Event: Open

Opponent Rating Result
Jack Pilley 2094 0 - 1
David J Farrall 1870 1 - 0
Graham J Sharpe 2013 0 - 1
Robert Mitchell 1775 ½ - ½
Andrew J Morley 2093 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1809 = (9845 + 400 * (1 - 3)) / 5)

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