[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.24"]
[Round "9"]
[White "Martyn, Rafe"]
[Black "Underwood, Jon"]
[Result "1/2-1/2"]
[ECO "B33"]
[WhiteElo "2206"]
[BlackElo "1993"]
[PlyCount "31"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5 Be7 10. Bxf6 Bxf6 11. c4 b4 12. Nc2 0-0 13. g3 Bg5 14. Bg2 Rb8 15. 0-0 a5 16. b3 1/2-1/2

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.23"]
[Round "7"]
[White "Ismail, Mohammed Aayan"]
[Black "Underwood, Jon"]
[Result "0-1"]
[ECO "A88"]
[WhiteElo "2111"]
[BlackElo "1993"]
[PlyCount "158"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. c4 f5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. 0-0 d6 6. d4 0-0 7. Nc3 c6 8. d5 e5 9. dxe6 Bxe6 10. Qd3 Na6 11. Ng5 Qe7 12. Nxe6 Qxe6 13. Bf4 Rad8 14. Rad1 Nc5 15. Qc2 Rfe8 16. b3 Nce4 17. Nxe4 Nxe4 18. Be3 a6 19. Bd4 Rd7 20. Bxg7 Kxg7 21. Rd4 Nf6 22. Bf3 Red8 23. Rfd1 Qe5 24. h4 h6 25. Qd2 Ne4 26. Qe3 d5 27. h5 c5 28. Rxd5 Rxd5 29. cxd5 Rxd5 30. Rxd5 Qxd5 31. hxg6 Qd4 32. Qxd4+ cxd4 33. Bg2 Kxg6 34. g4 b6 35. gxf5+ Kxf5 36. Bh3+ Kf4 37. Bc8 a5 38. Ba6 Nc3 39. a4 Ne4 40. Bb7 Nc5 41. Bd5 d3 42. exd3 Nxd3 43. Kf1 h5 44. Ke2 Nc5 45. Bf7 h4 46. Kf1 h3 47. Bd5 Ne4 48. Kg1 h2+ 49. Kg2 h1Q+ 50. Kxh1 Nxf2+ 51. Kg1 Ke3 52. Kf1 Nd3 53. Bg8 Kd2 54. Bf7 Nc1 55. Kf2 Kc3 56. Ke3 Nxb3 57. Be8 Nc5 58. Bc6 Kb4 59. Kd2 Nxa4 60. Kc2 Nc3 61. Kb2 a4 62. Be8 a3+ 63. Ka1 b5 64. Bd7 Kc5 65. Be8 b4 66. Bf7 Nd5 67. Ka2 Ne3 68. Kb3 Nf5 69. Ka2 Ne3 70. Kb3 Nf1 71. Ka2 Nd2 72. Be6 Kd4 73. Bf7 Kc3 74. Be8 Nc4 75. Ba4 Ne5 76. Bb3 Nd3 77. Bf7 Nc1+ 78. Kb1 b3 79. Ka1 b2+ 0-1

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.23"]
[Round "8"]
[White "Underwood, Jon"]
[Black "Waller, Dan"]
[Result "0-1"]
[ECO "A25"]
[WhiteElo "1993"]
[BlackElo "2110"]
[PlyCount "100"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. e3 d6 6. Nge2 f5 7. d4 Nge7 8. 0-0 0-0 9. b3 Kh8 10. Bb2 Bd7 11. Qd2 Rc8 12. Rad1 e4 13. Nf4 Qe8 14. f3 exf3 15. Bxf3 Qf7 16. Rde1 Ng8 17. Ncd5 Nf6 18. Nxf6 Qxf6 19. b4 b6 20. b5 Na5 21. Rc1 Rfe8 22. Ba3 Be6 23. Nd5 Qf7 24. e4 fxe4 25. Bxe4 Qg8 26. Qd3 a6 27. bxa6 b5 28. a7 Nxc4 29. Nf4 Nxa3 30. Qxa3 Bxd4+ 31. Kh1 Bc4 32. Rfe1 g5 33. Ng2 c5 34. Bb7 Bd5 35. Bxc8 Rxc8 36. Rcd1 Qg7 37. Qa6 Qb7 38. Qxb7 Bxb7 39. Re7 Bc6 40. Rf1 c4 41. Rff7 c3 42. Rc7 Rxc7 43. Rxc7 Bd5 44. h4 Bc5 45. Kh2 c2 46. Rc8+ Kg7 47. Rc7+ Kf8 48. Ne3 c1Q 49. Nxd5 Qg1+ 50. Kh3 Bxa7 0-1

