Event: Derby Long play

PDF Excel

Opponent	Rating	Result
David Williams	161	0 - 1
Michael Moon	100	1 - 0
Matthew Caswell	120	0 - 1
John Challenor	113	½ - ½
David Smith	153	0 - 1

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

-31 = (647 + 400 * (1 - 3)) / 5)