Event: Division 2

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Opponent Rating Result
Michael WA Hoare 1609 ½ - ½
David J Friend 1609 0 - 1
Sam Duffield 1235 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1218 = (4453 + 400 * (0 - 2)) / 3)

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