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.22"]
[Round "6"]
[White "Underwood, Jon"]
[Black "McClement, Andrew"]
[Result "1/2-1/2"]
[ECO "A18"]
[WhiteElo "1993"]
[BlackElo "2221"]
[PlyCount "62"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. e4 d5 4. e5 d4 5. exf6 dxc3 6. bxc3 Qxf6 7. d4 c5 8. Nf3 cxd4 9. Bg5 Qf5 10. cxd4 Bb4+ 11. Bd2 Nc6 12. Bxb4 Nxb4 13. Rb1 Qa5 14. Qd2 Nc6 15. Bd3 Rb8 16. Be4 Bd7 17. d5 Qxd2+ 18. Kxd2 Na5 19. Ne5 Rc8 20. Rhc1 b6 21. Kd3 Rc5 22. Kd4 f6 23. Nxd7 Kxd7 24. dxe6+ Kxe6 25. Bd5+ Kd7 26. Rb5 Rhc8 27. Rxc5 Rxc5 28. Rc3 Nc6+ 29. Bxc6+ Kxc6 30. Ra3 a5 31. Re3 Kd7 1/2-1/2

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.21"]
[Round "5"]
[White "Jefremov, Aivar"]
[Black "Underwood, Jon"]
[Result "1/2-1/2"]
[ECO "A80"]
[WhiteElo "1645"]
[BlackElo "1993"]
[PlyCount "58"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. d4 f5 2. Nc3 Nf6 3. Bg5 d5 4. Bxf6 exf6 5. e3 Be6 6. Bd3 Nc6 7. Qf3 Qd7 8. h3 Nb4 9. Nge2 c6 10. Nf4 Nxd3+ 11. Nxd3 Bd6 12. Ne2 0-0-0 13. Nef4 Bf7 14. g4 fxg4 15. Qxg4 Qxg4 16. hxg4 Rde8 17. Kd2 h6 18. Nh5 Rhg8 19. b4 b6 20. Nhf4 Kb7 21. a4 Ra8 22. a5 Kc7 23. Ra3 Rgc8 24. Rha1 Kb7 25. c3 Re8 26. Nh5 Bf8 27. Ng3 g6 28. Rh1 Rac8 29. Rha1 Ra8 1/2-1/2

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.21"]
[Round "4"]
[White "Underwood, Jon"]
[Black "Berkley, Stephen W"]
[Result "1-0"]
[ECO "A03"]
[WhiteElo "1993"]
[BlackElo "1667"]
[PlyCount "113"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. f4 Nh6 2. Nf3 d5 3. e3 g6 4. d4 Bg7 5. b3 0-0 6. Bd3 Bf5 7. Be2 c5 8. Bb2 Nc6 9. 0-0 Ng4 10. Qd2 cxd4 11. Nxd4 Nxd4 12. Bxd4 Nf6 13. c4 dxc4 14. bxc4 Ne4 15. Qb2 Bxd4 16. exd4 Qd7 17. Nd2 Nxd2 18. Qxd2 Rad8 19. Rad1 Bg4 20. Bxg4 Qxg4 21. f5 Kg7 22. Rf3 Rd7 23. fxg6 hxg6 24. Rg3 Qe4 25. Qc3 f6 26. Re3 Qf4 27. Rf3 Qe4 28. Rh3 Rfd8 29. d5 Rc7 30. Re1 Qf4 31. Rf3 Qd6 32. Qd4 Rdd7 33. Rfe3 Kf7 34. Qh4 Qc5 35. Qh7+ Kf8 36. Qxg6 Qd4 37. Kh1 Rxc4 38. Rh3 f5 39. Qxf5+ Ke8 40. Qg6+ Kd8 41. Qg8+ Kc7 42. Rh8 Qe4 43. Qg3+ Qf4 44. Qa3 Qd6 45. Qa5+ Qb6 46. Qxb6+ Kxb6 47. h4 Rxd5 48. Rxe7 Rdd4 49. Reh7 Rd2 50. Rb8 Rc7 51. Rxc7 Kxc7 52. Rf8 Rxa2 53. Kh2 Ra3 54. h5 Ra5 55. g4 Rg5 56. Kg3 a5 57. h6 1-0

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.20"]
[Round "3"]
[White "Yu, Rock"]
[Black "Underwood, Jon"]
[Result "1/2-1/2"]
[ECO "A36"]
[WhiteElo "1817"]
[BlackElo "1993"]
[PlyCount "83"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. e4 c5 2. c4 g6 3. Nc3 Bg7 4. g3 Nc6 5. Bg2 Nf6 6. Nge2 0-0 7. 0-0 Ne8 8. d3 Nc7 9. Rb1 Ne6 10. a3 a5 11. Bd2 Ned4 12. Nxd4 Nxd4 13. Ne2 d6 14. Nxd4 Bxd4 15. b4 axb4 16. axb4 Ra3 17. Bc1 Ra7 18. Bb2 e5 19. Bxd4 cxd4 20. Qb3 Be6 21. Ra1 Qb6 22. Ra3 Rfa8 23. Rfa1 Kf8 24. h4 Ke7 25. Bf3 Kd8 26. Kf1 h6 27. g4 g5 28. hxg5 hxg5 29. Kg2 Rxa3 30. Rxa3 Rxa3 31. Qxa3 Qa6 32. Qc1 f6 33. b5 Qa5 34. Qh1 Ke7 35. Qh8 Qd8 36. Qh1 Qa8 37. Qh7+ Bf7 38. Qh1 Bg6 39. Qe1 Qa3 40. Be2 Kf8 41. Qd2 Be8 42. Bd1 1/2-1/2

