Event: Autumn League

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Opponent Rating Result
Dave R Wingrove 1345 1 - 0
David Horton 1225 0 - 1
John CH Jones 1115 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1228 = (3685 + 400 * (1 - 1)) / 3)

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