[Event "Troisdorf op"]
[Site "Troisdorf"]
[Date "2012.12.04"]
[Round "7"]
[White "Ziabari, Morteza"]
[Black "Doering, Mirko"]
[Result "0-1"]
[ECO "C36"]
[WhiteElo "1907"]
[BlackElo "1804"]
[PlyCount "106"]
[EventDate "2012.10.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e5 2. f4 d5 3. exd5 exf4 4. Nf3 Nf6 5. Bb5+ c6 6. Qe2+ Be7 7. dxc6 bxc6 8. Ba4 0-0 9. d4 Bb4+ 10. c3 Ba6 11. Qc2 Re8+ 12. Ne5 Qxd4 13. Bd2 Qxe5+ 14. Kd1 Bd6 15. Kc1 Qh5 16. c4 Nbd7 17. Bxc6 Rac8 18. Bf3 Qg6 19. Qxg6 hxg6 20. b3 Ne5 21. Be2 Neg4 22. Bf3 Ne3 23. Bc3 Ne4 24. Bxe4 Rxe4 25. Nd2 Ba3+ 26. Bb2 Bxb2+ 27. Kxb2 Ree8 28. Rhg1 Rcd8 29. Nf3 Bb7 30. Rac1 Bxf3 31. gxf3 Rd2+ 32. Ka3 Rxh2 33. c5 Nc2+ 34. Ka4 Nd4 35. a3 Nxf3 36. Rgf1 Nd4 37. Rc4 Ne6 38. b4 g5 39. Ka5 g4 40. c6 Rh5+ 41. Ka6 g3 42. c7 Nxc7+ 43. Rxc7 g2 44. Rg1 f3 45. Rcc1 Re7 46. b5 Rh6+ 47. Ka5 Rg6 48. Rc2 Rf6 49. Rf2 Re2 50. Rxe2 fxe2 51. a4 Rf1 52. Rxg2 e1Q+ 53. Ka6 Rf6+ 0-1

[Event "Troisdorf op"]
[Site "Troisdorf"]
[Date "2012.11.27"]
[Round "6"]
[White "Doering, Mirko"]
[Black "Friedrich, Johannes"]
[Result "1-0"]
[ECO "B83"]
[WhiteElo "1804"]
[BlackElo "1323"]
[PlyCount "61"]
[EventDate "2012.10.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d6 5. Nc3 Nf6 6. Be2 e6 7. Be3 Be7 8. 0-0 0-0 9. f4 e5 10. Nxc6 bxc6 11. Qe1 Bb7 12. Qg3 exf4 13. Bxf4 d5 14. Bh6 Ne8 15. e5 Bh4 16. Qf3 gxh6 17. g3 Bg5 18. Bd3 Qb6+ 19. Kh1 Qe3 20. Qf5 Nf6 21. exf6 Qxd3 22. Qxd3 d4 23. Ne4 c5 24. h4 Rfe8 25. Rae1 Be3 26. Rxe3 dxe3 27. Rf4 Rxe4 28. Rxe4 Re8 29. Kg1 Bxe4 30. Qxe3 Bc6 31. Qxh6 1-0