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.19"]
[Round "1"]
[White "Gardiner, Eric D"]
[Black "Underwood, Jon"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "1837"]
[BlackElo "1993"]
[PlyCount "52"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. e4 c5 2. c3 d5 3. exd5 Nf6 4. Bb5+ Nbd7 5. d4 a6 6. Be2 Nxd5 7. Nf3 e6 8. c4 N5f6 9. 0-0 cxd4 10. Qxd4 Be7 11. Nc3 0-0 12. Bf4 b6 13. Rfd1 Bb7 14. Bd6 Bxd6 15. Qxd6 Qb8 16. Qb4 Qc7 17. Rd6 Rab8 18. Rad1 Rfd8 19. h3 Ba8 20. Qa4 Nc5 21. Rxd8+ Rxd8 22. Qc2 h6 23. b4 Nce4 24. Nxe4 Bxe4 25. Rxd8+ Qxd8 26. Qd2 Qc7 1/2-1/2

[Event "Cambridge op 2nd"]
[Site "Cambridge"]
[Date "2024.02.19"]
[Round "2"]
[White "Underwood, Jon"]
[Black "Prince, Alan R"]
[Result "0-1"]
[ECO "A02"]
[WhiteElo "1993"]
[BlackElo "1641"]
[PlyCount "99"]
[EventDate "2024.02.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ENG"]
[SourceTitle "CB09_2024"]
[SourceDate "2024.02.28"]
[SourceVersion "1"]
[SourceVersionDate "2024.02.28"]
[SourceQuality "1"]

1. f4 d6 2. Nf3 g6 3. g3 Bg7 4. Bg2 e5 5. fxe5 dxe5 6. d3 Ne7 7. Nc3 c6 8. Be3 Nf5 9. Bf2 Nd7 10. Qd2 Bh6 11. e3 Qb6 12. Nd1 0-0 13. 0-0 Re8 14. g4 Nd4 15. h4 Nxf3+ 16. Bxf3 e4 17. Bg2 f5 18. g5 Bg7 19. d4 Qc7 20. Nc3 Bf8 21. Ne2 Bd6 22. Qe1 Nb6 23. Bg3 Bxg3 24. Nxg3 Be6 25. b3 Rad8 26. Ne2 Nd5 27. Qd2 b5 28. c4 bxc4 29. bxc4 Nb6 30. c5 Nd5 31. Rab1 Rb8 32. a3 Rxb1 33. Rxb1 Rb8 34. Rxb8+ Qxb8 35. Nc3 Nxc3 36. Qxc3 Qg3 37. d5 Bxd5 38. Qf6 Qxe3+ 39. Kh2 Qxc5 40. h5 Qf8 41. Qd4 Qg7 42. Qb4 Qe5+ 43. Kg1 gxh5 44. Qb7 f4 45. Qa8+ Kg7 46. Qxa7+ Bf7 47. Kf2 c5 48. Qb6 e3+ 49. Ke1 Qxg5 50. Be4 0-1

[Event "Hvar op"]
[Site "Hvar"]
[Date "2023.10.21"]
[Round "9"]
[White "Grgurevic, Boris"]
[Black "Underwood, Jon"]
[Result "1-0"]
[ECO "B50"]
[WhiteElo "2085"]
[BlackElo "1999"]
[PlyCount "53"]
[EventDate "2023.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "Mega2024 Update 01"]
[Source "Chessbase"]
[SourceDate "2023.11.12"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.12"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Be2 Bd7 5. d3 Nc6 6. Bg5 e6 7. Nbd2 Be7 8. 0-0 0-0 9. Nc4 Qc7 10. a4 d5 11. e5 Ng4 12. Bxe7 Nxe7 13. h3 Nxf2 14. Rxf2 dxc4 15. d4 cxd4 16. Qxd4 Bc6 17. Qxc4 Ng6 18. Qc5 b6 19. Qe3 Rad8 20. Re1 Bxa4 21. Bd3 Bc6 22. Ng5 Qe7 23. h4 Nxh4 24. Bxh7+ Kh8 25. Bb1 f6 26. Qe2 Qe8 27. Nxe6 1-0

[Event "Hvar op"]
[Site "Hvar"]
[Date "2023.10.19"]
[Round "7"]
[White "Daksh, Jain1"]
[Black "Underwood, Jon"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "1735"]
[BlackElo "1999"]
[PlyCount "41"]
[EventDate "2023.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "Mega2024 Update 01"]
[Source "Chessbase"]
[SourceDate "2023.11.12"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.12"]
[SourceQuality "1"]

1. e4 c5 2. c3 d5 3. exd5 Nf6 4. d4 Nxd5 5. Nf3 e6 6. Bd3 cxd4 7. cxd4 Bb4+ 8. Bd2 Bxd2+ 9. Qxd2 Nc6 10. Nc3 0-0 11. 0-0 b6 12. Rad1 Bb7 13. Bb1 Nf6 14. d5 exd5 15. Nxd5 Nxd5 16. Qxd5 Qxd5 17. Rxd5 Rfd8 18. Rfd1 Rxd5 19. Rxd5 f6 20. Rd7 Rd8 21. Rxd8+ 1/2-1/2

