Hard to resist...

...my favourite mate-of-the-moment, so here's something from the Chessbase site.

Black to play and win

I'm not sure I would find this over-the-board, at least not quickly. Initial move(s) are fine, but then there is a sticking point.

If you played the starting moves and hoped, you may well see it, but just visualising and calculating is a bit harder.

See the solution at Chessbase.