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http://www.chessvariants.org/index/displaycomment.php?commentid=26784,
http://www.chessvariants.org/index/displaycomment.php?commentid=26783.
Six of th 30 result in: BQ 2 to mate;  WQ 3; B-f1 3; B-f8 3; N-g8 6 to
mate; N-g1 7 to mate. Now a new one, Rook-h8 can mate unassisted by a
fellow in 8 moves from the 500-year-old array RNBQKBNR as follows:
1 e4 d5
2 e4xd5            Qxd5
3 a3 (''waiting'') B c8-g4 
4 b3 (waiting)     B g4-f3
5 g2xf3            Q d5-d3
6 c2xd3            h5
7 K e1-e2          R h8-h6
8 h3 (waiting)     R h6-e6#. Checkmate by Rook alone from standard array.  We can easily generalize in follow-up table to the other Rooks.  How closely Queen-side Bishop and Knight work to the solved King-side cases is yet to determine, but within view. What about Pawns?  In perfect case this problem sub-genre, Pawn can/must be covered by any one piece, unlike when Piece is the candidate checker, but still Pawn must ''unassisted'' complete Mate. Can Pawn-a7 deliver mate unassisted and without promotion and how quickly? Is 10 moves still possible?
[http://www.chessvariants.org/index/displaycomment.php?commentid=26782.
ChessboardMath11 has nearly overflow 25 comments where Helpmates started with the three link-comments.]