That was called “Ultimum” or “Ultima”.
The king was still called the king. The queen, bishop, knight, and pawn were called the “withdrawer”, the “chameleon”, the “long leaper”, and the “squeezer” respectively. One rook was turned upside down and called the “immobilizer”. The other remained rightside up and was called the “coordinator”.
The king moved like a king. The squeezers moved like rooks. All the other pieces moved like queens.
But the pieces had different methods of capturing. Only the king captured by landing on the piece to be captured.
The withdrawer captured by getting to the square adjacent (orthogonally or diagonally) to the piece to be captured, then withdrawing by moving any number of squares in the exact opposite direction.
The long leaper captured a piece by jumping over it. It could land on any square beyond the piece being captured.
The coordinator formed a rectangle with its own king, and captured any enemy piece(s) on the other two corners of the rectangle. For example, if there was a king on c3 and a coordinator moved to f7, it would thereby capture any enemy pieces on c7 and/or f3.
The squeezer captured by moving to a square adjacent (horizontally or vertically, but not diagonally) to an enemy piece, when there was already another friendly piece (squeezer or other) on the other side.
The immobilizer would not capture, but would immobilize any enemy piece on any adjacent (orthogonally or diagonally) square. The opponent would have to capture the immobilizer, or it would have to move away, in order to free the immobilized piece(s).
The chameleon captured as the captured piece would capture. It would land on the king, leap over the leaper, coordinate the coordinator, squeeze the squeezer, withdraw from the withdrawer, and immobilize the immobilizer.
I think one chameleon would immobilize the other, too.
I DID NOT MAKE THAT ONE UP.
Bill Smythe