Event: Division 2

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Opponent Rating Result
Ian Dennis 1729 1 - 0
William F Tracey 1561 1 - 0
Tadeusz Tompsett 1709 0 - 1
Jo Carthew 1627 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1657 = (6626 + 400 * (2 - 2)) / 4)

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