French Defense: Advance Variation: what to play after c5?

In the French Defense: Advance Variation (ECO C02), White's primary and most principled choice is c3, which reinforces the center and maintains the d4 pawn against immediate counterpressure. This standard continuation secures the highest engine evaluation (+0.27) among the options and represents the absolute cornerstone of White's opening strategy. Across the recorded database of over 3.14 million games, c3 dominates opening practice, scoring 48.4% points for White across 26M recorded games (840.7% relative popularity in the database).

Strategic rationale for c3

The move c3 solidifies White's central space advantage by reinforcing the pawn chain at d4 and e5. Because Black aims to undermine White's spatial wedge by attacking the base of the chain on d4, bolstering this square with a pawn ensures that any eventual central exchanges allow White to recapture with a pawn rather than a piece. An illustrative engine continuation demonstrates this typical unfolding: c3 Nc6 Nf3 Bd7 Be2 Nge7, where White quietly develops the kingside while maintaining the established spatial advantage.

Primary alternatives

While c3 remains the theoretical benchmark, several alternatives appear in the database. The most common sideline is Nf3, featured in 7.77M recorded games (247.5% relative popularity) with an engine evaluation of -0.06 and a 45.2% score; an illustrative path runs Nf3 cxd4 Nxd4 Ne7 Bd3 Nbc6. Less frequent tries include the check Bb5+ (1.16M recorded games, 36.9% popularity, scoring 44.3%, eval -0.35), Bd3 (107K recorded games, 3.4% popularity, scoring 48.8%, eval -0.25), and Nd2 (eval -0.41), though none match the structural soundness of c3.