. Kc1 a3 53. Kb1 b3 54. Rd7+ Kc5 55. Rd1 a2+ 56. Ka1 Kb4 57. g5 Ka3 58. g6 b2# 0-1

[Event "Delft Prinsenstad op 9th"]
[Site "Delft"]
[Date "2016.03.27"]
[Round "6"]
[White "Voogt, Bob"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "C07"]
[WhiteElo "2126"]
[BlackElo "2125"]
[PlyCount "124"]
[EventDate "2016.03.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 171 Extra"]
[Source "ChessBase"]
[SourceDate "2016.04.26"]
[SourceVersion "1"]
[SourceVersionDate "2016.04.26"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 a6 4. c3 c5 5. exd5 exd5 6. Ngf3 Nc6 7. Be2 Nf6 8. 0-0 cxd4 9. Nxd4 Nxd4 10. cxd4 Bd6 11. Nf3 0-0 12. Bg5 Re8 13. Re1 Bb4 14. Rf1 Bg4 15. h3 Bh5 16. a3 Ba5 17. Rc1 Qd6 18. Bxf6 Qxf6 19. b4 Bb6 20. Re1 Re4 21. Qb3 Rae8 22. Kf1 Bxf3 23. Bxf3 Qxd4 24. Qc2 Rxe1+ 25. Rxe1 Rxe1+ 26. Kxe1 g6 27. Qd2 Qa1+ 28. Ke2 Qe5+ 29. Kf1 Bd4 30. Qe2 Qf5 31. Qd2 Qb1+ 32. Ke2 Qa1 33. Bxd5 Bc3 34. Qf4 Qe1+ 35. Kd3 Qd1+ 36. Kc4 b5+ 37. Kc5 Kh8 38. Qxf7 Qd4+ 39. Kc6 Qf6+ 40. Qxf6+ Bxf6 41. Kb6 Bb2 42. Kxa6 Bxa3 43. Kxb5 Kg7 44. Ka5 Kf6 45. b5 Ke5 46. Bg8 h6 47. b6 Kd6 48. f3 Kc6 49. Bf7 g5 50. Ka6 Bc5 51. Be8+ Kd6 52. Kb5 Be3 53. b7 Kc7 54. b8Q+ Kxb8 55. Kc6 Kc8 56. Kd6 Kd8 57. Bc6 Bf4+ 58. Ke6 h5 59. h4 gxh4 60. Kf5 Bg3 61. Kg5 Ke7 62. Kxh5 Kf6 1/2-1/2

[Event "Delft Prinsenstad op 9th"]
[Site "Delft"]
[Date "2016.03.26"]
[Round "3"]
[White "Nguyen, Kevin"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "A10"]
[WhiteElo "2069"]
[BlackElo "2125"]
[PlyCount "112"]
[EventDate "2016.03.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 171 Extra"]
[Source "ChessBase"]
[SourceDate "2016.04.26"]
[SourceVersion "1"]
[SourceVersionDate "2016.04.26"]
[SourceQuality "1"]

1. Nf3 e6 2. g3 f5 3. Bg2 Nf6 4. 0-0 Be7 5. d3 0-0 6. c4 b6 7. Nc3 Bb7 8. Rb1 c5 9. a3 Nc6 10. Bd2 Qe8 11. e3 Qh5 12. Ne2 g5 13. Bc3 Rad8 14. d4 d5 15. b4 cxb4 16. axb4 dxc4 17. b5 Na5 18. Ne5 Bd6 19. Nc6 Nxc6 20. bxc6 Ba8 21. Re1 Ne4 22. Qa4 b5 23. Qxb5 Rb8 24. Qxc4 Qf7 25. Rxb8 Bxb8 26. Ba5 Rc8 27. c7 Bxc7 28. Rc1 Nd6 29. Qb4 Rb8 30. Qc5 Bxa5 31. Bxa8 Bb4 32. Rb1 a5 33. Rxb4 axb4 34. Qxd6 Rxa8 35. Qxb4 Qc7 36. Qc3 Qb7 37. Nc1 Rc8 38. Qa1 Qb5 39. d5 Qxd5 40. Ne2 e5 41. Qa6 Ra8 42. Nc3 Qd1+ 43. Nxd1 Rxa6 44. Nc3 Kf7 45. Kg2 Ke6 46. Nb5 Rb6 47. Nc3 Rb3 48. Ne2 Rb2 49. Ng1 g4 50. h3 h5 51. hxg4 hxg4 52. Kf1 Kd5 53. Ne2 Ke4 54. Nc3+ Kf3 55. Nd1 Rb1 56. Ke1 Rxd1+ 0-1

[Event "Delft Prinsenstad op 9th"]
[Site "Delft"]
[Date "2016.03.26"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "De Jong, Migchiel"]
[Result "0-1"]
[ECO "E70"]
[WhiteElo "2125"]
[BlackElo "2336"]
[PlyCount "84"]
[EventDate "2016.03.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 171 Extra"]
[Source "ChessBase"]
[SourceDate "2016.04.26"]
[SourceVersion "1"]
[SourceVersionDate "2016.04.26"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 0-0 5. d4 c6 6. h3 d5 7. e5 Ne4 8. Bd3 Nxc3 9. bxc3 dxc4 10. Bxc4 c5 11. 0-0 cxd4 12. cxd4 Nc6 13. Rb1 Na5 14. Bd3 Be6 15. Qa4 Bd5 16. Rd1 Rc8 17. Ba3 Nc4 18. Bxc4 Rxc4 19. Qxa7 Qd7 20. Nd2 Ra4 21. Qc5 e6 22. Qd6 Qc8 23. Rbc1 Qa8 24. Rc3 Rd8 25. Qb6 Bxa2 26. Bd6 Bd5 27. Rdc1 Bh6 28. R3c2 Bc6 29. Rb1 Ra6 30. Qb2 b5 31. f3 Be3+ 32. Kh2 Bd5 33. Qc3 Bf4+ 34. g3 Bxd2 35. Qxd2 Bxf3 36. Rf1 Ra1 37. Qf2 Rxf1 38. Qxf1 f5 39. Rf2 Bd5 40. Qxb5 Qa1 41. Qf1 Qxd4 42. Qc1 Qxf2# 0-1

[Event "Leiden Noteboom Memorial 76th"]
[Site "Leiden"]
[Date "2016.02.06"]
[Round "3"]
[White "Lai, Hing Ting"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A96"]
[WhiteElo "2319"]
[BlackElo "2114"]
[PlyCount "47"]
[EventDate "2016.02.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 170 Extra"]
[Source "ChessBase"]
[SourceDate "2016.02.25"]
[SourceVersion "1"]
[SourceVersionDate "2016.02.25"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 f5 3. g3 Nf6 4. Bg2 Be7 5. 0-0 0-0 6. c4 d6 7. Nc3 a5 8. Qc2 Nc6 9. a3 e5 10. dxe5 dxe5 11. Rd1 Qe8 12. Nb5 Bd8 13. b3 Qh5 14. Bb2 e4 15. Nfd4 Ne5 16. f3 Nfg4 17. fxg4 Nxg4 18. h3 Ne3 19. Qd2 f4 20. Nc2 Nxg2 21. g4 Qxh3 22. Qd5+ Kh8 23. Qf7 Bf6 24. Qxf8# 1-0

[Event "Leiden Noteboom Memorial 76th"]
[Site "Leiden"]
[Date "2016.02.05"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Bok, Benjamin"]
[Result "0-1"]
[ECO "A35"]
[WhiteElo "2114"]
[BlackElo "2611"]
[PlyCount "66"]
[EventDate "2016.02.05"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 170 Extra"]
[Source "ChessBase"]
[SourceDate "2016.02.25"]
[SourceVersion "1"]
[SourceVersionDate "2016.02.25"]
[SourceQuality "1"]

1. Nf3 g6 2. c4 Bg7 3. Nc3 c5 4. d4 cxd4 5. Nxd4 Nc6 6. Nb3 Nf6 7. e4 0-0 8. Be2 d6 9. 0-0 Be6 10. Bf4 a5 11. Nd2 Nd7 12. Be3 Nc5 13. Na4 Nxa4 14. Qxa4 Bxb2 15. Rab1 Bg7 16. Rxb7 Nd4 17. Bd3 Bc8 18. Rbb1 Bd7 19. Qa3 Qc7 20. Nb3 Ne6 21. c5 a4 22. cxd6 Qc3 23. dxe7 Rfe8 24. Qd6 axb3 25. Rxb3 Qc6 26. Qb4 Bf6 27. Rc1 Qa4 28. Qb7 Rxe7 29. e5 Bxe5 30. Bb5 Qxa2 31. Bxd7 Rxd7 32. Qxd7 Qxb3 33. Bh6 Qb8 0-1

