In order to meet Qh4 by 6.Qg3.

Heading for h5.

Exposing the major pieces to a fork. 8.Nd2!? , intending Rfd1 and Nf1, seems preferable.

With the double idea of 11...Nd5 and Nf5-h4.

The last chance was 12.Nxe3 Bxh3 13.Bf3

White resigned in view of 13.Bxd5 Bxd5 with the double threat of 14...Rxe3 and 14...Rg6+.

Intending g2-g3 in order to clear the g-file towards the target on g7.

Black sacrifices a pawn, aware that after 2...fxg3+ 3.Rxg3 he couldn't save it anyway; e.g. 3...Rh6 4.Bc4! Re8 5.Rcg1 Nf8 6.Nc5 with the inevitable threat of 7 Nxe6+.

A strong breakthrough that creates a passed pawn, as well as a protected square for the knight on d4.