Event: Open

Opponent Rating Result
Phil Bull 157 1 - 0
John E Crump 169 1 - 0
Phil Bull 157 1 - 0
John E Crump 169 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

563 = (652 + 400 * (4 - 0)) / 4)

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