Event: Division 2

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Opponent Rating Result
Dejan Lekic 1693 1 - 0
Anh Nguyen 1823 0 - 1
Ian Goodyer 1555 0 - 1
Ian K Edgson 1703 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1594 = (6774 + 400 * (1 - 2)) / 4)

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