Event: Margate 100

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Opponent Rating Result
Leon A Garfield 102 0 - 1
Rhyannon Hanbury 0 1 - 0
Colin G Gregory 118 0 - 1
John L Clarke 98 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-121 = (318 + 400 * (1 - 3)) / 4)

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