Event: Division 1

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Opponent Rating Result
Stephen W Ruthen 1917 1 - 0
Stephen W Ruthen 1904 0 - 1
Angus Irving 1759 0 - 1
Laurence Rigley 1500 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1770 = (7080 + 400 * (2 - 2)) / 4)

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