kylemeister wrote on 05/10/13 at 14:48:21:

Scarblac wrote on 05/07/13 at 14:25:36:

And is there any specific theoretical problem with 6.Bg5 e6 7.Qd2 Be7 8.0-0-0 0-0, or is it just considered slightly better for white in general?

That line has always seemed obviously correct to me (what can possibly be wrong with straightforward development?), but of course chess isn't such a simple game.

I can't claim to be up on the most recent tries, but some time ago I became accustomed to seeing it considered as falling into the "+= with best play" category. I notice that Wang Hao is playing (via an alternative move order) one of the old main sublines (9. f4 Nxd4 plus ...Qa5 and ...Bd7-c6) today against Karjakin.

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O Nxd4 9. Qxd4 O-O 10. f4 Bd7 11. Bc4 Qa5 12. e5 dxe5 13. fxe5 Bc6 14. Bd2 Nd7 15. Nd5 Qc5 16. Nxe7+ Qxe7 17. Rhe1 Nb6 18. Bf1 Rfd8 19. Qf4 Rac8 20. Kb1 Ba4 21. b3 Qc5 22. c4 Rd4 23. Be3 Rxf4 24. Bxc5 Bc6 25. Kb2 h5 26. g3 Rg4 27. Be3 Bf3 28. Rd4 Rxd4 29. Bxd4 g5 30. a4 Rd8 31. Kc3 Nc8 32. b4 a6 33. Bc5 g4 34. b5 axb5 35. axb5 Kg7 36. Bd3 f5 37. exf6+ Kxf6 38. Bd4+ Kf7 39. h4 1-0

[Event "Moscow ol (Men)"]

[Site "Moscow"]

[Date "1994.??.??"]

[Round "13"]

[White "Adams, Michael"]

[Black "Kramnik, Vladimir"]

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

[ECO "B65"]

[WhiteElo "2640"]

[BlackElo "2725"]

[Annotator "Speelman,J"]

[PlyCount "107"]

[EventDate "1994.12.01"]

[EventType "swiss"]

[EventRounds "14"]

[EventCountry "RUS"]

[Source "ChessBase"]

[SourceDate "1995.04.01"]

1. e4 {Boensch Ftacnik Hecht Ernst} c5 2. Nc3 Nc6 3. Nf3 d6 4. d4 cxd4 5.

Nxd4 Nf6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O Nxd4 9. Qxd4 O-O 10. f4 Qa5 11. Bc4 Bd7

12. e5 dxe5 13. fxe5 Bc6 14. Bd2 Nd7 15. Nd5 Qc5 16. Nxe7+ Qxe7 17. Rhe1 Rfd8

18. Qg4 (18. Bf1 {Boensch} Nf8 19. Qe3 Qh4 20. h3 Ng6 21. c4 Rd4 22. g3 Rxc4+

23. Bc3 Qe4 24. Qd2 Qd5 25. Qxd5 Rxc3+ 26. bxc3 Bxd5 $10 {Yudasin,L-Kotronias,

V Moscow olm (04) ISR-GRE 1994 1/2 64 -CBM 45}) 18... Nf8 (18... Nb6 19. Bf1

Qc5 20. Qb4 Qf2 21. Qf4 Qxf4 22. Bxf4 $14 {Tseshkovsky,V-Yudasin,L/URS-ch/1986/

1/2-1/2/42}) 19. Bd3 (19. h4 $5 $146 Qc5 20. Bc3 $1 h5 $2 21. Qe2 $1 Bxg2 22.

Rxd8 Rxd8 23. Bd3 $1 Bh3 $8 24. Qxh5 f5 25. Qf3 Bg4 26. Qxb7 $16 {Sherzer,

A-Rachels,S/USA-ch/1992/1:0/38}) (19. Bf1 Qc5 $1 20. Bc3 Ng6 21. Qg5 Rd5 22.

Rxd5 Bxd5 23. a3 Rc8 24. Qe3 Qc6 25. g3 a6 26. Be2 Ne7 27. Qg5 Qc7 $10 {Kamsky,

G-Anand,V/Linares/1993/0:1/68}) 19... Rxd3 (19... Qc7 {Boensch} 20. Bb4 Bd5 21.

Kb1 Rac8 22. Bd6 Qc6 23. b3 b5 24. Re3 Ng6 25. h4 $40 {Tatai,S-Epishin,V

Reggio Emilia (06) 1994 1-0 42 - CBM 45}) 20. cxd3 Qd7 (20... Qc5+ $5 21. Kb1

Qd5 $44) (20... Ng6 {Boensch} 21. Kb1 Qd8 22. Bc3 a5 23. g3 Ne7 24. Bd4 Qd5 25.

Bg1 {Der Plan Bd4-g1 verspricht keinen Vorteil.} a4 26. Qb4 Qd8 27. Bb6 Qd7 28.

