Event: 400 League

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Opponent Rating Result
Josephine Woollard 105 0 - 1
Mike Hoyes 80 1 - 0
R (Bob) Lindsay 90 ½ - ½
David J Norris 90 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-9 = (365 + 400 * (1 - 2)) / 4)

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