Event: Atkinson Cup

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Opponent Rating Result
Nick Whetton 1612 1 - 0
Stephen Crow 1840 ½ - ½
N Charles Clayton 1501 1 - 0
Edward S Oxley 1761 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1779 = (6714 + 400 * (2 - 1)) / 4)

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