Event: All Play All

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Opponent Rating Result
Robin J Cubbon 1072 0 - 1
Michael Williams 1404 ½ - ½
Steve K Dean 1822 0 - 1
William F Harris 1590 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1172 = (5888 + 400 * (0 - 3)) / 4)

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