[Event "BRA Amateur-ch U1800"]
[Site "Sao Paulo"]
[Date "2022.11.06"]
[Round "7"]
[White "Sakai, Erik Oneda"]
[Black "Santos, Marcos Correia"]
[Result "1-0"]
[ECO "E65"]
[WhiteElo "1712"]
[BlackElo "1632"]
[PlyCount "83"]
[EventDate "2022.11.03"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 211 Extra"]
[Source "ChessBase"]
[SourceDate "2023.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.01.31"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 Nf6 3. Nc3 g6 4. g3 Bg7 5. Bg2 0-0 6. 0-0 Nc6 7. e3 d6 8. d4 cxd4 9. exd4 Bg4 10. h3 Bf5 11. a3 Rc8 12. Nh4 Bd7 13. b4 Nh5 14. Be3 e5 15. d5 Ne7 16. Qb3 f5 17. Bg5 f4 18. g4 Nf6 19. Ne4 Nxe4 20. Bxe4 Qe8 21. c5 Kh8 22. cxd6 Ng8 23. Qd3 Nf6 24. Bxg6 hxg6 25. Nxg6+ Kg8 26. Ne7+ Kh8 27. Ng6+ Kg8 28. Nxf8 Qxf8 29. Bxf6 Qxf6 30. Rac1 Qxd6 31. Rxc8+ Bxc8 32. Qc4 Bd7 33. Rc1 Qg6 34. f3 Qb6+ 35. Qc5 Qa6 36. b5 Qxb5 37. Qxb5 Bxb5 38. Rc8+ Kh7 39. Rc7 Ba6 40. d6 Kg6 41. Rxg7+ Kxg7 42. d7 1-0

[Event "BRA Amateur-ch U1800"]
[Site "Sao Paulo"]
[Date "2022.11.05"]
[Round "6"]
[White "Medola, Eduarda Migliorini"]
[Black "Sakai, Erik Oneda"]
[Result "0-1"]
[ECO "A82"]
[WhiteElo "1403"]
[BlackElo "1712"]
[PlyCount "166"]
[EventDate "2022.11.03"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 211 Extra"]
[Source "ChessBase"]
[SourceDate "2023.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.01.31"]
[SourceQuality "1"]

1. d4 f5 2. Nc3 g6 3. e4 fxe4 4. Nxe4 Bg7 5. Nf3 Nf6 6. Nxf6+ exf6 7. Qe2+ Qe7 8. Qxe7+ Kxe7 9. Bc4 Re8 10. 0-0 d6 11. Re1+ Kf8 12. Bd2 Bf5 13. Rxe8+ Kxe8 14. Re1+ Kf8 15. c3 Nc6 16. Be6 Bxe6 17. Rxe6 Re8 18. Rxe8+ Kxe8 19. Be3 a6 20. b3 Ne7 21. c4 d5 22. c5 Kd7 23. Kf1 h6 24. a3 Ke6 25. b4 f5 26. h4 Ng8 27. Bf4 Kd7 28. Be5 Bf8 29. Bh8 Ke6 30. Ne5 g5 31. Ng6 Be7 32. Nxe7 Nxe7 33. Bg7 Ng8 34. g3 Kf7 35. Be5 c6 36. f3 Kg6 37. hxg5 hxg5 38. Ke2 Kh5 39. Kd3 Ne7 40. Bd6 Ng6 41. Ke3 Nh8 42. Bc7 Nf7 43. Kf2 Kg6 44. Ke2 Kf6 45. Kd3 g4 46. f4 Ke6 47. Be5 Kd7 48. Ke3 Nh6 49. Kd3 Ng8 50. Ke3 Ne7 51. a4 Nc8 52. Bb8 b6 53. a5 bxa5 54. bxa5 Ne7 55. Be5 Ng6 56. Bd6 Nh8 57. Be5 Nf7 58. Bb8 Kc8 59. Ba7 Nh6 60. Kd3 Ng8 61. Ke3 Nf6 62. Kf2 Ne4+ 63. Kg2 Nd2 64. Kf2 Nb3 65. Bb6 Nxd4 66. Ke3 Nf3 67. Kd3 Kd7 68. Ba7 Ke6 69. Bb8 d4 70. Kc4 Nd2+ 71. Kxd4 Ne4 72. Bc7 Nxg3 73. Bd8 Ne4 74. Bh4 g3 75. Ke3 g2 76. Bf2 Nxf2 77. Kxf2 Kd5 78. Kxg2 Kxc5 79. Kg3 Kd4 80. Kh4 c5 81. Kh5 c4 82. Kg6 Ke4 83. Kg5 c3 0-1

