Event: Division 2

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Opponent Rating Result
Ben Ellington 1804 0 - 1
John J Grady 1620 1 - 0
Philip Delbridge 1430 0 - 1
Mark LJ Spriggs 1699 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1438 = (6553 + 400 * (1 - 3)) / 4)

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