Event: Norman Ellis

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Opponent Rating Result
Paul RH Clarke 151 1 - 0
Chris Wright 168 0 - 1
David L Pedro 141 ½ - ½
Peter Braham 148 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

252 = (608 + 400 * (2 - 1)) / 4)

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