The departure of White's bishop has left him vulnerable on the dark squares.

Increasing the pressure on the c-file.

Black has a clear initiative.

By means of a minor tactical resource, Black manages to improve his badly placed knight.

2.axb4?! cxb4 3.Nb5 b3+ Black wins.

After an unusual manoeuvre the knight has become a great piece.

The only way of escaping from the pin.

Black has the initiative.

Preparing a little trick that will alter the position in Black's favour.