[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "2.159"] [White "Simons-Rudolph, Aedan"] [Black "Castillo, Osiel"] [Result "1-0"] [ECO "A43"] [Opening "Old Benoni defence"] [EventDate "2021.09.26"] [WhiteTeam "Appalachian State University"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. d4 c5 2. d5 Qa5+ 3. Bd2 Qb6 4. b3 Nf6 5. Nc3 g6 6. Bf4 d6 7. e3 Bg7 8. Bd3 Nh5 9. Bg3 Nxg3 10. hxg3 Bxc3+ 11. Kf1 Bxa1 12. Qxa1 O-O 13. Qb1 Nd7 14. c4 Ne5 15. Bc2 e6 16. f4 Ng4 17. Ke2 exd5 18. cxd5 Qb5+ 19. Bd3 Bf5 20. Nf3 Bxd3+ 21. Qxd3 Qxd3+ 22. Kxd3 Rae8 23. Re1 Re7 24. e4 Rfe8 25. Ng5 h6 26. Nf3 f5 27. Nd2 fxe4+ 28. Nxe4 Nf2+ 29. Nxf2 Rxe1 30. Ng4 R1e2 31. Nf6+ Kf7 32. Nxe8 Kxe8 33. Kxe2 Ke7 34. Ke3 Kf6 35. Ke4 b5 36. g4 a5 37. Kd3 g5 38. fxg5+ hxg5 39. Ke4 a4 40. bxa4 bxa4 41. a3 Kg6 42. Kd3 Kf6 43. Ke4 Kg6 44. Kd3 Kf7 45. Ke4 Kf6 46. Kd3 Ke5 47. Kc4 Kf4 48. Kb5 Kxg4 49. Kc6 Kg3 50. Kxd6 Kxg2 51. Kxc5 g4 52. d6 g3 53. d7 Kh2 54. d8=Q g2 55. Qh4+ Kg1 56. Kd4 Kf1 57. Qf4+ Kg1 58. Ke3 Kh1 59. Qh4+ Kg1 60. Qf2+ Kh1 61. Kf3 g1=Q 62. Qh4+ Qh2 63. Qxa4 Qh3+ 64. Ke2 Qh2+ 65. Kd1 Qh5+ 66. Kc2 Qe2+ 67. Kc3 Qe3+ 68. Kb2 Qe5+ 69. Kb3 Qe3+ 70. Kb4 Qb6+ 71. Qb5 Qd4+ 72. Ka5 Qb6+ 73. Qxb6 Kg2 74. Kb4 Kf3 75. Kc3 Ke4 76. Qd6 Kf5 77. Kd4 Kg4 1-0

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "12.144"] [White "Groff, Jordan"] [Black "Castillo, Osiel"] [Result "1-0"] [WhiteElo "1699"] [ECO "A04"] [Opening "Reti opening"] [EventDate "2021.09.26"] [WhiteFideId "30971730"] [WhiteTeam "Connecticut College"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. Nf3 c5 2. b3 Nc6 3. Bb2 Nf6 4. e3 d5 5. Bb5 Bd7 6. c4 a6 7. Bxc6 Bxc6 8. cxd5 Bxd5 9. Nc3 Bc6 10. O-O g6 11. d3 Bg7 12. Qe2 O-O 13. Ne5 Qd6 14. Nxc6 Qxc6 15. Rac1 b6 16. Rfd1 Rad8 17. h3 a5 18. a4 Rd7 19. Nb5 Rfd8 20. d4 Qd5 21. Qc4 Qxc4 22. bxc4 cxd4 23. exd4 Ne4 24. Ba3 e6 25. d5 exd5 26. cxd5 Bf8 27. Bxf8 Kxf8 28. Rc6 Rxd5 29. Rxd5 Rxd5 30. Rxb6 Rd1+ 31. Kh2 Nxf2 32. Ra6 Rh1+ 33. Kg3 Ne4+ 34. Kf4 Nd2 35. Rxa5 Rf1+ 36. Kg3 Ne4+ 37. Kh2 Ra1 38. Ra7 f5 39. Nd4 h5 40. Ne6+ Ke8 41. Nf4 Nc5 42. a5 g5 43. Nxh5 Ra2 44. Ng7+ Kd8 45. Nxf5 Ne4 46. Nh6 Kc8 47. Nf7 Kb8 48. Re7 Rxa5 49. Rxe4 Kc7 50. Rg4 Kd7 51. Nxg5 Ke7 52. Nf3 Kf6 53. h4 Ra3 54. Kg3 Kf5 55. h5 Ra6 56. Rh4 Rh6 57. Kh3 Kf6 58. g4 Ke6 59. g5 Rh7 60. h6 Rf7 61. Kg3 Kf5 62. h7 Rf8 63. h8=Q Rxh8 64. Rxh8 Ke4 65. g6 Ke3 66. g7 1-0

