Event: Margate 100

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Opponent Rating Result
John L Clarke 98 0 - 1
Michael Davies 89 ½ - ½
Roy J McAloney 87 1 - 0
Harry J Sharples 147 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

5 = (421 + 400 * (1 - 2)) / 4)

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