More precise was 4...f2! first, e.g. 5.Qe3 Ne5 6.g5 Qf3+ 7.Qxf3 Rxf3 with a clear advantage – Ni Hua.

Preparing 8...Rf8, followed by ...f3-f2.

With the strong threat of 11...f2.

Decisive. There followed:

And Black soon won.

In order to undermine the enemy blockade by 2...Qb4.

3.Qxb4?! cxb4 the black knight enters on c5 with great effect.

After breaking the white blockade, Black is able to move his queenside majority forward.

For better or worse, the active 8 e5 had to be tried.

Suddenly the c-pawn has turned into a major factor.