Event: Division 2

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Opponent Rating Result
Paul Butterworth 1772 0 - 1
Richard Zaidman 1672 0 - 1
Keith Marsh 1726 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1323 = (5170 + 400 * (0 - 3)) / 3)

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