The game's name isn't just marketing; it technically utilizes 5 dimensions, although players usually interact with 4 at a time.

The sequence of turns within a single timeline. Moving a piece "back in time" shifts it to a board representing a previous turn.

Parallel timelines. Moving a piece to a past board creates a new timeline branch, essentially a "spatial" move between different game instances.

The standard horizontal and vertical ranks and files on a single chessboard.