[Event "Cuiaba Contaud op"]
[Site "Cuiaba"]
[Date "2017.07.30"]
[Round "6"]
[White "Arruda Filho, Ivo Pereira de"]
[Black "De Oliveira, Pedro Antonio"]
[Result "0-1"]
[ECO "C45"]
[WhiteElo "1775"]
[BlackElo "1762"]
[PlyCount "74"]
[EventDate "2017.07.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. Nf3 Nc6 2. e4 e5 3. d4 exd4 4. Nxd4 Bc5 5. Nxc6 bxc6 6. Bd3 Nf6 7. Bg5 h6 8. Bh4 d6 9. 0-0 0-0 10. Nd2 Re8 11. Re1 Be6 12. Nb3 Bb6 13. c4 a5 14. a4 Rb8 15. Qc2 Kh8 16. Rad1 g5 17. Bg3 Qe7 18. Qc3 Kg8 19. Nd4 Bxd4 20. Qxd4 Nh5 21. e5 d5 22. Bb1 Ng7 23. c5 Rb4 24. Qe3 Rc4 25. Qd2 Qxc5 26. Rc1 Qb4 27. Qe2 Bf5 28. Bxf5 Rxc1 29. Rxc1 Nxf5 30. Qc2 Nd4 31. Qd3 Qxb2 32. Re1 Qb4 33. Rf1 Qxa4 34. f4 Ne6 35. f5 Qd4+ 36. Qxd4 Nxd4 37. f6 Ne2+ 0-1

[Event "Cuiaba Contaud op"]
[Site "Cuiaba"]
[Date "2017.07.30"]
[Round "5"]
[White "De Oliveira, Pedro Antonio"]
[Black "Passos, Rafael Moreira"]
[Result "1/2-1/2"]
[ECO "B48"]
[WhiteElo "1762"]
[BlackElo "1485"]
[PlyCount "39"]
[EventDate "2017.07.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Be3 a6 6. Nc3 Qc7 7. Qd2 Nf6 8. f3 Bb4 9. a3 Be7 10. 0-0-0 b5 11. g4 d6 12. h4 Bb7 13. Kb1 b4 14. axb4 Nxb4 15. h5 Nc6 16. g5 Nd7 17. Bh3 Nxd4 18. Bxd4 Ne5 19. Bxe5 dxe5 20. g6 1/2-1/2

[Event "Cuiaba Contaud op"]
[Site "Cuiaba"]
[Date "2017.07.29"]
[Round "3"]
[White "De Oliveira, Pedro Antonio"]
[Black "Carmo, Jose Arlindo"]
[Result "1-0"]
[ECO "B92"]
[WhiteElo "1762"]
[BlackElo "1691"]
[PlyCount "83"]
[EventDate "2017.07.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be6 8. Be2 Be7 9. a4 Bxb3 10. cxb3 Qa5 11. 0-0 Nbd7 12. Rc1 0-0 13. Qd2 Qd8 14. Rfd1 Rc8 15. h3 Rc6 16. b4 Qb8 17. b5 axb5 18. Bxb5 Rc7 19. Nd5 Nxd5 20. Qxd5 Nf6 21. Qd3 Rfc8 22. Rxc7 Qxc7 23. f3 Qa5 24. Bd2 Qb6+ 25. Be3 Qc7 26. Bg5 Rd8 27. Rc1 Qb8 28. Qc4 h6 29. Be3 Kf8 30. Bb6 d5 31. exd5 Rxd5 32. Qc8+ Qxc8 33. Rxc8+ Bd8 34. Rxd8+ Rxd8 35. Bxd8 Ne8 36. Bxe8 Kxe8 37. Bc7 f6 38. Bd6 g6 39. Kf2 Kd7 40. Bf8 h5 41. b4 Kc6 42. Bg7 1-0

[Event "Cuiaba Contaud op"]
[Site "Cuiaba"]
[Date "2017.07.29"]
[Round "4"]
[White "Guimaraes, Wagner Peixoto"]
[Black "De Oliveira, Pedro Antonio"]
[Result "1-0"]
[ECO "C68"]
[WhiteElo "2196"]
[BlackElo "1762"]
[PlyCount "24"]
[EventDate "2017.07.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. 0-0 Bd6 6. d4 Qe7 7. dxe5 Bxe5 8. Nxe5 Qxe5 9. Nc3 Bd7 10. Qf3 Nf6 11. Bf4 Qa5 12. b4 Qh5 1-0

