George Duke wrote on Tue, May 22, 2012 01:13 AM UTC:
Cannon/Canon of Jacks & Witches is dual-inclusive,
http://www.chessvariants.org/large.dir/contest84/jacksandwitches84.html, as is Fourriere's Rook/Bishop of Polypiece43, http://www.chessvariants.org/43.dir/pocket-polypiece43.html. Gilman already links Centennial here, and its Rotating Spearman is not only Pivoted but found to be ''Sovereign.''