Event: Division 4

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Opponent Rating Result
Anthony Garrood 430 1 - 0
Harriet Haslehurst 1668 ½ - ½
Mark J Fulleylove 1713 0 - 1
Ian G Berry 1615 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1357 = (5426 + 400 * (1 - 1)) / 4)

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