Composing chess problems
Let's say you find an interesting mating motif. Now you want to use it as the final position of a chess problem you will compose. The moves leading to it must be imaginative, clever and not very easy to find. But they must also be unique. There mustn't be alternative sets of move that lead to the final (or any) mate. For amateur composers, here's an example of a fellow amateur making a valid problem out of the position displayed.
Source: chessbase.com