[Event "Dieren op"]
[Site "Dieren"]
[Date "2015.07.25"]
[Round "5"]
[White "Ypma, Peter"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "E60"]
[WhiteElo "2246"]
[BlackElo "2103"]
[PlyCount "143"]
[EventDate "2015.07.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 167 Extra"]
[Source "ChessBase"]
[SourceDate "2015.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2015.09.14"]
[SourceQuality "1"]

1. g3 Nf6 2. Bg2 g6 3. e4 d6 4. d4 Bg7 5. Ne2 c5 6. 0-0 cxd4 7. Nxd4 0-0 8. c4 Qc7 9. b3 Ng4 10. Bb2 Qc5 11. Na3 Nc6 12. Nac2 Nce5 13. h3 Nf6 14. f4 Nc6 15. Kh2 Bd7 16. Rb1 Rad8 17. Re1 Rfe8 18. Nxc6 Bxc6 19. Bd4 Qa5 20. b4 Qxa2 21. Qd3 b5 22. cxb5 Bxb5 23. Qxb5 Qxc2 24. Rbc1 Qa2 25. Re2 Qa3 26. Ra1 Qb3 27. Rb2 Qe6 28. Qd3 Rc8 29. Rxa7 Rc1 30. Bxf6 Bxf6 31. e5 dxe5 32. Bd5 Rc3 33. Qxc3 Qxd5 34. Ra5 exf4 35. Rxd5 Bxc3 36. Rb3 fxg3+ 37. Kxg3 e6 38. Rd7 Be1+ 39. Kf3 Rb8 40. b5 Ba5 41. Ke4 Kf8 42. Kd3 Ke8 43. Rd6 Ke7 44. Rc6 Bb6 45. Kc4 g5 46. Ra3 h5 47. Ra6 Bd8 48. b6 Kd7 49. Kb5 g4 50. Ra7+ Ke8 51. b7 Kd7 52. hxg4 hxg4 53. Rc2 f5 54. Ka6 Bc7 55. Ra8 g3 56. Ka7 Rxb7+ 57. Kxb7 Bd6 58. Rd2 Ke7 59. Kc6 Bb4 60. Rg2 Be1 61. Kc5 f4 62. Re2 Bf2+ 63. Rxf2 gxf2 64. Ra1 Kf6 65. Kd4 Kf5 66. Kd3 Kg4 67. Ke2 Kg3 68. Ra8 f3+ 69. Kf1 e5 70. Rg8+ Kf4 71. Kxf2 e4 72. Re8 1-0

[Event "Dieren op"]
[Site "Dieren"]
[Date "2015.07.24"]
[Round "4"]
[White "Roorda, Thijs"]
[Black "Van Foreest, Lucas"]
[Result "1/2-1/2"]
[ECO "E18"]
[WhiteElo "2103"]
[BlackElo "2294"]
[PlyCount "101"]
[EventDate "2015.07.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 167 Extra"]
[Source "ChessBase"]
[SourceDate "2015.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2015.09.14"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 b6 3. g3 Bb7 4. Bg2 e6 5. 0-0 Be7 6. d4 0-0 7. Nc3 Na6 8. Re1 d5 9. Ne5 c5 10. cxd5 exd5 11. e3 Nc7 12. b3 Ne6 13. Bb2 Rc8 14. Qd3 Re8 15. Rad1 Bd6 16. f4 cxd4 17. exd4 Nxd4 18. Nxd5 Bxd5 19. Bxd4 Bxg2 20. Kxg2 Bb4 21. Re2 Qd5+ 22. Kg1 Qe6 23. Qb5 Bd6 24. Rde1 Qf5 25. a4 h5 26. Nd7 Qxb5 27. Nxf6+ gxf6 28. axb5 Rxe2 29. Rxe2 Bc5 30. Bxc5 Rxc5 31. Re7 Rxb5 32. Rxa7 Rxb3 33. Kg2 Rb2+ 34. Kh3 Kg7 35. Rc7 Kg6 36. Rd7 b5 37. Rc7 b4 38. Rb7 Rb1 39. Kh4 Rb2 40. h3 f5 41. Rb6+ f6 42. Rb7 Rb1 43. Rb6 b3 44. Rb8 Rb2 45. Rb7 Kh6 46. Rb6 Kg6 47. Rb7 Kh6 48. Rb6 Kg6 49. Rb7 Kh6 50. Rb6 Kg6 51. Rb7 1/2-1/2

[Event "Dieren op"]
[Site "Dieren"]
[Date "2015.07.23"]
[Round "3"]
[White "Maris, Ivo"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A38"]
[WhiteElo "2262"]
[BlackElo "2103"]
[PlyCount "122"]
[EventDate "2015.07.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 167 Extra"]
[Source "ChessBase"]
[SourceDate "2015.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2015.09.14"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 c5 4. d4 cxd4 5. Nxd4 Nc6 6. g3 Bg7 7. Bg2 0-0 8. Nc2 d6 9. Rb1 Bd7 10. 0-0 Qc8 11. Re1 Bh3 12. Bh1 Rd8 13. Nd5 Nxd5 14. cxd5 Ne5 15. Be3 Bf5 16. Rc1 Nc4 17. Nd4 Nxe3 18. Qb3 Nc2 19. Nxc2 Bxc2 20. Rxc2 Qd7 21. Rec1 Rdc8 22. Be4 b6 23. Rc6 Rxc6 24. Rxc6 Qg4 25. Bf3 Qd4 26. Rc2 Bf6 27. e3 Qe5 28. Qa4 Qf5 29. Kg2 b5 30. Qb3 Qd7 31. Rc6 a6 32. Qc2 Qd8 33. h4 h5 34. b3 Kg7 35. Be2 Qa5 36. a4 bxa4 37. bxa4 Qxd5+ 38. Bf3 Qe5 39. Rb6 Qa5 40. Rxd6 Rb8 41. Rd5 Qe1 42. Rd1 Qc3 43. Qxc3 Bxc3 44. Rc1 Rb3 45. Bc6 Bb4 46. Bb7 Ba3 47. Rc7 Bd6 48. Rd7 a5 49. Bd5 Rb2 50. Bc6 Bb4 51. Rd1 Rc2 52. Bb5 Rd2 53. Rf1 Bc5 54. Kf3 Bb4 55. g4 hxg4+ 56. Kxg4 f5+ 57. Kh3 Kf6 58. Be8 Rd8 59. Bb5 Rd2 60. Be8 Rd8 61. Bb5 Rd2 1/2-1/2

[Event "Dieren op"]
[Site "Dieren"]
[Date "2015.07.21"]
[Round "1"]
[White "Maatman, Nick"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A16"]
[WhiteElo "2266"]
[BlackElo "2103"]
[PlyCount "19"]
[EventDate "2015.07.21"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 167 Extra"]
[Source "ChessBase"]
[SourceDate "2015.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2015.09.14"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. dxc3 Nd7 7. Bc4 Bg7 8. Bxf7+ Kf8 9. Ng5 Nc5 10. Qxd8# 1-0

[Event "Leiden op-A 8th"]
[Site "Leiden"]
[Date "2014.07.13"]
[Round "3"]
[White "Roorda, Thijs"]
[Black "Lupor, Andre"]
[Result "0-1"]
[ECO "B84"]
[WhiteElo "2074"]
[BlackElo "2281"]
[PlyCount "62"]
[EventDate "2014.07.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 161 Extra"]
[Source "ChessBase"]
[SourceDate "2014.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2014.08.29"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 e6 3. d4 cxd4 4. Nxd4 a6 5. Be2 Nf6 6. Nc3 Qc7 7. 0-0 d6 8. a4 Nc6 9. Nxc6 bxc6 10. Bf4 e5 11. Be3 Be7 12. h3 Be6 13. f4 exf4 14. Bxf4 0-0 15. Qd3 Nd7 16. Qg3 Ne5 17. Nd1 a5 18. Nf2 Ng6 19. Be3 Bh4 20. Qh2 Bf6 21. Nd3 Qe7 22. Rad1 Bc4 23. b3 Qxe4 24. Rf3 Ne5 25. Rg3 Bxd3 26. Bxd3 Nxd3 27. cxd3 Qb4 28. d4 Rfe8 29. Kh1 Qxb3 30. Qg1 Re4 31. Rf1 Bxd4 0-1

