Event: Open Rapid-play

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Opponent Rating Result
Jon Turner 1765 ½ - ½
Gordon SG Christie 1812 ½ - ½
Jon Turner 1765 ½ - ½
Gordon SG Christie 1812 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1889 = (7154 + 400 * (1 - 0)) / 4)

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