Event: u1850 County Championship

Opponent Rating Result
Antony C Hall 1849 ½ - ½
Neil Greenwood 1825 0 - 1
Sean Burton 1823 1 - 0
Antony C Hall 1849 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1837 = (7346 + 400 * (1 - 1)) / 4)

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