Thank´s, but looks like to me that the Duke, by simple analisys, would come
to the existence of the Archbishop, the Centaur and the Amazon, just by
adding the Knight move to the Bishop, King and Queen, as he did to get the
Chancellor (Concubine).
Adding the moves of the King to the Bishop and Knight, he would come to
the Dragon Horse (Crowned Bishop) and to the Centaur (a Crowned Knight, to
keep the line of names of the Duke)(again), as he did to the Rook to get
the Dragon King (Crowned Rook). Add King moves to a Queen is useless.
So, it´s a mistery to me why he didn't used that pieces.