Event: A Division

PDF Excel

Opponent	Rating	Result
Adam Jenkins	0	1 - 0
Steven M Flaherty	128	½ - ½
Tim Hilton	171	0 - 1
Tim Hilton	171	0 - 1
John Addison	143	½ - ½

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

43 = (613 + 400 * (1 - 2)) / 5)