Pressburger King (Super-Transmuting King): King which definitively takes up the nature of the checking piece (and thus loses his royal status). (OR: After being checked, the Super-transmuting King must immediately move like the checking piece and then losing his royal status definitively takes up his nature. When no such move is available, the ST-King side parries the check normally. If the checked King cannot move, it is a mate.)

Locust (L): Moves along Queen lines only by capturing an enemy unit, arriving on the square immediately beyond that unit, which must be vacant.

Bishop-Locust(LR): (1,1) Locust. Operates along Bishop lines.

Nightrider-Locust(LN): (1,2) Locust. Operates along Nightrider lines (Nightrider: (1,2) Rider. Operates along straight lines with squares lying a Knight’s move away from each other.)

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.

Chameleon: 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.