Event: Division 4

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Opponent Rating Result
Faye Ainscow 1625 0 - 1
David C Helsby 1751 0 - 1
Robin Lee 1461 1 - 0
Michael Gilyatt 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1209 = (4837 + 400 * (2 - 2)) / 4)

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