ok the link: https://www.chess.com/forum/view/chess960-chess-variants/bulldog-chess-with-witch-game
the thread about cow discussion-bulldog chess only

The witch is transparent to friendly pieces, and she also makes all adjacent pieces (friend and foe) transparent to friendly pieces (but pieces are not transparent for the witch). The witch does not capture other pieces, but she can be captured. Although pieces are not transparent to the witch, she is very agile; she combines the movement of queen, knight, and can jump orthogonally and diagonally two squares. Transparency of a piece means that other pieces can move, attack, and capture right through the piece.
you don't have to be a bulldog to play bulldog chess