Event: Division 3

Opponent Rating Result
Alexander Roberts 1805 0 - 1
Nigel Morris 1536 0 - 1
Chris W Pitt 1646 1 - 0
Richard Buxton 1457 ½ - ½
Jon A Asbury 1537 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1516 = (7981 + 400 * (1 - 2)) / 5)

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