פתרונות ואיכות

The correct first move that begins the actual solution of a problem, especially a directmate.

A nearly correct first move that fails to exactly one Black defense, called the refutation.

Virtual play already prepared in the initial position before the actual first move of the solution.

Thematic play contained in hypothetical possibilities of a composition even though it is not the line ultimately carried out.

The property that a chess composition has exactly its intended solution and no defect that invalidates it.

An unintended solution that begins with a different first move from the author's solution and makes the composition unsound.

A situation in which more than one continuation satisfies the composition's task after the first move.

The situation in which an identical chess composition already has an earlier priority date.