[Event "Troisdorf op"]
[Site "Troisdorf"]
[Date "2012.11.20"]
[Round "5"]
[White "Sejdini, Valentin"]
[Black "Doering, Mirko"]
[Result "1-0"]
[ECO "A02"]
[WhiteElo "1810"]
[BlackElo "1804"]
[PlyCount "123"]
[EventDate "2012.10.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. f4 Nf6 2. Nf3 e6 3. e3 b6 4. Be2 Bb7 5. d3 c5 6. 0-0 Be7 7. Nc3 d5 8. Qe1 0-0 9. Ne5 Nbd7 10. Nxd7 Qxd7 11. Bf3 b5 12. Ne2 a6 13. Ng3 Rfe8 14. e4 dxe4 15. dxe4 c4 16. Be3 Rad8 17. Qa5 Qc8 18. Kh1 Bc5 19. Bxc5 Qxc5 20. Rad1 Qc8 21. Qb6 Nd7 22. Qe3 Nf6 23. Nh5 Nxh5 24. Bxh5 g6 25. Bf3 f5 26. Rfe1 Rxd1 27. Rxd1 Rd8 28. Re1 Kf7 29. h3 fxe4 30. Bxe4 Bxe4 31. Qxe4 Rd5 32. Qe3 Qd7 33. Kh2 h5 34. Re2 h4 35. Qf2 Qe7 36. Qe1 Qc7 37. Qxh4 Rh5 38. Qg4 Rf5 39. g3 Qc6 40. Re5 Qb6 41. Qe2 a5 42. Kg2 a4 43. a3 Qc6+ 44. Qe4 Qxe4+ 45. Rxe4 Rd5 46. Kf3 Kf6 47. Re2 Rc5 48. c3 Rd5 49. h4 Rd3+ 50. Kg4 Rd8 51. Re5 Rb8 52. Kf3 Rb7 53. h5 gxh5 54. Rxh5 Rb8 55. Ke4 Kg6 56. Re5 Kf6 57. g4 Rb7 58. g5+ Kf7 59. f5 exf5+ 60. Kxf5 Rb6 61. Ke4 Rb8 62. Kd4 1-0

[Event "Troisdorf op"]
[Site "Troisdorf"]
[Date "2012.11.13"]
[Round "4"]
[White "Doering, Mirko"]
[Black "Kuhn, Andreas"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "1804"]
[BlackElo "1944"]
[PlyCount "62"]
[EventDate "2012.10.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Bd3 e5 4. d5 c6 5. c4 Nbd7 6. Be3 Be7 7. Nf3 Ng4 8. Qd2 Nxe3 9. Qxe3 0-0 10. Nc3 Nc5 11. Bc2 f5 12. exf5 Bxf5 13. Bxf5 Rxf5 14. 0-0 Nd7 15. Rae1 c5 16. Ne4 Nf8 17. Ng3 Rf7 18. Ne4 Rb8 19. a4 a6 20. b3 h6 21. Nfd2 b5 22. axb5 axb5 23. f4 exf4 24. Rxf4 Rxf4 25. Qxf4 bxc4 26. Nxc4 Rxb3 27. Nexd6 Bxd6 28. Nxd6 Qf6 29. Qxf6 gxf6 30. Ne4 Nd7 31. Rc1 Rd3 1/2-1/2

[Event "Troisdorf op"]
[Site "Troisdorf"]
[Date "2012.11.06"]
[Round "3"]
[White "Jantz, Heiko"]
[Black "Doering, Mirko"]
[Result "1/2-1/2"]
[ECO "A29"]
[WhiteElo "2043"]
[BlackElo "1804"]
[PlyCount "65"]
[EventDate "2012.10.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 Bb4 5. Nd5 d6 6. Nxb4 Nxb4 7. d4 exd4 8. Nxd4 0-0 9. Bg2 Ng4 10. a3 Na6 11. e4 Ne5 12. Qc2 Nc5 13. 0-0 a5 14. f4 Ned7 15. b3 Ne6 16. Nb5 Nec5 17. Bb2 f6 18. Rad1 Kh8 19. b4 axb4 20. axb4 Na6 21. Ba3 Qe7 22. Qc3 Ndb8 23. c5 dxc5 24. bxc5 c6 25. Nd6 Nc7 26. Rb1 Nb5 27. Nxb5 cxb5 28. Rxb5 Nc6 29. Rbb1 h6 30. Rfe1 Qc7 31. e5 fxe5 32. fxe5 Be6 33. Rbd1 1/2-1/2

