Event: Norman Ellis (Open)

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Opponent Rating Result
Clive W Davies 1875 1 - 0
Paul May 1833 ½ - ½
Warren B Dennison 1953 0 - 1
Randolph E Donahue 1789 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1863 = (7450 + 400 * (1 - 1)) / 4)

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