[Event "Cucuta Unicentro Cup"]
[Site "Cucuta"]
[Date "2021.09.18"]
[Round "3"]
[White "Contreras Lizcano, David Steven"]
[Black "Sierra Contreras, Alden Ronaldo"]
[Result "0-1"]
[ECO "E11"]
[BlackElo "1686"]
[PlyCount "38"]
[EventDate "2021.09.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Be7 5. Bg2 0-0 6. Nf3 d5 7. Nc3 dxc4 8. Qa4 a6 9. Qxc4 b5 10. Qd3 Bb7 11. a3 c5 12. Be3 b4 13. axb4 cxb4 14. Na4 Be4 15. Qc4 Nbd7 16. 0-0 Qc8 17. Qb3 Bc2 18. Rfc1 Bxb3 19. Rxc8 Raxc8 0-1

[Event "Cucuta Unicentro Cup"]
[Site "Cucuta"]
[Date "2021.09.18"]
[Round "1"]
[White "Lizarazo, Mario"]
[Black "Sierra Contreras, Alden Ronaldo"]
[Result "1-0"]
[ECO "B12"]
[BlackElo "1686"]
[PlyCount "37"]
[EventDate "2021.09.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c6 2. Nf3 d5 3. e5 c5 4. d4 Nc6 5. c3 Bg4 6. Be2 e6 7. Bf4 Qb6 8. Be3 Bxf3 9. Bxf3 cxd4 10. cxd4 Qxb2 11. Nd2 Nxd4 12. 0-0 Nxf3+ 13. Nxf3 Qa3 14. Nd4 a6 15. Rb1 b5 16. Rb3 Qa4 17. Qc2 b4 18. Rc1 Ne7 19. Qd2 1-0

[Event "Cucuta Unicentro Cup"]
[Site "Cucuta"]
[Date "2021.09.18"]
[Round "6"]
[White "Sierra Contreras, Alden Ronaldo"]
[Black "Morales Perez, Ghisell Gabriela"]
[Result "0-1"]
[ECO "D02"]
[WhiteElo "1686"]
[BlackElo "1326"]
[PlyCount "40"]
[EventDate "2021.09.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 d5 3. d4 cxd4 4. Nxd4 g6 5. Bg2 Nf6 6. 0-0 e5 7. Nf3 Nc6 8. c4 d4 9. Qa4 Bd7 10. Qb3 a5 11. e3 dxe3 12. Qxe3 Ng4 13. Qe4 Bf5 14. Qd5 Bg7 15. h3 Nf6 16. Qc5 Ne4 17. Qa3 Qd6 18. Qxd6 Nxd6 19. c5 Nb5 20. a4 Nc7 0-1

[Event "Cucuta Unicentro Cup"]
[Site "Cucuta"]
[Date "2021.09.18"]
[Round "4"]
[White "Sierra Contreras, Alden Ronaldo"]
[Black "Pabon Vanegas, Eduardo"]
[Result "1-0"]
[ECO "E06"]
[WhiteElo "1686"]
[BlackElo "1320"]
[PlyCount "72"]
[EventDate "2021.09.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 Nc6 3. Bg2 Nf6 4. 0-0 e6 5. c4 Be7 6. Nc3 d5 7. d4 dxc4 8. Ne5 cxd4 9. Nxc6 bxc6 10. Bxc6+ Bd7 11. Bxa8 Qxa8 12. Qxd4 0-0 13. e4 Rd8 14. f3 Rc8 15. Qf2 Bc6 16. Be3 Nd7 17. Rad1 Ne5 18. Qe2 f5 19. Bd4 fxe4 20. Bxe5 exf3 21. Qe3 Bf6 22. Bxf6 gxf6 23. Qxe6+ Kg7 24. Rd6 Qb7 25. Qxf6+ Kg8 26. Rfd1 Rf8 27. Qe6+ Kh8 28. R1d2 f2+ 29. Rxf2 Qb6 30. Qe5+ Kg8 31. Rdf6 Re8 32. Qxe8+ Bxe8 33. Rxb6 axb6 34. Nd5 b5 35. Nf6+ Kf7 36. Nxe8+ Ke7 1-0

[Event "Uni De Paula Santander op 3rd"]
[Site "Ocana"]
[Date "2017.10.01"]
[Round "6"]
[White "Lizarazo Epalza, Mario"]
[Black "Sierra Contreras, Alden Ronaldo"]
[Result "0-1"]
[ECO "C50"]
[WhiteElo "1612"]
[BlackElo "1594"]
[PlyCount "68"]
[EventDate "2017.09.29"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. 0-0 Nf6 5. Nc3 0-0 6. d3 h6 7. Na4 Bb6 8. Nxb6 axb6 9. c3 d6 10. h3 Na5 11. Be3 Nxc4 12. dxc4 Nxe4 13. Nh2 Be6 14. b3 f5 15. Qc2 Qe8 16. f3 Ng3 17. Rf2 f4 18. Bc1 Bf5 19. Qd1 Kh8 20. a4 Qg6 21. Raa2 Rad8 22. a5 bxa5 23. Rxa5 Ra8 24. Ra3 Rxa3 25. Bxa3 Ra8 26. Bb2 Qe8 27. b4 Ra2 28. c5 Qa4 29. Qc1 Qb5 30. c4 Qxb4 31. cxd6 cxd6 32. Rd2 Qc5+ 33. Bd4 exd4 34. Ng4 Rxd2 0-1