[Event "Hvar op"]
[Site "Hvar"]
[Date "2023.10.18"]
[Round "6"]
[White "Underwood, Jon"]
[Black "Kostov, Deyan Samuil"]
[Result "0-1"]
[ECO "A25"]
[WhiteElo "1999"]
[BlackElo "2262"]
[PlyCount "72"]
[EventDate "2023.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "Mega2024 Update 01"]
[Source "Chessbase"]
[SourceDate "2023.11.12"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.12"]
[SourceQuality "1"]

1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. e3 Bg7 5. Ne2 d6 6. Nbc3 h5 7. d4 h4 8. d5 Nce7 9. e4 f5 10. Bg5 h3 11. Bf3 Nf6 12. Qd2 Kf7 13. 0-0 Nh7 14. Be3 Bf6 15. exf5 gxf5 16. Bh5+ Kg7 17. Bh6+ Kg8 18. f4 e4 19. Nd4 Nf8 20. Bxf8 Qxf8 21. Bd1 Qg7 22. Ne6 Bxe6 23. dxe6 Bxc3 24. bxc3 Rh6 25. c5 d5 26. Rb1 Rb8 27. c6 b6 28. Bb3 Rd8 29. c4 d4 30. c5 d3 31. Qe3 Kf8 32. cxb6 axb6 33. Rbc1 Nd5 34. Bxd5 Rxd5 35. Qxb6 cxb6 36. c7 Qd4+ 0-1

[Event "Hvar op"]
[Site "Hvar"]
[Date "2023.10.18"]
[Round "5"]
[White "Underwood, Jon"]
[Black "Lavrov, Maxim1"]
[Result "1/2-1/2"]
[ECO "A30"]
[WhiteElo "1999"]
[BlackElo "2173"]
[PlyCount "147"]
[EventDate "2023.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "Mega2024 Update 01"]
[Source "Chessbase"]
[SourceDate "2023.11.12"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.12"]
[SourceQuality "1"]

1. c4 c5 2. g3 Nf6 3. Bg2 e6 4. Nf3 Be7 5. 0-0 0-0 6. Nc3 d6 7. d4 cxd4 8. Nxd4 a6 9. b3 Qc7 10. Bb2 Nbd7 11. Rc1 Re8 12. Qd2 Ne5 13. e4 Bd7 14. f4 Ng6 15. Nd1 Rac8 16. Nf2 Qb8 17. Nf3 Bc6 18. Nd4 Bd7 19. Nf3 h5 20. e5 Ng4 21. exd6 Bxd6 22. Ne4 Be7 23. h3 Bc6 24. hxg4 Bxe4 25. gxh5 Red8 26. Qe1 Bxf3 27. Bxf3 Nf8 28. Rd1 b5 29. Rxd8 Bxd8 30. cxb5 Qxb5 31. Qe4 f5 32. Qb1 Bb6+ 33. Kg2 Qc5 34. Kh1 Qe3 35. Qe1 Rc2 36. Qxe3 Bxe3 37. Be5 Rxa2 38. Ra1 Rxa1+ 39. Bxa1 Nd7 40. Be2 a5 41. Bc3 Bb6 42. Kg2 Kf7 43. Bc4 Nf6 44. Be2 Ne4 45. Be1 Kf6 46. Kf3 e5 47. fxe5+ Kxe5 48. g4 f4 49. Bd3 Ng5+ 50. Kg2 f3+ 51. Kg3 Kd4 52. Bf2+ Kxd3 53. Bxb6 Ke2 54. Kf4 Ne6+ 55. Kf5 Nc7 56. Kg6 Nd5 57. Bg1 Kf1 58. Ba7 Ke2 59. Bg1 Kf1 60. Ba7 Ke2 61. Kxg7 Ne3 62. Bxe3 Kxe3 63. h6 f2 64. h7 f1Q 65. h8Q Qa1+ 66. Kg8 Qxh8+ 67. Kxh8 Kf4 68. Kg7 Kxg4 69. Kf6 Kf4 70. Ke6 Ke4 71. Kd6 Kd4 72. Kc6 Kc3 73. Kb5 Kxb3 74. Kxa5 1/2-1/2

[Event "Hvar op"]
[Site "Hvar"]
[Date "2023.10.16"]
[Round "3"]
[White "Cvitan, Ena"]
[Black "Underwood, Jon"]
[Result "1/2-1/2"]
[ECO "A80"]
[WhiteElo "2281"]
[BlackElo "1999"]
[PlyCount "121"]
[EventDate "2023.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "Mega2024 Update 01"]
[Source "Chessbase"]
[SourceDate "2023.11.12"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.12"]
[SourceQuality "1"]