[Event "Troisdorf op"]
[Site "Troisdorf"]
[Date "2012.10.28"]
[Round "2"]
[White "Probst, Carsten"]
[Black "Doering, Mirko"]
[Result "0-1"]
[ECO "C55"]
[WhiteElo "1092"]
[BlackElo "1804"]
[PlyCount "80"]
[EventDate "2012.10.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Be7 5. d4 exd4 6. Nxd4 Ne5 7. Bb3 0-0 8. 0-0 d6 9. Bf4 Ng6 10. Bg3 Ng4 11. h3 Nf6 12. f4 h6 13. f5 Ne5 14. Nf3 Nxf3+ 15. Qxf3 c6 16. Rad1 Nh7 17. e5 Ng5 18. Qh5 Qb6+ 19. Bf2 Qc7 20. h4 Nh7 21. Bd4 dxe5 22. Be3 Nf6 23. Qf3 a5 24. Ne4 b5 25. c3 a4 26. Bc2 Nd5 27. Bd2 f6 28. Qg3 Nf4 29. Bxf4 exf4 30. Rxf4 Bb7 31. Qg6 Qxf4 32. Rf1 Qe3+ 33. Kh2 Bc5 34. Ng3 Bd6 35. Rf3 Bxg3+ 36. Rxg3 Qe7 37. Qh5 Kh8 38. Rg6 c5 39. g4 Qe2+ 40. Kg1 Qg2# 0-1

[Event "Troisdorf op"]
[Site "Troisdorf"]
[Date "2012.10.23"]
[Round "1"]
[White "Doering, Mirko"]
[Black "Lorenz, Steffen"]
[Result "0-1"]
[ECO "B07"]
[WhiteElo "1804"]
[BlackElo "1995"]
[PlyCount "52"]
[EventDate "2012.10.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Bd3 e5 4. c3 Nc6 5. Be3 g6 6. Ne2 Bg7 7. 0-0 0-0 8. d5 Ne7 9. Ng3 Ng4 10. Bd2 f5 11. f3 Nf6 12. f4 fxe4 13. fxe5 dxe5 14. Nxe4 Nfxd5 15. Rxf8+ Qxf8 16. Bc4 c6 17. Bg5 Kh8 18. Nbd2 Nf5 19. Qe2 h6 20. g4 hxg5 21. gxf5 Qxf5 22. Rf1 Nf4 23. Qe3 Be6 24. Bxe6 Qxe6 25. Nxg5 Qg4+ 26. Qg3 Ne2+ 0-1

[Event "Leverkusen Bayer op 10th"]
[Site "Leverkusen"]
[Date "2012.03.28"]
[Round "7"]
[White "Doering, Mirko"]
[Black "Teuber, Alfons"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "1581"]
[BlackElo "1061"]
[PlyCount "89"]
[EventDate "2012.01.11"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 4. Qe2 Nd6 5. Nc6+ Qe7 6. Nxe7 Bxe7 7. Qf3 0-0 8. Bd3 Nc6 9. 0-0 Ne5 10. Qh3 Nxd3 11. Qxd3 Bf6 12. Nc3 a6 13. Nd5 Bd8 14. b3 c6 15. Ne3 Bf6 16. Rb1 Nb5 17. Bb2 Bxb2 18. Rxb2 d5 19. c4 Nc7 20. cxd5 cxd5 21. Nxd5 Nxd5 22. Qxd5 Re8 23. Rbb1 Rb8 24. Qd6 Be6 25. Rfe1 Rbd8 26. Qb4 b5 27. d4 Rd5 28. Rbc1 Red8 29. Qa5 R5d6 30. a4 bxa4 31. Qxa4 g6 32. b4 Bd7 33. Qa5 Bb5 34. Qa1 Rxd4 35. Re8+ Rxe8 36. Qxd4 h5 37. g4 hxg4 38. Qxg4 Kg7 39. h4 f6 40. Rc7+ Kh6 41. Qf4+ g5 42. hxg5+ Kh5 43. Rh7+ Kg6 44. Rh6+ Kg7 45. Qxf6+ 1-0

