Event: Grand Prix S7

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Opponent Rating Result
David E Shiers 1649 1 - 0
Dean Corbishley 1500 0 - 1
David Millington 1627 1 - 0
Simon R Edwards 2054 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1708 = (6830 + 400 * (2 - 2)) / 4)

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