Event: Division One

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Opponent Rating Result
Philip Purcell 177 ½ - ½
David Thomson 171 ½ - ½
David J Pritchard 173 0 - 1
Marcus Walsh 173 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

74 = (694 + 400 * (0 - 1)) / 4)

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