[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.02.02"]
[Round "9"]
[White "Gomez Henao, Emanuel Fernando"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C01"]
[PlyCount "63"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4 c6 5. Nf3 Nf6 6. Bd3 Be6 7. 0-0 b6 8. cxd5 cxd5 9. Bg5 Be7 10. Re1 0-0 11. Qc2 Nfd7 12. Bxh7+ Kh8 13. Bxe7 Qxe7 14. Bf5 Qf6 15. Bxe6 fxe6 16. Nc3 Nc6 17. Rad1 Rad8 18. h4 Rc8 19. Ng5 g6 20. Rxe6 Qf4 21. g3 Qf5 22. Qxf5 gxf5 23. Nxd5 Nd8 24. Rh6+ Kg7 25. Rh7+ Kg6 26. Rxd7 Rc2 27. Rd6+ Kh5 28. Re1 Nf7 29. Nf4+ Kg4 30. Rg6 Nxg5 31. Rxg5+ Kf3 32. Re3# 1-0

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.02.02"]
[Round "8"]
[White "Obando Alzate, Mathias"]
[Black "Guayazan Galeano, Juan David"]
[Result "0-1"]
[ECO "C01"]
[PlyCount "77"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nf6 5. Bd3 Bd6 6. Nc3 0-0 7. 0-0 c5 8. Bg5 Be7 9. Re1 c4 10. Bf1 Bg4 11. g3 Bb4 12. Bg2 Qb6 13. Rb1 Nbd7 14. Qc1 Bxf3 15. Bxf3 Qxd4 16. Qe3 Qxe3 17. Bxe3 Rfe8 18. Bd4 Bxc3 19. Bxc3 Ne4 20. Bxe4 Rxe4 21. Rbd1 Rxe1+ 22. Rxe1 Kf8 23. Bb4+ Kg8 24. Re7 Rd8 25. Bd6 Nf8 26. Bb4 d4 27. Bd2 Nd7 28. Bg5 f6 29. Bf4 Nc5 30. Kf1 d3 31. cxd3 cxd3 32. Ke1 Kf8 33. Re3 Na4 34. Kd2 Nxb2 35. Re4 Rc8 36. Bd6+ Kg8 37. Ba3 Rc2+ 38. Ke3 Re2+ 39. Kf3 0-1

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.02.01"]
[Round "6"]
[White "Cabarique Tirado, Diego Alejandro"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "1698"]
[PlyCount "107"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3 Nge7 7. b4 cxd4 8. cxd4 Nf5 9. Bb2 Be7 10. Bd3 Bd7 11. Bxf5 exf5 12. Qd3 0-0 13. 0-0 Nd8 14. Re1 Ne6 15. Nbd2 a6 16. Nb3 Nf4 17. Qd2 Ne6 18. Nc5 Bxc5 19. dxc5 Qc7 20. Qxd5 Bc6 21. Qd6 Bxf3 22. gxf3 Qd8 23. Qxd8 Raxd8 24. Rad1 Ng5 25. Kg2 Rfe8 26. h4 Ne6 27. Kg3 h6 28. f4 Kf8 29. h5 Ke7 30. Kf3 g5 31. hxg6 fxg6 32. Rh1 h5 33. Ke3 Kf7 34. Rd6 Kg7 35. Rhd1 Rh8 36. Rxd8 Rxd8 37. Rd6 Re8 38. Rd7+ Kh6 39. Rxb7 h4 40. Bc1 Rh8 41. Kf3 Kh5 42. Kg2 Nd4 43. a4 Kg4 44. Rb6 h3+ 45. Kh1 Rd8 46. Rd6 Nc6 47. Rxd8 Nxd8 48. b5 axb5 49. axb5 Ne6 50. Be3 Nxf4 51. c6 Nd5 52. b6 f4 53. Bc5 Kf3 54. c7 1-0

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.02.01"]
[Round "7"]
[White "Moreno Palacios, Alejandro"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "1517"]
[PlyCount "73"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nc6 5. Bg5 f6 6. Be3 Bd6 7. Nc3 Nge7 8. Bb5 0-0 9. Ba4 Bb4 10. 0-0 Nf5 11. Nxd5 Be6 12. Nf4 Qd6 13. d5 Bxd5 14. Qxd5+ Qxd5 15. Nxd5 Bd6 16. Rfe1 a6 17. Bb3 Kh8 18. Rad1 Rac8 19. Nd4 Ncxd4 20. Bxd4 Nxd4 21. Rxd4 Bc5 22. Rd2 c6 23. Nc3 Rfe8 24. Rxe8+ Rxe8 25. Re2 Rd8 26. g3 h6 27. Bf7 Kh7 28. h4 Rf8 29. Bc4 b5 30. Bd3+ Kh8 31. Bg6 Rd8 32. Re8+ Rxe8 33. Bxe8 Kg8 34. Bxc6 b4 35. Ne4 Bd4 36. c3 bxc3 37. bxc3 1-0

