Event: Open

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Opponent Rating Result
Daniel M Lambourne 2115 1 - 0
John Lee 1646 1 - 0
Daniel M Lambourne 2115 ½ - ½
John Lee 1646 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2181 = (7522 + 400 * (3 - 0)) / 4)

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