Event: Division 5

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Opponent Rating Result
David Hackney 68 0 - 1
Isabelle M Rose 70 ½ - ½
Martin J Chadwick 74 0 - 1
Simon Haas 50 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-35 = (262 + 400 * (1 - 2)) / 4)

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