Event: Div 4 - Athenaeum Cup

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Opponent Rating Result
Stefan Lewins 1573 0 - 1
Michael W Simmons 1179 1 - 0
Seb Roberts 1180 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1177 = (3932 + 400 * (1 - 2)) / 3)

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