public void setTransparencyChessboardBlankColor(Color color) {
    Color oldValue = chessboard.getBlackColor();
    if (oldValue != null && !oldValue.equals(color) || oldValue == null && color != null) {
      chessboard.setBlackColor(color);
      firePropertyChange(TRANSPARENCY_CHESSBOARD_BLACK_COLOR_PROP, oldValue, color);
    }
  }
public void setTransparencyChessboardBlankColor(Color color)