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "11.148"] [White "Castillo, Osiel"] [Black "Stewart, Nicholas"] [Result "1/2-1/2"] [ECO "B10"] [Opening "Caro-Kann"] [Variation "closed (Breyer) variation"] [EventDate "2021.09.26"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "Appalachian State University"] 1. e4 c6 2. d3 d5 3. f4 e6 4. Nf3 Ne7 5. b3 g6 6. Bb2 Rg8 7. exd5 Nxd5 8. Qe2 Nxf4 9. Qe4 Nd5 10. c4 Nc7 11. Nbd2 Bg7 12. Bxg7 Rxg7 13. Be2 f5 14. Qe3 Nd7 15. Ne5 Nxe5 16. Qxe5 Kf8 17. O-O Rf7 18. Nf3 Qf6 19. d4 Qd8 20. Qh8+ Ke7 21. Qxd8+ Kxd8 22. Ng5 Rd7 23. Rad1 Ne8 24. Nxe6+ Ke7 25. Nc5 Rd8 26. Rfe1 Kf6 27. Bf3 b6 28. Nd3 Bb7 29. Nf4 Rab8 30. Re6+ Kf7 31. Rde1 Rxd4 32. Re7+ Kf8 33. Rxh7 Rxf4 34. Rh8+ Kf7 35. Rh6 c5 36. Kf2 Bxf3 37. gxf3 Rd4 38. Rh7+ Kf6 39. Rxa7 Rd2+ 40. Re2 Rxe2+ 41. Kxe2 Nd6 42. a4 Re8+ 43. Kd3 Kg5 44. Ra6 Nc8 45. Ra8 Kh4 46. Rb8 Kh3 47. Rb7 Kxh2 48. Rh7+ Kg3 49. Rg7 Kxf3 50. Rxg6 Re3+ 51. Kc2 f4 52. Rg8 Nd6 53. Rg6 Ne4 54. Rxb6 Kg2 55. Rf6 f3 56. a5 f2 57. a6 f1=Q 58. Rxf1 Kxf1 59. a7 Re2+ 60. Kd3 Nf2+ 61. Kc3 Nd1+ 62. Kd3 Nf2+ 63. Kc3 Nd1+ 64. Kd3 Nf2+ 1/2-1/2