[Event "BRA Amateur-ch U1800"]
[Site "Sao Paulo"]
[Date "2022.11.05"]
[Round "5"]
[White "Sakai, Erik Oneda"]
[Black "De Oliveira, Tobias Luiz Carvalh"]
[Result "1/2-1/2"]
[ECO "A38"]
[WhiteElo "1712"]
[BlackElo "1219"]
[PlyCount "149"]
[EventDate "2022.11.03"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 211 Extra"]
[Source "ChessBase"]
[SourceDate "2023.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.01.31"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nf6 5. 0-0 0-0 6. Nc3 Nc6 7. d3 d6 8. Rb1 Rb8 9. a3 a6 10. Bd2 Bd7 11. Qc1 Qe8 12. b4 cxb4 13. axb4 b5 14. cxb5 axb5 15. Bh6 Bh8 16. Re1 Qc8 17. Qd2 Ng4 18. Rec1 Nxh6 19. Qxh6 Bg7 20. Qd2 h5 21. d4 Qa6 22. d5 Ne5 23. Nxe5 Bxe5 24. Ra1 Qb6 25. Ra5 Rbc8 26. e3 Rc4 27. Ne2 Rxc1+ 28. Nxc1 Rc8 29. Nd3 Bc3 30. Qa2 Bf5 31. Ra6 Qb8 32. e4 Bg4 33. h3 Bd7 34. Ra7 Be8 35. Rxe7 Rc4 36. Qa7 Qxa7 37. Rxa7 Kf8 38. e5 Bxe5 39. Nxe5 dxe5 40. d6 Rd4 41. Ra6 Rxb4 42. Rb6 Rd4 43. Bb7 Bd7 44. Ba6 b4 45. Kf1 Bxh3+ 46. Ke2 b3 47. Rb8+ Kg7 48. Rxb3 Rxd6 49. Bb7 Bg4+ 50. f3 Bf5 51. Ke3 Rd8 52. Bc6 Rc8 53. Bd5 Be6 54. Bxe6 fxe6 55. Ke4 Kf6 56. Rb4 Rc1 57. Ke3 Kf5 58. Rb8 Rc3+ 59. Ke2 e4 60. Rf8+ Kg5 61. f4+ Kg4 62. Rf6 Kxg3 63. Rxg6+ Kxf4 64. Rxe6 e3 65. Rf6+ Kg3 66. Rg6+ Kh3 67. Kf3 h4 68. Rg1 e2+ 69. Kf2 Rc2 70. Rh1+ Kg4 71. Rg1+ Kf4 72. Rg8 e1Q+ 73. Kxe1 Ke3 74. Kf1 h3 75. Rg3+ 1/2-1/2

[Event "BRA Amateur-ch U1800"]
[Site "Sao Paulo"]
[Date "2022.11.04"]
[Round "3"]
[White "Sakai, Erik Oneda"]
[Black "Bernardo, Henrique Carvalho"]
[Result "0-1"]
[ECO "B25"]
[WhiteElo "1712"]
[BlackElo "1341"]
[PlyCount "90"]
[EventDate "2022.11.03"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 211 Extra"]
[Source "ChessBase"]
[SourceDate "2023.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.01.31"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 d6 3. d3 Nf6 4. g3 g6 5. Bg2 Bg7 6. f4 a6 7. Nf3 Nc6 8. 0-0 0-0 9. a4 e6 10. h3 h5 11. Be3 Nd7 12. f5 Nd4 13. fxg6 fxg6 14. Rb1 Rb8 15. Ne2 Nxf3+ 16. Rxf3 Rxf3 17. Bxf3 Ne5 18. Bg2 Bd7 19. b3 Qe7 20. Qd2 Rf8 21. Rf1 Rxf1+ 22. Kxf1 Qf6+ 23. Kg1 Nf3+ 24. Bxf3 Qxf3 25. Bf4 e5 26. Qe3 Qxe3+ 27. Bxe3 Bxh3 28. Nc3 Be6 29. Bg5 Bf8 30. Kf2 Kf7 31. Bd8 Be7 32. Bb6 g5 33. a5 h4 34. Kg2 Kg6 35. Nd1 h3+ 36. Kh2 g4 37. Ne3 Bg5 38. Nc4 Bxc4 39. dxc4 Kf7 40. Bc7 Ke6 41. c3 Kd7 42. Bb8 Bd2 43. b4 cxb4 44. cxb4 Bxb4 45. Ba7 Bc5 0-1

