4.Bf4 with ...c5 is variation 5 of 6 in the Grünfeld Defence course, a advanced opening course for Black (ECO D82). It runs 24 moves and begins 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 …. White develops the bishop to f4 and plays e3, hoping for a solid edge. Black hits back with ...c5 and ...Qa5, regains the pawn on c5 and develops with easy play. In the lesson every move is explained on a board and then drilled; it is free.
Move by move
1. d4 – White occupies the centre.
1... Nf6 – Develops and controls e4.
2. c4 – Gains space.
2... g6 – Prepares ...Bg7.
3. Nc3 – Develops.
3... d5 – The Grünfeld.
4. Bf4 – Develops the bishop outside the pawn chain, eyeing c7.
4... Bg7 – Fianchettoes.
5. e3 – Supports d4 and frees the f1 bishop.
5... c5 – The sharpest answer: hits d4 at once.
6. dxc5 – Takes the pawn; White hopes to keep it.
6... Qa5 – Pins the c3 knight and prepares to regain the pawn on c5.
7. Rc1 – Defends the c3 knight a second time, so ...Ne4 has less force.
7... dxc4 – Opens the position before White can develop the f1 bishop with tempo.
8. Bxc4 – Recaptures and develops.
8... O-O – Castles before regaining the pawn.
The lesson goes on for 8 more moves, each with its explanation.
chessGM