Amateur

White has a huge but scattered material advantage, leaving his King in a precarious position. In this kind of position Black must attack, as advised by Alekhine: "Attack! Attack!" 
A. 1. ... Qg5 2.Kf1 BxB+ 3.Kg1 f3 wins 
B. 1. ... Qg5 2.BxB Qxg2+ 3.Kd1 Qxd5+ 4.Ke2 QxN+ 5.Bd3 f3+ 6.Kxe3 Qg5+ 7.Kf2 Bd4+ 8.Kf1 Qg2 mate 
C. 1. ... Qg5 2.Qg1 BxB+ 3.KxB Qxd5+ 4.Ke2 QxN+ 5.Ke1 Qxb2 6.Rd1 Bc3+ 7.Kf1 Qb5+ 8.Rd3 QxR+ mate 
D. 1. ... Qg5 2.Kd1 BxB threatening Qh5+ etc. 
There are many possible continuations, but with best play Black should win.

Amateur

White's King is in a precarious position. Black's well-placed pieces are ready to deliver a blow. 
1. ... Qg5! 
2.BxB Qxg2+ 
3.Kd1 Qxd5+ 
4.Ke2 QxN+ 
5.Bd3 f3+ 
6.Kxe3 Qg5+ 
7.Kf2 Bd4+ 
8.Kf1 Qxg2+ mate 
There are other continuations but with best play Black should win.