[Event "BRA Amateur-ch U1800"]
[Site "Sao Paulo"]
[Date "2022.11.04"]
[Round "4"]
[White "Yokomizo, Wilton"]
[Black "Sakai, Erik Oneda"]
[Result "0-1"]
[ECO "B27"]
[WhiteElo "1434"]
[BlackElo "1712"]
[PlyCount "136"]
[EventDate "2022.11.03"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 211 Extra"]
[Source "ChessBase"]
[SourceDate "2023.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.01.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Qxd4 Nf6 5. e5 Nc6 6. Qc4 d5 7. exd6 Qxd6 8. Bf4 Qe6+ 9. Be2 Bg7 10. Ng5 Qxc4 11. Bxc4 0-0 12. c3 h6 13. Nf3 Na5 14. Be2 Nd5 15. Bg3 Bf5 16. 0-0 Rac8 17. Be5 f6 18. Bd4 Nf4 19. Re1 Nxe2+ 20. Rxe2 Nc6 21. Bc5 Rfe8 22. Nbd2 b6 23. Ba3 e5 24. Nh4 Bd3 25. Re3 Rcd8 26. Rae1 g5 27. Nhf3 f5 28. Nd4 Nxd4 29. cxd4 Rxd4 30. Nf3 Rd5 31. Rc1 Rd7 32. Ne1 Bb5 33. Rec3 Bf8 34. Bxf8 Kxf8 35. b3 e4 36. a4 Ba6 37. b4 Be2 38. Re3 Rd1 39. Rxd1 Bxd1 40. a5 bxa5 41. bxa5 f4 42. Rc3 Re7 43. Rc6 Kg7 44. Kf1 Ba4 45. Rc5 a6 46. Nc2 Bxc2 47. Rxc2 Kf6 48. Rc6+ Re6 49. Rb6 Ke5 50. Rb4 Rd6 51. Ke2 Kd5 52. Rb2 Kc4 53. Rb6 Kc5 54. Rb2 Kd5 55. g3 Ke5 56. Rb4 Rd5 57. f3 e3 58. gxf4+ gxf4 59. h4 Rxa5 60. Rb6 Ra2+ 61. Ke1 Rf2 62. Rxa6 Rxf3 63. Rxh6 Rh3 64. Ke2 Ke4 65. Re6+ Kf5 66. Rh6 Rh2+ 67. Kf1 f3 68. Rh8 Rh1# 0-1

[Event "BRA Amateur-ch U1800"]
[Site "Sao Paulo"]
[Date "2022.11.03"]
[Round "1"]
[White "Sakai, Erik Oneda"]
[Black "Bastos, Ricardo Alves"]
[Result "1/2-1/2"]
[ECO "A17"]
[WhiteElo "1712"]
[BlackElo "1415"]
[PlyCount "111"]
[EventDate "2022.11.03"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 211 Extra"]
[Source "ChessBase"]
[SourceDate "2023.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.01.31"]
[SourceQuality "1"]

1. Nf3 b6 2. c4 Bb7 3. Nc3 e6 4. g3 Nf6 5. Bg2 Bb4 6. 0-0 0-0 7. a3 Bxc3 8. bxc3 Nc6 9. Rb1 Qe7 10. d3 Rfd8 11. Nd4 h6 12. Qa4 Nxd4 13. Bxb7 Nxe2+ 14. Kg2 Nxc3 15. Qb3 Nxb1 16. Bxa8 Rxa8 17. Qxb1 d5 18. Re1 dxc4 19. dxc4 Rd8 20. Bb2 Qc5 21. Qc1 Ng4 22. Qf4 Qf5 23. Qxf5 exf5 24. h3 Rd2 25. Re8+ Kh7 26. hxg4 Rxb2 27. Re7 Ra2 28. gxf5 f6 29. Rxc7 Rxa3 30. c5 bxc5 31. Rxc5 a5 32. Rc2 a4 33. Kf1 Ra1+ 34. Ke2 a3 35. Kd2 h5 36. Kc3 Kh6 37. Kb3 Kg5 38. Rc7 Kxf5 39. Rxg7 Rf1 40. f4 Rf3+ 41. Ka2 Ke4 42. Re7+ Kf5 43. Rg7 Rd3 44. Rg8 Ke4 45. Rg6 f5 46. Rg5 h4 47. gxh4 Kxf4 48. Rg8 Kf3 49. h5 f4 50. h6 Rd2+ 51. Kxa3 Rh2 52. Rh8 Kf2 53. h7 f3 54. Kb3 Kf1 55. Kc3 f2 56. Kd2 1/2-1/2

