Chameleon Chess: All pieces on the board which are displayed as orthodox Q, R, B, S, are Chameleons. A Pawn can promote only in Chameleon-pieces. (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).

Circe Chameleon: When a piece is captured it transforms according to the scheme S>B>R>Q>S, then it is replaced on its Circerebirth square (game-array squares, of the same colour in the case of pieces, the file of capture in the case of pawns, the promotion square of the file of capture in the case of fairy pieces.).

Einstein Chess: All units (Ks excluded) change their type when they move, according to a precise pattern. For non-capture moves: Q>R, R>B, B>S, S>P, P remains P. For capture-moves: R>Q, B>R, S>B, P>S, Q remains Q.