Event: League

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Opponent Rating Result
Steven Lewis 161 0 - 1
Jason Dew 126 1 - 0
Robert Dennington 114 1 - 0
John P Mainwaring 138 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

235 = (539 + 400 * (2 - 1)) / 4)

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