Event: Division One

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Opponent Rating Result
David M Cooper 172 ½ - ½
Gary Boswell 151 0 - 1
Andy Ambrose 144 ½ - ½
Ian Emery 164 1 - 0
John Smith 154 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

157 = (785 + 400 * (1 - 1)) / 5)

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