Like Kylemeister, I'd caution against getting too ambitious as Black after 1.Nf3 d5 2.g3 Nc6 3.Bg2 e5 4.d3.  A tempo is worth something in chess, after all.  

2...Nc6!? is interesting, but I'd be most concerned with 3.d4, which is clearly the most natural move.  I wouldn't at all assume that a White player who begins with 1.Nf3 d5 2.g3 is necessarily looking for a King's Indian Attack against everything; that's a very flexible move order that could allow a Reti, Catalan, etc.  

Anyhow after 2...Nc6 3.d4, my gut feeling is that 3...Nf6 is at least somewhat dubious.  I'm not sure which of 3...Bg4 or 3...Bf5 Black should prefer offhand, though I notice that 3...Bf5 4.Bg2 Nb4!? is an interesting idea that's been played by some strong players.  I'd probably investigate that.

I first became aware of the King's Indian Attack out of the French defense, 1e4 e6 2d3 d5 3Nbd2. However, the line is analyzed under ECO A08. Here is a pretty main line:

1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 4. O-O Be7 5. d3 O-O 6. Nbd2 c5 7. e4 Nc6 8. Re1 b5 9. e5!? Nd7 10. Nf1.

Many games have been played from this position. Black plays on the queen side and white on the king side:  10...a5 11h4 b4, etc. Certainly a line to debate! However I was surprised to see that black has fared pretty well in a few games with 10...f6. 10...f6!? greatly changes the character of the game. What do you think? Has this been addressed in literature? Does anyone have experience with this line? 

RdC wrote on 08/05/14 at 16:56:19:


Offhand I would think it might be critical to aim for a reversed version of an old idea (I recall it from Keene and Botterill) of after 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 6. dc Qa5 7. Bd3 Qxc5 8. Qe2 meeting Be3 with ...Qb4.

RdC wrote on 08/05/14 at 10:58:09:


Might not be the best idea to play, say, a reversed Austrian ...

yolocounty wrote on 08/04/14 at 22:41:47:


True, this is also an annoying system to play against.

As a novice KIA player i don't like these systems:

• 1.Nf3 d5 2.g3 g6 because it doesn't connect well with my anti-grunfeld system (1.Nf3 Nf6 2.c4 g6 3.Nc3 d5 4.Qa4+)
• 1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 because i feel like White doesn't have a clear target if Black doesn't play c5 or brings the white bishop out (so i usually switch to a catalan with 4.d4 instead of 4.d3)

So if you think you can have winning chanches in the black side of the closed catalan go for it, but i suggest you to aim to a murky grunfeld setup.

I was wondering, after 1.Nf3 d5 2.g3, what do you think is the easiest way for Black to equalise while still keeping decent winning chances? I realise it's a very general question and in many ways a matter of taste, but an idea of what is most unpleasant for KIA advocates to face would be really helpful.