1. d4 f5 2. Bf4 Nf6 3. e3 g6 4. h4 h6 5. Nc3 d6 6. Qf3 Nc6 7. 0-0-0 e6 8. Qg3 Rg8 9. Qf3 Qe7 10. Bc4 Bd7 11. d5 exd5 12. Nxd5 Nxd5 13. Bxd5 Rh8 14. Ne2 Bg7 15. Nd4 Qf6 16. c3 Nxd4 17. exd4 c6 18. Bb3 0-0-0 19. Qg3 Bf8 20. Rhe1 Re8 21. Rxe8+ Bxe8 22. Re1 Bd7 23. a4 Rh7 24. a5 Re7 25. Rxe7 Bxe7 26. a6 Qxh4 27. axb7+ Kxb7 28. Qxh4 Bxh4 29. Bxh6 d5 30. g3 Bf6 31. Kd2 g5 32. Bf8 Kc7 33. Bc5 a6 34. Ke3 Be6 35. Bc2 Kb7 36. Bd3 Bd8 37. Bd6 Bf6 38. Kd2 Bd8 39. Kc2 Kb6 40. Kb3 Bd7 41. Kb4 Be6 42. Bc5+ Kb7 43. Bf8 Bb6 44. Be7 g4 45. Bd6 Bd7 46. Kb3 Bd8 47. Bf4 Be7 48. Kc2 c5 49. Kd2 cxd4 50. cxd4 Bf6 51. Kc3 Be7 52. Kb3 Kb6 53. Kc3 Kb7 54. Be2 Kb6 55. f3 Bf6 56. Bd6 Bg5 57. fxg4 fxg4 58. Bd3 Bb5 59. Bf5 Be2 60. Be6 Bf3 61. Be5 1/2-1/2

[Event "Hvar op"]
[Site "Hvar"]
[Date "2023.10.16"]
[Round "2"]
[White "Underwood, Jon"]
[Black "Dizdarevic, Emir"]
[Result "1/2-1/2"]
[ECO "A10"]
[WhiteElo "1999"]
[BlackElo "2367"]
[PlyCount "45"]
[EventDate "2023.10.15"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "CRO"]
[SourceTitle "Mega2024 Update 01"]
[Source "Chessbase"]
[SourceDate "2023.11.12"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.12"]
[SourceQuality "1"]

1. c4 b6 2. Nc3 Bb7 3. e4 e5 4. a3 g6 5. g3 Bg7 6. Bg2 Nc6 7. Nge2 Nge7 8. d3 Nd4 9. Nxd4 exd4 10. Nd5 Nxd5 11. exd5 0-0 12. 0-0 c5 13. Bf4 Re8 14. Qd2 d6 15. Rfe1 Qd7 16. b4 Bf8 17. h4 Rxe1+ 18. Rxe1 Re8 19. Kh2 Rxe1 20. Qxe1 Bc8 21. bxc5 bxc5 22. Qb1 Qc7 23. Bh3 1/2-1/2

[Event "London CSC 5-Day U2050 op 10th"]
[Site "London"]
[Date "2018.12.13"]
[Round "5"]
[White "Haldane, Robin W"]
[Black "Underwood, Jon"]
[Result "0-1"]
[ECO "B99"]
[WhiteElo "2011"]
[BlackElo "1949"]
[PlyCount "140"]
[EventDate "2018.12.09"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "ENG"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7 9. 0-0-0 Nbd7 10. Bd3 h6 11. Bh4 g5 12. fxg5 Ne5 13. Qe2 Nfg4 14. Nf3 hxg5 15. Bg3 Qc5 16. Nxe5 Nxe5 17. h3 b5 18. Bf2 Qc7 19. Bd4 Bd7 20. Bxe5 dxe5 21. Qf3 b4 22. Ne2 a5 23. Kb1 a4 24. Rc1 Qb6 25. Rhf1 Rh7 26. c4 bxc3 27. Rxc3 Rb8 28. Rc2 Ba3 29. Qf2 Qxf2 30. Rxf2 g4 31. hxg4 Rg7 32. Ng3 Rxg4 33. Nh5 Be7 34. Nf6+ Bxf6 35. Rxf6 Ke7 36. Rff2 Rc8 37. Rxc8 Bxc8 38. Kc2 Bd7 39. a3 Bc6 40. Re2 Kd6 41. Kc3 Kc5 42. Rc2 Bxe4 43. Bxe4 Rxe4 44. b4+ axb3 45. Kxb3+ Kb5 46. Rc7 Re3+ 47. Kb2 Re2+ 48. Kc3 f5 49. Re7 Rxg2 50. Rxe6 Re2 51. Kd3 Re1 52. Kd2 Re4 53. Kd3 Kc5 54. Ra6 Rd4+ 55. Kc3 Kd5 56. a4 f4 57. a5 f3 58. Rf6 Ke4 59. a6 Ra4 60. Kb3 Ra1 61. Kb2 Ra5 62. Kc3 Ke3 63. Rf5 Ra3+ 64. Kb2 Rxa6 65. Rxe5+ Kf2 66. Kc2 Rd6 67. Re8 Kf1 68. Rf8 f2 69. Re8 Rg6 70. Kd2 Kg1 0-1

