Event: Grand Prix S7

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Opponent Rating Result
David Millington 1627 0 - 1
Owen Frodsham 1050 1 - 0
S Ali Arshad 1167 1 - 0
David A Hallen 1486 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1533 = (5330 + 400 * (3 - 1)) / 4)

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