[Event "BRA Amateur-ch U1800"]
[Site "Sao Paulo"]
[Date "2022.11.03"]
[Round "2"]
[White "Spieker, Otavio Schmidt"]
[Black "Sakai, Erik Oneda"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "1205"]
[BlackElo "1712"]
[PlyCount "87"]
[EventDate "2022.11.03"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 211 Extra"]
[Source "ChessBase"]
[SourceDate "2023.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.01.31"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 g6 3. f4 Bg7 4. Nf3 Nc6 5. Bc4 e6 6. d3 Nge7 7. 0-0 0-0 8. Qe1 d5 9. Bb3 Nd4 10. Nxd4 Bxd4+ 11. Kh1 Nc6 12. a4 dxe4 13. dxe4 Qe7 14. Qg3 f5 15. e5 Bxc3 16. Qxc3 Rd8 17. Be3 b6 18. Rfd1 Ba6 19. Bf2 Rxd1+ 20. Rxd1 Rd8 21. Rxd8+ Nxd8 22. Qd2 Kf7 23. a5 c4 24. Ba2 b5 25. Bxa7 Qxa7 26. Qxd8 Qb7 27. Qf6+ Kg8 28. Qxe6+ Kg7 29. Qf6+ Kh6 30. h3 Qe4 31. Qxa6 Qxf4 32. Qb6 Qc1+ 33. Qg1 Qxb2 34. e6 Qa3 35. Qe1 Qe7 36. a6 Kg7 37. a7 Qe8 38. Qe5+ Kh6 39. Qb8 Qxe6 40. a8Q Qe1+ 41. Kh2 g5 42. Qd6+ Kh5 43. Qf3+ g4 44. Qxf5+ 1-0

[Event "BRA-ch Amateur U2000"]
[Site "Sao Paulo"]
[Date "2018.06.02"]
[Round "5"]
[White "Dias, Joao Batista de Sou"]
[Black "Sakai, Erik Oneda"]
[Result "1-0"]
[ECO "A87"]
[WhiteElo "1852"]
[BlackElo "1693"]
[PlyCount "56"]
[EventDate "2018.05.31"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. g3 f5 2. Bg2 Nf6 3. d4 g6 4. c4 Bg7 5. Nf3 0-0 6. e3 d6 7. 0-0 Nc6 8. Qb3 Kh8 9. Nc3 Rb8 10. Bd2 e5 11. dxe5 Nxe5 12. Nxe5 dxe5 13. Rad1 Qe7 14. Nd5 Qf7 15. Bb4 Re8 16. Nxc7 Be6 17. Nxe6 Qxe6 18. Rd6 Qf7 19. Rfd1 b5 20. c5 Qxb3 21. axb3 Rbc8 22. Ra6 Rc7 23. c6 Rec8 24. Ba5 Rf7 25. c7 Rd7 26. Rxd7 Nxd7 27. Bb7 Nc5 28. Bxc8 Nxa6 1-0

[Event "BRA-ch Amateur U2000"]
[Site "Sao Paulo"]
[Date "2018.06.02"]
[Round "6"]
[White "Sakai, Erik Oneda"]
[Black "Vieira, Alexandre Letizio"]
[Result "1/2-1/2"]
[ECO "A30"]
[WhiteElo "1693"]
[BlackElo "1817"]
[PlyCount "86"]
[EventDate "2018.05.31"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c5 3. g3 d5 4. b3 g6 5. Bb2 Bg7 6. cxd5 Qxd5 7. Nc3 Qd8 8. Ne4 b6 9. Nxf6+ exf6 10. Bg2 Bb7 11. 0-0 Nc6 12. e3 0-0 13. d4 f5 14. Rb1 Rb8 15. dxc5 Qxd1 16. Rfxd1 Bxb2 17. Rxb2 Rfd8 18. Rbd2 Rxd2 19. Rxd2 bxc5 20. Ne1 Rd8 21. Rxd8+ Nxd8 22. Nd3 Bxg2 23. Kxg2 Ne6 24. Kf3 f6 25. h4 Kf7 26. e4 Ke7 27. exf5 gxf5 28. Ke3 Kd6 29. Nf4 Nd4 30. Kd3 Nf3 31. Nh5 Ne5+ 32. Kc3 Ng4 33. f3 Ne5 34. Nxf6 Nxf3 35. Nxh7 Nd4 36. Kd3 Nc6 37. a3 Ne5+ 38. Kc3 Nf3 39. Nf6 f4 40. gxf4 Nxh4 41. Kc4 Ng2 42. Ne4+ Kc6 43. f5 Ne3+ 1/2-1/2

