Event: Open

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Opponent Rating Result
Phil Bull 1869 1 - 0
Philip C Maybury 1664 1 - 0
Phil Bull 1869 0 - 1
Philip C Maybury 1664 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1967 = (7066 + 400 * (3 - 1)) / 4)

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