NeverGiveUp wrote on 11/30/10 at 15:08:11:

There has however been an article in NIC yearbook about 5. ... Bg4 stating that with Yandemirov's novelies black is OK.

Maybe this article is a bit dated now. These games of Yandemirov as black were played after the NIC article you mention:

[Event "20th European Club Clup"]

[Site "Izmir TUR"]

[Date "2004.10.07"]

[EventDate "2004.10.03"]

[Round "5"]

[Result "1/2-1/2"]

[White "Pavel Smirnov"]

[Black "Valeri Yandemirov"]

[ECO "C72"]

[WhiteElo "2626"]

[BlackElo "2488"]

[PlyCount "193"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O Bg4 6. h3 h5

7. d4 b5 8. Bb3 Nxd4 9. hxg4 Nxb3 10. axb3 hxg4 11. Ng5 Qd7

12. c4 Rb8 13. Rxa6 f6 14. Nc3 fxg5 15. Nxb5 Nf6 16. Ra7 Rc8

17. Re1 Qf7 18. Be3 Qh5 19. Kf1 Kd7 20. b4?! Qh1+ 21. Ke2 Qxg2

22. Qa4 Kd8 23. Nxc7 Rxc7 24. Qa5 Ne8 25. Kd2 Kd7 26. Qb5+ Ke7

27. Rxc7+ Nxc7 28. Qb7 Kd7 29. Bb6 Be7 30. Qxc7+ Ke6 31. Qb7

g3 32. Re2 Rh2 33. Qc8+ Kf7 34. Qg4 Qg1 35. Qxg3 Qb1 36. Kc3

Rh1 37. Qd3 Rc1+ 38. Rc2 Rd1 39. Rd2 Rc1+ 40. Kb3 Qa1 41. c5

dxc5 42. bxc5 Kg6 43. Rc2 Rd1 44. Qf3 Rd4 45. Rc4 Rd2 46. Qc3

Rxf2 47. c6 Rf6 48. c7 Rxb6+ 49. Kc2 Rd6 50. Qf3 Rb6 51. Qf5+

Kh6 52. Qxe5 Bf6 53. c8=Q Rxb2+ 54. Qxb2 Qxb2+ 55. Kd1 Qb3+

56. Kd2 g4 57. Qe6 Qf3 58. e5 Qf2+ 59. Kd3 Qf3+ 60. Kd4 Qd1+

61. Kc5 Qe2 62. Kd6 Kg5 63. exf6 Qxe6+ 64. Kxe6 gxf6 65. Kd5

g3 66. Ke4 g2 67. Rc8 f5+ 68. Kf3 g1=N+ 69. Ke3 Nh3 70. Rc6

Nf4 71. Kd4 Ng6 72. Rc1 Kf6 73. Ke3 Kg5 74. Kd4 Kf6 75. Kd5

Nf4+ 76. Kd6 Ng6 77. Re1 Nf4 78. Re8 Ng6 79. Ra8 Kf7 80. Kd5

Kf6 81. Ra6+ Kg5 82. Ke6 Nf4+ 83. Kf7 Nd5 84. Rg6+ Kh4

85. Rh6+ Kg5 86. Rh1 Ne3 87. Ke6 f4 88. Rg1+ Ng4 89. Rf1 Ne3

90. Rf2 Ng4 91. Rf1 Ne3 92. Rg1+ Ng4 93. Rf1 Ne3 94. Rg1+ Ng4

95. Kd5 Kf5 96. Kd4 f3 97. Rf1 1/2-1/2

Both players continued the discussion. Smirnov Improved at move 20:

[Event "European Club Cup"]

[Site "Feugen AUT"]

[Date "2006.10.11"]

[EventDate "2006.10.08"]

[Round "4"]

[Result "1-0"]

[White "Pavel Smirnov"]

[Black "Valeri Yandemirov"]

[ECO "C72"]

[WhiteElo "2623"]

[BlackElo "2528"]

[PlyCount "112"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O Bg4 6. h3 h5

7. d4 b5 8. Bb3 Nxd4 9. hxg4 Nxb3 10. axb3 hxg4 11. Ng5 Qd7

12. c4 Rb8 13. Rxa6 f6 14. Nc3 fxg5 15. Nxb5 Nf6 16. Ra7 Rc8

17. Re1 Qf7 18. Be3 Qh5 19. Kf1 Kd7 20. Qa1 Qh1+ 21. Ke2 Qxg2

22. Nxc7 Rxc7 23. Qa4+ Kd8 24. Qa5 Ne8 25. Kd2 Kd7 26. Qb5+

Ke7 27. Rxc7+ Nxc7 28. Qb7 Kd7 29. Bb6 Be7 30. Qxc7+ Ke6

31. Ra1 Qxe4 32. Ra7 Re8 33. Qd7+ Kf7 34. Qxd6 g3 35. fxg3

Qg2+ 36. Kc1 Qxg3 37. Bc5 Qf4+ 38. Kc2 Qf5+ 39. Kc3 Qf3+

40. Kb4 Qf6 41. Qd5+ Kg6 42. Qe4+ Kh5 43. Rxe7 Rxe7 44. Bxe7

Qxe7+ 45. c5 g4 46. Kb5 g3 47. c6 Qd6 48. Qh7+ Kg4 49. Qxg7+

Kf3 50. Qf7+ Ke3 51. c7 Qd3+ 52. Qc4 Qd7+ 53. Kb6 Qc8 54. Qa6

Qe6+ 55. Ka7 Qd7 56. Qb6+ Ke4 1-0

I supose an improvement over this is needed to play this line as black

Sorry for no PGN attachment, i'm at work now.