[Event "BRA-ch Amateur U2000"]
[Site "Sao Paulo"]
[Date "2018.06.01"]
[Round "3"]
[White "Cifuentes Goncalves, Luiz Osvaldo"]
[Black "Sakai, Erik Oneda"]
[Result "0-1"]
[ECO "B38"]
[WhiteElo "1839"]
[BlackElo "1693"]
[PlyCount "104"]
[EventDate "2018.05.31"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 cxd4 5. Nxd4 Nc6 6. Nc2 Nf6 7. Nc3 d6 8. Be2 0-0 9. 0-0 Be6 10. Be3 Ne5 11. b3 Nc6 12. Nd4 Nxd4 13. Bxd4 Qa5 14. Rc1 Rfc8 15. a4 h5 16. h3 Qg5 17. f4 Qh4 18. Rf3 Nh7 19. Bxg7 Kxg7 20. f5 Bd7 21. Kh2 Qf6 22. fxg6 Qe5+ 23. Kh1 fxg6 24. Qc2 Rf8 25. Rcf1 Rxf3 26. Rxf3 Rf8 27. Nd5 Rxf3 28. Bxf3 Ng5 29. Qe2 Nxf3 30. Qxf3 Bc6 31. Kg1 e6 32. Nc3 Qd4+ 33. Kf1 Qf6 34. Ke2 Qxf3+ 35. Kxf3 Kf6 36. h4 g5 37. g3 a5 38. Ke3 gxh4 39. gxh4 Ke5 40. Nb5 d5 41. exd5 exd5 42. Nd4 dxc4 43. Nxc6+ bxc6 44. bxc4 c5 45. Kf3 Kd4 46. Kf4 Kxc4 47. Kg5 Kb4 48. Kxh5 c4 49. Kg6 c3 50. h5 c2 51. h6 c1Q 52. h7 Qc2+ 0-1

[Event "BRA-ch Amateur U2000"]
[Site "Sao Paulo"]
[Date "2018.06.01"]
[Round "4"]
[White "Sakai, Erik Oneda"]
[Black "Baptista, Andre Kemper"]
[Result "0-1"]
[ECO "E60"]
[WhiteElo "1693"]
[BlackElo "1926"]
[PlyCount "132"]
[EventDate "2018.05.31"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 d6 3. d4 g6 4. b3 Bg7 5. Bb2 0-0 6. g3 c5 7. d5 Na6 8. Bg2 Bf5 9. a3 Qd7 10. h3 b5 11. Nbd2 Qb7 12. Nh4 Bd7 13. Rb1 Rab8 14. 0-0 h6 15. e4 Qc8 16. Kh2 bxc4 17. bxc4 Ng4+ 18. hxg4 Rxb2 19. Rxb2 Bxb2 20. Qb3 Bg7 21. f3 Qc7 22. Rb1 Rb8 23. Qc2 e6 24. Rxb8+ Qxb8 25. dxe6 Bxe6 26. Nb3 Qe8 27. Nd2 Bd7 28. Qb3 Qb8 29. Qxb8+ Nxb8 30. Bf1 Bb2 31. Nb1 Ba4 32. Bd3 Bd1 33. Kg2 Nc6 34. Kf2 Ne5 35. Ke3 Bc1+ 36. Nd2 Bxa3 37. Be2 Bxe2 38. Kxe2 Bc1 39. f4 Nxg4 40. Nhf3 Bxd2 41. Kxd2 Nf2 42. Ke3 Nd1+ 43. Kd2 Nb2 44. Kc3 Na4+ 45. Kb3 Nb6 46. e5 Nc8 47. exd6 Nxd6 48. Ne5 h5 49. Nd7 Ne4 50. Ka4 Nxg3 51. Nxc5 h4 52. Nd7 Ne4 53. Ne5 Kf8 54. Nf3 h3 55. Kb5 Ke7 56. Ka6 Kd6 57. Kxa7 Kc5 58. Kb7 Kxc4 59. Kc6 g5 60. fxg5 Nxg5 61. Nh2 f5 62. Kd6 Kd4 63. Ke7 f4 64. Ng4 Ke4 65. Kd6 Kf3 66. Ne5+ Kg3 0-1

[Event "BRA-ch Amateur U2000"]
[Site "Sao Paulo"]
[Date "2018.05.31"]
[Round "2"]
[White "De Carvalho, Igor Lorenzon"]
[Black "Sakai, Erik Oneda"]
[Result "1-0"]
[ECO "A21"]
[WhiteElo "1953"]
[BlackElo "1693"]
[PlyCount "131"]
[EventDate "2018.05.31"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. c4 f5 2. g3 g6 3. Bg2 Nf6 4. Nf3 Bg7 5. Nc3 0-0 6. 0-0 d6 7. d3 e5 8. Rb1 a5 9. a3 c6 10. b4 axb4 11. axb4 Qe7 12. b5 Bd7 13. Qb3 h6 14. bxc6 Bxc6 15. Nd5 Qf7 16. Nd2 Na6 17. Nxf6+ Bxf6 18. Qb6 Bd8 19. Qb2 Bxg2 20. Kxg2 Nc5 21. Nb3 Na4 22. Qd2 Bg5 23. Qb4 Qc7 24. Bxg5 hxg5 25. Ra1 b6 26. Rfb1 Nc5 27. Rxa8 Rxa8 28. Nxc5 bxc5 29. Qb7 Ra7 30. Qd5+ Kg7 31. h3 Qd7 32. Rb6 Qc7 33. Rxd6 Qb7 34. Qxb7+ Rxb7 35. Rd5 Kf6 36. Rxc5 Rb2 37. e3 Rd2 38. Rd5 Ke6 39. Rd8 Ke7 40. Rd5 Ke6 41. g4 Rd1 42. Rd8 f4 43. c5 Rc1 44. d4 e4 45. Re8+ Kd5 46. Re5+ Kc4 47. Rxe4 Kd3 48. Re6 fxe3 49. fxe3 Rc2+ 50. Kg3 Rc1 51. Rxg6 Kxe3 52. Rxg5 Kxd4 53. h4 Ke4 54. h5 Rc3+ 55. Kh4 Rc1 56. Rf5 Rc3 57. h6 Rc1 58. Rh5 Kf4 59. Rf5+ Ke4 60. Kg5 Rh1 61. Kg6 Rh4 62. g5 Rh1 63. Rf6 Kd5 64. c6 Ke5 65. h7 Rh3 66. c7 1-0