[Event "Leiden op-A 8th"]
[Site "Leiden"]
[Date "2014.07.11"]
[Round "1"]
[White "Das, Arghyadip"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2439"]
[BlackElo "2074"]
[PlyCount "107"]
[EventDate "2014.07.11"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 161 Extra"]
[Source "ChessBase"]
[SourceDate "2014.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2014.08.29"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 a6 4. Bd3 Nf6 5. e5 Nfd7 6. c3 c5 7. Ne2 Nc6 8. 0-0 Qb6 9. Nf3 Be7 10. a3 c4 11. Bc2 Nf8 12. Ng3 h5 13. h4 g6 14. Rb1 Qd8 15. Bg5 Bd7 16. Qd2 Nh7 17. Bh6 Bf8 18. Bxf8 Nxf8 19. Ng5 Qe7 20. Qf4 Nh7 21. Nxh5 gxh5 22. Nxh7 0-0-0 23. Nf6 Qf8 24. Rfe1 Ne7 25. Qg5 Qh6 26. g3 Ng8 27. Re3 Nxf6 28. Qxf6 Qxf6 29. exf6 Rdg8 30. Rbe1 Kc7 31. Rf3 Kd6 32. Re5 b5 33. Rf4 Rh6 34. Rg5 Rgh8 35. Rg7 Be8 36. Kh2 a5 37. Kg2 Kc6 38. Kf1 Kd6 39. Ke1 Kc6 40. Bd1 Kd6 41. Rf3 e5 42. dxe5+ Kxe5 43. Rg5+ Ke6 44. Rff5 Bc6 45. Rxh5 Rxh5 46. Rxh5 Re8 47. Kd2 Bb7 48. Rh6 Kf5 49. Bc2+ Ke5 50. Rh7 Ke6 51. g4 Kxf6 52. g5+ Ke6 53. g6 Bc6 54. g7 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.24"]
[Round "7"]
[White "Roorda, Thijs"]
[Black "Van Ketel, Raoul"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2016"]
[BlackElo "2285"]
[PlyCount "65"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 f6 9. exf6 Nxf6 10. 0-0 Bd6 11. Nf3 Qc7 12. Bg5 0-0 13. Rc1 h6 14. Bh4 Nh5 15. Nc3 Bf4 16. Rc2 Qf7 17. Re2 g5 18. Bg3 Qg7 19. Rfe1 Bxg3 20. hxg3 g4 21. Rxe6 Bxe6 22. Rxe6 Rf6 23. Rxf6 Nxf6 24. Nh4 Ne7 25. Nb5 Rd8 26. Qe1 Qf7 27. Qe3 h5 28. Nc7 Ne4 29. Bxe4 dxe4 30. Qg5+ Kh7 31. Qe5 Ng6 32. Qxh5+ Kg8 33. Nxg6 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.17"]
[Round "6"]
[White "Straver, Robert"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "B46"]
[WhiteElo "2136"]
[BlackElo "2016"]
[PlyCount "79"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 a6 6. Be3 Nf6 7. Qd2 Bb4 8. f3 d5 9. Nxc6 bxc6 10. a3 Qa5 11. Bd3 0-0 12. 0-0 Bc5 13. b4 Bxe3+ 14. Qxe3 Qc7 15. Kh1 a5 16. Qc5 Nd7 17. Qe7 Qe5 18. exd5 Qxc3 19. dxc6 Nf6 20. b5 e5 21. a4 Be6 22. Qa3 Qd4 23. Rfe1 Rfe8 24. Rad1 Qf4 25. Qc5 Bd5 26. Bf1 Qxa4 27. c4 Be6 28. b6 Rac8 29. Rd6 h6 30. b7 Rb8 31. Rxe6 fxe6 32. c7 Nd7 33. cxb8Q Nxc5 34. Qc8 Na6 35. c5 Nb8 36. Bc4 Kf8 37. Bxe6 Qd4 38. Qc7 Rxe6 39. Qxb8+ Re8 40. Qxe8+ 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.10"]
[Round "5"]
[White "Roorda, Thijs"]
[Black "Van 't Hof, Eric"]
[Result "1-0"]
[ECO "D79"]
[WhiteElo "2016"]
[BlackElo "2079"]
[PlyCount "80"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. c4 c6 5. 0-0 0-0 6. d4 d5 7. Nc3 Nbd7 8. cxd5 cxd5 9. Re1 Nb6 10. a4 Bf5 11. Ne5 Ne4 12. a5 Nd7 13. Nxe4 Bxe4 14. Bxe4 dxe4 15. Nc4 Nf6 16. b3 Nd5 17. e3 b5 18. axb6 axb6 19. Bd2 Qd7 20. Kg2 b5 21. Rxa8 Rxa8 22. Na5 f5 23. b4 Rc8 24. Qb3 e6 25. Qb2 Bf8 26. Rb1 g5 27. Nb3 Qf7 28. Nc5 Rc6 29. Ra1 Nb6 30. Bc3 Nc4 31. Qe2 g4 32. Ra8 h5 33. Rb8 Nd6 34. Qa2 Nc4 35. Rxb5 e5 36. Qa8 Rc7 37. Rb8 Re7 38. d5 f4 39. Ne6 Rxe6 40. dxe6 Qf6 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.06.03"]
[Round "4"]
[White "Van de Peut, Aart A"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "C18"]
[WhiteElo "1911"]
[BlackElo "2016"]
[PlyCount "60"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7 7. Qg4 Ne7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2 dxc3 11. f4 Nbc6 12. Nxc3 a6 13. Qd3 Bd7 14. Rb1 Rc8 15. Ne2 Nf5 16. h3 Na5 17. g4 Ba4 18. c3 Ne7 19. Rb4 Bb5 20. Qd1 Bxe2 21. Bxe2 Qxc3+ 22. Bd2 Qg3+ 23. Kf1 b5 24. a4 Nec6 25. axb5 Nxb4 26. Qa4 Nd3 27. b6+ Nc6 28. Rh2 Qxh2 29. Bxd3 Qxd2 30. Qxa6 Ne7 0-1

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.05.27"]
[Round "3"]
[White "Roorda, Thijs"]
[Black "Serdijn, Adinda"]
[Result "1-0"]
[ECO "D78"]
[WhiteElo "2016"]
[BlackElo "1989"]
[PlyCount "51"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. d4 Nf6 5. 0-0 0-0 6. c4 c6 7. Nc3 Bf5 8. Ne5 Nbd7 9. cxd5 cxd5 10. Qb3 Nb6 11. a4 a5 12. Rd1 Ne4 13. Bxe4 dxe4 14. Be3 Nd7 15. Rac1 Nxe5 16. dxe5 Qb8 17. Bd4 Bxe5 18. Nd5 Bd6 19. Rc7 e5 20. Rxb7 Qd8 21. Bb6 Qc8 22. Bc7 Bc5 23. Bxe5 Be6 24. Nf6+ Kg7 25. Ng4+ Kg8 26. Nh6# 1-0

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.05.20"]
[Round "2"]
[White "Hellenberg, Jan Amerik"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A16"]
[WhiteElo "1867"]
[BlackElo "2016"]
[PlyCount "81"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. e3 e5 6. Nge2 c6 7. 0-0 d5 8. cxd5 cxd5 9. d4 exd4 10. Nxd4 Nc6 11. Nb3 Be6 12. Nc5 Qe7 13. Nxe6 fxe6 14. Bd2 Rad8 15. Ne2 Ne4 16. Bc3 Nxc3 17. Nxc3 Ne5 18. Rc1 Qb4 19. b3 Rc8 20. Ne2 Rxc1 21. Qxc1 Nd3 22. Qc2 Ne1 23. Qb1 Nxg2 24. Kxg2 e5 25. Qd3 d4 26. exd4 exd4 27. Rd1 Kh8 28. Nf4 Qe7 29. Rd2 Qf7 30. Qe4 Re8 31. Qd5 Qxd5+ 32. Nxd5 Kg8 33. Kf3 Kf7 34. Nf4 Re5 35. Rxd4 Re7 36. Rc4 Rd7 37. Ke2 Bd4 38. f3 Bg1 39. Nd3 Kf6 40. h4 Ke7 41. Re4+ 1/2-1/2

