Caro-Kann Defense: what to play after Nf3?

In the Caro-Kann Defense (ECO A04), Black's overwhelmingly standard response is d5, which directly stakes a claim in the center and fulfills the strategic purpose of the opening. Engine evaluation rates d5 at +0.25, making it the most theoretically sound choice by a considerable margin. This advance challenges White's pawn on e4 immediately, allowing Black to contest central space without conceding unnecessary initiative.

Theoretical Dominance of d5

The move d5 accounts for 94.9% of all database entries from this position, spanning 84M recorded games. White scores 48.1% against this choice, reflecting Black's reliable solidity in the center. An illustrative engine continuation runs d5 Nc3 Bg4 d4 Nf6 Bd3, where Black readily develops minor pieces to active squares while keeping structural integrity.

Deviations and Secondary Moves

Alternative options exist but appear far less frequently in opening practice. The most common sideline is d6, chosen in 3.9% of games (3.46M recorded), which evaluates at +0.77 and yields a 49.4% score for White. A sample continuation is d6 c4 Nf6 Nc3 Qa5 Qc2. Other playable continuations include g6 (0.9% of games, eval +0.63, White scoring 50.0%) and the early queen excursion Qa5 (0.2% of games, eval +0.63, White scoring 53.3%).

Flank Alternatives

The waiting move a6 has occurred in 0.2% of games (162K recorded), carrying an engine evaluation of +0.49 with White scoring 50.4%. An illustrative sequence is a6 d4 d5 Nc3 dxe4 Nxe4, where Black ultimately steers play back toward traditional central structures after an initial delay. While sidelines remain playable, none match the central presence and theoretical standing of the primary strike d5.