Event: Div 2 - Weston Trophy

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Opponent Rating Result
Phil Griffiths 1837 0 - 1
John A Clark 1808 0 - 1
David Ashcroft 1810 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1418 = (5455 + 400 * (0 - 3)) / 3)

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