Event: A Division

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Opponent Rating Result
Kevin M Waterman 118 ½ - ½
Alfie McMonagle 123 ½ - ½
Jason Gentle 130 0 - 1
Ron A Stather 133 0 - 1
John Cowle 92 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-41 = (596 + 400 * (0 - 2)) / 5)

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