A fairy chess piece or unorthodox chess piece is a chess piece not used in conventional chess but incorporated into in certain chess variants and some chess problems. Fairy pieces vary in the way they move.
Because of the distributed and uncoordinated nature of unorthodox chess development, the same piece can have different names and different pieces the same name in various contexts.
Fairy chess pieces usually fall into one of three classes, although some are hybrids. Compound pieces combine the movement powers of two or more different pieces.