There happens to be a simple system against the Caro Kann, in which you play a Carlsbad structure and you try to keep his lsB inside the pawn chain. Then you can develop a good attack against his king while he has a minority attack on the queenside.
Apparently it doesn't have a good reputation, but knowing that the Caro Kann is a relatively rare defence it would make sense for club players to not spend too much time studying theory on it.
No offense, but the caro-kann isn't a rare defense. It's quite popular among tournament players. 
Can anyone suggest me what to play against the caro Kann?
Which variation should I prefer the 2.c4 or 2.d4?
And after what? Can I learn a system against it ?
2. c4 usually leads to the Panov-Botvinnik attack or similiar variations. 2. d4 is usually more flexible, and branches out to different variations, such as the (Capablanca Variation) classical mainline:
1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5
4... Nd7 was often used by Petrosian and Karpov if I remember correctly.
It seems the fad nowadays is the advance variation though which goes:
1. e4 c6 2. d4 d5 3. e5
Magnus Carlsen even has a few games using the advance variation. Anyway, I hope that helps somewhat.
I like to play the Caro-Kann as Black very much. Black's development in it is usually very solid and also straightforward (without much complexities), but also predictable from White's point of view. As White, you may choose some of the following:
- the Panov Attack: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4:
In this variation Black may isolate White's d pawn by ...dxc4. Black may play ...e6 to develop his dark squared bishop, or ...g6 (as in the Gurgenidze variation). White has good attacking chances on the kingside, while Black may seek counterplay on the queenside.
- the Advance variation: 1.e4 c6 2.d4 d5 3.e5:
Black usually plays 3...Bf5 and then there's an exchange of light squared bishops. White may play 4.Bd3 Bxd3 5.Qxd3 but Black can play ...e6 without shutting the bishop in. Another option is the Bayonet attack which is 4.Nc3 e6 5.g4 and then play can continue 5...Bg6 6.h4 h6 7.h5 Bh7 8.Bd3 Bxd3 9.Qxd3.
- the Karpov variation (I like this one for Black but White doesn't often go into it, at least in my games): 1.e4 c6 2.d4 d5 3.Nc3 (or 3.Nd2 dxe4 4.Nxe4 Nd7) dxe4 4.Nxe4 Nd7:
This allows Black to play ...Ngf6, then exchange a pair of knights on e4 simplifying the position, and then play ...Nf6 to attack e4 again.
Those are some of the main options for the Caro-Kann. It depends on your preferences what to play, but it's not very easy to get an edge as White against this opening.
White should try to prevent Black from (or at least delay) playing ...e5 or ...c5, which are Black's means of opening the center and equalizing (...e5 often preferable but usually harder to achieve). White can use the semi-open e file, and may try to use e5 as a drop-off point for heavy pieces (a rook lift Re1-e5-h5 for example) as f7-f6 is usually not good for Black, or place a minor piece on e5.
Thank you all.
Can you suggest me a book for caro Kann?
I think I will start play it in blitz games.
I prefer the 2.d4 after 2...d5 you can proceed with 3.Nc3, 3.Bd3 etc
^ But Bf5 really does not look natural. I would simply develop a Knight.
Also I'm not really convinced by the exchange variation, where white gives up a centre pawn for the c pawn. Like it does in the sicilian, but without getting the space advantage in return.
Having said that, the system I was referring to is an exachange variation, but with immediate Bd3. Reason I would play this it's mainly its simplicity, but I should really learn the Panov.
Thank you.
Any book?
Sorry to be uncooperative here but I don't think you need a specialized book on any opening at this point. There's plenty of games and articles about the CKD here and at other websites, and an all around reference manual like MCO-15 will have plenty of CKD material for you (and you can look up any other opening in it!) Right now you need to concentrate on learning the basic concepts of each CKD variation and also working on other aspects of the game like endgames, middlegames, tactics etc.
If you wanna read a chess book read My System by Nimzovitch or something else by a reputable writer about improving your game in general. Even reading a basic endgame book would be more useful, once you learn basic endgames and endgame principles you'll know something that won't get refuted or outmoded like a lot of opening theory does all the time. Trust me on this one, I've used several specialized opening books over the years and you'd be surprised how fast some players will find moves that are not in your book, no matter how comprehensive it is.
i suggest horowitz as a good chess book.....
Thank you NimzoRoy
I will follow your advice.
You know something more than me.
I am going to find books who are going to help my improve my game generally.
No offense, but the caro-kann isn't a rare defense. It's quite popular among tournament players.
Everybody claims everything is rare. This disease is not limited to people that post about chess but we seem to have it especially bad.
Both of the Advance lines given for White by k_kostov are pretty bad. White does well to keep the light-squared Bishop and normally develops it to e2. I think Black should fight for space on the kingside, always meeting h4 with h5 and not with h6.
In the Exchange variation with 4.Bd3 Nc6 5.c3 Qc7 or 5...g6 Black has no trouble getting out the light-squared Bishop, and even in the old main line develops it to g4-h5-g6. I don't see how White can stop Black from developing the Bishop in the Exchange variation. And in the Panov, nobody has mentioned that Black can develop the Bishop to g4 in the mainline: 4.c4 Nf6 5.Nc3 Nc6 6.Nf3 (6.Bg5!?) 6...Bg4.
The line with 2.Nf3 d5 3.exd5 cxd5 4.Ne5 is terrible. It was played against me by a weak player (I think his rating was a bit under 1900) and I got a -/+ position out of the opening, and in postgame analysis he made the hilarious comment that he thought he was still better around move 15 and tried to figure out where he went wrong after that.
1. e4 c6 2. Nf3 d5 3. exd5 cxd5 4.Ne5 breaks one of the basic rules in chess and that is not to move the same piece twice in the opening unless you have a very good reason.
That Black might blunder and fall into a trap is not sufficient reason because if Black does not blunder he already has at least an equal game or better.
Another good line for Black is 4...Nc6 5.d4 e6 6.Bb5 Bd7 showing that White's entire opening strategy is ill-suited for an advantage even when he can carry out his plan. This line is no more than equal, but when White plays f4 Black can play for a win too.
I used to play this Ne5 stuff. I appreciate the idea behind it, that White is trying to improve on the Fischer-style exchange variation by putting the N on e5 right away and playing around it, as opposed to developing with moves such as d4,Bd3,Bf4,h3 and trying to acheive the Nf3-e5 later.
In practice though it doesn't really work. Not only is the defensive formation with ..Nf6 and ..g6 proven to be solid, but Black can play in a more straightforward style as well and reach a decent position:
For a book, you can check out amazon.com for Caro-Kann books and read the reviews. I have "Caro-Kann Move by Move" by Lakdawala, but it's written from Black's point of view.
As for what variation to play, it depends on your style. If you are comfortable with isolani positions you can choose the Panov Attack, if you want a more complex, double-edged game you can play the Advance variation (3.e5), if you want a more stable position with +/=, I'd say you go for 3.Nc3... Check out some games and find out what you like most.
Can anyone suggest me what to play against the caro Kann?
Which variation should I prefer the 2.c4 or 2.d4?
And after what? Can I learn a system against it ?