London System: one bishop move, several real openings

The London begins with d4 and an early Bf4, but strong London play is not an automatic seven-move setup. White uses c3 and Nbd2 in classical positions, switches to c4 when Black exposes b7, builds Nc3 and e4 against a fianchetto, and answers immediate central pressure before settling down.

Train the 12 London branches Back to all openings

Every branch is legal, source-backed and 19–21 plies deep.
The repertoire covers classical, tactical and fianchetto structures.
White's plan changes when Black plays ...c5, ...Qb6, ...Bf5 or ...g6.

The decision checklist

Has Black challenged d4 with ...c5 or ...e5?
Is b7 weak because the c8 bishop moved?
Can Ne5 be supported, or should White first secure d4?
Has Black castled into a prepared h-pawn attack?

The setup is a starting point. The opponent's pawn breaks decide which plan belongs on the board.

The repertoire map

Classical ...d5, ...Nf6 and ...e6

Build with e3, Nf3, Bd3, c3 and Nbd2. Preserve the dark-squared bishop with Bg3, then use Ne5 and f4 when the center supports a kingside initiative.

Early ...c5 and ...Qb6

Do not defend b2 automatically with b3. Rb1, dxc5 and active development can gain time on Black's queen. A separate tactical line teaches why grabbing b2 can be poisoned.

King's Indian or Grünfeld fianchetto

Use Nc3 and e4 to claim more center. Qd2 and long castling support Bh6 and h-pawn play, but ...h5 changes the position and usually demands patient development.

Dutch, Slav and ...Nc6 sidelines

Prepare e4 with f3 against the Dutch, switch to c4 and Qb3 against a Slav-style ...Bf5, and resolve immediate ...e5 pressure before completing the normal London setup.

The classical structure: secure d4, then occupy e5

After 1.d4 d5 2.Bf4 Nf6 3.e3 e6, White's common structure places pawns on d4, e3 and c3, knights on f3 and d2, and the light-squared bishop on d3. If Black offers a bishop trade with ...Bd6, Bg3 keeps the London bishop. A later ...Bxg3 hxg3 can be useful because the rook gains an open h-file.

Ne5 is the central outpost, not a move to play by reflex. It is strongest when c3 supports d4 and the bishop and f-pawn can reinforce the knight or recapture on e5. If Black can play ...e5 cleanly, Black has usually solved the main opening problem; White should therefore watch ...Qe7, ...Nbd7 and other preparations for that break.

When the standard setup is too slow

Black plays ...Bf5

The bishop has left c8 and b7 is no longer protected by it. White can play c4, Nc3 and Qb3, turning the game into a Queen's Gambit-style position with pressure on b7 and d5.

Black plays ...Bg4

The pin can increase pressure on d4. Because c3 clears the d1–b3 diagonal, Qb3 becomes available; Ngf3 and Bb5 develop actively instead of spending several tempi chasing the bishop.

Black plays ...c5 before ...d5

d5 gains space and denies Black a comfortable central majority. Nc3, e4 and Qd2 create a broad center, while Black normally answers with queenside play using ...a6 and ...b5.

The ...Qb6 test and the poisoned b2-pawn

Black's queen attacks both b2 and d4. Rb1 is often more useful than b3 because it protects the pawn without weakening c3, b4 and a3. White can then use dxc5 and Rc1 to develop with tempo, but must respect Black's central ...e5 break.

The trainer also includes the concrete Poisoned Pawn sequence 1.d4 d5 2.Nf3 Nf6 3.Bf4 c5 4.e3 Qb6 5.Nc3 Qxb2 6.Nb5. White is not winning merely because the queen moved twice: Nb5, a3 and pressure on c7 make the pawn grab dangerous. This is calculation, not permission to leave b2 hanging in every London position.

Fianchetto positions and the h-file attack

Against ...g6 and ...Bg7, Nc3 supports the e4 advance. Qd2, Bh6 and queenside castling can produce a direct attack, while Black races with ...c6, ...c5 or ...b5. The center and king positions matter more than completing a familiar c3 triangle.

If Black castles after White has prepared h4, h5 can drive open the h-file. The famous Rxh5 sacrifice is sound only in concrete positions where Qxh5 and Bd3 reach the king quickly. If Black plays ...h5 first, White should usually develop Nf3 and Be2, place a knight on e5 and build the attack rather than sacrifice automatically.

Important correction: London or Trompowsky?

One supplied caption sequence labels 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3 Qxb2 5.Bd2 as a Vaganian Gambit example. That is a Trompowsky move order because White's bishop went to g5, not f4. It is useful chess, but it is not included among these London trainer branches. The repertoire keeps the genuine Bf4 Poisoned Pawn line separate.

Train the London System with Free Chess Trainer

Open the trainer at the exact london-system repertoire.
Begin with the classical Ne5 main line, then work through all 12 branches.
Play White's decisions through a recognizable opening or early-middlegame plan.
Repeat the tactical branches until you can explain why the sacrifice or pawn offer works.

Start London System training

Related openings to explore

Queen's Gambit

The flagship 1.d4 opening, where White offers a flank pawn to gain lasting central control.

Catalan Opening

A powerful 1.d4 system combining Queen's Gambit structures with a kingside fianchetto.