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "10.141"] [White "Besa, Masaiti"] [Black "Castillo, Osiel"] [Result "1-0"] [WhiteTitle "WFM"] [WhiteElo "1708"] [ECO "A43"] [Opening "Old Benoni defence"] [EventDate "2021.09.26"] [WhiteFideId "11310570"] [WhiteTeam "Texas Tech University"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. d4 c5 2. d5 g6 3. c4 Bg7 4. Nc3 b6 5. e4 d6 6. Bd3 Nd7 7. Nge2 Ne5 8. O-O Ba6 9. b3 Nxd3 10. Qxd3 b5 11. cxb5 Bb7 12. a4 a6 13. Rb1 axb5 14. Nxb5 Ba6 15. Bb2 Bxb2 16. Rxb2 Nf6 17. Nec3 O-O 18. Re1 Re8 19. Qg3 Qa5 20. Qe3 Reb8 21. Rbb1 Nd7 22. f4 Bxb5 23. Nxb5 Qb4 24. Rec1 Rxb5 25. axb5 Qxb5 26. Ra1 Rb8 27. Rab1 Nf6 28. Rd1 Qb4 29. e5 dxe5 30. fxe5 Nd7 31. Rf1 Qd4 32. Qxd4 cxd4 33. e6 fxe6 34. dxe6 Nc5 35. b4 Nxe6 36. Rbe1 Rb6 37. Rd1 Rxb4 38. Rfe1 Nc5 39. Rxe7 d3 40. Re3 Rb3 41. Rd2 Kf7 42. g3 Kf6 43. Kg2 g5 44. Kf3 h5 45. h3 Kf5 46. g4+ hxg4+ 47. hxg4+ Kf6 48. Kg3 Ne6 49. Rdxd3 Rxd3 50. Rxd3 Nf4 51. Rd6+ Ke5 52. Rd8 Ne2+ 53. Kf3 Ng1+ 54. Kg2 Nh3 55. Kg3 Ng1 56. Re8+ Kf6 57. Kg2 Kf7 58. Re1 Nf3 59. Kxf3 Kf6 60. Ke4 Kg6 61. Rh1 Kf6 62. Rh3 Kg7 63. Rh5 Kg6 64. Ke5 Kf7 65. Rxg5 Ke7 66. Rf5 Kd7 67. g5 Kc6 68. g6 Kc5 69. g7 Kc4 70. g8=Q+ Kc3 1-0

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "9.134"] [White "Castillo, Osiel"] [Black "Derakhshani, D"] [Result "0-1"] [BlackTitle "IM"] [BlackElo "2270"] [ECO "C44"] [Opening "Scotch gambit"] [EventDate "2021.09.26"] [BlackFideId "12500330"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "Saint Louis University"] 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. c3 Nf6 6. O-O Nxe4 7. Re1 d5 8. cxd4 Bb4 9. Nc3 Bxc3 10. bxc3 O-O 11. Bb3 Nxc3 12. Qd3 Ne4 13. Ba3 Re8 14. Bc2 Bf5 15. h3 Qf6 16. Qb3 Nxd4 17. Nxd4 Qxd4 18. Bb2 Qxf2+ 19. Kh1 Ng3+ 20. Kh2 Rxe1 21. Rxe1 Qxe1 22. Bxf5 Nf1+ 23. Kg1 Nd2+ 24. Kh2 Nxb3 25. axb3 Re8 26. Bd4 Re2 27. Bg4 Rc2 28. Bf3 c5 29. Bg1 Rc1 0-1

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "8.140"] [White "Bortolussi, Francesco"] [Black "Castillo, Osiel"] [Result "0-1"] [WhiteElo "1779"] [ECO "A43"] [Opening "Old Benoni defence"] [EventDate "2021.09.26"] [WhiteFideId "861596"] [WhiteTeam "Texas Tech University"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. d4 c5 2. e3 cxd4 3. exd4 d5 4. Nf3 Nc6 5. c4 e6 6. Nc3 g6 7. Bg5 Be7 8. Bf4 g5 9. Bg3 g4 10. Ne5 Nxe5 11. Bxe5 f6 12. Bg3 h5 13. cxd5 exd5 14. Bd3 f5 15. Be5 Nf6 16. O-O h4 17. Re1 Kf7 18. Qb3 b6 19. Nxd5 Be6 20. Bxf6 Bxf6 21. Bc4 Rc8 22. Rxe6 Rxc4 23. Qxc4 Kxe6 24. Re1+ Kf7 25. Nxf6+ Kxf6 26. Qe6+ Kg5 27. d5 Rh6 28. Qe7+ Qxe7 29. Rxe7 Rd6 30. Rxa7 Rxd5 31. f4+ gxf3 32. gxf3 Rd1+ 33. Kf2 Rd2+ 34. Ke3 Rxh2 35. b3 Rb2 36. Ra6 h3 37. Rxb6 h2 38. Rb7 h1=Q 39. Rg7+ Kf6 0-1

