Queen's Indian Defense

The Queen's Indian (1.d4 Nf6 2.c4 e6 3.Nf3 b6) is the Nimzo's quiet sibling. If White plays 3.Nf3 instead of 3.Nc3, Black can't pin the knight - so they fianchetto the light-squared bishop instead, aiming it at the long diagonal e4 to a8. The result is a slow, strategic, control-the-centre opening with a strong reputation: Kasparov, Karpov and Carlsen have all used it.

Main line: Classical (4.g3)

White's standard response is to fianchetto too, blunting Black's bishop on b7 with their own bishop on g2. After 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Ne4 (a typical Nimzo-style idea), play becomes a quiet manoeuvring battle. Both sides are equally well-placed; the question is who's better at squeezing tiny advantages from a balanced position.

Variations

Petrosian (4.a3)

Named after world champion Tigran Petrosian. White preempts a future ...Bb4+ check. The a3 move is mysterious-looking on move four but it has bite: it lets White play Nc3 without worrying about ...Bb4, and prepares b4 to grab queenside space. Black usually responds with ...Bb7, ...d5, ...Be7, accepting that the game will be slow.

Kasparov (4.Nc3)

White invites Black to transpose into a Nimzo-Indian with 4...Bb4. If Black sticks with Queen's Indian style (4...Bb7), White can play 5.a3, the Kasparov Variation - which threatens to grab a huge centre with e4. Black has to respond accurately with 5...d5 or 5...Bxc3 bxc3.

Nimzowitsch (4.e3)

Calm and flexible. White plays e3 supporting d4 and preparing Bd3, with no committal move yet. Often transposes into Catalan or QGD structures depending on what Black does. The least theoretical White option - good for players who want to skip the deep main lines.

Common traps

Don't let ...Ne4 land for free: in many Classical lines, Black plays ...Ne4 hitting the c3 knight and threatening ...Nxc3 or ...f5 supporting the outpost. If White's pieces are tangled, ...Ne4 can be very strong. The standard response is Nxe4 Bxe4 then either f3 to kick the bishop, or Bd2 with Nd2 to challenge the bishop's diagonal.

Be careful about the queenside: in Petrosian and Kasparov lines, if Black isn't proactive, White's b4 followed by Bb2 and possibly d5 can squeeze Black's queenside flat. Always have a counter-break planned - usually ...c5 or ...d5 at the right moment.

Typical plans for Black

The strategic core is the b7-bishop. Every Black plan revolves around making that bishop count - controlling e4, attacking pieces on the long diagonal, or trading it for a knight if it gets blunted. Common breaks include ...d5 (challenging the centre), ...c5 (queenside pressure), and ...f5 (kingside expansion). The Queen's Indian player wins by being slightly more patient than White.

If you play the Nimzo against 3.Nc3 and want a matching weapon against 3.Nf3, the Queen's Indian is the natural pair. The drills below cover the main g3 fianchetto and the Petrosian a3.