Event: Grand Prix S10

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Opponent Rating Result
Howard Spencer 850 1 - 0
Joe Spencer 850 1 - 0
Benjamin R Shiers 1450 0 - 1
David A Hallen 1486 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1359 = (4636 + 400 * (3 - 1)) / 4)

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