I always play like this...
Mate in 4!
Mate can be much simpler buy moving B queen forward one square. W bishop goes back to challenge queen. B bishop moves forward to block king, and 1-2 moves till checkmate without having 2 kights.
What about:
1...Qxh2+
2.Kxh2 Ng4+
3.Kg1 Bxf2+
4.Kf1 Bg2#
I like this better because of the bishop/knight symmetry at the end.

! No mistakes
!
In this game, Wilfred Pratten turned his own pieces into bait while setting up a nice Queen SAC followed up by a two Knight finish! Maczynski never knew what hit him. After 18...Nf6, White would either be without a King OR without a Queen. Now, White just played 19. Qxh8. Can you find the four move win? This is an easy-intermediate puzzle. : )