Event: Durham League Division A

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Opponent Rating Result
Dave Patterson 1734 1 - 0
Charlie Hazlerigg 1667 ½ - ½
Richard J Harris 1774 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1858 = (5175 + 400 * (1 - 0)) / 3)

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