1.g4+	Kh4
2.Bh6!
With the threat Qh2#, so the bishop must be taken, but now the Black queen blockades her king...
2...	Qxh6
3.Qh2+	Kg5
4.Qd2+!	Nf4
Completing the blockade
5.Qd8#
Botvinnik (1925)