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.01.31"]
[Round "4"]
[White "Contreras Salcedo, Samuel Esteban"]
[Black "Obando Alzate, Mathias"]
[Result "0-1"]
[ECO "C01"]
[WhiteElo "1482"]
[PlyCount "70"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Bd3 Nc6 5. Nf3 Be6 6. 0-0 Nf6 7. Bg5 Be7 8. Ne5 Qd6 9. Nxc6 Ng4 10. f4 Bxg5 11. Ne5 Ne3 12. Qf3 Nxf1 13. Qxf1 Qb6 14. Nc3 Qxd4+ 15. Kh1 Bxf4 16. Bb5+ c6 17. Nxc6 bxc6 18. Bxc6+ Ke7 19. Re1 Rad8 20. Bxd5 Rxd5 21. Nxd5+ Qxd5 22. Qxf4 Re8 23. Qh4+ Kf8 24. Qxh7 f6 25. Qh8+ Bg8 26. Qh4 Qd2 27. Rg1 Re2 28. Qg4 Bd5 29. Qc8+ Re8 30. Qg4 Bxa2 31. b3 Qxc2 32. Qb4+ Re7 33. Qb8+ Kf7 34. Qd6 Qxb3 35. Qd2 Qd5 0-1

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.01.31"]
[Round "5"]
[White "Obando Alzate, Mathias"]
[Black "Buitrago Garces, Maicol"]
[Result "0-1"]
[ECO "B45"]
[BlackElo "1621"]
[PlyCount "89"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Nf6 6. Bg5 h6 7. Bh4 d6 8. f4 Be7 9. Qf3 Nxd4 10. Qd3 Nc6 11. 0-0-0 a6 12. Be2 Qa5 13. Kb1 b5 14. Bf3 e5 15. fxe5 Nxe5 16. Qd4 Be6 17. b3 Rc8 18. Ne2 Qa3 19. Bxf6 gxf6 20. Nf4 Nxf3 21. gxf3 Qc5 22. Qd3 Qc3 23. Qe2 f5 24. Nxe6 fxe6 25. exf5 e5 26. Rhe1 Rc5 27. f4 h5 28. Qg2 Kf8 29. Rg1 exf4 30. Rd3 Qf6 31. Qa8+ Kf7 32. Qe4 Rxf5 33. c4 Rg8 34. Rc1 f3 35. cxb5 axb5 36. Rd5 Rgg5 37. Rcd1 Rxd5 38. Rxd5 Rg1+ 39. Kc2 f2 40. Qh7+ Ke6 41. Qe4+ Kd7 42. Qe3 Rc1+ 43. Kxc1 f1Q+ 44. Rd1 Qa1+ 45. Kd2 0-1

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.01.30"]
[Round "3"]
[White "Obando Alzate, Mathias"]
[Black "Delgado Caballero, Kevin Daniel"]
[Result "0-1"]
[ECO "C50"]
[BlackElo "1576"]
[PlyCount "34"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Bc5 5. d3 d6 6. 0-0 Bg4 7. h3 Bh5 8. Be3 h6 9. Bxc5 dxc5 10. Bd5 Nd4 11. Bxb7 Bxf3 12. gxf3 Rb8 13. Bd5 Nh5 14. Kh1 Qh4 15. Kh2 Nf4 16. Rh1 Qxh3+ 17. Kg1 Qg2# 0-1

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.01.30"]
[Round "2"]
[White "Rivera Robayo, Juan Jose"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "1655"]
[PlyCount "59"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bd3 Nfd7 5. exd5 exd5 6. Nxd5 c6 7. Qe2+ Be7 8. Qxe7+ Qxe7+ 9. Nxe7 Kxe7 10. Nf3 Re8 11. 0-0 Nf6 12. Bf4 Kf8 13. Rfe1 Be6 14. Ng5 Kg8 15. Nxe6 fxe6 16. Re2 Nbd7 17. Rae1 Kf7 18. c3 Rac8 19. Bd6 Nb6 20. g3 Nbd5 21. Rd2 Nc7 22. Bf1 h6 23. f4 Nh7 24. Rde2 Nb5 25. Bb4 b6 26. Rxe6 Nf8 27. Rxe8 Rxe8 28. Bc4+ Ne6 29. Rxe6 Rxe6 30. f5 1-0

