Event: Division 3 - Under 6400

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Opponent Rating Result
Piotr Ruszelak 1784 ½ - ½
Piotr Ruszelak 1784 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1584 = (3568 + 400 * (0 - 1)) / 2)

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