code: def click_field(self, move_x, move_y):
          
          field_status = self.info_map[move_y, move_x]
  
          # can only click blank region
          if field_status == 11:
              if self.mine_map[move_y, move_x] == 1:
                  self.info_map[move_y, move_x] = 12
              else:
                  # discover the region.
                  self.discover_region(move_x, move_y)
docs: Click one grid by given position.