// Return a list of individual frame scores.
    public static List<int> ScoreFrames(List<int> rolls)
    {
        List<int> frameList = new List<int>();
        for (int i = 2; i <= rolls.Count && frameList.Count <= 9; i += 2)
            if (rolls[i - 2] == 10 || rolls[i - 2] + rolls[i - 1] == 10) {
                if (i < rolls.Count)
                    frameList.Add(rolls[i - 2] + rolls[i - 1] + rolls[i]);
                    i -= rolls[i - 2] / 10;
            } else
                frameList.Add(rolls[i - 2] + rolls[i - 1]);
        return frameList;
    }