No memberships required, just tons of pure chess data for determining your best chess moves! Submit your unique chess games and get listed on our site for free.

Over 3 million unique PGN chess games with comprehensive chess openings explorer and ECO database.

» Chess ECO Database » Chess Openings Explorer » Chess DVD Database Info » ECO Calculator PHP Script
» ECO Calculator Submit Chess Games » Newest Chess Games » Chess Openings
Top Chess Grandmasters, click to view a list of thier Chess Games and remember to download all our Free PGN Downloads
» shirov alexei d » veingold aleksan
» gelfand b » itkis boris » novak ivan » todorcevic miodr » huss andreas » leko peter » anderssen adolf » blagojevic dragi » suba mihail
» vajda levente » cramling pia » blagojevic dragi » weyerstrass » grobe e » czebe attila » markowski tomasz » ivanchuk vassily » borrmann fritz
» mirzoev azer » cherniaev alexan » bulcourf carlos » ivanov alexander » blargh » speelman jonatha » ivanov mikhail m » stummer kurt » hoi carsten
» luther thomas » stevic hrvoje » sunye neto jaime » cifuentes parada » gelfand boris » ulaneo » garcia raimundo » panchenko alexan » scrappy
» flear glenn c » matulovic milan » rybka 101 beta 1 » meszaros gyula » hodgson julian m » grott peter » naumkin igor » smejkal jan » arkell keith c
» lukov valentin » manca federico » ortega lexy

« prev 1 2 3 4 5 6 7 8910 next »

182 Winning Chess Games of MARJANOVIC SLAVO playing as WHITE

Switch to Chess Games of MARJANOVIC SLAVO playing as BLACK

ECO B07 in 1979 play it! marjanovic slavo defeats black's marangunic srdja in 67 moves	1. e4 d6 2. d4 Nf6 3. f3 Nbd7 4. c4 e5 5. Ne2 c6 6. Nbc3 Be7 7. Be3 O-O 8. d5 a5 9. g4 cxd5 10. cxd5 Nc5 11. Ng3 Ne8 12. Qd2 Bh4 13. O-O-O a4 14. Kb1 Bd7 15. Rg1 h6 16. Nf5 Bg5 17. Bb5 Bxf5 18. gxf5 Bxe3 19. Qxe3 Kh7 20. Bxe8 Rxe8 21. Rg4 Rg8 22. Rdg1 a3 23. b3 Nd7 24. Nb5 Nf6 25. Rh4 Rh8 26. Qg5 Rg8 27. Rg3 Kh8 28. Nxd6 Qf8 29. Rxh6+ gxh6 30. Qxf6+ Kh7 31. Nxf7 Rc8 32. Rxg8 Kxg8 33. Nxh6+ Kh7 34. Qg6+
