Event: Grand Prix S3

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Opponent Rating Result
Simon R Edwards 2054 0 - 1
S Ali Arshad 1167 1 - 0
Joseph P Alcock 1558 0 - 1
Dean Corbishley 1500 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1570 = (6279 + 400 * (2 - 2)) / 4)

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