Event: Rated club games

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Opponent	Rating	Result
Sally Hunt	1369	1 - 0
Wieslaw Stanicki	1469	0 - 1
Wieslaw Stanicki	1480	0 - 1
Katie Campbell	1275	1 - 0
Katie Campbell	1275	1 - 0
Adam Hoskins	1777	1 - 0
Adam Hoskins	1508	0 - 1
Adam Hoskins	1515	0 - 1

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

1459 = (11668 + 400 * (4 - 4)) / 8)