In many setups where black plays g6 Bg7 I enjoy playing f3 Be3 Qd2 and looking to either play Bh6 or storm my g&h pawns. I like f3 because I don't have to worry about any knight attacks on my bishop (I realize I don't always have to worry about the knight attack but often I find myself spending too much time and not knowing what to do if black plays that way). Here is the line where I play f3 and I believe it is solid:
[fen ""] [Startply "13"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. f3 Bg7 7. Be3
My question is why is f3 not as strong when Nc6 is played rather than d6.
Is there a clear conceptual reason why f3 is not as strong (compared to the line above) in the following line:
[fen ""] [Startply "15"] 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Be3 Bg7 6. Nc3 Nf6 7. f3?
I usually play both lines because I understand the ideas. Another questions, do you have any advice on where I can improve in this Nc6 line? If you suggest something else please explain the idea. I realize there is probably nothing horribly wrong with f3 against Nc6 but it doesn't appear to be as consistent as against d6, but I can't see a reason why. It looks like the main moves are 7. Bc4, 7. Be2, 7. Nxc6, 7. Nb3.