Queen's Indian Defense: Petrosian Variation

Before the first move

The Queen's Indian Defense is a hypermodern classic where Black controls the center using pieces rather than pawns. In the Petrosian Variation, White plays an early a3 to prevent a pin on the c3-knight, aiming for a slow, solid squeeze while Black looks to strike from the flanks.

1. d4White

White plays d4, establishing a strong presence in the heart of the board. This is the most popular alternative to the King's Pawn Opening, often leading to more strategic and maneuvering battles rather than immediate tactical fireworks.

1... Nf6Black · your move

Develop your knight to f6. This flexible move prevents White from immediately playing e4 and keeps your options open. You are ready to react to White's setup while preparing your own kingside development.

Other paths here: Na6 (Australian Defense) · g5 (Borg Defense: Borg Gambit) · b6 (English Defense) · e5 (Englund Gambit)

2. c4White

White plays c4, challenging your control of the center and preparing to develop the queen's knight. While White could try the London System or the Trompowsky Attack, this move is the main line for players seeking a space advantage.

Other paths here: f4 (Canard Opening) · g4 (Indian Defense: Gibbins-Weidenhagen Gambit) · e4 (Indian Defense: Omega Gambit) · d5 (Indian Defense: Pawn Push Variation)

2... e6Black · your move

Slide your pawn to e6. This move supports the center and prepares to release your dark-squared bishop. It is a solid choice that keeps the tension high while staying very flexible for your next few moves.

Other paths here: g5 (Indian Defense: Medusa Gambit) · b5 (Indian Defense: Pyrenees Gambit) · a6 (Indian: 2.c4 a6) · Nc6 (Mexican Defense)

3. Nf3White

White plays Nf3, avoiding the Nimzo-Indian Defense by delaying the development of the c3-knight. White could also choose the Catalan with g3 or the Seirawan Attack with Bg5, but the knight move is the most classical and flexible approach.

Other paths here: g3 (Catalan Opening) · Qb3 (Indian Defense) · g4 (Indian Defense: Devin Gambit) · Bg5 (Indian Defense: Seirawan Attack)

3... b6Black · your move

Push your pawn to b6. This is the defining move of the Queen's Indian Defense. You are preparing to fianchetto your bishop to b7, where it will exert long-range pressure on the e4 and d5 squares.

Other paths here: d5 (Queen's Gambit Declined) · Ne4 (Indian Defense: Döry Indian) · a6 (Indian Defense: Dzindzi-Indian Defense) · Be7 (Neo-Indian: 3.Nf3 Be7)

4. a3White

White plays a3, the Petrosian Variation. This prophylactic move stops any annoying bishop checks on b4. You will see other setups like the Fianchetto Variation with g3 or the Kasparov Variation with Nc3, but a3 aims for a very controlled game.

Other paths here: Nc3 (Queen's Indian Defense: Kasparov Variation) · Bf4 (Queen's Indian Defense: Miles Variation) · Bg5 (Queen's Indian: 4.Bg5) · e3 (Queen's Indian Defense: Spassky System)

Where you stand

The position is strategically rich. White will likely continue with Nc3 and e4 to seize the center, while Black will fianchetto the bishop on b7 and challenge White's central pawns with d5 or c5. The battle revolves around whether White's extra space outweighs Black's harmonious piece coordination.

• c8-b7 Fianchetto the bishop to control e4
• b1-c3 Develop the knight to support e4
• d7-d5 Strike at the center with d5
• e2-e4 Expand in the center with e4