ECO B07 in 2003 play it! marjanovic slavo defeats black's damljanovic bran in 87 moves	1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. Bc4 Be7 6. O-O O-O 7. Re1 c6 8. a4 b6 9. Bg5 a6 10. d5 c5 11. Bf1 h6 12. Bc1 Nh7 13. Rb1 Qc7 14. h3 Ndf6 15. Nh4 Re8 16. Nf5 Bf8 17. Qf3 Kh8 18. g4 Ng8 19. Qg3 g6 20. Ne3 Bg7 21. Nc4 Bd7 22. b4 cxb4 23. Rxb4 Reb8 24. Rb3 Ngf6 25. f4 b5 26. axb5 axb5 27. fxe5 bxc4 28. Rxb8+ Qxb8 29. exf6 Bxf6 30. Bf4 Bd4+ 31. Kh1 Qb2 32. Nd1 Qxc2 33. Bxd6 Ng5 34. Be5+ Bxe5 35. Qxe5+ Kg8 36. Qc3 Ra2 37. Qxc2 Rxc2 38. Ne3 Rc3 39. Bg2 f6 40. d6 Kf7 41. h4 Nh7 42. e5 fxe5 43. Bd5+ Kg7 44. Nxc4
ECO B01 in 1983 play it! marjanovic slavo defeats black's rogers ian aus in 83 moves	1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bg4 6. h3 Bh5 7. g4 Bg6 8. Ne5 e6 9. Nc4 Qa6 10. a3 Qc6 11. Rg1 Nbd7 12. Ne5 Qb6 13. Nc4 Qc6 14. Qe2 O-O-O 15. Bg5 Kb8 16. O-O-O Rc8 17. Bg2 Qa6 18. Rge1 Nb6 19. Ne5 Qa5 20. Bd2 Bxa3 21. Qf3 c6 22. Bf4 Ka8 23. bxa3 Qxa3+ 24. Kd2 Qb4 25. Ra1 Qxd4+ 26. Ke2 Nbd5 27. Nxd5 Nxd5 28. Nxg6 hxg6 29. Bd2 Rcd8 30. Red1 Qc4+ 31. Ke1 Qxc2 32. Qa3 a6 33. Rdc1 Nb4 34. Qxb4 Qd3 35. Rxc6 Rd5 36. Bxd5 exd5 37. Rc7 Rb8 38. Ra3 Re8+ 39. Re7 Rxe7+ 40. Qxe7 Qb1+ 41. Ke2 Qb5+ 42. Kf3
ECO B06 in 1999 play it! marjanovic slavo defeats black's svetushkin dmitr in 111 moves	1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. Bc4 Nf6 5. Qe2 c6 6. e5 dxe5 7. dxe5 Nd5 8. h3 Nd7 9. O-O Qc7 10. Re1 Nc5 11. Bxd5 cxd5 12. Nc3 Be6 13. Qb5+ Qc6 14. Nd4 Qxb5 15. Ndxb5 Kd7 16. Be3 Rhc8 17. Rad1 a6 18. Bxc5 Rxc5 19. Nd4 Rc7 20. f4 Bh6 21. g3 Rd8 22. Rd2 Rc4 23. Kg2 Kc8 24. Nxe6 fxe6 25. h4 Bg7 26. Ne2 h6 27. Nd4 Kd7 28. h5 g5 29. f5 exf5 30. Nxf5 e6 31. Nxg7 Rg8 32. b3 Rc6 33. Nxe6 Kxe6 34. Rf2 Rgc8 35. Ree2 g4 36. Kf1 Ke7 37. Rf4 Rg8 38. c4 dxc4 39. bxc4 Rg5 40. Ree4 Rxh5 41. Rxg4 b5 42. cxb5 Rc2 43. Rh4 Rf5+ 44. Ref4 Rxe5 45. bxa6 Rd5 46. Rf2 Rc1+ 47. Kg2 Rc6 48. Re4+ Re6 49. Rfe2 Rxe4 50. Rxe4+ Kf6 51. Ra4 Rd8 52. a7 Ra8 53. Kh3 Kg5 54. Ra5+ Kg6 55. Kh4 Kf6 56. Kh5
ECO B06 in 1987 play it! marjanovic slavo defeats black's terzic safet bih in 32 moves	1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3 Nf6 5. f4 O-O 6. Nf3 c5 7. d5 e6 8. dxe6 Bxe6 9. Bd3 Nc6 10. f5 Bd7 11. O-O Ng4 12. Nd5 Nd4 13. h3 Ne5 14. Nxe5 Bxe5 15. Bf4 Qh4 16. Qd2 Bc6
