Event: Div1

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Opponent Rating Result
Daniel JS Sullivan 180 0 - 1
David Williams 165 0 - 1
Anthony J Green 171 ½ - ½
Mike Alcock 173 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

72 = (689 + 400 * (1 - 2)) / 4)

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