I did it.
Solve the puzzle!

Ok, @Utkarsh_5188.
I was a little busy so I was inactive.
The next puzzle is one of the hardest I have ever seen.
Find the Black King!
It is mate in 1 for white.
But where is the black king?

The puzzle is from White's perspective.
Write the coordinates of the king and the mate in 1.
There is more than 1 solution for the king's coordinates and the mate-in-1.
Format: Write all the possible coordinates of the king first.
Then, find the coordinates of the king where it can be checkmate in 1 move.
Then, write the move.
Make sure you write the move that is repeated if there is a move that is repeated.
Here is today's weekly puzzle...
Solve it before the week is completed!
(Before Feb 24, 4:49 PM IST)