[Event "Uni De Paula Santander op 3rd"]
[Site "Ocana"]
[Date "2017.09.30"]
[Round "4"]
[White "Florez Hernandez, Stefany Juliet"]
[Black "Sierra Contreras, Alden Ronaldo"]
[Result "0-1"]
[ECO "D00"]
[WhiteElo "1565"]
[BlackElo "1594"]
[PlyCount "86"]
[EventDate "2017.09.29"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 Nf6 2. e3 d5 3. Nd2 c5 4. c3 Nc6 5. Bd3 e5 6. Bb5 Bd6 7. dxe5 Bxe5 8. Ngf3 Bc7 9. 0-0 0-0 10. b3 Bg4 11. Qc2 Qd6 12. h3 Bh5 13. Bd3 Ne5 14. Nxe5 Qxe5 15. f4 Qxe3+ 16. Rf2 Bd1 17. Bxh7+ Nxh7 18. Qxd1 Qxc3 19. Rb1 Ba5 20. Bb2 Qe3 21. Qg4 d4 22. Nc4 Qe4 23. Rff1 Nf6 24. Qg5 Bc7 25. Rbe1 Qc6 26. Ne5 Bxe5 27. fxe5 Nd5 28. Re4 Ne3 29. Rff4 Qg6 30. Qxg6 fxg6 31. e6 Rxf4 32. Rxf4 Re8 33. Re4 Rf8 34. e7 Re8 35. a4 Nf5 36. Kf2 Rxe7 37. Rxe7 Nxe7 38. Ke2 Kf7 39. Kd3 Ke6 40. Kc4 b6 41. b4 Kd6 42. a5 Nf5 43. bxc5+ bxc5 0-1

[Event "Santander North Region-ch"]
[Site "Cucuta"]
[Date "2017.05.24"]
[Round "5.9"]
[White "Diaz Quinones, Andres Felipe"]
[Black "Sierra Contreras, Alden Ronaldo"]
[Result "0-1"]
[ECO "C47"]
[PlyCount "42"]
[EventDate "2017.05.24"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nxc6 bxc6 6. Nc3 Nf6 7. Bg5 h6 8. Bh4 g5 9. Bg3 d6 10. Bc4 Be6 11. Bxe6 fxe6 12. e5 dxe5 13. Qxd8+ Rxd8 14. Bxe5 Bxf2+ 15. Kxf2 Ng4+ 16. Ke2 Nxe5 17. Ne4 Ke7 18. Rhf1 Rd4 19. Nc5 Rhd8 20. Rae1 Rd2+ 21. Ke3 Nc4+ 0-1

[Event "Cucuta Region Univ Ascun"]
[Site "Cucuta"]
[Date "2016.09.02"]
[Round "5.13"]
[White "Sierra Contreras, Alden Ronaldo"]
[Black "Castillo, Julian Felipe"]
[Result "1-0"]
[ECO "B40"]
[BlackElo "1498"]
[PlyCount "43"]
[EventDate "2016.08.31"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. Nc3 g6 4. d4 cxd4 5. Qxd4 Nf6 6. Bg5 Nc6 7. Qxf6 Qxf6 8. Bxf6 Rg8 9. 0-0-0 a6 10. e5 Nb4 11. a3 Bh6+ 12. Kb1 Nc6 13. Ne4 Kf8 14. Nfg5 Bxg5 15. Nxg5 Ke8 16. Ne4 Kf8 17. Nc5 b6 18. Nxd7+ Bxd7 19. Rxd7 Ke8 20. Rd6 Ne7 21. Be2 b5 22. Rhd1 1-0

[Event "Cucuta Region Univ Ascun"]
[Site "Cucuta"]
[Date "2016.09.01"]
[Round "4.12"]
[White "Diaz Malaver, Cesar Emilio"]
[Black "Sierra Contreras, Alden Ronaldo"]
[Result "1-0"]
[ECO "D30"]
[WhiteElo "1477"]
[PlyCount "65"]
[EventDate "2016.08.31"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. e3 Nbd7 5. Be2 Be7 6. 0-0 0-0 7. Nc3 c5 8. cxd5 exd5 9. dxc5 Nxc5 10. Qc2 Be6 11. Nd4 Rc8 12. f3 a6 13. Rd1 Re8 14. Bd2 Bd6 15. Be1 Bb8 16. b4 Ncd7 17. Rac1 Qc7 18. Bg3 Qd8 19. Bxb8 Nxb8 20. Qb2 Nc6 21. Nc2 Bf5 22. Bd3 Bxd3 23. Rxd3 Ne5 24. Rdd1 Nc4 25. Qb1 Nxe3 26. Nxe3 Rxe3 27. Nxd5 Nxd5 28. Rxd5 Rxc1+ 29. Qxc1 Qe8 30. Qd2 h6 31. Kf2 Kf8 32. Qxe3 Qxe3+ 33. Kxe3 1-0

[Event "Cucuta Region Univ Ascun"]
[Site "Cucuta"]
[Date "2016.09.01"]
[Round "3.10"]
[White "Sierra Contreras, Alden Ronaldo"]
[Black "Barreto Guerrero, Osmar Alejandro"]
[Result "0-1"]
[ECO "C11"]
[BlackElo "1591"]
[PlyCount "64"]
[EventDate "2016.08.31"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Bd3 cxd4 8. Nb5 Bb4+ 9. Bd2 Bc5 10. Nd6+ Bxd6 11. exd6 0-0 12. Bxh7+ Kxh7 13. Ng5+ Kg6 14. Nxe6 fxe6 15. Qg4+ Kf7 16. f5 e5 17. Qg6+ Kg8 18. Bh6 Qh4+ 19. Qg3 Qxg3+ 20. hxg3 gxh6 21. Rxh6 Rf6 22. Rh5 Nf8 23. g4 Bd7 24. Kf2 e4 25. Rah1 e3+ 26. Kf3 Ne5+ 27. Kf4 Nc4 28. Kg5 Rxd6 29. Kf4 Re8 30. Rh8+ Kg7 31. g5 Re4+ 32. Kg3 Bxf5 0-1

