[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.07"]
[Round "9"]
[White "De La Ossa, Madera Ethan"]
[Black "Parrales, Jose David"]
[Result "1-0"]
[ECO "B33"]
[WhiteElo "1181"]
[BlackElo "1582"]
[PlyCount "41"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nf3 Bb4 7. Bd3 d5 8. exd5 Bxc3+ 9. bxc3 Nxd5 10. Bc4 Be6 11. Qd3 Ndb4 12. cxb4 Bxc4 13. Qxc4 0-0 14. 0-0 Rc8 15. Bg5 Qd6 16. Qc5 Qg6 17. Kh1 Rfe8 18. Rfe1 Nd4 19. Rxe5 Ne6 20. Qd5 Red8 21. Bxd8 1-0

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.07"]
[Round "8"]
[White "Lozano Pena, Jose Ruben"]
[Black "De La Ossa, Madera Ethan"]
[Result "0-1"]
[ECO "D00"]
[BlackElo "1181"]
[PlyCount "80"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 g6 3. Nc3 Bg7 4. Bf4 Nf6 5. e3 Nh5 6. Bg3 Nxg3 7. hxg3 Nc6 8. Bb5 Qd6 9. a3 a6 10. Be2 f5 11. Qd2 Be6 12. b4 b5 13. Bd3 Bg8 14. Be2 e5 15. dxe5 Nxe5 16. Rd1 0-0-0 17. Nb1 Nxf3+ 18. Bxf3 d4 19. 0-0 Bc4 20. Rfe1 Rhe8 21. exd4 Qxd4 22. Qg5 Qf6 23. Rxd8+ Rxd8 24. Qe3 Qd4 25. Qe7 Qf6 26. Qc5 Qd4 27. Qc6 Qa7 28. Re7 Bd4 29. Rxh7 Bxf2+ 30. Kh2 g5 31. Nc3 g4 32. Bd5 Bxg3+ 33. Kh1 Bxd5 34. Nxd5 Qb7 35. Qe6+ Kb8 36. Rd7 Qc8 37. Rxd8 Qxd8 38. Qxf5 Qh8+ 39. Kg1 Qd4+ 40. Kf1 Qd1# 0-1

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.06"]
[Round "7"]
[White "De La Ossa, Madera Ethan"]
[Black "Brito Carrascal, Isabela"]
[Result "0-1"]
[ECO "B48"]
[WhiteElo "1181"]
[BlackElo "1713"]
[PlyCount "62"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 a6 6. a3 Qc7 7. Be3 Nf6 8. Be2 Be7 9. Qd2 b5 10. b4 Nxb4 11. 0-0 Nc6 12. Nxc6 dxc6 13. f3 0-0 14. Bf2 Rd8 15. Qe3 e5 16. Qb6 Qxb6 17. Bxb6 Re8 18. Rfd1 Be6 19. a4 b4 20. Na2 Nd7 21. Bc7 Bc5+ 22. Kf1 Bd4 23. Rxd4 exd4 24. Nxb4 a5 25. Na6 Ra7 26. Bd6 Rc8 27. Rb1 c5 28. Bb5 c4 29. Rd1 Rxa6 30. Bxa6 Rc6 31. Rxd4 Rxa6 0-1

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.06"]
[Round "6"]
[White "Rhodes Guzman, Leonardo Drake"]
[Black "De La Ossa, Madera Ethan"]
[Result "0-1"]
[ECO "D00"]
[BlackElo "1181"]
[PlyCount "46"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. d4 d5 2. Bf4 g6 3. e3 Bg7 4. Bd3 Nc6 5. h4 Nf6 6. a3 a6 7. Nc3 0-0 8. Nge2 Nh5 9. Bh2 e5 10. dxe5 Nxe5 11. Bxe5 Bxe5 12. Qd2 c5 13. Ng1 d4 14. Ne4 dxe3 15. Qxe3 Bxb2 16. Rd1 Qa5+ 17. Nd2 Bg4 18. Ngf3 Rfe8 19. Be4 Bd4 20. Nxd4 cxd4 21. Qxd4 Bxd1 22. Kxd1 Rad8 23. Qe3 Rxe4 0-1