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "7.152"] [White "Castillo, Osiel"] [Black "Zhang, Bowen"] [Result "1-0"] [ECO "B10"] [Opening "Caro-Kann defence"] [EventDate "2021.09.26"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "New York University"] 1. e4 c6 2. f4 d5 3. exd5 cxd5 4. Nf3 Nf6 5. b3 Bg4 6. Be2 e6 7. h3 Bxf3 8. Bxf3 Bd6 9. g3 Nc6 10. Bb2 O-O 11. Nc3 Qb6 12. Qe2 Nd4 13. Qd3 Nf5 14. a4 Nxg3 15. O-O-O Bxf4 16. Rhg1 Nf5 17. Nb5 e5 18. Qxf5 g6 19. Bxe5 Bxe5 20. Qxe5 Rfe8 21. Qd6 Qf2 22. Rdf1 Qh4 23. Bxd5 Nxd5 24. Qxd5 Rad8 25. Qxf7+ Kh8 26. Qf6+ Qxf6 27. Rxf6 Re2 28. d3 Rc8 29. c4 Re3 30. Kc2 Rd8 31. Rd1 Rxh3 32. Nxa7 Kg7 33. Rb6 Rh2+ 34. Rd2 Rh3 35. Rxb7+ Kh6 36. Nc6 Rd6 37. Ne5 Re6 38. Ng4+ Kg5 39. Nf2 Rf3 40. Ne4+ Kh6 41. Rh2+ 1-0

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "6.155"] [White "Swisher, Jacob"] [Black "Castillo, Osiel"] [Result "0-1"] [ECO "B54"] [Opening "Sicilian"] [EventDate "2021.09.26"] [WhiteTeam "Appalachian State University"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 a6 5. Be2 g6 6. O-O Bg7 7. Be3 Nc6 8. Nc3 Nf6 9. Qd2 O-O 10. Nxc6 bxc6 11. Bh6 c5 12. Bxg7 Kxg7 13. h4 Be6 14. h5 Ng8 15. hxg6 fxg6 16. f4 Qd7 17. Rf3 Bg4 18. Rf2 Rf6 19. Raf1 Raf8 20. Nd5 R6f7 21. Qc3+ Nf6 22. f5 Bxe2 23. Rxe2 Kg8 24. fxg6 hxg6 25. Ref2 Nxe4 26. Rxf7 Rxf7 27. Qe3 Rxf1+ 28. Kxf1 Qf5+ 29. Kg1 Qxd5 30. Qh6 Qd1+ 31. Kh2 Qh5+ 32. Qxh5 gxh5 33. Kh3 Kg7 34. Kh4 Kg6 35. g4 hxg4 36. Kxg4 e5 37. Kf3 d5 38. Ke3 Kf5 39. b3 a5 40. Kd3 Kf4 41. Ke2 Nc3+ 42. Kd3 Nxa2 43. c3 Nb4+ 44. cxb4 axb4 45. Kd2 Ke4 46. Ke2 Kd4 47. Kd2 e4 48. Kc2 e3 49. Kd1 Kc3 50. Ke2 Kxb3 51. Kxe3 c4 52. Kd2 c3+ 53. Kc1 d4 54. Kb1 d3 55. Ka1 d2 56. Kb1 d1=Q# 0-1

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "5.151"] [White "Castillo, Osiel"] [Black "Gruen, Angus"] [Result "0-1"] [ECO "C44"] [Opening "Scotch gambit"] [Variation "Benima defence"] [EventDate "2021.09.26"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "California Institute of Technology"] 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Be7 5. Nxd4 Nf6 6. e5 Nxe5 7. O-O Nxc4 8. Re1 O-O 9. Qd3 d5 10. b3 Nb6 11. Qg3 Ne4 12. Rxe4 dxe4 13. Bh6 Qxd4 14. h3 Qxa1 15. Kh2 Bd6 16. f4 exf3 17. Bf4 Bxf4 18. Qxf4 Qxb1 19. Qxf3 Qxc2 20. a4 Bf5 21. a5 Be4 22. Qg4 Nd5 23. b4 Ne3 24. Qf4 Nxg2 25. Qxc7 Nf4+ 26. Kg3 0-1

