if keyboard_check(ord('A')) {
    n = instance_place(x - 1, y, o_box);
    if n == noone {
       if place_free(x - 4, y) x -= 4;
    } else {
       with n {
          if place_free(x - 4, y) {
             x -= 4;
             other.x -= 4;
          }
       }
    }  
}