[Event "Leverkusen Bayer op 10th"]
[Site "Leverkusen"]
[Date "2012.03.21"]
[Round "6"]
[White "Elsweiler, Karl Heinz"]
[Black "Doering, Mirko"]
[Result "1-0"]
[ECO "A00"]
[WhiteElo "1555"]
[BlackElo "1581"]
[PlyCount "65"]
[EventDate "2012.01.11"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. b4 d5 2. Bb2 Bf5 3. e3 e6 4. c4 Nf6 5. a3 Be7 6. Nf3 0-0 7. Be2 dxc4 8. Bxc4 Nbd7 9. d4 Nb6 10. Be2 Ng4 11. 0-0 Bf6 12. h3 Nh6 13. Nc3 Nd5 14. Rc1 c6 15. Qb3 a6 16. Rfd1 Qc7 17. Nxd5 exd5 18. Qxd5 Be6 19. Qc5 Bd5 20. Nd2 Rfe8 21. Bf3 Rad8 22. Bxd5 Be7 23. Qc4 Rd6 24. Be4 Qd8 25. Qc2 f5 26. Bf3 Rg6 27. Bh5 Rg5 28. Bxe8 Qxe8 29. Nf3 Rh5 30. Ne5 f4 31. exf4 Qf8 32. Qc4+ Kh8 33. d5 1-0

[Event "Leverkusen Bayer op 10th"]
[Site "Leverkusen"]
[Date "2012.03.07"]
[Round "5"]
[White "Doering, Mirko"]
[Black "Ringeltaube, Denny"]
[Result "1/2-1/2"]
[ECO "B92"]
[WhiteElo "1581"]
[BlackElo "1568"]
[PlyCount "44"]
[EventDate "2012.01.11"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[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 0-0 9. Be3 Be6 10. Bg5 Nbd7 11. f4 exf4 12. Bxf4 Ne5 13. Bxe5 dxe5 14. Kh1 Qxd1 15. Raxd1 Rfd8 16. h3 Bb4 17. Bd3 Bxc3 18. bxc3 Rac8 19. Na5 b5 20. c4 bxc4 21. Nxc4 Bxc4 22. Bxc4 Rf8 1/2-1/2

[Event "Leverkusen Bayer op 10th"]
[Site "Leverkusen"]
[Date "2012.02.22"]
[Round "4"]
[White "Vranidis, Athanassios"]
[Black "Doering, Mirko"]
[Result "1-0"]
[ECO "E91"]
[WhiteElo "1745"]
[BlackElo "1581"]
[PlyCount "93"]
[EventDate "2012.01.11"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 0-0 6. Be2 Re8 7. 0-0 c6 8. h3 Qc7 9. Be3 e5 10. d5 a6 11. Rc1 c5 12. Nd2 Kh8 13. f4 Bh6 14. Qe1 Ng8 15. Qg3 f5 16. fxe5 Bxe3+ 17. Qxe3 Rxe5 18. Nf3 Re8 19. Qf4 Qe7 20. Bd3 Nd7 21. Rce1 Ne5 22. exf5 Bxf5 23. Bxf5 gxf5 24. Nxe5 dxe5 25. Qxf5 Qg7 26. Re2 Nh6 27. Qf6 Qxf6 28. Rxf6 Kg7 29. Re6 Rxe6 30. dxe6 Kf6 31. Ne4+ Kxe6 32. Nxc5+ Kf5 33. Nxb7 e4 34. Nc5 Rc8 35. Nxe4 Kf4 36. b3 Nf5 37. Nc3 Ng3 38. Nd5+ Kg5 39. Re5+ Kh4 40. Re6 h5 41. Rxa6 Rf8 42. Rf6 Ra8 43. a4 Re8 44. Rf4+ Kg5 45. Kf2 Nf5 46. a5 Nd6 47. h4+ 1-0