[Event "Cuiaba Contaud op"]
[Site "Cuiaba"]
[Date "2017.07.28"]
[Round "2"]
[White "Leite, Coraci de Jesus"]
[Black "De Oliveira, Pedro Antonio"]
[Result "1-0"]
[ECO "B40"]
[WhiteElo "1787"]
[BlackElo "1762"]
[PlyCount "95"]
[EventDate "2017.07.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BRA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Bd3 Bc5 6. Nb3 Bb4+ 7. c3 Be7 8. f4 d6 9. Qf3 Nbd7 10. Be3 a5 11. 0-0 e5 12. c4 a4 13. N3d2 Qc7 14. Nc3 exf4 15. Qxf4 g5 16. Qf2 Ra5 17. b4 axb3 18. Nxb3 Ne5 19. Nxa5 Qxa5 20. Qd2 Nfg4 21. Bd4 f6 22. Be2 h5 23. h3 Nh6 24. Bxh5+ Nhf7 25. Bxf7+ Kxf7 26. Bxe5 Qxe5 27. Qd5+ Kg6 28. Qxe5 dxe5 29. Nd5 Bc5+ 30. Kh2 Rf8 31. g4 Kg7 32. a4 Bd4 33. Ra3 b6 34. Rff3 Ba6 35. Nxf6 Kg6 36. Nd5 Rxf3 37. Rxf3 Bxc4 38. Rf6+ Kg7 39. Rf5 Kg6 40. Ne7+ Kh6 41. Nc6 Be3 42. Nxe5 Bb3 43. Nd7 Bxa4 44. Nxb6 Bc2 45. Rf6+ Kg7 46. Nd5 Bf4+ 47. Rxf4 gxf4 48. Nxf4 1-0

[Event "Fortaleza Borges Memorial"]
[Site "Fortaleza"]
[Date "2012.06.28"]
[Round "6"]
[White "De Oliveira, Pedro Antonio"]
[Black "Nunes, Moezio Correia"]
[Result "0-1"]
[ECO "B08"]
[BlackElo "1937"]
[PlyCount "65"]
[EventDate "2012.06.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. e4 d6 2. Nf3 Nf6 3. Nc3 g6 4. Bc4 Bg7 5. d4 0-0 6. 0-0 Nbd7 7. Re1 c5 8. e5 Ng4 9. e6 Nb6 10. exf7+ Kh8 11. Qd3 d5 12. Bb5 a6 13. dxc5 axb5 14. cxb6 Qxb6 15. Nxd5 Qxf2+ 16. Kh1 Bf5 17. Qxb5 Qxc2 18. Be3 Be4 19. Re2 Qd3 20. Qxd3 Bxd3 21. Rd2 Bc4 22. Bd4 e5 23. Bc3 Rad8 24. Rad1 Bh6 25. Nxe5 Nxe5 26. Bxe5+ Bg7 27. Bxg7+ Kxg7 28. Nf4 Rxd2 29. Rxd2 Rxf7 30. Rd4 Bxa2 31. Kg1 b5 32. Kf2 g5 33. Ke3 0-1

[Event "Fortaleza Borges Memorial"]
[Site "Fortaleza"]
[Date "2012.06.26"]
[Round "5"]
[White "Nogueira, Jorge da Silva"]
[Black "De Oliveira, Pedro Antonio"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "1568"]
[PlyCount "81"]
[EventDate "2012.06.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Bf5 3. e3 e6 4. Bd3 Bg6 5. 0-0 Nf6 6. Qe2 Nbd7 7. Nbd2 c5 8. c3 c4 9. Bb1 Qc7 10. e4 dxe4 11. Nxe4 Nxe4 12. Bxe4 Bxe4 13. Qxe4 Nf6 14. Qe2 Bd6 15. h3 0-0 16. Re1 Nd5 17. Ne5 Bxe5 18. dxe5 Rfd8 19. Bg5 Rd7 20. Qg4 Qb6 21. Re2 g6 22. Bf6 Nxf6 23. exf6 Qd8 24. Qg5 Rd5 25. Qf4 Rc8 26. Rae1 Rf5 27. Qe4 Rc6 28. Qe3 b6 29. Rd2 Qxf6 30. Red1 Rc8 31. Qe4 Qe7 32. Rd7 Qc5 33. Qh4 g5 34. Qh6 Qxf2+ 35. Kh1 Rf8 36. Rd8 Qc5 37. g4 Rf1+ 38. Rxf1 Rxd8 39. Qf6 Qd5+ 40. Kg1 Qb7 41. Qxd8+ 1-0

