Event: Rated club games

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Opponent	Rating	Result
Roy A Ludlow	1633	0 - 1
Christopher Lamming	1753	½ - ½
Ian Threlkeld	1617	1 - 0
William Hargreaves	1778	1 - 0
Bernadette Marie	1091	1 - 0
Roy A Ludlow	1655	1 - 0
Sally Hunt	1364	1 - 0

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

1784 = (10891 + 400 * (5 - 1)) / 7)