public void setTransparencyChessboardWhiteColor(Color color) {
    Color oldValue = chessboard.getWhiteColor();
    if (oldValue != null && !oldValue.equals(color) || oldValue == null && color != null) {
      chessboard.setWhiteColor(color);
      firePropertyChange(TRANSPARENCY_CHESSBOARD_WHITE_COLOR_PROP, oldValue, color);
    }
  }
public void setTransparencyChessboardWhiteColor(Color color)