Event: OTB RuleOf6-13Jul-A

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Opponent Rating Result
Ian D Hunnable 2014 0 - 1
John Cawdery 2000 0 - 1
Mark RA Murrell 1960 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1858 = (5974 + 400 * (1 - 2)) / 3)

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