code: def score(self):
          'Return score from B perspective. If W is winning, score is negative.'
          working_board = np.copy(self.board)
          while EMPTY in working_board:
              unassigned_spaces = np.where(working_board == EMPTY)
              c = unassigned_spaces[0][0], unassigned_spaces[1][0]
              territory, borders = find_reached(working_board, c)
              border_colors = set(working_board[b] for b in borders)
              X_border = BLACK in border_colors
              O_border = WHITE in border_colors
              if X_border and not O_border:
                  territory_color = BLACK
              elif O_border and not X_border:
                  territory_color = WHITE
              else:
                  territory_color = UNKNOWN  # dame, or seki
              place_stones(working_board, territory_color, territory)
  
          return np.count_nonzero(working_board == BLACK) - np.count_nonzero(working_board == WHITE) - self.komf score(self):
          'Return score from B perspective. If W is winning, score is negative.'
          working_board = np.copy(self.board)
          while EMPTY in working_board:
              unassigned_spaces = np.where(working_board == EMPTY)
              c = unassigned_spaces[0][0], unassigned_spaces[1][0]
              territory, borders = find_reached(working_board, c)
              border_colors = set(working_board[b] for b in borders)
              X_border = BLACK in border_colors
              O_border = WHITE in border_colors
              if X_border and not O_border:
                  territory_color = BLACK
              elif O_border and not X_border:
                  territory_color = WHITE
              else:
                  territory_color = UNKNOWN  # dame, or seki
              place_stones(working_board, territory_color, territory)
  
          return np.count_nonzero(working_board == BLACK) - np.count_nonzero(working_board == WHITE) - self.komi
docs: Return score from B perspective. If W is winning, score is negative.