Bc5 Nd5 29. Qd4 Qd8 30. Rf1 Qg5 31. Rf2 Rd8 32. Ka1 h6 $10 {Anand,V-Lobron,E

Manila olm (13.06.1) 1992 1/2 52}) 21. Bb4 (21. Kb1 Qxd3+ $6 22. Ka1 $14 {

Ivanchuk,V-Anand,V (07)/Linares m/1992/1:0/51} (22. Ka1 {Boensch} h5 (22... Qf5

23. Qg3 Ng6 24. Bc3 h6 25. Rf1 Qe4 26. Rd2 Bd5 27. b3 Rc8 28. Kb2 a6 29. Rdf2

Rc7 30. Re1 Qh4 31. Qxh4 Nxh4 $10 {Ivanchuk,V-Anand,V (7) Linares m 1992 1-0 51

}) 23. Qe2 (23. Qxh5 Ba4 24. Bc3 Bxd1 25. Rxd1 Qe4 26. Qf3 (26. Qg5 a5 27. Qd2

Ng6 28. g3 Ne7 29. Qd7 Nd5 30. Bd4 Qe2 31. Rc1 b5 32. Bc5 Qd3 33. Qc6 Rd8 34.

Bd6 Kh7 35. Qc5 Kg6 $1 36. h4 Rh8 $1 37. a3 Rh5 $17 {Oll,L-Hodgson,J Groningen

PCA (03) 1993 0-1 46}) 26... Qxf3 27. gxf3 Kh7 28. b4 Kg6 29. a4 Kf5 30. h4 Rc8

31. Kb2 g6 32. Rd4 Rc7 33. a5 $10 {Hracek,Z-Leko,P Brno (8) 1993 1/2 44}) 23...

Qxe2 24. Rxe2 Rd8 25. Rde1 Ng6 26. g3 a6 27. b3 Rd3 28. Kb2 h4 29. Kc2 Rd4 30.

Be3 Rg4 31. Bf2 hxg3 32. hxg3 Ne7 $10 {Almasi,Z-Zolnai,T HUN-ch (09) 1992 1/2

49})) (21. Re3 $5 {Ftacnik}) (21. Re3 {Boensch} Qd5 22. Kb1 Ng6 23. Bc3 (23.

Rg3 Qxe5 24. Bc3 Qb5 25. h4 h5 26. Qe2 Bd5 27. b3 a5 28. Qxh5 a4 29. Rxg6 fxg6

30. Qxg6 Qd7 31. b4 $14 {Stefansson,H-Kotronias,V Reykjavik op (03) 1994 1/2 51

}) 23... Qxg2 24. Qxg2 Bxg2 25. Rg3 Bc6 26. Rdg1 Rd8 27. Kc2 Rd7 28. b3 Kh8 29.

Rg4 Ne7 30. Rd4 Bd5 31. Rf4 Nf5 32. Kd2 Bc6 33. a4 h6 34. Rxf5 exf5 35. Rxg7

Rxd3+ 36. Kxd3 {1/2-1/2 Ivanov,AV-Rachels,S/USA-ch (1) 1989}) 21... Qd5 22.

Bxf8 Rxf8 23. Kb1 Qxg2 24. Qxg2 (24. Qh4 $1 {Ernst} g6 25. Re3 Bd5 26. Rh3 h5

27. Rc1 $14 {Psakhis,L-Greenfeld,A/Tel Aviv/1991} (27. Rc1 {Boensch} Qd2 28. b3

a5 29. Qf6 a4 30. Rg3 axb3 31. Rxg6+ $10 {Psakhis,L-Greenfeld,A Tel Aviv (04)

1991 1/2 37})) (24. Qf4 {Ernst}) 24... Bxg2 25. Rc1 Bc6 26. Kc2 (26. Rc4 Rd8

$146 (26... f5 27. exf6 Rxf6 28. h4 h6 29. Rg1 Kf7 30. h5 Kf8 31. Kc2 Rf5 32.

Rcg4 Rf7 33. Kc3 Bf3 34. Rg6 Rc7+ 35. Kd2 Bxh5 $10 {Georgiev,Ki-Gurevich,D/

Palma de Mallorca/1989/1/2-1/2/59}) 27. Kc2 g6 28. Kc3 Kg7 29. b4 h6 30. Rc5 a6

31. Ra1 g5 32. a4 Bf3 33. Rc7 Kg6 34. d4 Rf8 35. Rf1 g4 36. Kd2 f5 $6 37. exf6

Rxf6 38. Re7 h5 39. Ke3 h4 40. Rf2 Bc6 41. Rf4 $1 $16 {Palac,M-Lisenko,A/

Vinkovci/1993/1/2-1/2/81}) 26... f5 {And finally the two players began to play

their own moves! I must say that this particular variation is a very strange

choice as Black has no winning chances whatsoever. In addition, as the game

shows, white has reasonable winning chances. After all, if a 2700 player such

as Kramnik cannot hold this endgame, what chance has a mere mortal 2500 player?

