A little puzzle game

Try to make a legal position where white just ckeckmate black with the most possible legal amount of points between black and white (black being the 'richer') with 3 rules:
-the black king can't be in a corner
-there must be a move that deliver the checkmate so that previous position must be legal too.
-no black piece can be placed in a square with number 1, 2 or 3 or with letter e, f, g or h (which makes the checker very small)

I wonder if you find the same solution as I do or not and how many there are.
I'm not sure if there can be spoiler tag here but I will try.

I managed to find one changing the rule
-the black king can't be in a corner
with
-the black king can't be near a border
It was really hard and I'm not sure they are lots of solutions.

Is this actually difficult?

Sorry I should have also mentionned that the white pieces should not be outside that limit also.

@MrPushwood said in #6:
> Is this actually difficult?
Since it's doable it's not extremely hard but it's not easy either IMO. At the very least it's fun.
So after more reflexion about this little puzzle the rules mentionned should have been:
Try to make a legal position where white just ckeckmate black with the most possible legal amount of points between black and white (black being the 'richer') with 3 rules:
-the black king can't be near a border
-there must be a move that deliver the checkmate so that previous position must be legal too.
-no black or white piece can be placed in a square with number 1, 2 or 3 or with letter e, f, g or h, not even in the previous position of the checkmate (which makes the checker very small)

I'm sorry but if some admin could please delete this thread or edit the first post with the proper rules that would be nice.