I own a real (instead of virtual) Shogi board.
This board is, one may say, divided in 9 zones by using a simple mean.
There are 4 black dots at the intersections of the
- 'b' and 'c' with the '3' and '4' and '6' and '7';
- 'f' and 'g' with the '3' and '4' and '6' and '7'.

The reason why I ask is that in the fire of action, often I miss to see that my pawns and pieces are in the promote zone. The proposal to promote up the board is good but not sufficient for an absorbed (and therefore distract) player as I.
I think this little add could help. I suppose I am not alone in this case?
Of course a solid black line could be the best but the risk is to hurt the purists?!