[Event "Sao Paulo op-B U2050 7th"]
[Site "Sao Paulo"]
[Date "2018.04.01"]
[Round "5"]
[White "Bueno, Jonas Alves"]
[Black "Sakai, Erik Oneda"]
[Result "1-0"]
[ECO "A85"]
[WhiteElo "1873"]
[PlyCount "84"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. d4 f5 2. c4 g6 3. Nc3 Nf6 4. e4 fxe4 5. Bg5 b6 6. Bxf6 exf6 7. Nxe4 Bb4+ 8. Nc3 0-0 9. Bd3 Re8+ 10. Nge2 Bxc3+ 11. bxc3 Bb7 12. 0-0 d6 13. h4 f5 14. g3 Be4 15. Nf4 Nd7 16. Re1 Nf6 17. f3 Bxd3 18. Qxd3 Qd7 19. d5 Rxe1+ 20. Rxe1 Re8 21. Ne6 Nh5 22. Kf2 Ng7 23. Nf4 Rxe1 24. Kxe1 Qe7+ 25. Kf2 Kf7 26. Qe3 Qd7 27. Qe2 Qa4 28. Ke3 Qa3 29. Kd3 Qc1 30. Ne6 Qb1+ 31. Kd4 Qg1+ 32. Kd3 Qb1+ 33. Kd4 c5+ 34. dxc6 Nxe6+ 35. Kd5 Nc7+ 36. Kxd6 Ne8+ 37. Kd7 Nf6+ 38. Kd8 Qc1 39. Qe7+ Kg8 40. Qxf6 Qd2+ 41. Ke7 h5 42. Qxg6+ Kh8 1-0

[Event "Sao Paulo op-B U2050 7th"]
[Site "Sao Paulo"]
[Date "2018.04.01"]
[Round "6"]
[White "Passos Coutinho, Eduardo"]
[Black "Sakai, Erik Oneda"]
[Result "1/2-1/2"]
[ECO "A08"]
[WhiteElo "1678"]
[PlyCount "91"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. g3 Bg7 4. Bg2 Nc6 5. 0-0 Nf6 6. d3 0-0 7. Nbd2 d5 8. Re1 dxe4 9. Nxe4 Nxe4 10. Rxe4 b6 11. Rb1 Bb7 12. a3 Rc8 13. Bf4 Nd4 14. Re1 Bxf3 15. Bxf3 Nxf3+ 16. Qxf3 Qd7 17. Be5 Bxe5 18. Rxe5 f6 19. Qd5+ Qxd5 20. Rxd5 Rcd8 21. Rxd8 Rxd8 22. Re1 Kf7 23. Re4 e5 24. Kg2 h5 25. f4 exf4 26. Rxf4 Re8 27. Kf2 f5 28. h3 Kf6 29. Rf3 g5 30. Re3 Rxe3 31. Kxe3 Ke5 32. c3 a5 33. a4 Kd5 34. Kf3 Kc6 35. Ke3 b5 36. axb5+ Kxb5 37. d4 Kc4 38. b3+ Kxb3 39. dxc5 a4 40. c6 a3 41. c7 a2 42. c8Q a1Q 43. Qxf5 Qe1+ 44. Kd4 Qxc3+ 45. Ke4 Qe1+ 46. Kf3 1/2-1/2

