Event: Atkinson Cup

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Opponent Rating Result
Edward S Oxley 1755 0 - 1
David W Stephenson 1843 0 - 1
David Atkin 1326 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1508 = (4924 + 400 * (1 - 2)) / 3)

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