def add_main_variation(self, move: chess.Move, *, comment: str = "") -> "GameNode":
        """
        Creates a child node with the given attributes and promotes it to the
        main variation.
        """
        node = self.add_variation(move, comment=comment)
        self.variations.remove(node)
        self.variations.insert(0, node)
        return node
def add_main_variation ( self , move : chess . Move , * , comment : str = "" ) -> "GameNode" : node = self . add_variation ( move , comment = comment ) self . variations . remove ( node ) self . variations . insert ( 0 , node ) return node
Creates a child node with the given attributes and promotes it to the
        main variation.