Event: Division One

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Opponent Rating Result
Richard CT Parry 160 ½ - ½
Harry Evans 115 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

338 = (275 + 400 * (1 - 0)) / 2)

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Opponent Rating Result
Tony Preece 138 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

138 = (138 + 400 * (0 - 0)) / 1)