[Event "COL-ch U20"]
[Site "Bogota"]
[Date "2025.01.29"]
[Round "1"]
[White "Obando Alzate, Mathias"]
[Black "Cuello Garcia, Richard Orlando"]
[Result "0-1"]
[ECO "B08"]
[BlackElo "1757"]
[PlyCount "78"]
[EventDate "2025.01.29"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB06_2025"]
[SourceDate "2025.02.05"]
[SourceVersion "1"]
[SourceVersionDate "2025.02.05"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5 Bg7 5. Nf3 0-0 6. Bc4 c6 7. Bb3 b5 8. 0-0 b4 9. Bxf6 Bxf6 10. Ne2 Bg4 11. Qd3 Qb6 12. c3 a5 13. Rab1 Rd8 14. h3 Bc8 15. Ng3 a4 16. Bc2 Ba6 17. c4 e5 18. dxe5 dxe5 19. Qe2 b3 20. axb3 axb3 21. Bd3 c5 22. Rbd1 Nc6 23. Bb1 Qb4 24. Rxd8+ Rxd8 25. Rc1 Nd4 26. Nxd4 Rxd4 27. Bd3 Bg5 28. Ra1 Bxc4 29. Bxc4 Qxc4 30. Qg4 Bd8 31. Nf5 Rxe4 32. Rd1 Bf6 33. Qg3 Qc2 34. Ne3 Rxe3 35. Qxe3 Qxd1+ 36. Kh2 Qd4 37. Qxb3 Qxf2 38. Qb5 Kg7 39. b3 Bg5 0-1

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "3"]
[White "Artunduaga Tapiero, Nicolas"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "B40"]
[BlackElo "1370"]
[PlyCount "101"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. exd5 exd5 4. Nc3 c5 5. Qe2+ Ne7 6. g3 Nbc6 7. Bg2 Be6 8. 0-0 Qb6 9. Ne5 Nxe5 10. Qxe5 Nc6 11. Qe2 Nd4 12. Qd1 Bd6 13. Bxd5 Bxd5 14. Nxd5 Qa5 15. Re1+ Ne6 16. c3 0-0 17. b4 cxb4 18. cxb4 Bxb4 19. Nxb4 Qxb4 20. Qb3 Qb6 21. Ba3 Rfe8 22. Qxb6 axb6 23. Bb2 Rac8 24. Bc3 Ng5 25. Kg2 Re6 26. h4 Ne4 27. f3 Nxc3 28. Rxe6 fxe6 29. dxc3 Rxc3 30. Re1 Kf7 31. Rb1 Rc2+ 32. Kh3 Rxa2 33. Rxb6 Kf6 34. Rxb7 Ra3 35. Kg2 Ra2+ 36. Kh3 h6 37. g4 g5 38. hxg5+ hxg5 39. Kg3 Ra3 40. Rb8 Ke7 41. Rb7+ Kf6 42. Rb6 Ke7 43. Kf2 Ra2+ 44. Kg3 Ra3 45. Rb4 Kf6 46. Re4 e5 47. Kf2 Ra2+ 48. Kg3 Ke6 49. f4 gxf4+ 50. Kf3 Ra3+ 51. Kf2 1-0

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "1"]
[White "Lopez Mahecha, Natalia"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C10"]
[WhiteElo "1712"]
[BlackElo "1370"]
[PlyCount "51"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 c5 4. dxc5 d4 5. Bb5+ Nc6 6. Nce2 e5 7. Nf3 f6 8. 0-0 Bg4 9. Qd3 Nge7 10. h3 Bd7 11. c3 a6 12. Ba4 Qc7 13. cxd4 exd4 14. Nexd4 0-0-0 15. Qc3 Ne5 16. Bxd7+ Rxd7 17. Ne6 Qc6 18. Nxe5 fxe5 19. Qxe5 Ng6 20. Qf5 Be7 21. Nxg7 Rf8 22. Qg4 Qxc5 23. Nf5 Ne5 24. Nxe7+ Qxe7 25. Qe2 Rf6 26. Bg5 1-0

