Event: Division 4

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Opponent Rating Result
Liam Ireland 1688 ½ - ½
Harriet Haslehurst 1646 1 - 0
Antony Pugh 1333 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1822 = (4667 + 400 * (2 - 0)) / 3)

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