Event: Croydon Shield

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Opponent Rating Result
Ian L Snape 2204 1 - 0
James Tapp 1883 0 - 1
John E Duggan 2177 1 - 0
Martin George 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1766 = (6264 + 400 * (3 - 1)) / 4)

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