Since... 1994!

Chase the King and mate in 7 or 8 moves

There is also a more spectacular mate in 8 moves, with last move being O-O-O!#

(White: Ke1, Qh5, Ra1, Rh1, Ne4, Ne5, Bd3, a2, b2, c2, d4, f2, g2, h2. Black: Kg8, Qe7, Ra8, Rf8, Nb8, Bb7, Bf6, a7, b6, c7, d7, e6, g7, h7.)

White moves and mate in 7 or 8 moves

Solution for mate in 7 or mate in 8 moves