Chess Openings Lab
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Queen's Indian Defense: Capablanca Variation

The Capablanca Variation of the Queen's Indian is 5...Bb4+ after both sides fianchetto with g3 and ...Bb7. Black uses the check to make White commit a piece to d2, while White aims for Nc3 and pressure on the long diagonal.

Moves
1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+
ECO
E16
Engine
+0.32 · a slight edge for White (Stockfish 17.1, depth 20)
Played
156 games in our lichess sample
White scores
54.5%

Key ideas for both sides

White

  • Block with 6.Bd2 and then develop the knight to c3; a trade on d2 helps White develop fast.
  • Fight for the e4 square with Nc3 and Qb3, as in the main engine line after ...c6 and ...d5.
  • 6.Nbd2 keeps more pieces, followed by short castling, b3 and Bb2 to counter Black's ...c5.
  • The odd 6.Kf1 gives up castling but keeps the bishops, then Nc3 and cxd5 open the center.

Black

  • After 6.Bd2 retreat with ...Be7; the bishop did its job by drawing White's bishop to d2.
  • Build the triangle ...c6, ...d5 and ...e6 to blunt the g2 bishop's diagonal.
  • Against 6.Nbd2, castle and prepare ...c5 to challenge d4 before White plays b3 and Bb2.
  • The 6.Bd2 Bxd2+ line has a known pitfall called the Monticelli Trap, so check any ...Ne4 carefully.

Plans and pawn structure

The fight centers on the long diagonal and the e4 square. White's g2 bishop and Nc3 aim at e4 and Black's b7 bishop, while Black wants ...d5 and ...c6 to make that diagonal a wall. Once Black has the triangle on c6, d5 and e6, White often uses Qb3 and Rc1 to pressure the queenside. In the 6.Nbd2 lines, ...c5 and an early trade on d4 give Black open files for the rooks.

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 +0.32: a slight edge for White. Its three top choices for White:

  1. +0.32 6.Bd2 Be7 7.Nc3 c6 8.O-O d5
  2. +0.23 6.Nbd2 O-O 7.O-O Be7 8.b3 c5
  3. +0.10 6.Kf1 Be7 7.Nc3 d5 8.cxd5 Nxd5

Pawns, from White's side.

How it scores on lichess

156 rated lichess games reached this position; White scored 54.5%.

1600–199963.5%
2000 and up52.5%

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

Where it goes next

  • Monticelli Trap6.Bd2 · rare

How to play against it

As White, block with 6.Bd2 or 6.Nbd2 and avoid giving Black easy play on e4. If Black retreats ...Be7, take space with Nc3 and castle. As Black, after ...Be7 do not hurry to open the center; first finish the ...c6 and ...d5 setup and castle.

Other lines with this name

The lichess opening list also files these lines under the same name, though they reach a different position: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Nbd2 O-O 7.O-O; 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Nbd2 O-O 7.O-O d5; 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Nbd2 O-O 7.O-O a5.

Questions

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

The Queen's Indian Defense: Capablanca Variation starts 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+. Its ECO code is E16.

Is the Queen's Indian Defense: Capablanca Variation good for Black?

Stockfish 17.1 rates the position +0.32 at depth 20, which is a slight edge for White. A solid and practical line for Black players who like simple development, while White needs patience to use the extra space.

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

Black checks on b4 to make White put a piece on d2, which slightly disrupts White's harmony. Then both sides fight for e4, with Black often building a pawn triangle on c6, d5 and e6.

What should White play next?

The engine's first choice is Bd2, with Nbd2 and Kf1 close behind. 6.Bd2 blocks the check and offers a trade that helps White develop the queenside quickly.

Updated October 2026. Sources and method.