Event: Division One

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Opponent Rating Result
Simon A Williams 166 1 - 0
Richard W Smith 166 ½ - ½
Iain Brodie 158 1 - 0
Vamsi K Pratapa 121 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

453 = (611 + 400 * (3 - 0)) / 4)

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