Event: A Division

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Opponent Rating Result
Joe Spayne 180 0 - 1
Royce Parker 136 1 - 0
Chris Swales 110 ½ - ½
Stephen W MacCormack 146 ½ - ½
Peter R Archer 107 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

136 = (679 + 400 * (1 - 1)) / 5)

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