[Event "Leiden SB-chA"]
[Site "Leiden"]
[Date "2014.05.13"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Wantola, Ivo"]
[Result "0-1"]
[ECO "B35"]
[WhiteElo "2016"]
[BlackElo "2366"]
[PlyCount "120"]
[EventDate "2014.05.13"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. Be3 Nf6 6. Nc3 Bg7 7. Bc4 0-0 8. 0-0 Nxe4 9. Nxe4 d5 10. Nxc6 bxc6 11. Bd3 dxe4 12. Bxe4 Rb8 13. Qxd8 Rxd8 14. Rad1 Ba6 15. Rxd8+ Rxd8 16. Rb1 Bxb2 17. Bxa7 Bd4 18. Bxd4 Rxd4 19. Bxc6 Rc4 20. Bd5 Rxc2 21. h3 Kg7 22. Bb3 Rc3 23. Rd1 Bc4 24. Rd7 Bxb3 25. axb3 e5 26. Rb7 h5 27. h4 Kf6 28. g3 e4 29. b4 Ke6 30. b5 f6 31. b6 Rb3 32. Rg7 Rxb6 33. Rxg6 Kf5 34. Rg8 e3 35. Re8 exf2+ 36. Kxf2 Kg4 37. Re4+ Kh3 38. Re3 Rb5 39. Kf3 Rf5+ 40. Ke2 Kg2 41. Rb3 Rf2+ 42. Ke1 Rf3 43. Rb8 Kxg3 44. Rg8+ Kxh4 45. Rg1 f5 46. Ke2 Rg3 47. Rh1+ Kg4 48. Kf2 h4 49. Ra1 h3 50. Ra8 Rg2+ 51. Kf1 Rb2 52. Kg1 f4 53. Kh1 Kg3 54. Rg8+ Kf2 55. Rf8 f3 56. Rf7 Ke2 57. Re7+ Kf1 58. Re3 f2 59. Kh2 Rb1 60. Kh1 Re1 0-1

[Event "Delft Prinsenstad op-A 7th"]
[Site "Delft"]
[Date "2014.04.19"]
[Round "2"]
[White "Haslinger, Stewart"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C06"]
[WhiteElo "2544"]
[BlackElo "2082"]
[PlyCount "48"]
[EventDate "2014.04.18"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 159 Extra"]
[Source "ChessBase"]
[SourceDate "2014.04.24"]
[SourceVersion "1"]
[SourceVersionDate "2014.04.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 a6 4. Bd3 Nf6 5. e5 Nfd7 6. Ne2 c5 7. c3 Nc6 8. 0-0 b5 9. f4 Qb6 10. Nf3 g6 11. Be3 Bb7 12. Qe1 Be7 13. Bf2 0-0-0 14. dxc5 Bxc5 15. b4 Bxf2+ 16. Rxf2 f6 17. Ned4 fxe5 18. fxe5 Kb8 19. a4 Nxd4 20. Nxd4 bxa4 21. Rxa4 Rhf8 22. Rfa2 Rf4 23. Rxa6 Re4 24. Qa1 Bxa6 1-0

[Event "Delft Prinsenstad op-A 7th"]
[Site "Delft"]
[Date "2014.04.19"]
[Round "3"]
[White "Roorda, Thijs"]
[Black "Legemaat, Gert"]
[Result "0-1"]
[ECO "C18"]
[WhiteElo "2082"]
[BlackElo "2211"]
[PlyCount "66"]
[EventDate "2014.04.18"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 159 Extra"]
[Source "ChessBase"]
[SourceDate "2014.04.24"]
[SourceVersion "1"]
[SourceVersionDate "2014.04.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qa5 7. Bd2 Qa4 8. Qb1 c4 9. Nh3 Ne7 10. Be2 Nbc6 11. 0-0 b6 12. Nf4 Bd7 13. Nh5 Rg8 14. f4 0-0-0 15. Kh1 Rdf8 16. Rf3 f6 17. Ra2 Be8 18. Ng3 Bg6 19. exf6 Rxf6 20. Re3 Kd7 21. Bg4 Bf5 22. Qd1 g6 23. Nxf5 Nxf5 24. Rh3 Rf7 25. Qe2 Re8 26. Bf3 Qb5 27. Ra1 Qb2 28. Re1 Rfe7 29. Bc1 Qxc3 30. Bxd5 Qxe1+ 31. Qxe1 exd5 32. Rxh7 Rxh7 33. Qg1 Ng3# 0-1

[Event "Delft Prinsenstad op-A 7th"]
[Site "Delft"]
[Date "2014.04.18"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Van Oosterom, Chiel"]
[Result "1-0"]
[ECO "B80"]
[WhiteElo "2082"]
[BlackElo "2392"]
[PlyCount "63"]
[EventDate "2014.04.18"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 159 Extra"]
[Source "ChessBase"]
[SourceDate "2014.04.24"]
[SourceVersion "1"]
[SourceVersionDate "2014.04.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. f3 b5 8. Qd2 Nbd7 9. g4 Nb6 10. Qf2 Nfd7 11. a4 b4 12. Nc6 Qc7 13. Nxb4 d5 14. Nd3 Bb7 15. Bg2 Nc4 16. exd5 Nxb2 17. Ne4 Nxd3+ 18. cxd3 Bb4+ 19. Bd2 Bxd2+ 20. Qxd2 exd5 21. Ng3 0-0 22. 0-0 Rac8 23. Nf5 Nc5 24. Rac1 Qd7 25. Qb4 Nxd3 26. Qd4 Qxf5 27. gxf5 Nxc1 28. Qb2 Bc6 29. Rxc1 Bxa4 30. f4 Rcd8 31. Qd4 Bb3 32. f6 1-0

[Event "Leiden Noteboom Memorial 74th"]
[Site "Leiden"]
[Date "2014.03.01"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Vistisen, Lars"]
[Result "0-1"]
[ECO "A54"]
[WhiteElo "2090"]
[BlackElo "2181"]
[PlyCount "70"]
[EventDate "2014.02.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 159 Extra"]
[Source "ChessBase"]
[SourceDate "2014.04.24"]
[SourceVersion "1"]
[SourceVersionDate "2014.04.24"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d6 3. c4 Nbd7 4. Nc3 e5 5. g3 Be7 6. Bg2 c6 7. 0-0 Qc7 8. b4 Nf8 9. Bb2 Ng6 10. Rc1 0-0 11. c5 e4 12. Ne1 d5 13. e3 b5 14. cxb6 Qxb6 15. a3 Ba6 16. Na4 Qc7 17. Nc5 Bxc5 18. Rxc5 Nd7 19. Ra5 Qb7 20. f4 Bxf1 21. Bxf1 Ne7 22. g4 f5 23. g5 Nc8 24. b5 Nd6 25. bxc6 Qxc6 26. Qb3 Nb6 27. Nc2 Ndc4 28. Ra6 Nd2 29. Bb5 Qg6 30. Qa2 Qh5 31. Ne1 Qh3 32. Kf2 Qxh2+ 33. Ng2 Rac8 34. Bc3 Rxc3 35. Qxd2 Rfc8 0-1

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.21"]
[Round "9"]
[White "Bey, Jerry"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "C01"]
[BlackElo "2088"]
[PlyCount "28"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Bd3 Nc6 5. c3 Bd6 6. Ne2 Bg4 7. f3 Bh5 8. Bf4 Bg6 9. Qd2 Nge7 10. Bxd6 Qxd6 11. Bxg6 hxg6 12. Qf4 Qxf4 13. Nxf4 0-0-0 14. Nd2 Nf5 1/2-1/2

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.20"]
[Round "8"]
[White "Roorda, Thijs"]
[Black "Wantola, Ivo"]
[Result "1/2-1/2"]
[ECO "B36"]
[WhiteElo "2088"]
[BlackElo "2374"]
[PlyCount "110"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. c4 Nf6 6. Nc3 Nxd4 7. Qxd4 d6 8. Be2 Bg7 9. 0-0 0-0 10. Qd1 Be6 11. Be3 Qa5 12. f3 Rfc8 13. Nd5 Nxd5 14. exd5 Bd7 15. Bd4 Bxd4+ 16. Qxd4 b5 17. Rfe1 bxc4 18. Bxc4 Qc5 19. Qxc5 Rxc5 20. Rxe7 Rxc4 21. Rxd7 Re8 22. Rxd6 Re2 23. Kh1 Rcc2 24. Rg1 Rxb2 25. a4 Red2 26. h3 a5 27. Rd8+ Kg7 28. d6 Rb4 29. Ra1 Rbb2 30. d7 Kf6 31. Ra8 Rxd7 32. Rxa5 Rdd2 33. Rb5 Rbc2 34. Rg1 Ra2 35. a5 Rf2 36. Rb6+ Kg5 37. Rb7 Kf6 38. Rb6+ Kg7 39. Ra6 h5 40. Ra8 Kh6 41. Ra7 f6 42. h4 g5 43. hxg5+ Kxg5 44. Rb1 h4 45. Rg7+ Kf5 46. Rb5+ Ke6 47. Rh5 Rf1+ 48. Kh2 Rxf3 49. Rxh4 Rfa3 50. Rb4 Rxa5 51. Rb6+ Ke5 52. Re7+ Kf5 53. Rf7 Kg4 54. Rg7+ Rg5 55. Rxg5+ Kxg5 1/2-1/2

