Openings
The London System: Setup and Plans
The London System is a setup opening for White built around 1.d4, an early Bf4, and a solid pawn triangle on c3, d4 and e3. Instead of memorizing long forcing lines, you aim for roughly the same formation against almost anything Black plays. That makes it popular with club players who have limited study time, and grandmasters such as Magnus Carlsen have also used it to reach playable middlegames without heavy theory. The London is not a magic formula, though. It works best when you understand why each piece goes where it goes and how to react when Black attacks the setup directly.
The basic setup
The target formation is: pawns on d4, e3 and c3; bishop on f4 (often retreating to g3 later); knights on f3 and d2; light-squared bishop on d3; king castled short. A typical position against a classical ...d5 setup arises after 1.d4 d5 2.Bf4 Nf6 3.e3 e6 4.Nf3 c5 5.c3 Nc6 6.Nbd2 Bd6 7.Bg3 O-O 8.Bd3.
Each part of the setup has a purpose. The bishop on f4 develops outside the pawn chain before e3 locks it in, which is the main difference from older, more passive Queen's Pawn systems. The c3 pawn supports d4 and gives the queen a path to b3 or c2. The knight goes to d2 rather than c3 so that it does not block the c-pawn and can later support e4 or jump to f3 if the other knight moves. The bishop on d3 aims at h7, which becomes important in kingside attacks.
Move order matters
Modern London players usually play 2.Bf4 straight away, before Nf3. The reason is simple: if White plays 2.Nf3 first, Black has extra options such as an early ...Bg4 or setups where ...Nh5 can hit the bishop as soon as it arrives on f4. Getting the bishop out early also avoids the problem of forgetting it and playing e3 first, after which the bishop is stuck behind the pawn.
Another key move-order point is the retreat Bg3 when Black plays ...Bd6. If White allows ...Bxf4 exf4, the pawn structure changes and White loses the bishop that defines the system. Retreating to g3 keeps the bishop and, if Black takes on g3, White recaptures with the h-pawn, which opens the h-file toward Black's king.
Plans against ...d5 setups
Against ...d5, ...e6 and ...c5, White's main plans are:
- Ne5 and a kingside attack. The knight jumps to e5, supported by d4, and is often reinforced with f4. Combined with Bd3 and the queen coming to f3 or h5, this creates direct pressure on h7.
- Central expansion with e4. With Nd2, Qe2 or Qc2 and Bd3, White can sometimes play e4 to open the center while White's pieces are better placed.
- Patience. If Black plays well and nothing is happening, the London is fine with a slow game. Moves like h3, Qe2 and Rfe1 improve the position without creating weaknesses.
A model example of the Ne5 plan arises after 1.d4 d5 2.Bf4 Nf6 3.e3 e6 4.Nf3 Bd6 5.Bg3 O-O 6.Bd3 c5 7.c3 Nc6 8.Nbd2 b6 9.Ne5. White's knight is strongly placed, f4 may follow to cement it, and ideas such as Qf3 and g4-g5 to drive the f6 knight away from the defense of h7 are on the table.
Play through the Ne5 plan →Plans against ...Nf6 and ...g6
Many Black players answer the London with a King's Indian style setup: ...Nf6, ...g6, ...Bg7, ...O-O and ...d6. Here the bishop on g7 bites on the d4 pawn and Black aims for ...e5 or ...c5. A sensible setup is 1.d4 Nf6 2.Bf4 g6 3.e3 Bg7 4.Nf3 O-O 5.Be2 d6 6.h3.
The move h3 is important in this structure: if Black plays ...Nh5 to hit the bishop, White can retreat to h2 and keep it. The bishop often goes to e2 rather than d3 because there is no pawn on d5 to block the f5 square, and ...e5-e4 could otherwise fork pieces. Some White players also choose a more aggressive plan with h4-h5 to attack the fianchettoed king, which can be very effective against careless opponents.
The ...c5 and ...Qb6 problem
The biggest practical issue in the London is the pressure on b2. Because White's dark-squared bishop has left c1, the b2 pawn has fewer defenders, and a black queen on b6 attacks both b2 and, through c5 pressure, the d4 pawn. For example, after 1.d4 Nf6 2.Bf4 c5 3.e3 Qb6, the threat is ...Qxb2.
White has several decent answers. 4.Qc1 simply protects b2, though it is a bit passive. 4.Nc3 allows ...Qxb2 as a pawn sacrifice in return for activity, which is only for players who know the follow-up. Many players prefer to prevent the issue earlier: in the ...d5 lines, after 1.d4 d5 2.Bf4 c5 3.e3 Nc6 4.c3 Qb6 5.Qb3, White offers a queen trade. If Black trades, White's doubled b-pawns after axb3 are not a problem and the a-file opens for the rook.
See the Qb3 answer to ...Qb6 →The broader lesson: when the c1 bishop leaves early, always check what happens to b2. Many London games are lost by players who play Nf3, Nbd2 and Bd3 automatically and simply drop the b-pawn.
Typical kingside attack ideas
- The Bxh7+ sacrifice. With a bishop on d3, a knight that can reach g5 and the queen able to reach h5, the classic Greek Gift is a recurring theme. Check that Black's knight is not on f6 to defend h7 before trying it.
- Ne5, f4 and Rf3. A Stonewall-like build-up where the rook lifts to the h-file.
- The h-file after Bxg3. If Black trades on g3 and White recaptures hxg3, a rook on h1 is suddenly active, especially if White has not castled short.
- g4-g5. Kicking the f6 knight removes the main defender of h7.
How to practice this
- Play ten games as White against the computer using only the London, and after each one check the opening on the analysis board.
- Note every game where b2 or d4 came under fire, and decide on a fixed answer to ...Qb6 for each setup.
- Study attacking the castled king to turn the solid London setup into a real attack.