public void Roll(int pins)
{
frame.Load(pins);
//special rule for last frame
if (frame.Number == maxFrameCount && (frame.IsStrike() || frame.IsSpare()))
{
frame.IncreaseThrowCount();
}
if (frame.IsStrike() || frame.ThrowCount() == frame.ThrowsPerFrame())
{
frame = AddFrames();
}
}