Event: Croydon Shield

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Opponent Rating Result
John E Duggan 2113 0 - 1
James Merriman 2193 0 - 1
Mark P Smith 2120 ½ - ½
John Cook 1788 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1854 = (8214 + 400 * (0 - 2)) / 4)

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