S-chess deserves sub-genre status now established by these comments since 28.October.2011. Other CV sub-genres include year-1961 Ultima copycats and offshoots, year-1617 Carrera improvements on 8x10 and 10x10, Shogi revisions, Xiangqi revisions or look-alikes, and Mutator plural-move CVs -- to name five other examples. Now S-chess criteria are twofold in first back-rank drop and, second, array RNBQK permutated flexibly. The only one embodiment in Seirawan's write-up here is extendable by changing the reserve pieces to better ones, enlarging the board, or allowing more than one square to drop. Those three factors in combinations become thousands of CV sub-variants for thought experiments within this subgenre. In general, S-chesses are very able to introduce trouble-free new piece-types on familiar 8x8 or enlarged 8x10 preferentially, such as Bifurcators from the mid-aughts, year 1992 Falcon, Bent Hero and Bent Shaman of year 2006. Easily a thousand and more other piece-types, half developed since year 2000, are possible to bring on board post-move-one the same S-chess manner. Daunting but attainable is task to continue winnowing across subgenres those all inventive piece-types to just a few and also an auxiliary surrounding group of novelty 50 or 100 of the best cv p-ts to date. But is the S-Chess technique better than other placement techniques? Alternative_ Chess and Accessory_Chess, require instead the drop behind a Pawn to rank 2. Next question can be to compare the two, S-chesses and A-chesses, as to mechanism and effect. One or the other selected and justified, ideally, would exclude the competing idea most purposes. Designers should be able agree on an answer -- Rank 1 versus Rank 2 (or 3) at issue here. The same way problem-themes settle ''Which is the best move?'' to one right answer. Or cautiously would there be something else instead in carefully-selected hybrid? Basically, is it A-chess or is it S-chess?