Event: Div1

PDF Excel

Opponent	Rating	Result
Geoffrey D Brown	150	½ - ½
David Williams	165	0 - 1
Andrew J Mort	160	0 - 1
Derek A Jarvis	168	0 - 1

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

-139 = (643 + 400 * (0 - 3)) / 4)