Event: A Division

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Opponent Rating Result
Joao Rita 2055 0 - 1
Martin Mitchell 2196 0 - 1
Nicholas MS Barnaby 1945 1 - 0
Andy Laurence Coe 1823 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1905 = (8019 + 400 * (1 - 2)) / 4)

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