Event: The Friendly League

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Opponent Rating Result
John Jarmany 2185 0 - 1
Thomas Martin 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

893 = (2185 + 400 * (0 - 1)) / 2)

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Opponent Rating Result
Clive Edwards 0 ½ - ½
David A Talbot 1786 1 - 0
William J Moffatt 1690 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1159 = (3476 + 400 * (1 - 1)) / 3)