Event: Bloodworth league

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Opponent Rating Result
Anthony Tatam 102 1 - 0
Robert G Wilby 138 0 - 1
Anthony Tatam 102 1 - 0
Geoffrey Wilson 103 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

311 = (445 + 400 * (3 - 1)) / 4)

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