Event: Spring League 1`

PDF Excel

Opponent	Rating	Result
Alan Brusey	0	0 - 1
Paul J Brooks	0	½ - ½
George A Darling	0	0 - 1
Josh Blackmore	0	0 - 1
Trefor Thynne	0	0 - 1

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

-320 = (0 + 400 * (0 - 4)) / 5)