[Event "London CSC 5-Day U2050 op 10th"]
[Site "London"]
[Date "2018.12.12"]
[Round "4"]
[White "Wood, Peter R"]
[Black "Underwood, Jon"]
[Result "0-1"]
[ECO "B25"]
[WhiteElo "1897"]
[BlackElo "1949"]
[PlyCount "112"]
[EventDate "2018.12.09"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "ENG"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 e6 7. Nf3 Nge7 8. 0-0 0-0 9. Be3 b6 10. d4 d5 11. exd5 Nf5 12. Bf2 Ncxd4 13. Ne5 exd5 14. Bxd5 Ba6 15. Re1 Rc8 16. g4 Nd6 17. Bxd4 cxd4 18. Qxd4 Qc7 19. Rad1 Nc4 20. Bxc4 Bxc4 21. Qxc4 Qxc4 22. Nxc4 Rxc4 23. Re7 Rxf4 24. h3 Bxc3 25. bxc3 Ra4 26. Rdd7 Rxa2 27. Rxa7 Rxc2 28. Rab7 Rxc3 29. Rxb6 Rxh3 30. Kg2 Ra3 31. Rbb7 h6 32. Rec7 Kg7 33. Rc6 Ra5 34. Kf3 h5 35. gxh5 Rxh5 36. Kf4 Rf5+ 37. Kg4 Re8 38. Rc1 Re2 39. Kg3 Re4 40. Rcc7 g5 41. Rc6 Ra5 42. Rc3 Kg6 43. Rcc7 Ra3+ 44. Kf2 Rf4+ 45. Kg2 g4 46. Rc5 Ra2+ 47. Kg3 Rd4 48. Rb6+ f6 49. Rc3 Ra5 50. Rb8 Kf5 51. Re8 Rad5 52. Ree3 Kg5 53. Rc8 Rd3 54. Rg8+ Kf5 55. Rge8 Rxe3+ 56. Rxe3 Kg5 0-1

[Event "London CSC 5-Day U2050 op 10th"]
[Site "London"]
[Date "2018.12.11"]
[Round "3"]
[White "Underwood, Jon"]
[Black "Landenberger, Anja Kathrin"]
[Result "1-0"]
[ECO "A94"]
[WhiteElo "1949"]
[BlackElo "1751"]
[PlyCount "49"]
[EventDate "2018.12.09"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "ENG"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. c4 e6 2. g3 d5 3. Nf3 c6 4. d4 Nf6 5. Bg2 Be7 6. 0-0 0-0 7. Qc2 Ne4 8. b3 Nd7 9. Ba3 Bxa3 10. Nxa3 Qe7 11. Qb2 a5 12. Rac1 f5 13. Nc2 Rf6 14. Nce1 g5 15. Nd3 h5 16. Nfe5 h4 17. g4 Nxe5 18. Nxe5 Nd6 19. h3 Nf7 20. f4 gxf4 21. Rxf4 Nxe5 22. dxe5 Rg6 23. Bf3 Qg5 24. e3 Bd7 25. Kh2 1-0

[Event "London CSC 5-Day U2050 op 10th"]
[Site "London"]
[Date "2018.12.10"]
[Round "2"]
[White "Livesey, R Nigel"]
[Black "Underwood, Jon"]
[Result "1/2-1/2"]
[ECO "A10"]
[WhiteElo "1775"]
[BlackElo "1949"]
[PlyCount "61"]
[EventDate "2018.12.09"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "ENG"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. c4 f5 2. Nf3 Nf6 3. Nc3 d6 4. d3 e5 5. e4 c5 6. g3 Nc6 7. Bg2 Be7 8. Be3 fxe4 9. dxe4 Nd4 10. Qd3 0-0 11. 0-0 Bg4 12. Bxd4 cxd4 13. Nd5 Nxd5 14. exd5 Qd7 15. Nd2 Rf7 16. Ne4 Raf8 17. Rac1 b6 18. b3 Bf3 19. Nd2 Bxg2 20. Kxg2 Bg5 21. Rc2 Bxd2 22. Rxd2 Qg4 23. f3 Qg5 24. Rdf2 a5 25. a4 Rf6 26. f4 exf4 27. Qxd4 fxg3 28. hxg3 Rxf2+ 29. Rxf2 Rxf2+ 30. Qxf2 Qd8 31. Qe3 1/2-1/2

[Event "London CSC 5-Day U2050 op 10th"]
[Site "London"]
[Date "2018.12.09"]
[Round "1"]
[White "Underwood, Jon"]
[Black "Cowan, Xavier"]
[Result "1-0"]
[ECO "A20"]
[WhiteElo "1949"]
[BlackElo "1734"]
[PlyCount "51"]
[EventDate "2018.12.09"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "ENG"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. c4 e5 2. g3 c6 3. d4 exd4 4. Qxd4 Nf6 5. Bg2 d6 6. Nf3 Be7 7. 0-0 0-0 8. Nc3 Na6 9. Rd1 Nc7 10. e4 Ne6 11. Qd2 Nd7 12. b3 a6 13. Bb2 b5 14. Nd4 Qb6 15. Nf5 Bf6 16. Nxd6 Ndc5 17. b4 Nb7 18. c5 Qc7 19. e5 Be7 20. f4 Rd8 21. Nce4 a5 22. a3 Rd7 23. f5 Nf8 24. Bh3 Bxd6 25. exd6 Qb8 26. Qg5 1-0

