Event: Division 1

Opponent Rating Result
Richard R Welford 1976 0 - 1
James C Mansson 2112 0 - 1
Paul J Carpenter 1855 1 - 0
D Ian Calvert 1993 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1784 = (7936 + 400 * (1 - 3)) / 4)

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