Normal chess rules apply, except that one or both of the chess players uses one of Ralph Betza's "Chess with Different Armies" sets rather than a standard FIDE set (for a description, see
http://www.chessvariants.com/d.betza/chessvar/dan/colclob.html and nearby pages).
Originally proposed by AndrewSchoonmaker; never actually been played. Probably we should familiarize ourselves with the movement capabilities of the various pieces before attempting it.