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.05"]
[Round "5"]
[White "De La Ossa, Madera Ethan"]
[Black "Caicedo Anguila, Juliana Andrea"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1181"]
[BlackElo "1709"]
[PlyCount "42"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Bd6 5. Nc3 c6 6. h3 h6 7. Bd3 Qf6 8. Qe2+ Ne7 9. 0-0 Be6 10. Be3 Nd7 11. Rad1 0-0-0 12. Na4 g5 13. Nh2 Nf5 14. Bxf5 Bxf5 15. Ng4 Bxg4 16. Qxg4 Qg6 17. Rd2 f5 18. Qe2 f4 19. c4 fxe3 20. fxe3 dxc4 21. Qxc4 Qe4 0-1

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.04"]
[Round "4"]
[White "De La Ossa, Madera Ethan"]
[Black "Estrada Gomez, Juan Andres"]
[Result "1-0"]
[ECO "B44"]
[WhiteElo "1181"]
[PlyCount "85"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. g3 Nf6 6. Bg2 Bc5 7. Be3 Qb6 8. c3 Qxb2 9. Qc2 Qxc2 10. Nxc2 d6 11. Nd2 Ne5 12. 0-0 0-0 13. Bxc5 dxc5 14. Rad1 Rb8 15. f4 Ng6 16. Ne3 b6 17. e5 Ne8 18. Ndc4 Bb7 19. Rd7 Bxg2 20. Kxg2 a6 21. Rfd1 b5 22. Na5 Rc8 23. Ra7 Nc7 24. Rd7 Nd5 25. Nxd5 exd5 26. Rxd5 Rfd8 27. Rd6 Ra8 28. Nc6 Rdc8 29. Rb7 Re8 30. h4 h5 31. Rdd7 Nh8 32. Kf3 Kf8 33. Ke4 Rac8 34. Kd5 c4 35. f5 Ra8 36. e6 fxe6+ 37. fxe6 g6 38. Kd6 Rac8 39. Ne5 Rb8 40. e7+ Kg7 41. Rxb8 Rxb8 42. e8Q+ Kh6 43. Qxb8 1-0

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.04"]
[Round "3"]
[White "Perez Pertuz, Carlos Mario"]
[Black "De La Ossa, Madera Ethan"]
[Result "1-0"]
[ECO "C34"]
[WhiteElo "1775"]
[BlackElo "1181"]
[PlyCount "57"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. e4 e5 2. f4 exf4 3. Nf3 g6 4. Bc4 Bg7 5. 0-0 Nh6 6. d4 0-0 7. Bxf4 d6 8. h3 Kh8 9. Qd2 Ng8 10. Nc3 Nc6 11. Be3 f5 12. exf5 Bxf5 13. Ng5 Nh6 14. g4 Bd7 15. Rxf8+ Qxf8 16. Rf1 Qd8 17. Nce4 Ne7 18. Ne6 Bxe6 19. Bxe6 Nhg8 20. Ng5 Nh6 21. d5 Neg8 22. Rf7 Nf6 23. Bd4 c5 24. Bxf6 Qxf6 25. Rxf6 Bxf6 26. Ne4 Bd4+ 27. Kg2 Ng8 28. c3 Bf6 29. g5 1-0

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.03"]
[Round "1"]
[White "Brito Carrascal, Camilo Andres"]
[Black "De La Ossa, Madera Ethan"]
[Result "1-0"]
[ECO "C60"]
[WhiteElo "1985"]
[BlackElo "1181"]
[PlyCount "103"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 4. c3 Bg7 5. d4 a6 6. Bxc6 dxc6 7. Nxe5 Bxe5 8. dxe5 Qxd1+ 9. Kxd1 Be6 10. Kc2 Ke7 11. Bg5+ Kf8 12. Nd2 Kg7 13. Nb3 h6 14. Be3 Rd8 15. a4 Ne7 16. Nc5 Bc8 17. a5 Rhe8 18. h4 Ng8 19. Bd4 Re7 20. b4 Rde8 21. f3 h5 22. Rhd1 Nh6 23. Rd2 Kf8 24. Rad1 Kg8 25. Be3 Kh7 26. Bg5 Rxe5 27. Bf6 Ng8 28. Bxe5 Rxe5 29. Rd8 Ne7 30. Nd7 Bxd7 31. R1xd7 Kg7 32. Re8 Kf6 33. Kd3 b6 34. f4 Re6 35. e5+ Kf5 36. Rexe7 Kxf4 37. Rxe6 fxe6 38. axb6 cxb6 39. Rd6 Kxe5 40. Rxc6 Kf5 41. Rxb6 e5 42. Rxa6 Kf4 43. Rxg6 e4+ 44. Ke2 e3 45. b5 Kf5 46. Rd6 Kg4 47. Rd4+ Kg3 48. b6 Kh2 49. b7 Kh1 50. b8Q Kg1 51. Qg3 Kh1 52. Rd1# 1-0

