Event: Rosser Rapid

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Opponent Rating Result
Andrew P Willoughby 1620 1 - 0
Colin L Ellis 1371 1 - 0
Christopher Willoughby 1782 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1858 = (4773 + 400 * (2 - 0)) / 3)

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