Chess Openings Lab
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Sicilian Defense: Accelerated Dragon, Exchange Variation

The Exchange Variation of the Accelerated Dragon is 5.Nxc6, where White trades knights at once before Black can play ...Nf6. Black chooses how to recapture: with the b-pawn for central control, or with the d-pawn for a queen trade, while White hopes for a structural edge.

Moves
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nxc6
ECO
B34
Engine
−0.10 · level (Stockfish 17.1, depth 20)
Played
1,869 games in our lichess sample
White scores
48.5%

Key ideas for both sides

White

  • Against ...bxc6, develop with Bc4, Nc3 and O-O, then use Re1 and e5 ideas to pressure Black's center.
  • Against ...dxc6, trade queens with Qxd8+ and use the king and bishop pair in the ending.
  • Watch for 5...Qb6, a blunder: Nd4 simply retreats and keeps the extra piece.
  • Keep the light-squared bishop on c4 to watch d5 and f7 after the pawn structure changes.

Black

  • 5...bxc6 is the engine's best: it adds a pawn to d5 and opens the b-file for your rook.
  • After ...bxc6, play ...Nf6, ...Bg7 and ...d5 to build a strong center.
  • 5...dxc6 leads to a queen trade; your king must move but the position is still playable.
  • Do not play 5...Qb6: the knight retreats to d4 and you are a piece down.

Plans and pawn structure

After ...bxc6, Black has a strong central pawn mass and can play ...d5. White aims to attack this center with e5 and c4 ideas, and uses the d-file and Bc4 to pressure d5. Black will use the b-file and the g7 bishop on the long diagonal. After ...dxc6, the game becomes a queenless middlegame where White's slight lead in development matters but Black's structure is sound.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position −0.10: level. Its three top choices for Black:

  1. −0.10 5...bxc6 6.Bc4 Nf6 7.Nc3 Qc7 8.O-O
  2. +0.42 5...dxc6 6.Qxd8+ Kxd8 7.Bc4 Ke8 8.a4
  3. +4.83 5...Qb6 6.Nd4 Nf6 7.Nc3 e5 8.Nb3

Pawns, from White's side.

How it scores on lichess

1,869 rated lichess games reached this position; White scored 48.5%.

under 120038.6%
1200–159945.3%
1600–199950.0%
2000 and up52.6%

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

How to play against it

With Black, recapture with 5...bxc6 and aim for ...d5, which gives you a broad center and an open b-file. Avoid 5...Qb6, which loses a piece after Nd4. With White, if you want a quiet game, this exchange gives you a clear structure to play against with Bc4 and Re1.

Questions

What are the moves of the Sicilian Defense: Accelerated Dragon, Exchange Variation?

The Sicilian Defense: Accelerated Dragon, Exchange Variation starts 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nxc6. Its ECO code is B34.

Is the Sicilian Defense: Accelerated Dragon, Exchange Variation good for White?

Stockfish 17.1 rates the position −0.10 at depth 20, which is level. In 1,869 lichess games from our sample, White scored 48.5%. A simple choice for White players who want to avoid theory, while Black is comfortable with the right recapture.

What is the main idea of the Sicilian Defense: Accelerated Dragon, Exchange Variation?

White exchanges knights to change the pawn structure. Black's best is ...bxc6, gaining central control and preparing ...d5, while ...dxc6 leads to an early queen trade.

What should Black play next?

The engine's first choice is bxc6, with dxc6 and Qb6 close behind. 5...bxc6 adds a pawn to the center and prepares ...d5 with a sound game.

Updated October 2026. Sources and method.