Event: League Division 3

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Opponent Rating Result
Keith J Riach 1670 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1670 = (1670 + 400 * (0 - 0)) / 1)

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Opponent Rating Result
Philip May 0 1 - 0
Luis Virgos Matilla 1491 0 - 1
Mike Berry 1520 0 - 1
John G Marsh 0 0 - 1
Michael Carrigan 1164 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

755 = (4175 + 400 * (2 - 3)) / 5)