Event: Open

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Opponent Rating Result
Henrik Stepanyan 2360 ½ - ½
Dave M Davies 1848 0 - 1
Henrik Stepanyan 2360 0 - 1
Dave M Davies 1848 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1904 = (8416 + 400 * (0 - 2)) / 4)

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