Event: Division 1

Opponent Rating Result
Stephen Middleton 0 1 - 0
Michael J Saunders 1777 1 - 0
Leslie J Crane 1855 ½ - ½
Kerry M Chilvers 1923 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1589 = (5555 + 400 * (2 - 0)) / 4)

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