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "4"]
[White "Obando Alzate, Mathias"]
[Black "Arias Romero, Erick Orlando"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "1370"]
[PlyCount "31"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nc3 d6 4. Bc4 Bg4 5. 0-0 Bxf3 6. Qxf3 a5 7. a4 Nc6 8. d3 h5 9. Nd5 Rh6 10. Bxh6 gxh6 11. Nxf6+ Ke7 12. Nd5+ Kd7 13. Qf5+ Ke8 14. Nf6+ Ke7 15. Ng8+ Ke8 16. Qxf7# 1-0

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "2"]
[White "Obando Alzate, Mathias"]
[Black "Moreno Palacios, Alejandro"]
[Result "0-1"]
[ECO "B43"]
[WhiteElo "1370"]
[BlackElo "1592"]
[PlyCount "64"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Qd3 d6 7. f4 Nd7 8. Nf3 Ngf6 9. b3 b6 10. Bb2 Bb7 11. Be2 Nc5 12. Qe3 Ncxe4 13. Nxe4 Nxe4 14. 0-0 Be7 15. Bxg7 Rg8 16. Bd4 b5 17. a4 Bf6 18. Bxf6 Nxf6 19. Bd3 Nd5 20. Qd2 h6 21. Rfe1 Qc3 22. Qf2 Nxf4 23. axb5 Nh3+ 24. Kf1 Nxf2 25. Kxf2 axb5 26. Bxb5+ Ke7 27. Rxa8 Bxa8 28. Bf1 Qxc2+ 29. Re2 Qxb3 30. Re3 Qc2+ 31. Be2 Bxf3 32. gxf3 Rg5 0-1

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "6"]
[White "Obando Alzate, Mathias"]
[Black "Vasquez Sanchez, Juan Pablo"]
[Result "0-1"]
[ECO "B70"]
[WhiteElo "1370"]
[BlackElo "1507"]
[PlyCount "32"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Nf3 Bg7 7. e5 Ng4 8. exd6 exd6 9. Bb5+ Nc6 10. Nd4 Qe7+ 11. Nce2 Bxd4 12. Qxd4 0-0 13. h3 Nxd4 14. hxg4 a6 15. Bh6 axb5 16. Bxf8 Qxe2# 0-1

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "8"]
[White "Obando Alzate, Mathias"]
[Black "Viasus Cuellar, Juan Diego"]
[Result "0-1"]
[ECO "B34"]
[WhiteElo "1370"]
[BlackElo "1766"]
[PlyCount "78"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Nf3 Nf6 7. Bd3 0-0 8. 0-0 d5 9. Re1 Bg4 10. h3 Bxf3 11. Qxf3 d4 12. Nd5 Nxd5 13. exd5 Ne5 14. Qe4 Nxd3 15. Qxd3 Qxd5 16. Rxe7 Rfe8 17. Rxe8+ Rxe8 18. Bf4 Qe4 19. Qxe4 Rxe4 20. Bd2 Re2 21. Rd1 Re6 22. b3 Rc6 23. Rc1 f5 24. f4 Kf7 25. Kf2 Ke6 26. Kf3 Kd5 27. Ke2 Bf8 28. c3 dxc3 29. Bxc3 Ke4 30. g3 Bb4 31. Bd2 Bxd2 32. Kxd2 Rxc1 33. Kxc1 Kf3 34. Kd2 Kxg3 35. Ke3 Kxh3 36. Kd4 Kg4 37. Ke5 h5 38. Kf6 h4 39. Kxg6 h3 0-1

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "9"]
[White "Parra Pino, Jesus David"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "1569"]
[BlackElo "1370"]
[PlyCount "69"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nc6 5. Be2 Nf6 6. 0-0 Be6 7. Nc3 Bd6 8. h3 0-0 9. Re1 Re8 10. Bd3 Qd7 11. Ng5 h6 12. Nxe6 Rxe6 13. Ne2 Rae8 14. c3 Nd8 15. Be3 b6 16. Bf5 Qb5 17. Bxe6 Rxe6 18. Qb3 Qe8 19. Qd1 Rxe3 20. fxe3 Qxe3+ 21. Kh1 Ne4 22. Rf1 Nf2+ 23. Rxf2 Qxf2 24. Qf1 Qe3 25. Qf3 Qe6 26. Nf4 Bxf4 27. Qxf4 Nc6 28. Qxc7 Kh7 29. Qg3 Qe2 30. Rb1 Na5 31. Qe1 Qh5 32. Qd1 Nc4 33. Qxh5 g6 34. Qxd5 Nd2 35. Rd1 1-0

