Event: Croydon Shield

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Opponent Rating Result
Ian L Snape 2161 0 - 1
Mike Roberts 2080 ½ - ½
John P Allen 1915 0 - 1
John E Duggan 2167 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1881 = (8323 + 400 * (0 - 2)) / 4)

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