Playing Against the London System with …Nbd7

The London System isn't about wild attacks — White wants a solid, space-holding setup with easy development. After 1.d4 d5 2.Nf3 Nf6 3.Bf4 Nbd7 4.e3, White has a compact centre and the bishop on f4 already active. Your task as Black is to challenge that centre before White gets to play c4 or e4 themselves. You're not worse by much, but you need a clear plan. If you play passively, White will slowly build up and you'll find yourself defending without counterplay. The good news: in over 105,000 games from this position, Black still wins 43.6% of the time — almost half.

Stockfish's top choice here is 4…e6, and it's also the most popular move in practice, appearing in 42,986 games. The idea is simple: open lines for your light-squared bishop, reinforce the d5 pawn, and prepare to strike back with …c5. After 4…e6, the engine continues 5.h4 — yes, an early h-pawn push — followed by 5…c5 6.c3. That h4 move isn't a mistake; it's a tricky attempt to create kingside space and sometimes trap your bishop if you play …Be7 and later …g6. Your response with …c5 is exactly right: hit back in the centre immediately. White scores 52.3% after 4…e6, the same as after 4…c5, so neither reply gives White a bigger edge — it's really about which kind of middlegame suits you.

Let's look at the most-played continuations side by side. After 4.e3, Black's options and White's winning percentages: e6 (42,986 games, White wins 52.3%); c5 (13,603 games, 52.4%); c6 (11,892 games, 52.6%); g6 (10,612 games, 50.5%); Nh5 (5,823 games, 52.3%); a6 (5,362 games, 51.2%). The big surprise? g6 gives White the lowest win rate at 50.5% — essentially equal. Fianchettoing your king's bishop can lead to a dynamic game where White's h4 push is less effective. But e6 and c5 are solid and principled. The important takeaway: avoid passive moves that don't challenge the centre. The London isn't dangerous if you fight back early.

Club players playing the London System often go on autopilot — they develop without thinking. If White pushes early for an attack with h4 (as in the engine line), or plays c3 without purpose, you can punish them by opening the centre with …c5 at the right moment. Your knight on d7 is well-placed to support …e5 breaks later, or to jump to f8 and defend the kingside. One common mistake to watch for: White playing Bg3 too early, retreating the bishop. That's a sign they don't have a clear plan. Counter by rushing …c5 and …Qb6, attacking the b2 pawn. The drill will show you exactly how the engine punishes any passive play.