The only defence

Surrendering the d4-pawn in order to create a double threat at g4 and b8.

In this complex position, White can fight for an advantage.

Unlocking White's queenside in order to enhance an attack on the exposed king on h2.

With the simple threat of 5...Nxb5.

5.Ne2 Rc2! -+
5.Rc2 Nxb5 6.Rdc1 d4! 7.exd4 Nxd4 8.Ra2 Ne2 -+

White resigned.

A clever attack on Black's pawn chain.

1...cxb4 2.c5! with similar consequences.