4.g3 Bb7: the traditional line is variation 2 of 5 in the Queen's Indian Defence course, a advanced opening course for Black (ECO E19). It runs 24 moves and begins 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 …. Black puts the bishop on b7 and fights for e4 with the pieces. After 7.Nc3 Ne4 Black trades a pair of knights. Then Black hits the centre with ...c5 and keeps a balanced game. 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.
1... Nf6 – Black develops and watches e4.
2. c4 – White gains space.
2... e6 – Black opens the f8 bishop.
3. Nf3 – White develops and avoids the pin on c3.
3... b6 – The Queen's Indian. The bishop will fight for e4.
4. g3 – White prepares to put the bishop on g2.
4... Bb7 – The classical move. The bishop controls e4 from afar.
5. Bg2 – Both bishops now face each other on the long diagonal.
5... Be7 – Black gets ready to castle. This is the most solid set-up.
6. O-O – White castles.
6... O-O – Black castles.
7. Nc3 – The main move. White wants to push the e-pawn to e4 and take the centre.
7... Ne4 – The key move. Black puts the knight on e4 and offers trades.
8. Qc2 – White attacks the knight a second time.
8... Nxc3 – Black trades the knight.
The lesson goes on for 8 more moves, each with its explanation.
chessGM