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.19"]
[Round "7"]
[White "Roorda, Thijs"]
[Black "Van der Zon, Stef"]
[Result "1/2-1/2"]
[ECO "E63"]
[WhiteElo "2088"]
[BlackElo "1870"]
[PlyCount "40"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. g3 0-0 5. Bg2 d6 6. Nf3 Nc6 7. 0-0 a6 8. b3 Rb8 9. a4 Nb4 10. Ba3 c5 11. Bxb4 cxb4 12. Nb1 b5 13. Nbd2 bxc4 14. Nxc4 Ne4 15. Rc1 Nc3 16. Qd2 Be6 17. Ng5 Bxc4 18. bxc4 Nxa4 19. Ra1 Qd7 20. e3 h6 1/2-1/2

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.18"]
[Round "6"]
[White "Blankert, Willem"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "D76"]
[WhiteElo "2010"]
[BlackElo "2088"]
[PlyCount "34"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 0-0 5. Nc3 d5 6. cxd5 Nxd5 7. d4 Nb6 8. 0-0 Nc6 9. d5 Na5 10. Bf4 Nac4 11. Qc2 Nxb2 12. Rab1 N2c4 13. Nb5 Nd6 14. e4 Bd7 15. Nxc7 Rc8 16. Bxd6 exd6 17. Rfc1 Ba4 0-1

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.16"]
[Round "5"]
[White "Roorda, Thijs"]
[Black "Bottema, Timo"]
[Result "1/2-1/2"]
[ECO "B31"]
[WhiteElo "2088"]
[PlyCount "82"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 Nc6 3. Bb5 g6 4. 0-0 Bg7 5. c3 e5 6. Re1 Nge7 7. Na3 a6 8. Bf1 0-0 9. Nc2 d5 10. d3 d4 11. g3 f5 12. cxd4 cxd4 13. Na3 h6 14. exf5 gxf5 15. Nc4 Ng6 16. Qb3 Be6 17. Qxb7 Bd5 18. Bg2 e4 19. Nfd2 Nce5 20. Qb6 Nxd3 21. Rf1 Rf6 22. Qxd8+ Rxd8 23. b3 Bf8 24. Rd1 Bb4 25. Nf1 Bxc4 26. bxc4 Nge5 27. Rb1 Nxc4 28. Rxd3 exd3 29. Rxb4 Ne5 30. Bf4 Re6 31. Nd2 Ng4 32. h3 Re1+ 33. Bf1 Ne3 34. fxe3 dxe3 35. Bxe3 Rxe3 36. Kf2 Rde8 37. Nf3 R3e4 38. Rb3 Ra4 39. a3 f4 40. Bxd3 fxg3+ 41. Kxg3 Kf8 1/2-1/2

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.14"]
[Round "3"]
[White "Vreeburg, Jan"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A40"]
[WhiteElo "1922"]
[BlackElo "2088"]
[PlyCount "39"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. Nf3 Bb7 4. Nc3 f5 5. g3 Bxf3 6. exf3 Nf6 7. Bg2 d5 8. 0-0 Be7 9. Qe2 Kf7 10. Re1 Qd7 11. Bf4 Nc6 12. Rad1 Rhe8 13. Nb5 Bd8 14. Be5 Na5 15. b3 Nb7 16. Nc3 c6 17. g4 g6 18. Qd2 Qe7 19. Qh6 Qf8 20. Qxf8+ 1/2-1/2

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.13"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Halfhide, Sebastian"]
[Result "0-1"]
[ECO "A60"]
[WhiteElo "2088"]
[PlyCount "56"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 c5 4. d5 e5 5. Nc3 d6 6. e4 Be7 7. h4 0-0 8. Bh3 Bxh3 9. Nxh3 Qd7 10. Bg5 h6 11. Bxf6 Bxf6 12. Qh5 Bd8 13. 0-0-0 f6 14. f4 Ba5 15. Qf3 Na6 16. Nb5 Nc7 17. Nxc7 Bxc7 18. f5 b5 19. Qd3 Rab8 20. cxb5 Rxb5 21. g4 c4 22. Qg3 Rfb8 23. Rh2 Ra5 24. Rc2 Rxa2 25. Rxc4 Rbxb2 26. Rc6 Qc8 27. g5 Qb8 28. gxf6 Ra1# 0-1

[Event "Leiden LCT op-A 7th"]
[Site "Leiden"]
[Date "2013.07.12"]
[Round "1"]
[White "Van der Togt, Twan"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "C03"]
[WhiteElo "1880"]
[BlackElo "2088"]
[PlyCount "55"]
[EventDate "2013.07.12"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 155 Extra"]
[Source "ChessBase"]
[SourceDate "2013.08.26"]
[SourceVersion "1"]
[SourceVersionDate "2013.08.26"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 a6 4. c3 c5 5. exd5 cxd4 6. dxe6 Bxe6 7. Nb3 dxc3 8. Qxd8+ Kxd8 9. bxc3 Nd7 10. Nf3 Rc8 11. Bb2 Be7 12. Nfd4 Bf6 13. Nxe6+ fxe6 14. Nd4 Nh6 15. Nxe6+ Ke7 16. Nf4 Nb6 17. Be2 Kf7 18. 0-0 Na4 19. Rab1 b5 20. Nd5 Rhd8 21. Nxf6 gxf6 22. Bf3 Nxb2 23. Rxb2 Rxc3 24. Bb7 Rd6 25. h3 f5 26. Re1 Rc7 27. Bf3 Kf6 28. Ree2 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.07.02"]
[Round "7"]
[White "Van Briemen, Willem Jan"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "A40"]
[WhiteElo "2023"]
[BlackElo "2079"]
[PlyCount "34"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. d4 e6 2. c4 b6 3. e4 Bb7 4. Bd3 f5 5. exf5 Bxg2 6. Qh5+ g6 7. fxg6 Bg7 8. gxh7+ Kf8 9. hxg8Q+ Kxg8 10. Qg6 Bxh1 11. d5 exd5 12. Nc3 Nc6 13. Qg3 Nb4 14. Bg6 Qh4 15. Qxc7 Qxh2 16. Bf4 Qxg1+ 17. Ke2 Qxg6 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.25"]
[Round "6"]
[White "Roorda, Thijs"]
[Black "Hellenberg, Jan Amerik"]
[Result "1-0"]
[ECO "D15"]
[WhiteElo "2079"]
[BlackElo "1976"]
[PlyCount "101"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 5. c5 Bf5 6. Bf4 Nbd7 7. h3 h6 8. e3 e6 9. Bd3 Bxd3 10. Qxd3 Be7 11. b4 0-0 12. g4 Nh7 13. 0-0-0 b6 14. h4 bxc5 15. bxc5 Nhf6 16. Rdg1 e5 17. Nxe5 Nxe5 18. Bxe5 Nd7 19. Bf4 Qa5 20. g5 h5 21. g6 f5 22. Kc2 Ra7 23. Rb1 Qd8 24. Qe2 Nf6 25. Rb6 Qc8 26. Bg5 Qe8 27. Rhb1 Ng4 28. Bf4 Qxg6 29. Nxd5 Bxh4 30. f3 Qe8 31. Rb8 Bd8 32. fxg4 Qe4+ 33. Kc1 Qxd5 34. gxh5 Ba5 35. h6 Rxb8 36. Rxb8+ Kh7 37. hxg7 Qh1+ 38. Qd1 Qxd1+ 39. Kxd1 Rxg7 40. Ra8 Rg2 41. Rxa6 Rxa2 42. Bc7 Ra1+ 43. Kc2 Bc3 44. Rxc6 Be1 45. Bf4 Kg7 46. d5 Kf7 47. Rc7+ Ke8 48. d6 Bh4 49. c6 Ra5 50. Rh7 Bf6 51. d7+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.18"]
[Round "5"]
[White "Straver, Robert"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "C07"]
[WhiteElo "2157"]
[BlackElo "2079"]
[PlyCount "57"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 a6 4. Ngf3 Nf6 5. Bd3 c5 6. exd5 Nxd5 7. 0-0 Nc6 8. dxc5 Bxc5 9. Ne4 Be7 10. c3 b5 11. a4 b4 12. c4 Nf6 13. Bg5 Ra7 14. Qe2 Rd7 15. Rad1 Bb7 16. Nxf6+ gxf6 17. Be3 f5 18. Bc2 Rg8 19. Rxd7 Qxd7 20. g3 Qc7 21. Rd1 Na5 22. Nd2 Qe5 23. Qd3 Qxb2 24. Nb3 Nxb3 25. Qd7+ Kf8 26. Bh6+ Rg7 27. Qxb7 Nd4 28. Qc8+ Bd8 29. Qxd8# 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.11"]
[Round "4"]
[White "Roorda, Thijs"]
[Black "Van 't Hof, Eric"]
[Result "1/2-1/2"]
[ECO "B49"]
[WhiteElo "2079"]
[BlackElo "2152"]
[PlyCount "105"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be2 a6 7. 0-0 Nf6 8. Be3 Bb4 9. Na4 b5 10. Nxc6 Qxc6 11. Nb6 Rb8 12. e5 Bb7 13. Bf3 Ne4 14. c4 Rd8 15. Rc1 Bc5 16. Nd5 Bxe3 17. Bxe4 exd5 18. Bxd5 Qh6 19. fxe3 Bxd5 20. Qxd5 Qxe3+ 21. Kh1 0-0 22. cxb5 axb5 23. Rc3 Qb6 24. Rb3 b4 25. Rf4 Qc6 26. Rd4 Ra8 27. Qxd7 Rxa2 28. h3 Ra1+ 29. Kh2 Qc1 30. Re4 Qg1+ 31. Kg3 Rf1 32. Qd4 Qh1 33. Qxb4 h5 34. Re2 Re8 35. Rbe3 Re6 36. Qe4 Rg6+ 37. Qxg6 fxg6 38. e6 h4+ 39. Kxh4 Rf8 40. e7 Re8 41. Kg5 Kh7 42. Re4 Qc1+ 43. Kh4 Qc7 44. Kg4 Qd7+ 45. Kf3 Qf5+ 46. Kg3 Qc5 47. R4e3 Qd6+ 48. Kf2 g5 49. Kg1 Qd1+ 50. Kh2 Kg6 51. g4 Qd6+ 52. Kg2 Qd5+ 53. Kf2 1/2-1/2

