Event: Spring League 1`

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Opponent Rating Result
Josh Blackmore 0 ½ - ½
George A Darling 0 0 - 1
Alan Brusey 0 0 - 1
Paul J Brooks 0 ½ - ½
Trefor Thynne 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-80 = (0 + 400 * (1 - 2)) / 5)

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