Michael Ayton wrote on 07/28/09 at 09:50:26:Very interesting thread. I'm curious why Yusupov's c2--c4 Colle isn't seen more (after ...d5/...e6), seeing that quite e few modern sources think highly of it.
Standard C-Z is also very interesting, but I'd like to ask what any of you who play it may have against the equalising line of Cabrilo--Kovacevic (8 ... Qe7 9 Ne5 cd 10 ed Qc7). Or do you deviate earlier?
After 1.d4 Nf6 2.Nf3 e6 3.e3 d5 4.Bd3 c5 5.b3 Nc6 6.0-0 Bd6 7.Bb2 0-0 8.Nbd2 Qe7
Both Susan Polgar's and Aaron Sumerscale's DVDs don't deal with Black's threat of ... Qc7. Nigel Davies' DVD does. He says that after Black plays his Q to e7 White should consider playing c2-c4, heading for a hanging pawn position. The reason being Black's Q is not putting pressure on White's weak hanging pawns and will have to relocate, thus losing time.
Also Davies says that if Black plays ... Nbd7 instead of ... Nc6, again White should seriously consider c2-c4 for a similar reason as with the Q on e7. The N on d7 doesn't put pressure on White's hanging pawns and is mis-placed.
This seems to be the way Yusupov plays this opening. Knowing the pawn structures and remaining flexible. If Black gives him the Colle-Z bind with a N on e5 supported by pawns on d4 and f4, great. If Black tries to stop this by playing his Q to e7, then he switches to c2-c4.
One more thing, David Rudel has a very good article on the ... Qe7-c7 manuever at Chessvile. It's something like 10 pages long and it's free. He explains White's problem well.
Here's what GM Davies says about the Colle-Zukertort on his DVD.
"A very respectable opening, and yet it hasn't caught the attention of many of the world's elite." ... "I think it's a really excellent opening."