Event: Atkinson Cup

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Opponent	Rating	Result
John Thackray	155	½ - ½
Alec Grice	138	0 - 1
Tsaone Majuta	155	0 - 1

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

-117 = (448 + 400 * (0 - 2)) / 3)