Event: County Championship

PDF Excel

Opponent	Rating	Result
Nicholas Lees	0	0 - 1
Jimmy Blair	0	0 - 1
Piotr Kaszynski	0	0 - 1
John Grasham	0	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-400 = (0 + 400 * (0 - 4)) / 4)