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "5"]
[White "Ricardo Santofimio, Angel"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "B40"]
[WhiteElo "1632"]
[BlackElo "1370"]
[PlyCount "113"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. exd5 exd5 4. g3 c5 5. Bg2 Nc6 6. 0-0 Qb6 7. b3 Nge7 8. Bb2 Be6 9. Nc3 d4 10. Ne2 Nf5 11. c3 Rd8 12. cxd4 cxd4 13. Ng5 d3 14. Nxe6 dxe2 15. Qxe2 fxe6 16. Qxe6+ Nfe7 17. Bf3 Rxd2 18. Bh5+ g6 19. Bxh8 Nd4 20. Qxb6 axb6 21. Bxd4 Rxd4 22. Bf3 Bg7 23. Rad1 Nc6 24. Rxd4 Bxd4 25. Bxc6+ bxc6 26. Rd1 c5 27. Re1+ Kf7 28. h4 h6 29. Kg2 Kg7 30. Re7+ Kf6 31. Rb7 Kf5 32. Rxb6 g5 33. hxg5 hxg5 34. Rb8 Kg4 35. f3+ Kh5 36. b4 c4 37. Rd8 Be3 38. g4+ Kg6 39. Rc8 c3 40. Rxc3 Bd4 41. Rc6+ Kf7 42. b5 Ke7 43. Rc1 Kd6 44. Rd1 Kd5 45. b6 Kc6 46. Rxd4 Kxb6 47. a4 Ka5 48. Kg3 Ka6 49. f4 gxf4+ 50. Kxf4 Ka5 51. g5 Kb6 52. g6 Kc5 53. g7 Kb6 54. Ke5 Ka5 55. g8Q Ka6 56. Qb8 Ka5 57. Rd6 1-0

[Event "COL-ch U16"]
[Site "Florencia Caqueta"]
[Date "2024.10.06"]
[Round "7"]
[White "Saravia Delgadillo, Sara Sofia"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "1538"]
[BlackElo "1370"]
[PlyCount "49"]
[EventDate "2024.10.06"]
[EventType "swiss (blitz)"]
[EventRounds "9"]
[EventCountry "COL"]
[SourceTitle "CB44_2024"]
[Source "Chessbase"]
[SourceDate "2024.10.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.10.30"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. exd5 exd5 4. d4 c5 5. Bb5+ Nc6 6. 0-0 Bd7 7. Nc3 Nge7 8. dxc5 Nf5 9. Qxd5 a6 10. Bxc6 bxc6 11. Re1+ Ne7 12. Qe4 Qa5 13. Be3 Rb8 14. Rab1 Qc7 15. Bf4 f5 16. Qxe7+ Bxe7 17. Bxc7 Rb7 18. Bd6 Bc8 19. Na4 Kf7 20. Ne5+ Ke8 21. Nxc6 Kd7 22. Nxe7 Re8 23. Rbd1 Rb4 24. Nb6+ Kd8 25. Bb8+ 1-0

[Event "COL-ch U18"]
[Site "Ibague"]
[Date "2024.03.17"]
[Round "7"]
[White "Obando Alzate, Mathias"]
[Black "Galeano Reyes, Juan Esteban"]
[Result "0-1"]
[ECO "B30"]
[WhiteElo "1400"]
[BlackElo "1555"]
[PlyCount "88"]
[EventDate "2024.03.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 219 Extra"]
[Source "ChessBase"]
[SourceDate "2024.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.05.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bc4 e6 4. d4 d5 5. exd5 exd5 6. Be2 Nf6 7. c4 dxc4 8. Bxc4 Nxd4 9. Nxd4 Qxd4 10. Qe2+ Qe4 11. 0-0 Qxe2 12. Bxe2 Bd6 13. Nc3 a6 14. Re1 0-0 15. Be3 b5 16. Rad1 Be7 17. Bf3 Ra7 18. b4 Rc7 19. bxc5 Bxc5 20. Bxc5 Rxc5 21. Ne4 Nxe4 22. Rxe4 Be6 23. a4 Rfc8 24. Red4 g6 25. a5 Rc4 26. Rd6 Rc1 27. h3 Rxd1+ 28. Rxd1 Rc4 29. Rd6 Kg7 30. Bd1 Rc1 31. Kh2 Ra1 32. Rb6 Rxa5 33. Rc6 Bc4 34. h4 Ra1 35. Bc2 Ra2 36. Be4 Rxf2 37. Rb6 a5 38. Bc6 Rb2 39. Kg3 a4 40. Kf3 a3 41. Ke3 b4 42. Kd4 Be6 43. Kd3 a2 44. Ra6 Rb1 0-1

