Event: Division 4

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Opponent Rating Result
Ian G Berry 1614 ½ - ½
Ian G Berry 1614 ½ - ½
Harriet Haslehurst 1646 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1491 = (4874 + 400 * (0 - 1)) / 3)

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