QGD what is wrong with 3.c5?

1. d2-d4  d7-d5
2. c2-c4  c7-c6

I was thinking about playing 3. c4-c5
but I can't find any references to this option.
Probably it's a bad move?
Can someone explain please?

Thanks a lot,

Philip.

According to Fritz, it's not a too bad move, but already gives black a slight edge. For me (but I'm not an expert as you see from my rating) I see several disadvantages of this move:

- immediately relieves all pressure on the center and Black's worries about the d5 pawn

- White's d4 pawn can become weak

- the space advantage on the queenside doesn't really seem to help ... if you compare the French advance variation, the e5 pawn advance here creates quite a lot of trouble for black in inhibiting kingside development (Nf6), this is not the case with c5 - the b8 knight can develop to c6 or d7 as usual, the c7 bishop is a problem for black in the QGD generally with or without c5 ... the one and only plus point seems to be that black's thematic c5 push is inhibited, but this doesn't seem to outweigh all the disadvantages.

well b6 prepares a fianchettoed bishop and forces you to do something about the c5/b6 tension otherwise you lose a pawn for almost nothing. I think that's a pretty solid refutation of the early c5 by white.

In general you shouldnt release the central tension like that unless it : a) brings advantage or b) avoids disadvantage. 

How about development ?  Is it not better to bring out minor piece than push the same pawn again ?

 True. This sounds as the most important.

Thanks for your quick responses and useful comments.

I will just play the usual 3. Ng1-f3 for now then.

I encountered c5 in a few blitz games and usually replied 3...e5!? 

Maybe this is rubbish(i never looked at it seriously) but worked nicely in those games. Looks like an albin countergambit with a ridicolous c4-c5 extra move for W.

This line doesn't offer anything to White because the space advantage is illusory and the move fails to develop or control key squares.  c4-c5 points towards the d6 and b6 squares, neither of which White is in any position to actually use.  This move is premature and weak, and Black cna punish it any number of ways:

3...e5 is perfectly alright; 4 dxe5 Bxc5 and 4 e3 e4 (or 4...Bf5, 4...Nd7)

3...b6 4 b4 a5 and 5 a3 axb4 isn't what White wants.  4 cxb6 obviously isn't the idea, and 4 Qc2 bxc5 and ...e7-e5 is very nice for Black.