If I understand correctly it is not possible to hide behind wall. In situation.
[w][w][w][w]
[_][_][A][w][w][w][w][w][w][w][w]
[_][_][_][_][_][_][_][_][_][_][B]
[_][_][_][_][_][_][_][_][D][_][_]
[_][_][C][w][w][w][w][w][w][w][w]
[w][w][w][w]
I undestand D can see A and C and fire on them ??
D can fire form left up to both A (down left + right) and C (up left + right) ??
Edited by gural