The Caro–Kann Defence: 1.e4 c6 2.Nf3... Bg4 begins with 1.e4 c6 2.Nf3 d5 3.Nc3 Bg4 (ECO B11). With 2,426,300 games on record, the patterns below come from the largest practical sample available.
History and Notable Players
It arises from the Caro-Kann Defense. Among the most prolific White practitioners are Shanglei Lu (22 games), Sergei Azarov (20 games), Miguel Munoz Pantoja (19 games). Black-side regulars include Aleksey Dreev (36 games), Valentina Gunina (23 games), Arturo Pomar Salamanca (20 games).
Performance Across Rating Levels
Popularity and results vary sharply by rating level. The 1200 bracket has 243,417 games (0.04% of all games at that level); White wins 46.6%, Black 49.6%, 3.8% are drawn. Move up to 1800 Elo and the share shifts to 0.05%, with White winning 46.2% versus Black's 48.8%. At 2500, 0.26% of games go into this opening; draws sit at 10.4% — the line is well-mapped at this level. Positions also become less sharp as level rises (sharpness 0.96 → 0.90).
Time Control Patterns
The Caro–Kann Defence: 1.e4 c6 2.Nf3... Bg4 skews toward blitz chess. In bullet, it appears in 0.04% of games (1,052,094); White wins 45.9%. Blitz shows 0.05% adoption across 1,879,407 games, White scoring 46.3%. In rapid, the share rises to 0.05% — 546,893 games, White 46.1%.
Move Diversity and Theory Depth
Move choice is far from uniform in the Caro–Kann Defence: 1.e4 c6 2.Nf3... Bg4. At 1200 Elo, the top reply is h3, played 29.5% of the time. There are 5 other moves seeing meaningful share, and 78.8% of games stick to established theory. Entropy: 2.38. By 2500, h3 dominates at 88.7% of replies; only 1 viable alternatives remain and 97.1% of moves are theory. Entropy drops to 0.73. That entropy collapse is the signature of a line where preparation pays off: at the top, players know the best move and play it.
Historical Trends
Long-term, the trajectory of this opening is informative. Adoption peaked in 2025 at 0.06% (442,341 games). 2025 marks the high — the opening is rising, currently at 0.06%.
Common Mistakes
- Drifting away from main theory — At 400 Elo, theory adherence sits at 72.8% — versus 88.3% at 2000. The most popular deviation is Be2 (played 23% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
- Neglecting development — It can feel productive to make extra pawn moves early, but falling behind in piece development is what loses most amateur games — especially in open positions where active pieces find squares fast.
- Drifting into passivity — These openings are solid, but solid is not synonymous with passive. Look for the right moment to break with a central pawn advance — without it, your pieces stay cramped.
Practice on Chessiverse
Ready to try the Caro–Kann Defence: 1.e4 c6 2.Nf3... Bg4 against a bot? Pick an opponent at your level and play a game.
