Event: u1850 County Championship

Opponent Rating Result
Corinne Mountford 1641 0 - 1
Laureano Garcia 1683 ½ - ½
Colin R Payne 1657 0 - 1
Simon C Jackson 1749 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1583 = (6730 + 400 * (1 - 2)) / 4)

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