The part that is - surprisingly computationally complicated - and I can't stress this enough, is ensuring that previous years' matches don't re-match. When you

The part that is - surprisingly computationally complicated - and I can't stress this enough, is ensuring that previous years' matches don't re-match. When you add more people and more years, it turns into a bloody mess to a point of engines throwing hissy fits. Run the numbers, be surprised.