White's basic idea is to get the Black king on the b1-h7 diagonal
1.Qd4+	Kg5
2.Qf6+	Kg4
3.Qf3+	Kg5
4.Qg3+	Bg4
If 3... Kf5 4.Qd3+ wins the Black queen
5.Qh4+!!
This rather forces the issue! If 5... Kf5 6.Qf6+ Ke4 7.Qd4+ Kf5 8.Qd3+ or if 5... Kf4 6.Qf2+ Bf3+ 7.Qxf3+ Kg5 8.Qg3+ Kf5 9.Qd3+
5...	Kxh4
6.Bf6#
Troitsky (1916)