Event: Division 2

Opponent Rating Result
Stephen M Williams 1890 1 - 0
John M Guilfoyle 1914 1 - 0
John W Waterfield 2011 1 - 0
David O Vaughan 1822 1 - 0
Philip HC Nendick 2013 0 - 1
Stephen M Williams 1861 1 - 0
John M Guilfoyle 1933 0 - 1
David O Vaughan 1804 0 - 1
George I Miller 1956 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1956 = (17204 + 400 * (5 - 4)) / 9)

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