The problem is a “Miniature” since has no-more than 7 pieces.
Also it is “Aristocratic” since it lacks Pawns.
The theme of the problem was set in the composition contest "Jubilee Tourney Moutecidis-75", 2005-2006 : [Selfmates in 8 to 20 moves. All the white and black pieces move in the course of the solution. White pieces only, can also be captured, instead of moving.]
Dedication : "Manolas-60"
Selfmate in 18 moves.
s#18 (5 + 2)
White plays and forces Black to mate in eighteen moves. In the problem appears the [Moutecidis-mate] (which will be given by the black Rook, as is evident from the diagram).
The solution has one variation, where the bK makes a long journey with forced moves.
The readers may attempt to solve the problem without seeing the solution, which is written at the end of this post.
Hint : The key is not checking. Castling is allowed.
Solution of the problem 470, by Moutecidis Pavlos:
Key : 1.Be4! zugzwang.
1...Kg1 2.0-0-0+ Kh2 3.Bf5 Kg2 4.Qf1+ Kh2 5.Qe2+ Rg2
6.Qe5+ Rg3 7.Se4 Kg2 8.Qb2+ Kf3 9.Rf1+ Ke3 10.Qf2+ Kd3
11.Rd1+ Kc4 12.Qc5+ Kb3 13.Be6+ Ka4 14.Bd7+ Kb3 15.Sd2+ Ka2
16.Qa5+ Ra3 17.Be6+ Ka1 18.Qc3+ Rxc3# (Moutecidis-mate)