Event: Durham League Division B

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Opponent Rating Result
Jack Gibson 0 ½ - ½
Alan Fell 1425 1 - 0
Andy Proudfoot 1531 0 - 1
Samuel Bradford 0 0 - 1
Sam Ball 1429 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

717 = (4385 + 400 * (1 - 3)) / 5)

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