Event: Roger Goldsmith Div 1

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Opponent Rating Result
Robert L Jones 1686 0 - 1
Robert L Jones 1696 ½ - ½
Daniel Finch 1450 0 - 1
Michael Kowalczyk 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1108 = (4832 + 400 * (1 - 2)) / 4)

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