[Event "Leverkusen Bayer op 10th"]
[Site "Leverkusen"]
[Date "2012.02.08"]
[Round "3"]
[White "Doering, Mirko"]
[Black "Kies, Werner"]
[Result "0-1"]
[ECO "B40"]
[WhiteElo "1581"]
[BlackElo "1897"]
[PlyCount "124"]
[EventDate "2012.01.11"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. e5 Ne4 7. Bd2 Qb6 8. Nxe4 Qxd4 9. Nd6+ Bxd6 10. exd6 Qxd6 11. Qg4 Qe5+ 12. Be2 h5 13. Qc4 Nc6 14. 0-0-0 d5 15. Qd3 Bd7 16. Bf3 0-0-0 17. g3 Qc7 18. Kb1 Ne5 19. Qa3 Nxf3 20. Qxf3 f6 21. Qa3 b6 22. Rhe1 Kb7 23. Qe7 Bc8 24. Qa3 e5 25. h4 Bf5 26. Ka1 Qc5 27. Bb4 Qxf2 28. c4 dxc4 29. Rc1 Be6 30. Rf1 Qe2 31. Bc3 Rd7 32. Qb4 Rhd8 33. a4 Qe4 34. Rfe1 Qc6 35. Ka2 Qd6 36. Rcd1 Qxb4 37. Rxd7+ Rxd7 38. Bxb4 c3+ 39. Kb1 cxb2 40. Kxb2 Rd3 41. Bf8 Rxg3 42. Rd1 Rg4 43. Rd6 Bc8 44. Ka3 f5 45. Rd5 e4 46. Re5 g6 47. Be7 Bd7 48. Bg5 Rg3+ 49. Kb4 a5+ 50. Kc4 Bxa4 51. Re7+ Ka6 52. Bf4 Bb3+ 53. Kd4 Rd3+ 54. Ke5 a4 55. Re8 Kb5 56. Kf6 a3 57. Kxg6 a2 58. Ra8 Ba4 59. Be5 e3 60. Re8 f4 61. Kxh5 e2 62. Bh8 Re3 0-1

[Event "Leverkusen Bayer op 10th"]
[Site "Leverkusen"]
[Date "2012.01.25"]
[Round "2"]
[White "Schimpf, Rolf"]
[Black "Doering, Mirko"]
[Result "0-1"]
[ECO "A22"]
[WhiteElo "1676"]
[BlackElo "1581"]
[PlyCount "74"]
[EventDate "2012.01.11"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 c6 3. e4 e5 4. Nf3 d6 5. g3 g6 6. Bg2 Bg7 7. 0-0 Bg4 8. h3 Bxf3 9. Qxf3 0-0 10. d3 Qc7 11. Be3 Nbd7 12. Rad1 Rad8 13. Qe2 Rfe8 14. f3 Nh5 15. Qf2 a6 16. g4 Nf4 17. Bxf4 exf4 18. d4 Nf8 19. Qd2 g5 20. Kh2 Ng6 21. Rfe1 h6 22. b4 Qc8 23. Qc2 Nh4 24. Rd3 d5 25. cxd5 cxd5 26. e5 f6 27. Qb3 Kh8 28. Nxd5 Rxd5 29. Rc3 Qd8 30. Rec1 Rxd4 31. exf6 Qxf6 32. Rc8 Red8 33. Kg1 Rd2 34. Bf1 Qd4+ 35. Kh1 Qf2 36. Rxd8+ Rxd8 37. Rd1 Bd4 0-1

[Event "Leverkusen Bayer op 10th"]
[Site "Leverkusen"]
[Date "2012.01.11"]
[Round "1"]
[White "Doering, Mirko"]
[Black "Jiritschka, Wolfgang"]
[Result "1/2-1/2"]
[ECO "B07"]
[WhiteElo "1581"]
[BlackElo "1860"]
[PlyCount "60"]
[EventDate "2012.01.11"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 Bg7 5. f3 Nbd7 6. Qd2 a6 7. Bh6 0-0 8. Bxg7 Kxg7 9. g4 e5 10. Nge2 exd4 11. Nxd4 Ne5 12. Be2 c5 13. Nb3 Be6 14. 0-0-0 Bxb3 15. cxb3 Ne8 16. h4 h6 17. f4 Nc6 18. Rdg1 Nd4 19. Kb1 b5 20. Bd1 Nc7 21. h5 Qe7 22. g5 hxg5 23. f5 b4 24. hxg6 fxg6 25. Rxg5 Rh8 26. Rxg6+ Kf7 27. Rg7+ Kxg7 28. Qg2+ Kf6 29. Qg6+ Ke5 30. Qg3+ Kf6 1/2-1/2

