Starting from 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5 5.Bf4 Bf5, players enter the Slav Defence: 1.d4 d5 2.c4... Bf5 — ECO D14. Lichess records 30,176 games in this line, which gives us a reliable view of how it actually performs in practice.
History and Notable Players
It arises from the Slav Defence: 1.d4 d5 2.c4... cxd5. On the White side, Ognjen Cvitan (37 games), Ulf Andersson (27 games), Igor Naumkin (23 games) top the database. Notable Black exponents: Eduard Meduna (37 games), Jonny Hector (23 games), Constantin Ionescu (18 games).
Move Diversity and Theory Depth
Move choice is far from uniform in the Slav Defence: 1.d4 d5 2.c4... Bf5. At 1200 Elo, the top reply is e3, played 54.6% of the time. There are 2 other moves seeing meaningful share, and 88.7% of games stick to established theory. Entropy: 1.87. By 2500, Nc3 dominates at 65.4% of replies; only 3 viable alternatives remain and 96.2% of moves are theory. Entropy drops to 1.41.
Common Mistakes
- Drifting away from main theory — At 400 Elo, theory adherence sits at 84% — versus 92.2% at 2000. The most popular deviation is Nc3 (played 37% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
- Neglecting development — Extra pawn moves in the opening are tempting, especially when you "know the moves". Developing a piece each turn is the simple correction.
- Releasing tension too early — The c4/d5 tension is the heart of these openings. Capturing or pushing prematurely usually surrenders the initiative.
Practice on Chessiverse
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