Alphabetic Chess: The squares are considered in the order a1, a2…a8, b1…b8, c1 and so on to h8. At each turn, only the unit standing on the square which comes earliest in this order may move. However check and mate are normal.

Equipollent Circe: After a capture the captured piece is reborn on a square defined with respect to the square where it stood before its capture, as follows: The rebirth square lies in the same direction as that of the capturing move and at a distance equal to the length of that move. If the rebirth square is occupied or would be off the board the capture is normal. [“Equipollent” simply means “equivalent”.]