1...	Qe1!
2.Qxa8+	Kf7
And there is no defence to either [A]
3...	Ng4+
4.hxg4	Qh4#
or [B]
3...	Bg1+
4.Kh1	Bf2+
5.Kh2	Qg1#
If White tries 3.Be3 then 3... Ng4+ 4.hxg4 Qh4+ 5.Kg1 Bxe3+ and 6.Kf1 Qf2#
Hennings-Dane (1959)