[Event "Barranquilla Carnaval Cup"]
[Site "Barranquilla"]
[Date "2024.02.03"]
[Round "2"]
[White "De La Ossa, Madera Ethan"]
[Black "Gomez Solorzano, Marianne"]
[Result "1-0"]
[ECO "B76"]
[WhiteElo "1181"]
[BlackElo "1303"]
[PlyCount "69"]
[EventDate "2024.02.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB07_2024"]
[SourceDate "2024.02.14"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Be2 0-0 8. Qd2 d6 9. f3 Bd7 10. h4 h5 11. 0-0-0 e5 12. Nxc6 Bxc6 13. Qxd6 Nd7 14. Bc4 a6 15. Qxg6 Qf6 16. Qxf6 Bxf6 17. g4 hxg4 18. fxg4 b5 19. Bd5 Bxd5 20. Nxd5 a5 21. Nc7 Rad8 22. g5 Be7 23. Nd5 Bb4 24. Nxb4 axb4 25. Rd5 f6 26. Rhd1 Rf7 27. g6 Rg7 28. h5 Re7 29. h6 b3 30. axb3 Ra8 31. Kb1 Nf8 32. Rd8 Ra6 33. Bc5 Rae6 34. Rxf8+ Kxf8 35. Rd8# 1-0

[Event "Cartagena Plazuela op"]
[Site "Cartagena"]
[Date "2022.07.23"]
[Round "6"]
[White "De La Ossa, Madera Ethan"]
[Black "Valle, Efrain"]
[Result "0-1"]
[ECO "B00"]
[WhiteElo "1414"]
[BlackElo "2006"]
[PlyCount "52"]
[EventDate "2022.07.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 Nc6 2. d4 e5 3. d5 Nce7 4. Bd3 Ng6 5. Nc3 Bc5 6. Be3 Bxe3 7. fxe3 d6 8. Qe2 Nh6 9. Nf3 0-0 10. 0-0-0 f5 11. h3 f4 12. Rhg1 Bd7 13. g4 fxe3 14. Qxe3 Nf4 15. Rg3 g5 16. Rdg1 Nf7 17. Ne2 Qf6 18. Qd2 c5 19. c4 a6 20. Nxf4 exf4 21. R3g2 b5 22. b3 bxc4 23. bxc4 Qa1+ 24. Bb1 Rab8 25. Qd3 Rxb1+ 26. Qxb1 Qc3+ 0-1

[Event "Cartagena Plazuela op"]
[Site "Cartagena"]
[Date "2022.07.23"]
[Round "5"]
[White "Merino Vanegas, Santiago Andres"]
[Black "De La Ossa, Madera Ethan"]
[Result "1/2-1/2"]
[ECO "C53"]
[WhiteElo "1136"]
[BlackElo "1414"]
[PlyCount "46"]
[EventDate "2022.07.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 d6 5. d4 Bb6 6. dxe5 dxe5 7. Qxd8+ Nxd8 8. Nxe5 f6 9. Nf3 Nc6 10. Bf4 Bg4 11. Nbd2 Nge7 12. 0-0 g5 13. Bg3 0-0-0 14. Nb3 Ng6 15. h3 Bxf3 16. gxf3 Nce5 17. Bxe5 Nxe5 18. Be2 h5 19. Nd4 g4 20. f4 Bxd4 21. cxd4 Rxd4 22. fxe5 Rxe4 23. Bd3 Rxe5 1/2-1/2