[Event "Sao Paulo op-B U2050 7th"]
[Site "Sao Paulo"]
[Date "2018.03.31"]
[Round "3"]
[White "Ramillo, Vitoria Matheus"]
[Black "Sakai, Erik Oneda"]
[Result "0-1"]
[ECO "B76"]
[WhiteElo "1860"]
[PlyCount "120"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Bg7 5. Nc3 Nc6 6. Be3 d6 7. Qd2 Nxd4 8. Bxd4 Nf6 9. 0-0-0 0-0 10. f3 Be6 11. Kb1 a6 12. g4 Qc7 13. h4 Rac8 14. h5 Bxg4 15. Bxf6 Bxf3 16. Bxg7 Bxh1 17. Bxf8 Rxf8 18. hxg6 fxg6 19. Qd5+ Kg7 20. Qd4+ e5 21. Qe3 Bf3 22. Re1 Bg4 23. Nd5 Qf7 24. Bh3 Bxh3 25. Qxh3 h5 26. b3 Qf2 27. Qc3 Rc8 28. Qxc8 Qxe1+ 29. Kb2 Qxe4 30. Qe6 h4 31. Qf6+ Kh6 32. Qh8+ Kg5 33. Qf6+ Kg4 34. Qxd6 Kg3 35. Nc3 Qf5 36. Ne2+ Kg4 37. Qb4+ e4 38. Qe1 Qe5+ 39. c3 Qh2 40. Ka3 Qg2 41. Qd1 Qf3 42. Qd7+ Qf5 43. Qd1 Kg5 44. Qg1+ Kh5 45. Qh2 Qg4 46. Qe5+ Qf5 47. Qh2 Qc5+ 48. Kb2 Qe3 49. Qe5+ g5 50. Qe8+ Kg4 51. Qe6+ Kf3 52. Nd4+ Kg2 53. Qg4+ Kf2 54. Qf5+ Qf4 55. Qc5 Kg2 56. Nc2 Kh2 57. Qc4 Qf3 58. Ka3 b5 59. Qd4 g4 60. Ne1 Qe2 0-1

[Event "Sao Paulo op-B U2050 7th"]
[Site "Sao Paulo"]
[Date "2018.03.31"]
[Round "4"]
[White "Sakai, Erik Oneda"]
[Black "Felix, Raimundo Nascimento"]
[Result "0-1"]
[ECO "E60"]
[BlackElo "1922"]
[PlyCount "38"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 d6 3. d4 g6 4. g3 b6 5. Bg2 Bb7 6. 0-0 Nbd7 7. Nc3 Bg7 8. b3 0-0 9. Bb2 Ne4 10. Qc2 Nxc3 11. Bxc3 Nf6 12. d5 e5 13. Nd2 Nh5 14. e4 Bc8 15. b4 f5 16. f3 Bh6 17. Nb3 Be3+ 18. Kh1 Qg5 19. Bd2 Nxg3+ 0-1

[Event "Sao Paulo op-B U2050 7th"]
[Site "Sao Paulo"]
[Date "2018.03.30"]
[Round "2"]
[White "Sakai, Erik Oneda"]
[Black "Cardozo, Matheus Santos"]
[Result "0-1"]
[ECO "A38"]
[BlackElo "1875"]
[PlyCount "110"]
[EventDate "2018.03.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 g6 3. b3 Bg7 4. Nc3 Nf6 5. Bb2 0-0 6. g3 Nc6 7. Bg2 d6 8. 0-0 Bf5 9. Nd5 Nxd5 10. Bxg7 Kxg7 11. cxd5 Nb4 12. d3 Qd7 13. a3 Na6 14. Qd2 Bh3 15. Rfc1 Bxg2 16. Kxg2 Nc7 17. e4 Rac8 18. d4 Na6 19. Rc3 b6 20. Rac1 Rfd8 21. Qd3 Qb7 22. Nd2 Kg8 23. Nc4 Nc7 24. dxc5 dxc5 25. a4 Ne6 26. Qe3 Nd4 27. Nd2 f5 28. f3 Rf8 29. b4 fxe4 30. fxe4 Qa6 31. Rc4 e5 32. dxe6 Nxe6 33. Qb3 Rf7 34. b5 Qb7 35. R4c3 Nd4 36. Qc4 Rcf8 37. Rf1 Kg7 38. Rxf7+ Qxf7 39. Qxf7+ Rxf7 40. Nc4 Re7 41. Re3 Nc2 42. Re2 Nd4 43. Re3 Ne6 44. h4 Nd4 45. e5 Kf7 46. Re1 Ke6 47. g4 Rf7 48. Nd6 Rf4 49. Kg3 Rf3+ 50. Kg2 Ra3 51. Ne4 Ra2+ 52. Kg3 Ra3+ 53. Kf4 h6 54. g5 Rf3+ 55. Kg4 h5# 0-1

