Event: Division 3

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Opponent Rating Result
Mike J Groombridge 1640 1 - 0
John Grant 1654 ½ - ½
Joe Hardy 1478 1 - 0
Peter J R Oliver 1560 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1783 = (6332 + 400 * (2 - 0)) / 4)

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