Event: Doncaster League

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Opponent Rating Result
Iain H Forsyth 94 0 - 1
Hugh A Jones 101 1 - 0
Alan J Smith 111 0 - 1
Alan Taylor 100 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-99 = (406 + 400 * (1 - 3)) / 4)

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