This problem was composed by Giegold in 1976.
White to play and mate in six.
The solution is more or less self-explanatory. Black is stalemated apart from his d-pawn, so White has two free moves before he has to worry about releasing the stalemate. On the other hand, it is hard to envisage a mating position since Black's king is virtually surrounded by his own pieces.
The key idea is to leave the rook on f6 undefended at the right moment, forcing ...Kxf6, and then mate with the bishop along the long diagonal. The problem is that in the diagram the bishop has no useful moves because the four enemy pawns on the queenside prevent the bishop moving to d6, c5 or b4.
6 Bb2 mate.
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