MNb wrote on 03/07/09 at 21:12:47:
TN wrote on 03/07/09 at 11:44:34:
My personal view is that 3.Nc3 is a slightly better choice than 3.g3, for the following reasons:
1) It is easier for White to handle 3.Nc3 g6 than 3.g3 g6 if he does not have the Fianchetto KID or Fianchetto Benoni in his White repertoire.
White simply can avoid the Fianchetto Benoni by refusing to play d4-d5 and then it does not matter if he plays 3.Nc3 or 3.g3 first: 1.c4 c5 2.Nf3 Nf6 3.g3 g6 4.Bg2 Bg7 5.0-0 0-0 6.Nc3 Nc6 7.d4
a) 7...cxd4 8.Nxd4 is thought to be a little better for White.
b) 7...d6 is one variation of the Fianchetto KID (Jugoslav? Panno? something like that).
So argument 1) is not very strong.
Perhaps, although 3.Nc3 has the advantage of being able to meet 3...g6 with either 4.g3 leading to one of your given lines (probably the best choice for someone who usually plays 1.d4) or 4.d4, leading to a Maroczy Bind (probably the best choice for someone who usually plays 1.e4).
Since Michael would prefer to avoid the transposition to the Fianchetto KID, I would recommend 4.d4, as stated earlier. If 4...Bg7, then 5.d5 will lead to a Benoni - if White has the Benoni with Nf3 in his repertoire, then this should be a favourable transition for him.
@Michael Ayton
Thanks for the reference to Morozevich-Lutz - I had already seen the game but had forgotten about Morozevich's 9.Ng5 idea. However, instead of 9...Nfd7, 9...h6 is supposed to equalise for Black.
Edit: After 1.Nf3 Nf6 2.c4 c5 3.Nc3 g6 4.d4 cd4 5.Nd4 Bg7 the reason I prefer 6.Nc2 to 6.e4 is to avoid the Gurgenidze Variation with 6...Nd4 7.Qd4 d6, mainly out of personal preference rather than considering one to be superior to the other.