Two boards and pieces can teleport from one board to another. Portuguese Progressive Chess . Progressive chess variant where you move each piece at most once. By Joao Pedro Neto. Potential Chess .
Pieces start out as any piece and become a particular piece depending on how they move.
By David Howe. Pieces may move like lower-ranked piece, but when doing so, become that lower ranked piece. By Peter Aronson. 4-Player Pothole Chess . Bulldozers and cars and other vehicles are pieces in 4-player chess variant.