Event: Norman Ellis

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Opponent Rating Result
Richard Hersey 132 ½ - ½
Paul Howden 140 0 - 1
Paul RH Clarke 151 ½ - ½
Peter Braham 148 ½ - ½
Marcin Skopinski 127 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

140 = (698 + 400 * (1 - 1)) / 5)

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