Event: Grand Prix S2

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Opponent Rating Result
Alan M Willett 890 1 - 0
David Millington 1627 1 - 0
Caroline L Mountford 1603 0 - 1
Charlie G Swinson 1429 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1387 = (5549 + 400 * (2 - 2)) / 4)

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