Event: A Division

PDF Excel

Opponent	Rating	Result
William O'Rourke	154	0 - 1
James Carrington	151	½ - ½
Mark Taylor	153	1 - 0
Armand Catz	169	0 - 1

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

57 = (627 + 400 * (1 - 2)) / 4)