Written on the toilet wall

An interesting idea at this years Olympiad. Above the urinals in the (by necessity) Mens toilet, there are posted some chess problems (inside little frames which I suspect are normally used for advertising posters). I guess the idea is to give you something to do, while you have something else to do. The diagrammed position is one of the puzzles. I do not know who composed it, so I will refer it as Urinal Puzzle, 3rd trough from the left. It is White to play and Mate in 11.