[Event "Quebec Open 1983"]  [White "Igor Ivanov"]  [Black "Borislav Ivkov"]  [Result "1-0"]  [ECO "E11"]  [WhiteElo "2552"]  [BlackElo "2465"]  [Annotator "ATH"]  [PlyCount "73"]  [EventDate "1983.07.??"]  [EventType "swiss"]  [EventRounds "8"]  [EventCountry "CAN"]  [SourceTitle "CFC 1983.09"]   1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 a5 5. Nc3 d5 6. e3 (6. Bg5 $1) 6... O-O  7. a3 Bxc3 8. Bxc3 b6 9. Bd3 Bb7 (9... Ba6 $1 10. Qe2 Nbd7 11. O-O Qe7 12. Rfd1  Rfc8 (12... c5 $1 $11) 13. Ne5 (13. Nd2 $1 $14) 13... c6 (13... c5 $1 $11) 14.  Nxd7 (14. b3 $1 $14) 14... Qxd7 15. b3 a4 16. bxa4 Bxc4 $6 (16... Qa7) 17. Bxc4  dxc4 18. Qxc4 Qa7 19. a5 bxa5 20. Rab1 (20. Rac1 $14) 20... c5 21. dxc5 Qxc5 $4  (21... Rxc5 22. Rb7 $14) 22. Rd8+ {Onischuk-Rios, Tromsø 2014}) 10. O-O Nbd7 (  10... dxc4 $1 $11) 11. Rc1 (11. b3 $1) 11... Ne4 (11... dxc4 $1 $11) 12. Qe2 (  12. Qc2 c5 13. cxd5 exd5 14. dxc5 Ndxc5 15. Bb5 $14) 12... Qe7 (12... dxc4 $1  $11) 13. Rfd1 (13. cxd5 $5) 13... Rfd8 (13... Nxc3 14. Rxc3 dxc4 $11) 14. Be1  c5 15. cxd5 Bxd5 ({Better is} 15... exd5 16. b3 Rdc8 17. Bb1 $14) 16. Bc4 (16.  Bb5 $1) 16... Bb7 $6 (16... Bxc4 $11) 17. dxc5 Ndxc5 18. Rxd8+ Rxd8 19. b4 axb4  20. axb4 Nd7 21. Qb2 (21. Bb3 $1 $14) 21... Ng5 $6 (21... Nd6 $1 22. Be2 Bd5  $11) 22. Nd4 $6 (22. Nd2 f5 23. Be2 Nf6 24. Nc4 $14) 22... Qf6 (22... Nh3+ $1  23. Kf1 (23. gxh3 Qg5+ 24. Kf1 Qg2+ 25. Ke2 e5 26. Bb5 Nb8 27. Bc3 h6 $1 $17)  23... Ne5 24. f3 Nxc4 25. Rxc4 e5 $11) 23. Bf1 (23. f4 $1) 23... Ne5 24. Kh1 $6  (24. Qc3 Nh3+ 25. Kh1 Ng4 26. f3 e5 $15) 24... Nef3 $2 (24... Ng4 $1 $17) 25.  Bc3 e5 26. Nxf3 Nxf3 27. Be2 Nh4 28. f3 Qg5 29. Bf1 Qxe3 $2 (29... Nf5 30. Bxe5  Nxe3 31. Bc7 Rc8 32. Qd2 $11) 30. Re1 Qh6 31. Bxe5 Qg6 (31... b5 {puts up a  better fight but Black is still in deep trouble}) 32. Qf2 Nf5 33. Bc7 Rc8 34.  Qxb6 Bc6 $2 (34... Qxb6 35. Bxb6 g6 {is another better defense that will  ultimately fail}) 35. b5 Bxb5 $2 36. Qxb5 h5 37. Qd7 1-0