Event: Grand Prix S5

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Opponent Rating Result
Joseph P Alcock 1558 0 - 1
Esme A Shiers 1000 1 - 0
Benjamin R Shiers 1450 0 - 1
David E Shiers 1649 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1214 = (5657 + 400 * (1 - 3)) / 4)

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