How to play against an IQP

  [Event "weak pawns IQP: avoid exchange"]  [Site "weak pawns IQP: avoid exchang"]  [Date "1981.??.??"]  [Round "9"]  [White "Kortschnoj, Viktor Lvovich"]  [Black "Karpov, Anatoly"]  [Result "0-1"]  [ECO "D53"]  [WhiteElo "2695"]  [BlackElo "2700"]  [Annotator "Wch30-Merano"]  [PlyCount "86"]   1. c4 e6 2. Nc3 d5 3. d4 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. Rc1 dxc4 8. e3  c5 9. Bxc4 cxd4 10. exd4 $5 {[#]  Playing for the win.} Nc6 11. O-O Nh5 12.  Bxe7 Nxe7 13. Bb3 (13. Ne5) 13... Nf6 14. Ne5 Bd7 15. Qe2 Rc8 {[#]} 16. Ne4 $2  {The wrong plan, with no real justification. Keep the pieces on!} Nxe4 17. Qxe4  Bc6 18. Nxc6 Rxc6 19. Rc3 $6 (19. Rxc6 Nxc6 20. d5 {exchanges the IQP leaving  nothing much left to play for.}) 19... Qd6 20. g3 $6 Rd8 21. Rd1 Rb6 22. Qe1  Qd7 23. Rcd3 Rd6 24. Qe4 Qc6 25. Qf4 Nd5 {[#]} 26. Qd2 Qb6 27. Bxd5 $2 {The  Bishop was a compensating plus.} (27. a3 Ne7 28. Qf4 Nf5 29. d5 Ne7 30. Qe3 {  e.g.} Qxe3 31. fxe3 exd5 (31... Nxd5 32. e4) 32. e4 d4 33. e5 Rb6 (33... R6d7  34. e6) 34. Rf1) 27... Rxd5 28. Rb3 Qc6 29. Qc3 Qd7 {[#]} 30. f4 {looks  impetuous, but ...e5 was threatened} b6 31. Rb4 b5 32. a4 bxa4 33. Qa3 a5 34.  Rxa4 Qb5 35. Rd2 e5 36. fxe5 Rxe5 37. Qa1 Qe8 38. dxe5 Rxd2 39. Rxa5 {[#]  White has allowed a monster Rook on the seventh} Qc6 40. Ra8+ Kh7 41. Qb1+ g6  42. Qf1 Qc5+ (42... Qxa8 43. Qxf7+ Kh8 44. Qf6+ Kg8 45. Qxg6+ Kh8) 43. Kh1 Qd5+  0-1   

  [Event "IQP"]  [Site "Nottingham"]  [Date "1936.??.??"]  [Round "?"]  [White "Flohr, Salo"]  [Black "Vidmar, Milan Sr"]  [Result "1-0"]  [ECO "D62"]  [Annotator "Nottingham"]  [PlyCount "115"]  [EventDate "1936.08.10"]  [EventType "tourn"]  [EventRounds "14"]  [EventCountry "ENG"]  [Source "ChessBase"]  [SourceDate "1999.07.01"]   1. c4 {Here's a patient endgame win.} e6 2. Nc3 d5 3. d4 Nf6 4. Bg5 Be7 5. e3  O-O 6. Nf3 Nbd7 7. Qc2 c5 {[#] White pushes for an IPQ position, where Black  has the IQP} 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Bd3 g6 12. dxc5 Nxc5 {  [#]} 13. O-O Bg4 14. Nd4 Rac8 15. Qd2 a6 16. Bc2 Qg5 17. f3 Bd7 18. Rfe1 Rfd8  19. Rad1 Qf6 20. Bb3 Ba4 {[#] Black goes for an exchange of his poor Bishop,  which I expect is fair enough, but that's where it should have stopped.  But  if you dodge an exchange, you might give ground.} 21. Bxa4 Nxa4 22. Rc1 Nc5 23.  Red1 Qb6 24. Ne2 Nd7 25. Qd4 Qxd4 (25... Qb5 26. Nf4) 26. Nxd4 Ne5 27. b3 Kf8  28. Kf1 Rxc1 (28... Ke7) 29. Rxc1 Nc6 {[#] Black finds an interesting way of  sealing the c-file.} 30. Nxc6 Rc8 31. Rc5 bxc6 {[#] The IQP has disappeared,  but Black's problems have not -- Black has two weak pawns now instead of one!}  32. Ke2 Ke7 33. Kd3 Kd6 34. Ra5 Ra8 35. Kd4 f5 36. b4 Rb8 37. a3 Ra8 {[#]  White has got their pieces into good positions but has no way in at the moment  so opens up some lines.} 38. e4 fxe4 39. fxe4 dxe4 40. Kxe4 Ra7 $6 41. Kf4 h6  42. h4 Ke6 43. Kg4 Ra8 44. h5 g5 $6 45. g3 Ra7 46. Kf3 Ra8 47. Ke4 Ra7 48. Kd4  Kd6 49. Ke4 Ke6 {[#] Black has held the line well.} 50. Re5+ $1 Kd6 51. Re8 c5  (51... a5 $5 52. Rd8+ Ke6 53. Rh8) 52. Rd8+ Kc6 53. Rc8+ Kb6 54. Rxc5 Rh7 55.  Re5 Kc6 56. Re6+ Kb5 57. Kf5 Rf7+ 58. Rf6 1-0