Event: Group A

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Opponent Rating Result
Mike J Barnett 0 0 - 1
Dave Colledge 0 1 - 0
Elliot Fynn 0 1 - 0
Dave Gray 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

100 = (0 + 400 * (2 - 1)) / 4)

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