Since... 1994!

17. Find mate in 7 moves (9 chesscoins)

(White: Kg1, Qd2, Re4, Nf5, Bb1, c4, f2, g2, h3. Black: Kg8, Qd8, Re8, Nc6, Bb4, Bb7, d4, d6, f7, g7, h7.)

White moves and mate in 7