Event: Division A

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Opponent Rating Result
John H Schofield 148 0 - 1
Paul O'Mara 140 1 - 0
Anthony Oldham 72 0 - 1
Geoffrey Pennington 141 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-75 = (501 + 400 * (1 - 3)) / 4)

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