Event: Division 1

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Opponent Rating Result
David L Haydon 2361 0 - 1
Michael St J Brown 1976 0 - 1
Jake Stones 1808 ½ - ½
Daniel Potter 1647 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1648 = (7792 + 400 * (0 - 3)) / 4)

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