Event: Rated club games

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Opponent Rating Result
Roy A Ludlow 1650 1 - 0
David L Weston 1649 ½ - ½
Roy A Ludlow 1653 1 - 0
David L Weston 1667 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1755 = (6619 + 400 * (2 - 1)) / 4)

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