Event: Division One

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Opponent Rating Result
David M Cooper 171 0 - 1
John L Emanuel 174 ½ - ½
Jonathan Dale 155 1 - 0
Richard Mycroft 184 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

171 = (684 + 400 * (1 - 1)) / 4)

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