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Constrained problem

A constraint, in part of the stipulation, limits the range of possible solutions.

- If in a retro problem, it will limit the histories of the game. It may be specified directly (e.g. "The bBc8 has not yet moved.") or it is implied in a question. (e.g. "Was the first move a2-a3 possible?" or "Shortest route of bK?")

- It was also quite common in old style direct moremovers: e.g. "#5 with Sg6"