[Event "?"]
[Site "?"]
[Date "2010.02.24"]
[Round "?"]
[White "Tarrasch_9 Bg5"]
[Black "9...cxd4"]
[Result "*"]
[ECO "D34"]
[Annotator "Rybka 3.1, Ametanoitos, Cheesemate"]
[PlyCount "38"]
[WhiteTeam "Khalifman"]
[BlackTeam "Sokolov, Keilhack"]
[TimeControl "40/5400+30:100/1800+30:1800"]

{319MB, Fritz11.ctg, GANDALF} 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3
Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 cxd4 10. Nxd4 h6 11. Be3 Bg4 {
Ame: Spassky's move. "It is not clear to me why this logical move hasdisappeare
d from grandmaster practice" (page 102) and "As explained in Petrosian-Spassky
(Game 23), 11...Bg4 is definately worth analysing" , (page 121) Sokolov 
Cheesemate: GM Marjanovic is the master of ceremony in the 11...Bg4-variation
and played many games with it. So there is a strong player who constantly
believes in it for many years. An argument, that should count.   Keilhack/^s
conclusion is: "Whether the often proved richness of possibilities compensates
for the theoretical soft spots of this variation, every player has to decide
on his own."} 12. Nb3 (12. Qa4 Na5 ({Keilhack} 12... Qd7 {
which offers d5 (and if white takes (tactical option) - best with} 13. Bxd5 {
the conclusion is that black is worse but only in relatively slight dimensions}
({or alternatively with} 13. Nxd5) ({After} 13. Rfd1 {(positional option) an
interesting game with tactical possibilities rises. There are structural or
theoretical defects in black/^s position but there are tactical or practical
chances too.})) 13. Rad1 Nc4 14. Bc1 {Khalifman and Cox} Nb6 $1 $11 {Sokolov} (
{Keilhack} 14... Qc8 15. Qb5 $1 Nb6 16. Bf4 $1 $14 {Stull-Poulsen, Corr 1989})
15. Qb3 {Keilhack: Obviously passive.} Rc8 $1 {Sokolov} (15... Qd7 {Keilhack: s
eems logical, but it is not good due to the shaky position of the Nb6} 16. Be3
Bc5 $6 {Keilhack} 17. Ne6 $1 Qxe6 18. Bxc5 Rfd8 19. Rfe1 Rd7 20. Bxb6 Qxb6 21.
Qxb6 axb6 22. Rd4 Be6 23. Red1 $16 {
Khalifman: with an obvious stregical advantage, Vadasz-Szilagyi, Hungary 1974}
{Rybka 3 1-cpu 32-bit : 1)} Rc8 ({Rybka 3 1-cpu 32-bit : 5)} 23... g5 24. Rb4
Kg7 25. e3 Rc7 26. Rxb6 Ne4 27. Bxe4 dxe4 28. Kg2 Bg4 29. Rdd6 Bf3+ 30. Kg1 h5
31. Rb5 f6 32. Rbb6 Rf7 {[%eval 123,15]}) ({Rybka 3 1-cpu 32-bit : 2)} 23...
Kf8 24. Rb4 Rc8 25. Bf3 Rc6 26. Kg2 g6 27. a3 Kg7 28. e3 Kg8 29. Rbd4 Rc4 30.
Na4 {[%eval 110,20]}) ({Rybka 3 1-cpu 32-bit : 3)} 23... g6 24. e3 Rc7 25. a3
Ra5 26. Bf3 Kg7 27. Kg2 Rac5 28. h3 Rc4 29. g4 Rd7 30. R1d2 Rc5 31. R4d3 Rd8 {
[%eval 111,20]}) ({Rybka 3 1-cpu 32-bit : 4)} 23... Rad8 24. Na4 Rc7 25. Nxb6
Rc2 26. R4d2 Rxd2 27. Rxd2 Rd6 28. Na4 Rc6 29. Nc3 Ne4 30. Bxe4 dxe4 31. Nxe4
Bxa2 32. f3 Be6 33. Kf2 Rb6 34. Nc5 Kf8 35. e4 Ke7 36. Ke3 Rb5 {[%eval 117,20]}
) ({Rybka 3 1-cpu 32-bit : 5)} 23... Rc7 24. a3 Kf8 25. Nxd5 Bxd5 26. Bxd5 Rc2
27. Bxb7 Re8 28. Bf3 Rxb2 29. Rc1 Ra2 30. a4 g6 31. Kg2 Kg7 32. Rc6 Re6 33.
Rxe6 fxe6 34. Rb4 Nd7 35. Bc6 Nc5 {[%eval 121,20]}) 24. Bf3 Kf8 25. Kg2 g6 26.
a3 Kg7 27. Rb4 Rc6 28. e3 Kg8 29. h3 Kf8 30. g4 Kg7 31. Ra4 Rc5 {[%eval 111,21]
}) 16. h3 ({Ame} 16. Bf4 Qd7 $5 ({Ame} 16... Rc4 $11 {with the idea Rb4 or Bc5}
17. a3 Bd6 $11 {Ame}) 17. Ndb5 a6) 16... Bd7 17. Kh2 Rc4 $1 $11 {Sokolov})
12... Be6 13. Rc1 Re8 {
Cheesemate/Keilhack: move order into 11...Re8 12.Rc1 Bg4 13.Nb3 Be8} 14. Re1 ({
Keilhack} 14. Bd4 $5 Nxd4 15. Qxd4 {Cheesemate: the queen is centralized and
white plan Nc5 and/or Rfd1. The bishop as a blockader is unusual but it is
difficult to handle for black who is tied to d5 and has to keep an eye on
options like Bxf6 chopping down a defender or white manoeuvres behind the
bishop.}) 14... Qd7 15. Bc5 Rac8 (15... Rad8 {Geller (Cheesemate/Keilhack)})
16. Bxe7 Qxe7 17. e3 Red8 {Kramnik- Illeskas Cordoba 1994} 18. h3 $1 $146 {
...securing White a small advantage", Sokolov} (18. Qe2 Bg4 $1 $11 {
Sokolov (Petrosian-Spassky, 1969)} 19. f3 (19. Qf1 $5 {Keilhack})) {Ame} 18...
Ne4 {Cheesemate: isn/^t connected to really active options (but I only had it
on the board and tend to overlook deeper tactics), white has smothered some of
your possibilities with h2-h3. Because black has no dark bishop, the slight
weakening of white/^s king/^s fortress, which in other variations (with dark
bishop on board) gives attacking possibilities, is not an unsurmountable
problem if he is aware of the sting against h3 (e.g. with Qd7 in combination
with Ne4's kick on f2). So white shouldn/^t hurry.} ({Ame} 18... Ne5 19. Qe2 ({
Ame} 19. Kh2 a6 ({Ame} 19... Nc4) 20. Qe2 b5) 19... Ne4 20. Nxe4 dxe4 21. Bxe4
Bxh3) 19. Nd4 ({Ame} 19. Qe2 Bf5 20. Red1 ({Cheesemate} 20. Nb5 {
overprotecting d4}) 20... Nxc3 21. Rxc3 d4) ({Cheesemate} 19. Re2 {
protecting f2 with a glance on c2 too, perhaps later again with sth. like Nb5.}
) 19... Qf6 $11 {Ame with Firebird 1.1} *

