[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.02.21"]
[Round "5"]
[White "Ada, Onur"]
[Black "Oei, Ik"]
[Result "0-1"]
[ECO "B23"]
[WhiteElo "1566"]
[BlackElo "2003"]
[PlyCount "80"]
[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. e4 c5 2. Nc3 Nc6 3. f4 g6 4. Nf3 Bg7 5. Bc4 d6 6. h3 e6 7. Bb5 Nge7 8. d3 0-0 9. Bxc6 Nxc6 10. 0-0 Rb8 11. a3 b5 12. Bd2 a5 13. Rb1 b4 14. axb4 axb4 15. Ne2 Qb6 16. Be3 Nd4 17. Nexd4 cxd4 18. Bd2 Bd7 19. Kh1 Rfc8 20. e5 Bc6 21. c3 Bxf3 22. Qxf3 bxc3 23. bxc3 Qxb1 24. Rxb1 Rxb1+ 25. Kh2 dxc3 26. Bxc3 Rxc3 27. Qa8+ Bf8 28. d4 d5 29. Qa2 Rb4 30. f5 gxf5 31. Qd2 Rc8 32. h4 h6 33. Qf2 Rcc4 34. Qg3+ Kh7 35. Qf3 Rxd4 36. g3 Rd2+ 37. Kh3 Rbb2 38. Qh1 Rh2+ 39. Qxh2 Rxh2+ 40. Kxh2 Kg6 0-1

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.01.24"]
[Round "4"]
[White "Ada, Onur"]
[Black "De Mooij, Marco"]
[Result "1/2-1/2"]
[ECO "B23"]
[WhiteElo "1566"]
[BlackElo "1816"]
[PlyCount "104"]
[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. e4 c5 2. Nc3 Nc6 3. f4 e6 4. Nf3 Nge7 5. Bb5 Qb6 6. Bxc6 Qxc6 7. 0-0 d5 8. d3 b6 9. Ne5 Qd6 10. Nb5 Qd8 11. Qh5 g6 12. Qh4 Bg7 13. Ng4 Nc6 14. Qxd8+ Kxd8 15. e5 h5 16. Nf6 Ba6 17. a4 Bxb5 18. axb5 Nb4 19. c4 Bxf6 20. exf6 Nxd3 21. Rd1 Nxc1 22. Raxc1 d4 23. b4 Kc7 24. bxc5 bxc5 25. Ra1 a6 26. bxa6 Rhb8 27. Ra5 Kd6 28. Rb5 Rxb5 29. cxb5 Kc7 30. Kf1 Kb6 31. Rb1 c4 32. Ke2 Rc8 33. Kd2 c3+ 34. Kc2 Ka7 35. Kd3 Rd8 36. g3 Kb6 37. Ra1 Kxb5 38. a7 Ra8 39. Kxd4 c2 40. Rc1 Rxa7 41. Rxc2 Rd7+ 42. Ke4 Kb6 43. h3 Rc7 44. Rxc7 Kxc7 45. Ke5 Kc6 46. Ke4 Kd6 47. Kd4 Kc6 48. g4 hxg4 49. hxg4 Kd6 50. g5 Kc6 51. Ke4 Kc5 52. Ke5 Kc6 1/2-1/2

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.12.20"]
[Round "3"]
[White "Rosendaal, Frits"]
[Black "Ada, Onur"]
[Result "0-1"]
[ECO "B34"]
[BlackElo "1566"]
[PlyCount "84"]
[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. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Bg7 6. Nxc6 bxc6 7. Bc4 e6 8. 0-0 Ne7 9. Bg5 f6 10. Bf4 d5 11. exd5 cxd5 12. Bb3 0-0 13. Re1 Kh8 14. Qd2 Nf5 15. Rad1 d4 16. Ne4 e5 17. Bg3 Qb6 18. c3 Bh6 19. Qc2 Ba6 20. Bd5 Rac8 21. Qb3 Qxb3 22. Bxb3 Bc4 23. Bxc4 Rxc4 24. b3 Rc6 25. c4 Ra6 26. Ra1 Nd6 27. Nxd6 Rxd6 28. c5 Rc6 29. b4 Bd2 30. Re2 Bxb4 31. Rb1 Bxc5 32. Kf1 Bb6 33. Rd1 Rfc8 34. f3 Rc2 35. Rxc2 Rxc2 36. a4 Ra2 37. Rc1 Rxa4 38. Rc6 Kg7 39. Bh4 g5 40. Bg3 d3 41. Rd6 Bd4 42. Ke1 Bc3+ 0-1

