Event: Friendly Rapid

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Opponent Rating Result
Jack Shewring 1353 0 - 1
Robert Mills 1192 1 - 0
Rene Butler 1341 0 - 1
David P Holmes 1431 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1129 = (5317 + 400 * (1 - 3)) / 4)

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