Chessy
The London System Bf5 Line: Navigating the 4.Ne5 Position
You've played 1.d4, 2.Nf3, and 3.Bf4 — the London System — and Black has mirrored your bishop with 3...Bf5. The natural next move for White is 4.Ne5, centralising the knight and threatening to disrupt Black's setup. With 10,092 games in the database, this position is a critical early test of your understanding. The engine evaluates it at -0.20, which is essentially dead level: the position is equal, and the game is still wide open. Below you can drill the position against our adaptive engine to build the right instincts from move 4 onward.
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At a glance, the position after 4.Ne5 looks sharp — your knight has jumped to e5 while Black's bishop sits actively on f5. But the engine's evaluation of -0.20 confirms that neither side has gained an edge yet. Your goal here is simple: complete development without letting Black's light-squared bishop or queen-side activity become annoying. The symmetry in the centre (d4 vs d5, Nf3 vs Nf6) means small differences matter. Your knight on e5 is slightly forward but can be challenged; Black's next move will tell you whether they plan to kick it, support their own centre, or develop calmly. Stay principled — you're not better, but you're not worse either.
Black's Most Popular Reply: 4...e6
By far the most common response, appearing 5,684 times in the database, is 4...e6. Black solidifies the d5 pawn and prepares to develop the kingside. This is also the engine's top pick. After 4...e6, White's best continuation is 5.e3, supporting the d4 pawn and opening the diagonal for your light-squared bishop. Black typically follows with 5...Nfd7, attacking your knight on e5, and the engine line continues 6.Nxd7 Qxd7. You win a tempo but trade your active knight for Black's pinned knight — a fair exchange. White's winning chances here are roughly 42.7%, compared to 51.7% in the overall position, so this line is slightly tougher for you but fully playable. Just develop naturally, castle, and the game remains equal.
The Surprising 4...Ne4: A Gift to Punish
One of the most interesting statistics is what happens after 4...Ne4. Black plays this only 380 games out of 10,092 (under 4%), but White scores a whopping 60.3% — the best win rate of any reply. Why? Because 4...Ne4 is actually a mistake, losing about 1.2 pawns in evaluation. The knight jumps forward but accomplishes nothing; it can be chased away or traded off. The engine says Black should have played 4...e6 instead. If you face 4...Ne4, stay calm: you can simply develop with e3 or attack the knight with moves like Nbd2 or c4. Don't try anything flashy — just punish the overambitious knight with solid play, and the position will tilt in your favour.
Recognising the Most Common Mistake: 4...Nc6
The third most popular move, 4...Nc6 (1,114 games), is classified as an inaccuracy, costing Black about 0.5 pawns. Black develops the knight to a natural square but runs into trouble because... well, it's a knight on c6 attacking your e5 knight, but after you defend it or retreat, Black's knight has no clear follow-up. The engine recommends 4...e6 instead. If your opponent plays 4...Nc6, you have a small edge — nothing crushing, but a tangible plus to work with. Black still scores only 44.3% of the wins from here. This is a good example of why the London System is solid for club players: Black's 'natural' developing moves can actually be slightly inaccurate against the precise setup you've built.
Results across 10,092 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| e6 | 5,684 | 42.7% |
| Nbd7 | 1,708 | 45.0% |
| Nc6 | 1,114 | 44.3% |
| Ne4 | 380 | 60.3% |
| h6 | 215 | 41.9% |
| c6 | 199 | 43.7% |
Frequently asked questions
Is the London System Bf5 line good for White?
The engine evaluates the position after 4.Ne5 at -0.20, which means the game is completely level — neither side has an advantage. White scores 44.7% wins, Black 51.7%, with 3.6% draws. It's a solid, principled line, not a winning try out of the opening.
What is the best response for Black after 4.Ne5?
The engine's top choice and most-played response is 4...e6, which prepares to challenge the knight with ...Nfd7. The recommended continuation is e3 Nfd7 Nxd7 Qxd7, leading to an equal middlegame.
Why is 4...Ne4 a mistake in this position?
4...Ne4 loses about 1.2 pawns in evaluation according to Stockfish. While it looks active, the knight becomes a target and Black doesn't have enough compensation. White scores 60.3% from this position — the best win rate against any Black reply.
What happens if Black plays 4...c6?
4...c6 is played only 199 times and leads to a 43.7% win rate for White. It's a solid but passive move that prepares ...b5 or ...dxc4 ideas. The engine still prefers 4...e6. You can continue developing with e3 or c4 as usual.
How many games feature the Queen's Pawn Game: London System: Bf5?
Over 10K Lichess games have reached the Queen's Pawn Game: London System: Bf5 position. White wins 44.7%, Black wins 51.7%, with 3.6% draws — based on real rated games.