Circe Chess   This page is still far from complete !!   Circe
Chess is a fairy variant of chess where captures entail the
immediate rebirth of the captured piece on some rebirth square.
When the rebirth square is not empty after the capture, there is
no rebirth and the captured piece is removed for good. Of
course, when the rebirth puts the capturing side under check,
the capture is not legal.  The rebirth square is the home square
for Queens. For Bishops, Rooks and Knights the rebirth is the
home square having the color of the capture square. For Pawns,
it is the second square on the capture file. E.g. if Wh.
captures Bl. Pa4, Pa5, Ra6, Ra7, Na8, the rebirth squares would
be respectively a7, a7, a8, h8, g8.  Before you ask: Of course
you may castle with a reborn rook.  Fairy units are reborn too.
There are two cases: when the fairy unit has a clear home
square, like e.g. Nightriders used in place of Knights, it is
reborn there. In other cases, like e.g. Grasshoppers, the fairy
unit is seen as a promotee and