[Event "COL-ch U18"]
[Site "Ibague"]
[Date "2024.03.17"]
[Round "6"]
[White "Obando Alzate, Mathias"]
[Black "Ortiz, Jonathan David"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1400"]
[PlyCount "23"]
[EventDate "2024.03.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 219 Extra"]
[Source "ChessBase"]
[SourceDate "2024.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.05.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Nc3 Nf6 5. d3 0-0 6. Bg5 Nd4 7. Nd5 c6 8. Nxf6+ gxf6 9. Bh6 Re8 10. Nxd4 Bxd4 11. Qg4+ Kh8 12. Qg7# 1-0

[Event "COL-ch U18"]
[Site "Ibague"]
[Date "2024.03.16"]
[Round "5"]
[White "Cuellar Sanchez, Matias"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C56"]
[WhiteElo "1570"]
[BlackElo "1400"]
[PlyCount "33"]
[EventDate "2024.03.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 219 Extra"]
[Source "ChessBase"]
[SourceDate "2024.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.05.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. e5 d5 6. Bb5 a6 7. Bxc6+ bxc6 8. exf6 Qxf6 9. Qe2+ Be6 10. 0-0 Bd6 11. Re1 0-0 12. c3 d3 13. Qxd3 Bf5 14. Qd4 Qg6 15. Bf4 Rad8 16. Bxd6 Rxd6 17. Nh4 1-0

[Event "COL-ch U18"]
[Site "Ibague"]
[Date "2024.03.16"]
[Round "4"]
[White "Obando Alzate, Mathias"]
[Black "Carvajal, Juan Andres"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "1400"]
[PlyCount "93"]
[EventDate "2024.03.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 219 Extra"]
[Source "ChessBase"]
[SourceDate "2024.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.05.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 h6 4. Nc3 Nf6 5. d3 Bb4 6. Bd2 d6 7. a3 Bxc3 8. bxc3 0-0 9. h3 Be6 10. Bb3 d5 11. exd5 Bxd5 12. 0-0 Bxb3 13. cxb3 Qxd3 14. Re1 e4 15. Re3 Qd5 16. c4 Qd6 17. Ne1 Rad8 18. Ra2 Rfe8 19. b4 Qe6 20. Qc1 a6 21. f3 Qd6 22. Qc3 Qd4 23. Qxd4 Rxd4 24. c5 exf3 25. Rxe8+ Nxe8 26. Nxf3 Rd7 27. Bc3 b6 28. Re2 Nf6 29. cxb6 cxb6 30. Bxf6 gxf6 31. Re8+ Kg7 32. Ra8 a5 33. b5 Nd4 34. Ne1 Nxb5 35. a4 Nc3 36. Nf3 Nxa4 37. Nh4 Rd5 38. g4 Rg5 39. Nf5+ Kh7 40. h4 Rxg4+ 41. Kh2 Rf4 42. Nd6 Rxh4+ 43. Kg3 Rh5 44. Nxf7 Kg6 45. Ra7 b5 46. Kf4 b4 47. Nh8# 1-0

[Event "COL-ch U18"]
[Site "Ibague"]
[Date "2024.03.15"]
[Round "3"]
[White "Moreno Palacios, Alejandro"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C56"]
[WhiteElo "1572"]
[BlackElo "1400"]
[PlyCount "73"]
[EventDate "2024.03.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 219 Extra"]
[Source "ChessBase"]
[SourceDate "2024.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.05.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 d6 5. dxe5 dxe5 6. Qxd8+ Nxd8 7. Nxe5 Nxe4 8. 0-0 Bc5 9. Be3 Bb6 10. Bxb6 axb6 11. Re1 Bf5 12. g4 Nd6 13. gxf5 Nxf5 14. Nxf7+ Kf8 15. Nxh8 Nd4 16. Na3 Nf3+ 17. Kf1 Nxe1 18. Rxe1 Nc6 19. Nb5 Nb4 20. Nxc7 Rc8 21. Ne6+ Kg8 22. Nd8+ Kf8 23. Ne6+ Kg8 24. Bb3 Kxh8 25. Nc7 Rf8 26. Re8 Rxe8 27. Nxe8 Nc6 28. Nd6 Nd8 29. Bd5 h6 30. Nxb7 Nxb7 31. Bxb7 Kh7 32. b4 g5 33. a4 h5 34. a5 h4 35. a6 Kh6 36. a7 Kh5 37. a8Q 1-0

