Event: Division B

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Opponent Rating Result
William O'Rourke 1880 1 - 0
Peter J Kobryn 1960 ½ - ½
Andrew Crowther 1699 0 - 1
Peter J Kobryn 1960 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1775 = (7499 + 400 * (1 - 2)) / 4)

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