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I start ''Piece-types'' first of all to look at Hoppers. There is incredibly nothing in CVPage on ''Hoppers,'' surprisingly nothing at all. Jeliss here has: Auto-hopper, Contra-hopper, Equihopper, Fore-hopper, Step-hopper, Line-hopper, Oppo-hopper, Leaper-hopper, L-hopper, Overhopper, Rider-hopper. You can see ''Equihopper'' and ''Overhopper'' are regulars -- therefore needing no hyphenation any more. The two already were become part of the established usage and vocabulary mid-20th Century among serious variant problemists. It was a time when conscientious and respectful contemplation of the Heterodox dictated quality and polite forbearance from anything unnecessarily weird. Credits were duly accorded for good ideas, and inventors duly accepted corrections as to priority with aplomb. That someone else got there first just satisfied, as it ought, one's assurance that, hey, great minds can sometimes think alike. None of today's re-inventing the wheel, even ridiculously 50 or 80 years after first implementation. Now all of the above are (sub-)categories of Hopper as piece-type, and none of them in and of themselves yet identifying any actual specific pieces in their mere naming. Some actual variant pieces, pursuant to the categories (and subcategories) within family of Hoppers -- besides Cannon (in part) and Grasshopper -- being very brief, are Moo-hopper, Moa-hopper, Rook-hopper, Knight-hopper. Hey again, certain Knight-Hopper and Nightrider cells indeed overlap in their differing modalities! If you cannot get there one way, there may be another way, in the manner of the very other piece of these two.