Event: Grand Prix S2

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Opponent Rating Result
Dean Corbishley 1500 0 - 1
Ewan F Corden 1277 1 - 0
Chris Ellis 1200 0 - 1
Rowan J Webb 1375 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1138 = (5352 + 400 * (1 - 3)) / 4)

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