public GoColor getLabelColor(int x_sect, int y_sect) {
    GoStone toFind = null;
    for (GoStone stone: goStones) {
      if (stone.x_sect == x_sect && stone.y_sect == y_sect) {
        toFind = stone;
      }
    }
    if (toFind == null) {
      return GoColor.BLACK;
    } else {
      return toFind.color.opposite();
    }
  }