Event: Atkinson Cup

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Opponent	Rating	Result
Phil Bawden	1823	1 - 0
John Thackray	1966	1 - 0
Tim M Turner	1884	1 - 0

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

2291 = (5673 + 400 * (3 - 0)) / 3)