Event: Winter Online

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Opponent Rating Result
Mark E Whalley 1712 0 - 1
Mark E Whalley 1712 0 - 1
Billy Molloy 1357 1 - 0
Billy Molloy 1357 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1435 = (6138 + 400 * (1 - 2)) / 4)

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