ECO B06 in 1999 play it! marjanovic slavo defeats black's popchev milko in 81 moves	1. e4 g6 2. d4 Bg7 3. Nf3 c6 4. h3 d6 5. a4 Nf6 6. Nc3 O-O 7. Be3 a5 8. Nd2 d5 9. e5 Ne8 10. f4 Na6 11. Nf3 Nec7 12. g4 f5 13. Rg1 Rb8 14. Qd2 Nb4 15. Ne2 b5 16. c3 Nba6 17. axb5 Nxb5 18. Nc1 Qb6 19. Nd3 Nbc7 20. Qf2 Ne6 21. Be2 Nac7 22. gxf5 Rxf5 23. Nh4 Nf8 24. Bg4 Rf7 25. Bxc8 Rxc8 26. f5 Nce6 27. Rg3 gxf5 28. O-O-O f4 29. Bxf4 a4 30. Rdg1 a3 31. b4 Ra8 32. Kb1 Qb5 33. Qd2 Qc4 34. Bh6 a2+ 35. Ka1 Ra3 36. Bxg7 Nxg7 37. Nf5 Ne6 38. Nb2 Qb3 39. Nh6+ Kf8 40. Nxf7 Kxf7 41. Qf2+
ECO B06 in 1989 play it! marjanovic slavo defeats black's todorcevic miodr in 77 moves	1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 c6 5. Nf3 Bg4 6. Be3 Qb6 7. Qd3 Nf6 8. O-O-O d5 9. e5 Ne4 10. Ne2 Na6 11. Qa3 Bf8 12. h3 Bd7 13. g4 e6 14. Qb3 h5 15. Rg1 hxg4 16. hxg4 c5 17. Qxb6 axb6 18. a3 b5 19. dxc5 b4 20. axb4 Nxb4 21. Kb1 Ra1+ 22. Kxa1 Nxc2+ 23. Ka2 Nxe3 24. Rc1 Bxc5 25. Ned4 Ke7 26. Bd3 b6 27. Rce1 Bxd4 28. Nxd4 Ra8+ 29. Kb1 Nd2+ 30. Kc1 Ndc4 31. b3 Ra1+ 32. Bb1 Na3 33. Kb2 Rxb1+ 34. Rxb1 Nxb1 35. Kxb1 f5 36. g5 Be8 37. Kc1 Ng4 38. Rg2 b5 39. Kd2
ECO B06 in 1989 play it! marjanovic slavo defeats black's cekro ekrem bih in 119 moves	1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Nf6 5. Nf3 c5 6. dxc5 Qa5 7. Bd3 Qxc5 8. Qe2 O-O 9. Be3 Qa5 10. O-O Bg4 11. h3 Bxf3 12. Qxf3 Nbd7 13. a3 Qc7 14. Kh1 a6 15. Rae1 e6 16. Qf2 Rac8 17. Rd1 Nc5 18. f5 Nfd7 19. Bd4 Bxd4 20. Qxd4 Ne5 21. Be2 Rfd8 22. Rd2 b5 23. Qe3 Qe7 24. Qh6 Rd7 25. Rf4 Qf8 26. Qg5 f6 27. Qg3 Re8 28. b4 Nb7 29. fxe6 Rxe6 30. a4 bxa4 31. Nxa4 a5 32. Nb6 Rf7 33. c3 Qd8 34. Qe3 Kg7 35. Ra2 axb4 36. cxb4 d5 37. Nxd5 Nd6 38. Ra7 Qb8 39. Rxf7+ Nexf7 40. Qd4 Ne8 41. Bg4 Rd6 42. Rf1 h5 43. Bd1 Qb5 44. Kg1 Ne5 45. Qa7+ Rd7 46. Qf2 Rf7 47. Be2 Qb8 48. Qc5 Nd7 49. Qd4 Nd6 50. Nxf6 Nxf6 51. e5 Nf5 52. exf6+ Rxf6 53. Qf4 Qb6+ 54. Kh2 Rf7 55. Bc4 Rf8 56. Bd3 Qd8 57. Qe5+ Qf6 58. Qxf6+ Rxf6 59. b5 Rf8 60. b6