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "4.137"] [White "Eliezer, Segev"] [Black "Castillo, Osiel"] [Result "1-0"] [WhiteElo "2004"] [ECO "A43"] [Opening "Old Benoni defence"] [EventDate "2021.09.26"] [WhiteFideId "2074087"] [WhiteTeam "University of Texas at Dallas"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. d4 c5 2. d5 g6 3. c4 Bg7 4. e4 b5 5. cxb5 a6 6. Nc3 Bxc3+ 7. bxc3 axb5 8. Nf3 c4 9. Be2 d6 10. Qc2 Nd7 11. O-O Ngf6 12. Bh6 Ng4 13. Bg7 Rg8 14. Bd4 Bb7 15. a4 e5 16. dxe6 fxe6 17. axb5 e5 18. Rxa8 Qxa8 19. Bxc4 Bxe4 20. Qe2 Rf8 21. Ng5 Bxg2 22. Qxg4 Bxf1 23. Qe6+ Kd8 24. Bxf1 exd4 25. Nf7+ Kc7 26. Qxd6+ Kc8 27. Qe6 Qf3 28. Qc4+ Kb8 29. Qxd4 Qxf7 30. Qd6+ Kc8 31. Qd4 Kd8 32. b6 Qg7 33. Qxg7 Ke8 34. b7 Rf7 35. Qg8+ Rf8 36. Qe6+ Kd8 37. Bh3 Rf6 38. Qxd7# 1-0

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "3.152"] [White "Castillo, Osiel"] [Black "Solodukhina, Ana"] [Result "1-0"] [ECO "B21"] [Opening "Sicilian"] [Variation "Grand Prix attack"] [EventDate "2021.09.26"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "Texas Tech University"] 1. e4 c5 2. f4 d6 3. Nf3 Nf6 4. e5 dxe5 5. fxe5 Ng8 6. b3 Nc6 7. Bb2 g6 8. e6 Nf6 9. exf7+ Kxf7 10. Bc4+ e6 11. O-O Bg7 12. Ng5+ Ke8 13. Bxe6 Nd4 14. Bxc8 Rxc8 15. Qe1+ Kf8 16. Ne6+ Nxe6 17. Qxe6 Rc6 18. Qc4 Qe7 19. Nc3 Bh6 20. Nd5 Qd8 21. Bxf6 Rxf6 22. Rxf6+ Kg7 23. Raf1 Bxd2 24. Rf7+ Kh6 25. Qg4 Qxd5 26. Rd1 Be3+ 27. Kh1 Qxf7 28. Qh3+ Kg5 29. Qxe3+ Kh5 30. g4+ Kh4 31. Qg3+ Kg5 32. h4+ Kh6 33. g5+ Kg7 34. Qe5+ 1-0

[Event "US On/L Collegiate Blitz"] [Site "lichess.org INT"] [Date "2021.09.26"] [Round "1.130"] [White "Castillo, Osiel"] [Black "Escalante Ramirez, Brian Sebasti"] [Result "0-1"] [BlackTitle "IM"] [BlackElo "2454"] [ECO "C00"] [Opening "French defence"] [EventDate "2021.09.26"] [BlackFideId "3819566"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "University of Texas at Dallas"] 1. e4 e6 2. d4 d5 3. Nf3 dxe4 4. Ne5 Nd7 5. Nc3 Bb4 6. Nxd7 Qxd7 7. a3 Bxc3+ 8. bxc3 f5 9. Be2 Nf6 10. O-O O-O 11. a4 b6 12. Ba3 Rd8 13. Bb5 c6 14. Bc4 Nd5 15. Qd2 h6 16. f3 e3 17. Qe2 Nxc3 18. Qxe3 Qxd4 19. Qxd4 Rxd4 20. Bb3 Nd5 21. Bb2 Rb4 22. c3 Rxb3 0-1

