Event: Croydon Shield

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Opponent Rating Result
Mehmet Ali 2090 ½ - ½
Martin G Smith 1960 ½ - ½
John P Allen 1923 0 - 1
Liam M Hylands 1968 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1785 = (7941 + 400 * (0 - 2)) / 4)

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