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Phases of play are parts of a chess problem which happen, as it were, concurrently rather than consecutively.

Each problem has at least one phase: the post-key play or actual play; that is, the play after the key being fulfilled]. Other phases, which may or may not be present, are:

A problem with n phases is called an n-phase problem. So a problem with set play and three tries, for example, is a five-phase problem.

Each phase may contain a number of variations , but variations do not constitute distinct phases in themselves.