Event: Division Four

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Opponent	Rating	Result
Joshua Skyrme	1269	0 - 1
Barry Knee	1414	0 - 1
Dinesh Patel	1000	1 - 0
Andrew Powell	1490	0 - 1
Lennie Johnson	1593	0(def) - 1
Andrei Artemov	1360	1 - 0
Jon A Asbury	1568	0 - 1
Anthony Rimmington	1534	0 - 1
Thomas Sanderson	1358	0 - 1
Shane Cooksey	1477	0 - 1

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

1163 = (12470 + 400 * (2 - 7)) / 9)