Event: u1850 County Championship

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Opponent Rating Result
Armando Galletti 1675 0 - 1
Graeme Jones 1735 ½ - ½
Robert W Stephens 1767 ½ - ½
Michael Osborn 1546 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1481 = (6723 + 400 * (0 - 2)) / 4)

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