Event: Div3

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Opponent Rating Result
Alex Bentley 156 0 - 1
Sam Clayton 119 1 - 0
Nigel Wright 128 ½ - ½
John Challenor 112 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

229 = (515 + 400 * (2 - 1)) / 4)

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