[Event "COL-ch U18"]
[Site "Ibague"]
[Date "2024.03.15"]
[Round "2"]
[White "Obando Alzate, Mathias"]
[Black "Contreras Gonzalez, Cristian David"]
[Result "0-1"]
[ECO "B02"]
[WhiteElo "1400"]
[BlackElo "1558"]
[PlyCount "56"]
[EventDate "2024.03.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 219 Extra"]
[Source "ChessBase"]
[SourceDate "2024.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.05.31"]
[SourceQuality "1"]

1. e4 Nf6 2. Nc3 d5 3. e5 d4 4. exf6 dxc3 5. bxc3 gxf6 6. Bc4 Nc6 7. d3 h5 8. Nf3 e5 9. d4 Bg7 10. d5 Na5 11. Bb3 Bf5 12. 0-0 Qd6 13. Be3 b6 14. Qe2 0-0-0 15. Rab1 Bg4 16. Ba4 e4 17. Qa6+ Kb8 18. Nd4 Qxd5 19. Rb5 Bc8 20. Qxa5 Qb7 21. Qb4 c5 22. Qc4 cxd4 23. cxd4 Be6 24. Qb4 h4 25. Bf4+ Ka8 26. c3 h3 27. g3 e3 28. Bxe3 Qg2# 0-1

[Event "COL-ch U18"]
[Site "Ibague"]
[Date "2024.03.14"]
[Round "1"]
[White "Guzman Galeano, Erick Samir"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "1756"]
[BlackElo "1400"]
[PlyCount "51"]
[EventDate "2024.03.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "COL"]
[SourceTitle "CBM 219 Extra"]
[Source "ChessBase"]
[SourceDate "2024.05.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.05.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bc4 Bc5 5. d3 h6 6. Be3 Bb6 7. Qd2 d6 8. h3 Be6 9. 0-0-0 Qd7 10. Rhe1 0-0-0 11. Bxb6 axb6 12. Bb5 Qe8 13. d4 exd4 14. Nxd4 Bd7 15. Nb3 Nb8 16. a4 Bc6 17. Nd4 Nfd7 18. Nd5 Nc5 19. b4 Nxe4 20. Qf4 Qe5 21. Qxe5 dxe5 22. Ne7+ Kd7 23. Ndxc6+ Ke6 24. Nxd8+ Kxe7 25. Rxe4 f6 26. Nxb7 1-0

[Event "Pereira op"]
[Site "Pereira"]
[Date "2023.09.24"]
[Round "4"]
[White "Moreno Palacios, Alejandro"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C54"]
[WhiteElo "1339"]
[BlackElo "1451"]
[PlyCount "46"]
[EventDate "2023.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Be7 7. e5 Bb4+ 8. Nc3 Qe7 9. 0-0 Ng8 10. a3 Bxc3 11. bxc3 d6 12. exd6 Qxd6 13. Ng5 Nd8 14. Qb3 Qe7 15. Bd2 Qf6 16. Rfe1+ Ne7 17. Qb4 Be6 18. Nxe6 Nxe6 19. d5 a5 20. Qb5+ c6 21. Qxb7 Rd8 22. dxc6 Rxd2 23. c7 0-0 1-0

[Event "Pereira op"]
[Site "Pereira"]
[Date "2023.09.24"]
[Round "6"]
[White "Obando Alzate, Mathias"]
[Black "Huertas Cabrera, Daniel"]
[Result "0-1"]
[ECO "C00"]
[WhiteElo "1451"]
[BlackElo "1367"]
[PlyCount "60"]
[EventDate "2023.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. d3 dxe4 4. Nfd2 exd3 5. Bxd3 Nf6 6. 0-0 Be7 7. Nc3 0-0 8. Nf3 Nc6 9. Bf4 Re8 10. Qd2 Bd6 11. Rfe1 e5 12. Bg5 Be6 13. Ne4 Nxe4 14. Bxe4 Qd7 15. Qd3 f5 16. Bxc6 Qxc6 17. Nxe5 Bxe5 18. Rxe5 Bxa2 19. Rxf5 Qe4 20. Rf8+ Kxf8 21. Qa3+ c5 22. Be3 Bf7 23. Re1 Qxc2 24. Bxc5+ Kg8 25. Qa1 Rxe1+ 26. Qxe1 Qxc5 27. h3 Re8 28. Qf1 Qb4 29. Kh2 Re1 30. Qh1 Qf4+ 0-1

