Event: Open

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Opponent Rating Result
John Pitcher 214 0 - 1
Harry Evans 158 1 - 0
David R Thomas 154 1 - 0
Simon C Smith 160 0 - 1
Tony Preece 127 ½ - ½
Richard D Leaper 115 1 - 0
John Pitcher 214 0 - 1
Harry Evans 158 1 - 0
David R Thomas 154 1 - 0
Simon C Smith 160 ½ - ½
Tony Preece 127 ½ - ½
Richard D Leaper 115 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

255 = (1856 + 400 * (6 - 3)) / 12)

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