About this opening
You have the full center and Black is preparing to attack it from a distance rather than occupy it. Nf6 is the most played reply here, hitting your pawn and asking you to defend it. g6 goes straight for the fianchetto. The strategic question is simple and it repeats for the next fifteen moves: your center is an asset while it holds and a liability the moment it cracks, so every advance needs a piece behind it. Black is waiting for exactly one careless push. Build with Nc3 and Be3, decide which wing to castle on, and only then advance.
Plans
- Defend the center with Nc3 before pushing anything.
- Develop Be3 and Qd2 with a view to castling long.
- Push f4 and e5 only once pieces support the advance.
- Trade off the bishop on g7 if you can manage it safely.
Where the pieces belong
- Knight: c3, the first defender of the center
- Bishop: e3, holding d4 against the bishop on g7
- Queen: d2, connecting the rooks and eyeing the dark squares
- Pawn: f4, space and the base of a kingside advance
- King: castled long in the sharpest lines
Your space against Black's flexibility. Castling on opposite wings turns it into a pawn-storm race, and holding the center is what keeps you a move ahead in it.