Is there a puzzle # ?
Why is this puzzle rated 2000?

Hence the question. This position came up in a puzzle with white to play. Qh8 is mate, I scored +20 and looked up the rating of the puzzle and it was 2000.
Hence the question. This position came up in a puzzle with white to play. Qh8 is mate, I scored +20 and looked up the rating of the puzzle and it was 2000.
[Event "?"]
[Site "Chess.com iPhone"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "3r4/2R2pkp/3pq1p1/8/3Q4/6PP/5P1K/8 b - - 0 0"]
1. Kf8 Qh8# {*}
Why is this puzzle rated 2000?