[Event "Pereira op"]
[Site "Pereira"]
[Date "2023.09.24"]
[Round "5"]
[White "Obando Alzate, Mathias"]
[Black "Munera Garcia, Lina Marcela"]
[Result "0-1"]
[ECO "B30"]
[WhiteElo "1451"]
[BlackElo "1095"]
[PlyCount "50"]
[EventDate "2023.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. Bc4 Bg7 4. Nc3 Nc6 5. d3 a6 6. Bf4 e5 7. Bg3 b5 8. Bd5 Nge7 9. 0-0 Bb7 10. Ng5 Nxd5 11. exd5 Qxg5 12. dxc6 Bxc6 13. Qe2 d6 14. Ne4 Qd8 15. c3 0-0 16. d4 exd4 17. cxd4 Re8 18. f3 d5 19. Qd3 dxe4 20. fxe4 Bxd4+ 21. Kh1 Bxe4 22. Qd2 Qd5 23. Rae1 Qc6 24. Rf4 b4 25. Qe2 Bd5 0-1

[Event "Pereira op"]
[Site "Pereira"]
[Date "2023.09.23"]
[Round "2"]
[White "Obando Alzate, Mathias"]
[Black "Chica Londono, Daniel"]
[Result "0-1"]
[ECO "B11"]
[WhiteElo "1451"]
[BlackElo "1358"]
[PlyCount "46"]
[EventDate "2023.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 c6 2. Nf3 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nc3 Bg4 6. Bc4 e6 7. d3 Be7 8. Bf4 0-0 9. Qd2 Nbd7 10. 0-0-0 Nb6 11. Qe3 Nbd5 12. Bxd5 Nxd5 13. Qd4 Bf6 14. Be5 Bxe5 15. Qxe5 Nxc3 16. Qxc3 Bxf3 17. gxf3 Qd5 18. Rhg1 g6 19. Rg3 Qxa2 20. Qb4 b5 21. Qe4 Qd5 22. Qb4 Rfd8 23. Rh3 h5 0-1

[Event "Pereira op"]
[Site "Pereira"]
[Date "2023.09.23"]
[Round "1"]
[White "Quevedo Bonilla, Paula Thaliana"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C66"]
[WhiteElo "1512"]
[BlackElo "1451"]
[PlyCount "49"]
[EventDate "2023.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. 0-0 Nf6 6. Nc3 a6 7. Bxc6 Bxc6 8. dxe5 dxe5 9. Nxe5 Nxe4 10. Qxd8+ Rxd8 11. Nxc6 Nd2 12. Re1+ Be7 13. Nxd8 Kxd8 14. Bxd2 Bb4 15. Rad1 Kc8 16. Ne4 Be7 17. Ng5 Re8 18. Bb4 Kb8 19. Rxe7 Rc8 20. Nxf7 c5 21. Rdd7 Rc6 22. Rxb7+ Ka8 23. Rbd7 cxb4 24. Rd8+ Rc8 25. Rxc8# 1-0

[Event "Pereira op"]
[Site "Pereira"]
[Date "2023.09.23"]
[Round "3"]
[White "Villada Londono, Thomas"]
[Black "Obando Alzate, Mathias"]
[Result "1-0"]
[ECO "C47"]
[WhiteElo "1234"]
[BlackElo "1451"]
[PlyCount "37"]
[EventDate "2023.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "COL"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 d6 5. dxe5 dxe5 6. Qxd8+ Nxd8 7. Nxe5 Bd6 8. Nf3 Bc5 9. Bc4 Be6 10. Bb3 Nc6 11. Nb5 0-0 12. Bxe6 fxe6 13. Nxc7 Rac8 14. Nxe6 Rce8 15. Nxc5 Nxe4 16. Nxe4 Rxe4+ 17. Be3 Nb4 18. 0-0 Nxc2 19. Rac1 1-0

