Event: E Division

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Opponent Rating Result
Bryony Eccleston 1451 1 - 0
Stuart Sumner 1537 ½ - ½
James Morris 1357 1 - 0
Atul Rughani 1500 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1561 = (5845 + 400 * (2 - 1)) / 4)

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