Against the Queen's Indian setup (...b6) is variation 4 of 6 in the London System course, a beginner opening course for White (ECO A46). It runs 19 moves and begins 1. d4 Nf6 2. Bf4 e6 3. e3 b6 4. Nf3 Bb7 …. Black fianchettoes the light-squared bishop with ...b6 and ...Bb7 to control e4. White plays h3, c3, Nbd2 and Bd3, then aims for e4 with Qe2. In the lesson every move is explained on a board and then drilled; it is free.
Move by move
1. d4 – Takes the centre and opens a path for the dark-squared bishop.
1... Nf6 – Black stops e4 and keeps options open.
2. Bf4 – The London bishop leaves before e3.
2... e6 – Opens the f8 bishop and prepares a flexible setup.
3. e3 – Supports d4 and opens the f1 bishop.
3... b6 – Prepares ...Bb7 to control e4, the square White wants for a central break.
4. Nf3 – Develops and covers e5 and d4.
4... Bb7 – The bishop on the long diagonal watches e4 and, after ...Ne4, supports the knight.
5. h3 – Prepares a retreat for the f4 bishop on h2 and stops ...Nh5 chasing it.
5... c5 – Hits d4 from the side, the usual queenside counterplay.
6. c3 – Supports d4 so that ...cxd4 can always be met with exd4 or cxd4.
6... Be7 – A modest but solid square, preparing to castle.
7. Nbd2 – The knight supports e4 and keeps the c-pawn free.
7... O-O – Black's king goes to safety.
8. Bd3 – Aims at h7 and adds a second piece to the fight for e4.
8... d5 – Black stakes a claim in the centre and stops e4 for now.
The lesson goes on for 3 more moves, each with its explanation.
chessGM