Editing Chess problem (section)

==Features==
Not every chess problem has every one of these features, but most have several:

* The position is ''composed'' – that is, it has not been taken from an actual game, but has been invented for the specific purpose of providing a problem.  Although a constraint on orthodox chess problems is that the original position be reachable via a series of legal moves from the starting position, most problem positions would not arise in over-the-board play.
* There is a specific ''stipulation'', that is, a goal to be achieved; for example, to checkmate Black within a specified number of moves.
* There is a ''theme'' (or combination of themes) that the problem has been composed to illustrate: chess problems typically instantiate particular ideas.
* The problem exhibits ''economy'' in its construction: no greater force is employed than that required to render the problem sound (that is, to guarantee that the problem's intended solution is indeed a solution and that it is the problem's only solution).
* The problem has {{em|aesthetic value}}. Problems are experienced not only as puzzles but as objects of beauty.  This is closely related to the fact that problems are organised to exhibit clear ideas in as economical a manner as possible.