ECO B06 in 2001 play it! marjanovic slavo defeats black's istratescu andre in 109 moves	1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. Bc4 c6 5. Qe2 d5 6. Bb3 dxe4 7. Ng5 Nh6 8. c3 O-O 9. Nxe4 b6 10. Bg5 Qc7 11. Nbd2 Nf5 12. g4 Nd6 13. h4 Nxe4 14. Nxe4 h6 15. h5 hxg5 16. Nxg5 Qf4 17. Nxf7 e6 18. hxg6 Na6 19. Rh3 Nc7 20. Rf3 Qh2 21. O-O-O Nd5 22. Kb1 Bd7 23. Qd3 Be8 24. Qe4 Bxf7 25. gxf7+ Rxf7 26. Qxe6 Qc7 27. Rxf7 Qxf7 28. Qxc6 Rd8 29. f4 Kf8 30. Re1 Qd7 31. Qg6 a5 32. Re6 b5 33. a3 b4 34. Qf5+ Qf7 35. Qxf7+ Kxf7 36. Ra6 Ke8 37. Bxd5 Rxd5 38. Kc2 Bf8 39. a4 Be7 40. Kd3 bxc3 41. bxc3 Bd8 42. g5 Rd7 43. Rc6 Rb7 44. Rh6 Rb1 45. Rh8+ Kd7 46. g6 Rg1 47. f5 Rg4 48. Rf8 Be7 49. Rf7 Ke8 50. c4 Bh4 51. c5 Bf2 52. c6 Rxd4+ 53. Ke2 Bh4 54. Rb7 Bf6 55. Rb8+
ECO B06 in 1983 play it! marjanovic slavo defeats black's rukavina josip c in 86 moves	1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Nf6 5. Nf3 O-O 6. Bd3 Na6 7. O-O c5 8. d5 Rb8 9. Kh1 Nc7 10. a4 a6 11. a5 b5 12. axb6 Rxb6 13. Qe1 Rb4 14. Nd1 e6 15. dxe6 Bxe6 16. Bd2 Rb8 17. c4 Bg4 18. Qg3 Bxf3 19. Qxf3 Ne6 20. Rxa6 Nd4 21. Qf2 Ra8 22. Rxa8 Qxa8 23. Nc3 Qb7 24. Rb1 Qb3 25. h3 Nd7 26. Qg1 Nb6 27. Qd1 Nxc4 28. Qxb3 Nxb3 29. Be1 Nb6 30. Nb5 Rd8 31. Bg3 Na4 32. Bh4 Rd7 33. Bc2 c4 34. Na3 d5 35. exd5 Nxb2 36. Nxc4 Nxc4 37. Rxb3 h6 38. f5 g5 39. Rb8+ Bf8 40. Be1 Rxd5 41. Bb4 Nd6 42. f6 Rd4 43. Kg1 Ne8
ECO B06 in 1988 play it! marjanovic slavo defeats black's todorcevic miodr in 53 moves	1. e4 g6 2. d4 Bg7 3. Nf3 c6 4. h3 d6 5. a4 Nf6 6. Nc3 O-O 7. a5 Nbd7 8. Bc4 e6 9. O-O d5 10. Bd3 dxe4 11. Nxe4 Nxe4 12. Bxe4 Qc7 13. Re1 a6 14. c3 c5 15. d5 exd5 16. Bxd5 Nf6 17. Bc4 Bf5 18. Qa4 Be4 19. Ng5 Bc6 20. Bf4 Qd7 21. Qa2 Bd5 22. Rad1 Rad8 23. Bxd5 Nxd5 24. Ne4 Rfe8 25. Bg5 f6 26. Bxf6 Rxe4 27. Bxd8
ECO B06 in 1987 play it! marjanovic slavo defeats black's terzic safet bih in 63 moves	1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3 Nf6 5. f4 O-O 6. Nf3 c5 7. d5 e6 8. dxe6 Bxe6 9. Bd3 Nc6 10. f5 Bd7 11. O-O Ng4 12. Nd5 Nb4 13. h3 Ne5 14. Nxe5 Bxe5 15. Bf4 Qh4 16. Qd2 Nxd5 17. exd5 Rae8 18. Rf3 Bxf4 19. Rxf4 Qh6 20. Raf1 f6 21. h4 Kh8 22. fxg6 hxg6 23. Qc3 Re5 24. Rxf6 Qe3+ 25. Kh2 Rxf6 26. Rxf6 Kg7 27. Rxd6 Qf4+ 28. Kg1 Bc8 29. Rxg6+ Kf7 30. Rg5 Qe3+ 31. Kh1 Rxg5 32. Bg6+
