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Jeliss lists Circean piece, and Trenholme's list of games compiled Circe Chess in 1995. Bodlaender calls Circe Chess ''rather slow.'' Why? Because, the only ways to lose a piece are if, once ''captured,'' it has no legal return square or if that would result in check. The rule for RNB eliminates having to keep track of the exact originating square. Instead, the capturee is to be put back to the different-colour array square of its piece-type. Trenholme says same-colour, but either way it shrinks to one empty square only for the piece to stay on board. Like Alice Chess, where the original form is largely left alone, we have also uncharacterically been spared the umpteen variants possible of Circe, with nod to the progressive mutators to speed things up.