[Event "Cartagena Plazuela op"]
[Site "Cartagena"]
[Date "2022.07.22"]
[Round "4"]
[White "De La Ossa, Madera Ethan"]
[Black "Fernandez Noriega, Adriana Sofia"]
[Result "1/2-1/2"]
[ECO "C28"]
[WhiteElo "1414"]
[BlackElo "1435"]
[PlyCount "118"]
[EventDate "2022.07.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. Bg5 h6 6. Bxf6 Qxf6 7. Qf3 Qxf3 8. Nxf3 0-0 9. a3 a6 10. Nd5 Bb6 11. c3 d6 12. 0-0 Be6 13. Nxb6 cxb6 14. Bxe6 fxe6 15. d4 exd4 16. Nxd4 e5 17. Nf5 Rad8 18. Rad1 Rf6 19. Ne3 Ne7 20. Nd5 Nxd5 21. Rxd5 Kf7 22. g3 g5 23. g4 Ke7 24. Kg2 Rh8 25. Rd3 Rf4 26. f3 h5 27. h3 hxg4 28. hxg4 Kd7 29. Rfd1 Rh6 30. Rd5 Kc6 31. b4 b5 32. R1d3 b6 33. Rd2 Rhf6 34. R5d3 Re6 35. Ra2 Rff6 36. a4 bxa4 37. Rxa4 Kb5 38. Ra2 Kc4 39. Re3 Kb5 40. Rd2 Re7 41. Red3 Kc6 42. c4 Rd7 43. Rd5 b5 44. Rc2 bxc4 45. Rxc4+ Kb6 46. Ra5 Rdf7 47. Rc3 Rd7 48. Rd3 Ra7 49. Rad5 Rd7 50. Rxe5 dxe5 51. Rxd7 Kb5 52. Rd5+ Kxb4 53. Rxe5 Rg6 54. Kf2 a5 55. Ke2 a4 56. Kd2 Rc6 57. Rxg5 a3 58. Rg8 a2 59. Ra8 Kb3 1/2-1/2

[Event "Cartagena Plazuela op"]
[Site "Cartagena"]
[Date "2022.07.22"]
[Round "3"]
[White "Sepulveda Brango, Alberto Enrique"]
[Black "De La Ossa, Madera Ethan"]
[Result "1/2-1/2"]
[ECO "B00"]
[WhiteElo "1231"]
[BlackElo "1414"]
[PlyCount "104"]
[EventDate "2022.07.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qf6 5. Nxc6 Qxc6 6. Nc3 Bb4 7. Bd2 Bxc3 8. Bxc3 Qxe4+ 9. Qe2 Qxe2+ 10. Bxe2 Nf6 11. 0-0-0 d6 12. Rhe1 Be6 13. Bc4 Kd7 14. Bxe6+ fxe6 15. Rd3 Rae8 16. Kd2 Rhf8 17. Rg3 Rf7 18. Rh3 h6 19. Ree3 Ref8 20. f3 Nd5 21. Re4 e5 22. Rg3 Nxc3 23. Kxc3 c5 24. Rg6 b5 25. a3 a6 26. b4 c4 27. Kd2 Re8 28. Reg4 Ree7 29. c3 Kc6 30. Ke3 Kd5 31. g3 Rd7 32. Re4 Rd8 33. Rgg4 g5 34. f4 gxf4+ 35. gxf4 Rdf8 36. Kf3 Rxf4+ 37. Rgxf4 Rxf4+ 38. Rxf4 exf4 39. Kxf4 Ke6 40. Ke4 d5+ 41. Kd4 Kf5 42. Kxd5 Kf4 43. Kd4 h5 44. h4 Kg4 45. Kc5 Kxh4 46. Kb6 Kg4 47. Kxa6 h4 48. Kxb5 h3 49. Kxc4 h2 50. b5 h1Q 51. a4 Qe4+ 52. Kb3 Qd5+ 1/2-1/2

[Event "Cartagena Plazuela op"]
[Site "Cartagena"]
[Date "2022.07.21"]
[Round "2"]
[White "De La Ossa, Madera Ethan"]
[Black "Merino Yudex, Julian Jesus"]
[Result "1-0"]
[ECO "B13"]
[WhiteElo "1414"]
[BlackElo "1234"]
[PlyCount "41"]
[EventDate "2022.07.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nf3 Bg4 6. h3 Bxf3 7. Qxf3 e6 8. c5 a6 9. a4 Nc6 10. Be3 Nb4 11. Qd1 Be7 12. Qb3 a5 13. Bb5+ Nc6 14. Nd2 Ne4 15. Nxe4 dxe4 16. 0-0 Qd5 17. Bc4 Qd7 18. Rfd1 0-0 19. d5 exd5 20. Bxd5 Qc7 21. Bxe4 1-0