[Event "Fortaleza Borges Memorial"]
[Site "Fortaleza"]
[Date "2012.06.23"]
[Round "4"]
[White "De Oliveira, Pedro Antonio"]
[Black "Lima, Antonio Stenio Patr"]
[Result "0-1"]
[ECO "B54"]
[BlackElo "1798"]
[PlyCount "116"]
[EventDate "2012.06.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bc4 e6 4. Nc3 Nc6 5. d4 cxd4 6. Nxd4 a6 7. a3 g6 8. 0-0 Bg7 9. Nxc6 bxc6 10. Ne2 d5 11. exd5 cxd5 12. Bb3 Bd7 13. Rb1 Nf6 14. Bg5 Qc7 15. Bxf6 Bxf6 16. Re1 0-0 17. c3 Rab8 18. Bc2 Be5 19. Ng3 Qd6 20. Qe2 Bg7 21. Red1 Bb5 22. Qf3 Qb6 23. Re1 a5 24. h4 a4 25. h5 Qa6 26. Re3 Bc4 27. Qg4 f5 28. Qh3 Rf6 29. Rf3 g5 30. Bxf5 exf5 31. Nxf5 Qe6 32. Qg3 Rbf8 33. Nxg7 Kxg7 34. Qxg5+ Kh8 35. h6 Qf7 36. Qe5 Qg6 37. Re1 Qxh6 38. Qd4 Qg7 39. Rg3 Rg6 40. Rxg6 Qxd4 41. cxd4 hxg6 42. Re7 Rf4 43. Ra7 Bb3 44. Kf1 Rxd4 45. Ke2 Rd1 46. Rb7 Rb1 47. g4 Rxb2+ 48. Ke3 Rc2 49. Kf4 Rxf2+ 50. Kg5 Bc2 51. Kh6 Kg8 52. Rb4 Kf7 53. Rb7+ Ke6 54. Rb6+ Ke5 55. Kg5 Rf3 56. Rb2 Bb3 57. Kxg6 d4 58. g5 d3 0-1

[Event "Fortaleza Borges Memorial"]
[Site "Fortaleza"]
[Date "2012.06.21"]
[Round "3"]
[White "De Brito Buarque, Hugo Leonardo"]
[Black "De Oliveira, Pedro Antonio"]
[Result "1-0"]
[ECO "A85"]
[WhiteElo "1930"]
[PlyCount "77"]
[EventDate "2012.06.14"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BRA"]
[SourceTitle "CBM 149 Extra"]
[Source "ChessBase"]
[SourceDate "2012.08.24"]
[SourceVersion "1"]
[SourceVersionDate "2012.08.24"]
[SourceQuality "1"]

1. d4 f5 2. Nf3 Nf6 3. c4 g6 4. Nc3 Bg7 5. e3 d6 6. Be2 0-0 7. 0-0 Qe8 8. b4 Bd7 9. Qb3 c6 10. Bb2 h6 11. Rac1 g5 12. d5 Na6 13. Nd4 Nc7 14. Bd3 Ng4 15. Qc2 Qf7 16. dxc6 bxc6 17. Be2 e5 18. Nb3 Nf6 19. Rcd1 Qe6 20. b5 Rad8 21. Ba3 c5 22. Na5 Rb8 23. Qd2 Nfe8 24. Bxc5 dxc5 25. Qxd7 Qb6 26. Nc6 Rb7 27. Na4 Nxb5 28. Qd5+ Kh8 29. Nxb6 Nc3 30. Qd2 Nxd1 31. Rxd1 axb6 32. Nd8 Rb8 33. Bh5 Nf6 34. Bg6 Ne4 35. Qd7 Nc3 36. Nf7+ Kg8 37. Qe6 Nxd1 38. Nxh6+ Kh8 39. Qg8+ 1-0

