George Duke wrote on Tue, Aug 3, 2010 03:30 PM UTC:
Like Bland Chess, ''Bishops are immobile'' in Frolov's subvariant of Monochromatic Chess from an article,
http://www.chessvariants.org/index/displaycomment.php?commentid=26049. The reasons are different though overlapping: the Black brothers' Bland for no diagonal allowed, reverse Monochromatic for the required colour-switching Frolov describes. In reverse Monochromatic, Pawns can never use their f.i.d.e. two-step, which is too much trouble for them to delete official rules.