Event: IM Brown

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Opponent Rating Result
Paul Butterworth 1757 0 - 1
David Kilmartin 1424 1 - 0
Nathan Madzia 1389 ½ - ½
Lucas Gailbraith 1598 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1642 = (6168 + 400 * (2 - 1)) / 4)

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