Event: Derby Long play

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Opponent Rating Result
John Challenor 113 1 - 0
Adrian J Dibble 88 0 - 1
Michael Moon 100 ½ - ½
Chris Sharp 100 0 - 1
Colin Ross 117 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

24 = (518 + 400 * (1 - 2)) / 5)

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