Event: League Division 2

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Opponent Rating Result
Zana Aziz 1803 0 - 1
Peter F Mason 1830 0 - 1
Richard Sanger 1679 ½ - ½
David Callaghan 1070 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1496 = (6382 + 400 * (1 - 2)) / 4)

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