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Dave McCooey's analysis gives the following maximum forced mates by King and two pieces against a lone King: two Nightriders = 22 moves, Nightrider and Knight = 27 moves, two Knights = 1 move. The third mate is a 'joke' which only happens in those rare endgames with K,N,N against K,P. The ability of the Nightrider to triangulate seems to be the key here.
<p>My suggested Camel-Dabbabah compound can easily triangulate: just make two Camel-leaps followed by a Dababbah-leap back to its starting square. I would hope that two of these pieces, on opposite color squares, can actually force mate. Joining two ancient pieces like this is a common practice. Jean-Louis Cazaux and Peter Aronson use the Ferz-Elephant compound in several variants. Ralph Betza uses the Wazir-Dababbah compound (Woody-Rook) in Chess With Different Armies.