Event: Hillingdon Div X

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Opponent Rating Result
Leon Zdunek 0 ½ - ½
Harriet Cann 451 1 - 0
Harshathan Devanathan 1182 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

811 = (1633 + 400 * (2 - 0)) / 3)

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