Caro-Kann Defense: Two Knights Attack with Bg4 – A Complete Guide for White

After 4.d4, you control the centre with pawns on d4 and e4, plus knights on c3 and f3 that can leap forward at any moment. Black's bishop on g4 is annoying — it pins your f3-knight to the queen — but it's also a target. Your main goals here are simple: develop your kingside, break the pin favourably, and keep your central pawns from being undermined. The engine's +0.36 reflects that your space advantage and development potential outweigh the pin. The most common Black reply, 4...e6 (played in 78,557 games), solidifies their d5-pawn and opens a diagonal for their light-squared bishop, but it also gives you time to play Be2 next, unpinning your knight naturally. Your plan then: Be2, castle, and decide whether to recapture on e4 or push forward.

Stockfish's best continuation is 4...e6 5.Be2 dxe4 6.Nxe4. After you play 5.Be2, Black often takes on e4, and you recapture with your knight — not the pawn. Why the knight? Because Nxe4 brings your piece into the centre, threatens to move your queen out of the pin, and prepares Nxf6+ (checking the king after ...Bg4 is gone) or simply Nc3-d2-f1 if needed. In this line your position remains harmonious: you'll castle next, Black still needs to develop their kingside, and you keep the small plus. The 4...e6 line is Black's most popular choice, but White's scoring is only 46.2% here — that's below the overall 47.7%, which tells you many White players don't follow up accurately. Your job is to be the one who does.

Black can also take the pawn at once with 4...dxe4 (32,237 games, White scores 49.7% — your best winning percentage among the top three replies). After 5.Nxe4, Black's bishop on g4 still pins your knight, but now you have a very dangerous threat: 6.Nxf6+ gxf6 (or exf6) would wreck Black's pawn structure. In practice, Black usually retreats the bishop first, often with 5...Bg6 or 5...Bxf3. If 5...Bxf3, you recapture 6.Qxf3, and suddenly your queen is active, you're a tempo up on development, and Black's bishop pair is gone. This is a line where you want to know your moves — the engine says staying calm and developing is key, and your scoring jumps to nearly 50% when you do.

Two Black moves that appear often are actually subpar. First, 4...Nd7 (3,452 games) is a full mistake costing Black about 1.4 pawns. It's a passive move that blocks the light-squared bishop and does nothing to challenge the centre. The computer says Black should have played 4...Nf6 instead. Second, 4...Qa5 (2,006 games) is an inaccuracy losing about 0.8 pawns. That queen sortie looks active, but it's premature: the queen can become a target, and Black hasn't developed any pieces. After 4...Qa5, you can simply play 5.Bd2 or 5.dxc5 or develop naturally — your score is a healthy 52.2%. If your opponent plays either of these moves, trust your development, keep your centre strong, and you'll be in excellent shape.