Event: A Division

PDF Excel

Opponent	Rating	Result
Mark Taylor	154	1 - 0
John Addison	134	0 - 1
Dave S Almond	133	1 - 0
Marlon Espiritu	132	½ - ½

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

238 = (553 + 400 * (2 - 1)) / 4)