Event: Division 4

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Opponent Rating Result
Jonathan Welton 1667 0 - 1
Edward Hargreaves 1668 ½ - ½
Alistair Jennis 1351 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1562 = (4686 + 400 * (1 - 1)) / 3)

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