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.29"]
[Round "2"]
[White "Ada, Onur"]
[Black "Hoogeveen, Luuk"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "1566"]
[BlackElo "1592"]
[PlyCount "99"]
[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. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. h3 0-0 6. Be3 c6 7. Qd2 Nbd7 8. Bh6 e5 9. Bxg7 Kxg7 10. dxe5 dxe5 11. 0-0-0 Qc7 12. Qe3 b5 13. g4 b4 14. Ne2 Qb6 15. Ng3 Qxe3+ 16. fxe3 Nc5 17. Nxe5 Nfxe4 18. Nxe4 Nxe4 19. Rd4 Ng3 20. Rg1 Nxf1 21. Rxf1 c5 22. Rd5 c4 23. Nxc4 Be6 24. Rd4 a5 25. b3 Rfd8 26. Rxd8 Rxd8 27. Nxa5 Ra8 28. Nc6 Rxa2 29. Kb1 Ra8 30. Nxb4 Re8 31. Re1 f5 32. g5 Kf7 33. Nd3 Bd5 34. Nf4 Be4 35. Rd1 Ke7 36. Nd5+ Bxd5 37. Rxd5 Ke6 38. c4 Rb8 39. Kb2 Rb7 40. Kc3 Rf7 41. Rd4 Ke5 42. b4 Ra7 43. Kb2 h6 44. h4 hxg5 45. hxg5 Rh7 46. Kc3 Rh3 47. Kd3 Rg3 48. b5 Rxg5 49. b6 f4 50. exf4+ 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.08"]
[Round "1"]
[White "Peper, Jeroen"]
[Black "Ada, Onur"]
[Result "1-0"]
[ECO "E11"]
[BlackElo "1566"]
[PlyCount "43"]
[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. c4 e6 3. Nf3 Bb4+ 4. Nbd2 c6 5. a3 Qa5 6. Qc2 d5 7. e3 Nbd7 8. Bd3 Bd6 9. b4 Bxb4 10. 0-0 Bd6 11. e4 dxe4 12. Nxe4 Nxe4 13. Bxe4 Qh5 14. a4 Nf6 15. Ba3 Bc7 16. Rab1 g5 17. Ne5 Ng4 18. h3 Nxe5 19. dxe5 Bxe5 20. Bxc6+ bxc6 21. Qe4 Bd7 22. Qxe5 1-0

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.05.24"]
[Round "8"]
[White "Agaian, Jura"]
[Black "Ada, Onur"]
[Result "0-1"]
[ECO "B27"]
[WhiteElo "1755"]
[BlackElo "1575"]
[PlyCount "60"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. Bc4 e6 4. Nc3 Bg7 5. d4 cxd4 6. Nxd4 a6 7. 0-0 Ne7 8. Re1 Nbc6 9. Be3 0-0 10. Qd2 d5 11. Nxc6 bxc6 12. Rad1 Bb7 13. Bf1 e5 14. exd5 cxd5 15. Bc5 d4 16. Qg5 f6 17. Qg4 f5 18. Qh4 Nd5 19. Qxd8 Rfxd8 20. Nxd5 Bxd5 21. c4 Bf7 22. b3 Rab8 23. f3 Rd7 24. Bd3 Re8 25. Bb4 Bf8 26. c5 Bd5 27. Bxa6 Ra7 28. Bb5 Rb8 29. a4 Bxb3 30. Rxe5 Bxd1 0-1

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2019.02.15"]
[Round "5"]
[White "Ada, Onur"]
[Black "Tolenaar, Jan"]
[Result "0-1"]
[ECO "B17"]
[WhiteElo "1575"]
[BlackElo "2048"]
[PlyCount "68"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Bf4 Ngf6 6. Qe2 Nxe4 7. Qxe4 Nf6 8. Qd3 Qa5+ 9. Bd2 Qc7 10. 0-0-0 Bg4 11. Be2 e6 12. Bxg4 Nxg4 13. Qe2 Nf6 14. Nf3 Be7 15. Ne5 0-0 16. h4 c5 17. Bf4 Qa5 18. Kb1 Rac8 19. Bg5 Rfd8 20. Bxf6 Bxf6 21. Qh5 Qc7 22. Ng4 Bxd4 23. c3 Rd5 24. Nh6+ gxh6 25. Qxh6 Bg7 26. Qe3 Rxd1+ 27. Rxd1 Rd8 28. Re1 Qd6 29. Kc2 e5 30. h5 Bh6 31. Qg3+ Kf8 32. Qxe5 Qd3+ 33. Kb3 Qb5+ 34. Kc2 Rd2+ 0-1

