Event: Grand Prix S4

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Opponent	Rating	Result
Dean Corbishley	1500	0 - 1
David A Hallen	1486	0 - 1
Chris Ellis	1200	1 - 0

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

1262 = (4186 + 400 * (1 - 2)) / 3)