protected override void OnClosing(CancelEventArgs e)
{
m_chessFacade.BoardChanged -= HandleBoardChangedEvent;
m_chessFacade.WhitePawnPromoted -= HandleWhitePawnPromotedEvent;
m_chessFacade.BlackPawnPromoted -= HandleBlackPawnPromotedEvent;
m_chessFacade.StatusInfo -= HandleStateChangedEvent;
m_chessFacade.WhiteClockNotifier -= HandleWhiteTimeEvent;
m_chessFacade.BlackClockNotifier -= HandleBlackTimeEvent;
OutputWriter.WriteOutput -= HandleWriteOutput;
m_chessFacade.Quit();
base.OnClosing(e);
}