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I've come up with a series of simple formulas with which one can, in my
opinion, more easily determine whether or not ones Rose may take other
pieces, or, obviously, if an opposing Rose threatens ones own pieces. I
find that these formulas help prevent me from having to repeatedly trace
a
Roses path with the mouse cursor around the board, since the Rose is, at
least for me, such a difficult piece to visualize without resorting to
tracing, tracing, and tracing, ad nauseum. Knowing these numbers makes
the
job of finding 'quarry' for a Rose a simple matter of counting
squares. I do realize that it is likely that many of the players on this
site are already intuitively aware of these relationships, and, for them,
these numbers are redundant. But, for a player like me, and possibly
others...

 A Rose may capture a piece, provided that it's not blocked at any
landing
point, if it is in the following relationship, square-wise, with a
hostile
piece:
 -- 1 Knight's move away (Duh!).
 --3 or 4 squares away, diagonally. 
 --5+2 squares away, (or, put another way, at the opposite corner of a  
   3 x 6 rectangle).
 --4 or 6 squares away. orthogonally.

  Hopefully, I am not just repeating information someone else has already
contributed!  I did a search for this topic, and found nothing, though,
please let me know if I am mistaken.