Vacating the d1-square for the knight.

With the double intention of ...Bh6 and ...h4-h3.

10.h3 was better, when 10...Rc8 keeps the advantage.

A blunder; Although after 12.Nd2 Nxd4! 13.exd4 Bxd2 Black wins anyway.

In view of the mate, White resigned.

Preparing Bd3, followed by the doubling of the major pieces on the f-file in order to attack the weaknesses on f7 and h4.

By placing the rook at the front White achieves an attack on both pawns at the same time.

4...h3 5.Qf2 , followed by Rh4, and the h3-pawn is doomed.

Preparing h2-h4 with a decisive advantage.