[Event "TBI-C-XIII-XIV-P-0023 corr"]
[Site "Brazil CXEB"]
[Date "1995.09.15"]
[Round "?"]
[White "De Moura, Adelfio Mendonca"]
[Black "De Oliveira, Pedro Antonio"]
[Result "0-1"]
[ECO "B51"]
[PlyCount "28"]
[EventDate "1995.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[EventCountry "BRA"]
[SourceTitle "Corr 2004"]
[Source "ChessBase"]
[SourceDate "2003.04.28"]
[SourceVersion "3"]
[SourceVersionDate "2003.04.28"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 d6 3. Bb5+ Nc6 4. Nf3 e5 5. d3 Be7 6. 0-0 Nf6 7. Bc4 0-0 8. b3 Bg4 9. a4 Nd4 10. Be3 Nxf3+ 11. gxf3 Bh5 12. Bg5 Qd7 13. Ne2 Bxf3 14. Qc1 Qh3 0-1

[Event "TBI-C-XIII-XIV-P-0023 corr"]
[Site "Brazil CXEB"]
[Date "1995.09.15"]
[Round "?"]
[White "De Oliveira, Pedro Antonio"]
[Black "Da Silva, Joao Alberto Correi"]
[Result "1/2-1/2"]
[ECO "D86"]
[PlyCount "49"]
[EventDate "1995.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[EventCountry "BRA"]
[SourceTitle "Corr 2004"]
[Source "ChessBase"]
[SourceDate "2003.04.28"]
[SourceVersion "3"]
[SourceVersionDate "2003.04.28"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 cxd4 9. cxd4 Nc6 10. Bb2 Qa5+ 11. Bc3 Qc7 12. Rc1 0-0 13. 0-0 Bd7 14. Bb3 Qb6 15. d5 Ne5 16. Bd4 Qa6 17. Rc7 Bb5 18. Re1 Rac8 19. Rxc8 Rxc8 20. Qa1 Bxe2 21. Bxe5 Bxe5 22. Qxe5 Qa5 23. Ra1 Qd2 24. h3 a6 25. Qxe7 1/2-1/2

[Event "TBI-C-XIII-XIV-P-0023 corr"]
[Site "Brazil CXEB"]
[Date "1995.09.15"]
[Round "?"]
[White "De Oliveira, Pedro Antonio"]
[Black "Dos Reis, Gregorio A"]
[Result "1-0"]
[ECO "D85"]
[PlyCount "89"]
[EventDate "1995.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[EventCountry "BRA"]
[SourceTitle "Corr 2004"]
[Source "ChessBase"]
[SourceDate "2003.04.28"]
[SourceVersion "3"]
[SourceVersionDate "2003.04.28"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 c5 7. Nf3 Bg7 8. Be3 Nc6 9. h3 0-0 10. Bc4 Qa5 11. Rc1 cxd4 12. Nxd4 Nxd4 13. Bxd4 Bxd4 14. Qxd4 Qg5 15. Ke2 e5 16. Qe3 Qxe3+ 17. Kxe3 Kh8 18. Rb1 f5 19. Rb5 Re8 20. Bd5 f4+ 21. Kd2 Rd8 22. Kc2 Rb8 23. Bc4 Re8 24. Ra5 a6 25. Rc5 b5 26. Bd5 Bd7 27. Rc7 Red8 28. h4 Rbc8 29. Rxc8 Bxc8 30. Ra1 Kg7 31. a4 Kf6 32. axb5 axb5 33. Ra5 Bd7 34. Ra6+ Ke7 35. Rb6 Rf8 36. Kb3 f3 37. g3 Re8 38. Kc2 Rf8 39. Bc6 Bxc6 40. Rxc6 Rd8 41. Rc5 Kf6 42. Rxb5 h5 43. Rd5 Ra8 44. Kd2 Ra2+ 45. Ke3 1-0

