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On account of ongoing revisions per suggestions, years 2006-2012 M&Bxxs  to some extent belong to all.  There is no piece category yet for innovative Bent Hero and Shaman, http://www.chessvariants.org/index/msdisplay.php?itemid=MSlemurianshatra.   Year 2011 ''Concise Guide...,'' for example, includes Double Pieces, who require two legs of same type per turn.  That would be strict subclass of Sequential, and Joyce's brilliancies are implicated *Optional Sequential* p-ts.  However the distinct categories happen to overlap among several that are related, there are thousands upon thousands newly to name, given these general plural Movers for generating piece-types. Some equivalent to M&B30 to M&B39 could be devoted to PLURAL/SEQUENTIAL/DOUBLE piece-type super-Class. They of inventive Joyce are that important as effective avenue to the higher boards. 
____________That is, play on 16x16 256, the lower bound of extremely large, is enhanced by preserving elemental units.  In fact, 256-square embodiments to date deleteriously over-stress long-rangers. On 256 squares Dabbabah is dwarfed but 'Dabbabah + Dabbabah + Dabbabah optional third leg' very effective minor piece. Note like Hero and Shaman there is change of direction. 'D+D+D-optional' can go up to six squares and cross the 16x16 in three with room to spare.  To name it, 'DaDaDay' is that piece-type by reduplicative modus operandi, http://en.wikipedia.org/wiki/Reduplication.  In DaDaDay 'y' suffix means optional final leg, because the 'io' in optional is 'y' by sound. Doubling or tripling syllable or word connotes the move itself within nomenclature for the Class Sequential. So any optional final leg to arrival square ends in '-Y', else if enforced for a given p-t no 'Y': the latter DaDaDa or meaning the same thing descriptive 'DaDaDabbabah', also a grammatical reduplication (mathematical iteration). This is unexplored Gilman territory and Betza funny notation is too truncated to see it. Two distinct types then so far: DaDaDa and DaDaDay, and both cling to the root Dabbabah. When the legs are different, it is now inconvenient to use both roots (Gilman excepted) in that there are many suitable reduplications to draw on and devise for these all new unnamed p-ts of different-sequed movements. English-only examples: rolly polly, howdy doody, willy nilly, gooble gobble, boogie woogie, Duke of York, wig wam. This way every reduplication whatever language could become CV jargon as needed since sequential p-ts are more or less inexhaustible.  Over time the feedback loop becomes homeostatic two-way: any linguistic become CV or type and any CV-invention recharging whatever and however many languages far removed.