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'Here's another funny observation: The Ferz is at the same time colourbound and colourchanging. It is bound to one half of the possible squares, but with each move it changes from one quarter of squares to the other.' -- Jörg Knappen [4 Dec 2001].

In other words, the light squares on odd numbered ranks make up 25 percent of the chessboard and the light squares on even numbered ranks make up another 25 percent (true for any rectangular board with an even number of squares along each side). The Dabbabah and the Dragon are restricted to 25 percent of the chessboard. The Ferz and the Spotted Gryphon can reach 50 percent of the squares on the board, but always alternate between an odd numbered rank and an even numbered rank. None of these pieces: Wazir, Knight, Ferz, Spotted Gryphon are able to triangulate, they each take an even number of moves to return to their starting square.

I found the comment quoted above by looking at a nonindexed page on this site: Recent Ratings and Comments, which actually covers old comments from [27 May 2001] to [31 Mar 2002]. This list is also available in another format: alphabetic by variant name.