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.06.04"]
[Round "3"]
[White "Heemskerk, Wim"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "E65"]
[WhiteElo "2239"]
[BlackElo "2079"]
[PlyCount "113"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. d4 c5 6. Nf3 cxd4 7. Nxd4 Nc6 8. 0-0 d6 9. Nxc6 bxc6 10. Bxc6 Rb8 11. Bg2 Qc7 12. b3 d5 13. Bf4 e5 14. Bg5 dxc4 15. Bxf6 Bxf6 16. Nd5 Qd6 17. bxc4 Bg7 18. Qa4 Qd7 19. Qxd7 Bxd7 20. Rab1 Be6 21. Ne7+ Kh8 22. Bd5 Bh3 23. Rfc1 Bh6 24. e3 f5 25. Bg2 Bxg2 26. Kxg2 f4 27. exf4 exf4 28. Rxb8 Rxb8 29. Rc2 fxg3 30. hxg3 Bf8 31. Nd5 Bc5 32. Nf6 Kg7 33. Nd7 Rc8 34. Nxc5 Rxc5 35. Kf3 Kf6 36. Ke4 Ke6 37. Kd4 Kd6 38. f4 h5 39. Re2 Ra5 40. Re5 Ra6 41. Rg5 Kc7 42. a4 Rf6 43. Ke4 Re6+ 44. Kd5 Ra6 45. c5 Rxa4 46. Rxg6 h4 47. gxh4 Rxf4 48. Rg7+ Kd8 49. Rh7 a5 50. h5 a4 51. h6 a3 52. Ra7 Rh4 53. h7 Rh5+ 54. Kc4 Rh4+ 55. Kb5 a2 56. Rxa2 Rxh7 57. Ra8+ 1-0

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.05.28"]
[Round "2"]
[White "Wagemans, Ed"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "C06"]
[BlackElo "2079"]
[PlyCount "28"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Be7 4. c3 Nf6 5. e5 Nfd7 6. Ngf3 c5 7. Bd3 Nc6 8. 0-0 g5 9. h3 h5 10. dxc5 g4 11. hxg4 hxg4 12. Nd4 Ncxe5 13. Bb5 Bxc5 14. N2b3 Qh4 0-1

[Event "Leiden SB-ch"]
[Site "Leiden"]
[Date "2013.05.21"]
[Round "1"]
[White "Roorda, Thijs"]
[Black "Postma, Jan"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2079"]
[PlyCount "69"]
[EventDate "2013.05.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4 e6 5. 0-0 Nf6 6. b3 cxd4 7. Nxd4 Nxd4 8. Qxd4 Qc7 9. Bb2 Bd7 10. c4 dxc4 11. Rc1 Bc5 12. Qh4 Be7 13. Rxc4 Bc6 14. Qg5 0-0 15. Rg4 Ne8 16. Qe3 Bf6 17. Bxf6 Nxf6 18. Rc4 Qd7 19. Bxc6 bxc6 20. Qc1 Rfd8 21. Nc3 Rac8 22. Qa3 Nd5 23. Ne4 Nb6 24. Rcc1 Nd5 25. Rc2 Qe7 26. Qc5 Rc7 27. Rac1 Qxc5 28. Rxc5 Nb4 29. a3 Na6 30. Rxc6 Rxc6 31. Rxc6 Nb8 32. Rc7 a6 33. Nc5 g6 34. Ra7 Kg7 35. Nxe6+ 1-0

[Event "Bussum op 30th"]
[Site "Bussum"]
[Date "2013.05.20"]
[Round "7"]
[White "Lombaers, Peter"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "D85"]
[WhiteElo "2228"]
[BlackElo "2079"]
[PlyCount "97"]
[EventDate "2013.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 154 Extra"]
[Source "ChessBase"]
[SourceDate "2013.06.25"]
[SourceVersion "2"]
[SourceVersionDate "2013.06.25"]
[SourceQuality "1"]

1. c4 Nf6 2. d4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 c5 8. Rb1 Nc6 9. d5 Ne5 10. Nxe5 Bxe5 11. Qd2 0-0 12. f4 Bc7 13. Be2 Ba5 14. 0-0 e6 15. f5 exf5 16. exf5 Bxf5 17. Rxb7 Qf6 18. Bb2 Rfb8 19. Rxb8+ Rxb8 20. Ba1 Bc7 21. g4 Qh4 22. d6 Rd8 23. dxc7 Rxd2 24. gxf5 Rxe2 25. c8Q+ Kg7 26. f6+ Kh6 27. Qf8+ Kh5 28. Qxc5+ g5 29. Qc7 Qg4+ 30. Qg3 Qxg3+ 31. hxg3 Rxa2 32. Rc1 Kg4 33. c4 Ra6 34. c5 Rc6 35. Kg2 Kf5 36. Kf3 h5 37. Bd4 a5 38. Rh1 g4+ 39. Ke3 Kg5 40. Ke4 Rc8 41. Rc1 Re8+ 42. Be5 h4 43. gxh4+ Kxh4 44. c6 g3 45. c7 g2 46. Rg1 Kh3 47. Kf3 a4 48. Rxg2 a3 49. Rh2# 1-0

[Event "Bussum op 30th"]
[Site "Bussum"]
[Date "2013.05.19"]
[Round "5"]
[White "Hachijan, Armen"]
[Black "Roorda, Thijs"]
[Result "0-1"]
[ECO "C18"]
[WhiteElo "2231"]
[BlackElo "2079"]
[PlyCount "92"]
[EventDate "2013.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 154 Extra"]
[Source "ChessBase"]
[SourceDate "2013.06.25"]
[SourceVersion "2"]
[SourceVersionDate "2013.06.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Ne7 5. a3 Bxc3+ 6. bxc3 c5 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2 Nbc6 11. f4 dxc3 12. Qd3 d4 13. Nxd4 Nxd4 14. Qxd4 Bd7 15. Rg1 Nf5 16. Qf2 Qc6 17. Bd3 Qd5 18. Rb1 a5 19. Rb3 Rc8 20. Rb6 Bc6 21. Rb3 Ba4 22. Rb6 Rd8 23. Kf1 Rh8 24. g3 Nd4 25. Rd6 Rxd6 26. exd6 Bb5 27. Bxb5+ Qxb5+ 28. Kg2 Qd5+ 29. Kf1 Nf3 30. d7+ Kxd7 31. Rh1 Qd1+ 32. Kg2 Nh4+ 33. Kh3 Qxh1 34. Qd4+ Ke7 35. Qc5+ Kd7 36. Qd4+ Qd5 37. Qxh8 Qg2+ 38. Kg4 Qe2+ 39. Kh3 Nf5 40. Qa8 Nd6 41. Qxa5 Qf1+ 42. Kh4 Qxc1 43. Qxc3 Qd1 44. g4 Qe2 45. Qd3 Qxh2+ 46. Kg5 f6+ 0-1

