I specialize in the Queen's Gambit, here are some good games based on the sequence of:
1. d4 d5 2. c4 e6 3. c5
Here is data from some games in my database. It appears that black has an advantage if played correctly...
But here is some theory from research on a similar pawn structure and sequence....
"It's because they want black to commit to Nf6 first. The opening known as the Queen's Gambit Declined Exchange variation goes 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5. White then wants to play 5.Bg5 Be7 6.Qc2 c6 7.e3 Nbd7 8.Bd3 0-0 9.Nf3/Nge2 when black's light squared bishop isn't that great and white pieces are quite well placed for the famous queenside minority attack or central pawn push with f3/e4 in the middlegame. Black is still very solid though and has his chances (otherwise no one would play into this as black).
You can get the same pawn structure by playing 3.cxd5 exd5 which is perfectly fine but then after 4.Nc3 you can't force black to play Nf6. There are a lot of subtleties but long story short, because you can't put as much pressure on black with Bg5 and black hasn't spent a move on Nf6, he will be able to get his light squared bishop out to f5 without being punished. For example, 4.Nc3 c6! to shore up the d5 pawn before playing 5...Bf5; if ...Bf5 without ...c6, white would have Qb3 hitting b7 and d5.
The databases should have a higher score for white for 3.Nc3 compared to 3.cxd5 because stronger players will be booked up and play the former but below 1800 it really doesn't matter what opening you play.
It's not really "wrong" (at least White isn't worse after 3.cxd5), it's just "inaccurate." Black equalizes easily in the QGD Exchange if he can develop his bishop to f5 without problems. After 1.d4 d5 2.c4 e6 3.cxd5 exd5 4.Nc3 the most precise way to accomplish that is with 4...c6! followed by 5...Bf5. Compare a standard QGD Exchange move order like 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 Be7 6.e3 where 6...Bf5? runs into 7.Bxf6 Bxf6 8.Qb3 winning a pawn. In fact you could say that this tactic is the entire justification for White picking exactly this move order."
Let me know if it helps.
wow these games may really help me
and i have seen many people closing this position when i reject the pawn trade at e5(if whether they push ever the pawn to e5) then move to e6 so we have this move f3 which opens a file for the castled rook, we can even castle long side if the position is closed cause all of the queens side is blocked by pawns and the only entry is with knights.
I specialize in the Queen's Gambit, here are some good games based on the sequence of:
1. d4 d5 2. c4 e6 3. c5
Here is data from some games in my database. It appears that black has an advantage if played correctly...
But here is some theory from research on a similar pawn structure and sequence....
"It's because they want black to commit to Nf6 first. The opening known as the Queen's Gambit Declined Exchange variation goes 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5. White then wants to play 5.Bg5 Be7 6.Qc2 c6 7.e3 Nbd7 8.Bd3 0-0 9.Nf3/Nge2 when black's light squared bishop isn't that great and white pieces are quite well placed for the famous queenside minority attack or central pawn push with f3/e4 in the middlegame. Black is still very solid though and has his chances (otherwise no one would play into this as black).
You can get the same pawn structure by playing 3.cxd5 exd5 which is perfectly fine but then after 4.Nc3 you can't force black to play Nf6. There are a lot of subtleties but long story short, because you can't put as much pressure on black with Bg5 and black hasn't spent a move on Nf6, he will be able to get his light squared bishop out to f5 without being punished. For example, 4.Nc3 c6! to shore up the d5 pawn before playing 5...Bf5; if ...Bf5 without ...c6, white would have Qb3 hitting b7 and d5.
The databases should have a higher score for white for 3.Nc3 compared to 3.cxd5 because stronger players will be booked up and play the former but below 1800 it really doesn't matter what opening you play.
It's not really "wrong" (at least White isn't worse after 3.cxd5), it's just "inaccurate." Black equalizes easily in the QGD Exchange if he can develop his bishop to f5 without problems. After 1.d4 d5 2.c4 e6 3.cxd5 exd5 4.Nc3 the most precise way to accomplish that is with 4...c6! followed by 5...Bf5. Compare a standard QGD Exchange move order like 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 Be7 6.e3 where 6...Bf5? runs into 7.Bxf6 Bxf6 8.Qb3 winning a pawn. In fact you could say that this tactic is the entire justification for White picking exactly this move order."
Let me know if it helps.