Event: Rated club games

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Opponent Rating Result
Roy A Ludlow 1641 1 - 0
David L Weston 1705 0 - 1
Roy A Ludlow 1621 0 - 1
Roy A Ludlow 1621 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1547 = (6588 + 400 * (1 - 2)) / 4)

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