ECO B06 in 1978 play it! marjanovic slavo defeats black's forintos gyozo v in 75 moves	1. e4 g6 2. d4 Bg7 3. f4 c5 4. d5 d6 5. c4 Nf6 6. Nc3 O-O 7. Nf3 e6 8. dxe6 fxe6 9. Bd3 Nh5 10. g3 Nc6 11. O-O Qe7 12. Bd2 Bd7 13. a3 b6 14. Rb1 Nd4 15. Ng5 Bc6 16. Qg4 Nb3 17. Be3 Rae8 18. e5 Rf5 19. Bxf5 exf5 20. Qd1 Nd4 21. Bxd4 cxd4 22. Nd5 Bxd5 23. cxd5 h6 24. Nf3 dxe5 25. fxe5 Bxe5 26. Re1 Qd6 27. Qa4 Nf6 28. Qc6 Qxc6 29. dxc6 Ne4 30. Nxe5 Rxe5 31. Rbd1 Kf7 32. c7 Re8 33. Rxd4 Rc8 34. Rd7+ Kf6 35. Rc1 Nc5 36. Rh7 Ke5 37. b4 Ne6 38. Rd7
ECO B03 in 2002 play it! marjanovic slavo defeats black's galaras anestis in 61 moves	1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 e6 7. Nf3 Bb4+ 8. Nc3 c5 9. Bg5 Qc7 10. d5 exd5 11. cxd5 c4 12. Qd4 Bf5 13. d6 Qc8 14. O-O-O Bxc3 15. Qxc3 O-O 16. Nd4 Bg4 17. Rd2 N8d7 18. h3 Be6 19. Nxe6 fxe6 20. Rc2 Rf5 21. Be7 Nxe5 22. g4 Nd5 23. Qg3 Rf4 24. Kb1 Re4 25. Bg5 Nb4 26. Bg2 Qc6 27. Rd2 Qa6 28. Qa3 c3 29. Qxa6 cxd2 30. Bxe4 Nxa6 31. Bxb7
ECO B03 in 1975 play it! marjanovic slavo defeats black's rogulj branko cr in 59 moves	1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Be3 Bf5 8. Nc3 e6 9. Nf3 Be7 10. d5 exd5 11. cxd5 Nb4 12. Nd4 Bd7 13. e6 fxe6 14. dxe6 Bc6 15. Qg4 Bh4+ 16. g3 Bxh1 17. O-O-O O-O 18. gxh4 Qf6 19. Bb5 Bc6 20. Bg5 Qe5 21. e7 Rfe8 22. Nf5 h5 23. Qxb4 Qxf5 24. Bd3 Qe6 25. Bc2 Qg4 26. Qc5 Qf3 27. Qe5 Qg4 28. Bf5 Rxe7 29. Bxe7 Qg2 30. Be6+
ECO B03 in 1973 play it! marjanovic slavo defeats black's cooper john gran in 81 moves	1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 Bf5 6. Nc3 e6 7. Nf3 Be7 8. Be3 O-O 9. Bd3 Bxd3 10. Qxd3 d5 11. c5 Nc4 12. b3 Nxe3 13. Qxe3 b6 14. Na4 c6 15. O-O Nd7 16. b4 a5 17. a3 Qc7 18. Nb2 Qb7 19. Nd3 Ra7 20. f5 exf5 21. e6 Nf6 22. exf7+ Rxf7 23. Qe6 Qd7 24. Qxf7+ Kxf7 25. Nde5+ Kg8 26. Nxd7 Nxd7 27. cxb6 Nxb6 28. Ne5 Bf6 29. Nxc6 Rc7 30. b5 Nc4 31. Rxf5 Kf7 32. Re1 Nxa3 33. Rxd5 Nc2 34. Rb1 Ke6 35. Rh5 Nxd4 36. b6 Rb7 37. Nxa5 Rb8 38. Kh1 h6 39. b7 Bd8 40. Nb3 Nf5 41. Nc5+
