How a Simple Formula Powers Legal Multi-Card Moves in FreeCell Games

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A FreeCell 'supermove' is not a special rule but a shorthand for a series of single-card moves routed through temporary free cells and empty tableau columns. The maximum number of cards movable at once follows the formula (F + 1) × 2^C, where F is the count of empty free cells and C is the count of usable empty columns. A key edge case requires excluding the destination column from storage if it is itself empty, which halves the effective capacity. Validating a move also requires checking that the card run descends by one rank and alternates color. Placing this logic in a dedicated, pure function keeps move rules consistent across drag-and-drop, keyboard controls, undo, and automated solvers.

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