Event: IM Brown Shield

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Opponent Rating Result
Oliver Graham 1826 1 - 0
Richard Porter 1852 0 - 1
Vivien Webster 1697 0 - 1
Paul Gelder 1564 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1535 = (6939 + 400 * (1 - 3)) / 4)

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