[Event "Bussum op 30th"]
[Site "Bussum"]
[Date "2013.05.19"]
[Round "4"]
[White "Roorda, Thijs"]
[Black "Drent, Sjoerd"]
[Result "1-0"]
[ECO "A84"]
[WhiteElo "2079"]
[BlackElo "2037"]
[PlyCount "113"]
[EventDate "2013.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 154 Extra"]
[Source "ChessBase"]
[SourceDate "2013.06.25"]
[SourceVersion "2"]
[SourceVersionDate "2013.06.25"]
[SourceQuality "1"]

1. Nf3 d5 2. d4 e6 3. c4 f5 4. e3 Nf6 5. b3 c6 6. Bd3 a5 7. Nbd2 Bd6 8. Bb2 0-0 9. h3 Ne4 10. Ne5 Bb4 11. Bxe4 fxe4 12. Qe2 a4 13. 0-0 a3 14. Bc1 c5 15. Nb1 Nc6 16. Nxc6 bxc6 17. Bd2 Ba6 18. Qg4 Qf6 19. dxc5 Bxc5 20. Bc3 d4 21. exd4 Bxd4 22. Bxd4 Qxd4 23. Qxe6+ Kh8 24. Nxa3 Qb2 25. Qxe4 Qxa3 26. Qxc6 Rac8 27. Qb6 Rf6 28. Qd4 Rd6 29. Qa7 Rd2 30. b4 Qa4 31. b5 Bxb5 32. Qe3 Rb2 33. cxb5 Rxb5 34. Rac1 Rf8 35. Qe6 Qa8 36. Rc6 Rg5 37. Rfc1 Rg6 38. Qe7 Rxc6 39. Rxc6 Re8 40. Qd7 Rd8 41. Qc7 h6 42. Rg6 Rg8 43. Qc6 Qf8 44. a4 Qf5 45. Rg3 Rc8 46. Qg6 Qe5 47. a5 Rc1+ 48. Kh2 Qa1 49. Qe8+ Kh7 50. Qe4+ Kh8 51. Qa8+ Kh7 52. Re3 Rc4 53. Qd5 Qa4 54. Re7 Rf4 55. Qd3+ Kg8 56. Qg6 Qd4 57. Re8+ 1-0

[Event "Bussum op 30th"]
[Site "Bussum"]
[Date "2013.05.19"]
[Round "3"]
[White "Rose, Kenneth T"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "A04"]
[WhiteElo "1996"]
[BlackElo "2079"]
[PlyCount "98"]
[EventDate "2013.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 154 Extra"]
[Source "ChessBase"]
[SourceDate "2013.06.25"]
[SourceVersion "2"]
[SourceVersionDate "2013.06.25"]
[SourceQuality "1"]

1. e4 e6 2. d3 c5 3. Nf3 Nc6 4. g3 g6 5. Bg2 Bg7 6. 0-0 Nge7 7. c3 0-0 8. Re1 d5 9. e5 b5 10. Bf4 Qb6 11. Nbd2 a5 12. Nf1 b4 13. Qd2 Ba6 14. h4 Rfb8 15. Re2 a4 16. N1h2 bxc3 17. bxc3 a3 18. Rd1 d4 19. c4 Qb2 20. Ng4 Qxd2 21. Rdxd2 Rb1+ 22. Kh2 Rab8 23. Nf6+ Kh8 24. Nd7 R8b2 25. Nxc5 Nb4 26. Nxa6 Nxa6 27. Nxd4 Nb4 28. Nb5 Rd1 29. Rxb2 axb2 30. Rxb2 Nxd3 31. Re2 Nf5 32. Rd2 Rxd2 33. Bxd2 Nxf2 34. Bf4 Ng4+ 35. Kg1 Bxe5 36. c5 Nxg3 37. Bxe5+ Nxe5 38. c6 Nf5 39. c7 Ne7 40. Nd6 Nd7 41. a4 Nc5 42. a5 Na6 43. Bb7 Nxc7 44. Nxf7+ Kg7 45. Ng5 Nf5 46. a6 Nxa6 47. Bxa6 e5 48. h5 h6 49. Ne4 gxh5 1/2-1/2

[Event "Bussum op 30th"]
[Site "Bussum"]
[Date "2013.05.18"]
[Round "1"]
[White "Reinderman, Dimitri"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A16"]
[WhiteElo "2571"]
[BlackElo "2079"]
[PlyCount "81"]
[EventDate "2013.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 154 Extra"]
[Source "ChessBase"]
[SourceDate "2013.06.25"]
[SourceVersion "2"]
[SourceVersionDate "2013.06.25"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 g6 3. Nc3 d5 4. cxd5 Nxd5 5. Qa4+ Bd7 6. Qc2 Nb6 7. d4 Bg7 8. e4 0-0 9. Be3 Bg4 10. Ne5 Be6 11. Rd1 Nc6 12. Nxc6 bxc6 13. Be2 Rb8 14. 0-0 Qc8 15. Rd2 Bd7 16. Rc1 Rd8 17. Na4 Nxa4 18. Qxa4 Qb7 19. Rc5 Be8 20. Qc2 e6 21. a3 Bf8 22. Bg5 Rd7 23. Bf6 h6 24. Rc4 Bg7 25. Bxg7 Kxg7 26. Rc5 Rd6 27. b4 Rbd8 28. Qc3 Qc8 29. f4 Kh7 30. Bf3 Qd7 31. Rc4 c5 32. bxc5 Ra6 33. Rb4 Ra4 34. d5 exd5 35. exd5 Qf5 36. Be4 Qg4 37. Rxa4 Bxa4 38. Qf6 Qd7 39. f5 g5 40. h4 Re8 41. Rd4 1-0

[Event "Bussum op 30th"]
[Site "Bussum"]
[Date "2013.05.18"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Verwoert, Jef"]
[Result "1/2-1/2"]
[ECO "B34"]
[WhiteElo "2079"]
[BlackElo "2016"]
[PlyCount "65"]
[EventDate "2013.05.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "CBM 154 Extra"]
[Source "ChessBase"]
[SourceDate "2013.06.25"]
[SourceVersion "2"]
[SourceVersionDate "2013.06.25"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 g6 3. d4 cxd4 4. Nxd4 Nc6 5. Nxc6 bxc6 6. Nc3 Bg7 7. Bc4 d6 8. g4 Nf6 9. g5 Nxe4 10. Nxe4 d5 11. Bd3 dxe4 12. Bxe4 Qb6 13. c3 0-0 14. Qb3 Qa6 15. h4 Be6 16. Qc2 Bd5 17. Rh3 Qc4 18. Re3 f5 19. Bxd5+ cxd5 20. Qe2 Qxe2+ 21. Rxe2 e5 22. f4 Rfe8 23. Bd2 d4 24. fxe5 Bxe5 25. cxd4 Bxd4 26. Bc3 Bxc3+ 27. bxc3 Rac8 28. Rb1 Rxe2+ 29. Kxe2 Rxc3 30. Rb8+ Kg7 31. Rb7+ Kg8 32. Rb8+ Kg7 33. Rb7+ 1/2-1/2

[Event "Delft Prinsenstad op-A 6th"]
[Site "Delft"]
[Date "2013.03.29"]
[Round "1"]
[White "L'Ami, Alina"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "E11"]
[WhiteElo "2381"]
[BlackElo "2051"]
[PlyCount "47"]
[EventDate "2013.03.29"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 e6 2. c4 Bb4+ 3. Bd2 a5 4. Nf3 Nf6 5. Nc3 0-0 6. Qc2 d6 7. a3 Bxc3 8. Bxc3 Qe7 9. e3 b6 10. Bd3 Nbd7 11. 0-0 Bb7 12. Nd2 h6 13. Rfe1 c5 14. b4 axb4 15. axb4 d5 16. dxc5 bxc5 17. Rab1 Rfb8 18. Rec1 dxc4 19. Bxc4 Nd5 20. Bxd5 Bxd5 21. b5 Ra2 22. Qd3 Nb6 23. e4 c4 24. Qg3 1-0

