Followed by ...h5-h4, and Black went on to win.

Clearing the way for the rook towards the weak square at c6.

Seizing the seventh rank.

White is practically winning.

Exploiting the tactical motifs along the f-file and the h2-b8 diagonal in order to launch an attack.

2.h3? Nd4! 3.Nxd4 Bh2+ 4.Kf1 Rxf2+ 5.Qxf2 Nxf2 6.Kxf2 Qg3+ -+

4.h3 e5! White is also in big trouble.

Not just attacking the knight, also mobilizing the remaining pieces to the kingside. There followed:

And the attack soon took its toll.