[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.30"]
[Round "9"]
[White "Araoz Andrade, Ivan Alexander"]
[Black "Lema, Mao"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "1647"]
[BlackElo "1476"]
[PlyCount "97"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 Bd7 7. f3 Qc7 8. Qd2 Nc6 9. 0-0-0 b5 10. Kb1 Ne5 11. Bd3 Nc4 12. Bxc4 Qxc4 13. Qd3 Qxd3 14. Rxd3 g6 15. g4 b4 16. Nce2 Bg7 17. Ng3 h5 18. g5 Nh7 19. h4 0-0 20. f4 Bg4 21. Nc6 Rfe8 22. Nxb4 Rab8 23. Rb3 Be6 24. Nd5 Bxd5 25. exd5 a5 26. Rd1 a4 27. Rxb8 Rxb8 28. Bd4 Nf8 29. Bxg7 Kxg7 30. Rd4 a3 31. b3 Nd7 32. Ne4 Rc8 33. Kc1 Nb6 34. Kd2 Ra8 35. Kd3 Ra5 36. c4 Ra8 37. Nc3 Nd7 38. b4 Rb8 39. Nb5 Ra8 40. Kc3 f6 41. gxf6+ Kxf6 42. Re4 Rc8 43. Re6+ Kf7 44. Kd4 Ra8 45. Re3 Ra4 46. Kc3 Nb6 47. Nd4 Ra7 48. Nc6 Rc7 49. Kd4 1-0

[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.29"]
[Round "7"]
[White "Lema, Mao"]
[Black "Andrade Puente, Robinson Steven"]
[Result "0-1"]
[ECO "A57"]
[WhiteElo "1476"]
[BlackElo "1547"]
[PlyCount "52"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. d4 Nf6 2. b3 g6 3. Bb2 Bg7 4. c4 c5 5. d5 b5 6. Nd2 0-0 7. e4 bxc4 8. Bxc4 Qa5 9. f3 d6 10. Qc2 Nbd7 11. Bc3 Qd8 12. g4 Nb6 13. Qb2 e5 14. dxe6 fxe6 15. 0-0-0 d5 16. exd5 exd5 17. Ne4 Nxc4 18. bxc4 d4 19. Nxc5 dxc3 20. Qe2 Qb6 21. Nb3 a5 22. c5 Qb4 23. Rd4 Qa3+ 24. Kd1 a4 25. Na1 Qb2 26. Nc2 Qb1# 0-1

[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.28"]
[Round "6"]
[White "Caceres Limones, Danilo"]
[Black "Lema, Mao"]
[Result "1-0"]
[ECO "B22"]
[WhiteElo "1601"]
[BlackElo "1476"]
[PlyCount "89"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 c5 2. c3 d6 3. d4 cxd4 4. cxd4 Nf6 5. Nc3 a6 6. Be2 Nc6 7. Nf3 Bg4 8. 0-0 Bxf3 9. Bxf3 Rc8 10. Re1 g6 11. e5 dxe5 12. dxe5 Qxd1 13. Rxd1 Nd7 14. e6 fxe6 15. Bg4 Nd8 16. Be3 Bg7 17. Bd4 Bxd4 18. Rxd4 Ne5 19. Bh3 Rc4 20. Rd2 Kf7 21. Re1 Ndc6 22. Ne4 Rd4 23. Rxd4 Nxd4 24. Ng5+ Kf6 25. Rxe5 Kxe5 26. Nf7+ Kf6 27. Nxh8 Kg7 28. Nxg6 Kxg6 29. Kf1 Kf6 30. Ke1 h5 31. Kd2 Ke5 32. Kd3 b6 33. f4+ Kd5 34. g4 hxg4 35. Bg2+ Nf3 36. Bxf3+ gxf3 37. Ke3 e5 38. Kxf3 exf4 39. Kxf4 b5 40. h4 Ke6 41. b4 Kf6 42. h5 Kg7 43. Kg5 e6 44. a3 e5 45. Kf5 1-0

[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.27"]
[Round "5"]
[White "Lema, Mao"]
[Black "Obaco Cuenca, Dalthon Farid"]
[Result "1-0"]
[ECO "A45"]
[WhiteElo "1476"]
[PlyCount "73"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 g6 3. Bxf6 exf6 4. Nf3 d5 5. c4 Bb4+ 6. Nbd2 0-0 7. e3 Re8 8. Qb3 Bxd2+ 9. Nxd2 Be6 10. Qxb7 Nd7 11. cxd5 Rb8 12. Qc6 Rb6 13. Qc4 Rc6 14. Qxc6 Nb8 15. Qc3 Bxd5 16. 0-0-0 Re6 17. Kb1 Rc6 18. Qd3 Na6 19. Qa3 Qc8 20. e4 Bxe4+ 21. Nxe4 Qf5 22. Bd3 Qf4 23. Rhe1 Re6 24. Nxf6+ Qxf6 25. Rxe6 Qxe6 26. Qxa6 Qg4 27. Re1 Qxd4 28. f3 Qf2 29. Re2 Qg1+ 30. Kc2 Qxh2 31. Qf6 Qd6 32. Re8+ Qf8 33. Rxf8+ Kxf8 34. Bc4 Ke8 35. Qxf7+ Kd8 36. Be6 c6 37. Qd7# 1-0

