Event: Grand Prix S7

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Opponent Rating Result
Owen Frodsham 1050 1 - 0
Charlie G Swinson 1429 1 - 0
Simon R Edwards 2054 0 - 1
David E Shiers 1649 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1746 = (6182 + 400 * (3 - 1)) / 4)

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