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Event: Five Counties Div 1

Opponent Rating Result
U Muhammad Butt 1639 1 - 0
Robert C Nield 1648 1 - 0
Nigel Colter 1741 ½ - ½
Timothy P McMahon 1945 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1843 = (6973 + 400 * (2 - 1)) / 4)

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