4.Bd2 Qe7 5.g3 Nc6: main line is variation 1 of 6 in the Bogo-Indian Defence course, a intermediate opening course for Black (ECO E11). It runs 24 moves and begins 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Qe7 …. Black keeps the bishop with 4...Qe7 and develops the knight to c6. After 6.Nc3 Black gives the bishop for the knight and jumps to e4. Black then plays ...d6 and ...e5 for a solid, balanced centre. In the lesson every move is explained on a board and then drilled; it is free.
Move by move
1. d4 – White takes the centre and opens the c1 bishop.
1... Nf6 – Black develops and keeps an eye on e4.
2. c4 – White gains space on the queenside.
2... e6 – Black opens the f8 bishop.
3. Nf3 – White develops and keeps the knight off c3, where it could be pinned.
3... Bb4+ – The Bogo-Indian Defence. Black develops the bishop with check.
4. Bd2 – The most common answer. White blocks the check and offers to trade bishops.
4... Qe7 – Black keeps the bishop and guards it with the queen. The queen also supports a later push to e5.
5. g3 – White plans to put the bishop on g2.
5... Nc6 – The knight develops and supports e5. It also adds pressure on d4.
6. Nc3 – White develops and lets Black take on c3.
6... Bxc3 – Black trades the bishop for the knight.
7. Bxc3 – White takes back with the bishop and keeps a good pawn structure.
7... Ne4 – The knight attacks the c3 bishop. Black is happy to trade more pieces.
8. Rc1 – The rook guards the bishop.
8... O-O – Black castles.
The lesson goes on for 8 more moves, each with its explanation.
chessGM