Event: Division 4

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Opponent Rating Result
Ian G Berry 1566 1 - 0
Daniel Seaton 1712 0 - 1
John Bickley 1257 1 - 0
Harriet Haslehurst 1651 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1547 = (6186 + 400 * (2 - 2)) / 4)

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