Chess Openings Lab
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Queen's Indian Defense: Fianchetto Variation

The Fianchetto Variation of the Queen's Indian is 4.g3, preparing Bg2 to fight Black's queenside bishop on the long diagonal. Black chooses between ...Bb7, ...Ba6 against c4, or the solid ...c6 and ...d5 setup.

Moves
1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3
ECO
E15
Engine
+0.27 · level (Stockfish 17.1, depth 20)
Played
457 games in our lichess sample
White scores
56.3%

Key ideas for both sides

White

  • Play Bg2 and castle, then use Nc3 and the e4 square to fight Black's light-squared bishop.
  • Against ...c6 and ...d5, jump to e5 with the knight and support it with Nc3.
  • If Black checks on b4, block with Bd2 and recapture with the queen after the trade.
  • Look for the d5 push when Black's bishop goes to a6, gaining space and closing lines.

Black

  • The ...Bb7 reply is the classic answer, contesting e4 and the long diagonal from the first moment.
  • The ...Ba6 reply hits c4 at once and forces White to spend a move defending it.
  • Build ...c6 and ...d5 to make a pawn triangle that blunts the g2 bishop.
  • Trading bishops with ...Bb4+ and ...Bxd2+ eases Black's game and saves time.

Plans and pawn structure

The long diagonal is the main battlefield. White wants the g2 bishop to dominate and uses Nc3 and Ne5 to control e4 and d5. Black either opposes it with ...Bb7 or targets c4 with ...Ba6, forcing an awkward defense. With ...c6 and ...d5 Black gets a pawn triangle on c6, d5 and e6, which is solid but asks Black to find a plan with ...c5 or ...Nbd7 later. White usually castles short and plays on the queenside.

Where the engine's main line heads: Black's pawn triangle: c6, d5, e6. Black's triangle of pawns on c6, d5 and e6: very solid, but it can shut in the c8 bishop.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position +0.27: level. Its three top choices for Black:

  1. +0.27 4...c6 5.Bg2 d5 6.O-O Be7 7.Ne5
  2. +0.33 4...Bb4+ 5.Bd2 Bxd2+ 6.Qxd2 c6 7.Bg2
  3. +0.34 4...Be7 5.Bg2 O-O 6.d5 Ba6 7.Nh4

Pawns, from White's side.

How it scores on lichess

457 rated lichess games reached this position; White scored 56.3%.

1600–199954.2%
2000 and up57.7%

Light: White wins. Grey: draws. Dark: Black wins. About the sample.

Where it goes next

  • Capablanca Variation4...Bb7 · 156 games
  • Fianchetto Variation, Check Variation, Modern Line4...Ba6 · rare
  • Monticelli Trap4...Bb7 · rare

How to play against it

As Black, pick one setup and stay consistent. ...Bb7 leads to classical play, ...Ba6 creates tension around c4. Avoid moving the bishop twice without reason. If White pushes d5 early, be ready to take on d5 and use the open e-file against White's center.

Questions

What are the moves of the Queen's Indian Defense: Fianchetto Variation?

The Queen's Indian Defense: Fianchetto Variation starts 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3. Its ECO code is E15.

Is the Queen's Indian Defense: Fianchetto Variation good for White?

Stockfish 17.1 rates the position +0.27 at depth 20, which is level. In 457 lichess games from our sample, White scored 56.3%. A main line for White players who like slow, positional pressure, while Black needs a clear plan for the long diagonal.

What is the main idea of the Queen's Indian Defense: Fianchetto Variation?

White fianchettoes the f1 bishop to fight for the long diagonal and the e4 square. Black meets it with ...Bb7, ...Ba6 or a solid ...c6 and ...d5 triangle.

What should Black play next?

The engine's first choice is c6, with Bb4+ and Be7 close behind. 4...c6 prepares ...d5 to build a pawn wall that blunts the coming Bg2.

Updated October 2026. Sources and method.