Event: Open

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Opponent Rating Result
Geoffrey C Wesson 1660 ½ - ½
Andrew Adams 1502 1 - 0
Geoffrey C Wesson 1660 1 - 0
Andrew Adams 1502 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1781 = (6324 + 400 * (2 - 0)) / 4)

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