Chess Openings Lab
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Caro-Kann Defense: Breyer Variation

The Breyer Variation is 2.d3, a quiet answer to the Caro-Kann that supports e4 with a pawn instead of fighting for d4. White heads for a King's Indian Attack style setup, while Black is free to grab the center with ...d5 and often ...e5.

Moves
1.e4 c6 2.d3
ECO
B10
Engine
+0.12 · level (Stockfish 17.1, depth 20)
Played
4,765 games in our lichess sample
White scores
49.9%

Key ideas for both sides

White

  • Build with Nf3, Nbd2, g3, the bishop to g2 and short castling, keeping e4 solid behind the d3 pawn.
  • Push e5 if Black's pieces allow it, gaining space on the kingside for a later f4 or h4 attack.
  • The engine line shows White can still play d4 later, so the d3 move is flexible rather than final.

Black

  • Take the center with ...d5, the engine's top choice, and consider ...e5 next to build a full pawn center.
  • A fianchetto with ...g6 and ...Bg7 works well, as in the first engine line, aiming at White's center from afar.
  • Develop the light bishop to g4 before playing ...e6, so it is not shut in behind the pawns.
  • Keep the option of ...dxe4 to open the d-file if White delays castling.

Plans and pawn structure

Because White's d-pawn stops on d3, Black gets an easy share of the center. A common setup is ...d5, ...e5, ...Nf6 and ...Bd6, with Black holding more space. White usually plays for a closed fight: Nbd2, g3, a bishop on g2, short castling and a rook to e1, then a timely e5 or a queenside push with c3 and b4. If Black plays ...dxe4 dxe4, the d-file opens and an early queen trade can follow, giving a calm, level game.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position +0.12: level. Its three top choices for Black:

  1. +0.12 2...d5 3.Nf3 g6 4.Nbd2 Bg7 5.d4
  2. +0.19 2...e5 3.d4 d6 4.Nf3 Nf6 5.dxe5
  3. +0.19 2...d6 3.Nc3 Nf6 4.f4 c5 5.Nf3

Pawns, from White's side.

How it scores on lichess

4,765 rated lichess games reached this position; White scored 49.9%.

under 120046.2%
1200–159948.8%
1600–199950.4%
2000 and up53.2%

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

Where it goes next

  • Breyer Variation, Stein Attack2...d5 · rare

How to play against it

As Black, take your share of the center with ...d5 and develop with ...Nf6 and ...g6 or ...Bg4. Do not rush ...dxe4 unless it gains something, because opening the d-file helps White's setup as much as yours. Keep an eye on e5: if White pushes it, have ...Nfd7 and a pawn break ready.

Questions

What are the moves of the Caro-Kann Defense: Breyer Variation?

The Caro-Kann Defense: Breyer Variation starts 1.e4 c6 2.d3. Its ECO code is B10.

Is the Caro-Kann Defense: Breyer Variation good for White?

Stockfish 17.1 rates the position +0.12 at depth 20, which is level. In 4,765 lichess games from our sample, White scored 49.9%. A low-theory system for White players who like slow, closed positions; Black has no problems if they claim the center and develop normally.

What is the main idea of the Caro-Kann Defense: Breyer Variation?

White avoids the main Caro-Kann theory by playing 2.d3 and aiming for a King's Indian Attack setup. Black gets free central play with ...d5 and can choose a fianchetto or an ...e5 center.

What should Black play next?

The engine's first choice is d5, with e5 and d6 close behind. 2...d5 claims the center at once and leads to the Stein Attack setups.

Updated October 2026. Sources and method.