Event: Division 1

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Opponent Rating Result
Mark Lyell 0 0 - 1
Andrew M Stone 2160 0 - 1
Djuna L Tree 1725 1 - 0
Peter R Wood 1925 0 - 1
John S Walton 1751 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1432 = (7561 + 400 * (2 - 3)) / 5)

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