Caro-Kann: Advance, 4.Nf3 e6 5.Be2 Nd7: what should White play?

In the Caro-Kann Defense Advance Variation after 5...Nd7, White's most practical and principled choice is O-O, which secures king safety and preserves an engine evaluation of +0.48. Alternatively, Nbd2 offers a flexible approach to development evaluated at +0.41, preparing central support before committing the king. Both continuations maintain White's spatial advantage stemming from the advanced pawn on e5.

Castling and Main Continuations

The vast majority of players select O-O, which appears in 90.5% of the recorded games (358K recorded) and scores 54.2% for White. Getting the king off e1 prepares White to mobilize the central pawns and coordinate the rooks effectively. An illustrative engine continuation demonstrates this approach with O-O a6 Nbd2 Bg6 c4 h6, where White immediately shifts focus toward expanding in the center with the c4 break.

The Flexible Development of Nbd2

Chosen in 3.6% of games (14K recorded), Nbd2 scores 52.6% for White and develops the queenside knight without deciding king placement immediately. It directly prepares central counterplay against Black's anticipated breaks against the pawn chain. The engine's preferred sequence runs Nbd2 c5 O-O Ne7 c4 Nc6, showing a dynamic battle over the d4 and d5 squares as both sides contest central territory.

Minor Alternatives

White occasionally tests other setups, such as c3, which reinforces the pawn center and is played in 4.5% of games (18K recorded) with an evaluation of +0.35 and a 50.3% score. Less frequently, White tries h3, seen in 1.4% of games (5.6K recorded) with an evaluation of +0.26 and a 48.1% score, or a4 (+0.31), though none match the broad popularity or statistical success of the primary king-safety and developmental choices.