Event: Rated club games

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Opponent Rating Result
Roy A Ludlow 1643 ½ - ½
David L Weston 1667 1 - 0
David L Weston 1726 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1679 = (5036 + 400 * (1 - 1)) / 3)

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