Event: Division Four

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Opponent Rating Result
Mike Nevin 110 0 - 1
Rich Wiltshir 144 0 - 1
Michael WA Hoare 129 0 - 1
Mike J Groombridge 127 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-173 = (510 + 400 * (0 - 3)) / 4)

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