Event: Grand Prix S10

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Opponent	Rating	Result
Joseph P Alcock	1558	0 - 1
Raymond G Evans	0	0 - 1
Esme A Shiers	1000	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

719 = (2558 + 400 * (1 - 2)) / 3)