Stipulation ser-r<>r15: White plays a series of 15 moves and on the last move black helps white to swap 2 pieces from the diagram by mean of a reflex move with re-birth of one white piece.

Circe Couscous: As Circe, but the captured piece reappears on the Circe rebirth square of the capturing unit. Pawns reappearing on promotion squares are promoted instantly, at the choice of their own side.

Circe: Captured units (not Ks) reappear on their game-array squares, of the same colour in the case of pieces, on the file of capture in the case of pawns, and on the promotion square of the file of capture in the case of fairy pieces. If the rebirth square is occupied the capture is normal.