[Event "South America-ch U12 16th"]
[Site "Buenos Aires"]
[Date "2019.12.03"]
[Round "4.5"]
[White "Matvyeyev, Alexander"]
[Black "Leon Acevedo, Juan Alejandro"]
[Result "0-1"]
[ECO "B35"]
[WhiteElo "1524"]
[BlackElo "1790"]
[PlyCount "80"]
[EventDate "2019.12.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ARG"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Bc4 0-0 8. Qd2 Ng4 9. h3 Nxe3 10. fxe3 Nc6 11. 0-0-0 Qb6 12. Nd5 Qd8 13. Rhf1 Ne5 14. Bb3 Bd7 15. Nf3 b5 16. Qf2 Nc4 17. c3 e6 18. Nf4 Qb6 19. Bxc4 bxc4 20. Rd2 Rab8 21. Kd1 Qc6 22. Ke2 Qxe4 23. Qh4 Qc6 24. Rfd1 d5 25. g4 Qd6 26. g5 Rb5 27. Nh2 f5 28. Nf3 Rfb8 29. Qf2 Rxb2 30. Rxb2 Rxb2+ 31. Rd2 Bxc3 32. Rxb2 Bxb2 33. Qe1 e5 34. Ng2 Qa3 35. Qd2 Bb5 36. Nxe5 Qc3 37. Nf3 Qb4 38. Qd1 c3+ 39. Kf2 Qc4 40. Nf4 c2 0-1

[Event "South America-ch U12 16th"]
[Site "Buenos Aires"]
[Date "2019.12.02"]
[Round "3.4"]
[White "Barja Viveros, Matias Ariel"]
[Black "Matvyeyev, Alexander"]
[Result "1/2-1/2"]
[ECO "C01"]
[WhiteElo "1640"]
[BlackElo "1524"]
[PlyCount "38"]
[EventDate "2019.12.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ARG"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Bd6 5. Bd3 Nf6 6. 0-0 0-0 7. Bg5 Bg4 8. h3 Bh5 9. Nbd2 h6 10. Bh4 c6 11. c3 Nbd7 12. Qc2 Bxf3 13. Nxf3 Re8 14. Rae1 Qc7 15. Bxf6 Nxf6 16. c4 dxc4 17. Bxc4 Rac8 18. Rxe8+ Rxe8 19. Re1 Rxe1+ 1/2-1/2

[Event "ARG-ch U12"]
[Site "Buenos Aires"]
[Date "2019.03.01"]
[Round "2.2"]
[White "Matvyeyev, Alexander"]
[Black "Fiorito, Joaquin"]
[Result "0-1"]
[ECO "D45"]
[WhiteElo "1322"]
[BlackElo "1747"]
[PlyCount "72"]
[EventDate "2019.03.01"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "ARG"]
[SourceTitle "EXT 2024"]
[Source "ChessBase"]
[SourceDate "2023.10.10"]
[SourceVersion "1"]
[SourceVersionDate "2023.10.10"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. e3 c6 6. c5 b6 7. b4 a5 8. bxa5 bxc5 9. dxc5 Bxc5 10. Bd3 Bb4 11. Bd2 0-0 12. 0-0 c5 13. a3 Bxa5 14. Qe2 Ba6 15. Bxa6 Nxa6 16. Ne5 Bc7 17. Ng4 c4 18. Nb5 Nxg4 19. Qxg4 Be5 20. Nd4 Re8 21. Bc3 Bxd4 22. Bxd4 e5 23. Bc3 Nc5 24. f4 d4 25. exd4 exd4 26. Rad1 Nd3 27. Be1 Nxe1 28. Rfxe1 Rxe1+ 29. Rxe1 d3 30. Rd1 Rxa3 31. Qf3 Qd4+ 32. Kf1 Ra1 33. Rxa1 Qxa1+ 34. Kf2 Qd4+ 35. Kg3 g6 36. Qd1 c3 0-1

