Since... 1994!

9. Chase the Black King and mate in 6 moves (10 chesscoins)

White's last move was d:Be6 and Black took the white Queen with N:Qb3. How would White revenge for their Queen?

(White: Kg1, Ra1, Re1, Ba3, Bc4, Nb1, Nf3, a2, c3, e6, f2, g2, h2. Black: Ke8, Qd8, Ra8, Rh8, Bb6, Nb3, Nf6, a7, b7, c7, d4, f7, g7, h7.)

White moves and mate in 6