[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.27"]
[Round "4"]
[White "Villarroel Escobar, Marco Sebastian"]
[Black "Lema, Mao"]
[Result "1-0"]
[ECO "B19"]
[WhiteElo "1454"]
[BlackElo "1476"]
[PlyCount "105"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 e6 11. Bf4 Ngf6 12. 0-0-0 Qa5 13. Kb1 0-0-0 14. Qe2 Nd5 15. Bd2 Qb6 16. c4 Ba3 17. b3 N5f6 18. c5 Qb5 19. Qxb5 cxb5 20. Kc2 Nd5 21. Ne4 Rhf8 22. Nd6+ Kb8 23. Nxb5 Bb4 24. a3 a6 25. Nc3 Bxc3 26. Bxc3 N7f6 27. Rh4 Kc8 28. Ne5 Nd7 29. Nc4 Nxc3 30. Kxc3 Nxc5 31. Rc1 Nd7 32. Ne5 Nxe5 33. dxe5 Rd5 34. Rc4+ Kb8 35. f4 Rfd8 36. Rc2 b5 37. Rc6 Rc8 38. Rxc8+ Kxc8 39. Rd2 Rxd2 40. Kxd2 Kd7 41. Kd3 Kc6 42. Kd4 a5 43. g4 Kb6 44. f5 Kc6 45. b4 a4 46. f6 gxf6 47. exf6 Kd6 48. g5 e5+ 49. Ke4 Ke6 50. gxh6 Kxf6 51. h7 Kg7 52. Kxe5 Kxh7 53. Kf6 1-0

[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.26"]
[Round "3"]
[White "Lema, Mao"]
[Black "Matute Moncada, Israel"]
[Result "1/2-1/2"]
[ECO "A85"]
[WhiteElo "1476"]
[BlackElo "1713"]
[PlyCount "43"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 f5 3. c4 Nf6 4. Nc3 d5 5. e3 c6 6. Bd2 Bd6 7. Rc1 Nbd7 8. cxd5 exd5 9. Bd3 Ne4 10. a3 a5 11. Ne2 Qe7 12. Ng3 0-0 13. 0-0 Ndf6 14. Ne1 Nxd2 15. Qxd2 Ne4 16. Bxe4 fxe4 17. f4 exf3 18. gxf3 Bh3 19. Ng2 Bxg3 20. hxg3 Qg5 21. Qf2 Rae8 22. Rfe1 1/2-1/2

[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.26"]
[Round "2"]
[White "Noboa Silva, Kevin Omar"]
[Black "Lema, Mao"]
[Result "1-0"]
[ECO "B14"]
[WhiteElo "2197"]
[BlackElo "1476"]
[PlyCount "67"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 e6 5. Nc3 Nf6 6. Nf3 Nbd7 7. cxd5 exd5 8. Bd3 Be7 9. 0-0 0-0 10. h3 Re8 11. Bf4 a6 12. Rc1 Nf8 13. Re1 Ne6 14. Bh2 Bd7 15. Bb1 Bb4 16. Ne5 Bxc3 17. Rxc3 Rc8 18. Nxd7 Nxd7 19. Rce3 g6 20. a3 Qb6 21. Ba2 Qxb2 22. Bxd5 Rc2 23. Bxe6 Rxe6 24. Rxe6 fxe6 25. Bg3 Nf8 26. Qf3 Rc1 27. Rxc1 Qxc1+ 28. Kh2 Qc6 29. Qf6 Nd7 30. Qe7 h6 31. Bd6 g5 32. Qxe6+ Kh7 33. d5 Qb5 34. Bb4 1-0

[Event "South America-ch U20 13th"]
[Site "Manta"]
[Date "2017.04.25"]
[Round "1"]
[White "Lema, Mao"]
[Black "Mendoza Criollo, Carlos David"]
[Result "1/2-1/2"]
[ECO "A48"]
[WhiteElo "1476"]
[BlackElo "1948"]
[PlyCount "64"]
[EventDate "2017.04.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ECU"]
[SourceTitle "CBM 178 Extra"]
[Source "ChessBase"]
[SourceDate "2017.06.22"]
[SourceVersion "1"]
[SourceVersionDate "2017.06.22"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 Ne4 3. Bf4 d5 4. Nf3 g6 5. Nbd2 Bg7 6. e3 Bf5 7. c4 c6 8. Qb3 Nxd2 9. Nxd2 Qd7 10. cxd5 0-0 11. dxc6 Qxc6 12. Bxb8 Raxb8 13. Nf3 Be4 14. Be2 Rfc8 15. 0-0 e6 16. Ne1 e5 17. dxe5 Bxe5 18. Bf3 a5 19. Bxe4 Qxe4 20. Rd1 a4 21. Qb5 Bg7 22. Nf3 Qc4 23. Qxc4 Rxc4 24. Rd2 Rbc8 25. Ne1 b5 26. Nd3 Rc2 27. Rfd1 b4 28. Kf1 R8c4 29. Ke2 Bf6 30. Nf4 b3 31. axb3 axb3 32. Nd3 Bd8 1/2-1/2

