Chess Openings Lab
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French Defense: Advance Variation, Nimzowitsch System

The Nimzowitsch System is 3...c5 4.Nf3 in the Advance French, where White develops the knight before playing c3. White is ready to give up d4 for quick development, while Black can take with 4...cxd4 or transpose with 4...Nc6 and 5.c3.

Moves
1.e4 e6 2.d4 d5 3.e5 c5 4.Nf3
ECO
C02
Engine
−0.15 · level (Stockfish 17.1, depth 20)
Played
7,577 games in our lichess sample
White scores
45.5%

Key ideas for both sides

White

  • If Black takes on d4, develop with 5.Bd3, O-O and Re1 instead of rushing to recapture; e5 and the lead in development are the payment.
  • Against 4...Nc6, 5.c3 returns to normal Advance French structures with the full d4-e5 chain.
  • Nbd2 and Nb3 can win the d4 pawn back later, once the kingside is safe.

Black

  • 4...cxd4 is the engine's top move: Black takes a pawn and develops with ...Nc6 and ...Nge7.
  • Aim the e7-knight at g6 to attack e5; after Re1, ...Ng6 still adds pressure.
  • 4...Nc6 or 4...Bd7 keeps things standard; after 5.c3 Black reaches the usual chain structures.

Plans and pawn structure

If Black grabs on d4, the chain loses its base, and the e5 pawn becomes the target of ...Ng6, ...Qc7 and ...f6. White uses the time to castle, put a rook on e1 and win d4 back with Nb3 or Nxd4 when it is safe. If White regains the pawn with pieces active, the game is level. If not, Black is simply a healthy pawn up.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position −0.15: level. Its three top choices for Black:

  1. −0.15 4...cxd4 5.Bd3 Nc6 6.O-O Nge7 7.Re1
  2. +0.20 4...Nc6 5.c3 Bd7 6.Be2 cxd4 7.cxd4
  3. +0.26 4...Bd7 5.c3 Nc6 6.Be2 Nge7 7.Na3

Pawns, from White's side.

How it scores on lichess

7,577 rated lichess games reached this position; White scored 45.5%.

under 120045.3%
1200–159945.9%
1600–199944.5%
2000 and up50.6%

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

Where it goes next

  • Advance Variation, Ruisdonk Gambit4...cxd4 · rare

How to play against it

Take on d4 with 4...cxd4; White's c-pawn is still on c2, so nothing recaptures right away. Then develop with ...Nc6, ...Nge7 and ...Ng6, and keep ...f6 in mind to hit e5. Avoid opening the position before you have castled, since Re1 and Bd3 aim straight at your king.

Questions

What are the moves of the French Defense: Advance Variation, Nimzowitsch System?

The French Defense: Advance Variation, Nimzowitsch System starts 1.e4 e6 2.d4 d5 3.e5 c5 4.Nf3. Its ECO code is C02.

Is the French Defense: Advance Variation, Nimzowitsch System good for White?

Stockfish 17.1 rates the position −0.15 at depth 20, which is level. In 7,577 lichess games from our sample, White scored 45.5%. A gambit-flavored option for White players who like quick development; Black takes the pawn and keeps the more comfortable game.

What is the main idea of the French Defense: Advance Variation, Nimzowitsch System?

White develops the king's knight and is willing to lose the d4 pawn for time. Black's best answer is to take on d4 and attack the e5 pawn with ...Nge7-g6.

What should Black play next?

The engine's first choice is cxd4, with Nc6 and Bd7 close behind. 4...cxd4 takes the pawn while White's c-pawn can't recapture, and ...Nc6 and ...Nge7 follow.

Updated October 2026. Sources and method.