Event: Division 1

Opponent Rating Result
Ian P Morgan 1782 0 - 1
Adrian Billingsley 1729 0 - 1
Malcolm P Kingsley 1859 1 - 0
David D'Cruz 1386 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1689 = (6756 + 400 * (2 - 2)) / 4)

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