[Event "BRA-ch Amateur U2000"]
[Site "Sao Paulo"]
[Date "2018.??.??"]
[Round "1"]
[White "Sakai, Erik Oneda"]
[Black "Mota, Romulo Rodrigues"]
[Result "1/2-1/2"]
[ECO "A90"]
[WhiteElo "1693"]
[BlackElo "1928"]
[PlyCount "149"]
[EventDate "2018.05.31"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. Nf3 e6 2. c4 d5 3. b3 c6 4. Bb2 f5 5. g3 Nf6 6. Bg2 Bd6 7. 0-0 0-0 8. d4 Nbd7 9. c5 Bc7 10. b4 a5 11. a3 Ne4 12. Nbd2 Ndf6 13. Ne5 Bxe5 14. dxe5 Ng4 15. Bd4 axb4 16. Nxe4 fxe4 17. axb4 Rxa1 18. Qxa1 Qg5 19. f3 exf3 20. exf3 Nh6 21. f4 Qg6 22. Qb1 Nf5 23. Bf2 Bd7 24. Qa1 Qf7 25. Bh3 Be8 26. Bxf5 Qxf5 27. Qb1 Qg4 28. Qd1 Rxf4 29. Qxg4 Rxg4 30. Be1 Re4 31. Bc3 d4 32. Re1 Rg4 33. Bd2 g5 34. Kf2 d3 35. h3 Rc4 36. Rc1 Rd4 37. Ke3 Rd5 38. Bc3 Bg6 39. Rd1 h5 40. Rd2 Rd8 41. Ra2 Rf8 42. Rf2 Ra8 43. Rf6 Bf5 44. g4 hxg4 45. hxg4 Bxg4 46. Rg6+ Kh7 47. Rxg5 Bf5 48. Rg2 Ra3 49. Bd2 Ra2 50. Rh2+ Kg6 51. Rh8 Kf7 52. Rb8 Ra7 53. Kd4 Ke7 54. Kc4 Kd7 55. Rg8 Ra2 56. Rg7+ Kc8 57. Rg8+ Kc7 58. Rg7+ Kb8 59. Rg2 Rc2+ 60. Kd4 Ka7 61. Ke3 Rc4 62. Rf2 Ka6 63. Rf4 Rc2 64. Rf1 Kb5 65. Ra1 b6 66. cxb6 Kxb6 67. Rc1 Ra2 68. Rc5 Rb2 69. Rc4 Ra2 70. Rc5 Ra8 71. Ra5 Rh8 72. Kd4 Rh2 73. Kc3 Re2 74. Rc5 Re4 75. Ra5 1/2-1/2

[Event "Sao Roque InterUSP 29th"]
[Site "Sao Paulo"]
[Date "2013.05.30"]
[Round "1.4"]
[White "Cirilo, Guilherme de Araujo"]
[Black "Sakai, Erik Oneda"]
[Result "1-0"]
[ECO "A01"]
[WhiteElo "1898"]
[PlyCount "99"]
[EventDate "2013.05.30"]
[EventType "team-k.o."]
[EventRounds "3"]
[EventCountry "BRA"]
[SourceTitle "EXT 2015"]
[Source "ChessBase"]
[SourceDate "2014.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2014.11.20"]
[SourceQuality "1"]
[WhiteTeam "Politecnica"]
[BlackTeam "Pinheiros"]
[WhiteTeamCountry "BRA"]
[BlackTeamCountry "BRA"]

1. b3 f5 2. Bb2 Nf6 3. e3 d6 4. d4 g6 5. h4 Bg7 6. Be2 h6 7. Nh3 Be6 8. Nd2 Bf7 9. c4 Nbd7 10. Qc2 e6 11. 0-0-0 0-0 12. e4 Nh7 13. g4 fxg4 14. Bxg4 h5 15. Be2 Qxh4 16. Rdg1 Qe7 17. Nf4 Qe8 18. Qd3 e5 19. Nxh5 gxh5 20. Qg3 Bg6 21. Bxh5 Rf6 22. Rh4 Ndf8 23. Rg4 Re6 24. f4 exf4 25. Qxf4 Nf6 26. Bxg6 Nxg6 27. Rxg6 Nh5 28. Rxg7+ Nxg7 29. d5 Rg6 30. Rh1 Qe7 31. Qh2 Rf8 32. Qh7+ Kf7 33. Rf1+ Rf6 34. Rxf6+ Qxf6 35. Bxf6 Kxf6 36. e5+ dxe5 37. Ne4+ Ke7 38. Qxg7+ Rf7 39. Qxe5+ Kf8 40. Ng5 Rd7 41. Ne6+ Kg8 42. Kd2 c6 43. Ke3 Rf7 44. d6 Rh7 45. Kf4 Rh4+ 46. Kg5 Rh7 47. Kg6 Re7 48. Qg7+ Rxg7+ 49. Nxg7 Kf8 50. Kf6 1-0

