George Duke wrote on Tue, Nov 23, 2010 05:23 PM UTC:
http://www.chessbase.com/puzzle/puzz03a.htm,
there Loyd's mate in 5 requires the unexpected Pawn to promote to Queen for the task. The Helpmate problem at issue now is whether from the starting array Black Pawn-a7 can deliver mate with no other piece assisting in 9 moves and without promotion -- of course as Helpmate White moves favourably towards the end result.
http://en.wikipedia.org/wiki/Excelsior_(chess_problem)
