Event: Open

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Opponent Rating Result
Christopher D Lewis 1862 0 - 1
Jonathan Dale 1893 ½ - ½
Roy A Lawrence 1713 1 - 0
Christopher D Lewis 1862 ½ - ½
Jonathan Dale 1893 0 - 1
Roy A Lawrence 1713 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1823 = (10936 + 400 * (2 - 2)) / 6)

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