Tony Paletta wrote on Thu, Sep 18, 2003 04:02 AM UTC:
Yes. King and 'Cardinal' can mate lone King: On an 8x8 board the
checkmate takes 17 or fewer moves.
See http://www.chessvariants.com/misc.dir/endgames.html
(Analysis by Dave McCooey, who refers to the B+N as a 'Pegasus'.)