Event: Rated club games

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Opponent	Rating	Result
Wieslaw Stanicki	1462	0 - 1
David L Weston	1740	1 - 0
Ian Threlkeld	1633	0 - 1
Sally Hunt	1378	1 - 0
Ian Threlkeld	1612	1 - 0
Ian Threlkeld	1609	½ - ½
David L Weston	1677	0 - 1

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

1587 = (11111 + 400 * (3 - 3)) / 7)