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2018.12.07"]
[Round "3"]
[White "Huizer, Olivier"]
[Black "Ada, Onur"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "1818"]
[BlackElo "1575"]
[PlyCount "83"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 g6 3. f4 Bg7 4. Nf3 Nc6 5. Bb5 Nd4 6. 0-0 Nxb5 7. Nxb5 Qb6 8. c4 a6 9. Nc3 e6 10. b3 Ne7 11. Ba3 Qa5 12. Na4 b5 13. Bb2 f6 14. Nxc5 bxc4 15. Na4 Bb7 16. e5 0-0 17. bxc4 Bc6 18. exf6 Bxa4 19. fxg7 Bxd1 20. gxf8Q+ Rxf8 21. Rfxd1 Rxf4 22. Bd4 Nf5 23. Bc3 Qc5+ 24. Kh1 Rxc4 25. Rab1 Qa7 26. Rb3 Rg4 27. Rdb1 Qf2 28. Rb8+ Kf7 29. Ne5+ Ke7 30. Nxg4 Qf4 31. Ne5 Qe4 32. R8b7 Kf6 33. Nxd7+ Kg5 34. Bf6+ Kh5 35. Nc5 Qc6 36. Rxh7+ Nh6 37. d4 g5 38. Be5 Kg6 39. Rg7+ Kf5 40. Rf1+ Kg4 41. Bf6 Qb5 42. Rxg5+ 1-0

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2018.11.09"]
[Round "2"]
[White "Ada, Onur"]
[Black "Brunner, Otto"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "1575"]
[BlackElo "1214"]
[PlyCount "43"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 a6 3. f4 d6 4. Nf3 Nc6 5. g3 Nf6 6. Bg2 Bg4 7. h3 Bxf3 8. Bxf3 e5 9. d3 h6 10. 0-0 exf4 11. Bxf4 g5 12. Bd2 Qc7 13. Bh5 Nxh5 14. Qxh5 Rh7 15. Nd5 Qd8 16. Nf6+ Qxf6 17. Rxf6 0-0-0 18. Bxg5 Be7 19. Rxh6 Rg7 20. Bf4 Nd4 21. c3 Ne2+ 22. Qxe2 1-0

[Event "Leiden SB-ch 1819"]
[Site "Leiden"]
[Date "2018.10.19"]
[Round "1"]
[White "Hordijk, Frank"]
[Black "Ada, Onur"]
[Result "1-0"]
[ECO "E42"]
[WhiteElo "1544"]
[BlackElo "1575"]
[PlyCount "87"]
[EventDate "2018.10.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 0-0 5. Nge2 c5 6. a3 cxd4 7. exd4 Bxc3+ 8. Nxc3 d5 9. Bf4 a6 10. c5 Ne8 11. Bd3 Nc6 12. Bc2 Qf6 13. Qd3 Qg6 14. Qxg6 fxg6 15. Be3 Nc7 16. 0-0-0 Bd7 17. h4 Na5 18. g3 Nc4 19. Bf4 Rac8 20. a4 Na8 21. b3 Na5 22. Rh2 b6 23. Bd6 Rf6 24. f4 bxc5 25. dxc5 Nb7 26. Be5 Rf7 27. b4 a5 28. b5 Nxc5 29. h5 gxh5 30. Rxh5 g6 31. Bxg6 Rg7 32. Bxg7 Kxg7 33. Bc2 h6 34. Rdh1 Rh8 35. f5 exf5 36. Bxf5 Bxf5 37. Rxf5 Nb6 38. Nxd5 Nbxa4 39. Rh4 Rc8 40. Rg4+ Kh8 41. Kb1 Nd3 42. Rxa4 Rc1+ 43. Ka2 Rc2+ 44. Kb3 1-0