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "1.131"] [White "Escalante Ramirez, Brian Sebasti"] [Black "Castillo, Osiel"] [Result "1-0"] [WhiteTitle "IM"] [WhiteElo "2454"] [ECO "B50"] [Opening "Sicilian"] [EventDate "2021.09.25"] [WhiteFideId "3819566"] [WhiteTeam "University of Texas at Dallas"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. e4 c5 2. Nf3 d6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 g6 6. Be3 Bg7 7. Qd2 Qb6 8. Nf5 Qxb2 9. Nxg7+ Kf8 10. Rb1 Qa3 11. Rb3 Qa5 12. Bh6 Nxh6 13. Qxh6 Kg8 14. Ne8 Qe5 15. Bd3 Be6 16. f4 Qa5 17. Qg7# 1-0

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "9.162"] [White "Castillo, Osiel"] [Black "Walat, Jason"] [Result "1-0"] [ECO "C41"] [Opening "Philidor"] [Variation "exchange variation"] [EventDate "2021.09.25"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "Drexel University"] 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Bc4 Qe7 5. O-O Be6 6. Bb3 Bxb3 7. axb3 Nf6 8. Nxd4 Nxe4 9. f3 Nf6 10. Re1 Ne4 11. Rxe4 Qxe4 12. fxe4 Be7 13. Qg4 Nd7 14. Nf5 g6 15. Nxe7 Kxe7 16. Nc3 Ne5 17. Nd5+ Kd8 18. Bg5+ Ke8 19. Qf4 Rf8 20. Nxc7+ Kd7 21. Nxa8 Rxa8 22. Rd1 Rf8 23. Qxe5 Re8 24. Qxd6+ Kc8 25. Qd7+ Kb8 26. Bf4+ Ka8 27. Qd8+ Rxd8 28. Rxd8# 1-0

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "8.168"] [White "Bowman, John"] [Black "Castillo, Osiel"] [Result "0-1"] [ECO "B23"] [Opening "Sicilian"] [Variation "closed"] [EventDate "2021.09.25"] [WhiteTeam "Florida Southern College"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. Nc3 c5 2. e4 d6 3. Nf3 a6 4. a4 Nc6 5. d4 c4 6. Bxc4 g6 7. Ng5 e6 8. O-O h5 9. Re1 Bh6 10. Nf3 Qf6 11. d5 Ne5 12. Nxe5 Qxe5 13. Qf3 exd5 14. Bxd5 f5 15. Bxh6 Nxh6 16. Rab1 f4 17. Ne2 Rf8 18. c4 Bg4 19. Qc3 Rb8 20. Qxe5+ dxe5 21. f3 Bd7 22. b3 g5 23. Nc3 g4 24. Rb2 gxf3 25. gxf3 Rf6 26. a5 Rg6+ 27. Rg2 Rxg2+ 28. Kxg2 h4 29. h3 Ke7 30. Na4 b5 31. Nc5 bxc4 32. Bxc4 Bb5 33. Bxb5 Rxb5 34. Nxa6 Rxa5 35. Nc7 Ra2+ 36. Kf1 Rb2 37. Nd5+ Kd6 38. Rd1 Rxb3 39. Nxf4+ Ke7 40. Nd5+ Ke6 41. Nc7+ Kf7 42. Kf2 Rb2+ 43. Ke3 Rb3+ 44. Rd3 Rb2 45. Rd6 Rh2 46. Rxh6 Rxh3 47. Nd5 Kg7 48. Rh5 Kg6 49. Rh8 Rh1 50. Kd3 h3 51. Ne3 h2 52. Ng4 Rd1+ 53. Ke2 h1=Q 54. Rxh1 Rxh1 55. Nxe5+ Kf6 56. f4 Rh3 57. Ng4+ Ke6 58. Kf2 Ra3 59. f5+ Ke7 60. e5 Kf7 61. e6+ Ke7 62. Nh6 Kf6 63. Ng8+ Kg7 64. e7 Ra8 65. f6+ Kxg8 66. f7+ Kxf7 0-1

