Event: League

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Opponent Rating Result
David G Mills 135 ½ - ½
Keith Noons 102 ½ - ½
John P Mainwaring 136 1 - 0
Keith Noons 102 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

219 = (475 + 400 * (1 - 0)) / 4)

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