[Event "TBI-C-XIII-XIV-P-0023 corr"]
[Site "Brazil CXEB"]
[Date "1995.09.15"]
[Round "?"]
[White "De Oliveira, Pedro Antonio"]
[Black "Pereira, Jose CG"]
[Result "1/2-1/2"]
[ECO "A52"]
[PlyCount "62"]
[EventDate "1995.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[EventCountry "BRA"]
[SourceTitle "Corr 2004"]
[Source "ChessBase"]
[SourceDate "2003.04.28"]
[SourceVersion "3"]
[SourceVersionDate "2003.04.28"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. a3 Nxe5 5. e3 d6 6. Nf3 Nxf3+ 7. Qxf3 Nc6 8. Qe4+ Be7 9. Be2 0-0 10. 0-0 Re8 11. Qc2 g6 12. Bd2 Bf5 13. Bd3 Bxd3 14. Qxd3 Bf8 15. Bc3 Qh4 16. b3 Rad8 17. Rd1 Rd7 18. Nd2 Bg7 19. Bxg7 Kxg7 20. Qc3+ f6 21. Nf1 Ne5 22. Ng3 Ng4 23. h3 Ne5 24. Rd4 Qh6 25. Rad1 Rde7 26. Rf4 b6 27. Rdd4 Qg5 28. Ne4 Nf3+ 29. Kh1 Qxf4 30. exf4 Nxd4 31. Nxd6 Rd8 1/2-1/2

[Event "TBI-C-XIII-XIV-P-0023 corr"]
[Site "Brazil CXEB"]
[Date "1995.09.15"]
[Round "?"]
[White "De Oliveira, Pedro Antonio"]
[Black "Ramos, Angelo Bil"]
[Result "1/2-1/2"]
[ECO "D87"]
[PlyCount "59"]
[EventDate "1995.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[EventCountry "BRA"]
[SourceTitle "Corr 2004"]
[Source "ChessBase"]
[SourceDate "2003.04.28"]
[SourceVersion "3"]
[SourceVersionDate "2003.04.28"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 Nc6 9. Be3 0-0 10. 0-0 Bg4 11. f3 Na5 12. Bxf7+ Rxf7 13. fxg4 Rxf1+ 14. Kxf1 Qd6 15. Kg1 Qe6 16. Qd3 Qc4 17. Qxc4+ Nxc4 18. Bf2 cxd4 19. cxd4 e5 20. d5 Bh6 21. h4 Bd2 22. Rd1 b5 23. Nc1 Bxc1 24. Rxc1 Nd6 25. Bg3 Nxe4 26. Bxe5 Rd8 27. Rd1 a6 28. Re1 Nd2 29. Bc3 Rxd5 30. Re6 1/2-1/2

[Event "TBI-C-XIII-XIV-P-0023 corr"]
[Site "Brazil CXEB"]
[Date "1995.09.15"]
[Round "?"]
[White "Ferreira, Alexander da Silva"]
[Black "De Oliveira, Pedro Antonio"]
[Result "1/2-1/2"]
[ECO "B56"]
[PlyCount "82"]
[EventDate "1995.??.??"]
[EventType "tourn (corr)"]
[EventRounds "9"]
[EventCountry "BRA"]
[SourceTitle "Corr 2004"]
[Source "ChessBase"]
[SourceDate "2003.04.28"]
[SourceVersion "3"]
[SourceVersionDate "2003.04.28"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 d6 6. Bb5 Bd7 7. 0-0 Nf6 8. Nxc6 Bxc6 9. Bg5 Bxb5 10. Nxb5 Qd7 11. Bxf6 Qxb5 12. Bc3 a6 13. a4 Qc5 14. Bd4 Qc4 15. b3 Qc6 16. Qd3 f6 17. c4 Be7 18. Qg3 g6 19. a5 e5 20. Bb6 Qxe4 21. Qh3 f5 22. Qc3 0-0 23. Rfe1 Qc6 24. c5 Bf6 25. b4 d5 26. Qb3 e4 27. Rad1 Rae8 28. Rxd5 Kg7 29. Red1 Re7 30. Bd8 Ref7 31. Rd6 Qc8 32. Bxf6+ Rxf6 33. Rxf6 Rxf6 34. Qd5 Qc7 35. Qd7+ Qxd7 36. Rxd7+ Rf7 37. Rxf7+ Kxf7 38. b5 axb5 39. c6 bxc6 40. a6 Ke6 41. a7 Kd5 1/2-1/2

