9.dxc5 Bxc5: the d4 push is variation 2 of 6 in the Tarrasch Defence course, a advanced opening course for Black (ECO D34). It runs 28 moves and begins 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 …. White takes on c5 and Black takes back with the bishop. After 10.Bg5 Black pushes ...d4. The isolated pawn becomes a strong pawn that cramps White's knight. Black keeps an active 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... d5 – Black claims an equal share.
2. c4 – The Queen's Gambit.
2... e6 – Black supports d5.
3. Nc3 – White attacks d5 again.
3... c5 – The Tarrasch Defence. Black hits d4 at once.
4. cxd5 – White takes on d5.
4... exd5 – Black takes back. The d5 pawn is now isolated.
5. Nf3 – White develops.
5... Nc6 – Black develops and presses on d4.
6. g3 – The bishop will go to g2 and aim at d5.
6... Nf6 – Black defends d5.
7. Bg2 – The bishop takes the long diagonal.
7... Be7 – Black gets ready to castle.
8. O-O – White castles.
8... O-O – Black castles too.
The lesson goes on for 12 more moves, each with its explanation.
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