wall Blocking System

Hi all!!

need your help...
I'm making a final project that needs your help ... I have a tactics movement setup for my player which allows the player to move 1 block in any direction except diagonal but I'm stuck with 2 things is I'm not able to make a win condition using box trigger because of my half extents ( used in code ) and another thing is my player will place wall to stop opponent move but whichever side the wall is the player should not move that side...

if you guys know how to do this please help.
(I'm attaching the files with this thread.)
(Please help)