[Event "Cartagena Plazuela op"]
[Site "Cartagena"]
[Date "2022.07.21"]
[Round "1"]
[White "Varela Sanchez, David Yoel"]
[Black "De La Ossa, Madera Ethan"]
[Result "1-0"]
[ECO "C44"]
[WhiteElo "1342"]
[BlackElo "1414"]
[PlyCount "37"]
[EventDate "2022.07.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 209 Extra"]
[Source "ChessBase"]
[SourceDate "2022.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2022.09.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 d5 4. dxe5 dxe4 5. Qxd8+ Nxd8 6. Ng5 Bf5 7. Nd2 e3 8. fxe3 Bxc2 9. Bc4 h6 10. Ngf3 Nc6 11. 0-0 0-0-0 12. Bxf7 Bc5 13. Nb3 Bb6 14. Be6+ Kb8 15. Nbd4 Nxd4 16. Nxd4 Bxd4 17. exd4 Rxd4 18. Rf8+ Rd8 19. Rxd8# 1-0

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.10"]
[Round "8"]
[White "Payares Diaz, Alejandro"]
[Black "De La Ossa, Madera Ethan"]
[Result "1-0"]
[ECO "C36"]
[WhiteElo "1427"]
[BlackElo "1473"]
[PlyCount "33"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. f4 d5 3. exd5 exf4 4. Nf3 Bd6 5. d4 Nf6 6. Nc3 0-0 7. Be2 Bg4 8. 0-0 Re8 9. Ne1 Bxe2 10. Nxe2 Nxd5 11. Nxf4 Nxf4 12. Bxf4 Nc6 13. c3 Qf6 14. Nd3 Rad8 15. Qd2 Nxd4 16. Bg5 Qe5 17. Nxe5 1-0

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.09"]
[Round "7"]
[White "De La Ossa, Madera Ethan"]
[Black "Sepulveda Navarro, Danilson David"]
[Result "1-0"]
[ECO "B30"]
[WhiteElo "1473"]
[PlyCount "76"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bc4 e5 4. Nc3 d6 5. d3 h6 6. a3 Nf6 7. Bd2 Nd4 8. h3 a6 9. Nxd4 exd4 10. Nd5 b5 11. Nxf6+ Qxf6 12. Bd5 Rb8 13. Ba5 Bd7 14. Qf3 Be7 15. Qxf6 Bxf6 16. Bc7 Rc8 17. Bxd6 c4 18. dxc4 bxc4 19. Bb7 Rc6 20. Bxc6 Bxc6 21. 0-0-0 Kd7 22. e5 Bg5+ 23. Kb1 Bxg2 24. Rh2 Bc6 25. Rxd4 Ke6 26. h4 Be7 27. Bxe7 Kxe7 28. Rxc4 Bd5 29. Rd4 Ke6 30. c4 Kxe5 31. Rxd5+ Ke6 32. f4 f5 33. Rg2 Rc8 34. Rg6+ Kf7 35. Rxa6 Rxc4 36. Rxf5+ Kg8 37. h5 Rd4 38. Ra8+ Kh7 1-0

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.09"]
[Round "6"]
[White "Rueda Ahumada, Gabriel Omar"]
[Black "De La Ossa, Madera Ethan"]
[Result "1-0"]
[ECO "C70"]
[WhiteElo "1482"]
[BlackElo "1473"]
[PlyCount "81"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. 0-0 d6 5. c3 a6 6. Ba4 b5 7. Bc2 Bg4 8. d3 h6 9. Nbd2 Nge7 10. Re1 0-0 11. h3 Bxf3 12. Nxf3 Ng6 13. d4 Bb6 14. Be3 Nce7 15. Qd2 c5 16. Rad1 Qc7 17. d5 a5 18. Nh2 Nh8 19. f4 f6 20. Ng4 c4 21. fxe5 fxe5 22. Nxe5 dxe5 23. d6 Bxe3+ 24. Rxe3 Qb7 25. dxe7 Qxe7 26. Rg3 Rad8 27. Qxh6 Rxd1+ 28. Bxd1 Qa7+ 29. Qe3 Qxe3+ 30. Rxe3 Rd8 31. Bf3 Rd2 32. Re2 Rd1+ 33. Kf2 Ra1 34. a3 b4 35. axb4 axb4 36. cxb4 Ra4 37. Bg4 Rxb4 38. Be6+ Kh7 39. Rc2 c3 40. bxc3 Rxe4 41. Bf5+ 1-0

