Here's a "simple" task for all of you solvers out there: With White to play first, and with both sides working together to checkmate White, aka a helpmate, what is the quickest way for Black to checkmate White?
All normal rules of chess apply. The Black pawn on Black's first rank moves and promotes like a normal Black pawn. However, it is not allowed to have a double-step on it's first move. It moves down the board.
UPDATE: Just for fun, here is a slight variation of my main puzzle that should definitely take longer to complete. How many moves can you complete it in?