I've been playing some KIA recently, but of course it never goes like the books say it should. By far the most common line I face (well over half my games) is 1.Nf3 d5 2.g3 Nc6. This is barely mentioned in KIA books. Statistically, white scores exceptionally well in this position if he postpones Bg2 and stakes his claim in the center with 3.d4. This makes sense to me, but I'm not sure where to look for this opening. I've seen it called a reversed Grunfeld or some type of Catalan variation. Anyway, I'd like to figure out what white is striving for in this position after playing 3.d4, but I'm not sure where to hunt for the info. Any ideas?