Event: Doncaster League

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Opponent Rating Result
Peter Convery 153 ½ - ½
Martin S Simmonds 149 ½ - ½
Peter JE Ackley 191 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

164 = (493 + 400 * (0 - 0)) / 3)

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