Event: Cambs Division 2

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Opponent Rating Result
Peter Barkas 1754 ½ - ½
John D Wright 1567 1 - 0
John Beck 1806 ½ - ½
Jim Jennings 1393 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1830 = (6520 + 400 * (2 - 0)) / 4)

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