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taoistlunatic ♡ 63 ( +1 | -1 )
IQP in queen's gambit Why does white willingly accept an isolated queen's pawn on black's open file, in many opening variations of the queen's gambit?

I can't figure out why white doesn't avoid it.

For example here in the Queen's gambit declined, semi-tarrasch defense
1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bc4 cxd4 8.exd4
or another variation of the same opening

7.Bd3 cxd4 8.exd4

This is just one example of theoretical opening lines which accept an IQP on the enemy's open file.

Is the pawn offering some dynamic control of the board? Or is it difficult to attack? Is white just avoiding something even worse positionally?
philaretus ♡ 36 ( +1 | -1 )
taoistlunatic White accepts the isolated pawn because he can avoid it only by inferior lines of play. His principal compensation is fairly obvious: Black has still not freed his position. In order to do that Black will have to play e5 in due course, dissolving White's isolated pawn. Meanwhile, White enjoys free play with his pieces.
taoistlunatic ♡ 15 ( +1 | -1 )
thanks philaretus. I basicaly thought so, but why are the other lines of play inferior? I guess they allow black to free his position, nevermind, answered my own question... :)
atrifix ♡ 27 ( +1 | -1 )
The IQP is a static weakness, but it is also a dynamic strength. Simply having an IQP is not necessarily a weakness, and in many cases it leads to a kingside attack supported by an outpost on e5 or similar themes. At any rate, in modern practice it is perfectly acceptable to assume an IQP, depending upon the position.
zdrak ♡ 61 ( +1 | -1 )
here's an example How the outpost at e5 can play a part in a white kingside attack. Note that black never got the chance to attack the isolated d4 pawn.

This one comes from a classic game Botvinnik-Vidmar, 1936

1. c4 e6
2. Nf3 d5
3. d4 Nf6
4. Bg5 Be7
5. Nc3 O-O
6. e3 Nbd7
7. Bd3 c5
8. O-O cxd4
9. exd4 dxc4
10. Bxc4 Nb6
11. Bb3 Bd7
12. Qd3 Nbd5
13. Ne5 Bc6
14. Rad1 Nb4
15. Qh3 Bd5
16. Nxd5 Nbxd5
17. f4 Rc8
18. f5 exf5
19. Rxf5 Qd6
20. Nxf7 Rxf7
21. Bxf6 Bxf6
22. Rxd5 Qc6
23. Rd6 Qe8
24. Rd7 black resigned

Of course this one example shouldn't drive you to the other extreme and convince you that "all IQP positions are good for white" - but rather show you the dinamic chances white gets in return for the static weakness.