French Defense: Rubinstein Variation, Blackburne Defense
The Blackburne Defense is 4...Nd7 in the Rubinstein French, preparing ...Ngf6 so that any trade on f6 is met by a knight. White keeps a small space edge with Nf3 or Bd3, while Black frees the game with ...c5.
- Moves
- 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7
- ECO
- C10
- Engine
- +0.45 · a slight edge for White (Stockfish 17.1, depth 20)
- Played
- 1,712 games in our lichess sample
- White scores
- 48.8%
Key ideas for both sides
White
- 5.Nf3 is the engine's choice; after ...Ngf6 trade on f6 and develop with Bd3 and Be3.
- Meet ...c5 with Be3, protecting d4 and preparing a queen move and long castling.
- A knight on e5, as in the third engine line, is a strong outpost after c3 and Nf3.
- Avoid trading on f6 too early if Black has not yet committed to ...c5.
Black
- Play ...Ngf6 next. After the trade on f6, the d7 knight recaptures and keeps the pawn structure intact.
- Strike with ...c5 to challenge d4 before White completes development and castles.
- Bring the queen to c7, as in the engine lines, to cover e5 and eye h2.
- Develop the c8 bishop with ...b6 and a fianchetto on b7 to fight for the long a8-h1 diagonal.
Plans and pawn structure
The trade on f6 is the first decision. After Nxf6+ Nxf6, White plays Bd3, Be3 and Qe2, often castling long, while Black hits d4 with ...c5 and develops with ...Qc7 and ...Be7. White's space and the e5 outpost give a small edge; Black's ...c5 break and quick development keep the game balanced. The d4 pawn is the key target for both sides.
Where the engine's main line heads: White pawn d4, no e-pawns for White, no d-pawn for Black. White has a pawn on d4 and no e-pawn; Black has no d-pawn. White has more central space; Black's pieces are free and the d4 pawn is a target.
What the engine plays from here
Stockfish 17.1 at depth 20 rates the position +0.45: a slight edge for White. Its three top choices for White:
- +0.45 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.Bd3 c5
- +0.44 5.Bd3 c5 6.Nf3 Ngf6 7.Nxf6+ Nxf6
- +0.43 5.c3 Ngf6 6.Nxf6+ Nxf6 7.Nf3 a6
Pawns, from White's side.
How it scores on lichess
1,712 rated lichess games reached this position; White scored 48.8%.
Light: White wins. Grey: draws. Dark: Black wins. About the sample.
Where it goes next
- Rubinstein Variation, Capablanca Line5.Nf3 · rare
How to play against it
As White, play 5.Nf3 and trade on f6 after ...Ngf6, then develop with Bd3 and Be3. Do not rush the attack; Black's ...c5 is coming and you need d4 protected first. Knights on e5 and long castling give you the best chances.
Questions
What are the moves of the French Defense: Rubinstein Variation, Blackburne Defense?
The French Defense: Rubinstein Variation, Blackburne Defense starts 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7. Its ECO code is C10.
Is the French Defense: Rubinstein Variation, Blackburne Defense good for Black?
Stockfish 17.1 rates the position +0.45 at depth 20, which is a slight edge for White. In 1,712 lichess games from our sample, White scored 48.8%. A solid, reliable choice for Black players who like simple structures and know the ...c5 break.
What is the main idea of the French Defense: Rubinstein Variation, Blackburne Defense?
Black plays ...Nd7 so that ...Ngf6 can challenge the e4 knight without accepting doubled pawns. Then ...c5 frees the game.
What should White play next?
The engine's first choice is Nf3, with Bd3 and c3 close behind. 5.Nf3 develops naturally and covers e5, keeping White's options flexible.
Related lines
Updated October 2026. Sources and method.