Event: Division 3

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Opponent Rating Result
Chris Gribben 1726 1 - 0
Mark Croasdale 1704 ½ - ½
Stephen W Berkley 1784 0 - 1
Greg Billenness 1867 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1870 = (7081 + 400 * (2 - 1)) / 4)

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