Chameleon Chess: All pieces on the board which are displayed as orthodox Q, R, B, S, are Chameleons (On completing a move, a Chameleon (from classical standard type) changes into another piece, in the sequence Q-S-B-R-Q… Promotion may be to a chameleon at any stage in the cycle). A Pawn can promote only in Chameleon-pieces.

Neutral piece: Belongs to whichever side chooses to use it. It can therefore be moved or captured by White or Black, and in Circe it is reborn according to capture. A King may not be moved onto a square controlled by a neutral piece, because of self-check.