ECO D02 in 1978 play it! marjanovic slavo defeats black's stoica valentin in 63 moves	1. d4 d5 2. Nf3 Nf6 3. c4 dxc4 4. e3 g6 5. Qa4+ Nbd7 6. Bxc4 Bh6 7. g4 Nxg4 8. Rg1 Nf6 9. Nc3 c6 10. Qc2 Qa5 11. a3 Nb6 12. Bd3 Qh5 13. Rg3 Be6 14. Be2 Bc4 15. Bd1 Nfd5 16. Ne4 Qf5 17. Ne5 Bb3 18. Qxb3 Qxe4 19. Bf3 Qh4 20. e4 Bxc1 21. Rxc1 O-O 22. exd5 Qxd4 23. Qc3 Qxc3+ 24. Rxc3 f6 25. Ng4 cxd5 26. Rc7 Kg7 27. Ne3 Rf7 28. Nxd5 e5 29. Rxf7+ Kxf7 30. Nxb6 axb6 31. Bxb7 Rb8 32. Bd5+
ECO D31 in 1999 play it! marjanovic slavo defeats black's hadzic j in 65 moves	1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nc6 5. Bf4 a6 6. e3 Nf6 7. Rc1 dxc4 8. Bxc4 Nd5 9. Bg3 Nxc3 10. bxc3 O-O 11. O-O b5 12. Bd3 Bb7 13. c4 f5 14. cxb5 axb5 15. Bxb5 Qd5 16. Bc4 Qd7 17. Qb3 Nd8 18. Bxc7 Bd5 19. Bxd5 Qxd5 20. Rc4 Nc6 21. Rfc1 Na5 22. Bxa5 Rxa5 23. Ne5 Rb5 24. Qc2 Ba3 25. Rb1 Rxb1+ 26. Qxb1 Bd6 27. Qc2 Bxe5 28. Rc5 Qb7 29. Rxe5 Rc8 30. Rc5 Ra8 31. g3 h6 32. Qc4 Qd7 33. Rc7
ECO D02 in 1995 play it! marjanovic slavo defeats black's djukic zeljko in 87 moves	1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 Nbd7 5. e3 a6 6. a3 dxc4 7. Bxc4 b5 8. Ba2 Bb7 9. O-O Be7 10. Qe2 c5 11. Rd1 cxd4 12. Nxd4 b4 13. axb4 Bxb4 14. e4 Bxc3 15. bxc3 O-O 16. e5 Nd5 17. Bxd5 Bxd5 18. c4 Bb7 19. Ba3 Re8 20. Rab1 Qc8 21. Rb3 f6 22. exf6 Nxf6 23. Qe5 Ng4 24. Qg5 h5 25. h3 Nf6 26. Rg3 Qc7 27. Bd6 Qf7 28. Be5 Kh7 29. Qf4 Rac8 30. Nb3 Bc6 31. Ra1 Ra8 32. Ra5 Rf8 33. Nd4 Bd7 34. Nf3 Kg8 35. Ng5 Qg6 36. Qd4 Rad8 37. Ne4 Ng4 38. hxg4 h4 39. Rd3 Bc6 40. Nd6 Rb8 41. Rxa6 Rb1+ 42. Rd1 Rf4 43. Qxf4 Rxd1+ 44. Kh2
ECO A40 in 1988 play it! marjanovic slavo defeats black's arapovic vitomir in 71 moves	1. d4 g6 2. e4 Bg7 3. Nc3 d6 4. f4 c6 5. Nf3 Bg4 6. Be3 Qb6 7. Qd3 Bxf3 8. gxf3 Nd7 9. O-O-O Qa5 10. Kb1 Ngf6 11. h4 O-O-O 12. Bh3 Kb8 13. Rdg1 e6 14. f5 e5 15. f4 Rhe8 16. dxe5 dxe5 17. fxg6 fxg6 18. f5 Bf8 19. fxg6 Bb4 20. g7 Nb6 21. Bxb6 Qxb6 22. Na4 Qa5 23. Qf3 Ng8 24. Qb3 Nf6 25. a3 Bd2 26. Be6 b5 27. Nc5 Qb6 28. Nd7+ Nxd7 29. Bxd7 Rxd7 30. g8=Q Rxg8 31. Rxg8+ Kc7 32. Rd1 Qd4 33. Qe6 Kb6 34. Rg2 Rd6 35. Qe8 Qxe4 36. Qb8+