George Duke wrote on Mon, May 21, 2012 02:45 PM EDT:
Good choices, Charles, hoping to add to this specific suggestions before long of still other
categories excluded for multi-path and separately for contingency pieces.
One of the latter would be Ultima Coordinator you have not done. Contingency
p-ts also include those moving on certain turns, or with certain check
conditions, or like the General Staff in Novo Chess. Actually also, Prichard in Introduction to the first 'ECV' mentions there are tens of thousands of coordinate pieces. Pritchard uses the number 100,000 before the Internet came into being. Abbott's Coordinator would cross-categorize there too, and it's time to subdivide all three classes above, coordinate, contigency, and multi-path for widening nomenclature. I think not one example of those three piece-type subclasses appears in the year 2011 Guide either. They can be not itemized but systematized to some thousand p-ts by name-suffixes and -prefixes alone built onto the body of regular pieces, Wazir and Ferz, Bishop and Rook, then all the oblique ones.