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "7.165"] [White "Castillo, Osiel"] [Black "Janardhan, Advay"] [Result "0-1"] [ECO "A03"] [Opening "Bird's opening"] [EventDate "2021.09.25"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "George Mason University"] 1. f4 d5 2. Nf3 c5 3. c3 Nc6 4. d4 e6 5. e3 Nf6 6. dxc5 Bxc5 7. b4 Bb6 8. b5 Na5 9. a4 Ne4 10. Bd3 f5 11. O-O O-O 12. Bxe4 dxe4 13. Qxd8 Rxd8 14. Nd4 Nc4 15. Na3 Na5 16. Bb2 Bxd4 17. exd4 b6 18. Rfd1 Bb7 19. Kf2 Rac8 20. g3 Bd5 21. Rac1 Bb3 22. Rd2 Bxa4 23. c4 Nb3 24. Rdc2 Nxc1 25. Rxc1 Bb3 26. c5 bxc5 27. dxc5 Rd2+ 28. Ke3 Rxb2 29. b6 axb6 30. cxb6 Bd5 31. b7 Bxb7 32. Rxc8+ Bxc8 33. Kd4 Rxh2 34. Nc4 Rc2 35. Nd6 Rd2+ 36. Ke5 Rxd6 37. Kxd6 Kf7 38. Ke5 Bb7 39. Kd4 Bd5 40. Ke3 h6 41. Kd4 g5 42. Ke3 gxf4+ 43. Kd4 fxg3 44. Ke5 g2 45. Kd6 g1=Q 46. Ke5 Qg3+ 47. Kd4 f4 48. Kc5 Qc3+ 49. Kd6 Qc6+ 50. Ke5 e3 51. Kxf4 e2 52. Kg4 e1=Q 53. Kf4 Qd6+ 54. Kg4 Qeg3+ 55. Kh5 Qg5# 0-1

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "6.160"] [White "Castillo, Osiel"] [Black "Simons-Rudolph, Aedan"] [Result "0-1"] [ECO "C00"] [Opening "French"] [Variation "Labourdonnais variation"] [EventDate "2021.09.25"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "Appalachian State University"] 1. e4 e6 2. f4 d5 3. exd5 exd5 4. Nf3 Nf6 5. b3 Bc5 6. h3 O-O 7. d4 Re8+ 8. Be2 Bb6 9. Ba3 Bf5 10. Nbd2 Ne4 11. g4 Nc3 12. gxf5 Nxd1 13. Kxd1 Nd7 14. c4 c6 15. c5 Bc7 16. Bd3 Bxf4 17. Kc2 Qa5 18. Bc1 Nf6 19. Nc4 Qc7 20. Bxf4 Qxf4 21. Raf1 Qc7 22. Nd6 Re3 23. Ne5 Ne4 24. Nxe4 dxe4 25. Bc4 Rf8 26. h4 Qa5 27. Rd1 Qxa2+ 28. Kc1 Rc3# 0-1

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "5.159"] [White "Tolzmann, Ezra"] [Black "Castillo, Osiel"] [Result "1/2-1/2"] [ECO "B30"] [Opening "Sicilian defence"] [EventDate "2021.09.25"] [WhiteTeam "University of Vermont"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. e4 c5 2. Nf3 Nc6 3. c3 g6 4. d4 cxd4 5. cxd4 Bg7 6. d5 Ne5 7. Nc3 Nxf3+ 8. Qxf3 d6 9. b3 Qc7 10. Bb2 h5 11. Nb5 Qa5+ 12. Bc3 Bxc3+ 13. Qxc3 Qxc3+ 14. Nxc3 a6 15. Bd3 Nf6 16. h3 e6 17. dxe6 Bxe6 18. f4 Rc8 19. Rc1 Ke7 20. f5 gxf5 21. exf5 Bd7 22. O-O Rc5 23. Rf4 Rhc8 24. Re1+ Re5 25. Rxe5+ dxe5 26. Rc4 Rxc4 27. bxc4 Bc6 28. Kf2 e4 29. Be2 Kd6 30. Ke3 Ke5 31. g4 hxg4 32. hxg4 Nh7 33. c5 f6 34. Bf1 Nf8 35. Bg2 Nd7 36. Nxe4 Bxe4 37. Bxe4 Nxc5 38. Bc2 b5 39. a3 a5 40. Kf3 b4 41. axb4 axb4 42. Kg3 b3 43. Bb1 b2 44. Kh4 Nb3 45. g5 fxg5+ 46. Kxg5 Nd2 47. Bc2 Nf3+ 48. Kg6 Nh4+ 49. Kg5 Nf3+ 50. Kg6 Nd4 51. Bb1 Nxf5 52. Bxf5 b1=Q 53. Bxb1 1/2-1/2

