Event: MID County / Lewis Cup

PDF Excel

Opponent	Rating	Result
David J Shire	169	0 - 1
Steve Marsland	170	0 - 1
John B Atherton	163	½ - ½
Marc A Bryant	136	0 - 1
Andrew C Waters	158	0 - 1
Jerry Anstead	164	0 - 1
Chris Marshall	151	1 - 0

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

-70 = (1111 + 400 * (1 - 5)) / 7)