Event: Grand Prix 1

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Opponent	Rating	Result
William H Luxton	1612	0 - 1
John D Kimber	1445	0 - 1
Edward Booth	0	0 - 1

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

619 = (3057 + 400 * (0 - 3)) / 3)