None attacked to All attacked

Here is what I found to answer this challenge. It features a wK move.

Originally posted by Fat Lady
Unfortunately this doesn't quite comply with part A - "White is attacking NONE of black's 16 pieces".

However move Black's b7 bishop along to a7 and plonk a White rook onto h7 and you've got rid of the horrible pawn I had to add.

Ahh, right.

That's what I did at first - shifted the position to get rid of that annoying P - but then I got greedy and tried to pull the Rook too.