Event: Rated club games

Opponent Rating Result
Roy A Ludlow 1584 ½ - ½
Bernadette Marie 1150 1 - 0
Roy A Ludlow 1583 1 - 0
David L Weston 1656 0 - 1
Bernadette Marie 1140 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1583 = (7113 + 400 * (3 - 1)) / 5)

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