Black can only keep the material balance by surrendering the b1-h7 diagonal.

Fixing a weakness on h7.

9...dxc4 10.Bxc4 Nd5 11.Bxd5 exd5 12.e6! +-

followed by Rc3 with a decisive attack.

Preparing ...h5-h4 in order to fix the g3-square and indirectly weaken the f4-pawn. It is important to realize this idea before White manages to play 2 Bf3 followed by g2-g3, after which he could meet ...h5-h4 by g3-g4.

The most powerful way of doubling the rooks.

8.Nd4 Rc3 intending ...Nd5.

Heading for b8 in order to attack the weakness at b3.

. After this exchange White won't be able to cover both weaknesses at b3 and f4.

2.Rxc1 Qxc1+ White loses the f4-pawn.