Event: Croydon Shield

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Opponent Rating Result
John E Duggan 2177 ½ - ½
Aivar Jefremov 1874 1 - 0
Brendan Keenan 1960 ½ - ½
Samuel Barlerin 1941 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2088 = (7952 + 400 * (1 - 0)) / 4)

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