Event: Club Championship

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Opponent Rating Result
Harvey Gannon 1250 1 - 0
Harvey Gannon 1250 ½ - ½
Ralph McConaghey 1100 1 - 0
Drew Lawrence 1300 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1325 = (4900 + 400 * (2 - 1)) / 4)

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