def ball_count(cls, ball_tally, strike_tally, pitch_res):
        """
        Ball/Strike counter
        :param ball_tally: Ball telly
        :param strike_tally: Strike telly
        :param pitch_res: pitching result(Retrosheet format)
        :return: ball count, strike count
        """
        b, s = ball_tally, strike_tally
        if pitch_res == "B":
            if ball_tally < 4:
                b += 1
        elif pitch_res == "S" or pitch_res == "C" or pitch_res == "X":
            if strike_tally < 3:
                s += 1
        elif pitch_res == "F":
            if strike_tally < 2:
                s += 1
        return b, s