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.08"]
[Round "5"]
[White "De La Ossa, Madera Ethan"]
[Black "Merino Vanegas, Santiago Andres"]
[Result "1/2-1/2"]
[ECO "B50"]
[WhiteElo "1473"]
[BlackElo "1136"]
[PlyCount "95"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Nc3 Nf6 4. Bc4 Nc6 5. d3 a6 6. a4 e6 7. h3 Be7 8. Bf4 d5 9. Bb3 0-0 10. 0-0 b6 11. e5 Nd7 12. Re1 Na5 13. Ba2 Rb8 14. b3 b5 15. Qd2 b4 16. Ne2 Nb6 17. Rac1 d4 18. Ng3 Bb7 19. Ne4 Bxe4 20. Rxe4 Nd5 21. Ree1 Nxf4 22. Qxf4 Nc6 23. Rcd1 h6 24. Qe4 Na5 25. Nd2 Qd7 26. Nc4 Nxc4 27. dxc4 a5 28. Rd3 Qb7 29. Qg4 Kh7 30. Rg3 Rg8 31. f4 Rbf8 32. f5 Qc8 33. fxe6 Qxe6 34. Qe4+ f5 35. exf6+ Qxe4 36. Rxe4 Bxf6 37. h4 Re8 38. Rgg4 Re5 39. Rxe5 Bxe5 40. g3 Re8 41. Bb1 Kg8 42. Kg2 Re7 43. Re4 Bf6 44. Kf3 Kf7 45. Rxe7+ Kxe7 46. h5 Ke6 47. Ke4 Bg5 48. g4 1/2-1/2

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.08"]
[Round "4"]
[White "De la Hoz Paternina, Felix Daniel"]
[Black "De La Ossa, Madera Ethan"]
[Result "1-0"]
[ECO "D06"]
[WhiteElo "1362"]
[BlackElo "1473"]
[PlyCount "103"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 Nf6 3. cxd5 Bf5 4. Nc3 Nxd5 5. Nf3 e6 6. Qb3 Nc6 7. a3 Na5 8. Qa4+ c6 9. e3 a6 10. Be2 b5 11. Qd1 Bd6 12. Nd2 e5 13. e4 Nxc3 14. bxc3 Bg6 15. 0-0 0-0 16. f3 Qb6 17. Bb2 Rfe8 18. Kh1 f6 19. Bd3 Rad8 20. Nb3 Kh8 21. Nxa5 Qxa5 22. Qc2 Qb6 23. Qf2 Bc7 24. a4 a5 25. axb5 cxb5 26. d5 b4 27. Qxb6 Bxb6 28. Bb5 Re7 29. Rfd1 Rd6 30. cxb4 axb4 31. Ra4 h6 32. Rxb4 Be8 33. Bxe8 Rxe8 34. Rc4 Red8 35. Rdc1 Kh7 36. Rc6 R8d7 37. Ba3 Rxc6 38. Rxc6 Bd8 39. Rd6 Rxd6 40. Bxd6 Kg8 41. Kg1 Kf7 42. Kf2 g5 43. Kg3 h5 44. h4 Kg6 45. hxg5 Kxg5 46. f4+ exf4+ 47. Bxf4+ Kg6 48. Kf3 Kg7 49. Ke3 Kf7 50. Bb8 Ke7 51. Kf4 h4 52. Kf5 1-0

