Event: Div4

PDF Excel

Opponent	Rating	Result
Paul Kelman	136	0 - 1
Kieran Redhead	0	0 - 1
Peter Rugg	91	1 - 0
John E Fryer	125	0 - 1
Saurav Sunny	117	½ - ½

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

-66 = (469 + 400 * (1 - 3)) / 5)