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Opponent Rating Result
John Grasham 133 ½ - ½
Martin E Newman 119 ½ - ½
Aisha Benhamida 123 0 - 1
Joe Varley 159 0 - 1
Kate Walker 134 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-106 = (668 + 400 * (0 - 3)) / 5)

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