def __init__(self, board = None, parent = None):
super(QWidget, self).__init__()
policy = QSizePolicy(QSizePolicy.Preferred, QSizePolicy.Preferred)
self.setSizePolicy(policy)
if(board == None):
board = Bitboard()
board.castling_rights = CASTLING_NONE
self.board = board
self.parent = parent
self.borderWidth = 12
self.pieceImages = PieceImages()
self.selected_xy = None
self.pcs = [['P','R','B','N','Q','K'],['p','r','b','n','q','k']]
self.initUI()
