Since the 1st of July 2014 a game is automatically drawn (without
        a claim by one of the players) if a position occurs for the fifth time.
        Originally this had to occur on consecutive alternating moves, but
        this has since been revised.

def is_fivefold_repetition(self) -> bool:
        """
        Since the 1st of July 2014 a game is automatically drawn (without
        a claim by one of the players) if a position occurs for the fifth time.
        Originally this had to occur on consecutive alternating moves, but
        this has since been revised.
        """
        transposition_key = self._transposition_key()
        repetitions = 1
        switchyard = []

        while self.move_stack and repetitions < 5:
            move = self.pop()
            switchyard.append(move)

            if self.is_irreversible(move):
                break

            if self._transposition_key() == transposition_key:
                repetitions += 1

        while switchyard:
            self.push(switchyard.pop())

        return repetitions >= 5