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "4.140"] [White "Castillo, Osiel"] [Black "Schneiderheinze, Ben"] [Result "0-1"] [ECO "B10"] [Opening "Caro-Kann defence"] [EventDate "2021.09.25"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "Saint Louis University"] 1. e4 c6 2. f4 d5 3. exd5 cxd5 4. Nf3 Nf6 5. d3 e6 6. g3 Nc6 7. Bg2 Bd6 8. b3 b6 9. Bb2 Bb7 10. Ne5 O-O 11. Nd2 Rc8 12. h3 Bxe5 13. Bxe5 Nd7 14. Nf3 Ncxe5 15. Nxe5 Nxe5 16. fxe5 Qc7 17. O-O Qxe5 18. g4 Qd4+ 19. Kh2 Rc3 20. Rc1 Rfc8 21. Qd2 Qc5 22. Rf2 Ba6 23. Qf4 Qc7 24. Qxc7 R8xc7 25. Kg3 Bxd3 26. Kf4 Rxc2 27. Rfxc2 Rxc2 28. Rxc2 Bxc2 29. Ke5 Kf8 30. b4 Ke7 31. g5 f6+ 32. gxf6+ gxf6+ 33. Kd4 Kd6 34. a3 e5+ 35. Kc3 Be4 36. Bf1 d4+ 37. Kd2 Bd5 38. Kd3 Bc6 39. Kc4 a6 40. Kd3 Bb5+ 41. Ke4 Bxf1 42. Kf5 d3 43. Kxf6 d2 44. Kg7 d1=Q 45. Kxh7 Qf3 46. Kg7 Qxh3 0-1

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "3.145"] [White "Heidari, Ako"] [Black "Castillo, Osiel"] [Result "1-0"] [WhiteElo "1790"] [ECO "B32"] [Opening "Sicilian defence"] [EventDate "2021.09.25"] [WhiteFideId "12506389"] [WhiteTeam "George Mason University"] [BlackTeam "University of Texas at Rio Grande Valley"] 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d6 5. Nc3 a6 6. Bc4 b5 7. Nxc6 Qc7 8. Bb3 Qxc6 9. Bd5 Qc7 10. Bxa8 e6 11. O-O Qa7 12. Bc6+ Ke7 13. e5 d5 14. Bf4 Qb6 15. Bxd5 h6 16. Bf3 g5 17. Be3 Bg7 18. Bxb6 1-0

[Event "US On/L Collegiate Rapid"] [Site "lichess.org INT"] [Date "2021.09.25"] [Round "2.167"] [White "Castillo, Osiel"] [Black "Atanda, Goodness"] [Result "1-0"] [ECO "B10"] [Opening "Caro-Kann defence"] [EventDate "2021.09.25"] [WhiteTeam "University of Texas at Rio Grande Valley"] [BlackTeam "Howard University"] 1. e4 c6 2. f4 d5 3. d4 e6 4. Nc3 Bb4 5. Bd2 Nd7 6. a3 Be7 7. e5 c5 8. Nf3 cxd4 9. Nxd4 Qb6 10. Nb3 f6 11. Na4 Qc7 12. Bc3 fxe5 13. fxe5 Nxe5 14. Qh5+ Nf7 15. Bb5+ Bd7 16. Bxd7+ Qxd7 17. Nac5 Qc6 18. Bxg7 Nf6 19. Qf3 Ne5 20. Qf2 Nfg4 21. Qd4 Bh4+ 22. Ke2 Qxc5 1-0