Event: County Championship

PDF Excel

Opponent	Rating	Result
Ian McDonald	0	0 - 1
Peter G Sherlock	0	0 - 1
Andrew T Watson	0	0 - 1
Bernard Pratten	0	0 - 1

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

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