Event: Mini League

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Opponent Rating Result
Edward Rivlin 1332 0 - 1
Simon Bartle 1141 1 - 0
Pete Brennan 1493 0 - 1
Tom Devlin 1583 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1187 = (5549 + 400 * (1 - 3)) / 4)

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