Event: League

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Opponent Rating Result
Bernard Pratten 146 1 - 0
Mike Dew 110 1 - 0
Joanne Hutchinson 139 ½ - ½
Glyn G Williams 108 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

226 = (503 + 400 * (2 - 1)) / 4)

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