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.07"]
[Round "3"]
[White "De La Ossa, Madera Ethan"]
[Black "Alzate Araujo, Miguel Angel"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "1473"]
[BlackElo "1217"]
[PlyCount "71"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Qb3 Qc7 7. Be3 Nh6 8. Nbd2 Nf5 9. Be2 Nxe3 10. fxe3 b6 11. Qc2 Bb7 12. 0-0 Be7 13. Rac1 0-0 14. a3 f6 15. Bb5 fxe5 16. Bxc6 Bxc6 17. Nxe5 Bb5 18. Rxf8+ Rxf8 19. b4 Bd6 20. Ndf3 Be8 21. Ng5 Rf6 22. Qxh7+ Kf8 23. Qh8+ Ke7 24. Qxg7+ Kd8 25. Qxf6+ Be7 26. Nxe6+ Kc8 27. Nxc7 Bxf6 28. Nxe8 Bg5 29. Kf2 c4 30. g3 Kb7 31. h4 Be7 32. Nf7 Ka6 33. a4 Kb7 34. h5 Kc8 35. Nfd6+ Kd7 36. h6 1-0

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.07"]
[Round "2"]
[White "Varela Sanchez, David Yoel"]
[Black "De La Ossa, Madera Ethan"]
[Result "1-0"]
[ECO "C45"]
[WhiteElo "1342"]
[BlackElo "1473"]
[PlyCount "73"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nb3 Bb6 6. Nc3 d6 7. Bd3 Nf6 8. 0-0 Bg4 9. Qe1 Qd7 10. Na4 0-0-0 11. Nxb6+ axb6 12. a4 Be6 13. Bd2 Bxb3 14. cxb3 Ne5 15. Bc2 Qc6 16. Rc1 Rhe8 17. f3 d5 18. f4 Ng6 19. e5 Nd7 20. Bf5 Qd6 21. exd6 Rxe1 22. Rxc7+ Kb8 23. Rxe1 Nc5 24. Rxf7 Rxd6 25. b4 Na6 26. Rxg7 d4 27. Bxg6 hxg6 28. f5 gxf5 29. Bf4 d3 30. Bxd6+ Nc7 31. Bxc7+ Ka7 32. Bf4 d2 33. Bxd2 f4 34. Ree7 b5 35. Rxb7+ Ka8 36. Bxf4 bxa4 37. Rb8# 1-0

[Event "COL-ch U20"]
[Site "Barranquilla"]
[Date "2022.07.06"]
[Round "1"]
[White "De La Ossa, Madera Ethan"]
[Black "Brito Carrascal, Camilo Andres"]
[Result "0-1"]
[ECO "B20"]
[WhiteElo "1473"]
[BlackElo "1678"]
[PlyCount "130"]
[EventDate "2022.07.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. Bc4 a6 4. a4 Nc6 5. d3 Nf6 6. Bg5 Be7 7. Nf3 Qc7 8. h3 b6 9. 0-0 Bb7 10. Qd2 d6 11. Rfe1 0-0 12. Qf4 Nd4 13. Nxd4 cxd4 14. Ne2 h6 15. Bxf6 Bxf6 16. Ng3 Qc5 17. Qd2 Qg5 18. Qxg5 hxg5 19. Bb3 Rfc8 20. Re2 Rc7 21. f3 g6 22. Kf2 Rac8 23. Rc1 b5 24. axb5 axb5 25. Nf1 Ra8 26. g3 Bc8 27. Nh2 e5 28. Ng4 Bg7 29. Rf1 Be6 30. Bxe6 fxe6 31. b3 Rc3 32. Rd1 Kf7 33. Rdd2 Ra2 34. Kg2 Bf8 35. Kf2 Be7 36. Kg2 Bd8 37. Kf2 Ba5 38. Kf1 Ra1+ 39. Kg2 Rc1 40. Rf2 Ke7 41. Rde2 Rc7 42. Kh2 Be1 43. Rg2 Ra7 44. Rg1 Raa1 45. Kg2 Bc3 46. Rxc1 Rxc1 47. Kf2 Ba5 48. Kg2 Bd8 49. Rf2 Kd7 50. f4 gxf4 51. gxf4 exf4 52. e5 g5 53. exd6 Kxd6 54. Kf3 Rg1 55. Rg2 Re1 56. Re2 Rg1 57. Rg2 Rxg2 58. Kxg2 Kc5 59. Nf2 Kb4 60. Nd1 Ka3 61. Kf3 Ka2 62. Ke2 Kb1 63. c4 Kc2 64. cxb5 f3+ 65. Kxf3 Kxd1 0-1