[Event "Leiden Noteboom Memorial-A 73rd"]
[Site "Leiden"]
[Date "2013.02.09"]
[Round "2"]
[White "Roorda, Thijs"]
[Black "Ootes, Lars"]
[Result "0-1"]
[ECO "B09"]
[WhiteElo "2085"]
[BlackElo "2348"]
[PlyCount "102"]
[EventDate "2013.02.08"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "NED"]
[SourceTitle "CBM 152 Extra"]
[Source "ChessBase"]
[SourceDate "2013.02.25"]
[SourceVersion "1"]
[SourceVersionDate "2013.02.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 0-0 6. Bd3 Nc6 7. h3 e5 8. d5 Nb4 9. fxe5 Nxd3+ 10. Qxd3 dxe5 11. Bg5 Qd6 12. Nd2 Ne8 13. Nc4 Qd7 14. 0-0-0 b6 15. g4 a5 16. Qg3 b5 17. Nd2 b4 18. Ne2 Nd6 19. c4 bxc3 20. Nxc3 a4 21. Rh2 Rb8 22. Qd3 Ra8 23. Rg1 Ba6 24. Qe3 Rfc8 25. Kb1 Rab8 26. Rd1 Rb6 27. Ka1 Rcb8 28. Rb1 Rb4 29. Nf3 Nc4 30. Qc1 Na5 31. b3 axb3 32. Qa3 Nc4 33. Qxa6 b2+ 34. Rhxb2 Nxb2 35. Bc1 R4b6 36. Rxb2 Qd6 37. Qa7 Rxb2 38. Bxb2 Qb4 39. Qa3 Qc4 40. Nd2 Qd4 41. Ncb1 Qg1 42. Qc3 Qa7 43. Nc4 Qa4 44. Ncd2 Rb7 45. Qa3 Qe8 46. Nc4 Bf8 47. Qa6 Qb8 48. Nbd2 Ra7 49. Qf6 Bg7 50. Qc6 h6 51. Nf3 Qb3 0-1

[Event "Vlissingen HZ op 16th"]
[Site "Vlissingen"]
[Date "2012.08.11"]
[Round "9"]
[White "Colijn, Stefan"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2220"]
[BlackElo "2061"]
[PlyCount "71"]
[EventDate "2012.08.04"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d5 3. Bf4 c5 4. c3 e6 5. e3 Nc6 6. Nbd2 Be7 7. a3 0-0 8. b4 cxd4 9. cxd4 Ne4 10. Nxe4 dxe4 11. Nd2 f5 12. h4 Bf6 13. Nc4 Re8 14. Qb3 Kh8 15. Rd1 Qe7 16. Bd6 Qf7 17. Bg3 Rd8 18. Be2 Qg8 19. b5 Ne7 20. h5 Nd5 21. Ne5 h6 22. 0-0 Bd7 23. Rc1 Be8 24. Rc4 Bg5 25. a4 Kh7 26. Rfc1 Qf8 27. Qc2 Qa3 28. Kh2 a6 29. Rb1 axb5 30. axb5 Qa5 31. b6 Ba4 32. Qc1 Nxb6 33. Rc5 Qa7 34. Rc7 Rxd4 35. Qc5 Nd5 36. Rbxb7 1-0

[Event "Vlissingen HZ op 16th"]
[Site "Vlissingen"]
[Date "2012.08.10"]
[Round "8"]
[White "Roorda, Thijs"]
[Black "Van den Berg, Ad"]
[Result "1/2-1/2"]
[ECO "A44"]
[WhiteElo "2061"]
[BlackElo "2225"]
[PlyCount "17"]
[EventDate "2012.08.04"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. d4 c5 2. d5 e5 3. e4 Nf6 4. Nc3 a6 5. a4 Bd6 6. Nf3 0-0 7. Be2 Bc7 8. Bg5 d6 9. 0-0 1/2-1/2

[Event "Vlissingen HZ op 16th"]
[Site "Vlissingen"]
[Date "2012.08.09"]
[Round "7"]
[White "Tiggelman, Rene"]
[Black "Roorda, Thijs"]
[Result "1/2-1/2"]
[ECO "D23"]
[WhiteElo "2238"]
[BlackElo "2061"]
[PlyCount "72"]
[EventDate "2012.08.04"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c6 3. d4 d5 4. Qc2 dxc4 5. Qxc4 Bf5 6. g3 e6 7. Bg2 Nbd7 8. 0-0 Be7 9. Nc3 0-0 10. Qb3 Qb6 11. Re1 Ne4 12. Nh4 Bxh4 13. gxh4 Ndf6 14. Qxb6 axb6 15. f3 Nxc3 16. bxc3 Bc2 17. Bb2 Nd5 18. Rec1 Ne3 19. Kf2 Nxg2 20. Kxg2 Bg6 21. c4 Ra5 22. Kf2 Rfa8 23. a3 h6 24. e4 b5 25. c5 Ra4 26. Ke3 f6 27. Rg1 Kf7 28. Rg2 Bh5 29. Rgg1 R8a6 30. f4 g6 31. f5 gxf5 32. exf5 exf5 33. Kf4 b4 34. Rg3 bxa3 35. Raxa3 Rxa3 36. Rxa3 Rxa3 1/2-1/2

[Event "Vlissingen HZ op 16th"]
[Site "Vlissingen"]
[Date "2012.08.08"]
[Round "6"]
[White "Roorda, Thijs"]
[Black "Mesman, Edwyn"]
[Result "1-0"]
[ECO "E91"]
[WhiteElo "2061"]
[PlyCount "107"]
[EventDate "2012.08.04"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. d4 d6 2. Nf3 Nf6 3. c4 g6 4. Nc3 Bg7 5. e4 0-0 6. Be2 Nbd7 7. 0-0 Re8 8. e5 dxe5 9. dxe5 Ng4 10. e6 Nde5 11. exf7+ Nxf7 12. Qb3 Qd6 13. h3 Nf6 14. Be3 e5 15. Ng5 Qe7 16. c5 Be6 17. Nxe6 Qxe6 18. Bc4 Qe7 19. Bg5 c6 20. Ne4 Kf8 21. Bxf7 Qxf7 22. Qxf7+ Kxf7 23. Nd6+ Ke6 24. f4 Rf8 25. fxe5 Nd7 26. Nxb7 Rxf1+ 27. Rxf1 Bxe5 28. Nd8+ Kd5 29. Rd1+ Bd4+ 30. Be3 Rxd8 31. Rxd4+ Ke6 32. Rd6+ Kf7 33. Bg5 Rb8 34. Rxd7+ Ke6 35. Rd6+ Kf5 36. Bf6 Rc8 37. Kf2 h5 38. Kf3 g5 39. g4+ hxg4+ 40. hxg4+ Kg6 41. Be7+ Kf7 42. Bxg5 Rb8 43. b3 Rc8 44. Kf4 Kg7 45. Kf5 Kf7 46. Bf6 Rc7 47. g5 Rc8 48. g6+ Kg8 49. Kg5 a5 50. Kh6 Rf8 51. Be7 a4 52. Bxf8 axb3 53. Rd8 bxa2 54. Bd6# 1-0

[Event "Vlissingen HZ op 16th"]
[Site "Vlissingen"]
[Date "2012.08.06"]
[Round "4"]
[White "Roorda, Thijs"]
[Black "Ris, Robert"]
[Result "0-1"]
[ECO "A56"]
[WhiteElo "2061"]
[BlackElo "2415"]
[PlyCount "60"]
[EventDate "2012.08.04"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 Be7 6. Nge2 a6 7. a4 Nbd7 8. f3 Nh5 9. g3 g6 10. Qc2 0-0 11. Bh6 Ng7 12. h4 Nf6 13. Qd2 Kh8 14. 0-0-0 Ng8 15. Be3 Bd7 16. g4 b5 17. g5 b4 18. Nb1 Bxa4 19. Ng3 Bxd1 20. Kxd1 Nh5 21. Nxh5 gxh5 22. Qe2 a5 23. f4 a4 24. Qxh5 a3 25. Bh3 a2 26. Kc1 a1Q 27. Bf5 h6 28. g6 fxg6 29. Qxg6 Rxf5 30. Rg1 Bf6 0-1

[Event "Vlissingen HZ op 16th"]
[Site "Vlissingen"]
[Date "2012.08.05"]
[Round "3"]
[White "Bosboom, Manuel"]
[Black "Roorda, Thijs"]
[Result "1-0"]
[ECO "A48"]
[WhiteElo "2383"]
[BlackElo "2061"]
[PlyCount "53"]
[EventDate "2012.08.04"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 c5 5. Nbd2 cxd4 6. exd4 b6 7. c3 Bb7 8. Bd3 d6 9. Qc2 Nbd7 10. 0-0 Rc8 11. Rfe1 0-0 12. Bg3 Re8 13. a4 Nh5 14. a5 Nxg3 15. hxg3 d5 16. axb6 e5 17. bxa7 exd4 18. Rxe8+ Qxe8 19. Bb5 dxc3 20. bxc3 Qd8 21. Ra3 Nc5 22. Qa2 Ne4 23. Nxe4 dxe4 24. Nh2 Bxc3 25. Ba6 Ba5 26. a8Q Bxa6 27. Qxa6 1-0

