Event: Division 2

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Opponent Rating Result
Andrew Cottom 1709 ½ - ½
Gordon SG Christie 1732 0 - 1
Mike J Johnson 1641 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1427 = (5082 + 400 * (0 - 2)) / 3)

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