I call this "All The King's Men" because lots of White's pieces are needed in this selfmate. It was somewhat of an accident actually, but it is still a pretty position in my opinion.
It's whiteto move and the goal here is to selfmate themselves in 14 moves. Naturally, Black tries to prolong their resistance for as long as possible.
EDIT-Sorry for changing the diagram so much, but I just keep finding ways to use less and less pieces! This will my last change to the diagram, I swear!
Also, shoopi's answer contains a wonderful example for a stragety on hoq to solve this problem. The solution adheres to the original diagram, but it is still useful, helpful, relavant, and outstanding