[Event "West Wales op"]
[Site "Swansea"]
[Date "2018.10.19"]
[Round "1"]
[White "Howells, Chris"]
[Black "Underwood, Jon"]
[Result "0-1"]
[ECO "A21"]
[WhiteElo "1904"]
[BlackElo "2114"]
[PlyCount "113"]
[EventDate "2018.10.12"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "WLS"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. c4 f5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. 0-0 0-0 6. d3 d6 7. Nc3 e5 8. e4 Nc6 9. Bg5 h6 10. Bxf6 Qxf6 11. Nd5 Qf7 12. Nh4 Bf6 13. Nxf6+ Qxf6 14. exf5 Bxf5 15. Nxf5 Qxf5 16. f4 exf4 17. Rxf4 Qc5+ 18. Kh1 Rxf4 19. gxf4 Rf8 20. Qg4 Qf5 21. Qg3 Ne7 22. Re1 Qf6 23. Bxb7 Qxb2 24. Rxe7 Qxb7+ 25. Kg1 Qb1+ 26. Re1 Qb6+ 27. Kg2 Qb2+ 28. Kh3 Qf6 29. Re4 Kg7 30. Qe3 Rf7 31. Kg3 a6 32. Re6 Qf5 33. Qd4+ Kh7 34. Re8 Rg7 35. Qe4 Qc5 36. Re7 Qg1+ 37. Kh3 Qa1 38. d4 Qf1+ 39. Kg3 Qxc4 40. f5 gxf5+ 41. Rxg7+ Kxg7 42. Qxf5 Qc3+ 43. Kg2 Qd2+ 44. Kf1 Qd1+ 45. Kg2 Qe2+ 46. Kg1 Qe3+ 47. Kf1 Qxd4 48. Qd7+ Kf6 49. Qxc7 Qa1+ 50. Kg2 Qxa2+ 51. Kg3 Qb3+ 52. Kg2 Qd5+ 53. Kg3 Qe5+ 54. Kg2 a5 55. Qd8+ Kg6 56. Qc7 Qc5 57. Qe7 0-1

[Event "West Wales op"]
[Site "Swansea"]
[Date "2018.10.14"]
[Round "4"]
[White "Musson, Adam"]
[Black "Underwood, Jon"]
[Result "1-0"]
[ECO "A04"]
[WhiteElo "2090"]
[BlackElo "2114"]
[PlyCount "61"]
[EventDate "2018.10.12"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "WLS"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. Nf3 f5 2. d3 d6 3. e4 e5 4. c4 c5 5. Nc3 Be7 6. g3 Nc6 7. Bg2 Nf6 8. 0-0 0-0 9. a3 fxe4 10. dxe4 Nd4 11. Nxd4 cxd4 12. Nd5 Nxd5 13. exd5 Bg5 14. f4 Bh6 15. fxe5 Rxf1+ 16. Qxf1 Bxc1 17. Rxc1 dxe5 18. Qe2 Qg5 19. Re1 Bg4 20. Qe4 Re8 21. d6 Kh8 22. Qxd4 Qc1 23. Qe4 Qd2 24. c5 Bf5 25. Qb4 Qc2 26. Bxb7 e4 27. Qc3 Qa4 28. c6 Qb5 29. Qd4 Bh3 30. a4 Qf5 31. d7 1-0

[Event "West Wales op"]
[Site "Swansea"]
[Date "2018.10.14"]
[Round "5"]
[White "Underwood, Jon"]
[Black "Jones, Iolo Cerredig"]
[Result "1-0"]
[ECO "E11"]
[WhiteElo "2114"]
[BlackElo "2225"]
[PlyCount "89"]
[EventDate "2018.10.12"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "WLS"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. c4 Nf6 2. d4 e6 3. g3 Bb4+ 4. Bd2 a5 5. Bg2 d5 6. Qc2 Nc6 7. Nf3 Ne4 8. e3 0-0 9. 0-0 Bxd2 10. Nbxd2 Nb4 11. Qb1 Nxd2 12. Nxd2 c6 13. a3 Na6 14. Qc2 Nc7 15. b4 Qe7 16. Qb2 b5 17. c5 Bd7 18. Nb3 a4 19. Nc1 f6 20. Nd3 Rae8 21. Rae1 Qf7 22. f4 Qg6 23. Qe2 Qh6 24. h4 Qg6 25. Kh2 Re7 26. Rh1 Be8 27. g4 Kh8 28. Ref1 Bd7 29. h5 Qe8 30. Kg1 Qc8 31. Bf3 Na6 32. Rf2 Nb8 33. g5 Be8 34. h6 fxg5 35. fxg5 Nd7 36. Bg4 Bg6 37. Nf4 Bf5 38. g6 Bxg4 39. Qxg4 Nf6 40. Qg5 gxh6 41. Rxh6 Qb8 42. gxh7 Rg7 43. Ng6+ Rxg6 44. Qxg6 Ne4 45. Rg2 1-0

