Event: C Division

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Opponent Rating Result
Graham R Marshall 1352 0 - 1
Joseph Dodds 1250 0 - 1
Rosie Irwin 1266 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1156 = (3868 + 400 * (1 - 2)) / 3)

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