} 27. exf6 {White would have no winning chances if Black were allowed a passed

f-pawn.} Rxf6 28. Rf1 Rh6 (28... Rxf1 $2 {Boensch} 29. Rxf1 {/\ Kc3-d4-e5 +-})

29. Rf2 Rh3 30. Kc3 h6 (30... Bb5 {Ftacnik} 31. Rd1) 31. Kd4 Kh7 32. b3 g5 33.

Rcf1 Kg6 (33... Bb5 {Ftacnik} 34. Rf7+ Kg6 35. Rxb7 $16) (33... Bd5 $2 {Boensch

} 34. Rf7+ Kg6 35. R1f6+ Kh5 36. Rh7 $18) 34. Rf6+ Kh5 35. Rxe6 Rxh2 36. Rff6 (

36. a4 {Boensch} Kg4 $10) 36... Rxa2 37. Rxh6+ Kg4 38. Re5 Rg2 39. Rg6 Kh4 (

39... Kf4 {Ftacnik} 40. Rf6+ Kg4 41. Ke3 Rg3+ 42. Kd2 Rg2+ 43. Kc3 Rg1 44. d4

$16) 40. Rh6+ Kg4 41. Rg6 (41. Rh8 {Ernst} Kf4 $10) 41... Kh4 {And here most

observers expected the game to end in a draw by three fold repetition after 42.

Rh6+. However, as both Short and Hodgson had lost to Kasparov and Tiviakov by

now, Adams was forced to find a way to fight on.} 42. Re3 g4 43. Ke5 Rf2 (43...

Rd2 {Ernst}) (43... g3 {Ftacnik} 44. d4 $1) 44. d4 Rd2 45. Rh6+ Kg5 46. Rh8 (

46. Rd6 $5 {Boensch}) 46... Bf3 47. Rf8 Bc6 48. b4 b6 (48... a6 {Ernst} 49. Rd8

{/\ 50.d5} (49. Rd8 {Ftacnik} Bf3 50. d5 $16)) 49. Rd8 a5 50. d5 Rxd5+ (50...

Ba4 {Ftacnik} 51. bxa5 bxa5 52. d6 $16) 51. Rxd5 Bxd5 52. bxa5 $4 {# throwing

away the win.} (52. Kxd5 Kf4 (52... axb4 53. Ke4 Kh4 54. Kf4 $18) (52... a4 53.

b5 Kf4 54. Ra3 g3 55. Rxa4+ $18 Kf3 56. Kc6 g2 57. Ra1) 53. Re1 $1 (53. Re4+ {

Ernst} Kf3 $10) (53. Re6 {Hecht} Kf3 $2 (53... g3 $1 54. Rxb6 (54. b5 g2 55.

Rg6 Kf3 56. Kc6 a4 57. Kxb6 a3 58. Rf6+ Ke2 59. Re6+ Kf2 60. Rf6+ Kg1 61. Kc7

a2 62. Ra6 $10) 54... axb4 (54... a4 55. Rc6 g2 56. Rc1 Ke3 57. b5 Kf2 58. b6

$18) 55. Kd4 g2 56. Rg6 Kf3 57. Kd3 Kf2 58. Rf6+ Ke1 $10) 54. b5 $1 g3 55. Rxb6

g2 56. Rg6 a4 57. Kc4 $18) 53... axb4 $8 (53... Kf3 54. b5 $1 g3 55. Kc6 g2 56.

Kxb6 Kf2 57. Ra1 a4 58. Ka5 $1 $18 (58. Ka5 {Ftacnik} a3 59. Ra2+ (59. Ka4 $18

{Boensch}) 59... Kf1 60. Rxa3 g1=Q 61. Ra1+ $18)) 54. Kd4 $1 Kf3 (54... g3 55.

Rf1+ Kg4 56. Ke3 g2 57. Rg1 Kg3 58. Rb1 Kh2 59. Kf2) 55. Kd3 $1 g3 (55... Kf2

56. Re2+ $1 Kf3 (56... Kf1 57. Ke3 g3 58. Kf3) 57. Re6 g3 58. Rf6+ Kg2 59. Ke2)

56. Rf1+ Kg2 57. Ke2 Kh2 58. Rb1 g2 59. Kf2 {And the Black have been blockaded

and will shortly run out of moves.} (59. Kf2 b3 60. Rg1 $18)) 52... bxa5 53.

Kxd5 Kf4 54. Ra3 (54. Re8 {Boensch} g3 55. Rf8+ Ke3 $10 (55... Kg4 $2 56. Ke4

g2 57. Rg8+ Kh3 58. Kf3 $18)) 1/2-1/2

The game Adams - Kramnik had a strong impact on this line.