1.Nf3 White chooses the least committal path to the KIA.
1...Nf6 Black plays it close to the vest.
2.g3 d5 White continues the standard kingside development. Black still has plenty of options.
3.Bg2 g6 Black chooses a symmetrical formation, bomb-proofing his kingside.
4.0-0 Bg7 5.d3 Ready to start supporting e4.
5...0-0 6.Nbd2 White has reached the basic KIA position.
6...Nc6 Blocking the c-pawn and playing for a quick ...e5.
7.e4 dxe4 8.dxe4 The d2-knight shields the queen.
8...e5 White is still a move ahead, planning Nc4 to pressure e5.
9.c3 First white keeps black out of d4.
9...Qe7 Clearing d8 for the rook and supporting e5.
10.Re1 White supports e4 to free his d2-knight to play to c4.
10...b6 Opening b7 and a6 for the bishop.
11.a4 White secures c4 for his knight and flirts with b4.
11...a5 Stabilizing the queenside.
12.Nc4 Finally white occupies the key square.
12...Rd8 Black develops his rook and hits white's queen.
13.Qb3 Making sure black can't dislodge the key c4-knight.
13...Ba6 The bishop pressures the c4-knight and occupies an open diagonal.
14.Qa2 Unblocking the b-pawn, but maintaining control of the a2-g8 diagonal.
14...h6 Preventing the unpleasant pin after Bg5.
15.Ne3 Aiming at d5.
15...Qc5?! Black's king is vulnerable. [15...Qf8 This seems better. 16.Nd5 Ne8 Black is holding on.]
16.Nh4 Threatening g6 - note the pin on f7.
16...Bd3 Black bites on the e4-pawn.
17.Nxg6 Bxe4 18.Bxe4 Nxe4 19.Nh4 Black's kingside pawns are weak.
19...Ng5 20.Qc4 With the kingside open, white forces an exchange of queens leaving himself with an endgame advantage. If black avoids the trade, white can swing his queen over to participate in a kingside attack.
20...Qxc4 21.Nxc4 Rd3 Planning to take advantage of white's undeveloped bishop by doubling rooks.
22.Bxg5 Developing with tempo...
22...hxg5 23.Nf5+/- ...and dropping the knight in on a beautiful square. White has a significant advantage; black has a bad bishop, obstructed by its own pawns.