Event: Div 2 - Weston Trophy

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Opponent Rating Result
Miles T Hemingway 1875 0 - 1
Ken A McIntosh 1804 ½ - ½
Ivan Dunnachie 1857 0 - 1
Phil Griffiths 1837 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1643 = (7373 + 400 * (0 - 2)) / 4)

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