Event: Division 2

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Opponent Rating Result
Rowan Eccleston 1219 1 - 0
Lewis Sheehy 1135 ½ - ½
Martin Lythgoe 1882 ½ - ½
Bryony Eccleston 1405 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1610 = (5641 + 400 * (2 - 0)) / 4)

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