[Event "West Wales op"]
[Site "Swansea"]
[Date "2018.10.13"]
[Round "2"]
[White "Underwood, Jon"]
[Black "Jones, Ian Robert"]
[Result "1/2-1/2"]
[ECO "A26"]
[WhiteElo "2114"]
[BlackElo "2006"]
[PlyCount "57"]
[EventDate "2018.10.12"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "WLS"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. c4 d6 2. Nc3 e5 3. g3 g6 4. Bg2 Bg7 5. e4 Nc6 6. Nge2 f5 7. d3 Nf6 8. 0-0 0-0 9. f3 fxe4 10. dxe4 Be6 11. Nd5 Ne7 12. Be3 c6 13. Nxf6+ Bxf6 14. Rc1 d5 15. cxd5 cxd5 16. exd5 Nxd5 17. Bc5 Rf7 18. Qa4 Rc8 19. Bf2 b6 20. Rxc8 Qxc8 21. Rc1 Qd7 22. Qxd7 Rxd7 23. a3 Bg5 24. Rd1 Ne3 25. Rxd7 Bxd7 26. f4 exf4 27. gxf4 Nxg2 28. fxg5 Bg4 29. Nd4 1/2-1/2

[Event "West Wales op"]
[Site "Swansea"]
[Date "2018.10.13"]
[Round "3"]
[White "Underwood, Jon"]
[Black "Paul, Nathanael"]
[Result "1-0"]
[ECO "A11"]
[WhiteElo "2114"]
[BlackElo "2090"]
[PlyCount "133"]
[EventDate "2018.10.12"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "WLS"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. c4 c6 2. Nc3 d5 3. e3 Nf6 4. Nf3 Nbd7 5. Qc2 e6 6. b3 Be7 7. Bb2 0-0 8. Be2 b6 9. 0-0-0 dxc4 10. Bxc4 b5 11. Be2 Nb6 12. Rhg1 a5 13. g4 a4 14. g5 Nfd5 15. Nxd5 Nxd5 16. Kb1 axb3 17. Qxb3 Qa5 18. Nd4 Bd7 19. Rc1 c5 20. Nxb5 Rfb8 21. a4 Qxa4 22. Qxa4 Rxa4 23. Nc3 Rab4 24. Rc2 Nxc3+ 25. dxc3 R4b6 26. Bc4 Bd6 27. f4 e5 28. Rf2 Bf5+ 29. Kc1 exf4 30. Rgg2 Be4 31. Rg4 Bf5 32. Rgg2 g6 33. exf4 Re8 34. Kd1 Bc7 35. Bd5 Rd8 36. c4 Rb4 37. Bf6 Rb1+ 38. Kd2 Re8 39. Be5 Bxe5 40. fxe5 Rxe5 41. Re2 Rb2+ 42. Ke1 Rbxe2+ 43. Rxe2 Rxe2+ 44. Kxe2 Kf8 45. Ke3 Ke7 46. Kf4 Bd7 47. Ke5 Bh3 48. Bc6 Bf5 49. h4 Be6 50. Bb5 Bc8 51. Kd5 f5 52. Kxc5 Ke6 53. Kd4 Bd7 54. Ba6 Bc6 55. c5 Bd7 56. Bc4+ Ke7 57. Ke5 Bc6 58. Bg8 Kf8 59. Bb3 Ke7 60. Bc4 Kd7 61. Bg8 Ke7 62. Bxh7 Kf7 63. h5 gxh5 64. Bxf5 Kg7 65. Be4 Bd7 66. c6 Bc8 67. Bf5 1-0

[Event "London Kings Place Rapid op 6th"]
[Site "London"]
[Date "2018.07.07"]
[Round "5"]
[White "Motta Leon, Gerardo"]
[Black "Underwood, Jon"]
[Result "1-0"]
[ECO "B92"]
[WhiteElo "2015"]
[BlackElo "1949"]
[PlyCount "65"]
[EventDate "2018.07.07"]
[EventType "swiss (rapid)"]
[EventRounds "6"]
[EventCountry "ENG"]
[SourceTitle "EXT 2019"]
[Source "ChessBase"]
[SourceDate "2018.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2018.10.10"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. 0-0 Be6 9. a4 Nbd7 10. Be3 Rc8 11. f3 Nb6 12. a5 Nc4 13. Bxc4 Bxc4 14. Bb6 Qd7 15. Rf2 0-0 16. Rd2 Qe6 17. Nc1 d5 18. Nxd5 Bc5+ 19. Bxc5 Rxc5 20. Nb6 Rxa5 21. Rd6 Rxa1 22. Rxe6 Bxe6 23. Kf2 Ra5 24. c4 Rc5 25. b4 Rc6 26. c5 a5 27. Nd5 Nxd5 28. exd5 Rd8 29. dxc6 Rxd1 30. cxb7 Rd8 31. c6 Rb8 32. bxa5 Bc8 33. a6 1-0

